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Patent Searching and Data


Title:
SHAPED ARTICLE OF SHEET METAL HAVING PERIPHERAL WALL AND METHOD OF INCREASING PERIPHERAL WALL THICKNESS
Document Type and Number:
WIPO Patent Application WO/1998/001246
Kind Code:
A1
Abstract:
A shaped article sheet metal suitable for piston parts, whose peripheral wall formed integral with a base plate is four or more times thicker in axial directions and two or more times thicker in radial directions than the base plate. A wall thickening method comprises forming a base plate and a thickened peripheral wall by pressing a first forming roller and a second forming roller in order against an outer peripheral portion of a disk-shaped blank of sheet metal interposed by a rotary die while revolving the blank. A first forming process is composed of a plurality of subprocesses. Between a preceding subprocess and a subsequent subprocess, an annular bottom surface of a forming surface of a first forming roller is made greater in radius of curvature than that of a first forming roller used in the preceding subprocess, and a pair of annular forming surfaces on a forming surface of a first forming roller used in a subsequent subprocess are made smaller in an open angle than that of a first forming roller used in a preceding subprocess.

Inventors:
KANEMITSU TOSHIAKI (JP)
KANEMITSU SHUJI (JP)
NISHIOKA HIRONORI (JP)
Application Number:
PCT/JP1996/001927
Publication Date:
January 15, 1998
Filing Date:
July 10, 1996
Export Citation:
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Assignee:
KANEMITSU KK (JP)
KANEMITSU TOSHIAKI (JP)
KANEMITSU SHUJI (JP)
NISHIOKA HIRONORI (JP)
International Classes:
B21D22/14; B21D53/26; B21H1/00; B21H1/04; B21K1/28; B21K1/42; B21K21/00; B21K23/04; F16S1/04; B21H7/18; (IPC1-7): B21H1/04; B21K1/42; B21D53/26
Foreign References:
JPS6430970A1989-02-01
JPH03207541A1991-09-10
JPS6363544A1988-03-19
Attorney, Agent or Firm:
Suzuye, Koichi (Room 607 2-4, Komatubaracho, Kita-k, Osaka-shi Osaka 530, JP)
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