Wear Mechanism  of PCD Tool during Cutting of Isotropic Pyrolytic Graphite

Abstract

Abstract:

According to the rapid tool wear during cutting of isotropic pyrolytic graphite,a turning experiment of isotropic pyrolytic graphite was conducted using PCD tools.The wear formation of PCD tool,tool life and the effects of tool wear on the machined surface were studied.Based on the experimental results and analyses,the results show that the PCD tool wear mainly occurres in the flank face,and the wear forms are abrasive wear and oxidation wear.The wear area can be divided into two kinds of morphology:parallel grooves and severe wear.The length of wear region is increased fast in the first stage. When the cutting distance is larger than 1200m,the cutting tool enters the normal wear stage.Besides,chip accumulation in wear region and tool edge chipping appear in the cutting process.With the increase of cutting distance,the roughness of machined surface increases fast.And the maximum roughness is as 1.7μm when the cutting distance is of 600m.

Key words: isotropic pyrolytic graphite;polycrystalline diamond(PCD) , tool;tool wear;surface roughness

摘要：

针对各向同性热解石墨切削过程中刀具磨损过快的问题，采用聚晶金刚石（PCD）刀具进行了切削加工试验。研究了切削过程中PCD刀具的磨损形式、磨损规律以及刀具磨损对表面加工质量的影响。试验结果表明：PCD刀具磨损主要发生在后刀面上，磨损形式为磨粒磨损和氧化磨损。磨损区域可以分为平行沟槽和严重磨损两种形貌。初始磨损阶段，磨损带长度急剧增大，并在切削1200m后进入正常磨损阶段。切削过程中还出现了石墨切屑在磨损区域的黏附堆积和刀具崩刃现象。切削初期,随着切削距离的增大，加工表面粗糙度值急剧增大,切削距离为600m时表面粗糙度达到最大值1.7μm。

关键词: 各向同性热解石墨, 聚晶金刚石刀具, 刀具磨损, 表面粗糙度

CLC Number:

TH161

Wang Ben, Liu Dongxi, Wang Minghai, Yin Wendian, Zhen Yaohui. Wear Mechanism of PCD Tool during Cutting of Isotropic Pyrolytic Graphite[J]. China Mechanical Engineering, 2015, 26(20): 2721-2729.

王奔, 刘东玺, 王明海, 印文典, 郑耀辉. 聚晶金刚石刀具切削各向同性热解石墨过程中的磨损机理[J]. 中国机械工程, 2015, 26(20): 2721-2729.

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Wear Mechanism of PCD Tool during Cutting of Isotropic Pyrolytic Graphite

聚晶金刚石刀具切削各向同性热解石墨过程中的磨损机理

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