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

摘要：

使用TiAlN涂层的整体硬质合金球形立铣刀，对45钢(52HRC、48HRC、42HRC)及P20钢(41HRC、33HRC)进行了高速铣削试验。基于材料变形下的流动应力方程及剪切角理论，分析了切削速度、工件硬度、材料性能对切削力的影响。试验中的切削参数如下：切削速度为156~816 m/min，每齿进给量为0.1mm，轴向切削深度为3mm，切削宽度为1mm。结果表明：高速铣削淬硬钢产生锯齿形切屑，切削速度和工件硬度对切削力有显著影响。

关键词: 球形立铣刀, 淬硬钢, 切削力, 切削速度, 高速铣削