Optimal feedback control technology for machine tools flexible feed drive

HUANG Zhong-shi1, YU Guang-huai2, ZHANG Wei-min3
(1.Department of Mechanical Engineering, Baise Vocational College, Baise 533000, China; 2.Kunming Machine
Tool Co., Ltd., Shenji Group, Kunming 650203, China; 3.School of Mechanical
and Energy Engineering, Tongji University, Shanghai 201804, China)

Abstract: Aiming at the transmission control problem of the flexible feed drive system of the machine tool, the highspeed tracking of the ball screw driver was studied, and an optimal feedback control method with high dynamic precision was proposed. Active damping and precise tracking were achieved using feedback measurements on the load side of the feed table. At the same time, the transmission control was optimally adjusted with two weights to achieve interference suppression and active vibration reduction. In the feedback, the table flutter was suppressed by introducing modal damping, and combined with the antiresonance of the structure to suppress highfrequency interference. The results show that the method can achieve precise highspeed feed transmission control at a lower cost. The maximum error at high acceleration is ±40 μm and a tracking bandwidth greater than 300 Hz is obtained. The optimal control effect is better at low frequency and high frequency, and the interference suppression ability is strong, and the interference attenuation performance greater than 5 times which can be achieved at about 157 Hz.
Key words: feed drive; flexible control; feedback control; damping; ball screw drive