SEALED COBALT REMOVAL DEVICE, METHOD, ASSEMBLY EQUIPMENT, AND POLYCRYSTALLINE DIAMOND COMPACT

Description

TECHNICAL FIELD

The present application relates to the technical field of cobalt removal, and in particular to a sealed cobalt removal device, method, assembly equipment, and polycrystalline diamond compact.

BACKGROUND

As a key working component for crude oil and natural gas extraction, and as a material that directly undergoes shearing and crushing actions with rock structures, polycrystalline diamond composite materials play a decisive role in the drilling efficiency of the overall drill bit. Due to the extreme properties of underground drilling conditions, the polycrystalline diamond composite layer is required to have the best material properties to achieve the mining task, including extremely high hardness, toughness and thermal stability.

Since polycrystalline diamond compact (PDC) is an ultra-hard composite material used for oil and gas drilling and mineral extraction, removing cobalt from the diamond layer is necessary to enhance wear resistance and impact strength. However, when the existing cobalt removal device for the compact is sealed for cobalt removal, the cobalt removal reagent (i.e., the acid solution required for cobalt removal) is blocked by a sealing ring, so that the acid solution only contacts the layer to be subjected to cobalt removal of the compact. However, some acid solution may still penetrate the sealing ring, and the acid isolation performance is poor, thereby causing a certain degree of corrosion on the surface of the alloy portion of the compact, requiring further grinding to meet product surface specifications. Consequently, the final compact has lower quality, and a shorter service life.

SUMMARY

A primary objective of the present application is to provide a sealed cobalt removal device, method, assembly equipment, and a polycrystalline diamond compact, aiming to solve the technical problem that the existing diamond compact cobalt removal device has poor isolation performance against the cobalt removal reagent, resulting in low surface quality of the final diamond compact.

In order to achieve the above objective, the present application provides a sealed cobalt removal device, including an enclosing mechanism, a clamping mechanism, a composite sealing ring and a containing mechanism. The clamping mechanism is provided in the enclosing mechanism, and the clamping mechanism is configured to clamp a workpiece to be subjected to cobalt removal, wherein the workpiece to be subjected to cobalt removal includes a substrate and a composite layer connected to a top of the substrate. The composite sealing ring is embedded in a top of the clamping mechanism, the composite sealing ring is sleeved around the workpiece to be subjected to cobalt removal, the composite sealing ring includes a first sealing body and a second sealing body embedded in an inner side wall of the first sealing body, and the second sealing body is sleeved around an outer wall of the composite layer or at a junction between the composite layer and the substrate, the first sealing body is configured to block a cobalt removal reagent, and a material of the second sealing body is a material that can react or not react with the cobalt removal reagent. The containing mechanism is provided in the enclosing mechanism, a bottom of the containing mechanism is pressed tightly against a top surface of the first sealing body, the containing mechanism is provided with an inner cavity for containing the cobalt removal reagent, and the inner cavity is communicated with a top surface of the composite layer.

Optionally, a barrier assembly is provided inside the inner cavity, and a bottom of the barrier assembly is pressed tightly against a partial area of the top surface of the composite layer, so that an exposed area of the top surface of the composite layer forms a reaction area in contact with the cobalt removal reagent.

Optionally, the barrier assembly includes a pressing column and an isolation sleeve. A top of the pressing column is pressed against an inner top of the inner cavity. An isolation sleeve, wherein the isolation sleeve is provided at a bottom of the pressing column, and the isolation sleeve is fitted against a partial area of the top surface of the composite layer.

Optionally, a positioning assembly is sleeved around an outer wall of the pressing column. The positioning assembly includes a plurality of positioning blocks connected to the outer wall of the pressing column, the positioning blocks are all fitted against an inner wall of the inner cavity, and adjacent positioning blocks are arranged at intervals.

Optionally, an outer wall of the positioning block is provided with an external thread, and the inner wall of the inner cavity is provided with an internal thread that engages with the external thread.

Optionally, the containing mechanism includes a bearing block and a sealing cover. The inner cavity is formed in the bearing block, and the bottom of the bearing block is pressed tightly against the top surface of the first sealing body. The sealing cover is detachably connected to the top of the bearing block.

Optionally, the enclosing mechanism includes a base, a pressing sleeve and an enclosing cover. A receiving cavity with a top opening is formed in the base, and the clamping mechanism is located at an inner bottom of the receiving cavity. The pressing sleeve is a hollow structure, a lower section of the pressing sleeve is threadedly sleeved around an outer wall of the base, and an upper section of the pressing sleeve is sleeved around an outer wall of the bearing block. The enclosing cover is threadedly sleeved around an outer wall of the pressing sleeve, so that the enclosing cover is pressed tightly against the top of the sealing cover.

Optionally, a limiting step is provided on the outer wall of the bearing block, and a pressing boss that mates with the limiting step is provided in the pressing sleeve.

Optionally, the clamping mechanism includes at least two clamping blocks that are detachably connected, an inner wall of the clamping block is provided with a clamping groove for clamping the workpiece to be subjected to cobalt removal, and a top of the clamping block is provided with a step groove for embedding the composite sealing ring.

Optionally, the top surface of the workpiece to be subjected to cobalt removal is protruding relative to the top surface of the first sealing body, and a protruding height is H, H=600-800 μm.

To achieve the above objective, the present application further provides a cobalt removal method, based on the above-mentioned sealed cobalt removal device, including the following steps:

• • clamping the workpiece to be subjected to cobalt removal in the sealed cobalt removal device through the clamping mechanism, and enclosing the sealed cobalt removal device;
  • heating the enclosed sealed cobalt removal device at a heating temperature of 50-350° C.;
  • taking out the heated sealed cobalt removal device, and cooling the heated sealed cobalt removal device to room temperature;
  • disassembling the enclosing cover and the sealing cover, to pour out the cobalt removal reagent in the inner cavity; and
  • continuing to disassemble the pressing sleeve, the bearing block, the barrier assembly, and the clamping mechanism, to take out the workpiece subjected to cobalt removal.

Optionally, clamping the workpiece to be subjected to cobalt removal in the sealed cobalt removal device through the clamping mechanism, and enclosing the sealed cobalt removal device includes:

• • pre-clamping the workpiece to be subjected to cobalt removal through the clamping mechanism, and installing the composite sealing ring on the top of the clamping mechanism, so that the composite sealing ring is sleeved around the workpiece to be subjected to cobalt removal;
  • placing the clamping mechanism with the workpiece to be subjected to cobalt removal clamped as a whole at an inner bottom of the receiving cavity of the base;
  • installing the bearing block, so that the bottom of the bearing block is pressed against the top surface of the first sealing body;
  • installing the pressing sleeve, so that the pressing sleeve is pressed against the bearing block;
  • installing the barrier assembly in the inner cavity of the bearing block, so that the bottom of the barrier assembly is pressed against a partial area of the top surface of the composite layer;
  • adding an appropriate amount of cobalt removal reagent into the inner cavity;
  • installing the sealing cover on the top of the bearing block, so that the inner cavity forms a sealed cavity; and
  • installing the enclosing cover to press the sealing cover tightly, thereby completing the enclosing of the cobalt removal device.

