Method and system for semiliquid die casting high performance mechanical components from rheocast ingots
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United States of America Patent
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Jul 9, 1996
Grant Date -
N/A
app pub date -
Sep 29, 1994
filing date -
Sep 29, 1993
priority date (Note) -
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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.
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