&nbsp;Monitoring of the milling force based on the current signals of spindle drive motors

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (1) : 259-264.

Monitoring of the milling force based on the current signals of spindle drive motors

WANG Zhiyong , DU Weitao

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Abstract

In view of the technical problems of poor stability, low machining accuracy, marks on the tooth surfaces of workpieces and others, and focusing attention on a high speed dry cutting CNC spiral bevel gear milling machines the machine was thoroughly investigated. The study shows that the milling force is the important characterization of the tool running states and machining quality parameters. An indirect scheme was put forward, based on the actual working conditions of national high speed dry cutting CNC spiral bevel gear cutting machines. In the scheme, the milling force was reflected by monitoring the motor currents of the tool spindle and workpiece spindle. The spindle system of the machine tool was analyzed, aiming at building a model to express the relation between the tool spindle motor current and the milling force. The tool spindle system kinematic model was established, the motor current was monitored by using the double spindle’s torque measurement method, and then a time-frequency analysis was carried out on the current signals. Some mathematical methods were applied to process the data. All the measures were quoted to realize a final purpose, that is to calibrate the undefined parameters of the kinematic model of the cutting spindle system and accomplish the model for the tool spindle motor current and the milling force. The milling force can be monitored by this model in real-time. The results can provide data support for the optimum design of machine tool structures and the improvement of technological parameters.

Key words

spindle motor current / milling force / signal processing / wavelet analysis / online monitoring

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WANG Zhiyong,DU Weitao . Monitoring of the milling force based on the current signals of spindle drive motors[J]. Journal of Vibration and Shock, 2018, 37(1): 259-264

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