基于EXCEL的铝板带热轧规程优化设计

介绍了铝合金板带轧制压下规程的重要意义,以及轧制规程制定和优化设计的主要方法,根据铝合金热轧过程控制特点,选用恰当的轧制参数数学模型,依据轧制规程优化设计的要求,确定了目标函数数学模型和约束条件,借助于EXCEL规划求解功能进行了轧制规程的优化设计,通过计算实例对其应用效果进行了分析.     

基于罚函数法的冷连轧轧制规程优化设计

 合理的轧制规程是使轧制过程达到最佳状态的重要保证。规程设定中采用具有自学习功能的BP神经网络取代传统轧制力数学模型,选用Levenberg Marquardt算法对轧制力进行预报。采用等相对负荷目标函数,考虑到现场和设备所受限制,确定约束条件。利用罚函数法将有约束的最优问题转换成无约束的最优问题,对某厂冷连轧现场规程进行了优化设计,并对优化前后的轧制规程进行了分析和比较,优化效果令人满意,满足实际生产要求。     

用连铸坯轧制重轨的变形模拟实验

以铅为实验材料，在实验室二辊φ100mm开坯机上采用网格法模拟了以连铸方坯为坯料轧制重轨时轧件的变形规律，研究了压下规程及轧制速度对轧件在不同孔型轧制时变形等效应变分布的影响，发现等效应变分布的基本规律性，为制定合理的重轨压下规程及采用连铸坯轧制重轨提供了实验依据。     

超高强钢冷轧过程轧制力计算的改进模型

 为了解决采用圆弧模型计算超高强钢冷轧过程轧制变形区轧辊压扁曲线误差较大的问题,充分考虑到超高强钢的轧制特点,通过分析不同压扁半径下轧辊压扁曲线的变化规律,构造出新型轧辊压扁曲线函数模型,给出了该函数中轧制变形区接触弧长特性参数与轧辊压扁曲线特性参数的求解方法。基于此,根据弹塑性理论中的变形与应力关系,推导了入口弹性变形区、塑性压下变形区以及出口弹性变形区单位轧制压力分布计算过程,建立了超高强钢冷轧过程总轧制力计算模型。并将其推广应用到某钢厂2030冷连轧机组,验证了该模型的计算准确度。结果表明,超高强钢冷轧过程轧辊压扁曲线用二次函数表示,更能准确反映轧辊压扁状态,其计算结果与实际值具有较高的吻合度。同时,为冷连轧机组生产超高强钢产品极限轧制能力的评估与轧制规程的制定提供了理论依据。     

邯钢2800mm中厚板轧机优化规程研究

优化轧制规程计算及实现的基本数学模型，由优选轧制压力公式，变形抗力，温降模型参数和精确弹跳方程构成。通过计算机模拟实验比较主要压力公式的Ｑｐ值，优选出该轧机的实用压力公式，变形抗力和温降模型参数非线性估计方法，提高了压力预报精度；反映板宽因素的非线性弹跳方程，是提高辊缝设定精度的关键。通过实测轧机横向刚度的轧制方案，优化轧制规程和不同终轧道次轧制压力规程的设定计算，并在轧机上实验，证明所研制的方法     

大断面初轧坯的轧制

文章提出了大型钢坯轧制存在的问题,并依据高轧件变形的特点,从钢坯孔型设计原理出发,结合轧钢机、剪断机的能力参数,有针对性地编排轧制工艺规程,采用合理的工艺制度,从而达到稳定质量,满足生产需求的目的。     

基于工程设计的热轧宽厚板轧制规程计算系统的开发及应用

结合宽厚板轧机生产工艺特点及工程设计需要,开发了宽中厚板轧制规程计算软件,对宽厚板轧机轧制过程温度及力能参数计算模型公式的选用、计算方法及编程过程等进行了介绍。采用本软件计算的宽厚板轧制规程实例与工厂实际生产过程轧制规程进行了对比,两者计算结果比较一致。在现代宽厚板轧机工程设计中,采用该软件可获得合理准确的轧制规程,在轧机设备选型、轧机产能计算、极限规格产品轧制能力及轧机电气传动系统设计方面均具有重要的意义。     

16Mn中板轧制负荷均衡优化

针对16Mn中板轧制过程中存在的轧制负荷不均衡现象,通过模拟轧制实验得出变形抗力与变形程度、变形速度、变形温度间的关系.在此基础上,根据现场生产实际情况,建立了一套符合实际生产的轧机负荷计算模型;利用动态规划法对现场压下规程进行负荷均衡优化,编制出轧制负荷计算和优化软件并给出负荷均衡的压下规程,为16Mn中板轧制提供更合理的轧制制度.     