To achieve the above objective, the present application further provides an assembly equipment, configured to assemble the above-mentioned sealed cobalt removal device, including a workbench, where a first assembly mechanism, an acid injection mechanism, a capping mechanism, and a second assembly mechanism are provided on the workbench, and a first industrial robotic arm and a second industrial robotic arm are provided on both sides of the workbench respectively. The first industrial robotic arm is configured to clamp the pressing sleeve and pre-install the pressing sleeve on the pre-assembly tooling, to obtain a semi-finished tooling. The pre-assembly tooling is located on the workbench, and the pre-assembly tooling is a tooling that is configured to pre-install the clamping mechanism, the composite sealing ring, the workpiece to be subjected to cobalt removal and the bearing block in the base. The first assembly mechanism is configured to tighten the pressing sleeve to the outer wall of the base. The acid injection mechanism is configured to inject the cobalt removal reagent into an inner cavity of the semi-finished tooling. The capping mechanism is configured to press the sealing cover to the top of the bearing block of the semi-finished tooling after the cobalt removal reagent is injected, to obtain a sealing tooling. The second industrial robotic arm is configured to clamp the enclosing cover and pre-install the enclosing cover on the pressing sleeve of the sealing tooling. And the second assembly mechanism is configured to tighten the enclosing cover to the outer wall of the pressing sleeve, thereby finally obtaining a sealed cobalt removal device.

Optionally, the assembly equipment further includes a first transport mechanism, a second transport mechanism and a transfer mechanism. The first transport mechanism is configured to move the semi-finished tooling in sequence along workstations corresponding to the first industrial robotic arm, the first assembly mechanism, the acid injection mechanism, and the capping mechanism. The second transport mechanism is configured to move the sealing tooling to a workstation corresponding to the second assembly mechanism. And the transfer mechanism is configured to transfer the sealing tooling from the first transport mechanism to the second transport mechanism.

Optionally, the first transport mechanism includes a fixing frame, a mobile platform, a first driving mechanism, a first telescopic mechanism, a lifting platform, and at least one first mechanical gripper. The fixing frame is provided at the bottom of the workbench. The mobile platform is slidably arranged on the fixing frame. The first driving mechanism is provided on the fixing frame, and configured to drive the mobile platform to slide laterally on the fixing frame. The first telescopic mechanism is provided at the bottom of the mobile platform, and a telescopic end of the first telescopic mechanism movably extends through the mobile platform. The lifting platform is provided at the top of the first telescopic mechanism. The first mechanical gripper is provided at a top of the lifting platform, the first mechanical gripper is configured to clamp the pre-assembled tooling and/or the semi-finished tooling, and a strip-shaped groove for the first mechanical gripper to pass through is formed on the workbench, the strip-shaped groove is parallel to a sliding direction of the mobile platform, and the strip-shaped groove spans the workstations corresponding to the first industrial robotic arm, the first assembly mechanism, the acid injection mechanism and the capping mechanism.

Optionally, the transfer mechanism includes a support frame, a second telescopic mechanism, a second mechanical gripper, and a second driving mechanism. The support frame is provided on the workbench, and located between the first transport mechanism and the second transport mechanism. The second telescopic mechanism is slidably arranged on the support frame. The second mechanical gripper is provided at the bottom of the second telescopic mechanism, and configured to clamp the sealing tool. The second driving mechanism is provided on the support frame, and configured to drive the second telescopic mechanism to slide laterally on the support frame.

Optionally, at least one set of positioning seats are provided at workstations corresponding to the first industrial robotic arm, the first assembly mechanism, the acid injection mechanism, the capping mechanism, the transfer mechanism, the second assembly mechanism, and the second industrial robotic arm on the workbench. The positioning seats are configured to place the semi-finished tooling or the sealing tooling, and the positioning seats are provided along both sides of the strip-shaped groove.

Optionally, the first assembly mechanism includes a support arm, a rotation driving mechanism, a third driving mechanism, and a twisting sleeve. The support arm is provided on the workbench. The rotation driving mechanism is slidably provided on the support arm. The third driving mechanism is configured to drive the rotation driving mechanism to slide vertically along the support arm. And the twisting sleeve is connected to a bottom of the rotation driving mechanism, and configured to tighten the pressing sleeve to the outer wall of the base.

Optionally, the acid injection mechanism includes a first lifting mechanism, a pump body, and an acid injection tube. The first lifting mechanism is provided on the workbench. The pump body is provided on the first lifting mechanism, allowing the pump body to move up and down, and configured to deliver the cobalt removal reagent. And the acid injection tube is connected to the pump body, and configured to inject the cobalt removal reagent into the inner cavity of the semi-finished tooling.

Optionally, a smoke hood is provided on the workbench, and through-slots for allowing the semi-finished tooling to pass through are formed on both sides of the smoke hood, the acid injection tube movably extends through the smoke hood, and a smoke exhaust pipe is provided on a top of the smoke hood.

Optionally, the capping mechanism includes a second lifting mechanism, a movable arm, and a pressing rod. The second lifting mechanism is provided on the workbench. The movable arm is provided on the second lifting mechanism, allowing the movable arm to move up and down, and the movable arm moves through the smoke hood. And the pressing rod is connected to the bottom of the movable arm, and configured to press the sealing cover against the top of the bearing block of the semi-finished tooling.

The present application further provides a polycrystalline diamond compact, which is produced based on the above-mentioned sealed cobalt removal device. The polycrystalline diamond compact includes the substrate. The composite layer is connected to the top of the substrate, the composite layer includes a layer not subjected to cobalt removal connected to the top of the substrate, and an annular layer subjected to cobalt removal is sleeved around a periphery of the layer not subjected to cobalt removal.

Optionally, assuming an edge cobalt removal depth of the annular layer subjected to cobalt removal is h1, a range of h1 is: h/2≤h1≤9h/10; where h is a thickness of the composite layer.

Optionally, assuming a radial distance between an outer edge of a top surface of the annular layer subjected to cobalt removal and an outer edge of a top surface of the layer not subjected to cobalt removal is a, a range of a is: 3000≤a≤5000 μm.

Optionally, the annular layer subjected to cobalt removal is divided into an edge removal area and a surface removal area according to various depths, the surface removal area is close to the layer not subjected to cobalt removal, the edge removal area is located on the periphery of the surface removal area, the depth of the edge removal area is greater than the depth of the surface removal area, and assuming that a radial width of the surface removal area is a1, a range of a1 is: 0<a1≤2000 μm.

Optionally, a shape of a top surface of the layer not subjected to cobalt removal is a regular shape or an irregular shape.

The beneficial effects that can be achieved by the present application are as follows.

When the workpiece to be subjected to cobalt removal is installed for cobalt removal, the cobalt removal reagent in the inner cavity contacts the top surface of the composite layer. At the same time, under high temperature and high pressure conditions, the cobalt removal reagent gradually penetrates the composite layer to perform cobalt removal. During this process, the first sealing body in the composite sealing ring can block most of the cobalt removal reagent, to prevent the cobalt removal reagent from corroding the outer wall of the workpiece to be subjected to cobalt removal. When a small amount of acid gas formed under high temperature and high pressure conditions penetrates the first sealing body, the second sealing body can block the acid gas, or react with the acid gas of this amount of the cobalt removal reagent, thereby consuming this amount of the cobalt removal reagent, which can effectively block the acid gas of the cobalt removal reagent from penetrating into the alloy portion of the workpiece to be subjected to cobalt removal (i.e., the substrate part that does not need cobalt removal). Therefore, the present application improves the isolation performance against the cobalt removal reagent by optimizing the design of the composite sealing ring, thereby playing a good protective role, which not only ensures the cobalt removal effect, but also improves the surface quality of the produced diamond compact.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of specific embodiments or prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. The elements or parts in the drawings are not necessarily drawn according to the actual scale.

