调节横向走刀速度的电火花铣削加工策略

Strategy of EDM milling based on infeed speed adjustment

在定长补偿法和电极轴向补偿的基础上,提出了一种基于横向走刀速度调节的电火花铣削加工策略。在使用内冲液管状电极和电极损耗自动补偿的条件下,针对给定的电参数、工具电极以及工件,通过调节工件横向走刀速度进行电火花铣削加工。建立了数学模型,依据材料蚀除速率、电极损耗比、电极补偿精度、轴向吃刀深度、放电间隙等参数计算出最理想的工件横向走刀速度,所建立数学模型计入了圆柱电极因底面尖端放电而产生残切角的影响。最后通过实验验证该策略和数学模型的可行性。

On the basis of fixed length compensation method and the electrode axial compensation, this paper pro- poses processing strategy of EDM milling which is based on the adjustment of infeed speed. In the condi- tion of using the inner filling tubular electrode and automatic compensation of electrode wear, for a given electrical parameters, the tool electrode and the workpiece, EDM milling perform by adjusting the speed of the workpiece infeed. This study builds a mathematical model, based on material erosion rate, elec- trode wear ratio, the electrode compensation accuracy, layer thickness, the discharge gap and other pa- rameters to calculate the speed of the workpiece infeed. The mathematical mode/includes the effects of notching caused by point discharge of the bottom surface of the cylindrical electrode. Finally, through experimental verification verifies the feasibility of the strategy and the mathematical model.