Method and tool unit for setting a punching gap

Abstract

A tool unit (II) includes an ability to change the width (B) of a punching gap between a first tool (12) and a second tool (13). A plurality of second tools (13) jointly form a die tool with a circumferential die cutting edge in which the first tool (12) can engage with a cutting edge (22). Between the cutting edge (22) of the first tool and the respective cutting edge (21) of a second tool (12) a punching gap (23) is formed with a width (B) measured between the cutting edges (21, 22) across the working direction (A). Via lamping means (33), the deformation force acting on a second tool (13) can act transversely to the working direction (A), whereby the position of the affected cutting edge (21) and, with it, the width (B) of the punching gap (23), can be changed and set.

Claims

1. Method for setting a punching or cutting gap (23) on a tool unit (11) of a punching or cutting machine (10), wherein the tool unit (11) comprises one first tool (12) and at least two second tools (13), the method comprising: moving the one first tool (12) and the at least two second tools (13) relative to each other in a working direction (A) to define a punching or cutting gap (23) having a width (B), wherein the punching or cutting gap (23) exists between the first tool (12) and the at least two second tools (13) transversely to working direction (A), the at least two second tools (13) supported via at least one supporting part (28) in a direction transverse to the working direction (A) on a side facing away from the punching or cutting gap (23), the at least one supporting part (28) supported by a rear surface (29) on a supporting surface (30) oriented at an angle of inclination (α) in an inclined manner with respect to the working direction (A), and setting the width (B) of the punching or cutting gap (23) in a transverse direction (Q) transverse to the working direction (A) by deforming the at least two second tools (13) with a manual or automated force generating mechanism driving the at least one supporting part (28) such that the supporting surface (30) oriented at the angle of inclination (α) forces the at least one supporting part (28) to apply a deforming force (FV) to the at least two second tools (13).

2. Method as in claim 1, further comprising applying the deforming force (FV) acting on the at least two second tools (13) in a transverse direction (Q), transversely to the working direction (A).

3. Method as in claim 2, further comprising generating the deforming force (FV) via a force generating unit (40).

4. Method as in claim 1, further comprising the at least one supporting part (28) having a height (H2) smaller than a height (H1) of the at least two second tools (13).

5. Method as in claim 1, further comprising the at least one supporting parts (28) acting on the at least one second tools (13) with the deforming force (FV) acting in transverse direction (Q).

6. Method as in claim 1, further comprising applying a holding force (FH) acting in transverse direction (Q) to the at least two second tools (13).

7. Method as in claim 1, further comprising directing a deforming force (FV) toward the punching or cutting gap (23), and directing a holding force (FH) in opposite direction away from the punching or cutting gap (23).

8. Method as in claim 1, further comprising a deforming force (FV) and a holding force (FH) acting on the at least two second tools (13) at spaced-apart points arranged in extension direction of a cutting edge (21) of the at least two second tools (13).

9. Method as in claim 1, further comprising, for setting the width (B) of the punching or cutting gap (23), reducing the height (H1) of the at least two second tools (13) at least in sections.

10. Tool unit (11) for a punching or cutting machine (10), the tool unit comprising: a first tool (12) and at least two second tools (13), wherein the first tool (12) and the at least two second tools (13) can be moved for punching or cutting relative to each other in a first working direction (A), the first tool (12) and the at least two second tools (13) disposed to define a punching or cutting gap (23) having a width (B) and transverse to the working direction (A) between the first tool (12) and the at least two second tools (13), wherein the at least two second tools (13) are configured to be supported via at least one supporting part (28) in a direction transverse to the working direction (A) on a side facing away from the punching or cutting gap (23), the at least one supporting part (28) supported by a rear surface (29) on a supporting surface (30) oriented at an angle of inclination (α) in an inclined manner with respect to the working direction (A), means (28, 30, 36, 40) for generating a deforming force (FV) to deform the at least two second tools (13) by driving the at least one supporting part (28) such that the supporting surface (30) oriented at the angle of inclination (α) forces the at least one supporting part (28) to apply a deforming force (FV) to the at least two second tools (13) to apply a deforming force (FV) to the at least two second tools (13) for setting the punching gap (23) transverse to the working direction (A).

11. Tool unit as in claim 10, wherein the at least one supporting part (28) is configured to be supported with a contact surface on the at least two second tools (13) and with the rear surface (29) facing away from the punching or cutting gap (23) on the supporting surface (30) of a holding device (27) for the at least two second tools (13).

