硬质合金刀具铣削30CrNi3MoV高强度钢的切削性能研究

30CrNi3MoV高强度钢是某兵器型号专用的难加工材料。本文在分析材料铣削特性的基础上,选择了合理的铣刀盘和铣刀片的几何参数,通过刀具磨损与耐用度对比试验优选出了最佳的硬质合金刀具牌号,并给出了铣削过程中硬质合金铣刀片的典型磨破损形态。研究结果表明:添加钽、铌的硬质合金是解决30CrNi3MoV高强度钢铣削工艺理想的刀具材料,在92m/min~186m/min的铣削速度范围内,刀具耐用度可达10min~49min;由于材料切削温度高和机械冲击严重,铣刀片的磨破损形态主要表现为后刀面上狭长的热磨损带,倒棱上长方形的磨损坑,前刀面上扇形剥落和刀尖处三角形崩碎破损等。

Study on Cutting Performance of Cemented Carbide Inserts When Milling 30CrNi3MoV High-Strength Steel

CrNi3MoV high-strengthsteel is a sort of difficult-to-cut material and is specially used for certainweapon equipment. Based on the analysis of its milling characteristic, reasonablegeometric parameters of milling cutlerand insert were selected, cemented carbidegrade was also selected through contrastexperiment of tool wear resistance and tool life, and typical wear and failure form of cemented carbideinserts during the milling process were presented. It is shown from the investigation that cemented carbideadded with Ta and Nb is the proper tool material for the milling process of 30CrNi3MoV high-strengthsteel, and the cutting tool life has reached to 10～49 min within the cutting speed region of 92～186 m/min; because of the high milling temperatureand severe mechanical shock, main wear and failure form of experimental inserts can be described as narrow thermal wear zone in the rear face, rectanglecrater wear in the middle of the negative land, sectortipping in the rake face, triangle break-off in the cornerand so on.