JPS56105834A - Necking method for pipe - Google Patents

Necking method for pipe

Info

Publication number
JPS56105834A
JPS56105834A JP573480A JP573480A JPS56105834A JP S56105834 A JPS56105834 A JP S56105834A JP 573480 A JP573480 A JP 573480A JP 573480 A JP573480 A JP 573480A JP S56105834 A JPS56105834 A JP S56105834A
Authority
JP
Japan
Prior art keywords
pipe body
main pipe
mandrel
hydraulic cylinder
giving
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
JP573480A
Other languages
Japanese (ja)
Inventor
Hiroshi Asao
Keiichi Nakamura
Kenichi Okada
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 JP573480A priority Critical patent/JPS56105834A/en
Publication of JPS56105834A publication Critical patent/JPS56105834A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To make generation of plastic buckling possible to be effectively prevented, by inserting the pipe end into a cavity of the die, and by inserting a freely rotatable mandrel into a pipe for giving a load to the inner surface of the deformed part.
CONSTITUTION: A freely rotatably mandrel 6 is inserted into the main pipe body 1, which is then grasped by a holding jig 7; after that, an unillustrated motor rotates the main pipe body 1 in the arrowed direction A. On the other hand, said mandrel 6 is connected to a hydraulic cylinder 8. Next, an externally installed hydraulic cylinder is driven to push the main pipe body 1 to a die 4 provided with a cavity 5 shaped so as to be fittable to the shape of the formed product, in the arrowed direction B through the holding jig 7. After giving a deformation to the main pipe body 1 to an extent uncausable a buckling, the mandrel 6 is pressed to the inner surface of the necking part 2 of the main pipe body 1, by the hydraulic cylinder 8.
COPYRIGHT: (C)1981,JPO&Japio
JP573480A 1980-01-23 1980-01-23 Necking method for pipe Pending JPS56105834A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP573480A JPS56105834A (en) 1980-01-23 1980-01-23 Necking method for pipe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP573480A JPS56105834A (en) 1980-01-23 1980-01-23 Necking method for pipe

Publications (1)

Publication Number Publication Date
JPS56105834A true JPS56105834A (en) 1981-08-22

Family

ID=11619324

Family Applications (1)

Application Number Title Priority Date Filing Date
JP573480A Pending JPS56105834A (en) 1980-01-23 1980-01-23 Necking method for pipe

Country Status (1)

Country Link
JP (1) JPS56105834A (en)

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