TRT顶压控制系统及其安全性的研究与优化

介绍了天钢1~#TRT顶压控制系统,对现有的顶压控制系统进行了分析,在原有差压调节模式的基础上增加了顶压调节模式,将实际操作改为差压调节与顶压调节两种互选模式,提高了系统的发电效率;对旁通阀组的控制进行了优化,优化后极大地提高了系统的安全性,保证了炉顶压力的稳定,延长了设备的使用寿命,产生了较高的经济效益。     

浅议矿脉变化规律与探矿方法

概要介绍了樟东坑矿区的主要地质特征,在前人工作的基础上,对矿床的基本特征(尤其是矿脉的变化特征)进行了分析、探讨和总结;利用这些特性及其变化规律,采用一些新的探矿方法不但找到了一些隐伏盲矿,增加了地质储量,延长了矿山的服务年限,而且降低了探矿费用,减少了采矿的盲目性,节约了成本,增加了经济效益。     

工业机器人在鞍钢型钢生产线的设计与应用

根据鞍钢股份有限公司型钢生产线工艺实际,制定了机器人硬件设计方案和机器人软件实现方案,实现了工业机器人自动贴标喷码技术在型钢生产线的应用.该系统的应用满足了产线工艺要求,提升了产线生产效率,提高了产品标识的准确性和可追溯性,贴标准确率和喷码准确率均达到了99％,实现了危险岗位无人作业,作业周期缩短了25％;同时,实现了产品标识的统一规范性,提升了企业产品形象.     

轧钢加热炉改造

针对轧钢加热炉加热能力不足,炉墙冒火,自动化控制水平落后的情况,对加热炉进行了改造,延长了加热炉的长度,更换了单蓄热式空气烧嘴,并对自动控制系统进行了升级改造,从而消除了炉墙冒火的现象,提高了加热能力和自动控制水平,降低了煤气消耗,取得了良好的经济效益。     

RTK和全站仪联合采集数据模式在安钢GIS中的应用

介绍了RTK和全站仪联合采集数据模式在安钢GIS中的应用情况,通过两种测绘技术的优势互补,简化了程序,提高了效率,减少了误筹,保证了测绘精度,节省了人力和物力.     

废水处理站自动控制系统的应用

介绍了邯钢冷轧废水站的配套项目废水处理站的自动控制系统,主要从自控设备组成、网络控制系统等方面论述了控制功能的实现,该系统的应用为ERP的数据采集提供了很好的保证,提高了电气控制的集成度和可靠性,简化了控制环节,提高了生产效率.     

冷床上卸钢液压系统改造

对原液压系统设计及使用中存在的问题 ,进行了分析、计算 ,找出了原因所在 ,提出了改造方案 ,从而有效地提高了液压系统的稳定性 ,减少了设备故障 ,降低了维护强度 ,提高了工作效率。     

提高转炉护炉效果的实践

从转炉耐材的损害机理入手,分析了耐材的损耗机理,探讨了炉渣的优化机制,对炉渣的组成及渣料的使用进行优化,对溅渣的工艺进行了改进,实现了转炉护炉的提升,延长了转炉的使用寿命,降低了耐材的损耗,降低了转炉工序的成本。     

采用Boost技术优化企业数据备份保护架构

为了解决大型制造企业数据中心架构变更后,在数据保护方面所面临的多种难题,对适用的数据保护技术进行了研究探讨.最终实现了企业数据保护平台架构的转型升级,提升了平台自身的安全性,改善了备份数据的传输架构,备份效率提升了10倍以上.实现了备份任务的集中智能管理,节约了备份窗口,实现了备份资源的一次性分配与自动回收,释放了备份...     

