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JPS57152326A - Manufacture of double tube - Google Patents

Manufacture of double tube

Info

Publication number
JPS57152326A
JPS57152326A JP3729481A JP3729481A JPS57152326A JP S57152326 A JPS57152326 A JP S57152326A JP 3729481 A JP3729481 A JP 3729481A JP 3729481 A JP3729481 A JP 3729481A JP S57152326 A JPS57152326 A JP S57152326A
Authority
JP
Japan
Prior art keywords
tube
expanding
inner tube
point
martensitic transformation
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
JP3729481A
Other languages
Japanese (ja)
Other versions
JPS6023933B2 (en
Inventor
Toshio Yoshida
Shozo Matsuda
Shigetomo Matsui
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.)
Kawasaki Heavy Industries Ltd
Kawasaki Motors Ltd
Original Assignee
Kawasaki Heavy Industries Ltd
Kawasaki Jukogyo KK
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 Kawasaki Heavy Industries Ltd, Kawasaki Jukogyo KK filed Critical Kawasaki Heavy Industries Ltd
Priority to JP3729481A priority Critical patent/JPS6023933B2/en
Publication of JPS57152326A publication Critical patent/JPS57152326A/en
Publication of JPS6023933B2 publication Critical patent/JPS6023933B2/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P11/00—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for 
    • B23P11/02—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for  by first expanding and then shrinking or vice versa, e.g. by using pressure fluids; by making force fits
    • B23P11/025—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for  by first expanding and then shrinking or vice versa, e.g. by using pressure fluids; by making force fits by using heat or cold

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Abstract

PURPOSE:To manufacture an excellent auto-fretting double tube that heightens grade of fit and prevents stress corrosion cracking by expanding an inner tube at a temperature above Md point, reducing after plastic deformation, cooling at a temperature below Ms point and expanding with martensitic transformation. CONSTITUTION:A material that generates work induced martensite is selected for an inner tube, and the inner tube is inserted into an outer tube. Under this condition, the outer tube is expanded through expanding of the inner tube causing yielding by hydraulic expanding at a temperature above Md temperature. At a specified diameter expanding stress is released and the tube is reduced preventing occurrence of martensitic transformation. Next, under this condition, the inner tube is cooled at a temperature below Ms point and expanded giving rise to martensitic transformation in the inner tube. Thus, an auto-fretting double tube having high grade of fit due to difference in diameter between inner and outer tubes can be obtained.
JP3729481A 1981-03-17 1981-03-17 Double pipe manufacturing method Expired JPS6023933B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3729481A JPS6023933B2 (en) 1981-03-17 1981-03-17 Double pipe manufacturing method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3729481A JPS6023933B2 (en) 1981-03-17 1981-03-17 Double pipe manufacturing method

Publications (2)

Publication Number Publication Date
JPS57152326A true JPS57152326A (en) 1982-09-20
JPS6023933B2 JPS6023933B2 (en) 1985-06-10

Family

ID=12493680

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3729481A Expired JPS6023933B2 (en) 1981-03-17 1981-03-17 Double pipe manufacturing method

Country Status (1)

Country Link
JP (1) JPS6023933B2 (en)

Also Published As

Publication number Publication date
JPS6023933B2 (en) 1985-06-10

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