连续混捏机扭矩自动控制的研究与实践

在铝用阳极成型自动控制系统中,连续混捏机扭矩的自动控制是生产优质阳极的关键因素;从连续混捏机工艺原理、混捏机扭矩控制方式的不断改进及实现扭矩自动控制方案的设计和实现等方面进行介绍,打破了以往只有依赖美国BP厂家工程师才能实现混捏机控制改进的历史,通过不断探索和研究实现混捏机扭矩自动控制功能有效提高并稳定了产品质量。     

关于阳极成型工序的设备配置及选型的探讨

为改善连续混捏的糊料的均匀性 ,建议在料进入混捏机之前加一道干料混合 ,这样在连续混捏条件下可改善糊料质量     

爱立许混捏机的性能特点及其应用

主要介绍德国爱立许混捏机的性能特点，说明爱立许混捏机较传统连续混捏机性能优越，应用前景广阔。     

Buss连续混捏机G160D减速机修理方法的研究

结合理论分析和实际应用的成功经验，对Buss连续混捏机G160D减速机的修理方法进行研究，并详细阐述该减速机在修理过程中的关键点。     

铝用预焙阳极连续混捏新技术应用

本文概述了我国混捏技术发展历史及现状,介绍了我公司铝用预焙阳极连续混捏新技术的工艺特点和装备特点,对新技术涉及的强力高温混捏、强力冷却再混捏、混捏时间、系统弹性、原料适应性以及设备维修特性等做了分析研究,对新技术的成功应用做了验证分析,充分证明新技术的应用是经济的、可行性的先进技术,值得行业借签和推广。     

新型混捏机在炭素生产中的应用

介绍国产新型混捏机在工程中使用情况、结构特点及其主要技术性能，在总结实际使用效果的基础上，提出了混捏机系列型谱。     

炭素成型生产线Coperion混捏机主变频器国产化改造

中铝兰州分公司炭素厂生阳极生产线,采用Coperion厂家的混捏机,主变频器采用的是Allen-Bradley公司的POWERFLUX 700H系列400 kW网络变频器,但是经过多年使用,变频器问题较多,严重影响炭素生阳极生产。本文通过对变频器进行国产化改造,采用英威腾CHF100A系列矢量通用型变频器,改变频器的通讯方式和混捏机的控制程序、调整混捏机的控制工艺,使新变频器能够替代原型号变频器的使用,完全满足炭素生产要求。     

交流变频调带技术在连续混捏机上的应用

介绍交流变频技术在碳素行业连续混捏机上的使用情况,说明变频技术在连续混捏机上应用的可行性、经济性及前景.     

交流变频调速技术在连续混捏机上的应用

介绍交流变频技术在碳素行业连续混捏机上的使用情况,说明变频技术在连续混捏机上应用的可行性、经济性及前景。     

强力混捏冷却系统在阴极生产中的应用

主要介绍了中铝贵州分公司碳素厂五成型车间引进的德国爱立许强力混捏冷却系统生产阴极碳素制品,对电阻加热器及强力混捏冷却机的工作原理、工艺过程进行了阐述,分析总结了使用强力混捏冷却系统生产阴极碳素制品的优点。     

Within-child associations between family income and externalizing and internalizing problems.

Within-child associations between family income and child externalizing and internalizing problems were examined using longitudinal data from the NICHD Study of Early Child Care and Youth Development (2004a, 2004b; N = 1,132). Variations in income effects were estimated as a function of whether families were poor, whether mothers were partnered, and the number of hours mothers and their partners were employed. On average, children had fewer externalizing problems during times when their families' incomes were relatively high than during times when their families' incomes were relatively low; the estimated benefits of increased income were greatest for children who were chronically poor. For both externalizing and internalizing problems, income was most strongly associated with problems when chronically poor children's mothers were partnered and employed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Reliability of Settlement Prediction—Case History

A geotextile-reinforced embankment was built over soft ground. Staged construction and vertical prefabricated drains were used to obtain strength gain via consolidation of the foundation material. Settlement and pore pressure were measured as a part of construction control. Settlement, differential settlement, and rate of consolidation were predicted by simple models. Uncertainties in the predictions were evaluated to assess the reliability of the predictions. The estimated errors were compared with the measured values, and major contributors to prediction errors were identified.     

