JPS5487664A - Stretch bending process - Google Patents

Stretch bending process

Info

Publication number
JPS5487664A
JPS5487664A JP15556677A JP15556677A JPS5487664A JP S5487664 A JPS5487664 A JP S5487664A JP 15556677 A JP15556677 A JP 15556677A JP 15556677 A JP15556677 A JP 15556677A JP S5487664 A JPS5487664 A JP S5487664A
Authority
JP
Japan
Prior art keywords
yield strength
spring back
back amount
plate
curve
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
JP15556677A
Other languages
Japanese (ja)
Other versions
JPS5935300B2 (en
Inventor
Shigeyasu Ueno
Masanobu Ueda
Tatsuo Nakane
Masaru Kobayashi
Yoshihiro Osumi
Toshihiko Miyama
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP15556677A priority Critical patent/JPS5935300B2/en
Publication of JPS5487664A publication Critical patent/JPS5487664A/en
Publication of JPS5935300B2 publication Critical patent/JPS5935300B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Bending Of Plates, Rods, And Pipes (AREA)

Abstract

PURPOSE: To provide products of high accuracy, a material to be treated is first stretched with a force greater than its yield strength to provide a predetermined elongation and then bent under this condition.
CONSTITUTION: In the process of force application greater than yield strength, a tensile force is applied to material until a predetermined elongation is reached. This process reduces variations in neutral axis positions and results in reduced variation in spring back amount. For example, a tensile force greater than yield strength of a plate material is applied to the plate until elongation is reached to 1%, and under this tensile load the plate is bent, then the load is removed. In the figure, curve 1 represents the result of conventional process, curve 2 the invetion, which clearly indicates the decreased variation in spring back amount. This process is applicable in a different ambient temperature or process rate, giving similarly decreased spring back amount.
COPYRIGHT: (C)1979,JPO&Japio
JP15556677A 1977-12-26 1977-12-26 Tensile bending method Expired JPS5935300B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15556677A JPS5935300B2 (en) 1977-12-26 1977-12-26 Tensile bending method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15556677A JPS5935300B2 (en) 1977-12-26 1977-12-26 Tensile bending method

Publications (2)

Publication Number Publication Date
JPS5487664A true JPS5487664A (en) 1979-07-12
JPS5935300B2 JPS5935300B2 (en) 1984-08-28

Family

ID=15608839

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15556677A Expired JPS5935300B2 (en) 1977-12-26 1977-12-26 Tensile bending method

Country Status (1)

Country Link
JP (1) JPS5935300B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007105756A (en) * 2005-10-13 2007-04-26 Hitachi Ltd Method and apparatus for tensile bending of material to be molded

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6306410B2 (en) * 2014-04-17 2018-04-04 日本メクトロン株式会社 Flexible printed board manufacturing method, board manufacturing jig, and board manufacturing apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007105756A (en) * 2005-10-13 2007-04-26 Hitachi Ltd Method and apparatus for tensile bending of material to be molded

Also Published As

Publication number Publication date
JPS5935300B2 (en) 1984-08-28

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