Device for Collecting Machining Suspensions with Material Removal and/or Tool Wear Used During the Machining of Workpiece Parts

Description

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to European Patent Application 24189719.8, filed Jul. 19, 2024, the disclosure of which is hereby incorporated by reference in its entirety.

BACKGROUND

Technical Field

The disclosure relates to a device for collecting machining suspensions used during the machining of workpiece parts with material removal/tool wear and a machine tool comprising this collecting device.

Technical Considerations

Ceramic substrates or components are used in various technical fields, such as the electronics industry, the automotive industry and in medicine (for example as hip joint prostheses). In some areas, technical ceramics have replaced metals and plastics due to their extremely hard and wear-resistant properties. Technical ceramics are used in particular in areas in which other materials reach their limits or in which the efficiency of systems needs to be improved.

The hip joint prostheses mentioned above consist of two parts, a spherical head and a cup-shaped socket. In the past, the head and socket were made of metal and/or plastic. Both materials have disadvantages, such as high wear and relatively large abrasion particles. The use of high-performance ceramics for the production of the spherical head brings an improvement here, such as very small abrasion particles and higher wear resistance.

Ceramics are a non-metallic, inorganic, temperature-resistant material that is crystalline for at least 30 % and dissolves only with difficulty or not at all in water. There are silicate, oxide and non-oxide ceramics. Materials frequently used for the production of ceramics are based on silicates, aluminum oxide, zirconium dioxide, silicon carbide and silicon nitride.

Ceramics in general are manufactured as follows: first, a semi-solid, not yet loadable blank is formed at room temperature from a raw mass of ceramic powder and binder. The blank, also referred to as a green compact, is a relatively soft, chalky green compact that can still be easily processed mechanically (e.g. by means of sawing, milling or turning). It is also common to use dry pressing compound for producing the green compact, whereby drying after shaping is not necessary.

The green compact processed in this way is finally subjected to a heat treatment (sintering), wherein a dense, hard material is obtained from the green compact. After firing or sintering, the surfaces of the components often exhibit rough spots, which are removed in a finishing process (such as grinding, lapping, polishing, etc.). For example, the spherical ceramic heads provided for a hip joint prosthesis must be polished after sintering in order to meet the requirements.

Lapping and polishing improves the dimensional accuracy and surface quality (e.g. grinding preparation, sealing surfaces) of the ceramic parts. The machining material used therefor consists of a wet, loose grain, for example of diamond particles or B4C particles. This is costly, but necessary in order to meet the requirements (for example when used as joint prostheses).

For the polishing process, the ceramic ball head is clamped into a polishing machine and polished by using diamond particles. The polishing machines used typically consist of one or two machining stations and one or two suction nozzles.

When polishing ceramic or also metallic spherical surfaces, fine particles and polishing agent residues are obtained, which are distributed in the environment. This can lead to soiling that requires subsequent and expensive cleaning. Existing solutions such as suction devices or filter mats are often ineffective or difficult to integrate.

The polishing machines used must therefore be cleaned and maintained on a regular basis, wherein it has turned out that a polishing machine with two machining stations requires an additional monthly effort according to the cleaning and maintenance plan as compared to the older generation of polishing machines with one machining station.

The diamond particles used for polishing are also disposed of in conventional polishing machines, which have a low degree of automation, which results in high costs. To reduce costs, it would be desirable not to simply dispose of the diamond particles used, but to reuse them wherever possible.

SUMMARY

It was therefore the object of the proposed solution to provide a device which makes it possible to collect and recycle the machining suspensions used for polishing, in particular polishing suspension and the particles contained therein (in particular diamond particles).

It furthermore was the object of the proposed solution to provide an optimized spray protection against aggressive polishing dirt and other impurity.

These objects are achieved with a container and a device with features as described herein.

Correspondingly, a container is provided for collecting machining suspensions used during the machining of workpiece parts, in particular polishing suspension, in a machine tool for machining workpiece parts,

• • wherein the machine tool comprises at least one tool spindle for receiving tools and at least one workpiece spindle (or workpiece holder) for receiving and holding the workpiece part to be machined,
  • wherein the container is provided for arrangement between the workpiece spindle and the tool spindle,
  • wherein the container comprises at least four side surfaces A, B, C, D, an upper side E and an underside F, the container furthermore comprising:
    • at least one first opening in at least one first side surface A of the container configured to receive the at least one tool spindle,
    • at least one second opening configured to receive the at least one workpiece spindle, wherein the second opening extends over at least two further side surfaces B, C of the container (wherein the side surfaces B, C do not correspond to the first side surface A),
    • at least one third opening configured to receive and fasten at least one bottle for collecting (collecting bottle) machining suspension,
    • wherein the at least one third opening configured to receive the at least one collecting bottle is arranged in a lower region of the container (preferably near the underside F) in such a way that the machining suspension can flow out of the container into the at least one collecting bottle automatically by means of gravity, and
    • at least a fourth opening configured for connection to a suction device.

