Method for producing engine valve in which sodium metal is sealed
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United States of America Patent
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Oct 22, 2013
Grant Date -
Jan 24, 2013
app pub date -
May 2, 2011
filing date -
May 12, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
Provided is a method for producing an engine valve by subjecting a stem portion having a hollow part to a drawing treatment using a series of dies such that the outer diameter and inner diameter of the stem portion become smaller in steps and the stem portion is thereby molded to the desired size, whereby, after the stem portion has been subjected to the drawing treatment until the inner diameter of the hollow part of the stem portion has reached a specific size, sodium metal in the form of a solid block is introduced to the hollow part of the stem portion, and a protective agent made from solid paraffin or naphthalene is also introduced to the hollow part of the stem portion such as to form a barrier between the sodium metal and the atmosphere, after which the stem portion is further subjected to a cold drawing treatment.
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