六辊CVC辊系辊间横向轧制力分布的研究

多辊轧机的辊间横向轧制力分布直接影响有载辊缝的形状和板形控制的结果。运用影响函数法建立了1850mm六辊CVC轧机辊系弹性变形及辊间横向轧制力分布的物理和解析模型,并对中间辊窜辊、中间辊弯辊和工作辊弯辊变化对横向轧制力分布的影响进行了分析研究,建立了计算机仿真程序,给出了辊间横向轧制力分布的规律。分析结果为六辊CVC轧机确定合理的板形控制策略奠定了理论基础,对获得良好板形控制具有指导意义。     

二十辊森吉米尔轧机板形控制方法

介绍了二十辊森吉米尔轧机板形控制方法和各道次板形控制要求。二十辊森吉米尔轧机虽然具有很强的板形控制能力,然而也同样具有可逆冷轧机的一些缺点,如起车轧制和甩尾作业板形变化剧烈,甚至轧制过程中均需要操作工手动控制,二十辊森吉米尔轧机板形调控手段虽多,但有时并不能轻易地消除复杂的不良板形。生产实践表明,预设好第 1 中间辊第 1 道次起车值、控制好带钢板形对称和带钢边部受力情况以及统一规范各道次的轧制板形控制均能有效避免断带,保证二十辊森吉米尔轧机顺稳轧制,提高硅钢产品板形的均一性。     

热轧薄带平整机支撑辊辊型优化的研究与应用

某热轧薄带平整机轧辊长度为1 800 mm,带钢宽度为1 320 mm,两者相差太大,造成工作辊与支撑辊间有害接触区长度过大,在轧辊自身挠度作用下,辊间应力峰值集中于带钢边部位置.随轧制公里数延长,工作辊边部磨损加剧,不利于后期板形控制,同时会缩短轧辊使用寿命.针对热轧薄带平整机工作辊磨损不均匀问题,设计优化支撑辊辊型...     

轧制不锈钢多辊轧机的比较

简述了14辊、18辊及20辊轧机机架及辊系的结构特点,及其在不锈钢板带生产中的应用.通过比较各种辊系,认为18辊轧机特别适用于1 250 mm板宽不锈带钢的开坯及轧薄;14辊轧机特别适用于1 000 mm以下不锈钢轧板带及铜板带等合金板带的轧制;20辊轧机则特别适用于精密薄带的轧制,由于其板型调节手段最全,此机型轧制出的板型效果最佳.     

1700mm高速铝箔轧机板形特性与板形控制实践

铝箔板形是轧制过程中一个受高度重视的课题,本文从辊系优化．轧制控制方案及其它相关影响因素入手,对1700mm高速铝箔轧机的板形控制特性进行分析,以指导生产实践。     

UCM轧机中间辊横移控制模型与应用

为了提高冷轧带钢的板形质量,在1250单机架6辊可逆冷轧机板形控制系统改造中,根据轧制工艺,设定了中间辊初始位置。基于板形调节机构的调控功效,由闭环板形控制系统给出了中间辊在线横移的调节量。为了减少横移对轧辊磨损的影响,通过试验以及数值计算分析了中间辊横移阻力与横移速度以及轧制力之间的关系,对中间辊横移速度进行了设定。经现场应用表明,中间辊横移控制模型具有较高的板形控制精度,对实现冷轧带钢的高精度板形控制具有重要作用。     

六辊冷轧机油缸缸体的修复

为提高带材的板形精度,近几年在四辊轧机的基础上,增设了可作轴向移动的中间辊的新型六辊冷轧,并在中间辊采用液压油缸来实行轴向移动,从而实施对轧制板型的控制,但在用户实际使用过程中,发现有些油缸的孔径严重拉损,造成不必要的停产。     

热塑有限元的理论分析及应用

利用热塑有限元对板材轧制过程进行模拟计算,能够计算轧制力、轧制力矩、辊形、板形等参数,对板材轧制起到定量计算的作用。热塑有限元在板材生产中能计算最佳辊型、板形、弯辊力、串辊位置以及压下制度,达到提高成材率、提高板材质量的目的。热塑有限元是一种三维的弹塑性有限元,它应用的本构方程是由试验数据回归得来的,使用了加工硬化、拉拔效应等计算方法,计算结果精确。     

六辊冷轧机油缸缸体的修复

随着工业技术的发展，对带材质量的要求越来越高，特别是带材尺寸精度也成为重要质量指标之一。为提高带材的板形精度，近几年在四辊轧机的基础上，增设了可作轴向移动的中间辊的新型六辊冷轧，并在中间辊采用液压油缸来实行轴向移动，从而实施对轧制板型的控制。但在用户...     

六辊冷连轧机板形前馈控制模型的研究

冷连轧过程中,轧制力波动对板形的影响很大,需要采用弯辊力进行实时的补偿。针对六辊冷连轧机,分别研究了仅用工作辊弯辊和采用工作辊与中间辊弯辊相结合的板形前馈控制模型。实际控制效果表明,这两种板形前馈控制模型都能有效消除轧制力波动对板形产生的不利影响;采用工作辊弯辊的板形前馈控制模型只能控制由于轧制力波动产生的二次板形,而对四次板形几乎不产生影响;而采用工作辊与中间辊弯辊相结合的板形前馈控制模型则对二次和四次板形均具有很强的控制能力。     

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.