Title:
METHOD OF MANUFACTURING WHEEL DISC
Document Type and Number:
Japanese Patent JP2004330303
Kind Code:
A
Abstract:
To provide a simplified manufacturing method of a wheel disc for an automobile which can improve a yield.
In the method of manufacturing the wheel disc, a rectangular metal batten plate with a scheduled uniform thickness is cold-rolled to a partial annulus by a conical roll. At this time, the reduction of the thickness at the outer surface of the bent batten plate is at least 20%, and a circumference angle of the partial annulus is 130° to 310°, preferably 180°. Then a conical blank is formed by roll bending processing, and the ends of the blank are welded with each other. Then the bottom part of the disc is formed by plastic working.
Inventors:
ATTS BRUNO
Application Number:
JP2004132930A
Publication Date:
November 25, 2004
Filing Date:
April 28, 2004
Export Citation:
Assignee:
MICHELIN KRONPRINZ WERKE GMBH
International Classes:
B21B1/22; B21D11/20; B21D22/26; B21D53/26; B60B3/04; (IPC1-7): B21D53/26; B21B1/22; B21D11/20; B21D22/26; B60B3/04
Attorney, Agent or Firm:
Shoichi Okuyama
Arihara Koichi
Matsushima Tetsuo
Arihara Koichi
Matsushima Tetsuo