论文部分内容阅读
机械加工过程中刀具的切削颤振是影响加工质量和加工精度的关键因素。为了提高孔的加工质量,设计出一种新型抗振镗杆——约束阻尼型镗杆,该镗杆由镗刀头、基体层、阻尼层和约束层组成。针对约束阻尼型减振镗杆,首先从切削稳定性角度分析,增大镗杆的固有频率、静刚度及阻尼比,能有效提高镗杆的减振性能;其次利用ANSYS有限元分析软件得到各材料层厚度参数对镗杆减振性能的影响因子大小;随后对各参数进行优化分析获得优化的减振镗杆,优化减振镗杆的固有频率和阻尼比均大于普通镗杆,且相同激励下减小振幅可达34%;最后通过实际切削实验检验所设计镗杆的抗振性能,在相同切削条件及刀具悬伸长径比(L/D=6)下,优化减振镗杆所得到的表面粗糙度值较普通镗杆降低50%以上,由此说明约束阻尼型减振镗杆具有更好的抗振性能。
Cutting chatter during machining is the key factor that affects the machining quality and machining accuracy. In order to improve the processing quality of the hole, a new type of anti-vibration boring bar-constraining damping boring bar is designed. The boring bar consists of the boring head, the base layer, the damping layer and the constraining layer. According to the damping stability of the damping boring bar, from the cutting stability point of view, increasing the natural frequency of the boring bar, static stiffness and damping ratio, can effectively improve the damping performance of the boring bar; followed by ANSYS finite element analysis software Material layer thickness parameters on the damping performance of the boring bar factor size; then optimize the parameters to obtain the optimal vibration damping boring bar, the optimization of vibration damping boring bar natural frequency and damping ratio are greater than ordinary boring bar, and the same excitation The amplitude of vibration can be reduced by 34%. Finally, the anti-vibration performance of the designed boring bar is tested by the actual cutting experiment. Under the same cutting conditions and tool overhang length-diameter ratio (L / D = 6) The obtained surface roughness value is lower than ordinary boring bar by more than 50%, which shows that the constrained damping type boring bar has better anti-vibration performance.