陶瓷刀具高速切削镍基高温合金沟槽磨损试验研究

Experimental Studies on Notch Wear for High Speed Machining of Nickel-based Superalloy with Ceramic Tools

通过陶瓷刀具高速切削镍基高温合金试验,计算了不同速度下切屑毛边对刀具前刀面和切削刃的冲击频率,分析了切屑毛边对沟槽磨损形成的影响;设计了去毛刺试验台,对比分析了去毛刺切削和常规切削时待加工表面切削毛刺尺寸和刀具沟槽磨损的大小。通过扫描电镜和能谱分析,对刀具沟槽磨损部位进行了观测与分析。试验结果表明,侧向切削毛刺和锯齿状切屑毛边是造成沟槽磨损的根本原因,黏结是加速沟槽磨损的重要因素。

Based on the experiments of high speed machining of nickel- based superalloy with ceramic cutters,the impact frequencies of the saw-tooth-shaped chip edge on rake face and cutting edge in different speeds were calculated and the influence of chip edge on notch wear formation was analyzed. A new tool table was used to dehurr in the experiments, and the height of burr on the working surface with the size of notch wear was compared in deburring cutting and normal cutting. The depth of cut zone（DOC-zone） was investigated by scanning electron microscope（SEM） equipped energy dispersive x-ray spectroscopy（EDS）. The results show that the side cutting burr and saw-tooth-shaped chip edge are the ultimate cause of occurrence of notch wear and adhesion accelerates the development of notch wear.