Thixotropic forming process for wheels fashioned in rheocast met

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

1995-10-27

1999-05-04

Ryan, Patrick

Metal treatment

Process of modifying or maintaining internal physical...

With casting or solidifying from melt

148549, 148550, 148551, 148552, 295275, B22D 1700

Patent

active

059000805

ABSTRACT:
The starting material in a thixotropic forming process for the manufacture of road wheels, fitted ultimately with pneumatic tyres, is an ingot of rheocast metal alloy preheated to the semisolid state: the ingot is injected into a closed die affording a cavity in the shape of the wheel and equipped with independent thermoregulating circuits routed and controlled in such a way as to maintain the wider passages of the cavity at a temperature lower than that of the narrower passages; to ensure the die fills properly, the ingot is injected at a variable and controlled velocity, correlated both to the rate at which the alloy spreads through the cavity 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.

REFERENCES:
patent: 4537242 (1985-08-01), Pryor et al.
patent: 4579604 (1986-04-01), Beyer

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