基于RSM的丝杠感应淬火工艺数值模拟及参数优化

Numerical simulation of process and parameter optimization in the induction hardening of screw based on the RSM

滚珠丝杠在感应加热过程中的温度分布对淬火后的组织性能具有至关重要的影响,利用MSC.Marc软件建立55Cr Mo钢感应加热过程的有限元模型并研究了感应线圈移动速度、电流频率、电流密度等因素对加热后温度场及相变的影响,采用RSM对试验结果进行回归分析,得到齿顶和沟底完全奥氏体化深度、丝杠表面最高温度的拟合方程及曲面模型,从而优化出最佳感应淬火工艺参数。优化结果表明,当线圈移动速度为240 mm/min,频率约7000 Hz,密度约1.91 e^7A/m^2时,齿顶完全奥氏体化深度约5.10 mm,沟底完全奥氏体化深度约2.20 mm,表面最高温度约930℃,淬火后能得到相应深度的硬化层。

The temperature distribution during induction heating of the ball screw is important for it's microstructure and property after quenching. The article using MSC. Marc software established the finite element model of induction heating of 55 Cr Mo steel and discussed the influences of process parameters on the temperature,such as the speed of induction coil,the current density and the current frequency. Finally,the response surface models of the austenization depth and the highest surface temperatures were obtained by using the method of regressing analysis,and the optimum parameters were gained. The optimization results showed the predicted value of the austenization depth of crest and root,the highest surface temperature were 5. 10 mm,2. 20 mm and 930 ℃ respectively when the speed of coil was 238-245 mm/min,the frequency was 7000 Hz and the density was 1. 91e^7 A/m^2,after quenching,the corresponding hardening layer can be obtained.