Title:
METHOD OF SEQUENTIALLY MANUFACTURING HOLLOW KNOCK PINS
Document Type and Number:
WIPO Patent Application WO/1995/008411
Kind Code:
A1
Abstract:
To reduce the man-day in the pressing of hollow knock pins. The method comprises the steps of deep-drawing a plate material A-0 to shape the material into a predetermined shape A-1, ironing the resultant work at a low draft, punching the bottom portion in the same die by the same ironing punch (9), punching a flange portion to shape the work into a cylinder A-3, and compression-molding both end surfaces and outer circumferential portion into cone, by molds (15, 16, 17, 18). The steps are sequentially carried out.
Inventors:
NAGAMORI HACHIRO (JP)
Application Number:
PCT/JP1993/001348
Publication Date:
March 30, 1995
Filing Date:
September 20, 1993
Export Citation:
Assignee:
NAGAMORI HACHIRO (JP)
International Classes:
B21D22/20; B21D28/02; B21D35/00; (IPC1-7): B21D35/00; B21D19/00; B21D28/02
Foreign References:
| JPH01107923A | 1989-04-25 | |||
| JPS5626492B2 | 1981-06-18 |
Other References:
See also references of EP 0722792A4
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