镁挤压工业及技术发展概况与趋势

经过近20年的快速发展,我国镁挤压工业与技术获得了跨越式进步,不仅兴建了一批现代化的镁挤压企业,投产了一批3600t左右的现代化镁合金挤压机及其配套设备,而且开发了大批新技术、新工艺和新产品,大幅度降低了生产成本和提高了生产效率,拓展了应用领域,成为世界镁挤压大国。本文详细阐述了挤压成形在轻合金材料加工中的重要地位,指出热挤压成形是镁及镁合金材料最重要的加工方法,介绍了国内外镁挤压工业及技术的发展概况与趋势。     

Phase-field simulation of tip splitting in dendritic growth of Fe-C alloy

Two types of dendrite tip splitting including dendrite orientation transition and twinned-like dendrites in Fe-C alloys were investigated by phase-field method.In equiaxed growth, the possible dendrite growth directions and the effect of supersaturation on tip splitting were discussed;the dendrite orien-tation transition was observed, and it was found that the orientation regions of anisotropy parameters were reduced from three to two with increasing the supersaturation, which was due to the effect of interfacial anisotropy controlled by the solute in front of S/L interface changing with the increase of supersaturation.In directional solidification, it was found that the twinned-like dendrites were formed with the fixed anisotropy couples and no seaweed dendrites were observed;these were concluded from the results of competition between process anisotropy and inherent anisotropy.The formation process of twinned-like dendrite was investigated by tip splitting phenomenon, which was related to the chan-ges of dendrite tips growth velocity.Then, the critical speed of tips splitting and solute concentration of twinned-like dendrites were investigated, and a new type of microsegregation in Fe-C alloys was proposed to supplement the dendrite growth theories.     

热处理对纳米氧化锆粉末性能的影响

采用共沉淀法制备纳米ZrO2粉末,对其进行不同温度下的热处理,并对经过热处理的粉末进行物理性能及形貌的测试分析。对经过热处理的粉末进行等离子球化处理,并对其形貌进行观测。采用等离子喷涂方法制备ZrO2涂层,对涂层形貌进行观测。结果表明在适当温度对ZrO2进行热处理可提高粉末松装密度、流动速率及表面光洁度,提高粉末和涂层的综合性能。     

Application of Numerical Simulation Technique to Casting Process of Valve Block

 The numerical simulation technique was applied to the casting process of a valve type part. The mold filling and solidification stages of the casting were numerically analyzed. The filling behavior, solidification sequence, and thermal stress distribution were reproduced and the possible defects, such as cold shut and shrinkage, were predicted. Based on the simulation result, the double gating system was replaced by a single gating system. Meanwhile, the chills were used to regulate the solidification sequence of casting. To eliminate the cracks in the casting, the sand core was converted into a canulate one. By modifying the original process, the defects were eliminated and the casting with good quality was obtained.     

Forensic Evaluation of Premature Failures of Texas Specific Pavement Study–1 Sections

The Specific Pavement Study–1 pavement test section on US281 in south Texas comprise the largest Strategic Highway Research Program experimental site in the United States. The project was opened to traffic in 1997, and performance has been poor. Three of these test sections developed deep rutting within 1 year. Their surfaces were milled to restore ride quality. Three years after construction, 14 of the sections had 10 mm or more rutting. A forensic study was initiated by the Texas Department of Transportation to identify the cause of the problem. Nondestructive testing was conducted with both the falling weight deflector and ground penetrating radar. No structural problems were detected with either device, both indicating that the base and subbase layers were strong. A field investigation was initiated; the original plan was to cut nine trenches, however, after four trenches were cut, the problematic layer was identified and the trenching operation was terminated. Dynamic cone penetrometer, stiffness gauge, seismic pavement analyzer, and nuclear density gauge tests were then conducted on top of the base and subgrade layers. The trench profiles indicated that the rutting was coming primarily from the top 50-mm (2-inch) asphalt-concrete layer. Asphalt cores were taken from both rutted and nonrutted sections and bag samples of the base were tested in laboratory. The binder was recovered, and the asphalt content and penetration, aggregate gradation, and type were determined. The cause of the problem was traced to a change in aggregate screening, and also an excess of asphalt in the top layer.     

