电火花成型加工304钢响应建模及工艺参数优化

304 EDM Response Modeling and Process Parameter Optimization

为提升电火花加工304不锈钢的表面加工质量及加工效率,提出了基于克里金模型和序列采样的电火花工艺参数优化方法。该方法以放电时间、占空比和峰值电流为优化变量,构建以材料去除率为优化目标,以表面粗糙度为约束的电火花工艺参数优化模型。引入克里金模型近似替代工艺优化变量与电火花加工性能响应间的隐式关系,并采用拉丁超立方和序列采样选取样本点,以保证近似替代模型的准确性。对优化结果的实验验证表明,该方法可有效提升电火花加工的材料去除率,满足304钢板加工表面的粗糙度要求。

To improve the surface quality and machining efficiency of 304 stainless steel plate with electrical discharge machining(EDM),a process parameter optimization method based on Kriging model and sequential sampling was proposed.The discharge time,duty cycle and peak current are selected as the optimization variables to construct the EDM process parameter optimization model with the material removal rate as the optimization target and the surface roughness as the constraint.Kriging model is introduced to replace the implicit relationship between the process optimization variables and the EDM performance responses.Using the Latin Hypercube Design(LHD)and sequential sampling method to select samples,the accuracy of Kriging model can be ensured.Through the experimental verification,the results show that the method can effectively improve the material removal rate and meet the roughness requirements of 304 steel plate surface.