陶瓷刀具高速干切削等温淬火球铁(ADI)磨损性能研究

采用陶瓷刀具(CC650)对等温淬火球墨铸铁(以下简称AD I)进行干式高速切削试验,用带有X射线能谱分析的扫描电镜观察刀具表面的磨损形貌,并对刀具磨损微区和工件表面成分进行定性分析,用X射线衍射仪对刀具、工件和切屑等试样进行物相分析,研究高速切削时陶瓷刀具磨损性能及磨损机制。结果表明:切削速度是影响刀具寿命的主要因素;CC650刀具高速干切削AD I时形成的刀具主后刀面和前刀面的磨损形态基本类似中、低速条件下磨损形态,主要区别在其磨损区域紧靠切削刃,最大磨损部位位于切削刃附近;CC650刀具高速切削AD I时切削温度高,其磨损是机械磨损与化学磨损综合作用的结果,磨损机制主要包括磨料磨损、扩散磨损、粘结磨损和微崩。

Study on Ceramic Cutter's Wear Behavior When High Speed Dry Cutting Austempered Ductile Iron

The high-speed dry cutting experiment was done to Austempered Ductile Iron(ADI) with ceramic cutting tools(CC650).The wear shape of the cutter's surface was observed by means of SEM(Scanning Electron Microscope) with X-rays EDS(Energy Dispersive Spectrometry).Qualitative analysis of the cutter's wear and composition of workpiece's surface was done with EDS.The microstructure analysis on cutting tools,workpiece and chips was carried out by means of XRD(X-ray-diffraction).The wear mechanism and performance of the ceramic cutting tools were also discussed when high-speed dry cutting.The results show that the cutting speed is the main factor to affect the tool life;wear form of the main tool flank and rake face when ADI is free dry cut with CC650 is basically similar to the forms at the mediate and low speed,the main difference lies in that most wear place is next to the cutting lip while the wear area is tightly next to the cutting lip;the cutting temperature is high when high-speed dry cutting is done to Austempered Ductile Iron(ADI) with CC650,the wear mechanism is the result of the integrate action between mechanical wear and chemical wear,wear mechanics mainly contains abrasive wear,adhesive wear,diffusive wear and chipping of tool.