OPEN LONG-STROKE PRESS WITH TRIMMING STRUCTURE FOR DEEP DRAWN PRODUCTS

Description

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority of Chinese Patent Application No. 202411744277.5, filed on Nov. 30, 2024, the entire contents of which are incorporated herein by reference.

TECHNICAL FIELD

The present disclosure relates to the technical field of punching machines, and in particular to an open long-stroke press with a trimming structure for deep drawn products.

BACKGROUND

Open long-stroke presses are used for products that require long-stroke stamping to be formed, such as round steel barrels and other products with deep drawing strokes, including round battery cases, stainless steel barrels, etc. When forming deep drawn products, the press adopts a single or multi-pass forming process. In the multi-pass forming process, the first step is to perform a single flaring and deep stamping on the barrel body, at the same time, the remaining material is cut off, and enters the second step to further shrink the diameter of the barrel body and further increase the depth of the barrel body.

In the above stamping process, the upper opening of the barrel body forms larger burrs and flashes after shearing and stamping in the first process, when the upper opening of the barrel body is further stamped and formed in the second process, it will cause larger friction and scratches when contacting the cavity wall of the lower die, thus accelerating the abrasion of the lower die. At the same time, in order to improve efficiency, the continuous stamping forming is a continuous process, and it is difficult for the existing process to timely trim the upper opening of the barrel body formed in the previous processes.

SUMMARY

Given the deficiency of the related art, the present disclosure provides an open long-stroke press with a trimming structure for deep drawn products, thereby solving the problem of synchronous trimming of upper openings at the first forming of deep drawn products, reducing the friction between the upper openings and lower dies in the subsequent process, reducing the abrasion of lower die cavities, and improving the life of dies.

In order to solve the above technical problems, the present disclosure is solved by the following technical solutions. An open long-stroke press with a trimming structure for deep drawn products includes a press body and upper dies and lower dies arranged on the press body.

In the above solution, preferably, one of the upper dies is arranged with a forming rod, and one of the lower dies is disposed with a forming cavity matched with the forming rod;

• • the forming rod includes a rod body and a rotating sleeve integrated with the rod body;
  • the rod body and the rotating sleeve are relatively fixed or rotated by a plurality of inserts;
  • the rod body and the rotating sleeve are disposed with sliding grooves matched with the inserts;
  • the upper die is arranged with a driving ring for driving the inserts to slide vertically;
  • the driving ring is disposed with driving grooves for driving the inserts to be displaced away from a center of the rod body, and lower ends of the inserts are disposed with grinding grooves; and
  • the rotating sleeve and the rod body are disengaged from relative rotation to drive the inserts to move along the driving grooves, and upper openings of parts are ground when the inserts are on sides away from the center of the rod body.

In the above solution, preferably, the upper die is arranged with a motor, and the rotating sleeve are arranged with a synchronizing wheel transmission connected to the motor.

In the above solution, preferably, the inserts are arranged with extension rods, ends of the extension rods are connected to the inserts, and the other ends are arranged with clamping blocks slidably clamped with the driving grooves.

In the above solution, preferably, the upper die is symmetrically arranged with lifting push rods connected to the driving ring.

In the above solution, preferably, the driving ring is arranged with a plurality of contact rods corresponding to the number of inserts, and the synchronizing wheel is arranged with top blocks matched with the contact rods; and

• • the driving grooves include first track grooves corresponding to positions of the contact rods and second track grooves for connecting the adjacent first track grooves.

In the above solution, preferably, transition bevels are arranged between two ends of the top blocks and the synchronizing wheel.

In the above solution, preferably, the lifting push rods are arranged with sliding rods matched with the driving ring, ends of the sliding rods are arranged with first limiting plates, the other ends are arranged with second limiting plates after penetrating through the driving ring, and driving springs are arranged between the second limiting plates and the driving ring.

In the above solution, preferably, the top blocks and the contact rods are made of abrasion-resistant alloy.

In the above solution, preferably, the grinding grooves are arc-shaped grooves, and diameters of center arcs of the arc-shaped grooves are the same as diameters of the upper openings after the parts are formed.

In the above solution, preferably, the driving ring is arranged with guide sleeves cooperating with the contact rods, and buffer springs are arranged between the contact rods and the synchronizing wheel.

