Camshaft, method of manufacturing cam for camshaft, and method of manufacturing shaft for camshaft
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United States of America Patent
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Dec 8, 2009
Grant Date -
Jun 28, 2007
app pub date -
Dec 10, 2004
filing date -
Dec 12, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
A method of manufacturing a cam for a camshaft, comprising the steps of continuously applying, to a billet having a volume larger by a specified volume than a final product, a plurality of cold forging steps formed of a preliminary outline upsetting, an outline drawing, a simultaneous piercing of inner and outer diameter surfaces, a press-molding forming excess amount as burrs on the inner diameter surface, a piercing of the inner diameter surface for removing the burrs from the inner diameter surface, and a simultaneous ironing of the inner and outer diameter surfaces. The final finishing (machining) of a cam (profile) surface can be eliminated, and the final product of the cam for the camshaft having a high dimensional accuracy can be provided.
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