TiN涂层刀具对20CrMo钢的干切削性能的影响及磨损机理  

Effect of TiN coated tools on machinability and wear mechanism in dry turning of 20CrMo steel

作　　者：韩文强[1] 何辉波[1] 李华英[1] 冉春华[2] 杨俊[1] 

机构地区：[1]西南大学工程技术学院,重庆400715 [2]西南大学材料科学与工程学院,重庆400715

出　　处：《中南大学学报（自然科学版）》2014年第1期64-70,共7页Journal of Central South University:Science and Technology

基　　金：重庆市自然科学基金资助项目(CSTC2011BB4013);中央高校基本科研业务费专项资金资助项目(XDJK2012C002;XDJK2013D015);国家留学基金委西部地区人才培养特别项目(201208505038)

摘　　要：为了研究TiN涂层的摩擦性能及TiN涂层刀具对金属切削性能的影响,采用电弧离子镀工艺在45号钢基体和可转位硬质合金车刀YG6上沉积TiN涂层。采用球-盘式摩擦磨损实验仪对45号钢基体和TiN薄膜的干式摩擦学行为进行研究,用TiN涂层和未涂层的YG6车刀在CA6140A普通车床上对20CrMo钢进行干切削,对2种刀具切削过程中的切削力、工件表面质量及刀具磨损程度进行研究。研究结果表明：TiN薄膜和45号钢基体的平均摩擦因数为0.25和0.29;与未涂层刀具相比,TiN涂层刀具切削20CrMo钢时的主切削力可减小20%-40%,刀具耐磨性能约提高45%,寿命提高2倍左右,加工表面质量也明显提高;TiN涂层刀具前刀面的主要磨损机理是磨粒磨损,附带有黏结磨损、氧化磨损和扩散磨损。In order to explore the tribological properties of TiN films and the cutting performance of TiN coated carbide tools, TiN films were deposited on No.45 steel and YG6 indexable turning tools by Arc Ion Plating technique. The dry tribological behavior of the substrate and TiN films were tested in a ball-on-disk tribometer. The dry turning tests of 20CrMo steel were carried out with TiN coated and uncoated carbide tools on the CA6140A lathe. The effect of the two kinds of tools on cutting forces, surface qualities and tool wear was investigated to assess the performance of TiN coated tools. The results show that the friction coefficients of coatings and substrate are 0.25 and 0.29, respectively. In contrast to the uncoated YG6 tool, the cutting forces of coated tool are decreased by 20%-40%, and the flank wear resistance enhances by 45%, and life is improved by 200%. The coated cutting tools obviously outperform those uncoated tools in surface finish. The wear mechanisms of TiN coated tool in dry machining of 20CrMo steel is mainly abrasive wear, accompanied with adhesive, diffusion and oxidation wear.

关 键 词：TiN涂层刀具 干切削 切削力 刀具磨损 

分 类 号：TH161[机械工程—机械制造及自动化]