【摘要】 对镁合金轮毂低压铸造模具关键部位的冷却性能进行模拟研究,对比了采用不同冷却方式所产生的凝固缩孔缺陷.研究发现,单独设置侧模冷却管道是一种有效的冷却方式,能够很好地减小镁合金轮毂低压铸造凝固过程中在轮辐与轮辋连接处所产生的合金液体孤岛体积,使其位置向轮心方向移动,进而降低这些区域的缩孔缺陷.通过对改进冷却性能后的轮毂实施静力学强度分析,对比改善前后轮毂应力应变分布情况,表明了模具冷却性能改善的有效性.更多还原

【Abstract】 The cooling performance at the key regions of mold during the low pressure die casting(LPDC) of magnesium wheel was investigated. Through analyzing the shrinkage defects generated under the conditions of various cooling modes, it was found the cooling pipe system set in the side mold alone is a valid way to enhance the cooling capacity at the rim/spoke junction areas. The mode can lower the generation of hot spots at the junctions, so the shrinkage defects at these regions are limited obviously. Furthermore, the statics analysis was carried out to compare the distribution of stress and strain between the former and current product. The result shows the cooling mode selected is effective.更多还原