FIG. 1 is a schematic structural diagram of a sealed cobalt removal device according to an embodiment of the present application.

FIG. 2 is a schematic diagram of an assembly structure of a workpiece to be subjected to cobalt removal and a composite sealing ring according to the embodiment of the present application.

FIG. 3 is a schematic structural diagram of a clamping mechanism according to the embodiment of the present application (top view).

FIG. 4 is a schematic diagram of a connection structure of a pressing column and a positioning block according to the embodiment of the present application (top view).

FIG. 5 is a schematic diagram of a fitting structure of a bearing block and a pressing sleeve according to the embodiment of the present application.

FIG. 6 is a schematic diagram of a three-dimensional structure of an assembly equipment according to the embodiment of the present application.

FIG. 7 is a schematic structural diagram of a front view of the assembly equipment according to the embodiment of the present application.

FIG. 8 is a schematic diagram of a fitting structure of a first industrial robotic arm and a first assembly mechanism according to the embodiment of the present application.

FIG. 9 is a schematic diagram of a connection structure of a first transport mechanism and a workbench according to the embodiment of the present application.

FIG. 10 is a schematic diagram of the connection structure of the first transport mechanism and the workbench in another perspective according to the embodiment of the present application.

FIG. 11 is a schematic diagram of an integrated structure of components such as an acid injection mechanism and a capping mechanism according to the embodiment of the present application.

FIG. 12 is a schematic structural diagram of a transfer mechanism according to the embodiment of the present application.

FIG. 13 is a schematic structural diagram of a polycrystalline diamond compact according to the embodiment of the present application.

The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings.

DETAILED DESCRIPTION OF THE EMBODIMENTS

The technical solutions of the embodiments of the present application will be described clearly and thoroughly below with reference to the accompanying drawings. It is obvious that the described embodiments are only some rather than all of the embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative efforts shall fall within the scope of the present application.

It should be noted that the directional indicators (such as up, down, left, right, front, back, etc.) involved in the embodiments of the present application are solely used to explain the relative positional relationships, movements, etc. between the components in a specific orientation. If the specific orientation changes, the directional indicators will change accordingly.

In the present application, unless otherwise explicitly specified and limited, the terms “connection” and “fixing” should be understood in a broad sense. For example, “connection” can be a fixed connection, a detachable connection, or as being integrated; it can be a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium, and it can refer to an internal connection between two components or an interaction between two components, unless explicitly defined otherwise. The specific meaning of the above terms in the present application may be understood by those skilled in the art in accordance with specific conditions.

In addition, if there are descriptions related to “first”, “second”, etc. in the embodiments of the present application, the descriptions of “first”, “second”, etc. are solely for illustrative purposes, and should not be construed as indicating or implying relative importance or implicitly indicates the quantity of technical features indicated. Thus, a feature defined as “first”, “second” may expressly or implicitly include at least one of that feature. Besides, the meaning of “and/or” appearing in the application includes three parallel solutions. For example, “A and/or B” includes solution A, or solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but must be based on the realization by those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of such technical solutions does not exist or falls within the scope of protection claimed in the present application.

Embodiment 1

Referring to FIGS. 1 to 5, the embodiment provides a sealed cobalt removal device, including an enclosing mechanism 110, a clamping mechanism 120, a composite sealing ring 130, and a containing mechanism 140. The clamping mechanism 120 is provided in the enclosing mechanism 110, and the clamping mechanism 120 is configured to clamp the workpiece to be subjected to cobalt removal. The workpiece to be subjected to cobalt removal includes a substrate 161 and a composite layer 162 connected to the top of the substrate 161. The composite sealing ring 130 is embedded in the top of the clamping mechanism 120, and the composite sealing ring 130 is sleeved around the workpiece to be subjected to cobalt removal. The composite sealing ring 130 includes a first sealing body 131 and a second sealing body 132 embedded in an inner side wall of the first sealing body 131. The second sealing body 132 is sleeved around the outer wall of the composite layer 162 or at the junction between the composite layer 162 and the substrate 161. The first sealing body 131 is used to block the cobalt removal reagent. A material of the second sealing body 132 is a material that can react or not react with the cobalt removal reagent. The containing mechanism 140 is provided in the enclosing mechanism 110. The bottom of the containing mechanism 140 is pressed tightly against the top surface of the first sealing body 131. The containing mechanism 140 is provided with an inner cavity for containing the cobalt removal reagent, and the inner cavity is communicated with the top surface of the composite layer 162.

In the prior art, when cobalt removal is carried out on compact products, due to the use of a high-temperature sealing structure, during the cobalt removal process of the product, because of the high temperature and high pressure conditions, the acid gas molecules formed by a small amount of cobalt removal reagent (acidic chemical reagent) can penetrate the sealing structure, thereby causing slight corrosion on the surface of the hard alloy compact, and grinding is required to meet the product surface requirements. Furthermore, the higher the temperature and pressure, the more severe the surface corrosion. However, reducing the temperature and pressure leads to a decrease in the effectiveness of cobalt removal.

Therefore, in this embodiment, when the workpiece to be subjected to cobalt removal is installed for cobalt removal, the cobalt removal reagent in the inner cavity contacts the top surface of the composite layer 162. At the same time, under high temperature and high pressure conditions, the cobalt removal reagent gradually penetrates the composite layer 162 to perform cobalt removal. During this process, the first sealing body 131 in the composite sealing ring 130 can block most of the cobalt removal reagent, to prevent the cobalt removal reagent from corroding the outer wall of the workpiece to be subjected to cobalt removal. When a small amount of acid gas formed under high temperature and high pressure conditions penetrates the first sealing body 131, the second sealing body 132 can block the acid gas (when the material of the second sealing body 132 does not react with the cobalt removal reagent), or the second sealing body 132 can react with the acid gas of this amount of the cobalt removal reagent, thereby consuming this amount of the cobalt removal reagent, which can effectively block the acid gas of the cobalt removal reagent from penetrating into the alloy portion of the workpiece to be subjected to cobalt removal (that is, the substrate 161 part that does not require cobalt removal). Therefore, this embodiment improves the isolation performance against the cobalt removal reagent through the optimized design of the composite sealing ring 130, thereby playing a good protective role. And because the present embodiment greatly reduces the corrosive effect of the cobalt removal reagent to the outer wall of the workpiece to be subjected to cobalt removal, the temperature can be further increased to above 250° C. under the existing cobalt removal process conditions, thereby further improving the cobalt removal effect and improving the quality of the obtained diamond compact.

It should be noted that the material of the first sealing body 131 is a sealing material, such as plastic. The second sealing body 132 can be made of metal materials, and any material that can consume the acid gas of the cobalt removal reagent can be used. Since the upper end of the inner wall of the metal material contacts the composite layer 162, it blocks the first sealing body 131 and the hard alloy at the lower end of the product. Since very little acid gas passes through the molecular gap of the composite sealing ring 130 and directly contacts the second sealing body 132 of the metal material, the metal material consumes this amount of the acid gas, thereby protecting the hard alloy and preventing the product from being corroded. The composite sealing ring 130 can have a structure with a gradually decreasing outer diameter from top to bottom, forming a conical surface structure, which can improve the radial pressing reliability when the composite sealing ring 130 is pressed downward.

