径向锻造油压机电液伺服控制系统建模与仿真

分析了径向锻造油压机主缸运动电液伺服控制原理;在建立电液伺服系统各元件、子系统数学模型的基础上,借助AMESim软件搭建了电液伺服系统的仿真模型;研究了反馈方式、回程压力、建压时间和加载频次对主缸运动精确性和快速性的影响。研究结果表明:与主缸位置反馈相比,伺服缸位置反馈时系统运行更加平稳;为保证系统的响应速度和主缸对伺服缸的跟随性,合理的回程压力为3~12 MPa;为保证系统的快速性、精确性及系统的经济性,尽量减少建压时间;主缸供液高压油液体积50000 mL时,伺服缸时间滞后0. 03 s,主缸对伺服缸跟随滞后0. 01 s;系统流量确定时,锻造频次增加使得锻造行程减小,控制精度降低,系统响应滞后。

Modeling and simulation on electro-hydraulic servo control system for radial forging hydraulic press

The principle of electro-hydraulic servo control of the master cylinder motion for radial forging hydraulic press was analyzed,and the simulation model of the electro-hydraulic servo system was built by software AMESim based on the mathematic models of components and sub-systems in the electro-hydraulic servo system. Then,the influences of feedback mode,return pressure,pressure buildup time and loading frequency on the accuracy and rapidity of master cylinder motion were studied. The results show that compared with the master cylinder position feedback,the system operates more smoothly under the servo cylinder position feedback,and the reasonable return pressure is 3-12 MPa to ensure the response speed of system and the following of master cylinder to the servo cylinder. In order to ensure the rapidity,accuracy and economical efficiency of the system,the pressure buildup time is minimized. When the volume of high pressure oil supplying the master cylinder is 50000 m L,the time lag of servo cylinder is 0. 03 s,and the follow lag of master cylinder to the servo cylinder is 0. 01 s. When the system flow rate is fixed,increasing the forging frequency reduces the forging stroke,and reduces the control accuracy and lags the system response.