METHOD FOR MANUFACTURING HOLLOW ENGINE VALVE
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United States of America Patent
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Issued Date -
Dec 6, 2012
app pub date -
Oct 6, 2010
filing date -
Feb 26, 2010
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A method for manufacturing a hollow engine valve includes inserting a half-finished hollow shaft section in sequence into die holes which have different hole shapes, and sequentially drawing so as to reduce the outer diameter and the inner diameter of the hollow shaft section and stretch its length in stages. The half-finished product is subjected to heat treatment so that the hardness thereof is lower than or equal to a predetermined level. A shaft end sealing section is formed by increasing the wall thickness of the opening end of the hollow shaft section toward the inside of the opening and the gap in the shaft end sealing section is welded.
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