12. Tool unit as in claim 11, wherein the at least two second tools (13) are associated with at least one pulling and/or pushing means (36, 37) that acts against a movement of the at least two second tools (13) away from the supporting surface (30).

13. Tool unit as in claim 12, wherein the at least one supporting part (28) is configured to apply the deforming force (FV) for deformation of the at least two second tools (13) by acting toward the punching or cutting gap (23), and the pulling and/or pushing means (36) is configured to apply the holding force to act from the punching or cutting gap (23) away on the at least two second tools (13).

14. Tool unit as in claim 10, further comprising at least three second tools (13) jointly forming a die tool (20).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 a schematic representation resembling a block diagram of a punching machine,

(2) FIG. 2 a schematic representation of a workpiece to be punched, in plan view,

(3) FIG. 3 a schematic view in working direction of a die tool comprising several second tools,

(4) FIGS. 4 and 5 perspective representations of an exemplary embodiment of a second tool,

(5) FIGS. 6 and 7 schematic representations of a second tool, with different deforming forces for setting the punching gap,

(6) FIG. 8 a schematic side elevation, partially in section, of an alternative exemplary embodiment of a second tool, and

(7) FIG. 9 a schematic representation resembling a block diagram, of the second tool as in FIGS. 3 to 7, with a force generating unit for generating the deforming force, in plan view.

DETAILED DESCRIPTION

(8) FIG. 1 shows a punching machine 10 in a highly schematized representation. The punching machine 10 comprises an inventive tool unit 11 with a first tool 12 and a second tool 13. Furthermore, said machine is adapted to perform the method in accordance with the invention. Instead of in the punching machine 10, the invention may also be used in cutting machines or other stamping machines.

(9) The two tools 12, 13 can be moved relative to each other in a working direction A. In the exemplary embodiment, the first tool 12 is support so that it can be movably guided in the working direction A on a machine frame 14 and can be moved by means of a not specifically illustrated drive. Alternatively, the second tool 13 or both tools 12, 13 may be movably arranged. In accordance with the example, the first tool 12 represents an upper tool of the punching machine 10. In the exemplary embodiment, the second tool 13 is immovably arranged relative to the machine frame 14 and, in accordance with the example, configured as the lower tool. By a stroke the first tool 12 relative to the second tool 13 a form 15 is punched out of workpiece 16. In accordance with the example, the workpiece 16 is a plate or a foil and may be fed in the form of a web to the punching machine 10. In particular, the punching machine 10 can be used for punching foils, for example lithium foils for rechargeable batteries, in the desired form 15 out of the workpiece 16.

(10) In the exemplary embodiment described here, the tool unit 11 comprises several second tools 13 that, together, form a die tool 20. The number and arrangement of the second tools 13 depends on the form 15 that is to be punched out of the workpiece 16. Each second tool 13 has a cutting edge 21, in which case the cutting edges 21 of adjacent second tools 13 adjoin each other and form a continuous die cutting edge. In order to perform a simple cut in the workpiece 16, also a single second tool 13 may be sufficient. Correspondingly, several first tools 12 may also be provided.

(11) A punching gap 23 is formed between the cutting edge 21 of each second tool 13 and a cutting edge 22 of the first tool 12. In order to avoid losses of quality and, for example the formation of burrs on the workpiece 16 or the punched form 15, the punching gap 23 must not exceed a prespecified maximum width. At the time of the first startup of the punching machine, the punching gap 23 must be set precisely. In the course of the operation of the punching machine 10, signs of wear also occur on the at least one first tool 12 and/or on the at least one second tool 13, as a result of which the punching gap 23 can enlarge. In accordance with the invention, there is provided a means for setting the punching gap 23 with which the at least one of the two tools 13 can be plastically or elastically deformed and thereby a reduction, in particular a reduction of the width B of the affected punching gap 13 can be achieved. In the described exemplary embodiment, all the second tools 13 can be deformed, however, this need not absolutely be the case. In some applications it may be sufficient to apply a respectively associate deforming force FV to only a part of the second tools 13.

