低中高速干式硬态车削高硬高强高耐磨淬硬钢的试验研究  

Experimental investigations in low,medium and high speeds dry hard turning of the high hardness,strength and wear resistance hardened steel

作　　者：唐林虎[1] 沈浩[2] 常青山[2] 阴俊[2] 林小军[1] Tang Linhu;Shen Hao;Chang Qingshan;Yin Jun;Lin Xiaojun(Provineial Key Laboratory of Green Cutting Teehnology and Applieation in Gansu Provinee （University） , Lanzhou Institute of Technology, Lanzhou 730050, China;College of Meehno-Eleetronie, Lanzhou Univ. of Teeh. , Lanzhou 730050, China)

机构地区：[1]兰州工业学院甘肃省高校绿色切削加工技术及其应用省级重点实验室,兰州730050 [2]兰州理工大学机电工程学院,兰州730050

出　　处：《现代制造工程》2018年第4期1-5,10,共6页Modern Manufacturing Engineering

基　　金：国家自然科学基金项目(51465028);甘肃省陇原青年创新人才扶持计划项目

摘　　要：通过使用聚晶立方氮化硼(Polycrystalline Cubic Boron Nitride,PCBN)刀具低中高速干式硬态车削高硬高强高耐磨淬硬钢Cr12Mo V(60±1HRC)的车削试验,揭示了切削速度对切削力、切削温度、表面粗糙度、已加工表面三维形貌、刀具崩刃形貌和切屑形态的影响规律。在进给量f=0.15 mm/r,切削深度ap=0.25 mm,切削速度v=50、250、450、650、850 m/min车削条件下的试验结果表明:径向力最大,主切削力次之,进给力最小;切削区最高温度在142~288℃范围内变化;切削速度v=250、650 m/min时的径向力发生突变;表面粗糙度随切削速度的增大而线性递减,v=850 m/min时已加工表面质量最好;v=250、650 m/min车削时,PCBN刀具最易发生崩刃现象;在切削速度增大的过程中,切屑宏观形态依次为:带状、松散螺旋状、粒状、细丝状、带状。The influences of the cutting speed on the three-component cutting forces, cutting temperature, surface roughness, machined surface morphology, tipping morphology of the cutting tool and chip form in low, medium and high speeds dry hard turning of the high hardness,strength and wear resistance hardened steel Crl2MoV（60 ± 1HRC） by utilizing the PCBN inserts were experimentally investigated. The experiments were carried under the feed of 0.15 mm/r, depth of cut of 0.25 mm, and cutting speeds of 50,250,450,650,850 m/min. The results showed that the radial force is higher than the main cutting force, and the feed force is lowest ,that the highest temperatures in the cutting zone vary from 142 to 288℃, and that the sudden change of the radial force does occur at the cutting speeds of 250 and 650 m/min. The surface roughness linearly decreases with the increase of the cutting speed, and the machined surface quality is the best at the cutting speed of 850 m/min. The tipping of the PCBN tool easily happens in the case of a 850 m/min cutting speed. The chip forms are the continuous chip, incompaet helix chip, granulated chip, filamentary chip and continuous chip with increments of the cutting speed.

关 键 词：高速 干式硬态 车削 淬硬钢 切削力 切削温度 表面粗糙度 

分 类 号：TG501.1[金属学及工艺—金属切削加工及机床]