In addition, the above-mentioned cobalt removal reagent can be in a gaseous or liquid state. If it is in a liquid state, the cobalt removal reagent includes 24-48 parts of hydrofluoric acid, 24-30 parts of nitric acid, and 32-40 parts of distilled water by mass, which meets the requirements for the cobalt removal process. If it is in a gaseous state, the above-mentioned liquid cobalt removal reagent can be evaporated into gas at high temperature.

By comparing the compacts produced using a traditional sealing ring and the composite sealing ring under different process conditions, the comparison results are shown in Table 1 below.

TABLE 1
Experimental comparison results table

					Diameter	Diameter
					before	after
Temperature	Cobalt removal		Surface depth	Edge depth	grinding	grinding	Corrosion
(° C.)	time (h)	Sealing ring	(μm)	(μm)	(mm)	(mm)	degree

160	384	Ordinary	1050	1440-1460	13.450	13.440	None
		sealing ring
		Composite	830	1570-1660	13.455	13.450	None
		sealing ring
200	192	Ordinary	1120-1180	1500-1680	13.455	13.335	Slightly
		sealing ring					corroded
		Composite	1290-1320	1850-1910	13.460	13.455	None
		sealing ring
240	96	Ordinary	980	1410-1410	13.450	13.400	Corroded
		sealing ring
		Composite	1040-1070	1400-1570	13.450	13.440	None
		sealing ring

As shown in Table 1, as the temperature increases, the cobalt removal effect improves (i.e., the edge depth increases). If a traditional sealing ring is used, the higher the temperature, the higher the corrosion degree of the final compact, which leads to a higher grinding degree and a smaller diameter of the compact after grinding, affecting the product specification and quality. However, after using the composite sealing ring of this embodiment, there is basically no corrosion, and only surface polishing and grinding are required. The grinding degree is very low, and the diameter of the compact after grinding is relatively large, which improves the product specification and quality.

As an optional embodiment, the inner wall of the inner cavity is provided with a corrosion-resistant layer. The material for the corrosion-resistant layer includes one or more of fluorine-containing plastic, resin, metal, metal oxide or nitride, non-metal, and non-metal oxide or nitride, thereby improving the corrosion resistance of the inner cavity.

Due to the sealing structure based on the composite sealing ring 130, a diamond compact with a higher cobalt removal depth can be finally produced, the better the wear resistance, but the toughness of the diamond compact decreases accordingly. Therefore, as an optional embodiment, a barrier assembly 150 is provided inside the inner cavity, and the bottom of the barrier assembly 150 is pressed tightly against a partial area of the top surface of the composite layer 162, so that the exposed area of the top surface of the composite layer 162 is the reaction area in contact with the cobalt removal reagent.

In this embodiment, the barrier assembly 150 can be used to press tightly against a partial area of the top surface of the composite layer 162, thereby exposing only the reaction area on the top surface of the composite layer 162. When the cobalt removal reagent is introduced into the inner cavity, the cobalt removal reagent basically only contacts the reaction area. For example, the reaction area is designed as an annular area, and an annular cobalt removal structure can be formed. In other embodiments, the reaction area here can also be an irregular or regular non-annular area, thereby forming a layer subjected to cobalt removal with a unique structure, to meet special use requirements. Since the grinding part of the diamond compact is mainly the edge area, finally a layer subjected to cobalt removal (i.e., the grinding part) at the edge area of the top of the composite layer 162 is formed through the barrier component 150 in this embodiment. While the middle part of the composite layer 162 is a layer not subjected to cobalt removal, thereby increasing the toughness of the middle part of the composite layer 162, improving the overall toughness of the diamond compact, and extending its service life. Through the synergistic effect of the barrier component 150 and the composite sealing ring 130, a high-quality diamond compact can be finally produced.

As an optional embodiment, the barrier assembly 150 includes a pressing column 151 and an isolation sleeve 152. The top of the pressing column 151 is pressed tightly against the inner top of the inner cavity. The isolation sleeve 152 is arranged at the bottom of the pressing column 151, and the isolation sleeve 152 is fitted against a partial area of the top surface of the composite layer 162.

In this embodiment, the pressing column 151 can generate a pressing force on the top surface of the composite layer 162. The isolation sleeve 152 transmits the pressing force, so that the isolation sleeve 152 can be tightly pressed on the top surface of the composite layer 162, that is, the isolation sleeve 152 can resist most of the erosion from the cobalt removal reagent, and a certain area not subjected to cobalt removal can be formed on the top surface of the composite layer 162 by shielding from the isolation sleeve 152, so as to obtain a diamond compact with an annular cobalt removal structure.

It should be noted that the isolation sleeve 152 and the pressing column 151 can adopt a threaded connection structure, facilitating assembly and disassembly. By using the combination of the isolation sleeve 152 and the pressing column 151, the isolation sleeve 152 and the pressing column 151 with corresponding shapes can be selected to assemble according to the required shape of the reaction area to be formed. In this way, the isolation sleeve 152 with the corresponding shape structure can cover a partial area of the top surface of the composite layer 162, leaving the required reaction area exposed. This design improves the utilization rate of the barrier assembly 150, making it more flexible to use.

As an optional embodiment, a positioning assembly is sleeved around an outer wall of the pressing column 151. The positioning assembly includes a plurality of positioning blocks 153 connected to the outer wall of the pressing column 151. The positioning blocks 153 are all fitted against the inner wall of the inner cavity, and adjacent positioning blocks 153 are arranged at intervals.

In this embodiment, during installation, the pressing column 151 is placed in the inner cavity. At this time, with the plurality of positioning blocks 153 being fitted against to the inner wall of the inner cavity, this ensures that the isolation sleeve 152 at the bottom of the pressing column 151 can be positioned and fitted to the corresponding position on the top surface of the composite layer 162, achieving positioning installation. The adjacent positioning blocks 153 are arranged at intervals to form gaps, which allow the cobalt removal reagent added to the inner cavity to pass through smoothly.

As an optional embodiment, the outer wall of the positioning block 153 is provided with an external thread, and the inner wall of the inner cavity is provided with an internal thread that engages with the external thread.

In this embodiment, since the barrier assembly 150 needs to be installed first, and then the cobalt removal reagent is added, the barrier assembly 150 basically relies on its own gravity to be pressed tightly on the top surface of the composite layer 162 after installation, and the anti-penetration effect against the cobalt removal reagent is relatively poor. Therefore, by forming a threaded connection between the positioning block 153 and the inner wall of the inner cavity, the pressing column 151 can be screwed into the inner cavity, so that the positioning block 153 is threadedly connected with the inner wall of the inner cavity. By using the threaded self-locking effect of the positioning block 153 and the inner wall of the inner cavity, the isolation sleeve 152 can be pressed tightly on the top surface of the composite layer 162, which plays a temporary pressing role, reducing the possibility of the cobalt removal reagent seeping the gap between the isolation sleeve 152 and the top surface of the composite layer 162, thereby further promoting the formation of the annular cobalt removal structure.

As an optional embodiment, the containing mechanism 140 includes a bearing block 141 and a sealing cover 142. The inner cavity is formed in the bearing block 141, and the bottom of the bearing block 141 is pressed against the top surface of the first sealing body 131. And the sealing cover 142 is detachably connected to the top of the bearing block 141.

In this embodiment, during assembly, firstly the bearing block 141 is pressed against the top surface of the first sealing body 131, then the barrier assembly 150 is installed in the inner cavity of the bearing block 141, and afterwards the sealing cover 142 is installed on the top of the bearing block 141. At this time, the sealing cover 142 can exert a pressing force on the barrier assembly 150, so that the barrier assembly 150 is pressed firmly against the top surface of the composite layer 162, and finally the inner cavity forms a sealed cavity, facilitating the subsequent cobalt removal process under high temperature.

