镍基合金高速切削中锯齿状切屑毛边和刀具磨损研究

Study on Saw-tooth-shaped Chip Edge and Tool Wear for High-speed Machining of Nickel-based Superalloy

基于等腰三角形悬臂梁切屑毛边假设,建立了切屑毛边对刀具前刀面和切削刃的冲击强度、冲击频率模型。通过该模型,计算了不同切削速度下切屑毛边的冲击强度和冲击频率;通过扫描电镜和能谱分析,对切屑底部元素和刀具表面进行了分析。结果表明,锯齿状切屑毛边是造成沟槽磨损的重要原因。

Based on the hypothesis of isosceles triangle cantilever, a model was established to calculate the impact force and impact frequency of saw-tooth-shaped chip edge on the tool rack face and tool edge. Through this model, the impact force and impact frequency of saw-tooth-shaped chip edge in different cutting speeds were calculated; the chip＇ s bottom surface and tool surface were investigated by scanning electron microscope （SEM） equipped energy dispersive X-ray spectroscopy （EDS）. The results show that the saw-tooth-shaped chip edge is an important cause of occurrence of notch wear.