30CrMnSiNi2A钢轴类零件感应热处理的数值模拟

利用Comsol软件对30CrMnSiNi2A钢的感应回火进行了模拟，利用控制变量法研究了感应加热过程中电源频率、电流以及线圈的结构和尺寸参数对工件内部温度均匀性的影响。结果表明，电流强度和电源频率越大，工件在感应加热过程中的升温速率越大，最终平衡温度越高，但其径向/轴向温差越大。线圈的匝数越多，工件的升温速率和径向/轴向温差越大，最终平衡温度越高。线圈半径的变化仅会对工件端部的升温速率产生影响，线圈半径越小，工件端部的升温速率越快，轴向温差越小。线圈截面外径和壁厚的变化对工件感应加热过程中的温度场没有影响。根据模拟结果的对比分析，提出了一种采用分段加热法与增设导磁体相结合的方法，对感应回火系统进行了优化。通过优化设计可使工件在感应加热过程中的径向温差基本消除，使轴向温差小于10℃。

Numerical simulation of induction heat treatment of 30CrMnSiNi2A steel shaft parts

Comsol software was used to simulate the induction tempering of 30CrMnSiNi2A steel. The effects of power frequency, current, and structure and size parameter of coil on temperature homogenity in the workpiece during induction heating were studied by using control variable method. The results show that the greater the current intensity and power frequency, the greater the heating rate of the workpiece in the induction heating process, the higher the final balance temperature, but the greater the radial/axial temperature difference. The more turns of the coil, the greater heating rate and radial/axial temperature difference of the workpiece, as well as the higher the final balance temperature. The change of coil radius will only affect the heating rate at the end of the workpiece, the smaller the coil radius, the faster the heating rate at the end of the workpiece, and the smaller the axial temperature difference. The change of coil section outer diameter and wall thickness has no effect on the temperature field of the workpiece during induction heating. According to the comparative analysis of the simulation results, a method of combining sectional heating method with adding magnetic flux concentrator is proposed to optimize the induction tempering system. Through design optimization, it is possible to eliminate the radial temperature difference of the workpiece during induction heating, while also controlls the axial temperature difference to be within 10 ℃.