Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1994-09-29
1996-07-09
Lin, Kuang Y.
Metal founding
Process
Shaping liquid metal against a forming surface
164113, 1641546, 164312, 164900, B22D 2708, B22D 1708
Patent
active
055335624
ABSTRACT:
A method including a preheating stage wherein rheocast light alloy ingots are preheated to a temperature within the solidification range of the alloy; and a die casting stage wherein a mold is filled with the semiliquid alloy. The preheating stage is performed in a forced-convection-heated tunnel furnace, with the ingots housed inside cup-shaped containers which, following a temperature check, are tipped by a robot to unload the ingots into the injection chamber of a die casting machine. Work is conducted within a temperature range depending on the composition of the alloy, and such that, at the minimum permissible injection temperature, the ingot is incapable of maintaining its own shape, and, at the maximum permissible injection temperature, the apparent viscosity of the ingot is such as to ensure the mold is filled under laminar flow conditions.
REFERENCES:
patent: 4310352 (1982-01-01), Manfre
patent: 4537242 (1985-08-01), Pryor et al.
Metallurgical Transactions, vol. 22B, No. 1, Feb. 1991, M. C. Flemmings, "Behavior of Metal Alloys in the Semisolid State", pp. 287-291.
Moschini Renzo
Poggi Stefano
Lin Kuang Y.
Weber s.r.l.
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