Process for making exhaust valves

Metal working – Method of mechanical manufacture – Prime mover or fluid pump making

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Details

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.

REFERENCES:
patent: 1100779 (1914-06-01), Rich
patent: 1351949 (1920-09-01), Fuchs
patent: 2170267 (1939-08-01), Rich
patent: 3319321 (1967-05-01), Danis
patent: 3366472 (1968-01-01), Tanczyn et al.
patent: 3401036 (1968-09-01), Dulis et al.
patent: 3753693 (1973-08-01), Espy
patent: 3770426 (1973-11-01), Kloske et al.
patent: 4902359 (1990-02-01), Takeuchi et al.
patent: 4929419 (1990-05-01), Wegman et al.
patent: 4985092 (1991-01-01), Kaede et al.

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