Blanking punch

Abstract

A blanking punch which extends from a first portion to a second portion along a blanking direction is provided. The second portion has a cutting edge. An engaging portion is provided/designed between the first portion and the second portion. The engaging portion enables the blanking punch to be removed from a workpiece counter to the blanking direction.

Claims

1. A blanking punch, comprising: a first portion; a second portion extending away from the first portion in a blanking direction; and an engaging portion longitudinally between the first portion and the second portion, wherein the second portion has a cutting edge, the first portion has an axial end facing away from the blanking direction configured to receive a blanking force from a pressure shoulder of a blanking mandrel which supports the blanking punch during a blanking operation on a workpiece, and the engaging portion is configured to be coupled to the blanking mandrel, and to be directly coupled to an extraction tool different from the blanking mandrel such that the blanking punch is extractable by the blanking punch from the workpiece in a direction counter to the blanking direction.

2. The blanking punch according to claim 1, wherein the engaging portion is round in cross section and the engaging portion has at least one circumferentially arranged engaging element that is oriented in an inclined manner along a longitudinal axis of the blanking punch.

3. The blanking punch according to claim 1, wherein the engaging portion is in the form of a thread.

4. The blanking punch according to claim 2, wherein the engaging portion is in the form of a thread.

5. The blanking punch according to claim 1, wherein a diameter of the first portion immediately adjacent to the engaging portion is smaller than an outside diameter of the engaging portion.

6. The blanking punch according to claim 4, wherein a diameter of the first portion immediately adjacent to the engaging portion is smaller than an outside diameter of the engaging portion.

7. The blanking punch according to claim 1, wherein the first portion has an engaging region for arrangement of a blanking punch driving tool.

8. The blanking punch according to claim 6, wherein the first portion has an engaging region for arrangement of a blanking punch driving tool.

9. A blanking mandrel, comprising: a blanking punch according to claim 1; and a punch receptacle in which the blanking punch is arranged.

10. The blanking mandrel according to claim 9, wherein the blanking punch is arrangeable in the punch receptacle via the engaging portion.

11. A blanking tool, comprising: a blanking mandrel according to claim 9.

12. A blanking set, comprising: a blanking tool according to claim 11; and an extraction tool, wherein the extraction tool has an arranging portion corresponding to the engaging portion, and a stop.

13. The blanking set according to claim 12, wherein the extraction tool is designed to effect extraction of the blanking punch from a workpiece by rotation.

14. The blanking set according to claim 12, wherein the extraction tool is at least regionally in the form of a sleeve, and the stop is in the form of a stop face on an end of the sleeve.

15. The blanking set according to claim 13, wherein the extraction tool is at least regionally in the form of a sleeve, and the stop is in the form of a stop face on an end of the sleeve.

16. The blanking set according to claim 12, wherein the arranging portion is in the form of a threaded portion and the arranging portion is at least as long as the engaging portion.

17. A method for blanking with a blanking punch having a first portion, a second portion extending away from the first portion in a blanking direction, and an engaging portion longitudinally between the first portion and the second portion, the engaging portion being configured to be coupled to a blanking mandrel which supports the blanking punch during a blanking operation on a workpiece and to be coupled to an extraction tool which removes the blanking punch from the workpiece in a direction counter to the blanking direction, comprising the acts of: coupling the blanking punch to the blanking mandrel; using the blanking mandrel to advance the blanking punch in the blanking direction during a blanking operation; removing during the blanking operation a portion of a workpiece corresponding to a shape of the blanking punch as the blanking punch advances in the blanking direction; removing the blanking mandrel from the blanking punch while the blanking punch remains in the workpiece after blanking; installing an extraction tool onto the engaging portion of the blanking punch on a side of the workpiece from which the blanking mandrel was removed, until a stop on which the extraction tool is supported has been reached; using the extraction tool to remove the blanking plug from the workpiece in a direction counter to the blanking direction.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is an arrangement of a blanking punch together with a die on a workpiece in a perspective illustration before blanking.

(2) FIG. 2 is the configuration from FIG. 1 after the blanking operation.

(3) FIG. 3 is the blanking punch from FIGS. 1 and 2, as is arranged in the workpiece after blanking.

(4) FIG. 4 shows the cooperation of an extraction tool with the blanking punch known from FIGS. 1 to 3.

(5) FIG. 5 is the extraction tool from FIG. 4 with the blanking punch fully removed from the workpiece.

(6) FIG. 6 is a further embodiment of a blanking punch.

