SiC_p/Al复合材料高速铣削加工表面质量及切屑形成机制  

Surface Quanlity and Chip Generation Mechanism of SiC_p/Al Composites during High-Speed Milling

作　　者：葛英飞[1,2] 徐九华[1] 傅玉灿[1] 张帅[1] 边卫亮[1] 

机构地区：[1]南京航空航天大学机电学院,南京210016 [2]南京工程学院机械制造及其自动化江苏省重点建设学科,南京211167

出　　处：《机械工程材料》2012年第2期15-18,27,共5页Materials For Mechanical Engineering

基　　金：国家“863”高技术发展计划项目(2009AA04Z116);江苏省高校自然科学基金资助项目(09KJB460004)

摘　　要：使用聚晶金刚石(PCD)刀具,对碳化硅颗粒增强铝基复合材料(SiCp/Al)进行高速铣削加工,研究了加工表面质量及切屑的形成机制。结果表明:刀具进给波纹、工件材料塑性侧流、刀具-工件相对振动和增强颗粒去除过程留下的孔洞、微裂纹、基体撕裂等是SiCp/Al复合材料高速铣削加工表面的主要形成机制;增大切削速度、使用冷却液、降低增强颗粒体积分数、减小增强颗粒尺寸均有助于提高加工表面质量;切屑形态为不均匀锯齿状,增强颗粒体积分数、热处理状态等对切屑形成有显著影响,绝热剪切、孔洞/微裂纹动态形成和扩展是切屑的主要形成机制。Polycrystalline diamond tools（PCD） were selected to study surface and chip generation mechanisms during high-speed milling SiC-particle-reinforced aluminum matrix composites（SiCp/Al）.The results show that feed marks,materials swelling and side flow,tool-workpiece relative vibration,pits produced during removing reinforment particles,micro-cracks and matrix tearing were the main generation mechanisms of SiCp/Al composites surface during high-speed milling.The machined surface quality could be improved by increasing cutting speed,using coolant,decreasing volume fraction of reinforcement particles,decreasing reinforcement particles size.The chip took uneven sawtooth-like,reinforcement volume fraction and heat treatment condition of matrix had remarkable effects on chip formation.The mechanism of chip were dynamic formation and expending of adiabatic shear,pits and micro-cracks.

关 键 词：SICP/AL复合材料 高速铣削 PCD刀具 切屑形成 加工表面 

分 类 号：TH117.3[机械工程—机械设计及理论]