为探讨超声水雾中第二次切割的加工参数对模具钢Cr12MoV表面粗糙度和切割速度的影响规律,在往复走丝线切割加工中,计划采用一种多介质的多次切割新工艺,即第一次切割在乳化液中进行,第二次切割在超声水雾中,第三次切割在大气中。实验采用单因素法,分析了脉冲宽度、峰值电流、工件厚度、偏移量、水雾量和工作台进给速度对表面粗糙度和切割速度的影响规律;借助中心复合法的建模优势及Design-Expert软件绘制三维响应曲面图的功能,建立了精度较高的线切割精加工表面粗糙度和切割速度的回归模型公式,经过实验验证表面粗糙度的实测值和预测值的相对误差最高为3.56%,切割速度的实测值和预测值的相对误差最高为-8.68%;由回归方程方差分析结果可知,工作台进给速度和脉冲宽度对表面粗糙度的影响非常显著,工作台进给速度对切割速度的影响非常显著。 In order to investigate the influence of processing parameters of the second cutting in ultrasonic water mist on the surface roughness and cutting speed of Cr12MoV die steel, a multi-media multi-cutting new process is planned to be used in reciprocating wire cutting. One cut is done in the emulsion, the second cut in the ultrasonic mist, and the third cut in the atmosphere. The influence of pulse width, peak current, workpiece thickness, offset, water mist and table feed speed on surface roughness and cutting speed was analyzed by single factor method. Design-Expert software to draw the function of three-dimensional response surface map, the establishment of a high precision wire cutting finishing surface roughness and cutting speed regression model formula, the experimental results show that the measured surface roughness and the predicted value of the relative error of the highest 3.56%. The relative error between the measured value and the predicted value of the cutting speed is up to -8.68%. From the analysis of variance of the regression equation, it can be seen that the influence of feed speed and pulse width on the surface roughness is very significant. The impact on cutting speed is significant.