The present disclosure has the following beneficial effects. The present disclosure provides a synchronous trimming structure of an open long-stroke press for deep drawn products after stamping, the deep drawn products are synchronously trimmed and ground at the upper opening after the first stamping process, thereby reducing the abrasion between the lower dies and the upper die mandrels in the subsequent process, greatly reducing the abrasion between the upper opening and the side wall of the lower dies and the inner ring of the upper opening and the mandrel wall body, simultaneously saving the grinding time, and grinding at the same time in the continuous stamping process. Ultimately, while prolonging the service life of the dies without reducing the production efficiency, it is conducive to energy saving and emission reduction.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of a perspective structure of a press according to the present disclosure.

FIG. 2 is a schematic diagram of a bottom structure of upper dies according to the present disclosure.

FIG. 3 is a schematic diagram of a cross-sectional structure in FIG. 2 according to the present disclosure.

FIG. 4 is a schematic diagram of an explosive structure of a forming rod according to the present disclosure.

FIG. 5 is a schematic diagram of a cross-sectional structure of a driving ring according to the present disclosure.

FIG. 6 is a schematic diagram of a perspective structure of inserts according to the present disclosure.

FIG. 7 is a schematic diagram of a mating structure between the inserts and the driving ring according to the present disclosure.

FIG. 8 is a diagram of a planar movement track of the inserts at the driving ring according to the present disclosure.

DETAILED DESCRIPTION

The present disclosure will be described in further detail below with reference to the accompanying drawings and specific embodiments, referring to FIGS. 1-8:

An open long-stroke press with a trimming structure for deep drawn products includes a press body 1 and upper dies 2 and lower dies 101 arranged on the press body 1. The press body 1 is an open long-stroke press for stamping a deep drawn product, and in this example, a deep drawn stainless steel barrel body is stamped as an example.

The upper dies 2 are fixed to stamping sliding blocks of the press body 1, and the lower dies 101 are fixed to machine bases of the press body 1. One of the upper dies 2 is arranged with a forming rod 201, and one of the lower dies 101 is disposed with a forming cavity 102 matched with the forming rod 201. After a stainless steel plate is placed on the lower die 101, the steel plate is stamped and stretched by the forming rod 201 of the upper die 2, resulting in a deep drawn stainless steel barrel body. However, the stainless steel barrel body usually needs to be reduced in diameter by multiple stamping and stretching before the required stainless steel barrel body can be formed.

To keep an upper opening of the barrel body in the front-end process in a smooth state after forming, thereby reducing the abrasion of the dies in the next process. In this example, a mechanism for synchronous grinding of the upper opening of the barrel body after a single forming is arranged on the forming rod 201. This example takes the first stamping process as an example, specifically, the forming rod 201 includes a rod body 202 and a rotating sleeve 203 integrated with the rod body 202, the rod body 202 is fixedly arranged on the upper die 2, a lower end of the rod body 202 is a forming section, and an upper part of the forming section is a rod body part, which is used to connect the forming section with the upper die 2. The diameter of the rod body part is smaller than that of the forming section.

The rod body part of the rod body 202 is sleeved with the rotating sleeve 203, as shown in FIGS. 3-5, an upper end face of the forming section of the rod body 202 is butted with a lower end face of the rotating sleeve 203, and an outer diameter of a lower end of the rotating sleeve 203 is the same as that of the forming section; a plurality of sliding grooves 205 are uniformly disposed on the upper end face of the forming section around a central circumference of the rod body 202, and the sliding grooves 205 are open grooves with vertical openings; and the lower end of the rotating sleeve 203 is disposed with sliding grooves corresponding to the number of sliding grooves 205 on the forming section and having the same shape, and the length of the sliding grooves on the rotating sleeve 203 is longer than that on the forming section.

The forming section of the rod body 202 and the rotating sleeve 203 are relatively fixed or rotated by a plurality of inserts 204. Specifically, the inserts 204 are vertically sliding and clamped in the sliding grooves 205. At an initial time, lower end faces of the inserts 204 abut against groove bottoms of the sliding grooves 205 on the forming section, and the upper end faces and the groove bottoms of the sliding grooves 205 of the rotating sleeve 203 have a certain distance. At this time, an abutting plane between the upper end face of the forming section and the lower end face of the rotating sleeve 203 is located in a middle of the inserts 204, and the rod body 202 and the rotating sleeve 203 can be relatively fixed through the inserts 204. When the inserts 204 slide upward, upper end faces of the inserts 204 abut against the groove bottoms of the sliding grooves 205 of the rotating sleeve 203, the lower end faces of the inserts 204 are located above the upper end face of the forming section, and at this time, when the rotating sleeve 203 rotates, the inserts 204 can be driven to rotate synchronously relative to the rod body 202.

