2050mm热轧机组R2主传动接轴铜滑块的磨损分析

对２０５０ｍｍ热轧机组Ｒ２主传动接轴铜滑块的磨损问题进行了分析，选择合适的材料、维护边界膜不受破坏以及采取有效的润滑方式是提高铜滑块承载能力和延长铜滑块使用寿命的关键。     

一种轧机万向联轴节铜滑块的热处理方法

一种轧机万向联轴节铜滑块的热处理方法专利号：ＺＬ９０１０２９９１．２发明人：范松年专利权人：宝山钢铁（集团）公司套筒滑块式万向联轴节在轧机上被广泛采用，由于其传递的扭矩大，铜滑块相应应力高，尤其是当传动系统存在扭矩时，使铜滑块表面应力更高，铜滑块磨损...     

轧钢机万向接轴滑块新结构设计及试验分析

滑块式万向接轴滑块磨损较快,浪费了大量青铜,为了提高滑块寿命和节约青铜,有用尼龙6作为替代材料的,但尼龙有吸水性大,尺寸稳定性差,热传导系数小等缺点。本文提出了一种滑块新结构,试图改善滑块的磨损和降低成本,并作了初步的试验分析。     

初轧机万向接轴铜滑块的润滑

多年来,太钢初轧厂对轧机的万向接轴铜滑块的润滑方式作过多次改进,最终取得了较好的效果。铜滑块的使用寿命由原来的一、两个月提高到一年以上。 一、改进前的状况 太钢1000初轧机是1958年引进的设备。其万向接轴的扁头与铜滑块的润滑采用稀油随机润滑,事先将稀油注入关节头部的储油池内,该储油池在连杆头部焊接而成。随着连接轴的旋转,储油池油位发生变化,润滑机通过接轴虎口上和铜滑块上的油孔流入滑块的工作表面。实践证明,这种给油方式是极不可靠的。从而被迫改进人工向滑块上定期浇     

热镀锌DC54钢板耦合变形的摩擦行为

采用自行研制的耦合变形的摩擦试验机,研究了热镀锌DC54钢带与淬回火处理的DC53冷作模具钢对偶滑块在耦合变形条件下的摩擦磨损行为,并用有限元分析了耦合变形的摩擦条件下钢带沿厚向和摩擦面的应力分布.结果表明,在耦合变形的摩擦条件下,塑性变形是影响钢带摩擦行为的主要因素,随载荷的增加,镀锌钢带与滑块间的摩擦因数增大,磨损越剧烈.     

往复泵偏置曲柄机构的受力分析

目前我国生产的往复泵,通常采用正置曲柄滑块机构,在正、反行程中滑块所受正压力方向相同,且有峰值(图1、2)。因此,滑块和滑座受力过大,摩擦功不均,易造成不均匀的磨损和发热现象。     

铜含量对铁基粉末冶金航空刹车材料摩擦磨损性能的影响

讨论了大范围内铜含量(0～30％,质量分数)对铁基粉末冶金航空刹车材料摩擦磨损性能的影响和材料的摩擦磨损机理,结果表明:不合铜时,材料的摩擦因数和磨损量均较大,磨损机理主要为粘着磨损;添加铜后,材料的摩擦因数和磨损量均有所下降,疲劳磨损为主要机理;当铜含量升高到有大量游离铜存在时,材料的摩擦因数和磨损量逐渐增加,磨损机理又主要体现为粘着磨损。     

铜阴极始极片钉耳机的设计与改造

介绍铜电解始极片钉耳机的设计方法，阐述了偏心轮双滑块机构的设计原理，以及该机构的结构特征。简单分析了偏心轮双滑块机构在冲压设备上运用的可行性，为以偏心轮单滑块机构作为经典设计的常用冲压设备的设计提供了新的设计思路。     

热板精轧机接轴滑块磨损原因分析及改进

对攀钢１４５０热轧板厂精轧机Ｆ１～Ｆ３主传动同滑块过快磨损的原因进行了分析，并提出了改进措施。     

特钢加热炉钢坯黑印的控制与研究

介绍了特铜大型轧钢车间加热炉钢坯黑印形成的原因和几点改进建议,以及加热炉滑块的研究现状分析及发展方向。     

中板轧机滑板间隙对板形控制影响的初步探讨

中板轧机滑板的有效间隙具有承载和导向作用。滑板间隙偏差将导致轧制不稳定,影响板形质量,并使设备受损。为保持有效间隙,应减少支撑辊轴承座滑板与轧机滑板的磨损,提高滑板的利用率。     

孔洞式全热滑轨技术在500机组加热炉上的应用

介绍了新冶钢500机组蓄热加热炉炉筋滑轨存在的问题以及新型的孔洞式热滑轨技术.重点介绍了采用新技术进行改造后所取得的明显效果和预期收益,证明孔洞式热滑轨技术是一项实用有效的新型节能技术.     

