中文摘要：

提出一种方孔电火花加工新方法,利用具有勒洛三角形截面形状的工具电极在等宽方形约束孔中转动,使电极沿横截面扫过一个正方形区域,从而通过电极底面放电加工出方孔。分析了勒洛三角形电极在与其等宽的方孔中的运动方式和轨迹,设计了基于旋转电极的方孔电火花加工装置,通过实验验证了该方法的可行性。在不同的开路电压下,分别利用旋转的勒洛三角形电极和不旋转的方形电极进行方孔加工,发现旋转的勒洛三角形电极加工效率更高、电极损耗更低。

英文摘要：

A new EDM method for square hole was proposed. With this method,the tool electrode with the cross section of the reuleaux triangle shape was used and rotates in an equal-width square constraint hole. Due to the electrode can scan a square area in the cross direction by its rotating,the square hole can be machined by the bottom discharge of the tool electrode. The motion form and motion trajectory of the reuleaux triangle electrode in an equal-width square hole was analyzed,and then the EDM device for square hole machining was designed and installed. The machining of the square hole was realized by rotating reuleaux triangle tool electrode successfully. The experiments of square hole machining were carried out with reuleaux triangle electrode and square electrode under the different open gap voltage respectively. The experiment results indicates the new method proposed in this research can improve the processing efficiency and electrode wear obviously.