高精度激光板凸度检测技术

板厚度、板凸度是衡量板材质量的重要指标,激光板凸度检测系统的核心技术是基于差动激光三角法的扫描式高精度厚度检测系统.本文介绍该系统的组成和功能,着重分析该系统设计过程中的关键技术.通过实际应用表明,本系统的检测精度达到±1 um.     

RM312凸度仪在梅山热轧厂的应用

介绍梅山热轧厂使用的RM312凸度仪的系统组成、立体测量技术和性能。使用该凸度仪实现了对热轧带钢横断面厚度的高分辨率快速测量,横断面厚度测量区域分辨率达5mm,响应时间达10ms。另外,独特的立体测量技术还使其具有宽度测量、平直度测量等功能,而且能够补偿板形缺陷对测量的影响,有效提高在线测量精度。     

宽带钢工作辊轧制中凸度的研究与控制

工作辊热凸度与轧制时间、轧制速度、轧制节奏、轧辊冷却水等有着密切的关系,充分了解轧辊热凸度在轧制过程中的变化,不仅可以提高宽带钢热连轧机组热辊形的模型控制及预报精度,而且可以通过及时调整轧制节奏和轧辊冷却水系统的工作情况来调整轧辊热凸度,对于板形控制具有重要意义。     

冷轧钢板表面三维微观形貌测量系统

在论述冷轧钢板表面三维微观形貌测量必要性的基础上,介绍了利用白光干涉特性进行了测量的扫描白光干涉的测量原理及测量系统,采用幅值解调算法确定测试点高度,既提高了测量精度又缩短了测量时间。由一个冷轧钢板测量实例,列出了经过平滑处理后的具有良好视觉效果的三维微观形貌图。     

Citisteel 4060mm 宽厚板轧机板形问题的分析和改进措施

通过对 Citisteel三年板凸度数据的分析 ,认为采用合理的配辊制度和精心操作可提高板形质量 ,通过增加轧辊原始凸度可降低平均板凸度 ,但不能改进板凸度的标准差 ,因此生产出来的钢板凸度波动较大。分析后认为采用动态设定板形测控方法的板形最佳规程 ,不但可以进一步降低平均板凸度 ,而且可以大大降低其标准差。通过与中国首钢和舞钢两套宽厚板轧机对比及参考它们的经验 ,Citisteel工作辊换辊周期应当减小 ,轧 4 0 0 0 t左右换一次工作辊比较合适。文中提出用动态设定型板凸度模型建立轧辊热凸度模型的新方法     

提高热轧硅钢凸度精度的工艺措施

以太钢热连轧厂的硅钢为研究对象,利用凸度仪测量热轧带钢出口凸度值,采用矩阵和失效模式的分析方法了解影响带钢凸度变化的主次因素。研究结果表明:通过有效控制轧制过程中的加热温度、时间及采用合理的辊型,硅钢凸度精度提高了4.34%左右。     

钢铁冶金工业激光三角法抗强热辐射干扰方法研究

强热辐射干扰光通常限制了激光三角法在高温物体位置测量中的应用。以钢铁冶金工业连铸中间包覆盖层高度为测量对象，从CCD成像理论出发，分析了影响激光三角测距系统信噪比的相关因素，给出了信噪比计算公式和系统光学参数设计。基于色调滤波的思想，测量系统允许大部分激光工作波长的光照射到CCD上，并结合色调差异与形态学滤波的方法将强热辐射干扰光彻底滤除。现场试验表明，即使热辐射干扰光强在全波段下强度超过激光信号，该方法仍能可靠辨识激光信号并滤除热辐射干扰光。与传统采用极窄带深截止滤光片的方法相比，以较低的成本实现了激光三角法对1 400℃被测目标的可靠测量。     

热轧钢板矫直工艺的有限元分析

采用有限元软件ANSYS对热轧钢板矫直工艺进行模拟,研究了钢板同一初始状态下采用两种不同矫直工艺参数模拟后的结果,以及在同一矫直工艺参数下对钢板施加不同初应力载荷的模拟结果.探讨了钢板矫直过程中残余应力的变化情况以及矫直工艺参数与钢板残余应力的关系.模拟结果表明:在矫直过程中钢板表面都要经过拉一压-啦一压-拉的反复弯曲过程;对于纵向残余应力分布不均的通过模拟矫直能够达到明显的改善,并且在上矫直辊增加凸度值对消除横断面上的内应力分布不均是非常有效的.     

斜井测量工程实践研究

施工测量在陡倾角斜井施工中起到非常重要的作用，使用传统的测量方法不仅次数太多，影响施工进度，而且开挖角度及掘进方向不容易控制。并且由于施工的特殊性，造成施工测量难度大、危险性高、测量精度难以保证等问题。通过采用精确控制的测量方法和激光指向仪，可以方便的指导施工人员调整掘进方向，保证测量精度，减少测量放样时间，提高工作效率。现以南部探矿斜井工程为例，“三维坐标法”标定腰线，使用精确控制测量及新型激光指向仪进行施工测量放样，满足了放样精度和施工质量，值得在其他类似工程中推广应用。     

钢板长度测量模糊控制器的构建

潍坊钢铁集团公司钢板横剪生产线,采用Prifibus-DP网络总线控制技术,以PLC为控制核心,对钢板长度进行自动测量并自动剪切钢板,为了提高钢板剪切精度,在模糊控制的基础上,还增加了系统自学习和人工自学习功能.实际应用表明,该控制系统技术先进、可靠性高,钢板剪切精度在钢板长度为7～10 m时,误差仅为0～±4 mm,完全满足控制要求.     

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.