Control Strategy of Long-chain Tilting Head Spindle for High-acceleration Starts and Stops

doi:10.3901/JME.2019.23.210

Abstract

Abstract: Tilting head spindles are long-chain mechanical spindles, which are widely used in machine tools for machining aviation parts. Due to the mechanical flexibility of the long transmission chain, the acceleration during starts and stops are usually low. Consequently, the productivity is seriously restricted because of the longtime of starts and stops. The dynamic model of mechanical transmission and its control block diagram are firstly established based on identifying the mechanical modes of a tilting head spindle. Secondly, the reasons for the limitation of the acceleration are analyzed. It is found that the control bandwidth of the tilting head spindle is restricted by the modes of the mechanical transmission, leading to the limitation of the acceleration. Finally, according to the modes of the mechanical transmission, the integrated control strategy combining the modal filter and the dual-T network notch filter are developed. The result show that the control bandwidth is improved significantly from 12 Hz to 110 Hz with the integrated control strategy. As a result, the acceleration is increased from 10 r/s² to 40 r/s², meanwhile the starting time is decreased from 7.05 s to 1.76 s.

Key words: tilting head spindle, long transmission chain, acceleration during starts and stops, starting and stopping time

CLC Number:

TG659

Lü Dun, ZHANG Tianyu, ZHENG Beibei, SAI Yunxiang, ZHAO Wanhua. Control Strategy of Long-chain Tilting Head Spindle for High-acceleration Starts and Stops[J]. Journal of Mechanical Engineering, 2019, 55(23): 210-215.

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