Poppet valve with a formed seat, and method of making
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United States of America Patent
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Oct 20, 2015
Grant Date -
Jul 10, 2014
app pub date -
Mar 13, 2014
filing date -
Jun 14, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
A method of forming a poppet valve having a stem, a valve head and a valve seat while concurrently maintaining compressive residual stress without grain coarsening on both the valve body and the valve seat. The method includes forming a rounded cladded part on the valve head of the poppet valve by welding and forming a valve seat surface at a predetermined aperture angle and cutting the cladded part to form a smooth surface which is subjected to uniform contact pressure at a temperature less than the recrystallization temperature of the base material or cladding material, whichever is lower, to enhance the durability of the valve seat.
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