端铣Ti40阻燃钛合金的刀具磨损破损形态及其机理  

Wear Behavior and Mechanism of Coated Carbide Tools in Face Milling Ti40 Burn Resistant Titanium Alloy

作　　者：吕东升[1,2] 徐九华[1,2] 丁文锋[1,2] 傅玉灿[1,2] 严凯[1,2] 

机构地区：[1]南京航空航天大学机电学院,江苏南京210016 [2]江苏省精密与微细制造技术重点实验室,江苏南京210016

出　　处：《摩擦学学报》2014年第3期268-277,共10页Tribology

基　　金：江苏省普通高校研究生科研创新计划项目(CXZZ12_0144);中央高校基本科研业务费专项资金资助~~

摘　　要：分别采用油冷和低温喷雾射流冷却方法开展了涂层硬质合金刀具端铣Ti40阻燃钛合金试验,结合铣削力和铣削温度,对刀具磨损破损形态及其磨损机理进行了系统研究.结果表明:涂层硬质合金刀具在铣削Ti40阻燃钛合金时主要磨损形式为前刀面月牙洼磨损和后刀面边界磨损;前后刀面破损形态主要表现为涂层贝壳状剥落、裂纹和微崩刃.磨损机理主要是黏结磨损、磨粒磨损、氧化磨损及疲劳破损的综合作用.铣削高温是造成硬质合金刀具快速磨损的主要原因.低温喷雾射流冷却方式明显降低了铣削温度,减轻了刀具黏结磨损、氧化磨损,同时抑制了刀具边界磨损的发展速度,因而大幅度提高了刀具的耐用度.Face milling experiments on Ti40 titanium were conducted using coated carbide tools in two kinds of cooling modes,i. e. oil cooling and cryogenic pneumatic mist jet impinging cooling(CPMJC). The wear patterns of tool and its corresponding mechanism,milling temperature and milling force were investigated. By analyzing experimental results,it is found that wear patterns of coated carbide tools included rake face wear and flank wear in face milling Ti40 burn resistant titanium alloy. The former was crater wear and the latter was boundary groove wear. The damage morphologies were conchoidal coating spallation,fatigue crack and micro-chipping of cutting edge. Wear mechanisms were synergistic interaction among adhesion wear,abrasion wear,oxidation wear and fatigue damage. The experimental results demonstrate that high milling temperature was the leading factor that affected life of tool in face milling Ti40 titanium. CPMJC mode could reduce milling temperature drastically,alleviate adhesion and oxidation,and simultaneously restrain the groove wear development. Therefore,CPMJC improved tool life remarkably.

关 键 词：阻燃钛合金 端铣 刀具磨损 刀具破损 涂层硬质合金 低温喷雾射流 

分 类 号：TG71[金属学及工艺—刀具与模具] TH117[机械工程—机械设计及理论]