Machining arrangement with a fixture with extraction groove for workpiece machining

Abstract

Machining setup for machining workpieces with - a holder (1) for receiving a workpiece (2) for processing, with a receiving surface (7) for receiving the workpiece (2), at least one extraction groove (5) in the receiving surface (7), along which a section of the workpiece (2) to be processed can be placed, and a connecting section (8) which is in flow connection with the extraction groove (5) and can be connected to an extraction device so that machining particles generated during the machining of the workpiece (2) can be extracted, - a machining tool (3) which is intended for machining the workpiece (2) and is guided along a machining path during machining which corresponds to the section of the workpiece (2) to be machined, and - an extraction enclosure (4) which can be connected to the or another extraction device so that extraction of machining particles takes place, and which surrounds the machining tool (3) at least section by section in at least one working position of the machining tool (3), wherein the extraction enclosure (4) is arranged in an area of ​​the section of the workpiece (2) to be machined on a side of the workpiece opposite the receiving surface (7), and the extraction enclosure is designed such that the machining tool (3) can be moved out of the extraction enclosure (4) during machining.

Description

Technical field

[0001] The invention relates to a machining arrangement with a receptacle that receives a workpiece, preferably consisting at least partially of plastic, for machining and through which machining materials can be extracted, and a method for extracting machining particles, in particular chips, which are produced during the machining of a workpiece. State of the art

[0002] In the production of plastic workpieces, it is often necessary to trim the workpiece to its final shape. Milling is used for this purpose, for example, producing chips. This contaminates the entire system, especially the workpiece holder, and the workpiece itself. As a result, extensive cleaning measures are required after machining, leading to high costs and downtime of the machining equipment, as well as delays in further processing or the workpiece's use. Devices for chip extraction are widely used in workpiece machining. For example, DE 10 2006 033 430 B4 discloses a machine table with three truncated cone-shaped chip discharge funnels through which metal chips fall onto a chip conveyor screw, which in turn is connected to a suction funnel.

[0003] From DE 40 27 107 A1, a device is known which has an annular suction channel attached to the machine linkage. The suction channel surrounds the section to be machined, so that a uniform suction airflow is achieved over the area where the machining residues accumulate.

[0004] Furthermore, DE 10 2010 041 250 A1 discloses a receptacle with a main body having fluid outlet openings and essentially forming a chamber, and a surrounding frame. The workpiece and the receptacle must be geometrically matched to ensure a sealing receptacle.

[0005] DE 197 58 436 A1 also reveals a photograph with a suction groove.

[0006] Such extraction systems have proven their worth. However, increasingly stringent requirements are being placed on preventing contamination of the workpiece holder and the workpieces being machined. Therefore, it is necessary to improve existing extraction devices to ensure reliable and complete extraction, especially during rapid rotation of a machining tool. Description of the invention

[0007] The object of the present invention is to minimize or completely avoid contamination caused by machining particles during the processing of workpieces. The aim is to create a versatile device for extracting machining particles with a simple design, thus minimizing cleaning measures after machining.

[0008] This problem is solved according to the invention by a machining arrangement having the features of claim 1 and a method having the features of claim 8.

[0009] Accordingly, the receiving surface of the fixture, on which a workpiece is held, has at least one extraction groove along which a section of the workpiece to be machined is to be positioned. Machining particles generated during the machining of the workpiece can thus be extracted via the extraction groove.

[0010] The invention is based on the idea that a defined and directed airflow is ensured at the point of origin of the machining particles by means of an extraction groove running along a section being machined. The extraction groove enables an airflow from the end region of the opening in the workpiece, i.e., the currently machined section, which optimally removes the emitted machining particles.

[0011] Since a receiving surface is present that holds the workpiece, a suction groove on the surface of the receiving surface forms a channel enclosed by the workpiece, along which a directed airflow is possible. By closing the suction groove through the workpiece to the currently machined section, a channel is formed whose end is always located directly at the respective machined section. Because this air volume at the end of the channel is contaminated with machining particles, the principle according to the invention can effectively prevent the unwanted distribution of machining particles into the surrounding environment.

[0012] By positioning the workpiece so that the extraction groove in the extraction area runs along the section being processed, it can be ensured that the airflow through the extraction groove always passes directly through the section being processed, thus ensuring that air is always extracted from around this section. The extraction of processing particles occurs due to a negative pressure generated by the extraction device.

[0013] The defined and directed airflow around the area where machining particles are generated during machining makes it possible to reduce contamination of the tool holder, the workpiece, and the surrounding environment. In particular, it allows for the near-complete extraction of machining particles. By reducing machining particles within a machining cell—which includes the enclosed housing around the machining tool and tool holder—current explosion protection regulations can be adjusted. Simultaneously, occupational safety can be improved and costs reduced.

[0014] The device can be used almost regardless of the workpiece's shape. For the workpiece to seal the extraction groove, it simply needs a flat surface around at least the area to be processed. It is assumed that no air can be drawn into the extraction groove, for example, through its side ends.

