电火花线切割加工工件厚度在线识别技术研究

摘要

通过理论分析方法推导得到工件厚度与放电间隙两端间的平均电压、平均电流、机床伺服进给速度、线切割缝宽等参数的关系式。采用田口试验方法分析不同加工参数下电火花线切割加工不同厚度工件时放电两极之间平均电压、平均电流、线切割缝宽及加工速度的影响规律，研究一种基于灰色理论的线切割缝宽预测模型，并基于该模型研究一种基于广义回归模型在线识别电火花线切割加工工件厚度的方法。工件厚度在线识别技术可实现电火花线切割加工时对工件厚度的预测，是电火花线切割自适应加工变厚度工件的前提和关键。%This paper derived the relationship expression between workpiece height and average voltage, average current,servo feed rate of wire electrode,the process width with theoretical analysis method. A taguchi experiment was adopted to found the effect laws of different processing parameters and different heights workpiece. A predicting model on the process width was built based on grey theory. By this predicting model,a mathematical model based on multi-nonlinear regression method was built. The online identification technology of workpiece height could predict workpiece height online in different process parameters,which was the key point of adoptive process control for variable workpiece height in wire electrical-discharge machining (WEDM).