Iron aluminum based engine intake valves and method of making th

Details Iron aluminum based engine intake valves and method of making th Iron aluminum based engine intake valves and method of making th

1992-12-15

1994-07-12

Yee, Deborah

Metal treatment

Stock

Carburized or nitrided

148902, 29888452, 420 77, 420 81, C22C 3806, C21D 106

Patent

active

053285271

ABSTRACT:
The present invention resides in a method for making an internal combustion engine intake valve. An iron aluminum alloy, in the form of a coil or bar stock, is provided. The alloy comprises 76.05 to 90.15 weight percent iron, 9 to 13.3 weight percent aluminum, 0.05 to 0.35 weight percent carbon, and 0.5 to 3 weight percent of a refractory metal, and/or 0.3 to 1.5 weight percent of titanium in combination with, or in place of, the refractory metal. The coil or bar stock is extruded to a poppet valve preform configuration at a heading temperature in the range of 800.degree. to 2,000.degree. F. and a true strain of about 0.5 to 2.2. The preform configuration is then headed to a pre-machined configuration while maintaining the head of such preform at an effective heading temperature up to 2,200.degree. F., said heading being carried out at a true strain of about 1.4 to 2.3. The headed preform is then machined, to its machined configuration, without intermediate heat treatment, and then is coated by either nitriding or chrome plating. If desired, a hardenable steel tip can be welded to the valve stem, and then heat hardened.

REFERENCES:
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patent: 3582323 (1971-06-01), Sawyer et al.
patent: 4926534 (1990-05-01), Windelbandt
patent: 4961903 (1990-10-01), McKamey et al.
patent: 5056219 (1991-10-01), Iwase
patent: 5084109 (1992-01-01), Sikka

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