Fe、V对电工圆铝杆导电性能的影响

控制电工圆铝杆的电阻率一直是生产厂家首要任务,而电工圆铝杆电阻率受Fe、Si、V及其他微量元素的影响非常明显。本文研究了工业纯铝中Fe、V等杂质对电工圆铝杆电阻率性能的影响。结果表明:电工圆铝杆电阻率随着Fe、V含量的增加而逐渐增大;当其他元素含量不变时,Fe/Si比在3.75~4.75时可以获得符合国标(GB/T3954-2014)的A6电工圆铝杆。     

电工圆铝杆生产线中连铸机存在的问题及改进

摘要：介绍φ1500mmY型连铸连轧电工圆铝杆生产线中连铸机存在的问题和所采取的改进措施，并进行实践．效果良好。     

圆铝杆连轧过程中前滑现象的理论研究

介绍了电工圆铝杆连续轧制过程中稳定轧制条件及前滑现象的产生，通过理论分析，给出前滑值的计算方法，并指出了影响前滑的主要因素。     

φ9.5mm电工圆铝杆连铸连轧机组的改造

一、存在问题 我厂用于生产φ9.5mm电工圆铝杆的连铸连轧机组,自1986年投产至今,经常出现故障.存在问题如下.     

用于锅炉烟管更换的拉马式铰刀

一、存在问题我厂用于生产９．５mm电工圆铝杆的连铸连轧机组，自１９８６年投产至今，经常出现故障。存在问题如下。１．由于无炉外精炼设备，从混合炉流出的未经处理的铝液经流槽直接进入连铸机，导致产出的圆铝杆内部杂质多、质量差。２．由于连铸机铸出的坯料直接送入连轧机，那些截面不符合要求的坯料进入连轧机后引发问题，导致经常停机处理。３．由于连轧机是由１３副Y型三辊机架组成，轧辊数量少，导致产品表面质量差，内部组织不均匀，成品率低。二、改造方案采用炉外精炼、炉内除气的办法对熔态铝进行精炼，增加连铸机、油压剪…     

电工圆铝杆连铸结晶轮的壁厚优化设计

结晶轮在电工圆铝杆生产中起着梯形锭成型和保证生产条件的重要作用,其使用寿命成为制约生产的瓶颈。应用有限元方法模拟结晶轮的温度场,由热力耦合分析,确定热应力是影响结晶轮使用寿命的重要因素。基于热力耦合分析结果,从优化设计原理和方法入手,应用ANSYS DX优化工具,对结晶轮壁厚进行的优化设计。结果表明,结晶轮能够满足性能要求,优化效果明显,为提高结晶轮使用寿命提供了有效方法,也为类似结构的参数优化设计进行了尝试。     

L245NB+316L小管径复合钢管焊接工艺研究

本文详细分析不锈钢复合材料的弹接性，描述1245NB＋316L小管径不锈钢复合管焊接接头的坡口形式，并通过焊接工艺评定确定焊接参数。该工艺通过在吉林长岭一号气田工艺管线安装中的应用，获得了满意的焊接质量，满足了设计与标准规范的要求，为公司今后的技术发展积累了一定的经验。     

铝杆连铸机结晶轮滚压过程的有限元仿真与分析

介绍了φ9.5 mm电工圆铝杆连铸连轧生产线设备中连续铸造结晶轮制造工艺,应用滚压工艺技术,提高结晶轮的耐磨性、抗疲劳强度和使用寿命。通过对滚压技术研究和结晶轮结构分析,采用Pro/E软件实体建模、ANSYS11.0有限元软件和接触分析技术,对滚压过程进行仿真,对结晶轮应力分布和变形情况进行分析,确定了所需的滚压力,并在模拟的基础上进行实践验证。模拟结果和实践数据基本吻合,对自制滚压机的设计、滚压工艺制度的制定有着积极的意义。     

复合L形宽频压电悬臂梁的建模与仿真

为提高单频压电悬臂梁的振动能量采集转换效率,提出一种复合L形压电悬臂梁的宽频拓展技术,通过在单频压电悬臂梁水平结构中增加一个辅助垂直悬臂梁,组成L形压电悬臂梁,通过控制L形压电悬臂梁的结构和材料参数使悬臂梁的2阶模态频率为1阶模态频率的2倍,将1阶、2阶模态频率串联起来形成一个宽频的谐振带。利用拉格朗日方程和模态假设法建立了L形压电悬臂梁的频率方程和振动方程,通过数值仿真分析了L形压电悬臂梁结构和材料参数对其频率特性和振动特性的影响,并确定了系统的最佳结构和材料参数,实例验证了悬臂梁宽频拓展方法的正确性。     