(12) The second tools 13 are releasably fastened to a holding device 27 (FIGS. 3, 6 and 7). Each second tool 13 is associated with at least one supporting part 28. In accordance with the example, each second tool 13 is allocated two or three supporting parts 28. In the exemplary embodiment according to FIGS. 3 to 7, the supporting parts 28 are located on the side facing away from the punching gap 23 or the cutting edge 21 and extend, transversely to the working direction A, in transverse direction Q away from the cutting edge 21 or the second tool 13. The orientation of the second transverse direction Q relates to the respectively second tool 13 and extend transversely to the affected cutting edge 21. Each supporting part 28 has a contact surface 28 facing the second tool 13, said contact surface contacting a counter contact surface 25 of the second tool. On the opposite side, each supporting part 28 has a second rear surface 29 facing away from the second tool 13, said rear surface being in contact with an associate supporting surface 30 of the holding device 27. The rear surface 29 and the associate supporting surface 30 extend parallel to each other and are configured as to be flat and without offsets and edges. The supporting surface 30, as well as the rear surface 29, extend at an angle of inclination a inclined relative to the working direction A. The supporting surface 30, as well as the rear surface 29 are also inclined relative to the transverse direction Q.

(13) The first underside 31 of the second tool 13, said side facing away from the first tool 12, is supported by a supporting surface 32 of the holding device 27. The underside 38 of each supporting part 28 is supported by the bearing surface 32 of the holding device 27. The undersides 31, 38 and the bearing surface 32 are preferably configured to be flat, without offsets and edges. With the use of clamping means 33, for example screw connections, each second tool 13 and each supporting part 28 are firmly clamped in place on the holding device 27 in working direction A. In accordance with the example, the underside 31 of the second tool 13 and the undersides 38 of the supporting parts 28 are clamped against the bearing surface 32 by means of an associate clamping means 33. Preferably, the clamping means 33 are configured in such a manner that they absorb no or only a minimal force in transverse direction Q transversely to the working direction A.

(14) At least one pulling and/or pushing means 36 is associated with the second tool 13 that is to be deformed, said pulling and/or pushing means being adapted to counteract a movement of the second tool 13 away from the supporting surface 30 when the supporting parts 28 and the supporting surface 30 generate a deforming force FV. FIGS. 3, 5 and 9 schematically illustrate pulling and/or pushing means 36 that are embodied as screws 37. These extend through the holding device 27 and can be shifted relative to the holding device 27 in their first direction of extension. A head 37a of the screws 37 is supported by the holding device 27, in which case their opposite end is fastened to the associate second tool 13 and, in the exemplary embodiment, screwed together via a screw thread 37b. The pulling and/or pushing means 36 and the screws 37, respectively, are arranged so as to be offset in the extension direction of the cutting edge 21 of the second tool 13 relative to the supporting parts 38 (FIGS. 3, 5 and 9), so that one of the pulling and/or pushing means 36 will not extend through the supporting parts 28. Preferably, the supporting parts 28 associated with one of the second tools 13 are arranged, in the extension direction of the cutting edge 21, between two outer pulling and/or pushing means 36 and the screws 37, respectively.

(15) One of the second tools 13 in accordance with FIG. 3 has two cutting edges 21 that form a corner 34. Different from the illustration of FIG. 3, each cutting edge 21 can be associated on the opposite side of the second tool 13 with a supporting part 28 being supported by the supporting surface 30 of the holding device 27. This second tool 13 can be adjusted in two directions with a deforming force FV for setting the width B of the affected punching gap 23. For the sake of clarity, the second tool 13 having the corner 34 is shown only with the means 28, 30, 36, 37 used for setting the punching gap 23 on the longer cutting edge 21.

(16) Due to the angle of inclination a of the supporting surface 30, it is possible to generate a deforming force FV on the second tool 13 by clamping the supporting parts 28 associated with the affected second tool 13 in place with the clamping means 33. During the clamping operation, the rear surface 29 comes into contact with the supporting surface 30 already before the underside 38 of the supporting part 28 on the supporting surface 32 has reached its end position. Due to the pulling and/or pushing means 36 and the screws 37, respectively, the second tool 13 can however not be moved away from the inclined supporting surface 30 during the clamping operation. The pulling and or pushing means 36 and the screws 37, respectively, exert a holding force FH on the second tool 13. In the direction of extension of the cutting edge 21, offset relative to these holding forces FH, each supporting part 28 produces a deforming force FV. The forces FH, FV are oriented in transverse direction Q and counteract each other. Thus, the deforming force FV is anti-parallel to the holding force FH. In doing so, the deforming force FV is great enough for deforming the second tool 13 in transverse direction Q. Due to this deformation, the position of the cutting edge 21 of the respective second tool 13 can be changed relative to the cutting edge 22 of the associate first tool 12, and thus the width of the punching gap 23 can be set. Therefore, it is possible—if necessary—to set the gap width B of the punching gap 23 at the time of the assembly, the first startup or during the running operation. For example, the gap width B can be reduced if it has increased due to wear. This shifting of the position of the cutting edge 21 to reduce the gap width B of the punching gap 23 by an increased deforming force FV of the associate supporting parts 28 is schematically shown by FIGS. 6 and 7.