Outer walls of the inserts 204 are circular arc walls, and the outer wall arc diameter of the outer walls is the same as the outer diameter of the forming section of the rod body 202. When the forming rod 201 is formed with the forming cavity 102 in the lower die 101, the rod body 202 and the rotating sleeve 203 are in a fixed state, while the forming section at the lower end of the rod body 202 is seamlessly connected to a sleeve wall at the lower end of the rotating sleeve 203, outer walls of lower ends of the inserts 204 are fitted with the outer walls of the rod body 202 and the rotating sleeve 203, and an integral forming part can be formed, that is, as shown in FIG. 2. The upper opening of the formed stainless steel barrel body is positioned between the abutting plane of the upper end face of the forming section and the lower end face of the rotating sleeve 203 and the upper end faces of the inserts 204.

To make the inserts 204 move upward after the stainless steel barrel body is formed and drive the inserts 204 to slide away from the center of the rod body 202, one of the upper dies 2 is arranged with a driving ring 3 for driving the inserts 204 to slide vertically, the lower end face of the upper die 2 is symmetrically arranged with lifting push rods 5 connected to the driving ring 3, push rod ends of the lifting push rods 5 are connected to the driving ring 3, the lifting push rods 5 can adopt pneumatic push rods or hydraulic push rods, and can be adaptively adapted according to actual working conditions and power source selection.

Two sides of the inserts 204 are attached to groove sides of the sliding grooves 205 in parallel, and after the inserts 204 are embedded into the sliding grooves 205, seamless connection can be realized, that is, the gap can be ignored relative to the requirements of the metal forming die. Extension rods 206 are fixedly arranged at sides of upper ends of the inserts 204 away from the center of the rod body 202, ends of the extension rods 206 are fixed to the outer walls of the inserts 204, and the other ends are arranged with clamping blocks 207 connected to the driving ring 3. Specifically, a driving groove 301 is arranged in the driving ring 3, and the clamping blocks 207 are clamped with the driving groove 301, as shown in FIGS. 3 and 5.

In this example, taking four groups of inserts 204 as an example, a state in which the inserts 204 are matched with the driving groove 301 as shown in FIG. 5 is set. As shown in the FIG. 5, the driving groove 301 includes a first track groove 304 and a second track groove 305 for connecting adjacent first track grooves 304, the distance between the second track groove 305 and the center of the rod body 202 is greater than the distance between the first track groove 304 and the center of the rod body 202, and the first track groove 304 and the second track groove 305 are transitioned through an arc. The driving groove 301 is a T-shaped groove, the clamping block 207 and the extension rod 206 form a T-shaped clamping mechanism, the outer surface of the clamping block 207 can be arranged as a spherical surface or an arc transition surface, and the driving groove 301 penetrates through an inner hole wall of the driving ring 3.

When the inserts 204 are seamlessly embedded with the rotating sleeve 203 and the sliding grooves 205 on the rod body 202, the clamping blocks 207 of the inserts 204 are in the first track grooves 304, and the number of the first track grooves 304 corresponds to the number of the inserts 204. The driving ring 3 can achieve vertical lifting relative to the rotating sleeve 203 but cannot rotate relatively, when the rotating sleeve 203 rotates, the clamping blocks 207 of the inserts 204 are driven to rotate, and the clamping blocks 207 slide along the first track grooves 304 to the second track grooves 305, thereby displacing the inserts 204 away from the center of the rod body 202.

Lower ends of the inserts 204 are disposed with grinding grooves 302, the grinding grooves 302 are arc-shaped grooves, and diameters of center arcs of the arc-shaped grooves are the same as diameters of the upper openings after the parts are formed. After the driving ring 3 is lifted upward by the lifting push rods 5, the inserts 204 slide upward, while the rotating sleeve 203 is separated from the rod body 202 in a relative rotating state, the rotating sleeve 203 rotates to drive the inserts 204 to move along the driving grooves 301, and the upper opening of the part is ground through the grinding grooves 302 at the lower ends of the inserts 204 when the inserts 204 are on sides away from the center of the rod body 202.

The upper die 2 is arranged with a motor 4, and the rotating sleeve 203 are arranged with a synchronizing wheel 401 transmission connected to the motor 4. Preferably, the rotating sleeve 203 and the synchronizing wheel 401 can be fixed by spline or flat key connection; the motor 4 is arranged with a driving wheel, and the driving wheel and the synchronizing wheel 401 are connected through a transmission belt in a transmission way. Preferably, the driving wheel and the synchronizing wheel 401 are toothed synchronizing wheels, and the transmission belt is a synchronous belt, thereby realizing efficient power transmission. The motor 4 is a stepping motor or a servo motor, and is connected to a programmable logic controller (PLC) to realize high precision control of the rotating angle of the synchronizing wheel 401.

