Aluminum alloy automobile steering gear case and superspeed casting preparing method thereof

The invention aims at providing an aluminum alloy automobile steering gear case and a superspeed casting preparing method of the case. The case comprises, by weight percent, 10% to 12% of Si, 0.8% to 1.2% of Fe, 2% to 3.5% of Cu, 0.1% to 0.2% of Mn, 0.5% to 0.7% of Mg, larger than 0 and smaller than 1.3% of Zn, larger than 0 and smaller than 0.1% of Ni, larger than 0 and smaller than 0.06% of Pb, larger than 0 and smaller than 0.06% of Sn and the balance Al. Preparing steps comprise material preparing before casting, mold preparing, and casting press shooting. Finally, the case which is good in comprehensive performance, compact and even in structure, small in blowhole shrinkage, good in casting appearance, high in production efficiency, low in production cost and high in strength is obtained. The aluminum alloy automobile steering gear case can be widely applied to the field of automobile casting. 本发明旨在提供种铝合金汽车转向器壳体以及该壳体的超高速铸造制备方法。本发明所述壳体按重量百分比计算，包括：10～12％Si，0.8～1.2％Fe，2～3.5％Cu，0.1～0.2％Mn，0.5～0.7％Mg，0＜Zn＜1.3