Study On Modeling And Simulation Of The Driving System For A Power Servo Turret

High-grade NC machine tools are modern machine tools with high-tech. Their performance and quality are an important symbol to measure the level of a national industrial modernization and comprehensive national strength. The power servo turret is one of the most important function components in NC machine tools, its performance and quality directly affects the cutting performance and the cutting efficiency. And it can also affect the performance, accuracy and reliability of the host. The flute disc locking and the dynamic characteristics of the hydraulic system have an important influence on the performance of a turret. Thereby it is necessary to analyze them.This paper analyzes the working principle and working process of a power servo turret. On the basis of it, first through buildng experimental platform, selecting transducers and data acquisition card, fluid pressure of the front and rear cavities in the turret main piston, the location, speed and torque of the servo motor are detected during the process of the flute locking. The noise signal in the exprimental data is filterred with the smooth filtering method. The reason for the change of the pressure and the influence on the motor position, speed and torque during the process of the flute disc locking are analyzed. The statistic laws are derived for the maximum pressure jumping in the front and rear cavities and the rotation angle of the flute disc meshing. The positioning accuracy of the turret is cauclated. The design inadequacies are found and a technical scheme is proposed to improve the performance of the power turret. Then the gear transmission system is simplified reasonably. On the basis of the equation of the piston motion, the rotation equation of moving flute disc and the motion equation of the gear train, the dynamic model of the turret driving system is established. By using the experimental data, the parameters of the model are identified by least squares method. Then, the angular velocity of the flute disc, the velocity of the main piston and the frictional force during the process of the flute locking are obtained. Finally, the dynamic model of the hydraulic system is established by using the state space method. The dynamic simulation of the hydraulic system is conducted by a programe developped in the Microsoft Visual C++environment. The relation between the dynamic characteristics of the hydraulic system and the main performance parameters is investigated. These efforts have an important guiding significance to increase the quality and performance of the turret and to improve the performance of follow-up products.