棒材二辊矫直过程中的辊缝工艺参数

针对棒材实际矫直过程中辊缝不易确定的问题,采用大型非线性有限元软件建立棒材二辊矫直过程的三维弹塑性有限元模型,基于该模型研究了不同辊缝下矫直力、成品棒材残余应力、最大挠度和塑性变形深度的变化规律,综合分析提出合理的辊缝取值范围,并在实际生产中得到应用,减少了实际生产中辊缝调节所需时间.     

两辊矫直机辊形磨损后的矫直辊调整

矫直作为棒材生产中的精整工序的重要一环,能够通过矫直机带来的塑性变形,优化棒材的平直度,为下道精整工序做好准备,可以说对产品的质量有着极其重要的意义.随着越来越多的钢铁企业开始转型进入特钢行业,两辊矫直机的作用也随之愈发重要.文章基于在南钢精整厂使用两辊矫直机情况,对矫直辊磨损的不同情况下的矫直调整分析.研究其中的客观关系,论文结果对企业生产具有指导意义.     

角钢矫直辊创新设计

简单介绍了一种改进的角钢矫直辊.以不改动矫直辊安装机构为前提,利用隔离环代替矫直辊两侧的辊环,并采用相邻角钢矫直辊规格共用和不全包裹式矫直角钢的设计,从而起到优化矫直辊结构形式、降低矫直辊重量、提高矫直辊有效重量比例的作用.有效解决了型钢矫直辊体积、重量大、不易安装的问题.     

硬面堆焊复合制造板轧矫直辊研究

采用研制的３４ＣｒＭｏ２ＭｎＶ合金堆焊复合制造２０、５０ｍｍ钢板轧机硬面系列矫直辊，结果表明：较之原５５Ｃｒ辊，使用寿命提高５倍以上，板坯表面质量大为改善。简介了５５Ｃｒ矫直辊的失效机理，高碱度陶质焊剂的配方，以３４Ｃｒ４Ｍｏ２ＭｎＶ堆焊合金的硬度、金相组织以及该合金硬面矫直辊的堆焊复合制造工艺。     

棒材二辊矫直机辊型曲线与矫直精度分析

 为了改进二辊棒材矫直机矫直质量,从弹塑性弯曲理论出发,用Matlab求解双曲线和三曲率二辊矫直机辊型曲线,并绘制相应的辊型图。分别计算了双曲线和三曲率辊型曲线的矫直精度,结果表明三曲率辊型曲线矫直精度高于双曲线辊型曲线的矫直精度。综合考虑棒材的弹塑性变形,基于有限元MARC平台,根据具体实例建立了棒材二辊矫直弹塑性模型,并对其矫直过程进行模拟,分析了棒材在矫直过程中各种参量的变化。对比分析不同辊型下棒材矫直效果,三曲率辊型矫直效果要好于双曲线辊型,可为实际生产提供理论指导。     

变辊距矫直的辊距优化设计

对辊距实现优化设计,分别以总矫直力之和矫直力为目标函数,以辊距为设计变量,利用Matlab软件优化设计出辊距相对值,以轧件与辊子间的接触应力为约束条件,进一步获得最佳辊距实际值。在满足矫直要求的前提下,通过变辊距实现了减小矫直力和矫直功的目的,对矫直过程的节能降耗及减小薄壁构件由于矫直力过大产生的矫直缺陷有重要意义。     

辊式矫直机辊径和辊距影响因素分析

辊径和辊距是辊式矫直机最重要的基本参数。从矫直质量出发，分析了咬入条件、接触应力和强度条件对辊径和辊距的影响。结果表明，强度条件是影响辊距和辊径的关键因素，是确定辊式矫直机辊径和辊距重点考虑的因素，其他因素可用来评价由强度条件确定的辊径和辊距的适用性。该结果对辊式矫直机的设计与开发具有指导意义。     

ANSYS分析钢轨矫直机组合矫直辊的力学行为

文章针对钢轨矫直机矫直辊易产生磨损,磨损后整体更换浪费材料的情况,考虑采用磨损后的原有矫直辊加工后作为芯部,然后在芯部外周加上与之配合的辊环,制作成一个组合矫直辊进行矫直工作.采用ANSYS软件模拟改造后的组合矫直辊的工作状态,判断改造后的矫直辊是否能在实际的矫直过程中达到使用要求.     

