JPS5494414A - Method of hot-forming polygonal pipe - Google Patents

Method of hot-forming polygonal pipe

Info

Publication number
JPS5494414A
JPS5494414A JP115278A JP115278A JPS5494414A JP S5494414 A JPS5494414 A JP S5494414A JP 115278 A JP115278 A JP 115278A JP 115278 A JP115278 A JP 115278A JP S5494414 A JPS5494414 A JP S5494414A
Authority
JP
Japan
Prior art keywords
pipe
expansion coefficient
core tool
sheet
heat
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
JP115278A
Other languages
Japanese (ja)
Inventor
Takeshi Suzumura
Sozo Saito
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 JP115278A priority Critical patent/JPS5494414A/en
Publication of JPS5494414A publication Critical patent/JPS5494414A/en
Pending legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

PURPOSE:To prevent the generation of defects on cold-worked polygonal pipes along with a proper control of the dimension and shape of the heat treated pipe by applying the difference in the expansion coefficient between a foil of material identical to the pipe and a core tool of greater expansion coefficient which both are arranged thereinside in heat-treating the pipe for stress removal. CONSTITUTION:Inside a pipe 1 to be heat-treated, a foil-like sheet made of material identical in quality or expansion coefficient identical to the pipe 1 is provided and in such manner that one end thereof is connected to the other end along te axis of thereof. A core tool 3 made of material of greater expansion coefficient than the pipe is inserted into the pipe 1 and the sheet 2. A pin 4 is run trough a hole 5 on the pipe 1 and screwed down into the core tool 3. The core tool 3 is put to the sheet 2 at the corner section while the corner section of the pipe 1 is expanded to a high temperature finish size and then fixed. The pipe is retained for a long period of time under such a condition. In this manner, it is finished into a polygonal pipe with a desired shape and size free from defect at a high accuracy.
JP115278A 1978-01-11 1978-01-11 Method of hot-forming polygonal pipe Pending JPS5494414A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP115278A JPS5494414A (en) 1978-01-11 1978-01-11 Method of hot-forming polygonal pipe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP115278A JPS5494414A (en) 1978-01-11 1978-01-11 Method of hot-forming polygonal pipe

Publications (1)

Publication Number Publication Date
JPS5494414A true JPS5494414A (en) 1979-07-26

Family

ID=11493452

Family Applications (1)

Application Number Title Priority Date Filing Date
JP115278A Pending JPS5494414A (en) 1978-01-11 1978-01-11 Method of hot-forming polygonal pipe

Country Status (1)

Country Link
JP (1) JPS5494414A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01230724A (en) * 1988-03-09 1989-09-14 Hitachi Ltd Heat treatment method for heat exchanger

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01230724A (en) * 1988-03-09 1989-09-14 Hitachi Ltd Heat treatment method for heat exchanger

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