连铸坯定尺测量系统及其离群值LOF滤波处理设计

连铸坯定尺测量系统的精度和稳定性是影响连铸产量和产品质量的关键因素,为克服原有接触式光电编码器测量系统精度低和稳定性差的缺点,研究和解决了将原有光电编码器测量系统升级为非接触式激光自动定尺测量系统时涉及的定尺切割控制和HMI监测问题,实现了与原有PLC控制系统和HMI监测系统的无缝连接,提出了局部异常因子(local ...     

连铸液压剪机横移跟随系统

液压剪是连铸定尺剪切常用设备,液压剪在使用中存在最大问题是“拉坯”现象,造成定尺精度低,不利于结晶器液面自动控制和保护性浇铸,连铸液压剪机跟随系统能消除拉坯现象。     

连铸坯在线定重切割技术工艺实践

连铸坯重量由连铸坯断面尺寸、钢坯长度及其密度三个因素决定。这三个因素又与结晶器铜管服役期内磨损程度、浇注温度、拉速、定尺切割精度和钢水成分有关。因此通过连铸坯在线称重结合定尺微调,可以控制连铸坯定重精度,达到最大程度提高轧钢钢材成材率、定尺率的目的。我厂通过自主设计研发的连铸坯在线吊钩式提升称重法获取连铸坯单支重量,及时调整定尺,配合连铸"恒温度、恒拉速"操作模式,稳定连铸坯定重,连铸坯定重准确率明显提高。     

S7-PLC模拟编码器在连铸机自动定尺切割系统中的应用

通过S7-400PLC编写的模拟编码器,为连铸机自动定尺切割系统添加了自动报警,不仅提高了自动定尺系统的稳定性,而且提高了连铸坯的定尺合格率,使连铸生产得以顺利进行,极大地减轻工人的劳动强度。     

连铸坯定尺控制优化

为减少连铸方坯短尺，提高定尺坯合格率，通过对碳与铸坯收缩率的研究，得出最佳的定尺补偿长度，以及通过计算机来控制换中包及收尾坯产生的短尺坯的方法。     

连铸板坯高精度切割控制技术的研究及应用

连铸坯的定尺切割是连铸生产工艺中影响成材率的重要环节.检测辊存在磨损、打滑等因素影响一次切割定尺精度.由于二次定尺切割板坯惯性差异大,难以通过调节变频器给定频率及传统机械弹性挡板实现二次切割前的准确定位.采用CCD摄像和数字图像边缘检测技术.实现了连铸板坯一次定尺切割控制和铸机拉速的动态跟踪,提出并实现了一种独特的液压缓冲、回推精确定位的二次定尺切割方法.实际运行结果表明,两次切割成材率达到98.5%,对多流连铸坯、中板、重轨等产品的定尺切割问题具有较好的参考价值.     

PLC定尺系统在莱钢炼钢厂5^#连铸生产中的研究与应用

莱钢股份有限公司炼钢厂5^#连铸机的红外无接触定尺系统受火焰切割干扰较大,切割精度不高,经常造成铸坯长短尺的问题,针对这一问题莱钢炼钢厂开发了PLC定尺系统,很好地解决了5^#连铸机的定尺问题。莱钢5^#连铸机是一台六机六流的小方坯连铸机,原来采用红外线无接触定尺系统。     

用于连铸坯摄像定尺的标定装置

为了获得连铸坯坯头准确的位置数据,确保连铸坯的定尺精度,开发了用于连铸坯摄像定尺的标定装置。介绍了此装置的原理、组成和设计以及该标定装置在钢厂的实际应用情况。实践表明:该标定装置结构简单、质量轻、操作方便,能一次性标定完所有不同截面尺寸的连铸坯,标定时间少。     

直接轧制中连铸坯输送节奏衔接的优化

通过运筹学中的排队理论,建立了方坯直轧系统中连铸坯排队模型,并对唐钢公司长材事业部方坯-棒材直轧系统分析优化,为企业生产管理提供理论依据。结果显示,当连铸机拉速为3.8 m/min,连铸坯定尺为11.9 m时,4流生产只能满足Φ 12 mm热轧带肋钢筋的轧制节奏,5流生产可以满足所有规格轧制节奏;拉速一定时,铸坯的最大等待时间随定尺的增大而增大,但生产中一般采用调整拉速来改变连铸坯平均等待时间,而非通过调整连铸坯定尺来实现;连铸坯输送过程,空冷到最低开轧温度所经历的时间应小于连铸坯的最大等待时间,此时直轧产线铸坯的直轧率最高;根据铸-轧通钢量相等的原则计算,方坯直轧应该采用少流数、高拉速,短定尺来组织生产,使铸-轧产能匹配同时减少直轧铸坯的头尾温差,降低生产事故风险;方坯直轧系统的主要问题是连铸坯剪切顺序、钢-轧节奏匹配问题、连铸坯的最大等待时间等3项核心问题。     

连铸坯定重剪切技术的开发与应用

在连铸生产线上进行了由定尺剪切到定重剪切的连铸坯剪切技术开发与应用的研究，成功开发了上置式连铸坯定重剪切装置——钢坯称重机械手（已获专利），研究与解决了连铸生产线上N个流的被称重的钢坯是用同一台称，避免了多台称多个误差的称重数值偏差的问题；进行了定尺剪切连铸坯与定重剪切连铸坯生产过程的对比。研究结果表明：成品制作的定尺率、成材率有明显提高；同时指出这种技术的应用要求建立在过程工艺管理的平台上。     

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.