涂层PcBN刀片切削球墨铸铁的试验研究  

Experimental Study on Cutting Ductile Iron with Coated PcBN Inserts

作　　者：彭凌洲 陈响明 郭喜平[3] Peng Lingzhou;Chen Xiangming;Guo Xiping(Zhuzhou Cemented Carbide Cutting Tools Co.,Ltd.,Zhuzhou Hunan 412000,China;State Key Laboratory of Cemented Carbide,Zhuzhou Hunan 412000,China;State Key Laboratory of Solidification Technology,Northwestern Polytechnical University,Xian Shanx 710072,China)

机构地区：[1]株洲钻石切削刀具股份有限公司,湖南株洲412000 [2]硬质合金国家重点实验室,湖南株洲412000 [3]西北工业大学凝固技术国家重点实验室,陕西西安710072

出　　处：《硬质合金》2024年第2期123-132,共10页Cemented Carbides

基　　金：国家科技重大专项(SK201901A31-04)。

摘　　要：采用多种涂层PcBN刀片对球墨铸铁QT500-7进行车削试验,研究未涂层及不同涂层材质PcBN刀片的加工寿命、磨损形态及机理和涂层防护机理。试验结果表明:1)在相同切削条件下,涂层后的PcBN刀片的加工寿命明显提高;2)涂覆CVDα-Al_(2)O_(3)涂层PcBN刀片加工寿命最长,其次是涂覆PVD TiAlSiN涂层PcBN刀片,最后是涂覆PVD TiAlN涂层PcBN刀片;3)PcBN刀片磨损形态主要是前刀面磨损、后刀面磨损、微崩刃和破损,其磨损机理不仅有机械磨损,还有粘结磨损、扩散磨损及氧化磨损,这些磨损机理是同时发生的,并且相互影响;4)涂层作为化学和热屏障,在PcBN刀片与工件间能够形成“隔离层”,减少刀片与工件间的机械磨损、扩散磨损和粘结磨损,并有效阻碍了氧化磨损,进而避免刀片过早出现微崩刃或破损,提高其加工寿命。In this paper,a variety of coated PcBN inserts were used to turn test on nodular cast iron QT500-7,and the processing life,wear patterns and mechanism and coating protection mechanisms of uncoated and different coated PcBN inserts were studied.The test results show that the machining life of the coated PcBN insert is improved under the same cutting conditions.The coated PcBN insert with CVD α-Al_(2)O_(3) has the longest processing life,followed by the PcBN insert coated with PVD TiAlSiN,and then the PcBN insert coated with PVD TiAlN with the shortest processing life.The wear patterns of the PcBN insert mainly include front insert wear,back insert wear,micro-edge breakage and damage.The wear mechanisms include not only mechanical wear but also adhesive wear,diffusion wear,and oxidation wear.These wear mechanisms occur simultaneously and affect each other.As a chemical and thermal barrier,the coating can form an“isolation layer”between the PcBN insert and the workpiece,reducing mechanical wear,diffusion wear,and bonding wear between the insert and the workpiece,and effectively preventing oxidative wear,thereby avoiding premature micro-breakage or breakage of the insert and improving its processing life.

关 键 词：PcBN刀片 涂层 球墨铸铁 磨损形态 磨损机理 

分 类 号：TG506.7[金属学及工艺—金属切削加工及机床]