The Research And Development Of Dual-drive Synchronous Feed Control System

With the development of modern manufacturing, numerical control equipment is developing towards high speed, high precision, high efficiency, etc. Feed system as a control object and the execution unit of CNC equipment, its system structure and control accuracy will directly affect the performance of equipment. The traditional drive way of feeding system is to use a single motor. And It is often difficult to guarantee the accuracy of the shaft driving force acting on the center of gravity of moving parts. These have a greater impact on the life and precision of equipment. The dual-drive synchronization is to take dual motor + double gearing arranged in parallel in single degree of freedom commonly to drive the workbench. This way can greatly improve the accuracy of machinery and equipment and the life of gearing. But higher requirements of dual-drive synchronization control are put forward.Based on the demand of precision dual-drive feed system with high precision and high stability, this paper expand the theoretical and experimental studies about the control system and synchronous control strategy. Through the feed system mathematical model establishment and analysis, we completed studies of the feeding system characteristics and parameters tuning. Based on that model, we studied a variety of dual-drive synchronous control strategy through system simulation and experimental verification, and designed and validated the control strategy for the dual-drive synchronous feed system based on the cross-coupled control theory.Specific studies are as follows:1) To establish the mathematical model of double drive synchronous servo feed system, Current loop, velocity loop and position loop of the servo system are analyzed. Through the design and study of mathematical models to match the system parameters, this paper elaborated the influence of various parameters on the system's overall performance.2) Dual-drive synchronized feed control strategies are proposed in this paper.Cross-coupling control strategy based on traditional PID controller and cross-coupling control strategy based on sliding mode variable structure controller are designed. Single-axis motion control strategy with non-coupling and dual-drivesynchronized feed control strategy are analyzed. Combined with servo control system needs, simulation models are established, and performance of a variety of control strategies are analyzed.3) The precision dual-drive synchronous control experiment system are designed and built. This paper described the dual-drive synchronous control experiment principle and overall program design. By designing the dual-drive synchronous bench and the precision dual-drive test bench and development and debugging control software, the integration of synchronous dual-drive test system are achieved.4) The single-axis motion control experiment, the dual-drive synchronous control experiment and the precision dual-drive experiment are carried out respectively. Through experimental data analysis and processing, combined with simulation results, dual-drive synchronous control strategies are compared. And these experiments verified the control strategy proposed in this paper.