一、前言 随着钢带产量不断增加,轧制速度越来越快,对产品质量要求也提高了,这就要求压下装置能快速调节辊缝以保证钢带纵向厚差在给定范围内。液压压下由于其高精度、快速性、容易控制、轧机刚度可控以及安全可靠而得到广泛发展。它先用于冷轧,后用于热轧,最近又用于中厚板。不论钢铁或有色、单机或连轧、新建或改造轧机,采用的日渐增多。据不完全统计,到1979年为 I. Introduction With the continuous increase in strip production, rolling faster and faster, the product quality requirements also increased, which requires the press device can quickly adjust the roll gap to ensure that the longitudinal strip thickness difference within a given range . Hydraulic pressure is widely developed because of its high precision, quickness, easy control, controllable rigidity of rolling mill and safe and reliable. It is used first for cold rolling and then for hot rolling and more recently for plate. Whether steel or non-ferrous, single or continuous rolling, rolling mill construction or transformation, the use of increasing. According to incomplete statistics, by 1979