Metal deforming – By use of closed-die and coacting work-forcer – Forcing work into or within closed die; e.g. – forging
Patent
1998-01-12
1999-08-03
Larson, Lowell A.
Metal deforming
By use of closed-die and coacting work-forcer
Forcing work into or within closed die; e.g., forging
29894362, B21D 5326
Patent
active
059310421
ABSTRACT:
The present invention relates to a method of forming a key portion on a sheet metal member, the key portion being useful in coupling of a shaft to a member such as a pulley used in an automobile. According to the method of the invention, an inner metal part of a cylindrical portion of the sheet metal member is pressed in the axial direction so that the inner metal part is removed away and a predetermined place of the inner metal part remains, the remaining metal part being used as the key portion. Pressing the inner metal part in the axial direction of the cylindrical portion can be conducted by a pressing process in which a pressing die is moved in the axial direction of the cylindrical portion. A key portion can be easily formed on the cylindrical portion, and an inner flange can be formed together with the key portion. Therefore, a member having a cylindrical portion which has a key portion and an inner flange can be provided without using a casting process, as a lightweight sheet metal member which is tough and economical.
REFERENCES:
patent: 2027922 (1936-01-01), McNaught
patent: 4450704 (1984-05-01), Schaeffler et al.
patent: 5195241 (1993-03-01), Bradfield
Fujii Naoki
Harada Kunihiro
Kanemitsu Toshiaki
Kabushiki Kaisha Kanemitsu
Larson Lowell A.
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