中板轧机参数相关分析和轧制力矩计算

通过对四辊可逆轧机轧制过程测量数据的分析，初步探讨了轧机系统轧制力，牌坊拐角应力、轧制力矩、主电机电流、转速和轧机辊缝诸参数之间的相关特性，分析了用主电机电流和轧制力估计轧制力矩的精度。     

粉末轧制成形技术研究进展

介绍了粉末轧制过程，论述了粉末轧制技术的工艺参数、技术改进和以其为基础开发的半固态粉末轧制技术，阐述了近些年来粉末轧制技术的应用情况，最后对这些技术进行了总结和展望。     

棒线材轧制的上限法解

应用上限法建立了棒线材轧制的三维运动许可速度场，并通过对变形功率求最小值确定最佳的变形过程，该解析方法可用于求解平辊和凸凹型辊的二辊、三辊及多辊轧制过程的轧制力，轧制力矩和宽屏率等参数。其结果与刚一塑性有限元法计算结果进行了比较，其中力能参数与有限元法计算结果吻合较好，而且求解过程较刚一塑性有限元法更简便、灵活。     

中板轧机轧制压力人工神经网络预报

基于人工神经网络软件Matlab，采用改进的BP(Back Propagation)网络Levenberg-Marquardt训练规则，根据中板轧件入口厚度、出口厚度和宽度、轧辊直径、轧制速度和温度、轧件主要成分等输入参数，优化计算2350中板轧机的轧制压力和力矩。通过该网络的μ参数的自适应调整，提高收敛速度，使2350中板轧机轧制力和力矩的预报精度显著提高。轧制压力的BP网络预报值相对误差小于3％，轧制力矩的BP网络预报值相对误差小于4％。     

中厚板轧制过程中的轧制力和轧制力矩数学模型

本文提出了两个新的无量纲参数轧制力功系数和轧制力矩功系数,并通过对这两个参数的回归分析,建立了高精度的轧制压力和轧制力矩数学模型。     

中厚板MAS轧制过程的有限元模拟

采用有限元软件ANSYS／LS-DYNA对MAS轧制过程及随后的展宽和精轧过程进行了模拟计算,分析了各变形阶段钢板的形状变化及不同MAS轧制参数对钢板边部形状的影响。结果表明：MAS轧制可以改善轧后钢板边部形状。钢板边部形状的改变不仅与MAS轧制的补偿面积有关,而且与MAS轧制段长度和压下量的比值有关,若MAS轧制参数选取不当,钢板边部会发生“过补偿”现象。根据计算结果选取MAS轧制参数,在中厚板轧机上进行了现场生产试验,效果良好。     

650mm×4型钢轧机力参数试验

对两列型钢轧机力参数进行测定，得出两列型钢轧机单根轧制４个典型品种时的负荷率居中下限。交叉轧制的最大轧制力矩负荷率居中上限；一列轧机交叉轧制时的最大轧制力负荷率超设计能力。两分轴扭矩分配不均匀。     

VBA环境下热连轧带钢轧制力偏差统计分析实践

文章展示了一项通过VBA语言环境计算并统计CSP热连轧机组各机架预测轧制力与实际轧制力偏差的设计。在VBA语言环境下,计算某范围的各机架预测轧制力与实际轧制力偏差,并根据各项轧制参数分类统计,大大缩短了分析时间及人工计算误差,同时直观体现出各轧制参数、规格对预测轧制力精准度的影响,结合实际案例进行分析,说明各轧制参数对预测轧制力精准度的影响,对调整轧机二级相应参数具有较大的参考意义。     

异步轧制的过程的有限元模拟

应用弹塑性有限元商用软件Marc对二辊异步轧制过程进行了分析计算。给出了变形过程中的力学参数如应力，应变等变化状态，是确了异步轧帛的变形和受力状态，为轧制过程机械性能参数的合理化设置提供了依据。     

中厚板轧制过程中轧制力参数的动态修正

分析了一种中厚板的轧制力在线动态修正算法,该算法以实测轧制力为基础,通过道次实测轧制力和模型计算轧制力的值决定轧制力模型参数修正量的大小,真正做到以实测轧制力数据动态校正中厚板轧制力模型,大大提高了轧制力模型的预报精度并使其具有良好的自学习功能.该算法已经在现场获得应用,并具有良好的应用效果.     

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.