(山東建筑大學(xué)機(jī)電工程學(xué)院，濟(jì)南 250101)
摘 要: 在亞微米Si3N4、TiC顆粒中添加納米Si3N4、SiC顆粒，采用真空熱壓燒結(jié)工藝制備出STS微納米復(fù)合陶瓷刀具，并對(duì)比STS刀具及FD-01刀具在PUMA200MA車削中心干切削淬硬40CrNiMo工件的切削性能。利用掃描電子顯微鏡(SEM)分析刀具前、后刀面的磨損形態(tài)，研究STS陶瓷刀具的磨損機(jī)理。結(jié)果表明：STS微納米復(fù)合刀具材料具有較高的力學(xué)性能，抗彎強(qiáng)度達(dá)1000MPa，維氏硬度達(dá)19.5GPa。高速干切削40CrNiMo工件時(shí)，隨著切削速度的增大，刀具后刀面磨損隨之增大。切削速度越高，STS刀具優(yōu)勢(shì)越明顯。兩種刀具的磨損形態(tài)均主要為月牙洼磨損和后刀面磨損，磨損機(jī)制主要為磨粒磨損和粘結(jié)磨損。
關(guān)鍵字: 微納米復(fù)合材料；陶瓷刀具；40CrNiMo；切削性能；磨粒磨損
（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
