聚晶金刚石电火花超声机械复合加工技术研究

摘要

Due to their excellent performances such as mechanical, thermal, chemical, optical and electrical properties, polycrystalline diamond (PCD) are widely used in many fields. However, having high hardness and high wear resistance, PCD compacts are very hard to be machined. Electrical discharge and ultrasonic-assisted mechanical combined machining is an ideal method for PCD processing. On the basis of analyzing the principle of the combined method, the electrical discharge and ultrasonic-assisted mechanical combined machining process was realized by using bronze-bonded diamond grinding wheel. The relevance of the machining effects and the parameters of the combined machining method were studied. The experiment results show that parameters of pulse width, pulse interval, peak current, ultrasonic amplitude and open-circuit voltage affect the machining effects distinctly.%聚晶金刚石具有优良的力、热、化学、声、光、电等性能,在现代工业、国防等领域中得到日益广泛的应用.但是,聚晶金刚石硬度高,耐磨性好,其成型加工非常困难,超声电火花机械复合加工技术是一种有效的加工方法.本研究在分析电火花超声机械复合加工原理的基础上,采用青铜结合剂金刚石砂轮实现了聚晶金刚石的超声电火花机械复合加工.实验分析了超声电火花机械复合加工过程工艺参数与加工效果之间的关系,结果表明,脉宽、脉间、峰值电流、超声振幅、开路电压等参数对复合加工过程工艺结果的影响程度较明显.