重型切削过程硬质合金刀片的冲击破损行为  

Impact Damage Behavior of the Cemented Carbide Insert in the Heavy Cutting Process

作　　者：刘献礼[1] 刘铭[1] 何耿煌 严复钢[1] 程耀楠[1] 刘利[1] 

机构地区：[1]哈尔滨理工大学'高效切削及刀具'国家地方联合工程重点实验室,哈尔滨150080 [2]厦门金鹭特种合金有限公司,厦门361006

出　　处：《机械工程学报》2014年第23期175-185,共11页Journal of Mechanical Engineering

基　　金：国家自然科学基金资助项目(51175131)

摘　　要：应用机械冲击理论分析重型硬质合金车刀冲击断裂过程,并确立其产生冲击断裂的临界条件;采用有限元仿真的方法,分析研究重型硬质合金车刀冲击断裂产生机理及破损形式,并通过冲击试验揭示硬质合金车刀冲击断裂规律。对重型硬质合金车刀疲劳行为进行研究,通过有限元仿真分析方法,提出动态载荷下硬质合金疲劳断裂产生机制,并给出硬质合金疲劳断裂的载荷条件;通过断续切削试验,研究分析导致硬质合金刀具疲劳行为产生的本质原因,以期为预防硬质合金刀具过早出现失效提供理论支持和借鉴。Impact fracture process of cemented carbide turning tool is analyzed by using mechanics impact theory and the critical condition is also determined when the impact fracture happened. Finite element simulation is used to analyze and research production mechanism and damage form of impact fracture of cemented carbide turning tool, and through impact experiment the impact fracture rules of cemented carbide turning tool is revealed. The fatigue behavior of cemented carbide turning tool is researched, and through finite element simulation, production mechanism of fatigue fracture of cemented carbide under dynamic load is put forward, and the load condition of fatigue fracture of cemented carbide is given. Through intermittent cutting experiment, the essential reason why cemented carbide produced fatigue behavior is analyzed. All above will provide theory support and reference to prevent cemented carbide tool from failure too early.

关 键 词：硬质合金车刀 重型切削 冲击断裂 疲劳断裂 裂纹 

分 类 号：TG712[金属学及工艺—刀具与模具]