(17) The position changes of the cutting edge 21 of the second tool 13 via its deformation are small and are within the range of 1 to 2 micrometers. However, this shift of the cutting edge 21 is sufficient for the subsequent adjustments of the punching gap 23—that usually has a width of 1 to 3 or up to 4 micrometers in order to obtain a qualitatively perfect and, in particular, virtually burr-free punching edge on the form 15.

(18) Instead of a screw 37 or another pulling means, the second tool 13 can be associated with a stop means, for example a stop surface or another suitable pushing means, on its side facing away from the supporting surface 30, so that the second tool 13 is deformed by means of the stop surface or the pushing means and the supporting parts 28.

(19) In order to change the deforming force FV of a second tool 13 and/or the position of its cutting edge 21, the underside 38 of the supporting part 28 is machined in this exemplary embodiment. As a result of this, the height of the supporting part 28 can be reduced in working direction A from a first height H1 to a second height H2 (FIGS. 6 and 7). Preferably, in so doing, it is only the underside 38 of the at least one associate supporting part 28 that is being machined and not the underside 31 of the second tool 13, so that only the height of the at least one supporting part 28 is changed. For example, it is possible to remove a layer from the underside 38 of the supporting part 28, as schematically illustrated by dots in FIG. 6.

(20) Inasmuch as the supporting surface 30 is inclined its distance from the first tool 12—viewed along the working direction A—decreases toward the bearing surface 32. The supporting parts 28 are clamped in place by means of the clamping means 33 until the underside 38 reaches its end position and is in contact at least in part with the bearing surface 32. As a result of this, the effective dimension of the at least one supporting part 28 increases, as it were, in transverse direction Q, i.e., viewed in the direction of the width of the punching gap 23. The rear surface 29 of the supporting parts 28 is supported by the supporting surface 30, and the opposing contact surface 26 is supported by the contact surface 26. As a result of this, they apply a greater deforming force FV on the second tool 13, compared with the deforming force FV prior to the reduction of the height of the supporting parts 28. The pulling and/or pushing means 36 and the screws 27, respectively, apply a holding force FH to the second tool 13 in order to counteract a shifting due to the forces of the supporting parts 28. As a result of this, the position of the cutting edge 21 relative to the cutting edge 22 of the first tool 12 can be changed, and the gap width B of the punching gap 23 can be reduced by a difference value D (FIG. 7).

(21) It is pointed out that the illustration of FIGS. 6 and 7 is not true to scale and merely is a schematic diagram illustrating the basic principle of the mode of operation.

(22) In modification of the described exemplary embodiment, the height of the second tool 13 and the associate supporting parts 28 may be changed, for example whenever the second tool 13 and the supporting parts are connected to each other. However, as a rule, this is not necessary, and—because of the hardness of the second tool 13—preferably only the at least one supporting part 28 is machined on its underside 38 as described hereinabove.

(23) The second tool 13, and preferably all the second tools 13 consist of steel, ceramic, hard metal or other “suitable materials. It is also possible to specially harden or make only one of the regions of the second tool 13 having the cutting edge of hard metal. In accordance with the example, the hardness of the second tool 13 or at least the region having the cutting edge is greater than the hardness of the associate supporting parts 28.

(24) In one embodiment, the region comprising the underside 31 of the second tool 13 may have a lesser hardness than the region that has the cutting edge 21. As a result of this, the underside 31 of the second tool 13 can be better machined for reducing the height.

