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对镁合金摩托车轮毂的真空压铸工艺进行了研究。结果表明,高压铸造采用真空辅助,可以减少甚至消除合金熔体高速喷射充型时模具型腔内气体来不及排出形成的氧化夹杂、气孔等普通压铸的缺陷,提高了铸件的工艺品质,并可通过热处理提升铸件本体的力学性能。镁合金轮毂采用底部浇注中心抽真空的充型方式,可以避开中心浇注顶部抽真空效率低下的缺点;相比中心浇注顶部抽真空中心单向补压的方式,轮缘和轮心双向补压可获得更佳的力学性能,避免了中心浇注顶部抽真空中轮辐和轮心的加厚,减少了材料的浪费。
The vacuum die-casting process of magnesium alloy motorcycle hub was studied. The results show that vacuum assisted casting can reduce or even eliminate defects such as oxidation inclusions, pores and other common die-castings caused by the gas in the mold cavity being discharged during the high-speed jet filling of the alloy melt, improve the process quality of the castings, Heat treatment enhances the mechanical properties of castings. Magnesium alloy wheel bottom pouring center vacuum filling filling method can avoid the center of the top of the vacuum pumping efficiency of the shortcomings; compared to the center of the top of the vacuum pumping center of the way one-way pressure, wheel rim and wheel center two-way pressure Can get better mechanical properties, to avoid the center of the top of the vacuum pumping the spokes and wheel center thickening, reducing material waste.