Accordingly, a collecting container (or a collecting bell) is provided for collecting machining suspension used during the machining of workpiece parts, in particular ceramic parts (for example ceramic ball head), which is positioned in or above the machining station for external machining (for example external polishing machining) of the workpiece part, in particular ceramic part, to be machined. The present collecting container is provided as part of a device which, beside the collecting container, comprises a suction device connected to the container and optionally a linear module to which the collecting container is attached.

A polishing suspension is preferably used as the machining suspension, wherein the polishing suspension contains diamond particles (diamond powder-oil mixture) or boron carbide BAC particles. The polishing suspension is a creeping, abrasive medium with a high viscosity.

The present collecting container and the collecting device comprising the collecting container offer a simple and efficient possibility of binding polishing dirt directly at the point of origin and of minimizing its spread.

The proposed solution creates a compact, lightweight and efficiently positionable collecting or suction bell, which is provided in the immediate vicinity of the polishing tool, but does not interfere with the primary working space of the polishing device, but nevertheless enables effective dirt capture directly at the point of action.

The present collecting container or collecting bell is constructed in particular in such a way that it can be mounted on a linear module, e.g. linear slide or linear stroke, outside the radius of action of a polishing tool, especially in the context of automated polishing of hip joint implants.

With the present collecting device, it is also possible to directly collect the machining suspension obtained and, if necessary, to again supply it to the machining process and recycle it after refurbishment. Multiple reuse of the polishing particles (such as diamond particles) can thereby be ensured, which is associated with a cost reduction.

In addition, a reduction of the previously expensive cleaning steps is possible. This eliminates the need to purchase and dispose of cleaning cloths and the associated cleaning measures. It also reduces the contact of the employee responsible for cleaning with the aggressive polishing dirt and other impurities, which leads to an increase in employee satisfaction.

In general, the present collecting device including collecting container or collecting bell offers a multitude of advantages: effective collection of polishing dirt directly at the source, reduction of the cleaning expenditure after the polishing process, simple application without complex modification of existing polishing systems, no intervention in the working space of the polishing tool, improved dirt collection due to proximity to the source of origin, easy reproducibility of the collecting container by 3D printing, retrofittability to existing automation systems, cost-effective manufacture and adaptation.

The solution will be explained in detail below.

Machine Tool for Machining Workpiece Parts

As stated above, the collecting device according to the solution is provided for collecting machining suspensions used during the machining of workpiece parts, in particular ceramic parts, in combination with a machine tool, in particular a polishing machine, for machining workpiece parts, in particular ceramic parts.

The machine tool comprises a tool spindle for receiving tools and a tool motor for driving the tool spindle. The workpiece part to be machined (e.g. ceramic part) is received in a workpiece spindle or workpiece holder.

Workpiece spindle and tool spindle can be positioned relative to each other in an x-y plane, preferably around three or more machining axes.

The collecting device with the collecting container or collecting bell is provided between the tool spindle and the workpiece spindle. The collecting device is arranged in such a way that during the machining process of the workpiece part (such as ceramic part), both the workpiece part to be machined (such as ceramic part) in the workpiece spindle and the corresponding tool in the tool spindle are received and covered by the collecting container of the collecting device, so that particles obtained during machining and the machining suspension used can be collected directly in the collecting container of the collecting device.

As indicated above, for the arrangement of the collecting device between tool spindle and workpiece spindle, it is provided that the collecting container of the collecting device is attached to a movable module or slide. The slide enables a vertical or horizontal movement of the collecting container of the collecting device. Targeted movements of the slide allow the attached collecting container to be moved adaptively to the respective polishing area without colliding with the polishing tool.

Collecting Container of the Collecting Device

As described, the collecting container comprises at least four side surfaces A, B, C, D, an upper side E and an underside F.

The side surfaces A and C, the side surfaces B and D as well as upper side E and underside F of the container are preferably arranged opposite each other.

