JPS57206520A - Cylindrical body forming method - Google Patents

Cylindrical body forming method

Info

Publication number
JPS57206520A
JPS57206520A JP8887781A JP8887781A JPS57206520A JP S57206520 A JPS57206520 A JP S57206520A JP 8887781 A JP8887781 A JP 8887781A JP 8887781 A JP8887781 A JP 8887781A JP S57206520 A JPS57206520 A JP S57206520A
Authority
JP
Japan
Prior art keywords
punch
cylindrical body
diameter part
degree
forming
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
JP8887781A
Other languages
Japanese (ja)
Inventor
Kotaro Chiba
Tadao Iwadate
Masabumi Miyashita
Takao Sakamichi
Mitsuo Horiuchi
Mitsugi Sasaki
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.)
NIPPON SEIKOSHO KK
Japan Steel Works Ltd
Original Assignee
NIPPON SEIKOSHO KK
Japan Steel Works 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 NIPPON SEIKOSHO KK, Japan Steel Works Ltd filed Critical NIPPON SEIKOSHO KK
Priority to JP8887781A priority Critical patent/JPS57206520A/en
Publication of JPS57206520A publication Critical patent/JPS57206520A/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
    • B21D39/08—Tube expanders
    • B21D39/20—Tube expanders with mandrels, e.g. expandable

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)

Abstract

PURPOSE:To improve a degree of a true circle and a degree of a cylinder of a cylindrical body raw material, and its yield, by forming it by use of a multistage punch to which a punch having roundness on its outside circumference and also a diameter corresponding to the inside diameter of the cylindrical body raw material has been connected coaxially. CONSTITUTION:Press forming is executed by pushing a punch 4 into the inside diameter part of a cylindrical body raw material 2 from the upper part, or drawing it out. In this case, at first, the inside diameter part of the cylindrical body is formed by a punch 4a of the lower side, a part which has been a short diameter part at first becomes a long diameter part, and a part which has been a long diameter part at first becomes a short diameter part. Since forming by an upper side punch 4b is execured immediately after the lower side punch 4a, however, flow of a material in case if forming by the lower side punch 4a is limited by the succedding upper side punch 4b, and both a degree of a true circle and a degree of a cylinder are improved remarkably.
JP8887781A 1981-06-11 1981-06-11 Cylindrical body forming method Pending JPS57206520A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8887781A JPS57206520A (en) 1981-06-11 1981-06-11 Cylindrical body forming method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8887781A JPS57206520A (en) 1981-06-11 1981-06-11 Cylindrical body forming method

Publications (1)

Publication Number Publication Date
JPS57206520A true JPS57206520A (en) 1982-12-17

Family

ID=13955225

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8887781A Pending JPS57206520A (en) 1981-06-11 1981-06-11 Cylindrical body forming method

Country Status (1)

Country Link
JP (1) JPS57206520A (en)

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