As an optional embodiment, the enclosing mechanism 110 includes a base 111, a pressing sleeve 112, and an enclosing cover 113. The base 111 is provided with a receiving cavity with a top opening, and the clamping mechanism 120 is located at the inner bottom of the receiving cavity. The pressing sleeve 112 is a hollow structure, the lower section of the pressing sleeve 112 is threadedly sleeved around the outer wall of the base 111, and the upper section of the pressing sleeve 112 is sleeved around the outer wall of the bearing block 141. The enclosing cover 113 is threadedly sleeved around the outer wall of the pressing sleeve 112, so that the enclosing cover 113 is pressed tightly against the top of the sealing cover 142. The outer wall of the bearing block 141 is provided with a limiting step 1411, and the pressing sleeve 112 is provided with a pressing boss 1121 that mates with the limiting step 1411.

In this embodiment, after the assembly of the containing mechanism 140 (with the cobalt removal reagent added) is completed, the pressing sleeve 112 is threadedly sleeved around the outer wall of the base 111 and tightened, so that the pressing boss 1121 applies a pressing force on the limiting step 1411, thereby exerting a pressing force on the entire bearing block 141, so that the bearing block 141 can be tightly pressed on the top surface of the first sealing body 131, ensuring the sealing effect. And finally, the enclosing cover 113 is threadedly sleeved around the outer wall of the pressing sleeve 112, after screwing tightly, the sealing cover 142 is presses tightly, ultimately forming a reliably sealed cobalt removal device.

As an optional embodiment, the clamping mechanism 120 includes at least two detachably connected clamping blocks, the inner wall of the clamping block is provided with a clamping groove 121 for clamping the workpiece to be subjected to cobalt removal, and the top of the clamping block is provided with a step groove 122 for embedding the composite sealing ring 130.

In this embodiment, generally, two clamping blocks are sufficient, and the two clamping blocks can be connected together by bolts, that is, a detachable connection is achieved. This ensures a tight fit between the composite sealing ring 130 and the workpiece to be subjected to cobalt removal, playing a crucial role in protecting the hard alloy of the workpiece to be subjected to cobalt removal. The clamping force is also adjustable (i.e., the radial pressure is adjustable), and different radial pressures can meet different cobalt removal processes. This significantly enhances the pressure inside the inner cavity during the cobalt removal process without causing corrosion to the alloy portion of the workpiece to be subjected to cobalt removal.

It should be noted that the workpiece to be subjected to cobalt removal is generally cylindrical, thus the clamping block can be an arc block. In some special cases, the workpiece to be subjected to cobalt removal can also be a structure with a sector-shaped, polygonal or other irregular cross section. The composite sealing ring 130 can be matched to the workpiece to be subjected to cobalt removal according to its corresponding shape. The clamping block is also designed with a clamping groove 121 of the corresponding shape. The structure of other parts can remain unchanged. As only the composite sealing ring 130 and the clamping mechanism 120 need to be adapted to the shape of the workpiece to be subjected to cobalt removal, which has a certain versatility.

As an optional embodiment, the top surface of the workpiece to be subjected to cobalt removal is protruding relative to the top surface of the first sealing body 131. The protruding height is H, H=600-800 μm. The protruding height after the workpiece to be subjected to cobalt removal is sealed and installed is the portion to be subjected to cobalt removal. The boundary surface inclination angle a is related to the protruding height H. With this protruding height H, the requirement that the boundary surface inclination angle a between the layer subjected to cobalt removal and the layer not subjected to cobalt removal of the prepared workpiece is less than 45° can be met.

Embodiment 2

Referring to FIGS. 1 to 5, this embodiment provides a cobalt removal method based on the above-mentioned sealed cobalt removal device, including the following steps:

• • clamping the workpiece to be subjected to cobalt removal in the sealed cobalt removal device through the clamping mechanism 120, and enclosing the sealed cobalt removal device;
  • heating the enclosed sealed cobalt removal device at a heating temperature of 50-350° C.;
  • taking out the heated sealed cobalt removal device, and cooling the heated sealed cobalt removal device to room temperature;
  • disassembling the enclosing cover 113 and the sealing cover 142, to pour out the cobalt removal reagent in the inner cavity; and
  • continuing to disassemble the pressing sleeve 112, the bearing block 141, the barrier assembly 150, and the clamping mechanism 120, to take out the workpiece subjected to cobalt removal.

In this embodiment, during cobalt removal, firstly the workpiece to be subjected to cobalt removal is clamped in the sealed cobalt removal device through the clamping mechanism 120, to complete the enclosing operation; and then the entire sealed cobalt removal device is heated to increase the pressure in the inner cavity, to promote the cobalt removal reagent in the inner cavity to penetrate the top of the workpiece to be subjected to cobalt removal, thereby realizing the cobalt removal process; afterwards, the sealed cobalt removal device is cooled to room temperature; the enclosing cover 113 and the sealing cover 142 are sequentially removed, the cobalt removal reagent is then poured out, followed by the removal of components such as the pressing sleeve 112, the bearing block 141, the barrier assembly 150, and the clamping mechanism 120. Finally, the workpiece subjected to cobalt removal can be retrieved.

It should be noted that the above-mentioned heating method can be at least one of water bath, oil bath, gas bath, microwave heating, resistance wire heating, oven heating, electromagnetic induction heating, or infrared heating. After pouring out the cobalt removal reagent in the inner cavity, the residual cobalt removal reagent in the cavity needs to be repeatedly rinsed with clean water. Timely cleaning of the inner cavity can reduce the corrosion of the cobalt removal reagent, preparing it for the next use. Before taking out the workpiece subjected to cobalt removal, the workpiece subjected to cobalt removal needs to be ultrasonically cleaned, and then the cleaned workpiece is dried. Ultrasonic cleaning can wash out the cobalt removal reagent in the gaps of the sealed cobalt removal device, to prevent the cobalt removal reagent from contacting and corroding the metal alloy substrate 161 of the workpiece when the workpiece is removed. Then, drying the workpiece can completely volatilize the residual cobalt removal reagent.

As an optional embodiment, clamping the workpiece to be subjected to cobalt removal in the sealed cobalt removal device through the clamping mechanism 120, and enclosing the sealed cobalt removal device, includes:

• • pre-clamping the workpiece to be subjected to cobalt removal through the clamping mechanism 120, and installing the composite sealing ring 130 on the top of the clamping mechanism 120, so that the composite sealing ring 130 is sleeved around the workpiece to be subjected to cobalt removal;
  • placing the clamping mechanism 120 with the workpiece to be subjected to cobalt removal clamped therein as a whole at the inner bottom of the receiving cavity of the base 111;
  • installing the bearing block 141, so that the bottom of the bearing block 141 is pressed tightly against the top surface of the first sealing body 131;
  • installing the pressing sleeve 112, so that the pressing sleeve 112 presses against the bearing block 141;
  • installing the barrier assembly 150 in the inner cavity of the bearing block 141, so that the bottom of the barrier assembly 150 is pressed against a partial area of the top surface of the composite layer 162;
  • adding an appropriate amount of cobalt removal reagent into the inner cavity;
  • installing the sealing cover 142 on the top of the bearing block 141, so that the inner cavity forms a sealed cavity; and
  • installing the enclosing cover 113, to press the sealing cover 142 tightly, thereby completing the enclosing of the sealed cobalt removal device.

