| 摘要 |
PROBLEM TO BE SOLVED: To obtain aluminum alloy casting having excellent tensile strength and elongation by applying solution treatment and aging treatment after pressure-casting the aluminum alloy for pressure-casting, composed of specified ratios of Cu, Si, Mg, Fe and the balance Al with inevitable impurities. SOLUTION: The high strength aluminum alloy casting having >=35 kgf/mm2 tensile strength and >=5% elongation is obtd. by applying the heat treatment (T6 treatment) after pressure-casting the aluminum alloy for high strengthening pressure-casting, composed of 3.5-5.0% Cu, 6.5-7.5% Si, <=0.36% Mg, <=0.35% Fe and the balance Al with inevitable impurities. Pressure-casting conditions are, e.g. 700 kgf/mm2 casting pressure 0.15 m/sec injection speed, 0.78 m/sec sprue speed, 996 K casting temp., 433 K die temp. and <=1 sec shot time lag. It is desirable to apply the solution treatment by holding at 510-525 deg.C for 6 hr and successively, apply the aging treatment at 160-170 deg.C for 6-7 hrs.
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