VC轧辊过盈力及过盈量的计算及影响分析

支撑辊液压胀形作为VC轧机独有的辊型调控手段,是控制负载辊缝与板形质量最有效的方法之一。同时,因为VC辊液压胀形作用的存在,过盈力和过盈量的定量计算成为VC轧辊设计和校核的关键。为此,首先通过分析VC轧辊套筒和芯轴热装之后的受力与变形情况,提出了原始过盈量和原始过盈力的计算方法。然后,考虑VC轧辊套筒和芯轴受力对轧辊挠度的影响,根据套筒和芯轴在轧制过程中的变形几何关系,确定了VC轧辊套筒和芯轴的变形协调方程,并结合轧制过程中力平衡与力矩平衡方程,建立了VC轧辊实际过盈力和实际过盈量分布的计算模型。最后,利用国内某VC轧机的轧辊结构参数和实际生产过程中的典型规格带钢工艺参数,定量计算并分析了带钢轧制过程中过盈力和过盈量的分布。进一步在极限油压50 MPa范围内选取9.8、19.6、29.4、39.2、49.0 MPa 5种油压,计算并分析了不同油压对过盈力分布的影响。结果表明,过盈力和过盈量分布的主要影响因素是轧制力和油压,且油压对过盈力和过盈量的影响大于轧制力的影响;油压的升高有效降低了过盈力,且油压的变化对距离油腔边部越近的部位影响越大,反之则影响越小。VC轧辊过盈力及过盈量计算模型...     

液压胀形轧辊性能的静载实验研究

超导电机对瞬态稳定性的影响是由于其两个特点而产生的。低电抗产生妆始（稳态）运行角和更高的最大转矩，长的瞬态和次瞬态时间常数使“使瞬态电抗后的电势”持续的时间长，使高的最大转矩在保持同步运行上更加有效。     

液压胀形轧辊油槽深度的确定

对液压胀形轧辊（即国外的ＶＣ轧辊）辊套热装后的弹性变形进行了有限元分析，给出了确定油槽最小深度的计算公式。本文的有限元计算结果与实验结果吻合，某些结论可为液压胀形轧辊的结构设计提供理论依据。     

浅析轧辊热凸度与轧辊冷却水的关系

轧辊热凸度与轧辊冷却水系统有着密切的关系。充分了解轧辊热凸度在轧制过程的变化，可以及时掌握轧辊冷却水系统的工作情况，从而对其进行调节，为板形控制打下良好的基础。     

可变凸度轧辊（VC辊）结构参数分析

以窄带钢轧机（Ｌ≤５００ｍｍ）为对象，通过对各种结构参数ＶＣ辊的计算，重点研究了ＶＣ辊各结构参数对其凸度生成和应力分布的影响规律，提出各参数选择的一般原则，为ＶＣ辊的设计和研制提供了理论基础与必要的资料。     

可变凸度轧辊（VC辊）在不同油压下的应力和变形分析

针对可变凸度轧辊(简称VC辊)在不同油压下的凸度变化行为及应力分布规律,进行了深入的理论计算研究,为VC辊补偿辊系变形的可行性提供了理论依据。     

轧辊凸度及直径对热轧带钢凸度的影响

为建立高精度的热轧带钢凸度计算数学模型，采用影响函数法开发了带钢凸度影响率计算软件，研究了轧辊凸度及轧辊直径对热轧带钢凸度的影响规律，得出了四辊轧机轧辊凸度影响率基本值的5次多项式拟合系数及工作辊凸度影响率的修正指数，建立了轧辊凸度影响率计算数学模型，为优化板形控制模型参数提供了理论依据。     

热连轧高速钢轧辊对产品表面质量和板形控制的影响

基于首钢京唐公司1580热连轧生产线高速钢轧辊的实际使用现状,对高速钢轧辊在降低辊耗成本和提高产品表面质量方面的优势及使用特点进行了分析,并从原理上对高速钢轧辊对带钢板形控制的不利影响进行了研究.在此基础上,提出了抑制高速钢轧辊辊面氧化膜剥落和高速钢轧辊重复上机初始辊形预报等措施,使高速钢轧辊辊面氧化膜剥落发生率显著降...     