In one embodiment of the container it is provided that the side surfaces A, B, C, D and the upper side E/underside F are each arranged at a rectangular angle to each other. Thus, the side surfaces and the upper side/underside each meet vertically with right-angled edges.

In a preferred embodiment of the container, however, it is provided that the edge lines along the side surfaces B, C of the container are rounded, i.e. the container has a rounded corner or edge along these side surfaces. As will yet be explained later, the rounding enables the workpiece spindle to move along an opening over the two side surfaces. The angle of the rounding of the corner should be chosen such that the center of the suction nozzle is almost in line with the ball center of the ceramic part.

The present collecting container or collecting bell collects and binds the polishing dirt obtained during the polishing process. The collecting bell is made of a special, temperature-resistant material with a high affinity for polishing mist and polishing residues.

Preferably, the collecting container or collecting bell is manufactured additively by means of 3D printing, in particular SLS 3D printing. Selective laser sintering (SLS) is an additive manufacturing method to produce spatial structures by sintering with a laser from a powdery starting material. A thermal energy source (laser) melts powder particles in the construction area and then a new layer of powder is applied and the process is repeated. The powdery starting material used is based on thermoplastic polymers such as polyether ether ketone (PEEK), polyether ketone ketone (PEKK), polylactide (PLA), nylon and polyetherimides, polymethyl methacrylate (PMMA), polyphenylsulfone (PPSU), polyurethane (PUR), polyvinyl butryl (PVB), polycarbonate (PC) or acrylonitrile butadiene styrene (ABS).

The dimensions of the collecting container are substantially dependent on the dimensions of the machine tool and the resulting machining space between workpiece spindle and tool spindle. In one embodiment, the side surfaces A-D can each have a length of between 8 and 15 cm, preferably between 9 and 14 cm, e.g. 9 cm or 13 cm, and a width of between 5 and 10 cm, preferably between 6 and 8 cm. Upper side E and underside F can, for example, have a length of between 10 and 15 cm, preferably between 12 and 14 cm, e.g. 13 cm, and a width of between 8 and 10 cm, e.g. 9 cm. However, this information should only be regarded as an example and not as limiting, as the size of the collecting container can be adapted to the working space of the polishing tool as desired.

Opening of the Collecting Container for Tool Spindle

The collecting container according to the solution has at least one first opening in at least one side surface A configured to receive the at least one tool spindle.

In one embodiment, it is provided that the at least one first opening, preferably a circular opening, for receiving the at least one tool spindle has an internal chamfer with an angle of 10 to 40°, preferably of 15 to 30°, for a return flow of the polishing suspension.

The size of the opening correspondingly can be adjusted as desired in dependence on the size of the tool spindle. In one possible embodiment, the opening for the tool spindle has a diameter of between 5 and 15 cm, preferably between 6 and 12 cm, in particular preferably between 7 and 10 cm, e.g. 8 cm.

Opening of the Collecting Container for Workpiece Spindle

The collecting container according to the solution furthermore has at least one second opening configured to receive the at least one workpiece spindle, wherein the opening extends over at least two further side surfaces B, C of the container, wherein the side surfaces B, C do not correspond to the first side surface A.

In one embodiment, the at least one second opening for receiving the at least one workpiece spindle has an internal chamfer with an angle of 10 to 40°, preferably of 15 to 30°, for a return flow of the polishing suspension.

In one embodiment, the at least one second opening for receiving the at least one workpiece spindle is designed as an elongate opening that extends in an arc-shaped manner over the (rounded) edge over the side surface B and side surface C.

For example, the second opening for receiving the at least one workpiece spindle can also be described as a slot that extends in an arc-shaped or semicircular manner over the two side surfaces.

In a further variant, the second opening for receiving the at least one workpiece spindle can be designed and described in such a way that the slot-shaped opening extends parallel to the underside and upper side of the collecting container and two semicircles each form the end of the opening (a first semicircle in the side surface B and a second semicircle in the side surface C).

The geometric design of the second opening for receiving the at least one workpiece spindle thus provides for a movement of the workpiece spindle (and of the workpiece to be polished) in an x-y plane (relative to the tool spindle).

In a further embodiment, it is provided that a brush strip is provided along the edges of the at least one second opening for receiving the at least one workpiece spindle.

The size of the second opening for the workpiece spindle preferably is adapted to the diameter of the first opening for the tool spindle. The diameter of the second opening can thus be equal to the diameter of the first opening.

