EP3197616A1

EP3197616A1 - Multi-tool for a punch device

Info

Publication number: EP3197616A1
Application number: EP16777981.8A
Authority: EP
Inventors: Andreas Deuerlein
Original assignee: Pass Stanztechnik AG
Current assignee: Pass Stanztechnik AG
Priority date: 2015-10-07
Filing date: 2016-10-04
Publication date: 2017-08-02
Anticipated expiration: 2036-10-04
Also published as: CN107708885B; US10730094B2; EP3197616B1; US20180141100A1; CN107708885A; WO2017060241A1; DE102015219416B3

Abstract

A multi-tool (5) is a component of a punch device, in particular a revolving punch press. A tool upper part (5a) has a plurality of upper tools (12, 14), which can be controlled from a head end via a machine rod (4) of the punch device for the processing of work pieces. A tool lower part (5b) has a plurality of lower tools (13). A work piece (9) can be arranged between the tool upper part (5a) and the tool lower part (5b). Each of the lower tools (13) cooperates with an associated upper tool (12). The number of upper tools (12, 14) is greater than the number of lower tools (13). As a result, a multi-tool is created for expanding the possible applications of a punch device.

Description

MULTIPLE TOOL FOR A PUNCHING DEVICE

The present patent application claims the priority of German Patent Application DE 10 2015 219 416.7, the content of which is incorporated herein by reference.

The invention relates to a multiple tool for a punching device, in particular for a turret punch press. Furthermore, the invention is directed to a punching device with a corresponding Mehrfachwerk- tool.

Such multiple tools are known, for example, from EP 2 596 878 A, from US Pat. No. 5,615,471, from JP 09-108942 A and from JP 2010-017797 A. Another tool is known from the

US 201 1/01 16881 AI.

DE 10 2005 005 214 A1 discloses a further multiple tool, a machine tool and a method for processing workpieces, in particular sheets. From DE 10 2014 224 094 AI also a multiple tool is known. JP 2008-23575 A discloses a punching device.

It is an object of the present invention to expand the application possibilities of a punching device, in particular with a motor-driven and, for example, rotatable station.

This object is achieved by a multiple tool with the features defined in claim 1 and by a punching device with the features specified in claim 7. According to the invention, it was recognized that, depending on the machining task, a lower tool, which interacts with an upper tool, is required or not. In the multiple tool according to the invention both types of upper tools are present, namely upper tools that cooperate with a lower tool and upper tools that do not interact with a lower tool. In particular, when the lower tools compared to the upper tools have an increased space requirement, can be in the upper tool then advantageously accommodate more upper tools.

The upper tools can be axially biased by springs in each case in a rest position counteracting the actuation by the machine tappet. This avoids that unselected upper tools load with their weight on the workpiece and leave unwanted marks there.

In principle, it is possible, despite a smaller number of sub-tools, to ensure interaction of each upper tool of the multiple tool with one of the lower tools. However, this requires a relative movement of the tool lower part to the tool upper part along a further degree of freedom. An embodiment according to claim 2 avoids such a further Relativverlagerungsnotwen- digkeit.

Punching tools according to claim 3 and embossing tools according to claim 4 have been found to be particularly suitable as top tools for the multiple tool. The embossing tool may be an engraving needle. When not combined with a lower tool kenden upper tool, in particular in the embossing tool, it may be a tool with spring-loaded via a compensating spring processing part, in particular spring-loaded with a compensating spring embossed part act. Alternatively, the upper tool that does not cooperate with a lower tool may be a tool for signing, countersinking or graining.

The multiple tool may have multiple types of top tools that interact with a bottom tool and / or multiple types of top tools that do not interact with a bottom tool.

