Method of manufacturing a Ti alloy poppet value
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United States of America Patent
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-
Mar 12, 2002
Grant Date -
N/A
app pub date -
May 16, 2000
filing date -
Feb 23, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A bar material is made of an (.alpha.+.beta.) or a near .alpha. Ti alloy which comprises a regular .alpha. structure, and the end thereof is heated at a temperature above its .beta. transformation point by an electric forging device to form an enlarged portion. The enlarged portion is immediately formed by hot forging to make a valve head of a poppet valve which is employed in an internal combustion engine. The valve head comprises an acicular .alpha. structure which provides higher fatigue and tensile strengths.
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