关键词: 电火花成形加工, 电极, 平动, 数控, 流场结构, 气动特性, 气动阻力, 转向架

Abstract: There is machining error in electrical discharge mac- hining (EDM) due to the electrode’s orbiting. The NC (Numerical controf)-based method is proposed to eliminate the error, by modifying the NC codes of electrode 3D model according to the orbit pattern and orbit radius in EDM. Based on the method, a software system is built to process NC codes. Prior to the electrode machining, this software system processes the NC codes which is used to machine electrode and outputs the new NC codes which has the same format with the old one and can be used to machine electrode. Several experiments are made to test this method, and show that the NC-based method can effectively improve machining precision in EDM.

Key words: Electrical discharge machining (EDM), Electrode, Numerical control (NC), Obit, Aerodynamic drag, Bogie, Flow field structure, Aerodynamic performance