刀具磨损对FGH96试件加工表面完整性及疲劳性能的影响  

Effect of tool wear on machined surface integrity and fatigue properties of FGH96 specimen

作　　者：赵文硕 郑光明[1,2] 张鸿滨 纪任可 李勋 ZHAO Wenshuo;ZHENG Guangming;ZHANG Hongbin;JI Renke;LI Xun(School of Mechanical Engineering,Shandong University of Technology,Zibo 255000,China;Shandong Provincial Key Laboratory of Precision Manufacturing and Non-traditional Machining,Zibo 255000,China;School of Mechanical Engineering&Automation,Beihang University,Beijing 100191,China)

机构地区：[1]山东理工大学机械工程学院,淄博255000 [2]山东省精密制造与特种加工重点实验室,淄博255000 [3]北京航空航天大学机械工程及自动化学院,北京100191

出　　处：《现代制造工程》2023年第3期8-14,共7页Modern Manufacturing Engineering

基　　金：国家自然科学基金项目(51875028)。

摘　　要：粉末冶金高温合金FGH96的切削加工性极差,加工过程中刀具磨损严重,直接影响零件的加工表面质量和疲劳寿命。采用涂层刀具车削FGH96试件,研究刀具磨损对FGH96试件加工表面完整性及疲劳性能的影响规律。结果表明,随着刀具磨损量(刀具后刀面磨损量)的增加,试件表面粗糙度Ra会随之增大,加工表面显微硬度则逐渐减小;加工表面残余应力均表现为残余压应力状态,且残余应力绝对值随着刀具磨损量的增加而增大;加工表面塑性变形层深度则随着刀具磨损量的增加而加深。同时,当刀具磨损量VB≤0.15 mm时,在试件表面完整性的综合影响下,试件的疲劳寿命下降幅度较小;当刀具磨损量VB>0.15 mm后,试件的疲劳寿命则急剧下降;因此,为保证FGH96试件车削加工后的疲劳寿命,车削刀具的磨损量VB应控制在0.15 mm以内。The machinability of powder metallurgy superalloy FGH96 is extremely poor,and the tool wear is serious during machining,which directly affects the machined surface quality and fatigue life of parts.FGH96 specimens were turned with coated tools.The influence of tool wear on the machined surface integrity and fatigue performance of FGH96 specimens was studied.The results show that with the increase of tool wear(tool flank wear),the surface roughness Ra increases and the machined surface microhardness decreases;The residual stress on the machined surface was in the state of residual compressive stress,and the absolute value of residual stress increases with the increase of tool wear;The depth of plastic deformation layer on the machined surface deepens with the increase of tool wear.At the same time,when the tool wear VB was less than 0.15 mm,the fatigue life of the specimen decreases slightly under the comprehensive influence of the surface integrity of the specimen,and when the tool wear VB was more than 0.15 mm,the fatigue life of the specimen decreases sharply.Therefore,in order to ensure the fatigue life of FGH96 specimen after turning,the wear VB of turning tool should be controlled within 0.15 mm.

关 键 词：刀具磨损 加工表面完整性 疲劳性能 粉末冶金高温合金FGH96 车削 

分 类 号：TH162.1[机械工程—机械制造及自动化] V263.14[航空宇航科学与技术—航空宇航制造工程]