Method of making exhaust valves for use in automobiles

Details Method of making exhaust valves for use in automobiles Method of making exhaust valves for use in automobiles

1996-07-15

1998-07-14

Solis, Erick R.

Metal working

Method of mechanical manufacture

Prime mover or fluid pump making

1231883, B21K 122

Patent

active

057785341

ABSTRACT:
A method of making an exhaust valve for use in an automobile is disclosed. The exhaust valve is manufactured by forging Ti-6Al-2Sn-4Zr-2Mo-0.1Si alloy at a temperature of 1000.degree.-1200.degree. C., and annealing the forged alloy by cooling after maintaining it at a temperature of 1020.degree.-1060.degree. C. for 0.5-1.5 hours. The method further includes the step of stress relieving the forged alloy, the stress relieving step including a cooling step after maintaining the forged alloy at a temperature of 600-700.degree. C. for 1.5-2.5 hours. A strain rate of the forging step is 0.5-5/S, and the cooling of the annealing step includes a control cooling step at 0.6.degree.-0.7.degree. C./sec or the cooling of the stress relieving step includes an air cooling step. The exhaust valve has improved hardness.

REFERENCES:
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patent: 3286704 (1966-11-01), Danis
patent: 4729546 (1988-03-01), Allison
patent: 5112415 (1992-05-01), Mae
patent: 5169460 (1992-12-01), Mae
patent: 5257453 (1993-11-01), Neumann et al.
patent: 5662745 (1997-09-01), Takayama et al.

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