摘要
放电凹坑大小影响着加工表面形貌的一致性,放电凹坑的凸起高度及凹坑表面的重铸层对加工表面质量有重要影响。文章基于短电弧-电化学复合加工方法,在直流与脉冲两种常用电源类型下对钛合金TC4进行单次放电实验,分析两种电源类型下的短电弧-电化学复合加工单次放电凹坑尺寸及影响规律;结合单次放电凹坑实验所采集到的波形与电弧放电过程仿真模型对电弧放电过程的等离子体放电通道变化进行研究。研究结果发现,直流与脉冲放电凹坑的尺寸与影响规律差异与电弧的断弧方式有关,不同的断弧方式对等离子体放电通道产生影响,直流电弧倾向于通过流体介质运动和极间距离改变进行断弧,而脉冲电弧通过脉冲后沿电压变化和极间距离改变进行熄弧。这两种断弧方式不仅影响了凹坑的尺寸形貌,也影响了断弧后的电化学腐蚀效果。
The size of the discharge craters affects the consistency of the machined surface topography,and the height of the bump and the recast layer of the craters have important effects on the quality of the machined surface.In this paper,based on the short electric arc-electrochemical hybrid machining method,a single discharge experiment was carried out on titanium alloy TC4 under two common power supply types,DC and pulse,and the size and influence rule of single discharge craters in the short electric arc-electrochemical hybrid machining under two power supply types were analyzed.The variation of plasma discharge channel during arc discharge is studied by combining the waveform collected from single discharge crater experiment with the simulation model of arc discharge process.The results show that the difference of the size and influence law of DC and pulse discharge craters is related to the arc breaking mode,and the different arc breaking mode affects the plasma discharge channel.Dc arc tends to break through the movement of fluid medium and the change of electrode distance,while pulsed arc breaks through the change of voltage and electrode distance after pulse.These two arc breaking methods not only affect the size and morphology of the craters,but also affect the electrochemical corrosion effect after arc breaking.
作者
胡国玉
王家豪
周建平
张晟晟
付斐
HU Guoyu;WANG Jiahao;ZHOU Jianping;ZHANG Shengsheng;FU Fei(School of Mechanical Engineering,Xinjiang University,Urumqi 830017,CHN)
出处
《制造技术与机床》
2024年第1期41-47,共7页
Manufacturing Technology & Machine Tool
基金
国家自然科学基金项目“短电弧-电化学复合作用机理及无重铸层高效加工方法研究”(52265060)。
关键词
短电弧-电化学复合加工
电源类型
放电凹坑
放电波形
断弧方式
short electric arc-electrochemical hybrid machining
power supply type
discharge crater
discharge waveform
arc breaking mode
