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在特定气压力场下实现铝液充型和凝固的反压铸造技术 ,能有效地提高H+ 在铝液中的溶解度 ,抑制铸件凝固过程中因H+ 析出而形成针孔的缺陷。同时 ,压力场又明显提高了铸件与型腔的密着效果 ,致使铸件获得比其它方法更佳的冷却效果 ,从而使铸件具有更细的结晶组织 ,大大提高了材料的致密性和力学性能。在汽车整体铝合金车轮中 ,具有特殊要求的大偏距载重型车轮的研制结果证明 ,用该法不仅能满足中型载重车轮的力学性能 ,且能有效适应良好铸造表面的抛光轮、电镀轮等产品的需要
The counter-pressure casting technology of filling and solidifying molten aluminum under specific gas pressure can effectively improve the solubility of H + in molten aluminum and inhibit the formation of pinholes due to H + precipitation in the solidification of castings. At the same time, the pressure field obviously improves the adhesion between the casting and the cavity, resulting in a better cooling effect of the casting than other methods, so that the casting has a finer crystal structure and greatly improves the material’s compactness and mechanical properties. In the car overall aluminum alloy wheels, with the special requirements of the large-offset load-bearing wheels developed results show that the method can not only meet the mechanical properties of medium-duty truck wheel, and can effectively adapt to a good casting surface polishing wheel, electroplating wheel Product needs