冷轧带钢轧辊轴承的使用分析

对影响轧辊轴承使用寿命的因素进行了分析,介绍了轧辊轴承的选用原则及提高轴承使用寿命的各项改进措施.实际使用证明,改进后轴承的寿命大幅度提高.     

剖分式滚动轴承在提升机上的分析与应用

针对江铜集团武山铜矿主井多绳摩擦式提升机轴承更换问题,有效对比分析了整体轴承和剖分轴承的优缺点,并阐述了剖分式轴承的更换细节。通过采用剖分式滚动轴承对提升机轴承进行有效改造,改造后,剖分轴承实践使用效果良好,有效地保障了提升机的正常运行。     

轧辊轴承的安装与维护

轧辊轴承的装配、调整和维护质量的好坏，对轴承寿命、产品尺寸精度和轧机作业率有直接影响。用改进后的方法安装和维护轧辊轴承后，轧辊轴承消耗从吨钢11元减少到8元。介绍了轧辊轴承安装和维护的经验。     

Z12V190BJ柴油机主轴承孔修复的探讨与实践

对Z12V190BJ柴油机主轴承孔变形原因进行了探讨,提出了解决方案,制定了主轴承孔和主轴承瓦修复工艺.修复后的柴油机满足了使用性能.     

支撑辊辊颈轴承内圈磨削方法的改进

通过对韶钢中板厂支撑辊轴承烧轴承的原因分析,介绍了新的轴承内圈磨削方法、新的油膜间隙,以及改进后的使用情况。     

热连轧轧机工作辊轴承的润滑及标准优化

热连轧轧机工作辊轴承润滑一般选用抗高温、抗高极压性、抗大水量冲刷及抗冲击负荷的高性能润滑脂,润滑方式多以手动油脂润滑为主。所以,轴承的润滑管理一方面直接影响着轴承的运行状态及寿命,另一方面也决定了运行成本的高低。通过对轧机工作辊轴承润滑情况进行试验跟踪,确定了各轧机、各轴承座的润滑油量,优化了轧辊轴承下线后的润滑制度,既保证了轧辊轴承的正常使用,又大幅度减少了轧辊轴承润滑油消耗量,有效控制了轴承运行成本。     

热带轧机轧辊轴承化改造实践

主要叙述通过对非金属衬开式轴承热带轧机机组的成品架轧机轧辊轴承进行了轴承化改造,从而使改造轴承化后的辊系与胶木瓦轧辊之间具有较好的互换性,并达到了生产多种规格热轧带钢产品的要求。     

热带轧机辊轴承化改造实践

主要叙述通过对非金属衬开式轴承热带轧机机组的成品架轧机轧辊轴承进行了轴承化改造,从而使改造轴承化后的辊系与胶木瓦轧辊之间具有较好的互换性,并达到了生产多种规格热轧带钢产品的要求。     

CSP精轧机组主减速机轴承承载能力分析及优化设计

针对某钢厂CSP(Compact Strip Production)产线精轧机组主减速机轴承频繁失效问题,在获取减速机力能参数基础上,结合精轧机监测系统数据,采用有限元仿真对轴承应力水平进行分析,获得轴承及保持架应力谱,再采用疲劳累积损伤理论对轴承使用寿命进行分析,得出轴承保持架疲劳破坏是轴承失效的主要原因.因此,对轴承结构形式进行了优化,将原轴承更换为穿销孔轴承,重新进行疲劳寿命评估,发现改进后的轴承保持架的疲劳寿命很长,产生损坏的机率极少,可从根本上解决轴承故障问题.     

Φ500mm轧机机列主传动飞轮轴承座滚动轴承发热分析

对Φ５０ｍｍ轧机机列主传动飞轮轴承座双列向心球面滚子轴承发热原因进行分析，发现双列向心球面滚子轴承在同一轴承座内成对布置时，削弱了其调心功能，对轴承动负荷进行简单计算后，将飞轮两轴承座内轴承去掉一盘，试运转２ｈ后，轴承温度基本停止上升。     

Evaluation of Laminated Circular Elastomeric Bearings

This paper evaluates the behavior and performance of laminated circular elastomeric bearings and compares them to those of square and rectangular bearings. The study included an experimental evaluation and a nationwide survey of state Department of Transportations on the use and performance of circular bearings and bearings in general in their states. The experimental investigation studied the bearings' behavior in compression, compression and rotation, and compression and shear. Results from this limited study showed that the three bearings have similar stress-strain behavior in compression and they are in agreement with the AASHTO LRFD guide stress–strain curves. In compression and rotation, the AASHTO LRFD substructure moments are slightly less than the measured values for circular bearings and rectangular bearings rotated about their strong axis for a compressive stress of 10.3?MPa (1.5?ksi) and slightly higher than those of rectangular bearings rotated about their weak axis. In compression and shear, the shear stiffness of circular and square bearings is in agreement with theoretical values within the range of design displacements. Results from the survey showed that many states are using circular bearings and more states would consider using them, however no maintenance or monitoring data were available on their short-term and long-term performance.     