半连轧弹扁成品缺陷的消除

根据八钢中型材厂650机组轧制弹扁的生产实践,针对生产中出现的成品缺陷,结合弹簧钢的变形特点分析了其产生原因,并阐述了设计变形规程中应注意的要点,以及调整中需解决的关键问题。     

方坯和圆坯在菱方孔中的变形分析

 为满足钢坯连轧机在生产圆坯和方坯的需要,同时提高椭圆和圆孔型的利用率,提出“椭圆 圆 菱 方”孔型系统生产方坯的方法。通过有限元模拟分析和工业试验相结合研究了圆坯和方坯在菱方孔型中的变形规律,对比了方坯进菱孔和圆坯进菱孔轧制时的变形特点。发现圆进菱轧制时轧件的变形更加均匀,轧件的头尾尺寸超差小,菱孔的磨损更加均匀。为合理利用中间圆孔型轧制方坯工艺规程的制定提供了依据。     

钛棒线材短流程制备新技术

从钛及钛合金的熔炼、铸造特性、等离子冷床炉的工作原理等方面分析了钛棒坯进行半连续铸造的可能性,从三辊行星轧机的工作原理、材料在变形时的受力状态、钛合金的塑性变形特性等方面对铸造钛棒坯三辊行星轧制可行性进行了分析。指出,真空等离子冷床炉半连续铸造棒坯——三辊行星轧机开坯轧制是一种钛棒线材的高效率、短流程加工新技术,是今后的研究发展方向。     

Reduction mills in helical rolling

The use of helical reduction mills is considered. Their scope in terms of rolling speed and deformation is assessed. The design and application of such mills is analyzed. A refined method is proposed for determining the width of the contact surface and the energy parameters. Experimental data are presented.     

半连轧机组生产球扁钢孔型设计实践

结合球扁钢的断面特点、球扁钢轧制变形规律的分析以及多年异型钢生产实践,开发出了一套适合半连轧机组上生产球扁钢的弯腰闭式轧法孔型系统,解决了球扁钢孔型设计在半连轧线生产的技术难题;同时采用了行业内最先进的“连续式电感应加热”方法,解决了特用钢加热不均、氧化控制困难的瓶颈;生产的球扁钢产品质量水平较高,满足国家一些重点型号船舶建设的需要。     

多辊轧机在纯钛轧制中的应用

针对纯钛的变形特点和对冷轧机的基本要求，介绍了各类多辊轧机的结构、性能特点．指出六辊轧机、森吉米尔轧机和SUNDWIG四立柱式轧机是适合纯钛轧制的机型。     

Work of deformation in screw rolling

A method is proposed for determining the unit work of deformation in the broaching of blanks in two-roller screw-rolling mills. A new approach is outlined for assessing the fracture risk and the structure of continuous-cast circular billet. Methods for determining the work of deformation in different sections of the deformation zone are considered. The distribution of the work of deformation due to reduction over the whole deformation zone is determined. The influence of extension on the work of deformation is assessed for similar rolling mills at OAO Pervoural’skii Novotrubnyi Zavod and OAO Yuzhnotrubnyi Zavod.     

A 3-D Differential Method for Solving Rolling Force of PC Hot Strip Mill

 According to the character of the deformation zone on pair cross rolls, which is different from the regular 4-high mill, there are longitudinal and transverse two-way shear deformation in the deformation zone, the character of metal particles flowing velocity is more complicated than normal rolling. Comprehensive influences of normal stress and shear stress in rolling direction, width direction and thickness direction are considered. Establish the rolling force calculation model of PC hot strip mills. After the longitudinal and transverse discretization of deformation zone, the longitudinal and transverse distribution of rolling force is worked out by the differential method, then calculate total rolling force. Calculated results are verified by experimental data.     

多辊轧机轧辊热变形模型研究

本文根据多辊带材轧机辊在轧制过程中的特点，应用热弹性学理论和圆柱体热传导微分方程，分别导出了计算轧辊热变形的模型１和模型２。文中还通过一个实例介绍了应用情况。     

Horizontal continuous casting of steel

The history of horizontal casting of steel is considered. Some features of horizontal machines are noted: low height; no ingot deformation in casting; no secondary oxidation of the metal; the ability to cast small cross sections. The basic characteristics of Russian systems are described, along with operational experience. The prospects for horizontal machines in metallurgical micro mills and in the reconstruction of existing mills are discussed.     

Load Deformation Analysis of Bored Piles in Residual Weathered Formation

The current design practice of single bored piles in residual weathered formations is based mainly on stability consideration against shear failure, and pile deformation analysis is rarely carried out. However, the acceptance criteria of single piles during pile load tests during construction is based mainly on the permissible settlement criteria as specified in the specifications∕codes. In this study, a reliable method of predicting the load deformation and load distribution curves is proposed for bored piles in a residual weathered formation (Kenny Hill Formation) in Kuala Lumpur based on: (1) considerations of the weathering profiles and the engineering characteristics of this formation; (2) field performance data of fully instrumented bored pile load tests; and (3) load transfer design characteristics of the load deformation behavior. In this deformation analysis, the pile installation methods and the nonlinear behavior of the pile material are incorporated. The proposed load deformation analysis was carried out on both the instrumented and noninstrumented piles, producing good results. Therefore, this proposed method can be used to predict the load deformation characteristics of single bored piles in weathered formation during the design stage.     

PC带钢热连轧机力能参数研究之一——轧制力的计算

考虑了轧辊交叉对轧制力的影响，建立了ＰＣ热连轧机轧制力计算模型，利用能量变分法和秒流量相等原则计算出前后张力分布，并以其作为边界条件，将变形区离散后，用差分法计算出轧制力的纵横向分布，进而得出总轧制力值。计算结果与实测值吻合。