Punching or riveting tool

Abstract

A punching or riveting tool, includes a bow with a movable punch and a die. The movable punch and the die are guided in a guide that is decoupled from the bow. The guide may be a guide bracket that is divided into two parts and includes two halves that can be moved relative to one another. The two halves may be coupled to one another via a sliding fit. The die and/or the movable punch may be mounted in a pivotable and/or floating manner relative to a piston or to a counterholder connected to the bow via a clearance fit which comprises a recess and a component engaging in the recess.

Claims

1.-12. (canceled)

13. A punching or riveting tool, comprising: a bow with a movable punch and a die, wherein the movable punch and the die are guided in a guide that is decoupled from the bow.

14. The punching or riveting tool as in claim 13, wherein the guide is a guide bracket.

15. The punching or riveting tool as in claim 14, wherein the guide bracket is divided into two parts and comprises two halves that can be moved relative to one another.

16. The punching or riveting tool as in claim 15, wherein the two halves are coupled to one another via a sliding fit.

17. The punching or riveting tool as in claim 13, wherein the die and/or the movable punch is mounted in a pivotable and/or floating manner relative to a piston or to a counterholder connected to the bow via a clearance fit which comprises a recess and a component engaging in the recess.

18. The punching or riveting tool as in claim 13, wherein the punching or riveting tool is a hydraulic tool.

19. The punching or riveting tool as in claim 13, wherein the die is axially displaceable.

20. The punching or riveting tool as in claim 19, wherein a counterholder for the die is axially displaceable by an eccentric.

21. The punching or riveting tool as in claim 13, wherein the guide can be coupled to a punch guide and/or die guide by a laterally insertable pin.

22. The punching or riveting tool as in claim 13, wherein the movable punch is arranged in the guide in an axially displaceable manner.

23. The punching or riveting tool as in claim 22, wherein the movable punch is arranged in the guide so as to be resettable by a spring.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The subject-matter of the invention will now be explained in more detail with reference to the drawings of FIGS. 1 through 9 by way of an exemplary embodiment.

[0038] FIG. 1 is a perspective view of a punching tool.

[0039] FIG. 2 is an exploded view.

[0040] FIG. 3 is a perspective view showing the guide together with the punch, the die and corresponding holders.

[0041] FIG. 4 is an exploded perspective view of the punch, the die together with guides.

[0042] FIG. 5 is a perspective view of the punch, the die and guides.

[0043] FIG. 6 is a detailed view of the pressure piece and an intermediate piece which is coupled to the die.

[0044] FIG. 7 is a perspective view of the intermediate piece.

[0045] FIG. 8 is a perspective view of the pressure piece.

[0046] FIG. 9 is a perspective view showing the counterholder and the die.

DETAILED DESCRIPTION

[0047] FIG. 1 is a perspective view showing a punching tool 1. The punching tool 1 comprises a bow 100 having an end 101 and an end 102.

[0048] The bow 100 may comprise a boom 103 via which the bow 103 can be suspended from a handling device (not shown).

[0049] A hydraulic cylinder 10 is inserted into the end 101 and can be fixed using a handle 14.

[0050] Hydraulic cylinder 10 comprises the hydraulic connection 12 which may come in the form of a coupling with a self-closing hydraulic valve, for example.

[0051] The hydraulic connection 12 is operable to supply the punching tool 1 with pressure. For this purpose, either a portable pressure generator (not shown) can be used, which is connected directly to the hydraulic connection 12. Alternatively, a stationary unit (not shown) can be used as a pressure generator, which is connected to the hydraulic tool 12 via a hose.

[0052] The hydraulic cylinder 10 serves to move the punch axially, the punch being accommodated in the punch guide 11.

[0053] A counterholder 20 which supports the die guide 22 is arranged on the bow end 102.

[0054] A guide bracket 200 is nested in the bow 100, the guide bracket comprising two halves 201, 202 that can be moved relative to one another. The punch guide 11 is secured by a laterally inserted pin 13. Similarly, the die guide 22 is also secured by a laterally inserted pin 23. For installing the guide bracket 200, the counterholder 20 can be retracted using an eccentric 21.

[0055] Once installed, the counterholder 20 is tightened again by means of the eccentric 21, and the guide bracket 200 is thus coupled to the bow 100.

[0056] During punching, the resulting pressing forces acting between the punch and the die are absorbed by the bow 100. This causes the opposing ends 101, 102 to deflect.

