涂层刀具铣削HT350高强度氮型灰铸铁的磨损机理研究  

Study on Wear Mechanism of Coated Tool Milling High-strength Nitrogen-type Gray Cast Iron HT350

作　　者：林勇传[1] 张境如 赖德斌 杨淦贵 侯彦辰 何春华[2] Lin Yongchuan;Zhang Jingru;Lai Debin;Yang Gangui;Hou Yanchen;He Chunhua(School of Mechanical Engineering,Guangxi University,Nanning 530004,China;不详)

机构地区：[1]广西大学机械工程学院 [2]广西玉柴机器股份有限公司

出　　处：《工具技术》2024年第3期73-79,共7页Tool Engineering

基　　金：国家自然科学基金面上项目(22272035);广西自然科学基金(2020JJA160030);广西科技重大专项(2020AA09001AA)。

摘　　要：为探究HT350高强度氮型灰铸铁的铣削性能,选用PVD涂层硬质合金刀具和CVD涂层硬质合金刀具对HT350高强度氮型灰铸铁进行铣削试验,对比研究两种刀具的磨损形貌,通过极差分析探究切削三因素对磨损带宽的影响,并对磨损区的元素分布进行了观测。结果表明:相同铣削用量条件下,PVD涂层刀具前刀面的磨损情况比CVD涂层刀具更严重,铣削速度V_(c)对刀具的磨损带宽影响最大,其次是背吃刀量a_(p),最小是进给量f_(z)。在低切削速度(V_(c)=100~200m/min)时,刀具磨损以磨粒磨损和黏结磨损为主;在高切削速度(V_(c)=200~250m/min)时,刀具磨损以扩散磨损和氧化磨损为主。PVD涂层中的TiAlN被氧化生成Al_(2)O_(3),同时Al_(2)O_(3)在加工过程中不断剥落,导致PVD涂层刀具的磨损情况更加严重。In order to investigate the milling performance of high-strength nitrogen-type gray cast iron,PVD coated carbide tool and CVD coated carbide tool are selected for milling test of high-strength nitrogen-type gray cast iron,the wear morphology of the two tools is comparatively studied,the effect of cutting three factors on the wear bandwidth is investigated by analysis of variance,and the distribution of elements are observed in the wear zone.The results show that the wear of the front face of the PVD-coated tool is more severe than that of the CVD-coated tool at the same milling dosage,and the milling speed V_(c) has the greatest influence on the wear bandwidth of the tool,followed by the back draft a_(p) and the least by the feed f_(z).At low cutting speeds(V_(c)=100~200m/min),the tool wear is dominated by abrasive and bond wear,at high cutting speeds(V_(c)=200~250m/min),tool wear is dominated by diffuse wear and oxidation wear.The PVD coated TiAlN is oxidized to generate Al_(2)O_(3),while Al_(2)O_(3) keeps flaking off during the machining process,resulting in more serious wear of PVD coated tools.

关 键 词：氮型灰铸铁 涂层刀具 铣削 刀具磨损机理 

分 类 号：TG54[金属学及工艺—金属切削加工及机床] TH117.1[机械工程—机械设计及理论]