拨叉热裂数值模拟与分析

Numerical Simulation and Analysis of Hot Cracking in the casting of Fork

摘要:

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,本文采用铸造仿真软件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。

Abstract:

In the investment casting of shifting fork,hot crack is the common defact.in order to analysis the hot cracking in the investment casting,The ProCAST software is adopted, the fork investment casting process is simulated,The filling field,temperature field and stress field is analysised, the cause of crack is predicted. The result shows that: as the local area is received larger tensile stress from around, the shrinkage cavity appears, leading to crack.By reducing the pouring temperature,increasing preheating temperature of the shell, increasing chamfer angle of the fork, the casting stress can be reduced, the crack can be avoided.