TiN涂层硬质合金刀具切削高锰钢的磨损破损研究  

Wear and Fracture Mechanism of TiN Coated Carbide Tool for Austenitic Manganese Steel Cutting

作　　者：韩桂泉[1,2] 胡喜兰[1] 

机构地区：[1]淮海工学院化学工程系 [2]中国矿业大学北京校区,北京100083

出　　处：《硬质合金》2005年第2期100-103,共4页Cemented Carbides

摘　　要：测绘了切削温度、后刀面磨损量与切削时间或切削速度的关系曲线,分析了刀具前、后刀面显微磨损、破损形貌和化学变化。结果表明,TiN涂层硬质合金刀具切削奥氏体高锰钢时耐磨性优于单一硬质合金刀具,且适于低速切削(小于30m/min)。TiN涂层刀具的磨损、破损机制包括:低速长时间切削时刀尖塑性流动扩展为平行于前刀面的脆裂;中速切削时刀头平行于前刀面脆裂和进而的扩散磨损;高速切削时刀头的韧性断裂。Cutting temperature, relation curves of wear with cutting time and cutting speed, microscopic features and chemical changes of rack face and rear face of the TiN coated tool were measured. The results show that the wear resistant of the TiN coated tool is better than that of a single one. The TiN tool is appropriate for low speed cutting (v<30m/min). The mechanism includes as follows: tool nose flows plastically and extends to brittle fracture in a parallel direction with rack face when the TiN tool works at low speed for a long time; at intermediate speed, tool nose cracks in a parallel direction with rack face and then extends to diffusion wear, and at high speed, tool nose produces a ductile rupture.

关 键 词：涂层硬质合金刀具 TiN 破损 奥氏体高锰钢 切削温度 关系曲线 切削速度 切削时间 化学变化 低速切削 涂层刀具 塑性流动 韧性断裂 高速切削 后刀面 前刀面 磨损量 耐磨性 长时间 脆裂 平行 刀头 刀尖 

分 类 号：TG711[金属学及工艺—刀具与模具]