摘要
平面并联机床的加工精度应该用平面并联机构与电主轴耦合系统的动态性能进行评价。在考虑并联杆件的弹性动力学特性和主轴动力学特性的情况下,建立了平面并联机构与电主轴耦合系统的弹性动力学模型。通过仿真得到了耦合系统的幅频特性曲线,并在此基础上对耦合系统进行了动态性能分析。结果表明,在外界激励作用下,并联杆件系统发生了较明显的变形,并且主轴在频率低于20Hz的激励干扰下振动较为剧烈,偏离预定轨迹的位移较大,达到0.01mm,导致并联机床的加工精度明显降低,大大降低了并联机器人机床的动态性能。
The machining precision of the planar parallel machine tools should be evaluated by the dynamic characteristics of the planar parallel mechanism and spindle coupling system. The elastic dynamic model of the coupling system is established in consideration of the elastic dynamic characteristics of the parallel mechanism and the dynamic characteristics of the spindle. The amplitude-frequency curves of the coupling system are obtained through MATLAB simulation, and the dynamic performance of the coupling system is analyzed based on these curves. The results show that under the action of excitations, the parallel mechanism becomes deformed obviously, and the spindle vibrates severely when the frequencies of the excitation are lower than 20Hz. The largest displacement of the spindle deviated from the desired trajectory reaches 0.01mm, which obviously results in the reduction of machining precision and dynamic performance of the parallel machine tools.
出处
《组合机床与自动化加工技术》
北大核心
2010年第7期12-16,共5页
Modular Machine Tool & Automatic Manufacturing Technique
基金
山东省自然科学基金(Y2005F22)
山东省重点学科(实验室)基金
关键词
并联机床
平面并联机构
电主轴
耦合系统
动力学分析
parallel machine tools
planar parallel mechanism
spindle
coupling system
dynamic analysis
