Method of and apparatus for forming a hollow step profiled shaft
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United States of America Patent
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Issued Date -
Mar 13, 2008
app pub date -
Sep 12, 2007
filing date -
Sep 13, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A hollow step-profiled shaft such as a cam shaft that is high in accuracy and excellent in productivity and requires little post-machining is being formed. To this end, a hollow stepped shaft 8 having its axis and large diameter portions 9a-12b intermediate axially between its ends is formed by a forming process in which each large diameter portion of the shaft is compressed with forming dies 32a-32d from at least three different directions approximately simultaneously towards the axis to shape the large diameter portion with a profile such as to conform to contours 38a-38d of a cavity 38 formed in a region of tips of the forming dies 32a-32d.
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