Method for production of valve head portion of hollow engine valve and hollow engine valve
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United States of America Patent
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Sep 3, 2013
Grant Date -
Jul 21, 2011
app pub date -
Sep 17, 2009
filing date -
Sep 18, 2008
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Forming of a valve head portion (1) of a hollow engine valve (V) comprising a material particularly satisfactory in heat resistance is performed by cold forging. On this occasion, the material with excellent heat resistance is worked to form a valve head portion semifinished product (11) having a hollow hole (S11) whose inner diameter (Φ11) is equal to the maximum inner diameter (Φ11) of a hollow hole (S1) of a finished product of the valve head portion (1), and having a diameter-increased section (111) whose maximum outer diameter (Φ12) is equal to the maximum outer diameter (Φ12) of a diameter-increased section (1a) of the finished product. Parts of the valve head portion semifinished product other than a central part to a lower part of the diameter-increased section (111) are necked down by cold forging performed a plurality of times to obtain the finished product of the valve head portion (1). This method of obtaining the finished product is provided by the present invention.
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