Gas-assisted molding of thixotropic semi-solid metal alloy
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United States of America Patent
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Aug 4, 1998
Grant Date -
N/A
app pub date -
Dec 2, 1996
filing date -
Dec 2, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
High strength to weight ratio, improved dimensional and surface quality hollow metal moldings are formed by injecting thixotropic, semi-solid metal billets as a 'short shot' into a mold cavity; introducing an inert gas into the charge under pressure to force the metal into full and faithful contact with cavity surfaces and to form a hollow portion in the molding; maintaining the pressure of the gas on the charge in the cavity until the metal has solidified and then venting the gas for molded product removal.
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