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在采用熔模精密铸造生产拨叉的过程中,热裂是常见的铸造缺陷。为了充分分析热裂产生的原因,采用铸造仿真软件Procast对铸造过程进行模拟,对流场、温度场、应力场进行了模拟和分析,预测和分析热裂产生的位置,结果表明:拨叉铸造过程中,局部区域应力集中,在缩孔附近产生热裂纹。通过降低浇注温度,提高模壳预热温度,增大凸台过渡倒角,可以减小应力集中,从而避免热裂。
Hot fissures are common casting defects in the production of forks using investment casting. In order to fully analyze the causes of hot cracking, the casting simulation software Procast was used to simulate the casting process. The flow field, temperature field and stress field were simulated and analyzed. The location of thermal cracking was predicted and analyzed. The results showed that the fork casting During the process, the stress in the local area is concentrated and hot cracks occur near the shrinkage cavity. By reducing the pouring temperature, raising the preheating temperature of the mold shell and increasing the transition chamfer of the boss, the stress concentration can be reduced, thereby avoiding the thermal cracking.