METHOD OF PRODUCING A HOLLOW POPPET VALVE AND AN APPARATUS THEREFOR
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United States of America Patent
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Issued Date -
Feb 28, 2013
app pub date -
Dec 2, 2011
filing date -
Aug 24, 2011
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A method of producing a hollow valve comprises the step for forming material having a blind hole along its axis, the step for extruding the material in a shaping hole in a die downward and the step for lowering a lower part of a pin to an upper part of a smaller-diameter portion of the shaping hole to allow the material to plastically flow downward through a gap between the lower part of a pin and the smaller-diameter portion of the shaping hole thereby molding a primary intermediate of the hollow valve having a stem and a head at the upper end of the stem through which a hole is formed.
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