冷连轧机SmartCrown轧辊磨损辊形对板形调控能力影响

针对宽带钢冷连轧机首次应用的SmartCrown板形控制技术,通过对SmartCrown轧辊大量实测得到了轧辊磨损辊形,采用遗传算法建立了轧辊磨损预报模型,并利用ANSYS软件建立了三维辊系有限元分析模型,研究了磨损辊形对SmartCrown板形控制技术在服役过程中板形调控能力的影响,提出了新辊形使用工艺策略．     

单机平整机轧辊的磨损及其对板形的影响

分析了单机架平整机轧辊的实际辊形、磨损状况,并通过运用有限元模型计算辊缝曲线的2次和4次分量研究了辊形对板形的影响.结果表明,工作辊磨损较轻,对辊形影响不大,但原始辊形与目标辊形差别较大,是产生1/4浪板形缺陷的因素之一;支持辊局部磨损较严重,但这种不均匀磨损对板形影响较小,在整个服役期内对板形的作用基本不变.     

Mechanical Analysis of Dead Load Crown and Structure Parameter of Hydraulic Elastic Bulging Roll

ListofSymbol　　E———Elasticmodulusofrollsleeve ;　　d———Diameterofrollmandrel;　　l———Lengthofbulgingrollsleeveoroilgroove ;　　ns———Safetyfactorofmaterial;　　p———Hydraulicpressureinrollsleeve ;　　r1 ———Innerradiusofrollsleeve ;　　r2 ———Outerradiusofrollsleeve ;　　ymax———Maximumbulgingofrollsleeve ;　　σs———Yieldstrengthofrollsleeve ;　　μ———Poisson′scoefficientofrollsleeve ;　　Δ———Thicknessofrollsleeve ;　　Δmin———Minimumthicknessofrollsleeve …     

浅析建筑装修施工质量管理

建筑装修即人们利用装饰装修材料或饰物,对建筑物内外表面及空间进行各种处理,以提高建筑物的使用舒适性。在建筑装修中,工程质量的好坏是直接关系到企业的信誉、工程的装饰效果和使用功能。因此,建筑装修施工过程中如何采取科学合理的监督管理措施以确保装修工程的施工质量显得特别重要。     

Relationship between Thermodynamic Parameters for Mn-Fe Melt and Temperature

The carbon solubility in Mn Fe melts were measured at 1 350℃ , 1 375℃, 1 425℃and 1 450℃, and accordingly the calculated equations were obtained. By thermodynamic derivation and calculation, some relationships between thermodynamic parameters for Mn-Fe melt and temperature were obtained.     

关于静载荷检测与实际沉降量关系问题的探讨

针对某建筑物沉降量较大的问题,通过分析工程地质勘察报告资料、工程的静载荷及低应变检测数据,对静载荷检测与实际沉降量的关系问题进行了探讨,对上海某些地区选择有软弱下卧层的浅部粉砂层为持力层时,静载荷试桩能否为设计提供可靠沉降数据的问题进行了思考,并提出建议.     

Relationship between Construction Firm Strategies and Innovation Outcomes

Survey results provide a preliminary assessment of the relative contribution of a range of tactical business strategies to innovation performance by firms in the Australian construction industry. Over 1,300 firms were surveyed in 2004, resulting in a response rate of 29%. Respondents were classified as high, medium or low innovators according to an innovation index based on the novelty and impact of their innovations and their adoption of listed technological and organizational advances. The relative significance of 23 business strategies concerning (1) employees; (2) marketing; (3) technology; (4) knowledge; and (5) relationships was examined by determining the extent to which they distinguished high innovators from low innovators. The individual business strategies that most strongly distinguished high innovators were (1) investing in R&D; (2) participating in partnering and alliances on projects; (3) ensuring project learnings are transferred into continuous business processes; (4) monitoring international best practice; and (5) recruiting new graduates. Of the five types of strategies assessed, marketing strategies were the least significant in supporting innovation. The results provide practical guidance to managers in project-based industries wishing to improve their innovation performance.     