考虑滑道摩擦时飞剪机动力学分析的一种新方法

提出了一种新的方法解决了考虑滑道摩擦情况下飞剪机构的动力学分析问题。该方法首先通过相对速度和加速度判定摩擦力的方向,然后对每一给定位置通过四次求解方程组,最终确定出其中的一组正确解。该方法从理论上解决了此类问题的解析求解问题,对实际机构的强度设计、各铰链滚动轴承的选择、滑道材料的选择以及驱动电机功率的选择都有指导意义。     

Cell block preparation of a Burkitt's lymphoma cell line as a positive control for in situ hybridization for Epstein-Barr virus

OBJECTIVE: To examine the feasibility of the use of a cell block preparation of Epstein-Barr virus (EBV)-infected Burkitt's lymphoma cell line (EB-3) as a positive control for in situ hybridization (ISH) for EBV-encoded RNA (EBER). STUDY DESIGN: EB-3 cells were processed into cell block and cytocentrifuge preparations. ISH for EBER was performed, and the results were compared with a commercially available EBV positive control slide (cytocentrifuge). RESULTS: The cost of preparing the cell block and cytocentrifuge sample was only a fraction of the price of commercial control slides. ISH for EBER was strongly stained in all preparations with similar intensity of staining but with a much higher number of positive cells in the cell block. Although the cellular details in the cell block were considerably inferior to those on the cytocentrifuge and commercial control slide, with distortion of nuclei and smudging of chromatin, the interpretation of the ISH results was unaffected. The cell block was stable at room temperature when examined after one year. CONCLUSION: The cell block preparation of an EBV-infected Burkitt's lymphoma cell line serves as a reliable, stable and a relatively inexpensive control, with good preservation of cellular details of cellular RNA for ISH study for EBER in the detection of latent infection with EBV.     

四辊中厚板轧机万向接轴润滑方案初探

分析了四辊中厚板轧机万向接轴的润滑情况,对接轴铜滑块的几种润滑方式作了探讨,介绍了一种润滑效果较好的干油自动润滑装置。     

基于COMSOL铝电解电流分布在线监测的磁场分析

通过测量铝电解槽阳极电流产生的磁场来反映电流,并且使用屏蔽磁环屏蔽掉邻近的阳极、立柱母线、水平母线和跨接母线产生的干扰磁场。最后通过试验和COMSOL仿真,验证屏蔽磁环的可行性,实现电流分布连续监测。该测量方法简单,测量结果精确。     

推钢式加热炉热滑道改造

莱钢轧钢厂带钢车间推钢式加热炉采用侧插式燕尾形结构热滑道代替原结构，经合理确定其结构尺寸，解决了原焊块在使用过程中的开焊问题，减小了钢坯的水管黑印，提高了钢坯加热质量，月平均减少４ｄ停炉维修时间。     

冀西北地区铜地球化学块体特征及资源潜力预测

以冀西北地区１∶２０万化探扫面资料为基础,应用地球化学块体理论与方法,对研究区内铜的地球化学块体特征和铜矿产资源特征进行了系统分析。共圈出3个规模不等的铜地球化学块体和3处地球化学异常,重点分析研究程度较高的3号铜地球化学块体,通过结合遥感线、环构造特征和区域蚀变遥感异常带对3号铜化学矿体进行耦合验证,优选找矿地球化学块体,认为3号铜化学矿体内涞源县湖海铜地球化学异常区具有进一步找矿潜力。     

Controlling factors in the development of ceruloplasmin in pigs during the neonatal growth period

The sequence of ceruloplasmin development and limiting factors controlling this process in neonatal piglets was studied in a randomized block design. Guided by the change in serum ceruloplasmin levels, the liver copper concentrations of piglets fed copper-deficient and copper-supplemented diets were compared in three different periods. The plasma of piglets was devoid of both apo- and holo-ceruloplasmin at birth. The system responsible for the synthesis of apoceruloplasmin developed shortly after birth as indicated by a steady increase in serum ceruloplasmin activity during the first week without being affected by the diet. Copper apparently was not the limiting factor at this stage since very high concentrations of copper were found in the livers of newborn piglets. However, the liver copper was depleted quickly within 1 to 2 weeks and became the limiting factor if the diet was deficient in copper. The livers of these piglets were fractionated by differential centrifugation to compare the liver copper distribution in the two dietary groups with and without copper supplementation. The treatments did not affect the copper distribution on a percentage of total liver copper basis. However, fractionation study revealed that, unlike adult pig livers, about 70% to 80% of copper was present in the heavier particle fractions of piglet livers.     

An Approach for Estimation of Cathode Voltage Drop in an Aluminum Reduction Cell with an Inclined Carbon Block and a Copper Insert

Numerical models of a cathode block assembly in a Hall–Hèroult cell, comprising of liquid aluminium, carbon block, current collector, ramming paste and a copper insert were built and the finite element method simulations were carried out to model the cathode voltage drop (CVD), the current distribution and, the effect of geometrical parameters on the CVD. The objective of the study was to quantify the drop in the CVD for different cathode assembly design. Flat- and inclined-interface carbon block top-surface and a copper insert versus the conventional insert-free designs were simulated with a myriad of other geometrical parameters to optimise the design. The results informed about the optimum insert positioning to about 75 mm from the collector base and the energy saving possibilities due to reduction in the CVD with a cathode design with inclined-interface carbon block and copper insert in the collector bar.