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针对228型汽车转向泵Al-10Si铸件金属型铸造存在的渣孔、缩松及针孔等缺陷,研究了合金熔体处理工艺对转向泵铸件金属型铸造缺陷和力学性能的影响。试验表明,Al-Ti-C+Al-Sr复合变质比Al-Ti-B+Al-Sr复合变质有更好的晶粒细化效果,使铸件的抗拉强度提高了10%,伸长率提高了40%～50%;在Al-10Si合金熔体的精炼净化处理方面,旋转精炼气泡浮游法比熔剂法有更强的除渣、除气能力。旋转气泡浮游法在转速为400r/min、气体流量为5L/min、旋转精炼15min、静置9min后,夹渣废品率从原来的36.2%降至1.2%以下,铸件合格率提高至97%。
In view of the defects such as slag hole, shrinkage and pinhole existing in Al-10Si castings of 228 type automobile steering pump, the effects of alloy melt treatment on the defects and mechanical properties of metal castings of steering pump were studied. The results show that the Al-Ti-C + Al-Sr composite metamorphism has a better grain refinement effect than Al-Ti-B + Al-Sr composite metamorphism, which increases the tensile strength of the castings by 10% Increased by 40% ~ 50%. In refining refining process of Al-10Si alloy melt, rotary refining bubble floatation method has stronger slag removal and degassing ability than flux method. Rotary bubble floatation method in the speed of 400r / min, the gas flow rate of 5L / min, rotary refining 15min, stand for 9min, slag rejection rate from the original 36.2% down to 1.2%, the casting pass rate increased to 97%.