At least one of the upper tools or also all upper tools can be held in the tool upper part by means of a quick-change holder. In particular, the upper tools that do not interact with a lower tool, can be performed quickly changed in this way. This is for example advantageous if you want to change quickly between a stamping and an engraving tool. An overhang of the upper tools not cooperating with a lower tool according to claim 5 allows activation of the upper tool, d. H. a generation of a supernatant of a stamping part of the upper tool on the other tool upper part, with the aid of a machine tappet with a planar actuating wall.

A circumferential arrangement of the upper tools according to claim 6 facilitates selection of the respective upper tool on the machine tappet. It is possible to use top tools that are not co-operate, in alternation with upper tools that interact with a lower tool to arrange.

The multiple tool may have, for example, eight upper tools and four lower tools. A different number of upper tools in the range between two upper tools and twenty upper tools is possible. The number of sub-tools may be in the range between a lower tool and, for example, sixteen sub-tools.

The advantages of a punching device according to claim 7 correspond to those which have already been explained above with reference to the multiple tool. A plunger assembly according to claim 8 allows an advantageous central introduction of force of the machine tappet on the upper tool part. An axial displacement of at least one housing portion of the upper tool part to the lower tool part can be done by pressing the Werkzeug- Oberteil- tappet with the machine tappet of the punching device against the spring force of a tool upper part retaining spring. In this case, a relative displacement of a central tool housing portion of the tool shell to a machine-fixed outer ring tool housing section of the tool shell can be done. A spring support according to claim 9 is also advantageous in relation to a central force introduction into the multiple tool. A peripheral ram suspension according to claim 10 counteracts a tilt tendency in the leadership of the plunger and / or the tools in the upper tool part. Conveniently, a punching device, in particular for a turret punch press, comprises

- a machine tappet, and

- a multiple tool,

- With a tool upper part with a plurality of upper tools, from a head side over a longitudinal along a

Tappet axis extending stroke movement of the machine tappet for workpiece machining can be controlled, and

With a tool lower part, wherein a workpiece can be arranged between the tool upper part and the tool lower part,

- wherein the machine tappet has a cross-sectional edge contour perpendicular to the tappet axis, which deviates from a rotational symmetry,

- wherein the machine tappet is pivotable about a ram pivot drive about the ram axis,

- Wherein the multiple tool is designed to pivot about the ram axis via a Mehrfachwerkzeug- pivot drive.

It is advantageous if the plunger pivot drive is designed to be controllable independently of the multi-tool pivot drive.

The features of such a punching device may be combined with additional features discussed above with reference to the multiple tool. Such a punching device is in It was possible to increase variability in the use of the tools of the multiple tool, in particular with tools that are not rotationally symmetrical about an individual tool axis. It has also been recognized that pivoting, on the one hand, of the machine tappet and, on the other hand, of the multiple tool, results in the possibility of performing tool selection via the machine tappet, on the one hand, and specifying orientation of the selected tool relative to the longitudinal axis of the selected tool, on the other hand. In tools to be selected with non-rotationally symmetrical to the individual tool longitudinal axis cross-sectional contour allows this pivoting of machine tappets on the one hand and multiple tools on the other hand on the orientation specification, a reduction in the number of tools vorzuhaltenden tools.

A cross-sectional edge contour of the machine tappet deviating from a rotational symmetry is present when an actuating section of the machine tappet, which comes into contact with the upper tools, has a cross-sectional edge contour deviating from the rotational symmetry. In this case, only those edge contours which merge into each other at any arbitrary rotation about the plunger axis are rotationally symmetrical. A cross-sectional edge contour of the actuating portion of the machine tappet with an N-fold symmetry, for example a twofold, threefold or quadrivalent symmetry, is in this sense an edge contour which deviates from a rotational symmetry.

An embodiment of the invention will be explained in more detail with reference to the drawing. In this show: Figure 1 is a side view of a punching device shown schematically with a multiple tool according to the invention.

