SiC_(p)/Al二维超声复合电解/放电加工的表面生成机理及试验研究  

Surface Generation Mechanism and Experimental Study of SiC_(p)/Al on Two-dimensional Ultrasonic Vibration Composited Electrochemical/Electrical Discharge Machining

作　　者：李晶 陈湾湾 朱永伟[1] LI Jing;CHEN Wanwan;ZHU Yongwei(College of Mechanical Engineering,Yangzhou University,Yangzhou 225127)

机构地区：[1]扬州大学机械工程学院,扬州225127

出　　处：《宇航材料工艺》2023年第6期40-47,共8页Aerospace Materials & Technology

基　　金：国家基金资助(52175438,51775484):江苏省研究生集萃研究计划资助。

摘　　要：针对复合材料高质量的加工要求,结合各加工技术的优点,本文提出二维超声复合电解/放电加工技术(2UECM/EDM),并对其表面生成机理进行深入研究。利用二维超声辅助磨削加工时单磨粒的运动轨迹对加工表面沟槽的加宽作用和电解/放电加工的整平作用,通过研磨面积比(δ_(s))来分析复合材料表面形貌和表面粗糙度(Ra)的变化规律,并进行了复合材料SiC_(p)/Al维超声复合电解/放电加工的表面生成机理对比试验。结果表明,单周进给距离、电压和二维超声振幅等参数影响加工表面质量。其中,表面粗糙度与磨粒单周进给距离的变化趋势一致;较高电压时电解/放电加工效应显著,导致增强颗粒裸露进而增加了Ra;轴向和切向二维振动共同作用下显著增大δ_(s)值,而其值在1.8附近时Ra出现明显的转折变化趋势。因此,当δ_(s)大于1.8时的工具和工件振幅以及较低电压参数,加工时对增强颗粒的拖曳和碾压可以显著降低表面不平度、较大幅度提高工件表面质量。According to the requirements of high quality machining of composite materials and the advantages of various machining technologies,the two-dimensional ultrasonic vibration composited electrochemical/electrical discharge machining(2UECM/EDM)is proposed in this paper,and surface formation mechanism is deeply studied.Benefiting from the widening of the grooves of the machined surface by the single abrasive particle motion and the levelling effect of electrochemical/electrical discharge machining,the change in the surface topography and surface roughness(Ra)of composite materials were analyzed by the grinding area ratio(δ_(s)).Surface formation mechanism of 2UECM/EDM was experimentally compared.The results show that single-cycle feed distance,voltage and two-dimensional ultrasonic amplitude affect the surface quality.Among them,the trend of Ra change is consistent with the feed distance of abrasive particles in a single cycle.The effect of electrochemical/electrical discharge machining is obvious at higher voltage,which leads to the exposure of reinforced particles and increases Ra.Theδ_(s) increases significantly under axial and tangential vibration,and Ra shows an obvious turning trend near 1.8.Therefore,when greaterδ_(s) amplitude and lower voltage are selected,the dragging and rolling of the reinforced particles during processing can significantly reduce Ra and greatly improve the surface quality of the workpiece.

关 键 词：二维超声 电解/放电加工 表面粗糙度 表面质量 

分 类 号：TG663[金属学及工艺—金属切削加工及机床]