拉坯矫直机

1.前言 拉坯矫直机是弧形连铸机上的重要设备之一。它的作用是拉坯并将铸坯矫直。此外,在浇注前,拉坯矫直机还要把引锭杆送到结晶器内。浇注开始后,当铸坯被拉至切割机处时,再把引锭杆脱掉。通常对拉坯矫直机的要求为:具有足够的拉坯力及矫直力;上拉辊开口度应设计成可以     

弧形小方坯连铸机用拉矫机

本文介绍各种弧形小方坯连铸机用拉矫机，包括挠性引锭杆和刚性引锭杆的拉矫机，并分析了各种拉矫机的结构特点和优缺点。     

小方坯连铸机引锭子杆自动跟踪系统改进

研究了小方坯连铸机引锭杆自动跟踪系统,介绍了引锭杆自动跟踪系统的改进方案,用比较简单的方法,避免了事故的重复发生。     

马钢大圆坯连铸机引锭杆下滑现象的研究与控制

结合马钢特钢公司大圆坯连铸机生产中多次发生刚开浇时引锭杆突然下滑的现象,综合研究了导致引锭杆下滑的各种可能因素,并从增加设备精度、设备进行预防性维护、操作标准化,设备动作过程优化等方面采取了相应的应对措施,有效地降低了大圆坯连铸机发生开浇引锭杆下滑的几率,减少了开浇漏钢损失。     

小方坯连铸机刚性引锭杆弹性分析

通过计算刚性引锭杆在静置和工作时的弹性变形量,分析了小方坯连铸机刚性引锭杆的弹性变形在使用中不可忽略,不能以此为依据进行对弧工作,并进一步提出了使用中的改进措施。     

R5．25m罗可普小方坯连铸机刚性引锭杆的改造

分析R5 .2 5m罗可普小方坯连铸机刚性引锭杆的变形原因 ,并通过将引锭杆改成焊接式框架结构 ,解决引锭杆易变形的缺点 ,并达到提高使用寿命 ,降低费用 ,缩短制造周期的目的     

主流大方圆坯连铸机的设备结构研究

介绍了大方圆坯连铸机主体设备的特点,对连铸机同一关键设备不同结构形式的结构特点、适用工况进行了比较,如结晶器、振动装置、支承导向段、拉矫机、引锭杆等.对大方圆坯连铸机中的离线对弧、在线对弧、拉矫机的控制及吊装、引锭杆的蠕动等问题进行了深入分析,提出了设计和生产中的注意事项和解决方案,为大方圆坯连铸机的设计及维护提供参考.     

铸坯引锭装置

1.铸坯引锭装置的作用 连铸设备中,引锭装置包括引锭、脱锭装置、引锭存放装置和引锭跟踪装置。铸坯引锭装置虽然不影响铸坯质量和浇注速度,但它是构成连铸设备的一个重要组成部分,直接影响着连铸机的作业率。 引锭装置的作用是:在开浇前将引锭上端的引锭头伸入结晶器内,作为结晶器的“活底”把结晶器的下口堵住,并用石棉绳塞好间隙;开浇后,随着钢水的凝固,铸坯端     

舞钢1900mm板坯连铸机滞坯事故的预防

针对板坯连铸机滞坯事故,对连铸系统的拉矫机、结晶器、引锭杆等设备进行了一系列改造,制定了连铸机滞坯事故的预防和应对措施,效果显著。     

R6m达涅利小方坯连铸机的改造

为调整产品结构,增强生产合金钢的能力,石横特殊钢厂将Ｒ６ｍ达涅利链式引锭杆三机三流小方坯连铸机改造为Ｒ８ｍ拉矫机两点矫直的连铸机,并将振动装置由凸轮杠杆式改为板簧式短臂四连杆振动机构,采用了二冷室活动导板和汽－水喷嘴冷却方式,改引锭杆存放形式为下藏式,从而适应了高效率生产高质量铸坯的要求。     

中小型镍制设备与管道的焊接缺陷及对策研究

结合近年来现场试验与施工实践，分析研究了中小型镍材（工业纯镍）设备与管道的特点、性能、焊接缺陷与产生原因，以及防止与消除其缺陷、优化制造施焊质量的工艺措施，并总结了若干条注意事项。     

风机振动和轴承温度过高原因分析及对策

对风机振动、轴承温度过高原因进行了综合分析,从设备、工艺和维护几方面分析了可能导致风机振动和轴承温度过高的因素,提出多种措施。改善了风机作业状况、工作环境,有效的解决了风机振动和轴承温度过高问题,延长了风机使用寿命。     

Satisfactions and interests.

