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 18, 2003
Grant Date -
N/A
app pub date -
Mar 20, 2001
filing date -
Jul 28, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
According to the invention, an inward collar is integrally shaped on the inner periphery of a cylindrical boss portion. The inward collar is raisedly shaped in the axial direction on the inner periphery of the cylindrical boss portion by a top pattern tool having an ironing punch, and a bottom pattern tool having an ironing punch. The ironing process of forming the inward collar is repeated several times by using plural dies to finish the final shape.
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