CAJ | 학술논문

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1200 m 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600 m 时表面粗糙度达到最大值1.7μm。
침대각향동성열해석묵절삭과정중도구마손과쾌적문제，채용취정금강석(PCD)도구진행료절삭가공시험。연구료절삭과정중 PCD 도구적마손형식、마손규률이급도구마손대표면가공질량적영향。시험결과표명：PCD 도구마손주요발생재후도면상，마손형식위마립마손화양화마손。마손구역가이분위평행구조화엄중마손량충형모。초시마손계단，마손대장도급극증대，병재절삭1200 m 후진입정상마손계단。절삭과정중환출현료석묵절설재마손구역적점부퇴적화도구붕인현상。절삭초기，수착절삭거리적증대，가공표면조조도치급극증대，절삭거리위600 m 시표면조조도체도최대치1.7μm。
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 experi-mental 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 1200 m,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 1.7 μm when the cutting distance is of 600 m.