CBN滚切车刀研制及其加工质量研究

DEVELOPMENT OF TURNING TOOLS TIPPED WITH ROTATING CBN INSERT AND INVESTIGATION OF THEIR PERFORMANCE

研制了安装９．５～２３ Ｃ Ｂ Ｎ 刀片的滚切车刀。刀片用弹性卡头装卡，刀杆具有可调前角和刃倾角，并具有滑动轴承和滚动轴承 ２ 种刀轴。切削实验表明，加工质量主要受表面波纹度影响，采用适当的切削速度、进给量、刀具几何参数，减小刀片直径和刀轴轴承间隙均可降低波纹度。

Turning tools tipped with rotating CBN inserts were designed and tested. The inserts with diameters of 9.5, 12.7, 23 mm were accommodated by different collets and the tool holders were able to provide adjustable rake angle and inclination angle. The spindle of the tools was supported with either plain bearings or ball bearings. The investigation demonstrated that the surface quality of the machined parts was dominated by surface waviness which could be reduced by using appropriate cutting speed, feed rate and tool geometry. With ball bearing holders having 12.7 dia. inserts, optimum cutting conditions in terms of lowest waviness were found via numerical optimization based on the experimental data. Better machining quality could also result from tools using smaller cutting inserts and with smaller bearing clearance. The experiment also showed that the tool holders with plain bearings were more likely to generate lower waviness.