半主动动力吸振镗杆系统的颤振抑制机理

深孔镗削过程中，针对影响工件加工精度和表面质量的颤振现象，建立单自由度切削颤振系统的动力学模型，利用谐波平衡法求得机床主轴转速与极限切削宽度的关系式，并绘制了机床主轴转速与极限切削宽度的稳定性图，结合半主动动力吸振镗杆刚度和阻尼系数的可控性，分析了机床结构刚度及阻尼系数大小对颤振抑制的影响。研究结果表明：机床颤振频率随着主轴转速呈分段线性变化，增大机床结构的刚度和阻尼，系统的稳定性区域在一定范围内相应的增大。为今后进行半主动动力吸振镗杆具体模型的建立和相关参数的选取提供了理论依据，具有实际意义。

Mechanism of Cutting Chatter Suppression Based on Semi-active Dynamic Vibration Absorbing Boring Bar System

In the deep-hole boring process , based on the chatter phenomenon that affected machining accu-racy and surface quality of workpiece , a single degree of freedom dynamic model of cutting chatter system was established .The relation between machine tool spindle speed and the limited cutting width was obtained by har -monic balance method and W-S figure was drawn .Combined with the controllable stiffness and damping coeffi-cient of semi-active dynamical vibration absorption boring bar , the effect of machine tool structure stiffness and damping coefficient on the flutter suppression was analyzed .Research results show that the frequency of machine tool chatter changes with spindle speed piecewise linearly .Increasing machine tool structure stiffness and damp-ing coefficient , the stability of the system area increases within a certain corresponding range .This has practical significance and provides a theoretical basis for the establishment of specific model and the selection of related parameters.