热连轧机组活套张力力矩的精确计算

活套是热连轧机组的关键设备之一,它是匹配上下游机架速度和张力控制的重要手段,其中张力力矩是估算张力大小的重要参量。本文从力学原理出发,对活套张力力矩的计算公式进行了新的推导。公式表明,力矩长度与活套辊直径无关,与传统公式存在本质区别。结合某热轧机组的实际数据,对该公式进行了比较分析,验证了公式的正确性。

薄带热连轧液压活套控制技术的改进

通过对活套装置控制过程的分析,结合对热连轧液压活套系统的高度位置和力矩控制双输入、双输出耦合系统控制方法的研究,提出了薄规格、硅钢带钢的尾部活套力矩控制一定要优先于高度位置控制的思想。通过应用自适应、分段控制等技术,解决了实际生产中工艺、设备变化对活套控制的影响,保证了连轧过程中带钢不虚套、不跑偏。该控制方法已在实际的热轧现场得到了应用,并取得了较好的控制效果。

Q460C 20mm厚带钢在1780mm卷取机成功卷取的原理

本文分析了当前1780mm热连轧卷取工艺参数设定数学模型计算原理,通过理论推算给出了改进建议。根据实际生产中卷取机卷其它高强板的弯曲力矩设定和张力力矩设定以及卷取机主要设备,主电机能力的设定值,进行精确计算超厚规格卷取机卷取能力的影响情况,结合在给定卷取温度下钢种Q460C、20mm厚度、1440mm宽度的模拟情况,给出了相对应的最佳参数设定值,为生产高质量的超厚规格的热轧板卷产品提供了必要保证。

带钢热连轧机卷取机的卷筒传动

本文列出了国内一些热连轧机地下卷取机卷筒传动的一些参数，并作了一些比较，对卷取力矩的计算、张力控制系统及功能的分担作了说明。

Determination of initial cable force of cantilever casting concrete arch bridge using stress balance and influence matrix methods

Cantilever casting concrete arch bridge using form traveller has a broad application prospect.However,it is difficult to obtain reasonable initial cable force in construction stage.In this study,stress balance and influence matrix methods were developed to determine the initial cable force of cantilever casting concrete arch bridge.The stress balance equation and influence matrix of arch rib critical section were established,and the buckle cable force range was determined by the allowable stress of arch rib critical section.Then a group of buckle cable forces were selected and substituted into the stress balance equation,and the reasonable initial buckle cable force was determined through iteration.Based on the principle of force balance,the initial anchor cable force was determined.In an engineering application example,it is shown that the stress balance and influence matrix methods for the determination of initial cable force are feasible and reliable.The initial cable forces of arch rib segments only need to be adjusted once in the corresponding construction process,which improves the working efficiency and reduces the construction risk.It is found that the methods have great advantages for determining initial cable force in cantilever casting construction process of concrete arch bridge.

Forced Axial and Torsional Vibrations of a Shaft Line Using the Transfer Matrix Method Related to Solution Coefficients

This present paper deals with a mathematical description of linear axial and torsional vibrations. The normal and tangential stress tensor components produced by axial-torsional deformations and vibrations in the propeller and intermediate shafts, under the influence of propeller-induced static and variable hydrodynamic excitations are also studied. The transfer matrix method related to the constant coefficients of differential equation solutions is used. The advantage of the latter as compared with a well-known method of transfer matrix associated with state vector is the possibility of reducing the number of multiplied matrices when adjacent shaft segments have the same material properties and diameters. The results show that there is no risk of buckling and confirm that the strength of the shaft line depends on the value of the static tangential stresses which is the most important component of the stress tensor.

河钢邯钢热轧活套起套过程优化

邯钢2 250mm热轧精轧机组采用＂软接触控制＋常规控制＂的方式调节活套起套过程。在轧制管线钢、高强钢等产品时,经常出现带钢长时间失张、带钢头部拉窄、活套角度严重超调等问题,为此,详细分析了活套生产工艺和控制原理,结合生产实际,提出了通过调节活套张力力矩斜坡输入斜率来优化活套起套过程的控制策略,并通过编写PLC程序和上位机界面予以实施。该系统投入运行后,带钢头部尺寸命中率提升至96.9%,活套角度波动范围缩小到±2°之内。

热连轧液压活套控制技术研究与应用

本文通过对活套装置控制过程的分析，结合对热连轧液压活套系统的高度位置和张力力矩控制双输入双输出耦合系统的控制方法研究结果，提出了薄规格、硅钢带钢尾部活套力矩控制一定要优先于高度位置控制的思想。通过应用自适应、分段控制等技术，解决了生产实际中工艺、设备变化对活套控制的影响，保证了连轧过程中带钢不虚套、不跑偏。该控制方法已在实际的热轧现场得到了应用，并取得了较好的控制效果，在同类行业中具有很好的推广价值。