Optimization Design And Motion Control Of The Fast Axis Servo System

The Fast-Axis servo device(FASD)is a high dynamic machining equipment which can realize high frequency in long stroke.The FASD is able to realize the turning of some high-gradient components,and improve the machining efficiency of freeform surface.At present,developed countries have been matured in the research and commercial product of the ultra-precision FASD,but the technology is complicated and the system is expensive.In recent years,China has also carried out research on key technologies of FASD,which has achieved certain results in device design,motion control and processing technology,while has not been well applied due to the high technical complexity.Based on the research at home and abroad,this paper proposes a FASD with linear guide transmission,and studies the difference of performances from that of FASD with static guide transmission,and obtains the key indexes of traditional FASD through optimization design and reasonable control.This paper is mainly composed of the following contents:1.The design of FASD for linear guide transmission is carried out and the corresponding design indexe is put forward.The linear rolling guide is used to improve the rigidity and response frequency of the system.The structure is optimized and the physical prototype is developed.2.The dynamic model of the FASD is established,and the model parameters of the system is identified through the open-loop identification experiment.meanwhile a 2-dof controller with feedforward and feedback is designed.The high precision motion control of the FAS device is realized by adjusting the parameters of the control system.According to the test,the tracking accuracy of the linear rolling guide transmission FASD reachesd ±1?m when moving at the sinusoidal trajectory at the frequency of 20 Hz and the stroke of 5mm.3.The anti-interference ability of the system and the influence law on the system under the servo state is studied,and the closed-loop transfer function of the FASD is obtained.The tracking error source of the linear rolling guided-type FAS system is investigated,and the servo capability of the system is validated.The vibration effect of the FASD on the lathe is tested,which provides the basis for constructing the FAS turning system...