Method and apparatus for simplified production of heat-treatable aluminum alloy castings
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United States of America Patent
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Jul 13, 1999
Issued Date -
N/A
app pub date -
Jan 30, 1997
filing date -
May 19, 1995
priority date (Note) -
Expired
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Abstract
Method and apparatus for simplified heat-treatment to harden aluminum castings made from heat-treatable aluminum alloys, especially with a copper content of up to 5%, such as the 300-T6 series, for example those cast aluminum parts utilized in the manufacture of automobile motors: cylinder heads, engine blocks and the like; whereby the castings are directly quenched before cooling below 400.degree. C. (and preferably immediately after demolding) without undergoing the conventional steps of natural cooling followed by a re-heating 'solution' heat treatment (typically of at least 470.degree. C. for at least two hours, or for a shorter time at higher temperatures) which 'solution' heat treatment requires excessive and expensive equipment, energy, and production time. This invention also has the unexpected beneficial effect of avoiding development of silicon spheroidization in the alloy matrix thereby resulting in improved machining properties.
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