机床切削系统摩擦颤振影响因素分析

本资料包含pdf文件1个，下载需要1积分

建立舍干摩擦的单自由度机床一刀具系统的动力学模型，列写运动方程，确定系统发生颤振的临界驱动速度，给出计算临界驱动速度的计算流程图，采用理论分析和数值仿真方法讨论驱动速度、动摩擦因数、系统阻尼比对系统颤振的影响。结果表明，发生颤振后，驱动速度对于颤振的影响较为显著，动摩擦因数主要影响颤振的平衡位置，系统阻尼比对颤振的影响较为微弱，最后给出降低颤振的几项措施。 The dynamic model for the tool system in a single-degree-of-freedom machine with dry friction is established; an equations of motion is listed; the critical drive speed upon occurrence of chatter in the system is confirmed, the flow chart to calculate the critical driving speed is presented; the impacts of driving speed, dynamic friction coefficient, system damping ratio to the system chatter is discussed by introduction of theoretical analysis and numerical simulations. The results show that upon the occurrence of chatter, the drive speed presents significant impact to the chatter; dynamic coefficient of friction affects mainly the equilibrium position of the chatter while the impact of system damping ratio is relatively weak to the chatter. Finally it gives several measures for chatter reduction.