含轴油承用作磨床主轴前轴承的运转试验

为提高磨床砂轮主轴的旋转精度以及改进轴承结构,杭州机床厂将原来使用的动压轴承改成预载荷弹性变形含油轴承并取得初步成效。根据对新轴承所进行的300多小时运转试验,测得摩擦系数为0.02-0.05,温升为20℃左右,其值介于一般的流体动压轴承和铁基含油轴承之间;磨损量为10μm左右;主轴启动扭矩约为动压轴承的两倍。试验还表明,保证充分供油和把磨削力控制在额定范围以内是保证弹性变形含油轴承正常运转的两个重要条件。     

Seismic Response of Multiple Span Steel Bridges in Central and Southeastern United States. II: Retrofitted

Part I of this two-part paper evaluated the seismic response of typical multispan simply supported (MSSS) and multispan continuous steel girder bridges in the central and southeastern United States. The results showed that the bridges were vulnerable to damage resulting from impact between decks, and large ductility demands on nonductile columns. Furthermore, fixed and expansion bearings were likely to fail during strong ground motion. In this paper, several retrofit measures to improve the seismic performance of typical multispan simply supported and multispan continuous steel girder bridges are evaluated, including the use of elastomeric bearings, lead-rubber bearings, and restrainer cables. It is determined that lead-rubber bearings are the most effective retrofit measure for reducing the seismic vulnerability of typical bridges. While isolation provided by elastomeric bearings limits the forces into the columns, the added flexibility results in pounding between decks in the MSSS steel girder bridges. Restrainer cables, which are becoming a common retrofit measure, are effective in reducing the hinge opening in MSSS bridges with steel bearings. However, when used with elastomeric bearings, the restrainer cables negate the isolation effect of the bearings.     

粉末冶金轴承材料和制品

本文对热锻圆锥滚子轴承、金属陶瓷轴承、自润滑保持架材料、球面滚子轴承中隔圈材料和喷涂PbO固体润滑剂硬质合金球等五种粉末冶金制品和材料作简要介绍。     

粉末冶金皮辊轴承外圈

皮辊轴承是精纺机、粗纺机重要易损零件之一,使用面广、量大,每年消耗以百万计。其使用条件属于无沟道点接触滚动摩擦,带有滑动摩擦的性质,与其他纺机专用滚动轴承相比有更为苛刻的耐磨损要求。因此皮辊轴承的研制对于用粉末冶金制造纺机专用轴承具有一定的代表性。
本文论述了粉末冶金制件的冷热加工的工艺性;通过金相组织和电镜扫描分析,探讨了其耐磨机理。通过五年零十个月的纺纱实践,在同样条件下与轴承钢制件作对比,其磨损量大幅度下降,使用寿命延长2倍以上。而且,无论在工时、材料利用率、降低成本等方面均较轴承钢制件优越。     

烧结含油轴承

烧结含油轴承的金属结构中含有众多的相互连通的开孔，轴承中的孔隙容积约为10％－40％。这个孔隙容只可用来贮存流体润滑剂，流体润滑剂是在轴承的制造过程中含浸于其中的，在大多数应用中，是由轴承自身含的润滑剂进行润滑的。这份报告介绍了烧结含油轴承的概况和著者在烧结含油轴承方面近50年研究经历，并对烧结含油轴承的改进提出了一些建议。     

谈轴承热处理的质量和新技术的研发

根据轴承的结构特点和对轴承用钢热处理的基本要求,本文介绍了轴承零部件的热处理技术、轴承热处理的质量缺陷及其工艺改进措施。     

Tribological and mechanical properties of PM journal bearings

Abstract

Powder materials are widely used in journal bearings since they provide a good tribological performance with journal bearings. These bearings are self-lubricated and can be used in places where no lubricating is possible. In this study, tribological and mechanical properties of copper based CuSn10, ferrous based Fe–graphite and copper+ferrous based CuSnFe–graphite bearings manufactured by powder metallurgy method have been determined and compared. Wear tests were carried out at 20 N load and 1500 rev min^?1 every 30 min for 2·5 h using radial journal bearing wear test rig. Hardness, tensile, compressive, bending and radial fracture mechanical tests of these bearing materials were carried out. As a result, tribological and mechanical properties improved in CuSnFe–C bearings.     

Shelf life and in vivo duration. Impacts on performance of tibial bearings

Polyethylene has been used for more than 30 years as an orthopaedic bearing material; however, recently concern has been focused on the early failure of some polyethylene bearings. The damage seen in some bearings has been linked to gamma radiation sterilization performed in an air environment. Gamma sterilization in air has been documented to cause an increase in oxidation and degradation of mechanical properties that continue with time. However, not all retrieved bearings that are gamma sterilized in air exhibit the elevated oxidation and mechanical property degradation that lead to early component failure. Bearings that are gamma sterilized in air oxidize while sitting in inventory before implantation. Shelf oxidation rate was estimated based on analysis of a series of never implanted tibial bearings. This shelf oxidation rate allowed estimation of in vivo oxidation for retrieved tibial bearings of known sterilization date. Bearings with less than 1 year of shelf life after gamma sterilization in air had lower in vivo oxidation and better in vivo performance than did those with longer shelf life before implantation. Shelf time before implantation appears to be a significant factor in the success or failure of bearings that are gamma sterilized in air.     

球磨机无燃瓦条件分析及应用

以某厂的球磨机为实例,球棒磨机的液体滑动轴承性能进行综合计算,并对液体滑动轴承性能参数进行有效的分析。针对球磨机滑动轴瓦油膜的形成条件逐步分析和研究,结合实际运行情况制定组装工序加以应用,避免了燃瓦故障,创造了很好的效益。