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一、前言随着有色金属加工业的迅速发展,特别是近年来民用铝型材和宽型、大卷径的箔,带材的发展,液压技术的应用日趋广泛。挤压机,采用液压压下的高速轧机以及采用液压传动的各种辅助设备等,已在有色金属加工设备中占据了主导地位。目前,世界各国液压技术越来越向高压高速及高精度发展,因此,对液压油的要求也越来越严格。就世界各国所制造的挤压机而言主缸都选用210×10~5Pa(210bar)的压力,而且要求挤压机在自动控制或程序逻辑控制(P.L.C)系统的控制下,按严格的时间要求和精确的行程完成每一个工艺动作。高速轧机在轧制过程中,要求液压系统以几十
I. Introduction With the rapid development of non-ferrous metal processing industry, especially in recent years, civilian aluminum and wide, large diameter foil, strip development, the hydraulic technology is widely used. Extruder, using high-speed hydraulic pressure rolling mill and the use of hydraulic transmission of various auxiliary equipment, etc., has been in non-ferrous metal processing equipment occupy a dominant position. At present, hydraulic technology in various countries of the world is increasingly developing towards high-pressure high-speed and high-precision. Therefore, the requirements for hydraulic oil are also becoming more and more stringent. For the extruders manufactured in all countries in the world, the pressure of 210 × 10 ~ 5Pa (210bar) is adopted for the master cylinder, and the extruder is required to operate under the control of automatic control or program logic control (PLC) system according to strict time Requirements and precise travel to complete each process action. High-speed rolling mill in the rolling process, the hydraulic system to dozens