Method for manufacturing a forged piston with reinforced ring gr

Metal working – Means to assemble or disassemble – Puller or pusher means – contained force multiplying operator

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Details

29447, 92213, 92222, 123193P, 2771895, 148 123, 148 127A, B23P 1510

Patent

active

043641598

ABSTRACT:
The method effects a tight fit of a ferrous ring reinforcement at the head end of an aluminum alloy piston which tight fit remains during use of the piston. The procedural steps of the preferred method include: providing an aluminum alloy piston slug with an annular shoulder adjacent its head end; solution heat treating the aluminum alloy slug for one hour minimum at a temperature within the range of from 483.degree. C. to 510.degree. C. (900.degree. F. to 950.degree. F.); rapidly cooling the solution heat-treated aluminum alloy slug to create a super-saturated aluminum alloy solid solution; preheating the ferrous ring to approximately 538.degree. C. (1000.degree. F.), a temperature above the head end temperature during use of the piston, to expand the ring temporarily; preheating the aluminum alloy slug to a working temperature of approximately 204.degree. C. (400.degree. F.), a temperature below the head end temperature during use of the piston; telescopically assembling the preheated and temporarily expanded ring on the head end against the shoulder and forging to cause the super-saturated aluminum alloy to flow axially and transversely against the temporarily expanded ring; and age hardening the super-saturated aluminum alloy at a temperature within the range of from 210.degree. C. to 221.degree. C. (410.degree. F. to 430.degree. F.) for about nine hours to cause a constituent precipitation which, together with contraction of said ferrous ring upon cooling, effects a tight fit which remains during use of the piston.

REFERENCES:
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patent: 2124360 (1938-07-01), Welty
patent: 2262074 (1941-11-01), Welty
patent: 2396730 (1946-03-01), Whitfield et al.
patent: 3413897 (1968-12-01), Atkin
patent: 3430969 (1969-03-01), Clary
patent: 3515741 (1970-07-01), Elliott
patent: 3596571 (1971-08-01), Hill et al.
patent: 3761252 (1973-09-01), O'Rourke et al.
patent: 4268322 (1981-05-01), Willis

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