浅谈矫直辊使用寿命的提高

原矫直辊由于设计上的不足及装配时的不科学，使用一段时间后钢板容易出现质量缺陷，被迫频繁更换轿直辊。通过提高矫直辊的表面淬火硬度，并在装配上采取改进措施，使得矫直辊的使用寿命得到了较大提高，降低了备件费用和故障时间。     

临钢中板厂矫直辊修复及使用探讨

矫直辊辊面质量决定矫直钢板的产量和质量，介绍了矫直辊的缺陷，对其修复工艺进行了探讨。进行修复后，最大限度地满足生产需求，节约成本。     

China's Major Non-ferrous Metals Imports & Exports

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Zinc Production by Province in 2014

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80% of Chinese Firms Purchasing Overseas Mines Ended up in the Red

<正>Minmetals Resources acquired the world’s largest copper mine under construction for USD5.85 billion.One after another,listed companies Jien Nickle,China Molybdenum and Chihong Zinc and Germanium raised money to get involved in overseas mining projects…SOEs and private enterprises are engaged in a frenzy of overseas mine purchasing.A reporter with Economic     

Copper Processing Profit Dropped Sharply,Copper Consumption Will Face Impact in the Second Half of the Year

正Judging from China’s copper consumption field,the biggest consumption unit is electric power,which accounts for 47%of total consumption;it is followed by light industry sector,including household electrical appliance,machinery,durable goods and hardware etc,which accounts for 22%of total consumption;followed by transportation field,     

Central Geological Prospecting Fund Newly Added 16.47 Million Tonnes of Bauxite in 2013

正In 2013,the Central Geological Prospecting Fund(CGPF)Project newly discovered 15 ore fields,including 3 large above ore fields,and 5medium sized ore fields.The reporter learned from the recently published"Annual Report of Central Geological Prospecting Fund Project(2013)"that,from 2006 to 2013 the CGPF     

Manufacturers of Copper Tube for Central Air Conditioner Use Face Mounting Pressure in the Final Quarter of the Year

正This year,the investment growth rate of real estate industry continued to slow down,sold area of commercial housing also dropped significantly,which brought huge pressure to the domestic air conditioning manufactures.In the first half of the year,by relying on high growth in national financial expenditure,along with investment in public infrastructure     

Xinjiang Ranks No.1 in Production of Primary Aluminum in China

正Kang Yi,Honorary Chairman of China Nonferrous Metals Industry Association,said recently at the Forum on Development of the Non-ferrous Metals Industry in Central and Western China held in Zhengzhou that,as more and more electrolytic aluminum factories in Xinjiang came into operation,the electrolytic aluminum output of Xinjiang had reached2,275,000 tons in the first 7 months this year,     

Shenhuo Coal Industry and Electricity Power Completed800,000 t/a Aluminum Project in Xinjiang

正"Xinjiang project has been completed according to schedule,but total completion and total start of production are two different concepts,after completion it still needs a gradual process of reaching production target."On the morning of November 3,Shenhuo Coal Industry and Electricity Power told investors the above statement on the investor interaction platform.     

Guangdong Metal Transaction Center has Become the Second Largest Precious Metal Transaction Platform Nationwide

正The reporter learned from Guangdong Province Precious Metal Transaction Center that in 2013the Center maintained healthy development momentum,and had become the second largest precious metal transaction platform in China in terms of market size;currently Guangdong is quickening steps of financial innovation for the Center,aiming to build a transaction center with international core competitiveness.     

Seven Rare Earth Projects Involving Close to 3 Billion Yuan Investment Landed In the HighTech Zone

正On May 22,Baotou Rare Earth Industry Cooperation Consultation MeetingProject Agreement-signing Ceremony was held in Ningbo,nearly 40 enterprises from Ningbo,Guangdong,Hunan,and Shanxi participated in project consultation.After multi-lateral communication,agreements were signed for a total of 7 rare earth projects successfully.