钛合金精密铸造型壳力学参数与应力模拟

Shell Mechanical Parameters and Stress Simulation of Titanium Alloy Investment Casting

为提升钛合金在型壳内冷却成形模拟的准确率,对铝矾土-硅溶胶型壳的抗弯弹性模量和平均线膨胀系数进行了测量,并基于ProCAST对钛合金骨架进行了应力模拟。受试样内部孔隙率的影响,弹性模量的测量结果差异较大,而热膨胀系数受此影响较小。模拟预测了铸造残余应力,并显示在铸件外围发生了铸造变形。测量结果验证了模拟的准确性。

To improve the accuracy of the cooling forming simulation of titanium alloy in the shell,the flexural elastic modulus and average linear expansion coefficient of the bauxite-silica sol shell were measured,and the stress simulation of the titanium alloy skeleton was performed based on ProCAST.Affected by the internal porosity of the sample,the measurement results of the elastic modulus are quite different,and the thermal expansion coefficient is less affected by this.The simulation predicted the casting residual stress and showed that casting deformation occurred at the periphery of the casting.The experimental measurement results verify the accuracy of the simulation.