Press forging method
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United States of America Patent
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Nov 1, 2011
Grant Date -
Jun 19, 2008
app pub date -
Nov 28, 2007
filing date -
Dec 1, 2006
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention is a press forging method by which porosities in a raw material are removed and mechanical properties such as ductility and toughness of a steel product are at a required level in a case that a steel ingot is treated as a raw material in press forging. A cylindrical steel ingot (a so-called “round billet”) is set onto a die as a raw material, and, a forging process is applied to the steel ingot so that buckling of the steel is not generated during the forging process and that a reduction ratio and a forging ratio are more than predetermined values, respectively.
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