论文部分内容阅读
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12g/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1μs)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Ra由0.5μm降到0.2μm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20～30μm,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。
In order to improve the surface quality of TC4 titanium alloy EDM and reduce surface defects such as surface micro-cracks and remelting layers, a ultrasonic EDM machining method based on electrode vibration was proposed. In the kerosene working solution mixed with 12g / L SiC abrasive powder, with or without ultrasonic abrasive narrow pulse (pulse width less than 1μs) EDM surface roughness comparison experimental study. The experimental results show that the ultrasonic vibration of SiC abrasive reduces the surface roughness Ra of the part from 0.5μm to about 0.2μm. The thickness of the remelted layer and the SEM image of the surface crack show that the effect of ultrasonic abrasive to the thickness of the remelted layer Thinning 20 ~ 30μm, surface micro-cracks are effectively controlled; mechanism analysis that the high-frequency vibration of the working fluid and abrasive impact on the workpiece, is to improve the TC4 titanium alloy EDM surface quality of the main reasons. The results show that the ultrasonic vibration of abrasive can significantly improve the surface quality of TC4 titanium alloy EDM.