[0057] The axial guidance of the punch guide 11 and the die guide 22 is solely accomplished be the guide bracket 200.

[0058] A deflection of the arms 101, 102 relative to each other therefore does not lead to any change in the axial position of the punch guide 11 and the die guide 22 and thus of the punch and the die.

[0059] FIG. 2 is an exploded view of the punching tool 1. What can be seen now is the punch 15 which sits in the punch guide 11, as well as the die 24 which sits in the die guide 22.

[0060] In the perspective view of FIG. 3 the bow has been omitted.

[0061] Guide bracket 200 comprises the two halves 201 and 202 which can be moved relative to one another. For this purpose, dowel pins 203 are provided at the base of the guide bracket 200, which engage in corresponding locating sleeves of the respective halve 201, 202.

[0062] In this way, the distance between the arms of the guide bracket 200 can be changed.

[0063] The arms or halves 201, 202 of the guide bracket 200 comprise the two half shells 204 and 205 at their ends, which facilitate assembly.

[0064] A hydraulic piston is coupled to a pressure piece 16 via the hydraulic cylinder 10, which pushes forwards the punch 15 guided in the punch guide 11 to carry out a punching operation. During a punching operation, the punch 15 plunges into the die 24 which sits in the die guide 22 which is mounted in the half 202 of the guide bracket 200.

[0065] The resulting forces are transmitted to the end of the bow (102 in FIG. 1) via a counterholder 26.

[0066] The counterholder 2 can be tightened against the bias of a spring 25 when the guide bracket 200 is installed.

[0067] In the perspective view of FIG. 4 the guide bracket has now also been omitted. An intermediate piece 18 is pushed forward by pressure piece 16, which drives the punch 15 mounted in punch guide 11.

[0068] In the present exemplary embodiment, the pressure piece 16 is guided axially via a plastic ring 17 made of an elastic material. A clearance fit is provided between pressure piece 16 and intermediate piece 18, which is designed in such a way that a change in the axial position of the pressure piece 16 does not affect the axial alignment of the intermediate piece 18 and thus of the punch 15. Pressure piece 16 and intermediate piece 18 are therefore coupled via a floating bearing.

[0069] The counterholder 20 is also mounted in a floating manner with respect to the die 24 mounted in die guide 22.

[0070] In the perspective view of FIG. 5, the punch guide and the die guide have been also omitted now.

[0071] As already stated above, the pressure piece 16 is mounted in a floating manner relative to the intermediate piece 18.

[0072] The punch 15 sits in a punch holder 19.

[0073] Once a punching operation has been carried out, the punch holder 19 together with the punch 15 is reset by a spring 30. Spring 30 is accommodated in the housing of the punch guide.

[0074] The punch holder 19 is in the form of a sleeve that can be moved against the pressure force of the spring 30 inside the housing of the punch guide. It may be secured by a dowel pin 19a.

[0075] The punch holder 19 may come in the form of a threaded sleeve into which the punch 15 is screwed.

[0076] On the opposite side, there is the die 24 which is floatingly mounted in counterholder 26.

[0077] Details of the floating mount of the punch and the die shall now be explained in more detail with reference to FIGS. 6 through 9.

[0078] FIG. 6 is a detailed view of the pressure piece 16 and the intermediate piece 18.

[0079] Pressure piece 16 engages in a recess 18a of the intermediate piece 18.

[0080] This engagement is a clearance fit.

[0081] As shown in FIG. 7, the recess may have conical walls. A spherical design is also conceivable (not shown).

[0082] In this exemplary embodiment, the base of the recess 18a is flat.

[0083] The pressure piece 16 shown in FIG. 8 may have a conical or spherical shape, for example. In this way, tilting or an offset of the central axes of the pressure piece 16 and the intermediate piece 18 can be compensated for.

[0084] In this exemplary embodiment, the end face 16a of the pressure piece 16 is flat. The side walls can be conical.

[0085] The axial position of the intermediate piece 18 is determined solely by the guide bracket.

[0086] A similar decoupling is also provided on the side of the die 24, as shown in FIG. 9. The counterholder 26 engages in a recess 24a on the rear side of the die 24 in a floating manner.

[0087] The head of the counterholder 26 and the recess on the rear side of the die 24 may, as shown here, also comprise a conical wall or be spherical in shape.

[0088] The invention made it possible to ensure precise guidance of the punch and the die in a simple way, even when punching in high-strength materials.