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工件超声振动对不同放电间隙电火花加工的影响 被引量:4

Influence of Ultrasonic Vibration of Workpiece on Electrical Discharge Machining with Different Discharge Gap
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摘要 为了分析超声振动对不同放电间隙电火花加工的影响,利用Fluent软件对放电间隙为75μm、65μm、55μm和40μm的工件超声振动电火花间隙流场进行数值模拟。研究发现:在工件超声振动作用下,放电间隙的减少可以促进加工液的流动,增加放电间隙流场压力变化范围,同时缩短加工屑从加工间隙排出的时间。搭建试验平台,通过调整放电参数来改变放电间隙的大小,对放电间隙为75μm、65μm、55μm和40μm的工件超声振动电火花进行加工试验。结果表明:放电间隙在75μm到55μm之间时,工件的表面粗糙度随着放电间隙的减小而降低;当放电间隙减少到40μm时,工件表面粗糙度反而升高。结合仿真与试验可知:在一定放电间隙范围内,工件超声振动有助于提高加工精度,当放电间隙过小时,工件超声振动会使加工屑过快排出放电间隙,不利于电火花持续放电,从而造成加工质量的下降。 In order to analyze the effect of workpiece assisted ultrasonic vibration on EDM in different discharge gaps,the flow field of EDM with discharge gaps of 75 μm,65 μm,55 μm and 40 μm were simulated by Fluent software. While the discharge gap is reduced under the ultrasonic vibration of the workpiece,the flow of the dielectric fluid will be promoted,and the range of pressure variation of the flow field will be enlarged. Meanwhile,the time that the metal debris discharged from the machining gap will be shortened. The experiment platform was designed to change the discharge gap by adjusting the discharge parameters. The ultrasonic vibration EDM of workpieces with discharge gaps of 75 μm,65 μm,55 μm and 40 μm were researched. The results show that the surface roughness reduces with the decrease of the discharge gap when the discharge gap is between 75 μm and 55 μm. However,the surface roughness of the workpiece increases when the discharge gap further reduced to 40 μm. According to the simulation and experiment,the workpiece assisted ultrasonic vibration can improve the processing precision in a certain discharge gap range. But when the discharge gap is too small,the workpiece assisted ultrasonic vibration will make metal debris exhaust from the machining gap too quickly and EDM cannot discharge continuously,which result in the decline in processing quality.
出处 《科学技术与工程》 北大核心 2018年第1期222-227,共6页 Science Technology and Engineering
基金 国家自然科学基金(51275490) 山西省自然科学基金(201601D011061) 中北大学研究生创新项目(20161310)资助
关键词 电火花加工 工件超声振动 放电间隙 加工屑 流场仿真 electrical discharge machining ultrasonic vibration of workpiece discharge gap machining debris simulation research on flow field
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