230Q中板四辊轧机的辊型研制

根据2300中板轧机的设备特点、轧制产品的工艺状况，开发了一个能适应轧件宽度变化范围较大的2300四辊轧机支撑辊辊型的计算机仿真程序，并研制了一种新的2300四辊轧机支撑辊辊型曲线，以提高该轧机的板形控制能力。研制的新支撑辊辊型曲线经过一年的工业化生产，取得明显的实效，钢板的横向同板差下降幅度达60％-75％；同时钢板的板形明显改善、薄板的边浪现象基本消除；另外轧制压力下降幅度达5%-7．5％，辊间压力分布变化趋缓、轧辊磨损减少、使用周期延长。     

2300中板四辊轧机的辊型研制

根据2300中板轧机的设备特点、轧制产品的工艺状况,开发了一个能适应轧件宽度变化范围较大的2300四辊轧机支撑辊辊型的计算机仿真程序,并研制了一种新的2300四辊轧机支撑辊辊型曲线,以提高该轧机的板形控制能力。研制的新支撑辊辊型曲线经过一年的工业化生产,取得明显的实效,钢板的横向同板差下降幅度达60%~75%;同时钢板的板形明显改善、薄板的边浪现象基本消除;另外轧制压力下降幅度达5%~7.5%,辊间压力分布变化趋缓、轧辊磨损减少、使用周期延长。     

HC轧机辊型曲线优化

HC轧机采用中间辊轴向窜动技术,使轧机的横向刚度显著增加,提高了板形控制能力。但由于中间辊轴向窜动后,在工作辊与中间辊、中间辊与支撑辊间形成接触压力峰值,导致轧辊局部磨损及带材表面质量问题。建立了HC轧机板形和断面形状计算模型,研究了支撑辊及工作辊辊型曲线对辊间接触压力分布的影响规律,在此基础上优化了1220HC轧机支撑辊及工作辊辊型曲线。理论计算及工业生产试验表明,在保证轧机板形控制能力前提下,在HC轧机支撑辊及工作辊上采用合适的辊型曲线,可将支撑辊与中间辊间的接触压力峰值降低20%以上,将工作辊与中间辊间的接触压力峰值降低10%以上,从而避免辊间接触压力峰值带来的轧辊局部磨损及相应的带钢表面质量问题。     

炉卷轧机辊系弹性变形与应用研究

根据南钢3500炉卷轧机工艺特点，采用三维有限元法（ANSYS软件）建立炉卷轧机辊系模型，研究了轧制力、弯辊力、轧件宽度、工作辊凸度的变化对辊系的影响规律以及辊间接触应力变化规律。根据模拟计算结果，设计了新的支撑辊辊型。现场实际应用表明，辊耗从0．218kg／t下降为0．165kg／t，降低幅度为20．67％，效果显著。     

四辊铝箔轧机支承辊辊型优化理论与实践

通过对四辊铝箔轧机辊系弹性变形、辊系热变形以及箔带三维塑性变形的分析计算,建立了铝箔轧机板形计算模型和支承辊辊型优化的数学模型。对某厂２１２０ｍ ｍ 铝箔轧机支承辊辊型进行了优化研究,将优化后的辊型应用于生产,提高了该轧机产品的板形稳定性、板形质量和成品率。同时也使轧辊端部剥落现象明显减少。     

冷连轧机辊型参数综合优化设计方法及应用

针对国内某1 420极薄带钢冷连轧机组辊耗较大,甚至偶发轧辊剥落和爆辊的问题,研究冷轧辊型曲线设计的一般方法,再结合对象轧机的设备与工艺,建立冷连轧机组轧辊辊型曲线参数优化设计模型,并为对象轧机优化设计出新的支撑辊辊型曲线和中间辊辊型曲线。新辊型曲线能够降低轧辊辊间压力分布不均匀程度,并改善弯辊力的调节效果,将其应用于该1 420冷连轧机组后,减少了辊耗与轧辊爆辊的发生率,改善了产品质量,提高了品牌竞争力,给企业带来了效益。     

2800mm中板轧机幂函数曲线辊型的研究

根据中厚板轧机轧制力和轧件宽度变化范围大的特点,在研制2800mm轧机辊型中,通过引进压力加权系数和宽度加权系数,使设计出的幂函数曲线辊型能自适应于生产中各品种规格的变化,特别是实现了工作辊辊型在支撑辊的整个服役期内可保持不变的目的,从而大大简化了工作辊的管理和储备量.生产实践表明,该辊型使用效果显著.     

四轴铝箔轧机支承辊辊型优化理论与实

通过对四辊铝箔轧机辊系弹性变形、辊系热变形以及箔带三维塑性变形的分析计算,建立了铝箔轧机板形计算模型和支承辊辊型优化的数学模型。对某厂２１２０ｍｍ铝箔轧机支辊辊型进行了优化研究,将优化后的辊型应用于生产,提高了该轧机产品的板形稳定性、板形质量的成品率。同时也使轧辊端部剥落现象明显减少。     

HC冷轧机凸度工作辊使用制度

针对某四机架六辊高精度控制辊型(HC)冷轧机组大压下率轧制时弯辊力时常饱和的问题，可将末机架工作辊辊型优化为六次多项式曲线，赋予工作辊正凸度，并适当降低承载辊缝的二次凸度和四次凸度，这样既可以增强轧机板形控制能力，也可以实现对中间辊磨损凸度的在线补偿，降低工作辊弯辊力。工作辊最大凸度优化值应根据轧制品种、轧制厚度和宽度规格、中间辊辊期长短进行综合考量。轧制试验结果表明，在1个中间辊辊期的初始阶段采用平辊型工作辊，中后期阶段采用凸辊型工作辊，可实现中间辊磨损凸度和工作辊初始凸度的良好匹配；连续轧制时弯辊力始终处于良好的调控区间，且对轧制品种和宽规格的适应性明显增强，板形综合值小于8 IU的比例可提升10%以上。     

六辊单机架可逆冷轧机中间辊辊型曲线优化

介绍了运用多目标多约束的组合优化方法,在六辊单机架可逆冷轧机上开发中间辊辊型曲线优化模型,从中选择出最优辊型曲线。分析了不同中间辊辊凸度条件下出口厚度、工作辊与中间辊的辊同压力分布以及中间辊与支撑辊之间的辊间压力分布规律。工业试验结果表明,该方法提高了中间辊交叉不投入时六辊单机架可逆冷轧机的板形控制能力。     

熔炼次数对M17返回料合金成分、组织和性能的影响

实验结果表明,M17铸造高温合金(%:0.16C、8.79Cr、5.79A1、4.93Ti、3.29Mo、15.20Co、0.78V、0.015B、0.073Zr、0.002S、0.001P、0.001 1O、0.001 0N)经25 kg真空感应炉返回重熔后,Si含量随重熔次数的增加而略有增加,合金中主要元素和其它杂质元素S、P、H的含量变化不大,而氧、氮略有增加;合金中初生碳化物由新合金中的草书体逐渐向返回合金块状转变,初生碳化物的遗传性堵塞合金凝固时的补缩通道,使返回料合金的疏松倾向增大,高温塑性下降较大。     

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.