JPS5758945A - Manufacture of long hollow cylindrical formed part - Google Patents

Manufacture of long hollow cylindrical formed part

Info

Publication number
JPS5758945A
JPS5758945A JP13227480A JP13227480A JPS5758945A JP S5758945 A JPS5758945 A JP S5758945A JP 13227480 A JP13227480 A JP 13227480A JP 13227480 A JP13227480 A JP 13227480A JP S5758945 A JPS5758945 A JP S5758945A
Authority
JP
Japan
Prior art keywords
hollow cylindrical
manufacture
formed part
long hollow
cylindrical body
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
JP13227480A
Other languages
Japanese (ja)
Other versions
JPS5933463B2 (en
Inventor
Masahiro Yokota
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.)
Komatsu Ltd
Original Assignee
Komatsu 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 Komatsu Ltd filed Critical Komatsu Ltd
Priority to JP13227480A priority Critical patent/JPS5933463B2/en
Publication of JPS5758945A publication Critical patent/JPS5758945A/en
Publication of JPS5933463B2 publication Critical patent/JPS5933463B2/en
Expired legal-status Critical Current

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  • Forging (AREA)

Abstract

PURPOSE: To manufacture a long hollow cylindrical formed part through stamping without causing breakage by forming a bottomed hollow cylindrical body having a bottom part of small diameter, thereafter removing the bottom and executing forward extrusion through inverting the same.
CONSTITUTION: A blank material 1 is formed by backward extrusion to a bottomed hollow cylindrical body 2 having a small diameter part 3 of diameter Do' and in- length Lo' in the bottom side outer circumference. After making this to a hollow cylindrical body 5 through removing the bottom 4 by blanking, it is inversed and put into a die 6 and forward extruded by a ring punch 7 to manufacture a long hollow cylindrical formed part 8. In this method, no breakage is caused in the formed part by forward extrusion process even when the reduction rate of area is high.
COPYRIGHT: (C)1982,JPO&Japio
JP13227480A 1980-09-25 1980-09-25 Manufacturing method for long hollow cylindrical molded products Expired JPS5933463B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13227480A JPS5933463B2 (en) 1980-09-25 1980-09-25 Manufacturing method for long hollow cylindrical molded products

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13227480A JPS5933463B2 (en) 1980-09-25 1980-09-25 Manufacturing method for long hollow cylindrical molded products

Publications (2)

Publication Number Publication Date
JPS5758945A true JPS5758945A (en) 1982-04-09
JPS5933463B2 JPS5933463B2 (en) 1984-08-16

Family

ID=15077442

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13227480A Expired JPS5933463B2 (en) 1980-09-25 1980-09-25 Manufacturing method for long hollow cylindrical molded products

Country Status (1)

Country Link
JP (1) JPS5933463B2 (en)

Also Published As

Publication number Publication date
JPS5933463B2 (en) 1984-08-16

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