进给系统机电耦合仿真建模与误差影响规律分析

Electromechanical Coupling Simulation Modeling of Feed System and Error Influence Analysis

由于各种原因引起的复杂机电耦合现象对机床进给系统的动态精度有着重要的影响。进给系统作为加工中心的重要组成部分,其动态特性会直接影响到加工中心的加工质量和效率,因此对于加工中心进给系统动态性能的要求也越来越高。为了研究进给系统机电耦合作用下的动态特性,同时对滚珠丝杠进给系统进行动力学建模与三环伺服控制系统建模,对进给系统动态响应误差影响规律进行分析。首先利用Simulink仿真工具建立进给系统的动力学仿真模型;接着在所构建的机电联合Simulink仿真模型中,综合考虑了系统三环控制参数、丝杠间隙、速度、加速度等因素对系统跟随误差的影响;最后通过所搭建的单轴伺服进给系统实验平台进行了验证,明确了速度、加速度与跟随误差的相关性。

The complex electromechanical coupling phenomenon caused by various reasons has an important influence on the dynamic accuracy of the machine tool feed system.As an important part of the machining center,the dynamic characteristics of the feed system will directly affect the machining quality and efficiency of the machining center,so the dynamic performance requirements of the machining center feed system are getting higher and higher.In order to study the dynamic characteristics of the feed system under the electromechanical coupling,the dynamic modeling of the ball screw feed system and the three-ring servo control system are modeled at the same time,and the influence law of the dynamic response error of the feed system is analyzed.Firstly,the dynamic simulation model of the feed system is established by Simulink simulation tool,and then the influence of the three-ring control parameters,lead screw clearance,speed,acceleration and other factors on the following error of the system are comprehensively considered in the constructed simulink simulation model,finally,the experimental platform of the single-axis servo feed system is used to verify the correlation between the speed,acceleration and the following error.