The brush strip can be designed as a strip brush. The strip brush preferably is temperature-resistant up to 180°, preferably up to 220° C.

Opening of the Collecting Container for Collecting Bottle

According to the solution, the container of the collecting device has at least one third opening which is configured to receive and fasten at least one bottle for collecting (collecting bottle) machining suspension, wherein the at least one third opening for receiving the at least one collecting bottle is arranged in a lower region of the container (i.e. preferably in or near the underside F) in such a way that the machining suspension can flow out of the container into the at least one collecting bottle automatically by means of gravity.

In order to allow the machining suspension to drain automatically into the collecting bottle (when used as intended), the container of the collecting device has at least one portion for draining the machining suspension which does not extend horizontally, but rather is inclined with respect to the vertical axis (i.e. this portion includes an angle with respect to the vertical of less than 90°).

This can be achieved by various constructions.

According to a first construction or a first embodiment, at least one portion of the underside F of the container extends with an inclination towards the at least one third opening for the collecting bottle, so that the machining suspension (e.g. polishing suspension) can flow out of the container from the underside F into the at least one collecting bottle automatically by means of gravity.

The inclined portion can comprise the entire underside F of the collecting container, i.e. the entire underside F extends with an inclination from a (rear) side surface B to a (front) side surface D. The inclination of the underside F of the collecting container can be between 10 and 40°, preferably between 15 and 30° (with respect to the horizontal).

In this first construction or embodiment, the at least one third opening for receiving and fastening the collecting bottle is preferably provided in the underside F of the collecting container. The collecting bottle is screwed into the third opening of the collecting container, i.e. there is a releasable connection between bottle and collecting container. For this purpose, the collecting bottle has an external thread and the third opening of the collecting container has a complementary internal thread, i.e. the collecting bottle thus can be mounted and demounted easily.

According to a second construction or a second embodiment it is provided that, in addition to an at least sectional inclination of the underside F of the collecting container, a protrusion or a projection is flange-mounted to the collecting container (and correspondingly projects from the collecting container), wherein the protrusion has the at least one third opening for the collecting bottle.

The protrusion flange-mounted to the collecting container has an inclination towards the at least one third opening for the collecting bottle, so that the machining suspension can automatically flow out of the container by gravity from the underside F into the flange-mounted protrusion and from there into the at least one collecting bottle.

In one embodiment of the collecting container according to the second construction or second embodiment, it is provided that the side surface D and the underside F of the collecting container do not contact each other in at least one portion, so that this at least one portion between side surface D and underside F is open, wherein the protrusion is flange-mounted to this at least one open portion.

In another preferred embodiment, the protrusion (or projection) protruding or projecting from the collecting container extends over the entire length of the contact line of side surface D and underside F of the collecting container. Here it is provided that side surface D and underside F have no contact along their entire length, so that the protrusion flange-mounted to side surface D and underside F extends over the entire length of side surface D and underside F.

The flange-mounted protrusion is inclined at an angle of 30 to 60°, preferably 40 to 50°, with respect to the side surface D of the collecting container and is likewise inclined at an angle of 30 to 60°, preferably 40 to 50°, with respect to the underside F of the collecting container.

The second construction or second embodiment of the collecting container with the protruding portion or protrusion can also be described as follows:

The (front) side surface D of the collecting container is shortened by an amount m and the underside F of the collecting container is shortened by an amount n. The corners of the side surface A, C, which meet the side surface D and the underside F, are removed by the amount m and amount n, and are thus adapted correspondingly to the shortened side surface D and underside F. The collecting container now has an elongate opening that extends along the shortened side surface D and underside F and from the side surface A to the side surface C.

The protrusion or the projecting portion of the collecting container is flange-mounted or placed at a predetermined angle (with respect to the side surface D and the underside F) along the elongate opening, extending between the shortened side surface D and underside F and from the side surface A to the side surface C of the collecting container.

The at least one third opening for fastening the collecting bottle can be provided at any position of the inclined flange-mounted protrusion. Preferably, the at least one third opening for fastening the collecting bottle is provided on the right-hand side of the housing (when looking at the front side surface D).

Opening of the Collecting Container for Connection to the Suction Device

According to the solution, the container of the collecting device has at least a fourth opening which is configured for a connection to a suction device.

