超高速面铣淬硬钢涂层刀具切削性能研究  

Cutting performance of coated carbide tool in ultra-high-speed face milling of hardened steel

作　　者：郭景霞[1] 崔晓斌[2] 闫艳燕[2] 

机构地区：[1]河南理工大学能源科学与工程学院,河南焦作454003 [2]河南理工大学机械与动力工程学院,河南焦作454003

出　　处：《兵器材料科学与工程》2016年第1期54-58,共5页Ordnance Material Science and Engineering

基　　金：国家自然科学基金资助项目(51505132;51205112);河南省教育厅科学技术研究重点项目(15A460005)

摘　　要：为探索超高速切削条件下涂层硬质合金刀具的切削性能,进行了超高速面铣淬硬钢实验,研究了切屑成形、切削力、刀具磨损以及表面粗糙度的特点。研究结果表明:在切削速度为2 800 m/min时,部分切屑出现了锯齿分离的现象;而在切削速度为2 000 m/min时,开始出现球状切屑;这两种切屑形态分别表征了超高速切削条件下高强度的热、机械冲击以及极高的切削温度;切削力及工件表面粗糙度均随切削速度的升高呈先下降后上升的趋势,并在切削速度为1 500m/min时达到最小值;超高速切削条件下,极高的切削温度导致刀具材料力学性能下降,刀具后刀面的主要失效机理为磨粒磨损、黏结磨损和氧化磨损。由于高强度的热、机械冲击,刀具前刀面的主要失效机理为涂层剥落。For the purpose of exploring the cutting performance of coated carbide tool in ultra-high-speed cutting,ultra-highspeed face milling experiments of hardened steel were conducted to investigate the characteristics of chip formation,cutting force,tool wear and surface roughness. The results show that at the cutting speed of 2 800 m/min,the segmented chip becomes separated,indicating that there are serious thermal and mechanical impact in the chip formation process. Sphere-like chip starts to form at the cutting speed of 2 000 m/min due to the high cutting temperature. With the increase of cutting speed,both of the cutting force and surface roughness decrease firstly and then increase. When the cutting speed is 1 500 m/min,valley values of them can be obtained. The high cutting temperature leads to the reduction of the mechanical properties of the cutting tool. The main wear mechanisms of the tool flank face are abrasion,adhesion and oxidation. For the tool rake face,the main wear mechanism is coating delamination.

关 键 词：超高速切削 面铣 涂层刀具 切屑成形 切削力 刀具磨损 表面粗糙度 

分 类 号：TG506.1[金属学及工艺—金属切削加工及机床]