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为了研究高速滚珠丝杠进给系统的动态特性,提出一种改进的集中质量建模方法,该方法考虑了滚珠丝杠进给系统基座的质量、柔性及进给系统部件间反向间隙对系统动态特性的影响,并完善了滚珠丝杠进给系统集中质量模型等效参数的计算方法。以MAG某加工中心X轴滚珠丝杠进给系统为实验对象,对该集中质量模型建模方法进行实验验证,仿真结果与实测结果具有相同数量的特征频率,且特征频率的误差在5%以内。滚珠丝杠进给系统的仿真分析表明,螺母位置改变引起的进给系统固有频率变化将影响伺服系统的稳定性,滚珠丝杠进给系统中的反向间隙会激励部件产生高频振动,给进给系统带来不利影响。
In order to study the dynamic characteristics of high-speed ball screw feed system, an improved method of central mass modeling is proposed. The method takes into account the quality and flexibility of the base of ball screw feed system and the pair of backlash between feed system components System dynamic characteristics, and improve the ball screw feed system to focus on the quality of the equivalent model of the calculation method. Taking the X-axis ball screw feed system of a certain machining center in MAG as an experimental object, the method for modeling the mass-quality model is validated. The simulation results have the same number of eigenfrequencies as the measured results and the error of the characteristic frequency is within 5% . The simulation analysis of the ball screw feed system shows that the change of the natural frequency of the feed system caused by the change of the nut position will affect the stability of the servo system. The backlash in the ball screw feed system will stimulate the parts to generate high-frequency vibration Feed system adversely affected.