Metal working – Method of mechanical manufacture – Prime mover or fluid pump making
Patent
1992-07-08
1993-11-02
Eley, Timothy V.
Metal working
Method of mechanical manufacture
Prime mover or fluid pump making
29888451, 29888452, B21D 5300
Patent
active
052574539
ABSTRACT:
A method of making work-hardened poppet exhaust valves for internal combustion engines comprises the steps of: providing a solutioned work-hardenable austenitic stainless steel coil or bar stock in which chromium is present in the range of 13%-25% by weight, nickel is present in the range of 4%-16% by weight, manganese is present in the range of 0.25%-8% by weight, copper is present in the range of 0.5%-7% by weight, the interstitial elements carbon plus nitrogen are present in a total amount less than 0.45% by weight, and at least one refractory metal selected from the group consisting of molybdenum, niobium, vanadium, tungsten and tantalum is present in the range of 1%-5% by weight; extruding the coil stock to a poppet valve preform configuration at a speed in the range of 60 to 100 strokes per minute and at a temperature in the range of room temperature to 1,000.degree. F.; and heading the preform at the same speed while maintaining the head of the preform at a temperature in the range of room temperature to 2,200.degree.; the parameters of extrusion providing the work-hardened poppet valve with a stem hardness more than R.sub.c =25.
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Kurup Mohan
Levin Victor
Neumann William
Wills Roger R.
Eley Timothy V.
TRW Inc.
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