求翻译：摘要：平整轧制是生产优质薄板、确保冷轧带钢成品质量的最后一道工序,它对于提高产品质量、控制板形以及表面状态起着重要作用。 本文以涟钢平整机液压控制系统为研究对象,综合考虑液压控制系统各组成部件的动态特性的基础上,建立了该平整机液压系统的机电液一体化模型。本文介绍了平整机的工艺以及作用以及S7-400 PLC在涟钢热轧平整机系统中的应用，重点阐述了S7-400的系统组成、其控制系统的主要软件设计、系统主要功能以及其故障分析和处理。是什么意思？

Abstract: The temper rolling is the production of high quality sheet to ensure that the final steps of cold rolled strip quality of finished products, improve product quality, control panel shape and surface state plays an important role. In this paper, the ripple Gangping machine hydraulic control

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Abstract: The smooth rolling is the production high quality thin steel plate, guarantees the cold-strip steel end product quality the finish, it regarding improves the product quality, the control shape of strip as well as the surface condition is playing the vital role. This article take the ripple

Summary: flat rolling is to produce high quality sheets, ensure that the last operation of cold-rolled strip steel product quality, improve product quality, flatness and surface control plays an important role. This hydraulic control system for temper mill of lianyuan iron and steel research, compre