基于正交试验的弯管热推制成形数值模拟

Finite Element Simulation of Hot-pushing Pipe-bending Process Based on Orthogonal Test

采用有限元软件MSC.Marc对弯管成形过程进行了数值模拟,利用正交试验法对成形过程的关键参数(芯模的弯曲角度、加热温度、起始弯曲半径、推制速度、工模间摩擦系数)进行了优化以弯管凹边壁厚变化率最小及均匀性良好为目标,得到了等壁厚弯管成形的最优参数值,即加热温度750℃,推制速度4 mm/s,摩擦系数0.18,芯棒的弯曲角度45°,初始弯曲半径1.4。

The hot pushing pipe bending process is simulated by using finite element software MSC. Marc. The key parameters of forming process, i. e., bending angle of the core mandrel, heating temperature, initial bending radius,pushing speed and the friction coefficient, are optimized by the orthogonal test. Taking the minimum change rate and good uniformity of the concave side wall thickness of the pipe as targets, the optimized technological parameters are obtained as follows： heating temperature 750℃, pushing speed 4 mm/s, bending angle of the core mandrel 45° and initial bending radius 1.4.