Method of manufacturing socket punches

Patent metadata

Field	Value
Publication number	US-10987745-B2
Application number	US-201916258032-A
Country	US
Kind code	B2
Filing date	Jan 25, 2019
Priority date	Jan 25, 2019
Publication date	Apr 27, 2021
Grant date	Apr 27, 2021

Abstract

A method of manufacturing a punch, such as a socket punch, using wire EDM with at least six steps. The method involves forming a blank, holding the blank with an adapter, machining grooves in the blank, manufacturing a side relief of a working portion using wire EDM, milling the working portion to a final size, and forming a cone point on the end of the working portion. The method allows the punch to be manufactured more quickly and from a CAD model, therefore removing the need for over-specialized equipment and improving manufacturing times.

First claim

What is claimed is:

1. A method of manufacturing a punch from a blank having first and second halves, wherein the second half has a second end, the method comprising:
holding the blank;
forming grooves in the second half with an electric discharge machine (“EDM”), wherein the grooves have respective groove profiles and extend to the second end;
forming a hex portion with the EDM machine in the blank in a portion of the second half, wherein respective groove portions and groove remnants of the groove profiles remain after forming the hex portion with the EDM machine, and wherein the groove portions are disposed between the hex portion and the first half, and the groove remnants are disposed adjacent to the second end;
milling the hex portion to obtain a final hex portion size; and
machining a cone point at the second end.

2. The method according to claim 1 , further comprising forming a transition portion between the groove portions and the hex portion.

3. The method according to claim 1 , wherein the EDM machine includes a wire having a diameter of 0.010 inches.

4. The method according to claim 1 , wherein the blank includes a Crucible Particle Metallurgy (“CPM”) T-15 steel material.

5. The method according to claim 1 , wherein the EDM machine includes a wire and wherein the step of forming grooves includes angling the wire at 1.25-2.00 degrees relative to an axis of the blank.

6. The method according to claim 1 , further comprising stress relieving the punch.

7. The method according to claim 6 , wherein the step of stress relieving the punch includes heating the punch to 1025° F. for two hours.

8. The method according to claim 1 , further comprising surface coating the punch.

9. The method according to claim 8 , wherein the step of surface coating the punch includes coating the punch with aluminum chromium nitride.

10. The method according to claim 8 , wherein the step of surface coating the punch includes coating the punch with titanium nitride.

11. A method of manufacturing a punch comprising:
forming a blank having first and second halves, wherein the second half has a second end;
machining a geometry of the blank with an EDM machine and forming grooves having respective groove profiles in the second half and that extend to the second end;
milling a hex portion in the blank in a portion of the second half to obtain a final hex portion size, wherein respective groove portions and groove remnants of the groove profiles remain after milling the hex portion, the groove portions are disposed between the hex portion and the first half, and the groove remnants are disposed adjacent to the second end; and
machining a cone point at the second end.

12. The method according to claim 11 , wherein the EDM machine includes a wire and wherein the step of forming the grooves includes angling the wire at an angle of 1.25-2.00 degrees to the axis of the blank.

13. The method according to claim 11 , wherein the step of machining a geometry of the blank includes forming the hex portion with the EDM machine.

14. The method according to claim 11 , further comprising holding the blank with an adapter.

15. The method according to claim 11 , wherein the step of machining a geometry of the blank includes forming a transition portion between the groove portions and the hex portion.

16. The method according to claim 11 , further comprising stress relieving the punch.

17. The method according to claim 16 , wherein the step of stress relieving the punch includes heating the punch to 1025° F. for two hours.

18. The method according to claim 11 , further comprising surface coating the punch.

19. The method according to claim 18 , wherein the step of surface coating the punch includes coating the punch with one of aluminum chromium nitride and titanium nitride.

Assignees

• Snap On Tools Corp

Inventors

• Eggert Daniel M
• Wente Steven R
• Mcgreal David G
• Arendt Jeffrey M

Classifications

• B23H9/12

  Forming parts of complementary shape, e.g. punch-and-die · CPC title

• B21D37/01 Primary

  Selection of materials · CPC title

• B23H7/02 Primary

  Wire-cutting · CPC title

• B23H5/04 Primary

  Electrical discharge machining combined with mechanical working · CPC title

• B21D28/34

  Perforating tools; Die holders · CPC title