Metal working – Means to assemble or disassemble – Puller or pusher means – contained force multiplying operator
Patent
1980-07-14
1982-12-21
Crane, Daniel C.
Metal working
Means to assemble or disassemble
Puller or pusher means, contained force multiplying operator
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.
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Crane Daniel C.
TRW Inc.
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