Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第25卷    第9期    总第198期    2015年9月

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文章编号:1004-0609(2015)-09-2517-06
Si3N4基微纳米复合陶瓷刀具的高速切削性能与磨损机理
吕志杰,杨广安,程凯强

(山东建筑大学机电工程学院,济南 250101)

摘 要: 在亚微米Si3N4、TiC颗粒中添加纳米Si3N4、SiC颗粒,采用真空热压烧结工艺制备出STS微纳米复合陶瓷刀具,并对比STS刀具及FD-01刀具在PUMA200MA车削中心干切削淬硬40CrNiMo工件的切削性能。利用扫描电子显微镜(SEM)分析刀具前、后刀面的磨损形态,研究STS陶瓷刀具的磨损机理。结果表明:STS微纳米复合刀具材料具有较高的力学性能,抗弯强度达1000MPa,维氏硬度达19.5GPa。高速干切削40CrNiMo工件时,随着切削速度的增大,刀具后刀面磨损随之增大。切削速度越高,STS刀具优势越明显。两种刀具的磨损形态均主要为月牙洼磨损和后刀面磨损,磨损机制主要为磨粒磨损和粘结磨损。

 

关键字: 微纳米复合材料;陶瓷刀具;40CrNiMo;切削性能;磨粒磨损

Cutting performance and wear mechanism of Si3N4-basedmicro/nano composite ceramics tool in high speed cutting
Lü Zhi-jie, YANG Guang-an, CHENG Kai-qiang

School of Mechanical and Electronic Engineering, Shandong Jianzhu University, Ji’nan 250101, China

Abstract:Si3N4/TiC/SiC (STS) micro/nano composite ceramic tools were fabricated by vacuum hot pressing sintering technique using Si3N4 and TiC submicron particles by adding Si3N4 and SiC nanoparticles. The cutting performance of STS and FD-01 tools in dry high speed machining 40CrNiMo component was studied. The wear morphologies of rake and flank wear were observed by scanning electron microscopy (SEM). The wear characteristic and mechanism were discussed. The results show that STS micro/nano composite tool material has excellent mechanical properties. The flexural strength and hardness are 1000 MPa and 19.5 GPa, respectively. The flank wear increases with the increase of cutting speed in high speed dry machining 40CrNiMo workpiece. STS tool obtains smaller tool flank wear, longer tool life, and is more suitable for high speed cutting under the same cutting condition. The wear forms of both ceramic tools are crater and flank, and the wear mechanisms are mainly adhesive wear and abrasive wear.

 

Key words: micro/nano composite; ceramic tool; 40CrNiMo; cutting performance; adhesive wear

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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