Method of forming cam lobe
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United States of America Patent
Stats
-
Jun 19, 2012
Grant Date -
Apr 30, 2009
app pub date -
Oct 29, 2008
filing date -
Oct 29, 2007
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A primary intermediate formed article is formed into a substantially columnar shape. A secondary intermediate formed article is obtained by piercing a preliminary hole in the primary intermediate formed article such that a radial thickness of a prospective cam top part is larger than a radial thickness of a prospective cam base part, and by forming a positioning part. The positioning part is brought into contact with a tertiary intermediate forged article forging die so as to be positioned, and the secondary intermediate formed article is pressed and forged to form a tertiary intermediate forged article including a cam top, a cam base, and a deformed hole formed by deforming the preliminary hole. A finished cam lobe is obtained by piercing, in an area including the deformed hole.
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