JPS56156768A - Surface treatment of punch to be used for forming cross-recessed hole on screw head - Google Patents
Surface treatment of punch to be used for forming cross-recessed hole on screw headInfo
- Publication number
- JPS56156768A JPS56156768A JP5888080A JP5888080A JPS56156768A JP S56156768 A JPS56156768 A JP S56156768A JP 5888080 A JP5888080 A JP 5888080A JP 5888080 A JP5888080 A JP 5888080A JP S56156768 A JPS56156768 A JP S56156768A
- Authority
- JP
- Japan
- Prior art keywords
- punch
- recessed hole
- forming
- forming cross
- cross
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Physical Vapour Deposition (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
PURPOSE: To prevent exfoliation of covering layer and generation of breakge so that the punch is improved in its wear resistance, etc., by covering the surface of punch with carbides, nitrides, borides, etc., of specified metals after the surface of cross-recessed hole forming punch is formed in a prescribed form.
CONSTITUTION: A plural number of punches having male molds for forming cross- recessed hole are barrel-polished together and a moderate roundness is given to the corner part and edge part of the male mold for forming cross-recessed hole, and at the same time, the surface roughness of the flat part of male mold is made good. By this barrel-polishing, the sectional curvatures of projected edge parts forming the male molds are made evenly within a prescribed range. The surface of punch is covered with ≥1 kinds of carbides, nitrides, borides of Ti, V, Cr, Nb, and W. In this way, punches for forming cross-recessed hole on screw head which does not cause wearing accompanied with the exfoliation of coating layer and tipping of breakage caused by microcracks, can be obtained.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5888080A JPS56156768A (en) | 1980-05-01 | 1980-05-01 | Surface treatment of punch to be used for forming cross-recessed hole on screw head |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5888080A JPS56156768A (en) | 1980-05-01 | 1980-05-01 | Surface treatment of punch to be used for forming cross-recessed hole on screw head |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS56156768A true JPS56156768A (en) | 1981-12-03 |
Family
ID=13097069
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5888080A Pending JPS56156768A (en) | 1980-05-01 | 1980-05-01 | Surface treatment of punch to be used for forming cross-recessed hole on screw head |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56156768A (en) |
-
1980
- 1980-05-01 JP JP5888080A patent/JPS56156768A/en active Pending
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