Title:
PRODUCTION OF METAL CYLINDRICAL BODY
Document Type and Number:
Japanese Patent JP3445526
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a production method of an inexpensive metal cylindrical body not generating a crack to a collar part/large diameter part and excellent in practicality/productivity, which is structured such that the metal cylindrical body has a small diameter part on the upper section the large diameter part.
SOLUTION: A production device and method are constituted so that a first punch having a downward spreading part with a diameter increased gradually downward is inserted from a lower opening part of a metal cylindrical body 3 so as to form a primary diameter expanded part of a tapered shape, after the first punch is pulled out from the cylindrical body 3, a final punch 12 to form a large diameter part is inserted from the lower opening part of the cylindrical body 3, the large diameter part is formed to the cylindrical body 3. When the large diameter part is formed to the cylindrical body 3 by the final punch 12, a collar part is formed to a lower part of the cylindrical body 3 by pressing/ holding the lower part of the primary diameter expanded part.
Inventors:
Toshio Odashima
Application Number:
JP11168499A
Publication Date:
September 08, 2003
Filing Date:
April 20, 1999
Export Citation:
Assignee:
Odajima Kimono Manufacturing Co., Ltd.
International Classes:
A47J41/02; B21D19/08; B21D22/26; B21D39/20; B21D41/02; B21D51/18; (IPC1-7): B21D39/20; B21D19/08; B21D41/02; B21D51/18
Domestic Patent References:
| JP7256346A | ||||
| JP60222607A | ||||
| JP732073A | ||||
| JP4965974A | ||||
| JP62296923A | ||||
| JP232317U | ||||
| JP216229U |
Attorney, Agent or Firm:
Tsuyoshi Yoshii (1 person outside)