Method for producing a hollow engine valve
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United States of America Patent
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Aug 30, 2016
Grant Date -
Dec 18, 2014
app pub date -
Jan 21, 2013
filing date -
Jan 30, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
The present invention provides a method for producing a hollow engine valve, with which the production process can be simplified and the processing precision can be improved. To this end, the present invention provides a method for producing a hollow engine valve (1) which is provided with a valve main body (10) in which a hollow hole (10c) is formed along a valve umbrella part (10a) and a hollow shaft part (10b), wherein a solid round bar (11) forming the material of the valve main body (10) is molded to a semi-finished article (12) by means of a single hot-forging process, the semi-finished article (12) is subjected to rotary swaging whereby the semi-finished article (12) is molded into a semi-finished article (13), the semi-finished article (13) is subjected to necking whereby the semi-finished article (13) is molded into the valve main body (10), and a shaft end sealing member (20) is joined to the end part of the hollow shaft part (10b) of the valve main body (10).
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