2 perspective view of the multiple tool with punching device side components, namely holding components for a tool upper part and a tool lower part of the multiple tool and a machine plunger of the punching device for selecting an upper tool to be actuated, the machine plunger of the punching device an upper tool in the form of a Punching tool for

Selected operation;

FIG. 3 shows a plan view of the multiple tool with the punching device-side components according to FIG. 2; FIG.

4 is a plan view of the lower tool part of the multiple tool.

Fig. 5 to 9 respectively in an axial longitudinal section instantaneous positions of the multiple tool and the punching device side

Components during punching, so when using an upper tool in the form of a punching tool;

10 shows, in a representation similar to FIG. 2, the multi-tool with the punch-device-side components, wherein the machine ram of the punching device has selected an upper tool in the form of an embossing tool for actuation; and Fig. 1 1 to 15 in FIGS. 5 to 9 similar representation of instantaneous positions in the use of an upper tool in the form of an embossing tool, so when embossing. A stamping device 1 shown in its entirety in FIG. 1 comprises a frame or a frame 2, on whose upper frame part 3 an actuating or machine tappet 4 is attached. Under the actuating tappet 4, a tool upper part 5a of a multiple tool 5 is typically arranged in a revolver in an upper turret holder 6. At the lower frame part 7 of the frame 2, held by a lower turret holder 8, a tool lower part 5b in the form of a die. Between the tool upper part 5a and the lower tool part 5b is a workpiece 9 to be machined, which here is a metal sheet. The workpiece 9 may be a metal sheet.

2 shows a perspective view of the multiple tool with selected punching device side components, namely with broken portions of the two turret mounts 6 and 8 and with a head side of the multiple tool 5 facing, tätigungsseiti- gene portion 4a of the machine tappet 4. The operating portion 4a has, like the 3 shows a keyhole-shaped cross section, with a center Z of an eye of this keyhole cross section of the actuating section 4 a coinciding with a central longitudinal axis 10 of the multiple tool 5. The machine tappet 4 thus has a cross-sectional edge contour perpendicular to the tappet axis coinciding with the longitudinal axis 10, which deviates from a rotational symmetry.

A foot portion of the keyhole cross section of the operating portion 4a extends radially outwardly from this center Z. The actuation Section 4a of the machine tappet 4 is driven about the plunger shaft 10 pivotally or rotatably. For this purpose, a plunger-pivoting or rotary drive 1 1, which is indicated schematically in FIG. Alternatively or additionally, it is possible, instead of the actuating section 4a, to make the tool upper part 5a pivotable or rotatable about the longitudinal axis 10.

In the tool upper part 5 a is a plurality of upper tools held, which are controllable from the head side of the multiple tool 5 forth on the machine ram 4 of the punching device 1 for machining the workpiece 9. In the tool lower part 5b, a plurality of sub-tools is held. The workpiece 9 is arranged for workpiece machining between the tool upper part 5 a and the tool lower part 5 b, as shown in FIG.

In the case of workpiece machining, one of the lower tools cooperates with an associated upper tool, as far as this is selected. The upper tools in the tool upper part 5 a belong to two types of upper tools. Four of the eight upper tools in the tool upper part 5a cooperate with one lower tool each. These, with the lower tools cooperating upper tools are punching tools 12. The associated lower tools are punching dies 13. Four more of the upper tools do not cooperate with a lower tool and are designed as stamping tools 14. The number of upper tools 12, 14, namely eight, is greater than the number of lower tools 13, namely four. The embossing tools 14 do not interact with a lower tool. The upper tools 12, 14 are circumferentially arranged circumferentially about the longitudinal axis 10, wherein in each case a punching tool 12 and an embossing tool 14 follow each other in alternation. The total of eight upper tools 12, 14 are equally distributed in the circumferential direction about the longitudinal axis 10, that is arranged at a circumferential angle of 45 ° to each other.

The tool upper part 5 a also has a central tool upper part ram 15. The machine tappet 4 of the punching device 1 cooperates in each selection rotational position with the central tool upper part plunger 15 and at the same time with one of the upper tools 12, 14 on the head side together. Overall, in the illustrated embodiment, eight selection rotational positions of the actuating section 4a of the machine tappet 4 relative to the tool upper part 5a are possible.