This fourth opening can be of circular or slot-shaped design. The connection to the suction device can be flexible (e.g. as a hose) or rigid (e.g. as a suction channel).

In one embodiment, the collecting container of the present collecting device has the at least one fourth opening as a circular opening with an outwardly pointing suction nozzle for mounting a suction device, e.g. a suction hose. This (fourth) circular opening with suction nozzle provides for mounting a (flexible) suction hose, which is used to extract polishing suspension mist (possibly aerosols) and ceramic particles obtained during the ceramic machining.

In one embodiment of the collecting container, it is provided that the at least one fourth circular opening with suction nozzle for mounting a suction hose is arranged on a (front) side surface D of the container, i.e. on a side surface of the collecting container, which does not have any of the openings for tool spindle and workpiece spindle.

In another embodiment of the collecting container, the circular opening with suction nozzle for mounting a suction hose can be provided on the upper side E or also on the edge that connects the (front) side surface D and the upper side E. In the latter case, the suction nozzle extends diagonally upwards. In this embodiment, the suction nozzle for mounting a suction hose can be arranged at an angle of between 10-40°, preferably at an angle of 15-30° (with respect to the side surface D) on the (front) side surface.

In a further preferred embodiment, the fourth opening is of slot-shaped design. The slot-shaped opening extends at least partially, preferably completely, along the length of a side surface, preferably the side surface D of the collecting container, i.e. over the side surface of the collecting container that does not have any of the openings for tool spindle and workpiece spindle.

This slot-shaped opening is configured to connect or mount a suction device, which can be provided as a flexible suction hose or as a suction channel. In the case of a suction channel, the same consists of an inflexible material such as plastic or metal.

BRIEF DESCRIPTION OF THE DRAWINGS

In the following, the solution will be explained in more detail with reference to the non-limiting embodiments with reference to the Figures.

FIGS. 1A-D show a first embodiment of the collecting device according to the principles of the present disclosure;

FIGS. 2A-E show a second embodiment of the collecting device according to the principles of the present disclosure, and

FIG. 3 shows a third embodiment of the collecting device according to the principles of the present disclosure.

DETAILED DESCRIPTION

The first embodiment of the collecting device (10) according to the principles of the present disclosure and the collecting container (11) according to the principles of the present disclosure as shown in FIGS. 1A-1D is provided between the workpiece spindle (22) and the tool spindle (21) of a machine tool (20). Workpiece spindle (22) and tool spindle (21) can be positioned relative to each other in an x-y plane.

The collecting device (10) comprises a container (11) with four side surfaces A, B, C, D, an upper side E and an underside F. The side surfaces A and C, the side surfaces B and D as well as upper side E and underside F are each arranged opposite one another. The edge lines along the side surface B, C are of rounded design, i.e. the collecting container has a rounded corner here (see also FIG. 2C, D).

The container (11) has four openings (12, 13, 14, 16): a first opening (12) in side surface A of the container (11) for receiving the at least one tool spindle (21); a second opening (13) for receiving the workpiece spindle (22), wherein the second opening (13) extends over the side surfaces B, C of the container (11); a third opening (14) for receiving a collecting bottle (15) for collecting machining suspension, and a fourth opening (16) with outwardly pointing suction nozzle (17) for mounting a suction hose.

The first opening (12) for receiving the at least one tool spindle (21) is a circular opening (see FIG. 1C).

The second opening (13) for receiving the workpiece spindle (22) is an elongate opening which extends in an arc-shaped manner over the (rounded) edge over the side surface B and side surface C of the container (11) (see FIG. 1A, but also FIGS. 2D, 2E).

For example, the second opening (13) for receiving the at least one workpiece spindle (22) can also be described as a slot that extends in an arc-shaped or semicircular manner over the two side surfaces. The second opening (13) for receiving the at least one workpiece spindle can also be designed and described in such a way that the slot-shaped opening extends parallel to the underside and upper side of the collecting container (11) and two semicircles each form the end of the opening (a first semicircle in the side surface B and a second semicircle in the side surface C). The geometric design of the second opening (13) for receiving the at least one workpiece spindle thus provides for a movement of the workpiece spindle (and of the workpiece to be polished) in an x-y plane (relative to the tool spindle); see FIG. 1B.

A brush strip (18) is provided along the edges of the second opening (13) for receiving the workpiece spindle (22) (see FIG. 1A).