In this embodiment, when enclosing the workpiece to be subjected to cobalt removal, firstly the workpiece to be subjected to cobalt removal is pre-clamped through the clamping mechanism 120, and the composite sealing ring 130 is installed on the top of the clamping mechanism 120. Then the clamping mechanism 120 with the clamped workpiece to be subjected to cobalt removal clamped as a whole is placed at the inner bottom of the receiving cavity of the base 111. Afterwards, the bearing block 141, the pressing sleeve 112 and the barrier assembly 150 are installed in sequence. By using the barrier assembly 150, a partial area of the top surface of the workpiece to be subjected to cobalt removal is shielded. Subsequently when an appropriate amount of cobalt removal reagent is added, the reagent only contacts the exposed annular area on the top surface of the workpiece to be subjected to cobalt removal. Then, the sealing cover 142 and the enclosing cover 113 are sequentially installed, completing the enclosing of the cobalt removal device. As a result, a compact with an annular cobalt removal structure can be produced.

As an optional embodiment, during the step of adding the appropriate amount of cobalt removal reagent into the inner cavity, the amount of the cobalt removal reagent added is ⅕ to ⅘ of the volume of the inner cavity. Since the cobalt removal reagent contains volatile chemical components and water, during the heating process, the vaporization of the liquid will cause the internal pressure of the inner cavity to rise sharply. When the amount of chemical reagent used exceeds ⅘ of the volume of the inner cavity, the remaining ⅕ of the space is insufficient to accommodate the vaporized chemical reagent, and the internal pressure will exceed the pressure that the device can withstand, resulting in the overflow of the cobalt removal reagent or the collapse of the sealed cobalt removal device; when the amount of cobalt removal reagent used is less than ⅕ of the volume of the inner cavity, the amount of cobalt removal reagent used is insufficient to achieve a desired cobalt removal depth. Therefore, it is reasonable for the amount of cobalt removal reagent added to be between ⅕ to ⅘ of the volume of the inner cavity.

Embodiment 3

Referring to FIGS. 1-12, this embodiment provides an assembly equipment, for assembling the above-mentioned sealed cobalt removal device, including a workbench 170, on which a first assembly mechanism 180, an acid injection mechanism 190, a capping mechanism 210, and a second assembly mechanism 220 are arranged. A first industrial robotic arm 230 and a second industrial robotic arm 240 are respectively arranged on both sides of the workbench 170. The first industrial robotic arm 230 is used to clamp the pressing sleeve 112 and pre-install the pressing sleeve 112 on the pre-assembly tooling, to obtain a semi-finished tooling 320. The pre-assembly tooling is located on the workbench 170, and the pre-assembly tooling is a tooling that is configured to pre-install the clamping mechanism 120, the composite sealing ring 130, the workpiece to be subjected to cobalt removal, and the bearing block 141 in the base. The first assembly mechanism 180 is configured to tighten the pressing sleeve 112 to the outer wall of the base 111. The acid injection mechanism 190 is configured to inject the cobalt removal reagent into an inner cavity of the semi-finished tooling 320. The capping mechanism 210 is configured to press the sealing cover 142 to the top of the bearing block 141 of the semi-finished tooling 320 after the cobalt removal reagent is injected, to obtain a sealing tooling 330. The second industrial robotic arm 240 is configured to clamp the enclosing cover 113 and pre-install the enclosing cover 113 on the pressing sleeve 112 of the sealing tooling 330. The second assembly mechanism 220 is configured to tighten the enclosing cover 113 to the outer wall of the pressing sleeve 112, thereby finally obtaining a sealed cobalt removal device.

Since the structure of the sealed cobalt removal device is relatively complex, and one sealed cobalt removal device can basically only preform cobalt removal to one workpiece. If the sealed cobalt removal device is assembled manually, it is difficult to meet the cobalt removal needs for large batches of workpieces, and some core components need to be tightly installed to ensure the sealing, and manual operation is difficult to ensure the tightness of the installation. Therefore, based on the assembly equipment of this embodiment, during assembly, firstly some parts of the sealed cobalt removal device are pre-assembled to obtain a pre-installed tooling (which can be assembled manually or with automated equipment). Then the pre-assembly tooling is placed on the corresponding workstation on the workbench 170. The first industrial robotic arm 230 clamps the clamping sleeve 112 and pre-installs the clamping sleeve 112 on the pre-assembly tooling, to obtain a semi-finished tooling 320. Then the first assembly mechanism 180 tightens the clamping sleeve 112 to the outer wall of the base 111, so that the clamping sleeve 112 exerts pressure to the bearing block 141, so that the bearing block 141 presses the top surface of the composite sealing ring 130 tightly, allowing the semi-finished tooling 320 forming a tight sealed structure, and then respectively, the cobalt removal reagent is injected into the inner cavity of the semi-finished tooling 320 through the acid injection mechanism 190, and the sealing cover 142 is pressed tightly against the top of the bearing block 141 through the capping mechanism 210, to obtain the sealing tooling 330. Afterwards the second industrial robotic arm 240 clamps the enclosing cover 113 and pre-installs the enclosing cover 113 on the pressing sleeve 112 of the sealing tooling 330. Finally, the second assembly mechanism 220 tightens the enclosing cover 113 to the outer wall of the pressing sleeve 112, thereby producing the sealed cobalt removal device that meets the sealing requirements. The assembly equipment of this embodiment can automatically assemble the core components of the sealed cobalt removal device, and use mechanical force instead of manpower to ensure that the workpiece to be subjected to cobalt removal is firmly clamped and sealed, thereby ensuring the quality of cobalt removal.

It should be noted that the first industrial robotic arm 230 and the second industrial robotic arm 240 can adopt the existing multi-degree-of-freedom robotic arm, capable of clamping and multi-directional rotation to meet the use requirements. The second industrial robotic arm 240 can also be used to clamp and transfer the assembled sealed cobalt removal device to a centralized stacking box, further reducing manual labor.

As an optional embodiment, the assembly equipment also includes a first transport mechanism 250, a second transport mechanism 260, and a transfer mechanism 270. The first transport mechanism 250 is used to move the semi-finished tooling 320 in sequence along the workstations corresponding to the first industrial robotic arm 230, the first assembly mechanism 180, the acid injection mechanism 190, and the capping mechanism 210. The second transport mechanism 260 is used to move the sealing tooling 330 to a workstation corresponding to the second assembly mechanism 220. The transfer mechanism 270 is used to transfer the sealing tooling 330 from the first transport mechanism 250 to the second transport mechanism 260.

In this embodiment, since the first industrial robotic arm 230, the first assembly mechanism 180, the acid injection mechanism 190, the capping mechanism 210, the second assembly mechanism 220, and the second industrial robotic arm 240 are generally distributed along a straight assembly line. After each workstation completes the corresponding assembly work, it is necessary to move the corresponding tooling to the next workstation. However, due to the inconsistency of the assembly process and efficiency of the tooling, according to the characteristics of the production line, the first industrial robotic arm 230, the first assembly mechanism 180, the acid injection mechanism 190, and the capping mechanism 210 can be combined to form one production line, and the second assembly mechanism 220 and the second industrial robotic arm 240 can form another production line. At the same time, two independent mechanisms, the first transport mechanism 250 and the second transport mechanism 260, are provided to move and transport the corresponding tooling for different production lines, respectively. Meanwhile, the sealing tooling 330 on the production line corresponding to the first transport mechanism 250 is transferred to the production line corresponding to the second transport mechanism 260 through the transfer mechanism 270, so that they can be transported independently, ensuring the work efficiency of each process.