Qualitative Analysis of Relationship between Refractive Index and Atomic Parameters of Solid Materials

The refractive index is one of the important parameters describing the optical properties of solid materials. However, it is difficult to obtain a quantitative relation between the refractive index and the structure and composition of materials. A qualitative relation between the refractive index and some atomic parameters of materials was proposed and demonstrated by some oxide optical crystals. A parameter P = r^-/F=r^-/( r^ ΔxD ) is defined, in which Δx is the difference of the electronegativities between cations and anions in the materials and r^ and r^- are the radii of cations and anions respectively. On the other hand, the factor D was introduced to describe the effect of mass difference of the ions. It is demonstrated by both theoretical discussion and experimental data that refractive index is a decreasing function of parameter P. The relation may be useful for the investigation of optical materials.     

Bond Stress–Slip Relationship between FRP Sheet and Concrete under Cyclic Load

Fifty-four bond specimens were subjected to cyclic bond tests to obtain the bond stress–slip relationships between the fiber reinforced polymer (FRP) sheets and concrete. The specimens were prepared in accordance with Japan Concrete Institute recommendations (in 1998). The tests were conducted using three experimental variables: (1) type of FRP (aramid, carbon, and polyacetal); (2) sheet layers (single layered and double layered); and (3) loading hysteresis. The bond stress–slip model was developed on a Popovics base envelope and consisted of seven empirical parameters: The maximum bond stress τmax, the corresponding slip smax, the curve characteristic constant a, the unloading stiffness K, the ultimate slip su, the friction stress τfp, and negative friction stress τfn. Numerical analyses using the model compared well overall to the experimental cyclic responses of the specimens.     

Relationship between Changes in Material Technology and Construction Productivity

There have been substantial changes in both material technology and construction productivity over the past several decades. By analyzing the changes in both material technology and productivity among 100 construction activities from 1977 to 2004, this research examines the strength and types of relationships that exist within these two occurrences. Through analysis of variance (ANOVA) and regression analyses, the researchers found that activities experiencing significant changes in material technology have also experienced substantially greater long-term improvements in both their labor and partial factor productivity. The research did find that a stronger relationship exists between changes in material technology and partial factor productivity than in labor productivity. The research also found that changes in the unit weight of materials had a significant relationship to labor productivity, while changes in installation and modularity had a significant relationship to partial factor productivity. The research findings will help industry practitioners to better understand how they may leverage technology to improve construction productivity, while also helping researchers understand the theoretical relationships between technology and construction productivity.     

Relationship between Governance Structure and Financial Performance in Construction

Although corporate governance has emerged as an issue of considerable importance in shaping the organizational structure and the vision of the firm, this entity has yet to receive sufficient scrutiny in the construction industry. The purpose of this study is to determine the extent by which the configuration of corporate governance may impact on the financial performance of construction firms. The investigation utilizes 100 companies of differing sizes. The analysis reveals that a critical mass of outside independent directors and the dissociation of the roles of CEO and Chairmanship of the board do translate into superior financial market returns for the firms. Other corporate governance variables have no apparent impact on the financial performance of the firms. These findings are significant to construction firms that are already established or in the process of being formed.     

高校与社会主义新农村建设的关系研究

研究了高校与社会主义新农村建设的基本关系,研究表明:新农村建设的目标和高校的基本职能之间存在有效对接的可能,高校应探索建立长效机制,从建立服务新农村考核机制、科技支撑机制和新农村建设示范点(区)的角度为新农村建设提供有力支撑.