关键词: 球形立铣刀, 淬硬钢, 切削力, 切削速度, 高速铣削

Abstract:

Using solid carbide ball end mills with TiAlN coating, the experiments of high speed milling of hardened steels were performed. Workpiece materials tested included 45 steel at 52HRC, 48HRC, 42HRC, and P20 steel at 41HRC, 33HRC, respectively. Based on flow stress equation at material formation and shear angle theory, the effects of cutting speed, workpiece hardness, material performance on cutting forces were investigated. The cutting parameters involved were: cutting speeds in the range of 156 to 816 m/min, feed rate of 0.1 mm/tooth, axial depth of cut of 3mm, and radial width of cut of 1mm. The results show that saw-tooth chips are formed during the high speed milling of hardened steels, and the influences of cutting speed, workpiece hardness on milling forces are significant. 

Key words: ball end mill, hardened steel, cutting force, cutting speed, high speed milling