基于线性逼近的感应加热弯曲成形工艺及其应用

Investigation on Processing and Application of Plate Bending with Induction Heating Based on Linear Approximation

采用高频感应加热装置进行热弯成形试验,得到典型的单曲率板。通过高效的热-弹-塑性有限元计算,再现板材热弯成形的温度场特征和力学响应。同时,研究感应加热过程中的工艺参数对板材弯曲变形的影响,提出线性逼近迭代二分法和迭代0.618法,确定板材实际加热中的加热线位置和感应加热速度,并对其进行有限元分析。研究结果表明:采用规划的工艺参数进行热-弹-塑性有限元分析,得到的面外弯曲变形和面内收缩均与目标曲率板相吻合;线性逼近迭代二分法和迭代0.618法应用在感应加热单曲率热弯成形中具有良好的可行性和准确性,可供曲板热弯工艺的规划参考。

The thermal bending test was carried out with high frequency induction heating device,and the typical single curvature plate was obtained.Then,the thermal-elastic-plastic finite element computation is used to represent the temperature profile and mechanical response of plate thermal bending.At the same time,the influence of processing parameters to the bending deformation of plate with induction heating is examined,and the linear approximation with iterative bisection and iterative 0.618 methods are proposed to determine the position of line heating and the moving speed of heat source for actual heating of plate,which is also verified by finite element analysis.The results show that the out-of-plane bending deformation and in-plane transverse shrinkage obtained by finite element analysis with the processing parameters obtained by proposed methods are consistent with the target curvature plate.The research results confirmed the feasibility and accuracy of proposed linear approximation with iterative bisection and iterative 0.618 methods for thermal bending processing of single curved plate,and provided new ideas for the planning of thermal bending processing in actual production.