轧机液压压下控制系统的实验研究

本文通过实验研究，从理论上分析了影响轧机液压压下控制系统频带的某些因素。提出了提高频带的几种方法，包括流量补偿，双伺服阀控制，适当选取液压缸的面积，提高液压系统的供油压力，选用高频带大流量的伺服阀以及提高系统其它控制元件的频带等。介绍了一种实验装置并首次给出了大型液压缸摩擦力的测量方法和实测结果。本实验系统的频带为13（赫芝）（当输入信号为100微米（峰－峰）值时）。压下速度达4（毫米/秒）。液压缸内径1000（毫米）。

EXPERIMENTAL AND THEORETICAL STUDIES OF THE HYDRAULIC SOREWDOWN SYSTEM OF ROLLING MILLS

Some of factories which have an effect on the freguency response of the hydraulic screwdown system are studied theoretically by the experimental investigation. This paper presents methods to increase frequency band, it includs flow compensation, double servo valve control, selecting the area of hydraulic cylinder properly, increasing the supply pressure of the oil source, using the servo valve with high rated flow and wide frequency band. A experimental setup is introduced, and the measurement of friction force for a large scale hydraulic cylinder and its measured results are first presented in published literatures. When the input signal to the control system is of 100 μ (p-p), the frequency band that　may be obtained for this experimental system is 13Hz, and the screwdown velocity has reached　4mm/s. The diameter of the hydraulic cylinder is 1000mm.