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 head

Info

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
Application number
JP5888080A
Other languages
Japanese (ja)
Inventor
Tamio Hirahara
Kenichi Tamura
Tadashi Takano
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mazda Motor Corp
Original Assignee
Mazda Motor Corp
Toyo Kogyo Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mazda Motor Corp, Toyo Kogyo Co Ltd filed Critical Mazda Motor Corp
Priority to JP5888080A priority Critical patent/JPS56156768A/en
Publication of JPS56156768A publication Critical patent/JPS56156768A/en
Pending legal-status Critical Current

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
JP5888080A 1980-05-01 1980-05-01 Surface treatment of punch to be used for forming cross-recessed hole on screw head Pending JPS56156768A (en)

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)

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