Distortions and tensile properties of 15-5PH steel cylinders with EBW and heat treatment

15-5PH steel is one of the martensitic precipitation-hardened stainless steels, which is extensively applied in the aero shafts, and electron beam welding is a significant procedure to manufacture the parts. To verify the dimension accuracies and properties, EBW with oscillation was employed on the cylinders of 15-5PH steel. The welding distortions were measured, and the microstructures and tensile properties of the joints were investigated. The weld appearances of the cylinders were smooth, and the morphology was parallel. After EBW, the shrinkages of the cylinders were above ?0.22?mm, and the welding distortions were ?0.66 to ?1.1‰, and the straightnesses were less than 1‰ due to the distortions. The martensites and a few austenites were in the welds of the cylinders after heat treatment, and the microhardnesses in the welds were 445 HV0.2, which were bigger and more homogeneous than those of the as-welded. The tensile strength and yield strength of the joints were respectively 1300 and 1150?MPa, which were higher than those of the as-welded joints, and the elongation rate of the joints was 10%. The microstructures and properties of the cylinders conformed to the aero shafts, which was attributed to the microstructure transformation with oscillation EBW and heat treatment.     

X射线荧光光谱技术在铁矿石分析中的应用文献评介

系统汇集了20世纪70年代以来我国使用X射线荧光光谱(XRF)分析技术进行铁矿石分析的文献共计101篇,其中熔融制样法文献78篇,粉末压片法文献11篇,能量色散仪器分析及野外现场应用文献12篇。首先介绍了铁矿石分析的基础条件:包括专著、标准物质、标准方法和综合性评述论文;然后采用表格方式对文献要点进行了介绍, 按熔融法、粉末压片法、能量色散多元素分析方法进行了重点评介;最后讨论了铁矿石分析中常遇到的粒度、矿物效应,制样方法选择和内标的应用等实际问题。对XRF在铁矿石分析中的某些重要问题进行了探讨,并对XRF分析铁矿石的应用前景作了展望。文献表明:XRF技术已经成为铁矿石主、次量元素分析最重要的分析方法之一。全篇引文151篇。     

FeCuNbSiB粘结磁体的制备及磁性能研究

通过2种途径将熔体快淬法制得的FeCuNbSiB非晶薄带制成环状粘结磁体。一是将非晶薄带进行晶化处理,再将晶化后的薄带粉碎成不同粒度的粉末,然后与粘结剂相混合制成粘结磁体。二是将非晶薄带直接粉碎成不同粒度的粉末,再将此粉末进行晶化处理,将晶化后的磁粉与粘结剂相混合制成粘结磁体。分析了磁粉粒度和模压压力对粘结磁体性能的影响。并对两种粘结磁体的性能进行比较。结果表明,第一种方法制备的粘结磁体的性能优于第二种。     

Seismic Response of Interior RC Beam-Column Joints Upgraded with FRP Sheets. I: Experimental Study

