Method for manufacturing hollow engine valve
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United States of America Patent
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Apr 5, 2016
Grant Date -
Feb 6, 2014
app pub date -
Feb 17, 2012
filing date -
Mar 22, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
A method for manufacturing a hollow engine valve includes a step for performing rotational plastic working on a follow engine valve body semifinished product which is configured from a shaft part and a valve umbrella part forming portion connected to the shaft part. A columnar hole part is formed from the shaft part to an enlarged diameter section of the valve umbrella part forming portion to thereby reduce the diameter of the shaft part. A necking step follows the rotational plastic working step, necking the hollow engine valve body semifinished product to thereby reduce the outer diameter and the inner diameter of the shaft part. A sealing step seals the leading end of the shaft part to obtain the hollow engine valve.
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