Thixotropic forming process for wheels fashioned in rheocast...

Details Thixotropic forming process for wheels fashioned in rheocast... Thixotropic forming process for wheels fashioned in rheocast...

B - Operations, Transporting

22

D

B22D 17/32 (2006.01) B21K 1/38 (2006.01) B22D 15/00 (2006.01) B22D 17/00 (2006.01) B60B 1/08 (2006.01)

Patent

CA 2161923

The starting material in a thixotropic forming process for the manufacture of road wheels, fitted ultimately with pneumatic tyres, is an ingot (1) of rheocast metal alloy preheated to the semisolid state: the ingot is injected into a closed die (5) affording a cavity (7) in the shape of the wheel and equipped with independent thermoregulating circuits (6), routed and controlled in such a way as to maintain the wider passages (A) of the cavity at a temperature lower than that of the narrower passages (B); to ensure the die fills properly, the ingot (1) is injected at a variable and controlled velocity, correlated both to the rate at which the alloy spreads through the cavity (7) and to the geometry of the cavity itself, whereupon a pressure much higher than the injection force is applied to the solid-semisolid interface within the alloy, and sustained until full solidification is achieved.

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