Method of manufacturing a valve for an internal combustion engine
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United States of America Patent
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Mar 17, 2015
Grant Date -
Jan 1, 2015
app pub date -
Oct 14, 2011
filing date -
Oct 14, 2011
priority date (Note) -
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Abstract
A method of manufacturing a valve (10) is provided, in which an intermediate valve product having a generally disk-shape valve head is formed by a die unit (20). The valve head is then machined to have a proper thickness and a tapered face on the periphery of the disk-shape valve head. The valve head is repeatedly forged in secondary forging by means of a die unit (40) equipped with a die (42) and a press punch (48) while angularly displacing the tapered face relative to the die (42) through a predetermined angle. Since the die (42) has protruding pressing sections and grooves (46) along the circumference of the die, a uniformly deformed and hardened valve face (16) is formed on the valve head.
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