42CrMo钢超声滚挤压表面硬度有限元分析及参数优化

Finite element analysis and parameter optimization on surface hardness of ultrasonic rolling for 42CrMo steel

为了提高42CrMo钢零件的耐腐蚀性和抗疲劳性,基于ABAQUS建立了超声滚挤压有限元仿真模型,通过单因素试验和响应曲面法,分析了工艺参数对42CrMo钢表面硬度的作用规律和影响程度,同时对所建立的二阶响应曲面模型进行了显著性检验和工艺参数优化。结果表明,42CrMo钢的表面硬度随转速和进给速度的提高呈现先增加后下降的趋势,随着振幅和静压力的增大而增大。由响应曲面分析可知,振幅对表面硬度的影响最大,优化得到最优工艺参数组合为:转速为418 r·min^(-1)、进给速度为15 mm·min^(-1)、振幅为25μm、静压力为600 N。对优化结果进行超声滚挤压试验,将仿真优化结果和试验结果进行对比,误差在5%以内,验证了超声滚挤压仿真模拟对42CrMo钢的表面硬度进行预测的可行性。

To improve the corrosion resistance and fatigue resistance of 42CrMo steel parts,a finite element simulation model of ultrasonic rolling was established based on ABAQUS,and through single factor test and response surface method,the effect rules and influence degrees of process parameters on the surface hardness of 42CrMo steel were analyzed.At the same time,the significance test and process parameters optimization of the established second-order response surface model were carried out.The results show that the surface hardness of 42CrMo steel increases first and then decreases with the increasing of rotational speed and feeding speed,and increases with the increasing of amplitude and static pressure.From the response surface analysis,it can be seen that the amplitude has the greatest impact on the surface hardness,and the optimal process parameters combination obtained by optimization is the rotation speed of 418 r·min^(-1),the feeding speed of 15 mm·min^(-1),the amplitude of 25μm were and the static pressure of 600 N.The ultrasonic rlling test was carried out on the optimization results,and the simulation optimization results were compared with the test results,and the error is within 5%,which verifies the feasibility of the ultrasonic rolling simulation to predict the surface hardness of 42CrMo steel.