Sheet metal member and method of manufacturing the member
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Nov 26, 2002
Grant Date -
N/A
app pub date -
Feb 23, 2001
filing date -
Jul 28, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
In the present invention, a thin and disc-shaped blank made of steel plate is used. The present invention provides a method of manufacturing a sheet metal member comprising a circular base plate, and an annular projection bulged from at least one surface of the base plate so as to be concentric therewith, which can be easily and cheaply produced without loss of material, by only a few steps. A blank having an outer peripheral portion which has been thickened by a former step, is rotated while it is held between an upper and lower dies. At the same time, an edge angle portion of an outer peripheral surface of a drawing roller is pressed against one surface of the thickened outer peripheral portion which extrudes outwardly from the upper die of the blank, and the drawing roller is rotated, while it is moved in the direction of the center of the blank, and the thickened outer peripheral portion is drawn so as to make it think, thereby bulging the annular projection axially.
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