Low Friction Fast Balance Unloading Fuzzy Control Precision Servo System

In the field of ultra precision machining, vertical movement component is relatively heavy, although can be balanced by the existing balance device, the resistance exercise is still large, which will cause the flow effect of drive motor, and thus affect the stability and precision of the machine tool.In the design of machine tool, therefore, how to balance out the gravity of the vertical motion components, in order to reduce the driving force after being balanced, thus meet the requirements of the velocity and acceleration, and improve the positioning accuracy, for the security of machine tool stability and precision of the stay will be of great significance. In this paper, the gravity balance system of the vertical moving parts of the ultra precision machine tool is studied, and the main contents are as follows:1. According to the working characteristic of ultra precision machine tools and other factors, select the use of pneumatic transmission to build gravity balance system of vertical motion components.Pneumatic experiments with a simple model to simulate the aerodynamic balance system in the use of ultra precision machine tools, a proposed two key technologies:without friction cylinder and seal chamber real-time precision constant pressure control.2. According to the relevant pneumatic technology of pneumatic balance system, the four aspects of low friction cylinder, pneumatic proportional servo valve, servo control system and control strategy are compared and analyzed.3. Through studying the development of low friction cylinder, combined with the gas lubrication theory, and on the basis of the basic structure of the cylinder, this paper proposes a comprehensive, full process gas friction-free rapid response of the suspension support balancing device.The device using the flexible link, in combination with conical surface and spherical washer to balance specimen’gravity, given its unique more eccentric automatic adjustment ability. The theoretical parameters of the device are analyzed, which lays a theoretical foundation for the optimization of the structural simulation parameters.4. Through the study of pneumatic servo control theory, using intelligent fuzzy PID algorithm is proposed for frictionless fast response balance device real-time precision constant pressure control of seal air cavity. In order to reduce the development cycle and cost, this paper selects a precision proportional servo valve based on intelligent fuzzy PID controller.5. According to the basic theory of pneumatic transmission and electric proportional valve excellent operating characteristics, combined with frictionless rapid response to the job requirements of the balancing device, to study and put forward a kind of intelligent fuzzy control precision servo pressure balance unloading pneumatic system, and analyzed theoretically the performance of the pneumatic system is superior.6. By studying the working principle and design method of intelligent fuzzy PID controller, and through the simulation of the pneumatic circuit’s working mechanism, to verify that the intelligent fuzzy control PID control method compared with the classical PID control superiority, It is proved that the pneumatic balance system has excellent performance in real time precise constant pressure control of the cylinder air chamber.7. To verify the correctness of the machining assembly by measuring the basic parameters of the non friction quick response balancing device.To build a gas dynamic balance system experimental platform, and with a tension sensor, a pressure sensor on the frictionless fast response balancing device of friction force and low friction fast balance unloading fuzzy control precision servo system’s response time, anti-interference ability, working stability and balance is then try a movement of resistance characteristic parameters were determined. By studying and analysising the experimental results, to validate the proposed low friction fast balance unloading fuzzy control precision servo system gives full play to the intelligent fuzzy PID algorithm with excellent performance characteristics, can very good complete the task of balancing super precision machine’s vertical motion component.