稀土在杜仲上的应用研究

选用易于观察研究的杜仲幼苗、幼林、种子、扦插用的枝条作为试验材料,研究了稀土在杜仲上的应用效果和施用技术,并研制了一种高效价廉的林用促长剂     

Studies of the methods used for the determination of the digestibility of crude fats in calves

An investigation was made of methods used for the exact determination of the crude content and crude extract of faeces. The following methods were examined: (1) Following treatment with hydrochloric acid a 1:1 mixture of ether and petroleum ether was used. (2) Following hydrolysis with hydrochloric acid extraction with ether was carried out immediately from the aqueous phases. (3) The analysis was carried out with Folch's solvent. A 1:1 mixture of methanol and chloroform was used. (4) The faeces were dried with infrared lamps and crude fat extraction was carried out with Folch's solvent. A 1:1 mixture of methanol and chloroform was used. (5) The faeces were dried with infrared lamps and extraction with ether was done in a Soxhlet apparatus. Nearly identical results were obtained with methods 1 and 2 or 3 and 4 in determining the content of crude extract, the acid number and the percentage proportion of fatty acids. Essential differences were found between methods 1 and 2 and methods 3 and 4. The most reliable results were obtained by using method (2). Method (5) was found to be most suitable for large-scale testing. Values for the content of crude extract in the faeces were somewhat lower (0.78%-1.2%) when determined by method (5). These variations were not significant statistically. (P greater than 5%). No significant differences were observed between methods (2) and (5). It was thus established that method (5) is best suited for estimating the crude extract of the faces. The faeces of calves were found to contain a high proportion of unsaponifiable matter. This proportion was subtracted from the percentage of crude extract and the amount of faecal crude fat was thus estimated. Very small but statistically significant differences were found by converting digestibility data of crude extract into those of crude fat. Hence, for future work the most appropriate method appears to be the estimation of the crude extract in feedingstuffs.     

TP拉链机的改进

分析了TP拉链机轨道、车轮、料斗磨损,TP拉链机跑偏,TP拉链机过载保护的不足,TP拉链机车轮轴承不能满足使用要求等问题发生的原因,提出了相应的改进方案。通过对方案的实施,取得了良好的效果。     

EH47船板钢热加工图的建立

 在Gleeble-3800热模拟试验机上,利用热压缩变形研究EH47号船板钢的热变形特性。设置最大真应变为0.7,变形温度分别为950、1 000、1 050、1 100、1 150 ℃,变形速率为0.1、0.5、1、5、10 s-1。利用试验所得数据通过一系列公式计算并绘制热加工图,结合不同压缩工艺得到的金相组织对比发现：变形温度为（1 000±10） ℃、应变速率为0.1 s－1区域耗散率因子[η]值达0.62以上,再结晶晶粒细小而均匀,为热加工最佳工艺参数;而变形温度为950～1 050 ℃、应变速率为0.5～2 s－1区域再结晶晶粒较少,晶粒尺寸参差不齐为加工失稳区,热加工时应避免选择该区域。根据热加工图中得出的最佳热加工工艺参数,计算得出现场最佳轧制参数：轧制温度为1 000 ℃,压下量为15～20 mm。     

火试金富集-重量法测定冰铜中金

研究了采用火试金法直接测定冰铜中的金的含量,确定了最佳实验条件。在氧化铅加入量达到铜量的35倍、硼砂加入量为15 g、溶剂样品与Na₂CO₃比为1∶0.7的条件下,且熔融温度为1 100 ℃、恒温温度为1 200 ℃、恒温时间为30 min时样品富集分离熔融制备的铅扣效果最好。分析了5个冰铜实际样品,并与原子吸收光谱法进行对比,研究结果表明：方法分析冰铜中的金含量时,分析结果与原子吸收光谱法分析值相吻合,加标回收率为90%~107%。方法的相对标准偏差为2.4%~4.9%。     

改善工程机械用型钢冲击韧性的实践

为解决高强度高韧性工程机械用型钢质量波动的问题,研究了钢种成分、夹杂物、魏氏组织等对低温冲击韧性的影响。采取适当降低锰和钒含量、使用铝脱氧及整体塞棒包全保护浇铸等措施,并对铸坯加热制度等进行了优化。优化后的产品性能及稳定性显著提高,一次检验合格率100%,屈服强度平均461MPa,抗拉强度平均602MPa,断后伸长率平均22%,-5℃冲击值平均61J,金相组织中魏氏组织基本消除,晶粒度7.5~8.0级。