复合Si_3N_4刀具切削高锰钢时的磨损、破损机理  

Wear and Fracture Mechanism of Compound Si_3N_4 Toolfor Austenitic Manganese Steel Cutting

作　　者：张增志[1] 曹鹏[1] 张利梅[1] 白兵占[1] 李文龙[1] 

机构地区：[1]中国矿业大学北京校区机电工程学院,北京100083

出　　处：《润滑与密封》2003年第6期58-60,共3页Lubrication Engineering

摘　　要：研究了复合Si3 N4刀具切削难加工的高锰钢时的磨损、破损机理。通过试验测量了刀具后刀面磨损宽度分别与切削时间和切削速度的关系 ,用扫描电镜显微分析了复合Si3 N4的磨损和破损形貌和元素变化。结果表明 ,随着切削时间的延长 ,Si3 N4刀具表面依次出现积屑瘤、扩散磨损和机械、扩散、粘结复合型磨损形式 ;刀具的破损形式分别发生在高速切削初期的脆性断裂和长时间切削导致的热震破裂 ;刀具的最佳切削速度为 6 0～ 70m/min。The wear and fracture mechanism of compound Si 3N 4 tool was researched when it worked on austenitic manganese steel, a hardworking material.By the test, the relations between rear face’s wear breadth and cutting time or cutting speed were measured separately. The wear and fracture microscopic features and chemical changes of compound Si 3N 4 tool were analyzed by means of scanning electron microscope. The results show that, as times goes on, there are built up edge,diffusion wear and complex wear which is composed of mechanical wear, diffusion wear and binding wear on the surface of the Si 3N 4 tool successively. The tool’s fracture happens separately to be brittle fracture during the first period of high speed cutting and to be heat shock fracture caused by long time cutting. The best cutting speed of the tool is 60～70 m/min.

关 键 词：刀具 高锰钢 切削 磨损 破损 氮化硅陶瓷 

分 类 号：TG711[金属学及工艺—刀具与模具]