Abstract
Aiming at the problem that the working state of the boring bar cannot be observed in the closed environment during deep hole boring processing, this study designs a multiparameter state monitoring system for the boring bar in the cutting process. The main idea of this monitoring system is to use the piezoelectric effect of the strain gauge in the sensor to measure the change of the voltage, and to obtain the three-way cutting force, the tooltip displacement, the vibration velocity, and the vibration acceleration through the voltage. To realize the online monitoring of multiparameter state in the cutting process, the stress model of the boring bar is established, and the stress analysis is carried out. The overall structure of the online monitoring system is established, and then the various parameters obtained by voltage are analyzed and calculated. The experimental platform of multiparameter state monitoring of the boring bar is built. The monitoring results of the multiparameter state monitoring system and commercial measurement system in the cutting process are compared by boring experiments. The results show that the error of three-dimensional cutting force and vibration acceleration is within 10%, and the error of tooltip displacement fluctuates around 15%, which verifies the feasibility of the monitoring system in the boring process.