基于切削技术的金刚石刀具磨损特征分析

金刚石刀具的磨损情况决定其使用寿命。用金刚石PCD刀具切削6061-T6镁铝合金工件，通过不同切削速度、切削深度、振动频率、刀具后角时的切削力及切削温度变化，研究不同刀具前后角、进给量、切削转速时的工件表面粗糙度及刀具磨损面积。结果表明:金刚石刀具的切削力和切削温度随切削速度、切削深度的增加而增大，随振动频率的增加而减小；刀具后角增大，金刚石刀具的切削力呈先下降而后缓缓上升趋势，但对切削温度的影响很小。当刀具前角为10°，刀具后角为8°，切削速度为0.46?m/s，切削深度为28?μm，进给量为0.10?mm/r，切削转速为4100?r/min，振动频率为22?kHz，切削振幅为9?μm时，金刚石刀具的磨损面积最小，磨损程度最低，使用寿命最长，但工件的表面粗糙度稍高。 

Analysis on wear characteristics of diamond tools based on cutting technology

The wear condition of diamond tools determines its service life. The 6061-T6 magnesium-aluminum alloy workpiece was cutted with diamond PCD tool. Through the changes of cutting forces and cutting temperatures at different cutting speeds, cutting depths, vibration frequencies and tool back angles, the workpiece surface roughnesses and tool wear areas at different tool back and forth angles, feed values and speeds of revolution were studied. The results show that the cutting forces and the cutting temperatures increase with the increase of cutting speeds and cutting depths, and decrease with the increase of vibration frequencies. With the increase of the tool back angles, the cutting forces of diamond tool decrease first and then increase slowly, but it has little effect on the cutting temperatures. When the rake angle of the tool is 10°, the back angle of the tool is 8°, the cutting speed is 0.46 m/s, the cutting depth is 28 μm, the feed value is 0.10 mm/r, the speed of revolution is 4 100 r/min, the vibration frequency is 22 kHz and the cutting amplitude is 9 μm, the diamond tool has the smallest wear area, the lowest degree of wear and the longest service life, but the surface roughness of the workpiece is slightly higher.