JPS56168921A - Manufacture of washer - Google Patents

Manufacture of washer

Info

Publication number
JPS56168921A
JPS56168921A JP15114979A JP15114979A JPS56168921A JP S56168921 A JPS56168921 A JP S56168921A JP 15114979 A JP15114979 A JP 15114979A JP 15114979 A JP15114979 A JP 15114979A JP S56168921 A JPS56168921 A JP S56168921A
Authority
JP
Japan
Prior art keywords
washer
hole
recess part
circumference
open hole
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
JP15114979A
Other languages
Japanese (ja)
Inventor
Kimiaki Sawada
Hirotoshi Takeda
Shinzo Anazawa
Kazuhiko Yoshikawa
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.)
Sumitomo Metal Mining Co Ltd
NEC Corp
Original Assignee
Sumitomo Metal Mining Co Ltd
NEC Corp
Nippon Electric 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 Sumitomo Metal Mining Co Ltd, NEC Corp, Nippon Electric Co Ltd filed Critical Sumitomo Metal Mining Co Ltd
Priority to JP15114979A priority Critical patent/JPS56168921A/en
Publication of JPS56168921A publication Critical patent/JPS56168921A/en
Pending legal-status Critical Current

Links

Landscapes

  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • ing And Chemical Polishing (AREA)

Abstract

PURPOSE: To manufacture a washer provided with a prescribed shape and an inside-staged hole from a metallic sheet with a good accuracy, by forming a recess part in one side of a metallic sheet, by perforating an open hole in the bottom of the recess part, by applying a coining work in order to reform the shape of the hole, and by blanking the outer profile of the washer.
CONSTITUTION: An etching process is applied to one side of a metallic sheet 8 so as to form a recess part 9 with a precesibed depth and a diameter equal to the prescribed diameter of larger one of two-staged hole to be perforated later. The bottom of the recess part 9 is perforated along a circumference smaller than the circumference of the recess part 9 so as to form an open hole. A corining work is then applied along the circumference of the recess part 9 in order to reform the shape of the circumference of the open hole on the bottom side. By this coining work, an excess metal spreading inward in the open hole is cut off, and the shape of the open hole is reformed. Finally, the outer profile is blanked in order to separate a washer 10 from the metallic sheet 8. According to the present method, the washer 10 provided with a stage facing to an outer side in the inside of the hole is manufactured with good dimensional accuracy. This washer 10 is used for a part of a microwave device, etc.
COPYRIGHT: (C)1981,JPO&Japio
JP15114979A 1979-11-21 1979-11-21 Manufacture of washer Pending JPS56168921A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15114979A JPS56168921A (en) 1979-11-21 1979-11-21 Manufacture of washer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15114979A JPS56168921A (en) 1979-11-21 1979-11-21 Manufacture of washer

Publications (1)

Publication Number Publication Date
JPS56168921A true JPS56168921A (en) 1981-12-25

Family

ID=15512429

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15114979A Pending JPS56168921A (en) 1979-11-21 1979-11-21 Manufacture of washer

Country Status (1)

Country Link
JP (1) JPS56168921A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05329568A (en) * 1992-06-01 1993-12-14 Takeda Kogyo Kk Manufacture of washer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05329568A (en) * 1992-06-01 1993-12-14 Takeda Kogyo Kk Manufacture of washer

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