超级奥氏体SA904L焊接及应用

某公司为吉林奇峰经纤有限公司年产4万t差别化腈纶技术改造项目承制了一台醋酸去除塔再沸器，该设备的使用介质腐蚀性比较强，为此在设计上选用了904L不锈钢，本文经焊接性分析后，从焊接材料，焊接参数的选择入手，进行了焊接工艺性试验，找出了合适的焊接规范；并在实际产品的焊接中进行了严格的质量控制，使该产品顺利产成。     

Tribological performance of an ionic liquid as a lubricant for steel/aluminium contacts

The wear and friction behaviour of an ionic liquid 1‐ethyl‐3‐hexylimidazolium tetrafluoroborate (L206) was investigated as a lubricant for steel/aluminium contacts using an Optimol SRV® oscillating friction and wear tester. The elemental composition and chemical nature of the antiwear films generated on the aluminium surface were analysed using a scanning electron microscope with a Kevex energy dispersive X‐ray analyser attachment (SEM/EDS) and X‐ray photoelectron spectroscopy (XPS). A low friction coefficient (˜0.05) was recorded when lubricating with L206; a small amount of water (5 wt. %) in L206 effectively reduced the wear volume and greatly increased the microhardness of the aluminium alloy, but had little effect on the friction coefficient. The SEM/EDS results showed that severe corrosive wear occurred on the aluminium alloy when lubricating with neat L206, which could be avoided by the addition of water in L206. The XPS results indicated that the species AlF₃, Al₂O₃, AlO(OH), and Al(OH)₃ formed during friction; there was no indication of boron on the worn surfaces.     

The relative importance of multiple inelastic scattering in the quantification of EELS

A comparison is given of energy loss results obtained for the L and K edges of aluminium as a function of specimen thickness, crystallographic orientation and collection angle. It is demonstrated that as the thickness is increased post-loss elastic scattering is generally important in reducing the fraction of electrons collected. The implications for the quantification of EELS data are discussed while a comparison of the Fe/C ratio in cementite demonstrates the improved consistency which can be obtained when comparing K and L losses at lower energy separation than are the losses for aluminium.     

Spring-back and metal flow in forming shallow dishes by explosives

Disks of the aluminium alloys DTD.687 and HS.10, in the fully heat-treated condition, have been formed into a shallow spheroidal-section cavity in a steel die using water to transmit the shock pulse.

The main conclusion is that when large charges are employed, a movement of metal takes place towards the centre (the pole position), giving a progressive increase in thickness, or buckling if the metal is of thin gauge. This effect is attributed to the high pressure produced by the impact of the specimen on the die, the line of contact with the die being initially an annular ring which then sweeps towards the centre of the specimen.

With the minimum charge necessary to form the dish, the metal becomes progressively thinner on approaching the centre, as would be expected from published experimental and theoretical work on free-forming (without a die).

Graphs showing spring-back from the die plotted against distance from the pole position exhibit several features which can be qualitatively explained by the changes in metal flow with increasing charge weight. With the minimum charge to ensure complete contact with the die, the spring-back of the DTD.687 alloy at the pole position was≈0·1 in., compared with a calculated value of 0·048 in. for slow-speed expansion by hydrostatic pressure. Moderate increases in the charge weight reduced the spring-back.     

电极形状对铝-钢点焊接头组织及力学性能的影响*

研究6061-T6铝合金-SUS301L不锈钢异种金属电阻点焊接头的微观组织特点及电极形状的影响规律。结果表明,铝-钢点焊接头具有熔-钎焊特征,铝合金熔核由α-Al胞状晶、胞状树枝晶和树枝晶组成,铝/钢界面层具有双层结构,靠近铝熔核侧主要为细针状Fe₄Al₁₃,靠近不锈钢侧主要为Fe₂Al₅金属间化合物,接头主要为界面断裂模式,铝/钢界面是点焊接头最薄弱的区域。电极形状对铝合金-不锈钢点焊接头具有明显的影响。获得的优化电极形状为：不锈钢侧为圆形平面电极,电极端面直径为10 mm;铝合金侧为球面电极,球面半径为35 mm。在优化电极条件下,铝合金-不锈钢点焊接头的熔核直径、拉剪力及压痕率分别为7.5 mm、4.7 kN和13.5%。与采用F型电极相比,其熔核直径和拉剪力分别提高53.1%和56.7%,压痕率降低47.3%。因此,采用优化电极更有利于改善铝合金-不锈钢电阻点焊接头的力学性能及表面质量。     

