Method of forming an inner flange on a sheet metal member having a cylindrical portion
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United States of America Patent
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Aug 17, 1999
Grant Date -
N/A
app pub date -
Jan 12, 1998
filing date -
Jan 27, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to a method of forming an inner flange on a sheet metal member having a cylindrical portion with an inner flange 3 required in coupling of a shaft such as a pulley used in an automobile. The axial length of a boss formed on the sheet metal member is reduced by pressing the boss in the axial direction of the boss, and an excess portion produced as a result of the reduction of the axial length of the boss is gathered in one place in the axial direction of the boss, for example, the end in the axial direction of the boss to project inwardly into the inside of the boss, so that the inner flange is formed by the projected excess portion. A step of gathering the excess portion produced as a result of the reduction of the axial length of the boss can be conducted by a pressing process in which a pressing die is moved in the axial direction of the boss.
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