As an optional embodiment, the first transport mechanism 250 includes a fixing frame 251, a mobile platform 252, a first driving mechanism 253, a first telescopic mechanism 254, a lifting platform 255, and at least one first mechanical gripper 256. The fixing frame 251 is provided at the bottom of the workbench 170. The mobile platform 252 is slidably provided on the fixing frame 251. The first driving mechanism 253 is provided on the fixing frame 251, and the first driving mechanism 253 is used to drive the mobile platform 252 to slide laterally on the fixing frame 251. The first telescopic mechanism 254 is provided at the bottom of the mobile platform 252, and the telescopic end of the first telescopic mechanism 254 is movably extending through the mobile platform 252. The lifting platform 255 is provided on the top of the first telescopic mechanism 254. The first mechanical gripper 256 is provided on the top of the lifting platform 255, and the first mechanical gripper 256 is used to clamp the pre-assembled tooling and/or semi-finished tooling 320. The workbench 170 is provided with a strip-shaped groove 171 for the first mechanical gripper 256 to pass through, the strip-shaped groove 171 is parallel to the sliding direction of the mobile platform 252, and the strip-shaped groove 171 spans the workstations corresponding to the first industrial robotic arm 230, the first assembly mechanism 180, the acid injection mechanism 190, and the capping mechanism 210.

In this embodiment, during operation, the first telescopic mechanism 254 drives the lifting platform 255 and the first mechanical gripper 256 to move upward simultaneously, so that the first mechanical gripper 256 extends into the strip-shaped groove 171 of the workbench 170. Then the first mechanical gripper 256 clamps the corresponding pre-assembled tooling and/or semi-finished tooling 320. Afterwards, the first telescopic mechanism 254 continues to drive the lifting platform 255 to move upward, thereby lifting the pre-assembled tooling and/or semi-finished tooling 320 off the workbench 170 by a certain distance. Next, the first driving mechanism 253 drives the mobile platform 252 to slide laterally on the fixing frame 251, causing the first telescopic mechanism 254 on the mobile platform 252 to move laterally synchronously, so that the lifting platform 255, the first mechanical gripper 256 and the pre-assembled tooling and/or semi-finished tooling 320 are synchronously moved a corresponding distance along the direction of the strip-shaped groove 171. After the semi-finished tooling 320 is moved to the corresponding workstation, the first telescopic mechanism 254 drives the first mechanical gripper 256 to move downward and release, so as to position and place the semi-finished tooling 320 at the corresponding workstation on the workbench 170. The first telescopic mechanism 254 drives the first mechanical gripper 256 to continue to move downward and exit the strip-shaped groove 171, and then the first driving mechanism 253 drives the mobile platform 252 to move laterally in the reverse direction for resetting, preparing for the next transportation of the pre-assembled tooling and/or semi-finished tooling 320.

It should be noted that the first driving mechanism 253 can adopt a transmission structure of a motor and lead screw assembly, or a transmission structure utilizing a telescopic cylinder, which allows the movable platform 252 to slide laterally back and forth on the fixing frame 251. A guide sliding assembly can be arranged between the movable platform 252 and the fixing frame 251 to guide the sliding motion. The first telescopic mechanism 254 can adopt equipment such as a telescopic cylinder or an electric push rod, capable of achieving automatic extension and retraction. The first mechanical gripper 256 can adopt an existing electric gripper with an automatic clamping function, multiple sets of the first mechanical gripper 256 can be arranged, and each first mechanical gripper 256 can be controlled separately. This allows them to simultaneously or individually clamp the tooling at different workstations, to perform transfer operation, offering flexible operation. The second transport mechanism 260 may have the same structure as the first transport mechanism 250, thereby achieving automated transfer and transportation.

As an optional embodiment, the transfer mechanism 270 includes a support frame 271, a second telescopic mechanism 272, a second mechanical gripper 273, and a second driving mechanism 274. The support frame 271 is provided on the workbench 170 and is located between the first transport mechanism 250 and the second transport mechanism 260. The second telescopic mechanism 272 is slidably arranged on the support frame 271 (via a guide sliding assembly). The second mechanical gripper 273 is provided at the bottom of the second telescopic mechanism 272, and the second mechanical gripper 273 is used to clamp the sealing tooling 330. The second driving mechanism 274 is provided on the support frame 271, and the second driving mechanism 274 is used to drive the second telescopic mechanism 272 to slide laterally on the support frame 271.

In this embodiment, when transferring is required, firstly the second telescopic mechanism 272 drives the second mechanical gripper 273 to move downward. Then the assembled sealing tooling 330 is clamped by the second mechanical gripper 273. The second telescopic mechanism 272 drives the second mechanical gripper 273 and the sealing tooling 330 to move upward to a certain height. Afterwards, the second driving mechanism 274 drives the second telescopic mechanism 272 and the second mechanical gripper 273 below the second telescopic mechanism 272 and the sealing tooling 330 as a whole to slide laterally toward the second transport mechanism 260. Finally, the second mechanical gripper 273 is driven downward by the second telescopic mechanism 272 and the sealing tooling 330 is released, thereby realizing the automatic transfer of the sealing tooling 330.

It should be noted that the second telescopic mechanism 272 can also adopt automatic equipment such as a telescopic cylinder or an electric push rod. The second mechanical gripper 273 can be an electric gripper. The second driving mechanism 274 can use a transmission structure of a motor and lead screw assembly, or a transmission structure of a telescopic cylinder, so that the second telescopic mechanism 272 can slide laterally back and forth on the support frame 271.

As an optional embodiment, at least one set of positioning seats 280 are provided at the workstations on the workbench 170 corresponding to the first industrial robotic arm 230, the first assembly mechanism 180, the acid injection mechanism 190, the capping mechanism 210, the transfer mechanism 270, the second assembly mechanism 220, and the second industrial robotic arm 240. The positioning seats 280 are used to place semi-finished tooling 320 or the sealing tooling 330, and the positioning seats 280 are arranged along both sides of the strip-shaped groove 171.

In this embodiment, when the tooling (including pre-assembly tooling, semi-finished tooling 320 and sealing tooling 330) is moved to different workstations, the tooling can be positioned and placed on the positioning seat 280 of the corresponding workstation. The positioning seat 280 can be provided with a positioning groove to match the base 111 on which the tooling is placed, so that the tooling can be accurately mated with the corresponding mechanism after moving. Here, the positioning groove adopts a rectangular groove structure, and the side wall of the base 111 is also provided with a limiting groove that mates with the rectangular groove, so that the tooling can be limited and placed in the rectangular groove of the positioning seat 280, preventing the tooling from shifting during subsequent assembly.

As an optional embodiment, the first assembly mechanism 180 includes a support arm 181, a rotation driving mechanism 182, a third driving mechanism 183, and a twisting sleeve 184. The support arm 181 is arranged on the workbench 170. The rotation driving mechanism 182 is slidably arranged on the support arm 181. The third driving mechanism 183 is used to drive the rotation driving mechanism 182 to slide vertically along the support arm 181. The twisting sleeve 184 is connected to the bottom of the rotation driving mechanism 182, and the twisting sleeve 184 is used to tighten the pressing sleeve 112 to the outer wall of the base 111.