[0015] Particularly advantageous embodiments of the invention are specified in the dependent claims.

[0016] Preferably, the receptacle has at least one extraction bore that is in flow communication with the at least one extraction groove and extends from there into the receptacle to the connection section. This allows, in particular, the connection section, which can be connected to an extraction device, to be arranged below the receptacle. The extraction effect is also improved if, for example, an extraction bore is connected to the extraction device instead of one end of the extraction groove, thus shortening the extraction path.

[0017] Furthermore, it is advantageous to have several extraction holes spaced apart along the extraction groove. This allows an extraction hole to always be located in front of the section being machined, in the direction of the path traveled during machining. The advantages are particularly evident when machining along the extraction groove has progressed to the point where the first extraction hole extending from the groove into the workpiece is located in an already machined area. For example, a vacuum for extraction is applied to one or more extraction holes leading away from the extraction groove in front of the section being machined. An extraction hole located behind the section being machined no longer contributes to extraction and can be closed.In the case of a single, rear extraction groove, it would otherwise no longer be possible to generate an airflow that runs directly along the section being processed.

[0018] If, in particular, the extraction groove has a U-shaped cross-section when viewed perpendicular to its longitudinal direction, optimal airflow for transporting machining particles can be achieved. However, the design of the extraction groove is not limited to a U-shape; it could, for example, also have a V-shape.

[0019] Furthermore, a machining arrangement with a fixture and a machining tool intended for machining the workpiece, which is guided along a machining path corresponding to the section of the workpiece to be machined, can have a design in which the machining tool projects into the extraction groove in at least one working position. This simplifies the guidance of the machining tool and simultaneously optimizes the extraction effect.

[0020] The machining arrangement includes an extraction enclosure that can be connected to the extraction device, which is in flow communication with the extraction groove, or to another extraction device, so that machining particles are extracted via the extraction enclosure. At least in one working position of the machining tool, preferably an initial one, the extraction enclosure surrounds the machining tool at least partially. The extraction enclosure is arranged in a region of the workpiece section to be machined, preferably an initially machined section, on a side of the workpiece opposite the receiving surface. This allows the extraction effect of the inventive device to be improved, particularly during the initial machining of the workpiece, while the workpiece essentially completely closes the extraction groove and thus extraction via the extraction groove is not yet sufficiently effective.In this case, a sufficient airflow through an opening created in the workpiece by the machining process is not yet possible to transport machining particles away "over a wide area".

[0021] Further features and advantages of the invention will become more apparent from the following detailed description. Brief description of the drawings Fig. Figure 1a shows a cross-section along the longitudinal direction of the extraction groove of a machining arrangement according to the invention with a workpiece (along the line AA of Fig. 1b); Fig. 1b shows a top view of the machining arrangement according to the invention with a workpiece; Fig. Figure 1c shows a cross-section of the machining arrangement according to the invention with a workpiece transverse to the longitudinal direction of the extraction groove (along line BB of Fig. 1b); Fig. Figure 2 shows the machining arrangement according to the invention with a workpiece; and Fig. Figure 3 shows the machining arrangement according to the invention with a workpiece. Detailed description of an embodiment

[0022] One embodiment of the present invention is described in detail below with reference to the accompanying drawings.

[0023] Fig. Figure 1a shows a receptacle 1 that receives a workpiece 2 for machining, which preferably consists at least partially of plastic. The receptacle 1 has a receiving surface 7 on which the workpiece 2 rests and which has at least one extraction groove 5. A connecting section 8 is in flow communication with the extraction groove 5 via extraction bores 6 and can be connected to an extraction device (not shown) so that machining particles, in particular chips, which are generated during the machining of the workpiece 2, can be extracted via the extraction groove 5. The connecting sections 8 preferably extend perpendicularly from the extraction groove 5.

[0024] The arrows in Fig. 1a indicates the airflow that results around the section being machined, in particular around the machining tool 3, because a sufficiently high airflow is achieved by connecting an extraction device to at least the left connection section 8 of Fig. 1a is present.

[0025] Fig. Figure 1b clarifies that the workpiece 2 no longer covers the extraction groove 5 in the area where machining has already taken place, leaving the extraction groove 5 open in this area. Only in the unmachined area is an airflow channel formed through the extraction groove 5 and the workpiece 2. Thus, air is drawn in through this channel, particularly from the immediate vicinity of the section being machined.

[0026] Fig. Figure 1c shows that the extraction groove 5 can, in particular, have a U-shaped cross-section. Furthermore, the machining tool 3 can project into the extraction groove 5 while machining the workpiece 2.

