摘要
单次火花放电过程中存在工具电极表面喷爆出的金属蒸汽,不同电极材料产生的金属蒸汽炬会携带不同的能量传递到工件表面,进而对工件表面能量的获得及放电痕尺寸产生不同的影响。基于电火花加工放电过程中能量分配及电极金属蒸汽炬能量理论,对工件获得能量及蒸汽炬能量传递机理进行分析,利用ANSYS建立电火花加工表面热源与材料蚀除仿真模型,采用不同工具电极材料进行放电加工实验。研究表明:在一定误差范围内,仿真模型能够预测表面热源及放电痕尺寸。采用大密度和高沸点的钨材料作为工具电极可以传递更多的能量并产生大尺寸的放电痕,但放电痕尺寸也受到蒸汽喷射量和蒸汽炬力冲击的影响。
During a spark discharge,the metallic vapor torch is jetted from the surface of tool electrode. Vapor torch produced by different electrode materials carries different energy to transfer the surface of the workpiece,which affects the different discharge crater formation and material erosion on the workpiece. Based on the energy theory of vapor torch on the electrode metal in electro-discharge machining(EDM),energy on workpiece and energy transfer mechanism of vapor torch were analyzed.A simulation model of surface heat source and material removal in discharge process was established by ANSYS. The experiment are used by electrodes of different material. The results of research shows that the simulation model can predict the surface heat source and discharge crater size.In order to produce larger discharge crater and more energy transfer,the material with high density and high boiling point can be used as tool electrodes. At the same time,the size of discharge crater is also affected by quantity of vapor torch and force.
作者
常皓
王文建
张文超
刘宇
CHANG Hao;WANG Wen-jian;ZHANG Wen-chao;LIU Yu(Department of Mechanical Engineering,Zhengzhou Technical College,He*nan Zhengzhou 450121,China;Shaanxi Railway Institute,Shaanxi Weinan 714000,China;School of Mechanical Engineering and Automation,Dalian Polytechnic University,Liaoning Dalian 116034,China;School of Mechanical Engineering,Dalian Jiaotong University,Liaoning Dalian 116028,China)
出处
《机械设计与制造》
北大核心
2021年第12期154-158,共5页
Machinery Design & Manufacture
基金
国家自然科学基金资助项目(51875074)
河南省科技攻关项目(212102210314、212102210337)。