In this paper, efficiency and effectiveness of carbon fiber-reinforced polymers (CFRP) in upgrading the shear strength and ductility of seismically deficient beam-column joints have been studied. For this purpose, four reinforced concrete interior beam-column sub-assemblages were constructed with nonoptimal design parameters (inadequate joint shear strength with no transverse reinforcement) representing preseismic code design construction practice of joints and encompassing the vast majority of existing beam-column connections. Out of these four, two specimens were used as baseline specimens (control specimens) and the other two were strengthened with CFRP sheets under two different schemes (strengthened specimens). In the first scheme, CFRP sheets were epoxy bonded to the joint, beams, and part of the column regions. In the second scheme, however, sheets were epoxy bonded to the joint region only but they were effectively prevented against any possible debonding through mechanical anchorages. All four subassemblages were subjected to cyclic lateral load histories so as to provide the equivalent of severe earthquake damage. Further, the damaged control specimens were repaired after filling the cracks through epoxy and wrapping them with CFRP sheets under the same two above-mentioned schemes. These repaired specimens were subjected to the similar cyclic lateral load history and their response histories were obtained. Hence, a total of six specimens were tested: two control; two strengthened; and two repaired. Response histories of control, repaired, and strengthened specimens were then compared. The results were compared through hysteretic loops, load-displacement envelopes, column profiles (maximum horizontal displacements of column along its height), joint shear distortion, ductility, and stiffness degradation. The comparison shows that CFRP sheets improve the shear resistance of the joint and increase its ductility. Results of two chosen schemes of strengthening were also compared and the importance of beam upgrading was highlighted.     

X射线荧光光谱技术在铁矿石分析中的应用文献评介

系统汇集了20世纪70年代以来我国使用X射线荧光光谱(XRF)分析技术进行铁矿石分析的文献共计101篇,其中熔融制样法文献78篇,粉末压片法文献11篇,能量色散仪器分析及野外现场应用文献12篇。首先介绍了铁矿石分析的基础条件:包括专著、标准物质、标准方法和综合性评述论文;然后采用表格方式对文献要点进行了介绍, 按熔融法、粉末压片法、能量色散多元素分析方法进行了重点评介;最后讨论了铁矿石分析中常遇到的粒度、矿物效应,制样方法选择和内标的应用等实际问题。对XRF在铁矿石分析中的某些重要问题进行了探讨,并对XRF分析铁矿石的应用前景作了展望。文献表明:XRF技术已经成为铁矿石主、次量元素分析最重要的分析方法之一。全篇引文151篇。     

微波消化技术在铁矿石分析中的应用研究

通过微波高压密封法对沉积物样品的消解,采用正交试验设计法系统地研究了微波消解中如试剂种类、压力控制和消解程序等影响因素,确定了最佳消解条件。用微波高压密封法对不同矿源和形态的铁矿石样品进行消解,方法快速、简单,测定结果准确度高,相对标准偏差小于0.15%。本法亦可用于其他矿石样品和环境样品的消解。     

Influence of Chemical Composition on Phase Transformation Temperature and Thermal Expansion Coefficient of Hot Work Die Steel

 On the basis of the uniform design method, six kinds of martensitic hot work die steels were designed. The phase transformation temperatures including Ac1, Ac3, and Ms were measured by DIL805A quenching dilatometer. The influences of the main elements on phase transformation temperatures were analyzed by quadratic stepwise regression analysis, and three corresponding equations were obtained. These equations, in which the interactions of the elements were considered, showed more effectiveness than the traditional ones. In addition, the thermal expansion coefficients of these steels in annealed state and quenched state were also obtained during the tests. The influences of chemical composition and temperature on the thermal expansion coefficient were analyzed; the equations obtained were verified by using several kinds of steels. The predicted values were in accordance with the results of the experiments.     

高温合金中多元素辉光放电质谱法测定及干扰校正

通过辉光放电质谱法(GDMS)测定了高温合金中的C,Mg,Al,P,S,Ti,V,Cr,Mn,Fe,Co,Cu,Nb,Mo,W共15种元素。对辉光放电参数如电流、电压、预溅射时间进行了优化;对高温合金中的质谱干扰进行了分析并详细叙述了各分析元素的干扰情况。选择丰度大且不受干扰或干扰少的同位素用于分析,大多数元素测定结果很好。对于仍存在干扰的元素通过数学校正的方法进行质谱干扰校正。建立干扰校正公式,成功地消除了62Ni2+和36Ar12C+对31P+和48Ti+的质谱干扰。在优化的实验条件下,建立工作曲线。