Ti-6Al-4V钛合金超声振动辅助短电弧复合加工实验研究  

Experimental Study on Short Arc Composite Machining of Ti-6Al-4V Titanium Alloy Assisted by Ultrasonic Vibration

作　　者：丁胜威 周建平[1] 周碧胜[1] 王子健 苗李君 DING Shengwei;ZHOU Jianping;ZHOU Bisheng;WANG Zijian;MIAO Lijun(School of Mechanical Engineering,Xinjiang University,Urumqi Xinjiang 830047,China)

机构地区：[1]新疆大学机械工程学院,新疆乌鲁木齐830047

出　　处：《机床与液压》2024年第13期50-58,共9页Machine Tool & Hydraulics

基　　金：国家自然科学基金项目(52265061)。

摘　　要：针对普通短电弧加工排屑不畅引起的电极和工件之间形成颗粒桥造成短路、局部放电和二次放电等非正常放电现象,提出一种超声振动辅助短电弧加工的新方法来改善工件加工质量。通过实验对普通短电弧和复合加工后工件宏观特征和微观形貌进行对比。采用超景深显微镜、电子扫描显微镜等对加工后的表面形貌、粗糙度和元素能谱进行检测分析。结果表明:两种特种加工技术耦合后的工件表面形貌发生了变化,其表面纹路在超声作用下呈现无序化、均匀化,电蚀凹坑和表面微裂纹数量显著减少,重铸层厚度深铣削加工下从93.06μm降低至25.39μm,表面粗糙度降低16%以上,同时材料表面元素发生了改性。这为短电弧技术改善加工质量、材料改性、技术耦合的发展提供了一种新的思路。In view of the abnormal discharge phenomena such as short circuit,partial discharge and secondary discharge caused by particle bridge between electrode and workpiece because of poor chip removal in common short arc machining,a new method of ultrasonic vibration assisted short arc machining was proposed to improve the machining quality of workpiece.The macroscopic characteristics and microscopic morphology of the workpiece after common short arc and composite machining were compared by experiments.The surface morphology,roughness and energy spectrum of the machined surface were measured and analyzed by ultra-depth microscope and electron scanning microscope.The results show that:after the coupling of the two special processing technologies,the surface topography of the workpiece has changed,the surface texture is disordered and homogenized under the action of ultrasonic,the number of electric pitting and surface micro-cracks are significantly reduced,the thickness of the recast layer is reduced from 93.06μm to 25.39μm under deep milling,the surface roughness is reduced by more than 16%,and the surface elements of the material are modified.This provides a new way for short arc technology to improve machining quality,material modification and technology coupling development.

关 键 词：超声振动 短电弧技术 加工质量 微观形貌 钛合金加工 

分 类 号：TG661[金属学及工艺—金属切削加工及机床]