Simulation of electron energy loss near-edge structure at the Al and N K edges and Al L(23) edge in cubic aluminium nitride

Calculations of electron energy near edge structures (ELNES) are compared with experimental data obtained in a high-resolution transmission electron microscope. This study concerns small precipitates of aluminium nitride in low carbon steel. The ELNES technique allows to clearly establish that these precipitates crystallize in a cubic rather than in a hexagonal crystallographic cell. The influence on simulated spectra of different parameters are investigated: the size of the atomic shell and its relation with the electron inelastic mean free path. We also examine the influence of the core hole and the sensitivity to cell parameters. We particularly examine the Al L(23) near edge structure and features relating to the different transition channels (A(1g), E(g) and T(2g)). Results of a multiple scattering and band structure calculations using ICXANES and WIEN97 codes, respectively, are compared in the region from 0 to 30 eV above the edge onsets. Both calculations are in a rather good agreement.     

极齿关键参数对磁流体密封热特性影响的试验研究*

为探讨磁流体密封极齿参数对磁流体热特性的影响,利用传热学理论构建磁流体密封装置的传热计算模型,研究不同转速下密封间隙、极齿宽度、极齿槽宽度和极齿高度与磁流体温度的关系。在磁流体密封实验台上研究密封间隙、极齿宽度、极齿槽宽度和极齿高度对磁流体温度的影响,并利用模型计算结果对试验结果进行了验证。试验结果表明:随着密封间隙和极齿高度的增加,磁流体温度逐渐减小,呈负指数变化趋势;随着极齿宽度的增加,磁流体温度线性增加;随着极齿槽宽度的增加,磁流体的温度基本不变;密封间隙对磁流体温度影响最大,其次是极齿宽度和极齿高度,极齿槽宽度对磁流体温度基本没有影响。研究表明,在一定范围内适当增加密封间隙和极齿高度,适当减小极齿宽度,可以在一定程度上减小磁流体的发热量,提高磁流体密封装置寿命。     

原子激光同位素分离的离子引出技术

介绍了离子引出的几种方法 ,包括平行板电极法、交替偏压平行板电极法、线状阳极对称电极法、Π 状电极法、M状电极法、射频共振法等 ,并对这些技术进行了简要的评述。重点介绍了射频共振引出的理论模型和模拟实验方法。选择合适的离子引出参数 ,射频共振法比平行板电极法的离子引出效果更好     

电杆养护窑的设计要点

电杆养护是电杆生产过程的关键工序,而电杆的养护窑设计非常重要,本文从电杆养护窑的结构设计及PLC自动控制设计出发论述电杆养护窑的设计关键。     

水轮机主轴磁流体密封间隙流场关键参数研究

水轮机主轴磁流体密封装置间隙流场因工况和物理场的复杂性一直是磁流体密封研究难点。为研究水轮机主轴磁流体密封装置间隙内磁流体流动特性,建立主轴密封间隙流场数值模型并通过试验进行了验证;通过数值计算研究密封间隙、极齿宽度、极齿高度和极齿槽宽度对磁流体流动的影响。结果表明：极齿附近磁流体不受结构参数影响,基本保持不动;当密封间隙小于0.6 mm时,间隙内磁流体基本不发生流动,当密封间隙超过该值后,极齿槽和永磁体附近磁流体随间隙增加流动加剧,速度线性递增;极齿槽和永磁体附近磁流体随极齿宽度递增流动减弱,速度先线性递减,在3.0~3.5 mm极齿宽度时急剧减小,最后趋于稳定;随着极齿高度和极齿槽宽度逐渐增加,极齿槽和永磁体附近磁流体流动会减弱,极齿槽附近磁流体速度在极齿高度为1.0~3.5 mm和极齿槽宽为3.0~12 mm速度急剧减小,最后趋于稳定,而永磁体附近磁流体速度一直呈线性递减。     

极点配置不同算法的比较

极点配置是线性系统综合中的重要问题,尤其是SISO系统的极点配置问题尤为重要,很大程度上促进着MIMO系统极点配置问题的解决。通过不同算法的比较,介绍了一种更简洁地计算SISO系统的MIMO系统的极点配置方法,以使相对通用极点配置算法进一步完善。