纵扭超声振动电火花加工微小孔仿真研究

超声振动电火花加工是一种高效加工微小孔的新型加工方法，能够提高加工效率与精度。对纵扭超声振动电火花加工微小孔进行研究，建立描述电极丝周围间隙工作液流动特性的数学模型，使用Fluent对数学模型进行验证，同时加入切屑，对间隙工作液运动情况以及排屑情况进行探究。结果表明：在电火花加工时，在电极丝引入纵扭超声振动，流体域有明显的扭转运动，电极丝底部切屑在离心力的作用下，更易从底隙中进入侧隙，随工作液的运动排出孔隙，有效防止底部产生切屑堆积，提高了电火花加工微小孔的精度。

Simulation of Micro-hole Machining by Longitudinal-Torsional Ultrasonic EDM

Ultrasonic vibration electrical discharge machining (EDM) is a new machining method for machining micro-holes with high efficiency,which can improve the machining efficiency and accuracy.Micro-hole machining by longitudinal-torsional ultrasonic vibration EDM was studied.A mathematical model was established to describe the flow characteristics of the working fluid in the clearance around electrode wire,and Fluent was used to verify the mathematical model.At the same time,the debris was added to explore the movement of the working fluid in the clearance and debris removal.The results show that during EDM,the longitudinal-torsional ultrasonic vibration has obvious torsional motion in the fluid domain.Due to the increase of the torsional motion,it is beneficial for the debris to enter the side gap from the bottom gap,and to be discharged from the holes with the flow of the working fluid.The debris accumulation at the bottom is effectively prevented,which can improve the accuracy of the EDM hole.