JPH04127928A - Method for forging hollow part having undercut - Google Patents

Method for forging hollow part having undercut

Info

Publication number
JPH04127928A
JPH04127928A JP24890790A JP24890790A JPH04127928A JP H04127928 A JPH04127928 A JP H04127928A JP 24890790 A JP24890790 A JP 24890790A JP 24890790 A JP24890790 A JP 24890790A JP H04127928 A JPH04127928 A JP H04127928A
Authority
JP
Japan
Prior art keywords
hollow part
undercut
blank material
wall
forming
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.)
Granted
Application number
JP24890790A
Other languages
Japanese (ja)
Other versions
JP2884435B2 (en
Inventor
Toshikatsu Koike
Yutaka Yamagata
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.)
Yamaha Motor Co Ltd
Original Assignee
Yamaha Motor 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 Yamaha Motor Co Ltd filed Critical Yamaha Motor Co Ltd
Priority to JP24890790A priority Critical patent/JP2884435B2/en
Publication of JPH04127928A publication Critical patent/JPH04127928A/en
Application granted granted Critical
Publication of JP2884435B2 publication Critical patent/JP2884435B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

PURPOSE: To prevent cracks by forming by forcibly pressing the hollow part on the blank material while completely restricting the outer shape of the blank material, next forming the undercut by subjecting the inner wall of hollow part to compress-deforming.
CONSTITUTION: The hollow part having undercut is manufactured so the processes composed of the process that the blank material M is set to the outer die 1, and the total outer shape is restricted and held, the process that the 1st forming die 4 is forcibly pressed to the blank material M restricted and held, and the hollow part(h)is formed, and the process that the 2nd forming die 4 is inserted in this hollow part (h) and also forcibly presses toward the inner wall of the hollow part, this inner wall is compress-formed and the undercut is formed. Therefore, the cracks generated nearby the undercut part can be prevented.
COPYRIGHT: (C)1992,JPO&Japio
JP24890790A 1990-09-20 1990-09-20 Forging method for hollow parts with undercut Expired - Fee Related JP2884435B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP24890790A JP2884435B2 (en) 1990-09-20 1990-09-20 Forging method for hollow parts with undercut

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24890790A JP2884435B2 (en) 1990-09-20 1990-09-20 Forging method for hollow parts with undercut

Publications (2)

Publication Number Publication Date
JPH04127928A true JPH04127928A (en) 1992-04-28
JP2884435B2 JP2884435B2 (en) 1999-04-19

Family

ID=17185205

Family Applications (1)

Application Number Title Priority Date Filing Date
JP24890790A Expired - Fee Related JP2884435B2 (en) 1990-09-20 1990-09-20 Forging method for hollow parts with undercut

Country Status (1)

Country Link
JP (1) JP2884435B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9770753B2 (en) 2015-07-13 2017-09-26 Toyota Jidosha Kabushiki Kaisha Surface roughening apparatus for metal stock and surface roughening method for metal stock

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9770753B2 (en) 2015-07-13 2017-09-26 Toyota Jidosha Kabushiki Kaisha Surface roughening apparatus for metal stock and surface roughening method for metal stock

Also Published As

Publication number Publication date
JP2884435B2 (en) 1999-04-19

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees