关键词: 高速、高精度, 进给系统, 机械刚度, 辨识

Abstract:

As mechanical stiffness is an important parameter and has a great influence on dynamic performance of high-speed & high-precision machine tools. This paper proposed a novel method that servo mechanical stiffness can be identified under closed-loop conditions for machine tools in which popular commercial computer numerical control (CNC) system was employed. Based on 2 order control system for feeding mechanical system of worktable,an identification model for mechanical stiffness was obtained, and continuous and effective stimulation was achieved by inputting programmed displacement commands which were described as a multi-segment quadratic curve to CNC system. To verify validity of the proposed method, the simulations and experiments were performed, results show that the method is convenient, effective and suitable for commercial CNC system even closed-architecture system under industrial conditions.

Key words: high-speed and high precision, feeding system, mechanical stiffness;identification