machining 356 aluminum casting

Many aluminums (and other materials) require stress annealing after
bulk machining and prior to a finish machining. I have not been able
to find anything one way or the other regarding this material. Does
anyone have an answer? If the answer is yes, what are the annealing
requirements.
Reply to
harrisd
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I found the following information in a couple of old books:
ALCAN, "Heat Treating Aluminium" : "Castings that are used in applications involving elevated temperature or where extremely close machining tolerances are necesarry may require a stress-relieving and degrowthing treatment which involves heating the casting at a temperature of 280°C (536°F) for 10 hours"
Reynolds Metals Company, "CASTING Aluminium, Table 19": "Stress relieving of Die Castings to reduce internal stress 350-500°F for 4-6 hours and cool in still air"
Neither of the books give anything on heat treating of specific alloys.
Regards Kai Wøldike Sørensen
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Kai Wøldike Sørensen

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