The upper tool part 5 a is in turn divided between a central tool housing portion 16 which is held radially in a circumferential ring tool housing portion 17.

A punching process will be described below with reference to FIGS. 5 to 9. The actuating portion 4a of the machine tappet 4 is in one of four possible selection rotational positions in which it overlaps with a plunger head 18 of one of the punching tools 12 and can cooperate with this.

In the instantaneous position according to FIG. 5, the machine tappet 4 is lowered so far axially towards the multiple tool 5 that the actuating section 4 a rests on a head of the central tool upper part ram 15. Between an actuating wall 19 of the actuating portion 4a and the plunger head 18 is then still a slight distance A of a few tenths of a millimeter before. By this slight distance A is the central tool upper part plunger 15 so on the four plunger heads 18 of the punches 12 over.

In the instantaneous position according to FIG. 6, due to the actuation by the actuating section 4 a, the central tool housing section 16 is displaced axially downwards relative to the annular tool housing section 17. There is still no contact between the actuating portion 4a and the associated plunger head 18. The axial displacement of the housing sections 16, 17 relative to each other takes place against the bias of a total of eight tool upper part retaining springs 20, which are designed as axially extending coil springs and are supported between the two housing sections 16, 17. The eight tool upper part retaining springs 20 are arranged distributed in the circumferential direction around the longitudinal axis 10 of the multiple tool 5. In the instantaneous position according to FIG. 6, the tool upper part 5 a, as far as it is displaced downwards with the central tool housing section 16, is placed completely on the workpiece 9. The workpiece 9 thus limits the axial displacement of the tool upper part 5a in the instantaneous position according to FIG. 6.

FIG. 7 shows the position in which the actuating wall 19 of the actuating section 4 a of the machine tappet 4 rests on the tappet head 18 of the selected punching tool 12. Relative to the punching tools 12, the central tool-top plunger 15 is displaced downwards by the distance A compared to FIG. 6. Fig. 8 shows the actual punching momentary position during the punching operation. The operating portion 4a of the machine tappet 4 is further displaced axially downwards in comparison to FIG. The selected punch 12 and the central tool upper plunger 15 are against the bias of a central plunger spring 21 and a total of four peripheral plunger springs 22, which are arranged uniformly distributed in the circumferential direction about the longitudinal axis 10, further axially displaced downwards. A stamped part 23 of the punching tool 12 passes through the workpiece 9 and punches, cooperating with the punching die 13, out of the workpiece 9 a workpiece section of the desired shape.

The central plunger spring 21 is supported between the central tool upper plunger 15 and a central housing core 24 of the central tool housing portion 16 from. The peripheral plunger springs 22 are supported between peripheral housing parts 25 of the central tool housing section 16 and peripheral sections 15 a of the central tool upper part plunger 15.

In the punching instantaneous position according to FIG. 8, the three non-selected punching tools 12 are held by associated retaining bolts 26 in their axially upper neutral position, so that they do not load their weight onto the workpiece 9. One of these retaining bolts 26 is shown in the section of FIG. 8 cooperating with a peripheral collar 12a of one of the non-selected punches 12. In order to clarify this interaction, a section of a housing cover 27 of the central tool housing section 16 is taken away in the section of FIG. 8 in order to make visible a section of the circumferential collar 12a. The retaining pin 26 is biased by a coil spring 28 in the upper retention position. The retaining pin 26 of the selected punching tool 12 is displaced during punching against the bias of the retaining spring 28 with the selected punching tool relative to the workpiece 9 down.