(25) FIG. 8 shows a modified embodiment of a second tool. In this case, the supporting part 28 is not provided—as previously described—on the side opposite the cutting edge 21 but on the underside 31 of the second tool 13. The rear surface 29 provided on the supporting part 28—as previously described—is associated with a supporting surface 30. For changing the deforming force FV, also in this embodiment it is not the underside 31 that is machined but the underside 38 adjoining the rear side 29 of the supporting parts 28. When the supporting parts are clamped against the bearing surface 32, the supporting parts 28 are pushed away from the supporting surface 30 and, in doing so, can apply a deforming force FV to the second tool 13. In this exemplary embodiment, the supporting parts 28 and the second tool 13 are preferably immovably connected to each other, for example by a material-bonded connection, or without seams and joints in one piece. Other than that, the function and the design correspond to the previously described exemplary embodiments so that reference is made to the description hereinabove.

(26) FIG. 9 shows another modified exemplary embodiment. In this modification, the supporting parts 28 are omitted. The side of the tool 13 facing away from the cutting edge 21 is supported by the supporting surface 30 of the holding device 27. The supporting surface 30 is not inclined with respect to the working direction A. The second tool 13 is connected to a force generating unit 40 that may comprise, e.g., an electric motor or hydraulic or pneumatic means for generating the force. In doing so, the deforming force FV can be generated—instead of by the at least one supporting part 28—by a spindle 41 driven by an electric motor and transmitted to the second tool 13. As in the modifications described hereinabove, a holding force FH is applied to the second tool 13 via the pulling and/or pushing means 36, said holding force being directed against the deforming force FV. Therefore, it is possible, via the force generating unit 40, to set the width B of the punching gap 23 as in the other embodiments.

(27) In modification of the exemplary embodiment illustrated by FIG. 9, it is also possible for a manual setting means to be provided instead of the force generating means 40. For example, the spindle 41 can be replaced by a screw pushing against the second tool 13 or by another suitable pushing means for the manual adjustment of the deforming force FV.

(28) With the use of the force generating unit 40, it is also possible to control the width B of the punching gap of the associate second tool 13. For example, the width B can be measured, in particular, by an optical measuring device, and compared with a set value in the control unit. If there are deviations, the control unit activates the force generating unit 40 to increase or decrease the deforming force FV.

(29) In principle, it is possible in the exemplary embodiments described hereinabove to configure the supporting parts 28 and the second tool 13 as separate components or to immovably connect them to each other, for example by a material-bonded connection, or without seams and joints in one piece. The features of the diverse exemplary embodiments of the second tool 13 can also be combined with each other. Supporting parts 28 may be provided on the underside 31, as well as on the side of the second tool 13 opposite the cutting edge 21 (FIGS. 3 to 7 and 8).

(30) In all the embodiments it is advantageous to set the deforming force FV at various locations of a second tool 13 with different strengths. This is done, for example, for adapting the width B of the punching gap 23 to an uneven line of the associate edge of the first tool 12. To do so, the second tool 13 is associated, for example, with several supporting parts 28 and several pulling and/or pushing means 36, by means of which a respectively desired value for a local deforming force FV can be set.

(31) The invention relates to a tool unit 11 and a method for changing the width B of a punching gap 23 between a first tool 12 and a second tool 13 of the tool unit 11. Preferably, there are present a plurality of second tools 13 which jointly form a die tool 20 with a circumferential die cutting edge, in which the first tool 12 can engage with its cutting edge 22. Between the cutting edge 22 of the first tool 12 and the respective cutting edge 21 of a second tool 13, a punching gap 23 is formed with a width B which is measured between the cutting edges 21, 22 across the working direction A in transverse direction Q. The first tool 12 and the second tool 13 are moved relative to one another in the working direction A. Via clamping means 33, the deforming force FH acting on a second tool 13 can act transversely to the working direction A, whereby the position of the affected cutting edge 21 and, with it, the width B of the punching gap 23 can be changed and set.

LIST OF REFERENCE SIGNS

(32) 10 Punching machine 11 Tool unit 12 First tool 13 Second tool 14 Machine frame 15 Form 16 Workpiece 20 Die tool 21 Cutting edge of the second tool 22 Cutting edge of the first tool 23 Punching gap 25 Counter contact surface 26 Contact surface 27 Holding device 28 Supporting part 29 Rear surface 30 Supporting surface 31 Underside of the second tool 32 Bearing surface 33 Clamping means 34 Corner 35 Tool part 36 Pulling and/or pushing means 37 Screw 37a Head 37b Screw thread 38 Underside of the supporting surface 40 Force generating unit 41 Spindle α Angle of inclination A Working direction B Width of the punching gap D Difference value FH Holding force FV Deforming force H1 First height value H2 Second height value