钛合金筒形件温热强旋热力耦合有限元模拟

FEM coupled thermal simulation of warm power spinning of cylindrical workpiece of titanium alloy

针对BT20钛合金筒形件建立了三维热力耦合有限元模型,在有限元模拟过程中叠加了火焰加热边界条件.计算了成形过程中工件上温度场的分布情况以及旋压力的变化.所建立的有限元模型更加符合实际工况,模拟结果更加真实可靠.

Change of temperature distribution during warm shear spinning of a cone workpiece of titanium alloy greatly affects its success and the product＇s precision. Therefore it is very important to find a simulation model with actual temperature boundary conditions of a heating source in a numerical simulation. Focusing on a cylindrical workpiece of BT20 titanium alloy, a 3 D rigid plastic FEM simulation coupled thermal model on warm shear spinning is founded and the temperature boundary condition of heating by flame is applied. The variation of temperature distribution on the workpiece caused by heat exchange between them and heat source and variation of spinning forces are presented. The model is corresponds well to the actual process, and the calculated results are more accurate.