DETAILED DESCRIPTION OF THE DRAWINGS

(7) FIG. 1 shows a perspective illustration, illustrated partially in section, of a blanking mandrel including a punch receptacle 20, in which a blanking punch 10 is arranged. The entire arrangement extends along a longitudinal axis L, wherein the reference sign S and the corresponding arrow indicate a blanking direction. The blanking mandrel is arranged on a workpiece 50, for example on a (multilayer) metal sheet, wherein, on the opposite side from the blanking mandrel, a die 60 bears against the workpiece or metal sheet 50. The blanking punch 10 includes a first portion 11 and a second portion 12, wherein an engaging portion 16 is arranged in between. According to a preferred embodiment, the latter has an external thread or is formed as a thread, although this is not shown in the illustration sketched here for reasons of clarity. The second portion 12 includes a round, in particular circular, cutting edge 14, while the first portion 11 has an engaging region 40, which is discernible as a small slit in FIG. 1. The reference sign 22 furthermore indicates a pressure shoulder of the punch receptacle 20, which serves to transmit the blanking force into or onto the blanking punch 10 ultimately via the punch receptacle 20 and to distribute it more uniformly (and for example not just via the engaging portion 16 of the blanking punch 10).

(8) FIG. 2 shows substantially the configuration known from FIG. 1 after the blanking operation. The blanking punch 10 has, in this view, passed through the workpiece 50 and formed a blanked slug 52, which is or can be collected for example by the die 60. The punch receptacle 20 can now be removed, in particular unscrewed, from the blanking punch 10, which sits in the workpiece 50.

(9) FIG. 3 shows the blanking punch 10 after removal of the punch receptacle 20. Expediently, the engaging portion 16, which is preferably in the form of a thread or comprises a thread, now allows the blanking punch 10 to be removed counter to the blanking direction S.

(10) In FIG. 4, an extraction tool 30 has now been arranged on the blanking punch 10. In particular, the extraction tool 30 has been screwed on, wherein, for this purpose, it has an arranging portion 32 that has a geometry corresponding to the engaging portion 16, i.e. in the present case is preferably in the form of an internal thread. The extraction tool 30 is substantially in the form of a sleeve, wherein it ends in the blanking direction S with a stop or a stop face 34 that bears against a surface of the workpiece 50. Said surface forms so to speak the counter-stop. If, in this configuration, the punch receptacle 30 is now rotated further, the blanking punch 10 is moved out of the workpiece 50 counter to the blanking direction S. In order to apply the necessary force to the extraction tool 30, the latter advantageously has an engaging region 40′, which serves for example for the arrangement of an open-end wrench. While the thread of the engaging portion 16 and of the arranging portion 32 is for example an M8 thread according to preferred embodiments, a width across flats of the engaging region 40′ is for example 27 mm.

(11) Finally, FIG. 5 shows how the blanking punch 10 has now been removed from the workpiece 50 counter to the blanking direction S, wherein it is clearly apparent that, in particular as a result of the arrangement or support of the extraction tool 30 via its stop face 34 on the workpiece 50, exact moving out along the longitudinal axis L is possible without jamming or the like. Via an engaging region 40 in the blanking punch 10, the latter can now be screwed easily out of the punch receptacle 30. It is also apparent from this view, in particular compared with FIG. 4, that the arranging portion 32 is much longer than the engaging portion 16, thereby ensuring that the blanking punch 10 is securely retained in the punch receptacle 30 even after removal from the workpiece 50.

(12) FIG. 6 shows a further embodiment of a blanking punch 10, including a first portion 11, an engaging portion 16 and a second portion 12. Provided or arranged on the end of the second portion 12, which forms a cutting edge 14, is a point 15, with the result that the blanking forces can be reduced, since the flow properties of the workpiece are positively influenced thereby.

LIST OF REFERENCE SIGNS

(13) 10 Blanking punch 11 First portion 12 Second portion 14 Cutting edge 15 Point 16 Engaging portion 20 Punch receptacle 22 Pressure shoulder 30 Extraction tool 32 Arranging portion 34 Stop, stop face 40, 40′ Engaging region 50 Workpiece 52 (Blanked) slug 60 Die L Longitudinal axis S Blanking direction

(14) The foregoing disclosure has been set forth merely to illustrate the invention and is not intended to be limiting. Since modifications of the disclosed embodiments incorporating the spirit and substance of the invention may occur to persons skilled in the art, the invention should be construed to include everything within the scope of the appended claims and equivalents thereof.