[0027] Fig. Figure 2 shows two extraction bores 6, which are in flow communication with the extraction groove 5 and extend from it into the receptacle 1 to the connection section (not shown). The number of extraction bores in a receptacle can be, for example, 15. The extraction bores 6 are arranged at a distance from each other along the extraction groove 5. It is conceivable that extraction takes place via the left extraction bore 6 as long as the machining tool 3 is located to the left of this extraction bore; after the machining tool 3 has moved to the right via the left extraction bore 6, the right extraction bore 6 is used. Fig. 1 is responsible for extraction via the extraction groove 5. In other words, after the machining tool 3 has passed over an extraction bore 6, this bore is closed and the extraction bores adjacent in the machining direction or several subsequent extraction bores are switched to negative pressure.

[0028] The machining tool 3, which can be a chip-removing tool such as a milling tool, is guided along a machining path that corresponds to the section of the tool 2 being machined. This machining path, in turn, corresponds to the path of the extraction groove 5 in the holder 1. This path can be a straight line, as shown in the figures. The extraction groove 5 is then also straight. If the overall machining process is not straight, the workpiece 2 must be moved after completion of a partial machining step so that the next partial machining step can again be performed along the extraction groove 5. The groove can be located in the center of the holder 1, but any other arrangement and orientation is also conceivable.

[0029] The extraction groove 5 extends along the surface of the receiving surface 7 and preferably has the maximum possible length determined by the receiving surface. The width of the extraction groove is preferably approximately one to three times the width or diameter of the part of the machining tool with which the workpiece is directly machined, such as the milling cutter. The depth of the extraction groove is preferably approximately one to four times the width or diameter of the part of the machining tool with which the workpiece is directly machined, measured from the receiving surface of the receiving surface.

[0030] Fig.Figure 3 shows an extraction enclosure 4, which can be connected to an extraction device and through which machining particles are extracted. The extraction enclosure 4 is arranged on the side of the workpiece 2 opposite the side of the receiving surface 7, so that the extraction enclosure 4 is positioned above the workpiece 2, which in turn rests on the receiving surface 1. The extraction enclosure 4 is designed to surround at least part of the machining tool 3. The extraction enclosure 4 is positioned in the area that is to be machined at the beginning of a machining operation.

[0031] As the machining process progresses, the recess or opening formed in the workpiece 2 by the machining will be sufficiently large that the resulting airflow around the section being machined will draw the machining particles away via the extraction groove 5, thus rendering the extraction enclosure 4 unnecessary. Preferably, the extraction enclosure 4 is therefore designed such that the machining tool 3 moves out of it during machining and the enclosure can be easily removed.

[0032] The present invention is not limited to the described embodiment. In particular, those skilled in the art will recognize that it is also possible to provide several extraction grooves 5, optionally of different shapes, in the receptacle 1.

[0033] The features of the dependent claims relating to the processing arrangement also characterize the claimed method.

Claims

[1] Machining arrangement for machining workpieces with - a holder (1) for receiving a workpiece (2) for processing, with a receiving surface (7) for receiving the workpiece (2), at least one extraction groove (5) in the receiving surface (7), along which a section of the workpiece (2) to be processed can be placed, and a connecting section (8) which is in flow connection with the extraction groove (5) and can be connected to an extraction device so that machining particles generated during the machining of the workpiece (2) can be extracted, - a machining tool (3) which is intended for machining the workpiece (2) and is guided along a machining path during machining which corresponds to the section of the workpiece (2) to be machined, and - an extraction enclosure (4) which can be connected to the or another extraction device so that extraction of machining particles takes place, and which surrounds the machining tool (3) at least section by section in at least one working position of the machining tool (3), wherein the extraction enclosure (4) is arranged in an area of ​​the section of the workpiece (2) to be machined on a side of the workpiece opposite the receiving surface (7), and the extraction enclosure is designed such that the machining tool (3) can be moved out of the extraction enclosure (4) during machining. [2] Processing arrangement according to claim 1, characterized by , that the machining tool (3) protrudes into the extraction groove (5) at least in one working position. [3] Machining arrangement according to one of the preceding claims, wherein the receptacle has at least one extraction bore (6) which is in flow communication with the at least one extraction groove (5) and extends from the latter into the receptacle to the connection section. [4] Processing arrangement according to claim 3, wherein the recording characterized by is that several extraction bores (6) are arranged spaced apart from each other along the extraction groove (5). [5] Processing arrangement according to one of the preceding claims, wherein the recording characterized by is that the extraction groove (5) has a U-shaped cross-section transverse to the longitudinal direction of the extraction groove. [6] Processing arrangement according to one of the preceding claims, characterized by , that the machining tool (3) is a chip-producing tool. [7] Machining arrangement according to claim 6, wherein the chip-removing tool is a milling cutter. [8] Method for extracting machining particles generated during the machining of a workpiece (2) with a machining arrangement according to one of the preceding claims, wherein the workpiece (2) is received in a receptacle (1) which has a receiving surface (7) with at least one extraction groove (5) such that a section of the workpiece (2) to be machined runs along the extraction groove (5), and Processing particles are extracted during the processing of the workpiece (2) by means of the extraction groove (5).

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