The third opening (14) for receiving (and fastening) the collecting bottle (15) is provided in the underside F of the collecting container, see FIGS. 1A, 1C. The third opening (14) has an internal thread into which an external thread of the collecting bottle engages to form a releasable connection. The machining suspension collected in the collecting container during the machining of the ceramic workpiece can flow out of the container into the collecting bottle (15) automatically by means of gravity.

For this purpose, as shown in FIGS. 1A, 1C, the underside F of the container (11) extends with an inclination towards the third opening (14) for the collecting bottle (15), so that the polishing suspension can automatically flow out of the container (11) by gravity from the underside F through the third opening (14) into the one collecting bottle (15). The inclination of the underside F of the collecting container (11) is between 15 and 30°.

The fourth circular opening (16) with suction nozzle (17) for mounting a suction hose can be provided on the upper side E or also on the edge that connects the (front) side surface D and the upper side E. In the latter case, the suction nozzle extends diagonally upwards. In this case, the suction nozzle (17) extends at an angle of 15-30° (with respect to the side surface D) (see FIGS. 1A, 1C).

According to the second embodiment shown in FIGS. 2A-E, the collecting container (11) has, in addition to an inclination of the underside F of the collecting container, a protrusion (19) or a projection which is flange-mounted to the collecting container (and correspondingly projects from the collecting container). The third opening (14) for the collection bottle (15) is provided in this protrusion (19).

As can be seen in FIG. 2A, B, E, the protrusion (19) extends with an inclination towards the third opening (14) for the collecting bottle (15), so that the polishing suspension can automatically flow out of the container (11) by gravity from the underside F into the flange-mounted protrusion (19) and into the collecting bottle (15).

The flange-mounted protrusion (19) extends along the entire length of the contact line of side surface D and underside F of the container (11).

The flange-mounted protrusion (19) is inclined at an angle of 40 to 50° with respect to the side surface D and with respect to the underside F likewise at an angle of 40 to 50° (see FIG. 2A, B, E).

The second construction or second embodiment of the collecting container with the protruding portion or protrusion can also be described as follows (see FIG. 2A, B, E).

The (front) side surface D is shortened by an amount m and the underside F by an amount n. The corners of the side surface A, C, which meet the side surface D and the underside F, are removed by the amount m and amount n, and are thus adapted correspondingly to the shortened side surface D and underside F. The collecting container now has an elongate (triangular) opening that extends along the shortened side surface D and underside F and from the side surface A to the side surface C.

The housing or housing portion is flange-mounted or placed at a predetermined angle (with respect to the side surface D and the underside F) along the elongate opening, extending between the shortened side surface D and underside F and from the side surface A to the side surface C.

The third opening (14) for fastening the collecting bottle (15) can be provided at any position of the inclined flange-mounted protrusion. Preferably, the at least one third opening for fastening the collecting bottle is provided on the right-hand side of the housing (when looking at the front side surface D) (see FIG. 2A, B, E).

The fourth opening (16) with suction nozzle (17) for mounting a suction hose is provided on the (front) side surface D of the container (11) (see FIG. 2A, B).

According to the third embodiment shown in FIG. 3, the collecting device (10) in turn consists of a container (11) with four side surfaces A, B, C, D, an upper side E and an underside F. The side surfaces A and C, the side surfaces B and D as well as upper side E and underside F are each arranged opposite one another. The edge lines along the side surface B, C are of rounded design.

The container (11) likewise has four openings (12, 13, 14, 16): a first opening (12) in side surface A of the container (11) for receiving the at least one tool spindle (21); a second opening (13) for receiving the workpiece spindle (22), wherein the second opening (13) extends over the side surfaces B, C of the container (11); a third opening (14) for receiving a collecting bottle (15) for collecting machining suspension.

The fourth opening (16) for connection to a suction device here is of slot-shaped design. The slot-shaped opening (16) extends along the length of the side surface D of the collecting container. This slot-shaped opening is configured to connect or mount a suction device, wherein the connection here is provided as a suction channel (17a).

LIST OF REFERENCE NUMERALS

10 collecting device

11 container of the collecting device

12 first opening of the container for receiving the tool spindle 21

13 second opening of the container for receiving the workpiece spindle 22

14 third opening of the container for receiving the collecting bottle 15

15 collecting bottle

16 fourth opening of the container with suction nozzle 17

17 suction nozzle

17a suction channel

18 brush strip

19 protrusion flange-mounted to the container 11

20 machine tool

21 tool spindle

22 workpiece spindle