Fig. 9 shows the beginning of the return of the machine tappet 4 in the starting position before punching. In this case, the operating section 4a of the machine tappet 4 again loses contact with the tappet head 18 of the selected punching tool 12. The central tooltop tappet 15 still remains in contact with the actuating section 4a due to the central tappet spring 21. Via the circumferential collar 12a, which is engaged behind by the central tool-top plunger 15, the selected punching tool 12 is pulled upwardly out of the workpiece 9 when the central tool-top plunger 15 returns. The peripheral portions 15a of the tool upper part plunger 15 engage behind the peripheral collar 12a of the selected punching tool 12 and counteract tilting of the punching tool 12 in the central tool housing section 16 when retrieving from the workpiece 9.

10 shows a relative position of the actuating portion 4a of the machine tappet 4 and the upper tool part 5a during embossing, that is to say when one of the embossing tools 14 is actuated. The actuating portion 4a of the machine tappet 4 lies in one of four possible selection rotational positions, in FIG which he overlaps with a head 29 of the embossing tools 14 and can interact with this.

The embossing process will be described below with reference to FIGS. 1 1 to 15. Fig. 1 1 shows the embossing-starting instantaneous position, in which the actuating portion 4a of the machine tappet 4 touches the head 29 of the selected embossing tool 14. The heads 29 of the embossing tools 14 are axially over both the plunger heads 18 of the punching tools 12 as well as the central tool shell plunger 15 over. Due to the projection above the central tool upper part ram 15 remains in Fig. 1 1, a distance B of about 1 mm to 10 mm between the actuating wall 19 of the actuating portion 4a and the central Werkzeug- Oberteil- plunger 15th

FIG. 12 shows the instantaneous position in which the actuating portion 4 a is lowered axially to such an extent that it rests on the central tool-top plunger 15. In this case, the selected embossing tool 14 is axially displaced downwards relative to the other components of the tool upper part 5a in that a stamping part 30 of the selected embossing tool 14 projects beyond a bottom of the tool top part 5a to a desired dimension, namely the maximum distance B ,

FIG. 13 shows the instantaneous position in which the actuating portion 4 a is displaced axially further downwards and, similarly to FIG. 6, the complete central tool housing portion 16 is axially downwards relative to the annular tool housing portion 17, ie onto the workpiece 9 to, is relocated. When placed on the workpiece 9 engages in this instantaneous position of FIG. 13, the embossing member 30, which is designed in the embodiment shown as engraving needle, in the workpiece 9 a.

The displacement of the embossing tool 14 between the instantaneous positions according to FIGS. 1 1 and 12 takes place against the bias of a retaining spring 31. The retaining spring 31 is in the foot region of the embossing tool 14 is disposed in the axial vicinity of the embossing member 30 and is supported between a peripheral collar of the embossing tool 14 and a bottom of the central tool housing portion 16 from. In the case of the other, unselected embossing tools 14, their retaining springs 31 ensure that these unselected embossing tools 14 remain in the axially upper neutral or rest position.

By relative movement of the workpiece 9 relative to the embossing member 30 in the lateral direction, ie in the two degrees of freedom perpendicular to the longitudinal axis 10, a desired pattern can now be embossed into the workpiece 9 via the embossing member 30.

Fig. 14 shows the lifting of the tool upper part 5a from the workpiece 9 after embossing. The instantaneous position according to FIG. 14 corresponds to that of FIG. 12.

Fig. 15 shows the completion of the embossing process. The actuating portion 4 a of the machine tappet 4 is lifted from the central tool top plunger 15 and the selected embossing tool 14 is returned due to the bias of the retaining spring 31 back to the neutral position, in which the embossed part is not on the underside of the tool shell 5 a survives.

