CAJ | 학술논문

为改善TC4钛合金电火花加工表面质量,减少表面微裂纹、重熔层等表面缺陷,提出了基于电极振动的超声磨料电火花复合加工方法.在煤油工作液中混入12 g/L的SiC磨料粉,进行了有无超声磨料作用的窄脉冲(脉宽小于1 μs)电火花加工的表面粗糙度对比实验研究.实验结果表明:SiC磨料的超声振动作用使零件表面粗糙度R_a由0.5 μm降到0.2 μm左右;重熔层厚度、表面裂纹的扫描电子显微镜(SEM)照片显示,超声磨料作用使重熔层厚度减薄20～30 μm,表面微裂纹得到有效控制;机理分析认为工作液高频振动及磨料对工件的冲击作用,是改善TC4钛合金电火花加工表面质量的主要原因.研究表明磨料的超声振动作用可显著改善TC4钛合金电火花加工的表面质量.
위개선TC4태합금전화화가공표면질량,감소표면미렬문、중용층등표면결함,제출료기우전겁진동적초성마료전화화복합가공방법.재매유공작액중혼입12 g/L적SiC마료분,진행료유무초성마료작용적착맥충(맥관소우1 μs)전화화가공적표면조조도대비실험연구.실험결과표명:SiC마료적초성진동작용사령건표면조조도R_a유0.5 μm강도0.2 μm좌우;중용층후도、표면렬문적소묘전자현미경(SEM)조편현시,초성마료작용사중용층후도감박20～30 μm,표면미렬문득도유효공제;궤리분석인위공작액고빈진동급마료대공건적충격작용,시개선TC4태합금전화화가공표면질량적주요원인.연구표명마료적초성진동작용가현저개선TC4태합금전화화가공적표면질량.
In order to improve the surface quality of titanium alloy TC4 processed by electric discharge machining (EDM), this article presents a new combined machining method of ultrasonic vibration assisted EDM by mixing the kerosene fluid with 12 g/L SiC abrasive particles. By comparing the surface roughness between EDM and the abrasive particle ultrasonic vibration assisted EDM in short pulses (with pulse width less than 1 μs), it is found that the ultrasonic vibration of SiC particles can improve the surface roughness R_a from 0.5 μm to 0.2 μm. The recast layer and surface cracks are analyzed by a scanning electron microscope (SEM). Results show that the thickness of recast layer is reduced by 20-30 μm and surface cracks decreased obviously with the action of abrasive particle ultrasonic vibration. Theoretical analysis indicates that the high frequency vibration of the fluid and the abrasive impulse forces of the abrasive particles on the workpieces are the major factors for improving their surface quality. It demonstrates that the combined action of ultrasonic vibration and abrasive particles can considerably improve the surface quality of titanium alloy TC4 in EDM.