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加工中心加工精度与其整机结构特性和各轴控制特性密切相关。考虑进给轴间的动态激励响应,研究加工中心整机在特定频率范围内的各向动柔度,对辅助机床设计具有重要意义。该文结合有限元建模和相关实验方法,分析了某双驱进给平台的结构动柔度,重点研究其机械系统的轴间耦合问题。提出了一种用传递函数组等效机械结构特性的整机机电联合仿真建模方法,并以此研究了某卧式加工中心机电系统的轴间耦合问题。研究结果表明:当加工中心存在某些模态振型同时影响刀具或工件在多方向的变形时,其机械系统和机电系统的轴间耦合在整机动柔度研究和控制环参数选择时必须予以考虑。
Machining center machining accuracy and structural characteristics of the machine and the axis control characteristics are closely related. Considering the dynamic excitation response of the feed axis, it is of great significance to study the dynamic flexibility of the whole machining center in the specific frequency range. In this paper, combined with the finite element modeling and related experimental methods, the dynamic flexibility of a double-driven feed platform is analyzed, and the problem of coupling between mechanical systems is studied emphatically. This paper presents an integrated modeling method of mechanical and electrical co-simulation with the equivalent mechanical structure of transfer function group, and studies the problem of coupling between the shafts in a horizontal machining center electromechanical system. The research results show that when some modal shapes exist in the machining center and affect the deformation of the tool or workpieces in multi-directions at the same time, the coupling between the mechanical system and the electromechanical system must meet the requirements of full-motion flexibility and control loop parameter selection Be considered.