Below a head 29 of each of the embossing tools 14, a compensation spring 32 surrounding the embossing tool in a head-side section is arranged. The latter is supported between the respective head 29 and a base body 14b of the embossing tool 14. With the help of the compensation spring 29, it is possible to compensate for unevenness of the workpiece 9 during an embossing process. Alternatively or additionally, with the the same spring 32 depending on an immersion depth of the embossing part 30 in the workpiece 9, a biasing force can be specified, with which the embossing member 30 presses on the workpiece 9. As an alternative to an engraving needle as a stamping part 30, a sink insert can be used in the stamping tool 14. In this case, the compensating spring 32 is dispensed with and the embossing tool is designed rigidly between the head 29 and the embossing part 30. As already mentioned above, the tool upper part 5a or also the entire multiple tool 5 can be designed to be pivotable or rotatable via a multi-tool pivot drive 34 about the longitudinal axis 10, which coincides with the plunger axis of the multiple plunger 4. The multi-tool pivot drive 34 is shown schematically in FIG.

The relative pivoting of the tool upper part 5a to the actuating section 4a of the machine tappet 4 made possible by means of the drives 11 or 34 on the one hand enables selection of the upper tool 12 or 14 and also permits relative positioning of a pivoting position of an upper tool not rotationally symmetrical about its individual tool axis to the workpiece 9. As far as the selected upper tool 12 or 14 has a not symmetrical about its longitudinal axis machining contour, an angular orientation of this machining contour can be specified to the workpiece on this relative positioning of the pivot position.

Via a further drive, it is basically possible for the lower part 5b of the tool to be independent of the upper part 5a of the tool about the longitudinal axis 10 driven to pivot or rotate to make. This can be used to associate a selected lower tool 13 with an upper tool 12. In principle, an embodiment is also possible here which has exclusively upper tools which cooperate with a lower tool, wherein nevertheless the number of upper tools is greater than the number of lower tools. The respective selected upper tool is then assigned a predetermined lower tool 13 via a corresponding relative rotation of the tool lower part 5b to the tool upper part 5a about the longitudinal axis 10.

Claims

claims

1. multiple tool (5) for a punching device (1), in particular for a turret punch press,

with a tool upper part (5 a) with a plurality of upper tools (12, 14), which are controllable from a head side via a machine tappet (4) of the punching device (1) for workpiece machining, and

with a tool lower part (5b) with a plurality of sub-tools (13),

wherein a workpiece (9) between the tool upper part (5 a) and the tool lower part (5 b) can be arranged,

wherein in each case one of the lower tools (13) cooperates with an associated upper tool (12),

characterized in that the number of upper tools (12, 14) is greater than the number of lower tools (13).

2. Multiple tool according to claim 1, characterized in that at least one of the upper tools (14) does not cooperate with a lower tool (13).

3. Multiple tool according to claim 1 or 2, characterized in that the upper tools (12) which cooperate with each one of the lower tools (13) are designed as punching tools.

4. Multiple tool according to one of claims 2 or 3, characterized in that the upper tools (14) which do not cooperate with a lower tool (13) are designed as embossing tools.

Multiple tool according to one of claims 2 to 4, characterized in that the upper tools (14) which do not interact with a lower tool (13), on the head side and the machine tappet (4) of the punching device (1) over the other tool upper part (5 a) survive.

Multiple tool according to one of claims 2 to 5, characterized in that the upper tools (12, 14) in the circumferential direction about a longitudinal axis (10) of the multiple tool (5) are arranged circumferentially, wherein an upper tool (14), which does not cooperate with a lower tool , in the circumferential direction between two upper tools (12) which cooperate with each one of the lower tools (13) is arranged.

Punching device (1) with a multiple tool according to one of claims 1 to 6.

Punching device (1) according to claim 7, characterized in that the machine tappet (4) of the punching device (1) simultaneously cooperates with a central tool upper part plunger (15) and with one of the upper tools (12, 14) on the head side.

Punching device (1) according to claim 8, characterized in that the central tool upper part plunger (15) against an actuating direction of the machine plunger (4) via a central plunger spring (21) is supported.

10. punching device (1) according to claim 8 or 9, characterized in that the tool upper part plunger (15) against the actuating direction of the machine plunger (4) via a plurality of peripheral plunger springs (22) is supported.