18CrNiMo7-6钢超声滚压工艺参数多目标优化及试验研究

Multi-objective optimization and experimental study on ultrasonic rolling process parameters of 18CrNiMo7-6 steel

为了改善18CrNiMo7-6钢的表面质量,使用自主设计的超声滚压装置对试样进行超声滚压加工。通过单因素试验和响应面法,研究了工艺参数及其交互作用对18CrNiMo7-6钢表面粗糙度、残余应力和磨损率的影响,并对所建立的二阶响应面回归模型进行显著性检验。采用满意度函数法对工艺参数进行多目标优化,得到最佳参数为:静压力269 N、滚压次数4、超声振幅7μm。使用最佳工艺参数进行试验验证,试样的表层塑性变形,晶粒细化程度和耐磨性能得到提高,试验结果的预测误差低于5%,验证了优化结果的可行性。

To improve the surface quality of 18CrNiMo7-6 steel,samples were processed by ultrasonic rolling with a self-designed ultrasonic rolling device.The effects of process parameters and their interaction on surface roughness,residual stress,and wear rate of 18CrNiMo7-6 steel were studied by single-factor tests and response surface methodology,and the significance of the established second-order response surface regression model was tested.The desirability function method is used to optimize the process parameters,and the optimum process parameters are that the static pressure is 269 N,the number of passes is 4,and the ultrasonic amplitude is 7μm.The experimental results show that the surface plastic deformation,grain refinement,and wear resistance of the sample were improved,and the errors between experimental values and predicted values were less than 5%,which verified the feasibility of the optimization results.