In this embodiment, during assembly, the third driving mechanism 183 drives the rotation driving mechanism 182 to slide vertically along the support arm 181, so that the twisting sleeve 184 is sleeved around the outer wall of the pressing sleeve 112. Here, the outer wall of the pressing sleeve 112 can be a rectangular structure, and the inner hole of the twisting sleeve 184 is a rectangular hole that mates with it. When the rotation driving mechanism 182 drives the twisting sleeve 184 to rotate, the base 111 of the tooling cannot rotate under the limiting action of the rectangular groove of the positioning seat 280, so that the twisting sleeve 184 can rotate alone. At the same time, the twisting sleeve 184 also slowly moves downward under the action of the third driving mechanism 183, thereby realizing the function of automatically tightening the pressing sleeve 112 to the outer wall of the base 111.

It should be noted that the rotation driving mechanism 182 can use a combination of components such as a motor, a reducer, to realize the rotational driving of the twisting sleeve 184, or a rotary cylinder can be used for driving. Similarly, the third driving mechanism 183 can use a transmission structure of a motor and lead screw assembly, or a transmission structure of a telescopic cylinder. The twisting sleeve 184 and the rotation driving mechanism 182 can be a detachable connection structure (such as a bolt connection), so that twisting sleeves 184 of different specifications can be replaced to facilitate matching with pressing sleeves 112 of different specifications. The second assembly mechanism 220 can adopt the same structure as the first assembly mechanism 180, and only needs to replace the twisting sleeve 184 with a specification that can match the enclosing cover 113.

As an optional embodiment, the acid injection mechanism 190 includes a first lifting mechanism 191, a pump body 192, and an acid injection tube 193. The first lifting mechanism 191 is arranged on the workbench 170. The pump body 192 is arranged on the first lifting mechanism 191, so that the pump body 192 can move up and down, and the pump body 192 is used to deliver the cobalt removal reagent. The acid injection tube 193 is connected to the pump body 192, and the acid injection tube 193 is used to inject the cobalt removal reagent into the inner cavity of the semi-finished tooling 320.

In this embodiment, when it is necessary to add the cobalt removal reagent (i.e., inject the acid solution), the pump body 192 and the acid injection tube 193 are driven downward by the first lifting mechanism 191. Here, the pump body 192 is connected to an acid delivery tube (not shown in the figures), and the acid injection tube 193 extends into the inner cavity. Then, the pump body 192 is started to inject the cobalt removal reagent into the inner cavity through the acid injection tube 193, thereby realizing automatic acid injection. It should be noted that the first lifting mechanism 191 generally adopts a lifting cylinder.

As an optional embodiment, a smoke hood 290 is provided on the workbench 170, and through-slots 291 for the semi-finished tooling 320 to pass through are formed on both sides of the smoke hood 290. The acid injection tube 193 is movable through the smoke hood 290, and a smoke exhaust pipe 310 is provided on the top of the smoke hood 290.

In this embodiment, since the process of adding the cobalt removal reagent will generate acid vapor, the smoke hood 290 can prevent the corrosive gas of the acid vapor from spreading. And the acid vapor can be discharged through the smoke exhaust pipe 310 for centralized treatment. A negative pressure device (such as a fan or a pump) can be added to rapidly extract the acid vapor in the smoke hood 290 through the smoke exhaust pipe 310.

As an optional embodiment, the capping mechanism 210 includes a second lifting mechanism 211, a movable arm 212, and a pressing rod 213. The second lifting mechanism 211 is arranged on the workbench 170. The movable arm 212 is arranged on the second lifting mechanism 211, so that the movable arm 212 can move up and down, and the movable arm 212 can move through the smoke hood 290. The pressing rod 213 is connected to the bottom of the movable arm 212, and the pressing rod 213 is used to press the sealing cover 142 tightly against the top of the bearing block 141 of the semi-finished tooling 320.

In this embodiment, since the sealing cover 142 and the top opening of the bearing block 141 are generally interference fit, it is difficult to press them tightly by manpower. Therefore, during the sealing process, firstly the sealing cover 142 is pre-installed on the top of the bearing block 141 (it can be manually operated, or automatically installed by automated equipment). Then the second lifting mechanism 211 drives the movable arm 212 and the pressing rod 213 at the bottom of the movable arm 212 to move downward, so that the sealing cover 142 is pressed tightly to the top of the bearing block 141 of the semi-finished tooling 320 through the pressing rod 213 by mechanical force, thereby finally the internal cavity of the bearing block 141 forming the sealed cavity. Similarly, the second lifting mechanism 211 generally adopts a lifting cylinder.

Example 4

Referring to FIG. 13, this embodiment provides a polycrystalline diamond compact 160, which is produced based on the above-mentioned sealed cobalt removal device, including the substrate 161, the composite layer 162 is connected to the top of the substrate 161, and the composite layer 162 includes a layer not subjected to cobalt removal 1621 connected to the top of the substrate 161, and an annular layer subjected to cobalt removal 1622 is around the periphery of the layer not subjected to cobalt removal 1621.

In this embodiment, based on the annular cobalt removal structure of the polycrystalline diamond compact 160, since the grinding part of the polycrystalline diamond compact 160 is primarily the edge area, the annular layer subjected to cobalt removal 1622 (i.e., the grinding part) is formed on the top of the composite layer 162, and the middle part of the composite layer 162 is the layer not subjected to cobalt removal 1621, thereby increasing the toughness of the middle part of the composite layer 162. This overall enhances the toughness of the polycrystalline diamond compact 160, resulting in a longer service life.

It should be noted that the cross-section of the substrate 161 and the composite layer 162 is any of circular, sector-shaped, regular polygonal, and irregular polygonal. For example, the substrate 161 and the composite layer 162 both adopt a structure with a sector-shaped cross-section or other structures of the same shape, or the substrate 161 adopts a circular cross-section while the composite layer 162 adopts a sector-shaped cross-section, thereby forming polycrystalline diamond compact 160 with various special-shaped structures, to meet the needs of special use.

As an optional embodiment, assuming that the edge cobalt removal depth of the annular layer subjected to cobalt removal 1622 is h1, the range of h1 is: h/2≤h1≤9h/10; wherein h is the thickness of the composite layer 162. It meets the requirements of ultra-deep cobalt removal, making it suitable for use scenarios with ultra-long service life.

As an optional embodiment, assuming that the radial distance between the outer edge of the top surface of the annular layer subjected to cobalt removal 1622 and the outer edge of the top surface of the layer not subjected to cobalt removal 1621 is a, the range of a is: 3000≤a≤5000 μm, which meets the effective use of the grinding part.

As an optional embodiment, the annular layer subjected to cobalt removal 1622 is divided into an edge removal area and a surface removal area according to various depths. The surface removal area is adjacent to the layer not subjected to cobalt removal 1621, and the edge removal area is located on the periphery of the surface removal area. The depth of the edge removal area is greater than the depth of the surface removal area. Assuming that the radial width of the surface removal area is a1, and the range of a1 is: 0<a1≤2000 μm.

As an optional embodiment, the top surface shape of the layer not subjected to cobalt removal 1621 is a regular shape or an irregular shape. The regular shape is, for example, a circle, an ellipse, a sector, a petal shape, or a regular polygon. If it is an irregular shape, it means that the distance between the outer edge of the top surface of the layer not subjected to cobalt removal 1621 and the outer wall of the annular layer subjected to cobalt removal 1622 may be unequal, meeting the requirements of various working conditions.

The above are only preferred embodiments of the present application, and does not limit the protection scope of the present application. Any equivalent structure or equivalent process transformation made by using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, is also included in the protection scope of the present application.