Key Technologies Of The Two-Point Servo Crank Press Based On Embedded Control

As a result of driving flywheel and clutch by a general motor, it is difficult to achieve variablespeed drive for the traditional press. It can only provide fixed motion characteristic and poor processadaptability, which can hardly satisfy the future production development. The Servo press, which isbased on the traditional press, abandoning the flywheel and clutch devices, uses a direct driving servomotor to achieve a flexible control of slider movement, and meets the demand for different processingtechnologies. In this paper, the two-point servo crank press is studied. The main contents areorganized as follows:First, the development status of the servo press and its CNC technology were introduced. Theworking principle, performance indicators and process models of the servo press were analyzed.Based on the need of design, the overall design framework of the servo press with the structure of thetwo-point servo crank press was presented, including the selection of its transmission, driving deviceand control system solutions completed. The kinematics and dynamics analysis of the two-point servopress were also analyzed, which provided a theoretical basis to realize intelligent control of the servopress.Second, the control methods of the dual-motor synchronization were designed for the applicationof the method of a dual-motor driving. At first, a mathematical model of the selected type servo motorwas built. As a conventional PID controller cannot meet the requirements of the control of complexsystems with hysteresis characteristics, a fuzzy PID control strategy was used in a single-point servocontrol system. As a sequence, it was found that the fuzzy PID was better than the conventional PID.Comparing with several synchronous control strategies, the cross-coupled method was employed asthe final control strategy. Since the servo press was easy to generate mechanical shock, vibration, etc,when speed changed dramatically, an S-curve acceleration and deceleration planning algorithm wasadopted.Third, according to the control requirements of the servo press, an ARM+FPGA embeddedcontroller was used in a servo press control system. The work to select the core board and design theFPGA-based expansion board was accomplished. Within the embedded controller, while the ARM9core board was responsible for the system control tasks processing, the FPGA expansion board didwith the servo motor driving and signal reception work. Finally, a real-time embedded control system for the servo press was established, thecustomization and porting embedded Linux operating system including BootLoader, kernel and rootfile system was also designed. The Xenomai module was used to improve its real-time performance.On this basis, function division of the embedded servo press control system was carried out and thedesign of servo control module, communication module and interactive system were illustrated indetail. At last, the system experiments were conducted and the servo motor speed curves of theimprint process and the fast-slow-fast process modes were monitored by servo configuration software.