The driving ring 3 is arranged with a plurality of contact rods 303 corresponding to the number of inserts 204, and the contact rods 303 are arranged directly above positions of the first track grooves 304; the synchronizing wheel 401 is arranged with top blocks 402 matched with the contact rods 303, and grooves are disposed between adjacent top blocks 402, which are directly above the contact rods 303 in an initial state; transition bevels 403 are arranged between two ends of the top blocks 402 and the synchronizing wheel 401; the top blocks 402 and the contact rods 303 are made of abrasion-resistant alloy; and the driving ring 3 is arranged with guide sleeves 404 cooperating with the contact rods 303, and buffer springs 405 are arranged between the contact rods 303 and the synchronizing wheel 401.

The push rod ends of the lifting push rods 5 are arranged with sliding rods 501 matched with the driving ring 3, ends of the sliding rods 501 are arranged with first limiting plates 502, the other ends are arranged with second limiting plates 503 after penetrating through mounting plate pieces of the driving ring 3, and driving springs 504 are arranged between the second limiting plates 503 and the driving ring 3.

When the rotating sleeve 203 rotates, the synchronizing wheel 401 rotates synchronously, the top blocks 402 on the lower end face of the synchronizing wheel 401 push against the contact rods 303 to drive the driving ring 3 to press down, and the grinding grooves 302 contact the upper opening of the barrel body for grinding.

A production process for producing a stainless steel barrel using an open long-stroke press with a trimming structure for deep drawn products is as follows.

In S1, a stainless steel blank plate is placed on the lower die 101, the forming cavity 102 of the lower die 101 is arranged with a lifting ejector rod, which is a conventional arrangement of a drawing die and will not be repeated here, and a press is started to make the upper die 2 slide down through the stamping sliding block on the press body 1.

In S2, in a stamping state, the rotating sleeve 203 is integrally arranged with the rod body 202 through the inserts 204, and is in a relatively fixed state. The forming rod 201 slides down and cooperates with the forming cavity 102 to form the stainless steel barrel, and after forming, the upper opening of the stainless steel barrel is located between a joint face of the rod body 202 and the rotating sleeve 203 and the upper end faces of the inserts 204.

In S3, after the stamping is completed, the upper die 2 slides upward, and the lifting ejector rod in the lower die 101 abuts against a bottom face of the stainless steel barrel and slides upward synchronously.

In S4, simultaneously with the actions in S3, the lifting push rods 5 are started to slide the driving ring 3 upward to drive the inserts 204 to slide upward, the rotating sleeve 203 and the rod body 202 are in a state of relative rotation, and at this time, the lower end faces of the inserts 204 are located above the upper opening of the stainless steel barrel body with a spacing of 1-5 mm.

In S5, the motor 4 is started to rotate the synchronizing wheel 401 to drive the rotating sleeve 203 to rotate synchronously. When the rotating sleeve 203 rotates, the inserts 204 slide along the driving groove 301 in the driving ring 3 through the clamping blocks 207 on the extension rods 206, the inserts 204 are far away from the center of the rod body 202 when matching with the second track grooves 305, and at this time, the grinding grooves 302 at the lower ends of the inserts 204 are located right above the upper opening of the stainless steel barrel.

In S6, while the inserts 204 are matched with the second track grooves 305, the contact rods 303 are in a top contact state with the top blocks 402, the driving ring 3 is in a depressed state through the top blocks 402, and has a certain elastic buffer pressure under the action of the driving springs 504 and the buffer springs 405, which makes grinding more stable.

In S7, after the driving ring 3 is pressed down, the grinding grooves 302 are contacted with the upper opening of the stainless steel barrel through the depression of the inserts 204, and the inner and outer sides of the upper opening of the stainless steel barrel are ground.

The above examples are only used to illustrate the technical solutions of the present disclosure, rather than limiting the present disclosure. Although the present disclosure has been described in detail with reference to the foregoing examples, those ordinary skilled in the art will understand that the technical solutions disclosed in the above examples can still be modified, or some of the technical features can be replaced by equivalents. These modifications and substitutions do not make the essence of the corresponding technical solutions depart from the spirit and scope of the technical solutions of various examples of the present disclosure.