The problem of defining satisfaction and the difficulties in distinguishing interests and satisfactions are indicated. "Aside from the final, consummatory activity, satisfaction cannot be identified in terms of activities, as can interests… . Because opinion items are not as stable as interest items, it is doubtful that they can be as useful as interest items in predicting future behavior." 5 characteristics of interests are that they: are acquired, are persistent, vary in intensity, function in acceptance-rejection behavior, are indicated in readiness to act. "Interest tests are diagnostic because no two persons have acquired the same lists of activities nor are the activities classified in the same manner as liked or disliked. Moreover, people engaged in an occupation have to a marked degree similar interests, and so people in one occupation can be differentiated from members of other occupations." Major topics are: job satisfaction and job success; opinion, attitude, interest, and satisfaction; measurement of motivation. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Conceptualizing and testing random indirect effects and moderated mediation in multilevel models: New procedures and recommendations.

The authors propose new procedures for evaluating direct, indirect, and total effects in multilevel models when all relevant variables are measured at Level 1 and all effects are random. Formulas are provided for the mean and variance of the indirect and total effects and for the sampling variances of the average indirect and total effects. Simulations show that the estimates are unbiased under most conditions. Confidence intervals based on a normal approximation or a simulated sampling distribution perform well when the random effects are normally distributed but less so when they are nonnormally distributed. These methods are further developed to address hypotheses of moderated mediation in the multilevel context. An example demonstrates the feasibility and usefulness of the proposed methods. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

钽铌水冶分解提取工艺及设备的进展

介绍了近些年来我国钽铌湿法冶炼中的资源结构，氢氟酸分解、矿浆萃取工艺以及工艺设备的进展情况。比较了主要工艺过程的技术经济指标，指出了当前生产中存在的一些问题，并提出了解决问题的一些意见。     

从铂钯物料中分离和提纯铂钯

介绍了铂钯提取工艺和生产过程。提出了在生产过程中存在的问题，提出了解决的方法。     

History and Renaissance of Construction Engineering and Management in Canada

Understanding the history of the construction engineering and management discipline in Canada can perhaps shed light on where the future of the discipline may lay and on external perceptions of the discipline. In its current state, the discipline in Canada is a unique model. Examining its positive and negative attributes will help inform strategic planning for construction research and education programs in Canada and in other countries as they adapt to rapid changes in their environments. The objective of this paper is to present sufficient information to make that examination possible. Its scope is limited to the last 200 years. Early pioneers in the discipline are described. Their careers are reflected in the developments that are summarized in the following discussion of the emergence of professional societies, and the educational and research infrastructure of the discipline in Canada. Recent developments in education and research are examined in more detail. Some final observations are then made based on this brief history.     

镍钴粉末生产现状及发展趋势

本文综述了国内外镍、钴粉末，特别是超细和纳米镍、钴粉末制备技术的研究和镍、钴资源的再生利用状况；概述了国内外镍、钴粉末的应用及生产状况；分析了我国镍、钴粉末生产企业面临的现状；展望了未来十年镍、钴粉末生产工业的发展趋势，提出了我国镍、钴粉末生产工业发展的对策。     

国外新型汽车用钢的技术要求及研究开发现状

为了满足未来新一代汽车工业发展的需求,开发了大量的新钢铁材料,如超高强钢(AHSS)、高强钢(HSS)、双相钢(DP钢)、TRIP钢,TWIP钢等。介绍了这些钢铁材料,给出并分析了它们的成分、结构、工艺、性能和特点。     

Thermodynamic Evaluation of Inclusions Formation and Behaviour in Steels during Casting and Solidification

For demanding applications high steel cleanliness and strictly controlled inclusions are required. Primary inclusions are formed during steel treatments in the ladle. Most of these are removed to the ladle slag or on the lining. However, the rest of the inclusions still remain through the successive process stages, and additionally new inclusions are formed during casting and solidification due to decreasing thermodynamic solubility of oxygen in the steel at lower temperatures, reactions with surrounding slag, refractory materials and eventual contact with air. Inclusions formation and transformation are simulated by thermodynamic calculations in the steel/inclusions/slag system taking into account the solidification phenomena. In this paper inclusions in Si/Mn‐deoxidised steel and Al‐deoxidised Ca‐treated steels are contributed. Calculations are compared with experimental results from steel plants.