空气中微细电火花沉积与去除可逆加工技术研究  

RESEARCH ON REVERSIBLE ELECTRIC DISCHARGE REMOVAL AND DEPOSITION MACHINING IN GAS

作　　者：王振龙[1] 曹国辉[1] 张永生[1] 赵万生[1] 

机构地区：[1]哈尔滨工业大学机电工程学院,哈尔滨150001

出　　处：《机械工程学报》2004年第11期88-92,共5页Journal of Mechanical Engineering

基　　金：国家自然科学基金资助项目(50275038)

摘　　要：论述了一种新的电火花加工方法。它使用通用的电火花成形加工机床,利用常见的电极材料,在空气介质中,通过脉冲放电在工件表面上沉积生长电极材料,再通过反转极性和适当的轨迹控制对所生成的沉积材料进行有选择的去除加工,进而实现材料的生长与去除可逆加工。通过对电火花加工理论的研究,预测和论证了实现这一新加工方法的可能性和实现条件。通过试验成功地将钢、铜和钨三种电极材料沉积到工件上,形成直径为100-240 μm、高度为1 000-2 500μm的微小圆柱体。并对沉积物进行了选择去除,实现了在同一设备上的可逆电火花加工。对沉积材料的致密性、硬度及其与工件的结合强度等进行了系统的分析,表明沉积物组织致密、坚硬,可以满足功能材料的要求。A new reversible electric discharge machining (EDM) technology is discussed. This method can selective deposite and remove metal materials on workpiece surface by pulse discharge between positive and cathode in gas using ordinary EDM machine tool. The precondition to realize reversible EDM is demonstrated and doped out according to the EDM basic theory. Experiments show that metal electrode materials, such as steel, copper and tungsten, can be deposited on steel work-piece surface and to form micro cylinder which diameter are 100-240 μm and height are 1 000-2 500 μm. Then some EDM removal experiments are carried out to the deposited cylinder by reverse the machining polarity and proper contrail controlling. So the reversible EDM technology is confirmed. Experiments also show that the materials formed by electric discharge deposition is compact and hardness, and combine workpiece surface tightly. Therefore the deposition materials can meet for engineering demand.

关 键 词：电火花加工 电火花沉积 可逆加工 

分 类 号：TG661[金属学及工艺—金属切削加工及机床]