共查询到17条相似文献,搜索用时 500 毫秒
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针对某大型钢厂热板带轧机上经常性出现的锥套损伤,分析了弹性结合油膜轴承的锥套在装拆过程与使用过程中的主要损伤形式;介绍了弹性结合锥套的装拆过程;针对弹性结合油膜轴承锥套的损伤机制进行了相关定性分析.结果表明:弹性结合油膜轴承锥套的主要损伤形式为划伤与表面磨损和滑移与粘着损伤;造成锥套损伤的主要因素为液压装拆变形、对中效果差和永久变形等. 相似文献
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轧机油膜轴承锥套微动损伤机理和多极边界元法 总被引:1,自引:0,他引:1
为揭示大型轧机油膜轴承等过盈量弹性结合锥套与辊颈粘结事故的产生机理,采用多极边界元法定量描述锥套与辊颈在液压胀形装配过程中的接触应力分布规律,发现锥套与辊颈装配就位时两端区域接触压力高度集中现象,其最大值超过辊颈屈服极限致使辊颈表面生成对应塑性变形的高应力区.通过过盈配合轴套与悬臂轴组成的旋转试验装置,对油膜轴承锥套与辊颈在轧制负荷下进行微动损伤模拟试验,证明辊颈与锥套随着轧辊转动存在相互微动现象,讨论轧制过程中锥套与辊颈两端高接触应力区域微动疲劳损伤导致两者发生粘结的机制.阐明等过盈量弹性结合锥套结构的不合理性,否定原有锥套淬火硬度低而导致粘结事故发生的观点. 相似文献
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在大型轧机油膜轴承与轧辊辊颈的制造及装配过程中 ,为保证轧辊辊颈与油膜轴承锥套的精密配合 ,对轧辊辊颈锥面的精度要求很高。轧辊辊颈尺寸如图 1所示 ,要求锥面大端直径误差小于0 0 8mm ,锥度误差小于 0 0 3mm。为保证辊颈的制造、安装及更换要求 ,必须对辊颈锥度及直径尺寸进行精确测量。由于辊颈锥面尺寸较大 ,无法采用常规的环规测量方法 ,其它直接测量方法也较难实现。本文介绍一种用于检测大型轧辊辊颈锥度及直径尺寸的锥度量规的设计原理及制造方法 ,该量规可在轧辊辊颈加工过程中及最终检验时使用。 1 测量原理量规的基… 相似文献
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根据我国最大规格和最大生产能力的水泥原料立式磨设备中的磨辊结构特点及其工作性能的要求,论述了如何提高装配大型进口轴承、磨辊衬板、大型锥套及大型磨辊支架等关键零件精度的工艺方法。其中包括磨辊衬板的装配尺寸链的计算;装配大型锥度时所需压入力的计算;大型锥套装配后,在弹性变形状态下表面胀径的计算;几何形状特殊的磨辊支架与磨辊轴锥套之间热装尺寸及热装温度的计算。文中的各种理论计算为实践装配提供了精确而又可靠的理论数据,采用本文的装配方法和精确的理论计算有效地提高了大型磨辊装配精度。 相似文献
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轧机油膜轴承是一种理想的滑动轴承,工作时处于纯液体摩擦状态,常用于各种板材轧机、带材轧机及线材轧机轧辊上。锥套是轧机油膜轴承径向承载的主要零件之一,工作时承受巨大的轧制压力,而锥套裂纹是轧机油膜轴承一种比较恶劣的失效形式,容易造成轧机事故。对引起锥套裂纹的原因进行分析,并提出预防措施,减少轧机事故。 相似文献
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冷连轧机相对油膜厚度的测试与建模 总被引:3,自引:0,他引:3
为了分析冷连轧机支撑辊动压油膜轴承的油膜厚度变化对带钢厚度的影响,提高轧机AGC精度,进行了油膜厚度测试实验。对某1450mm五机架冷连轧机进行空压靠,在不同转速和轧制力条件下,记录液压缸缸位移变化值。根据实测数据,建立油膜厚度增量模型,运用Levenberg-Marquardt法拟合出该套轧机的油膜厚度模型参数。实测数据分析表明,油膜厚度随转速增加而增加,并随转速的进一步增加而变化趋势减缓。该研究为轧机厚度方程中油膜厚度补偿量的选取提供了可靠的依据。 相似文献
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HUANG Qingxue LI Yugui College of Material Engineering Taiyuan University of Science Technology Taiyuan China SHEN Guangxian CHEN Zhanfu SHU Xuedao SHI Rong Department of Machinery Yanshan University Qinhuangdao China ZHAO Hongwei CHEN Buquan Hot Mill Plant Baoshan I&S Group Co. Shanghai China 《机械工程学报(英文版)》2006,19(2):246-250
The load distribution of multi-row bearings of large strip rolling mill is fully analyzed by 3D contact boundary element method (BEM). It is found out that bearings are frequently worn out due to serious uneven load on the multi-row rollers. The constraint mechanism of the previous rolling system is found to be unreasonable by theoretical analysis on heavy machinery structure. A mechanism of self-aligning even load for workroll bearing of 2 050 mm hot rolling mill of Baoshan I&S Co. is developed. This device is manufactured with particular regard to the structure of 2 050 mm hot rolling mill mentioned above. Hence, uneven load on multi-row bearings is greatly relieved and their lives are remarkably prolonged. Meanwhile, theoretical analysis and on-spot tests prove the rationality and validity of the device. 相似文献
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Shu XuedaoDepartment of Mechanical Engineering University of Science andTechnology Beijing Beijing ChinaXing XidongDepartment of Mechanical Engineering Shandong University of Technology Zibo China 《机械工程学报(英文版)》2004,17(3):423-426
Aiming at the discontinuous traction on contact elements of roller bearing, new concepts of sub- and micro-element are put forward. In the sub-element and micro-element, traction influence coefficient has been modified, which is calculated by the former boundary element method (BEM) with roller bearing load. Hence, three-dimensional distribution of load on roller bearing is calculated accurately. In practice, it has been proved that this method has higher calculation accuracy. An effective numerical method is offered for analyzing load characteristics of roller bearing to improve service longevity of roller bearing and operation efficiency of rolling mill. 相似文献
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Aluminum sheet ingots go through the hot rolling process to be converted into coils with a gauge suitable for the cold rolling
process or plates. The top spindle, end coupling and slipper metal are main components of the hot roll process and used for
transmission of rotational power with heavy-duty load. The top spindle connected to the motor and end coupling connected to
the roller are combined with the slipper metal which acts as a bearing and joint. The contact surface between end coupling
and slipper metal is subjected to stress concentration, and life cycles of slipper metal is reduced. This study aims to minimize
the mechanical problems which might happen in the production process. The load condition for hot rolling processes is derived
under load condition that is conducted for a hot rolling process under slipper metal combination types and operation situations.
A structural analysis is performed by applying mechanical characteristics, combination type, and rotational boundary condition
of top spindle, end coupling and slipper metal. Optimal design is performed for contact surface between end coupling and slipper
metal. Interference analysis is studied to reduce the stress concentrations. Kinematics simulation is performed by applying
the various combination type and dynamic boundary condition of the mill spindle assembly. The interference does not occur
on the top spindle and slipper metal, so actual driving of the hot mill spindle assembly can operate in the normal operation
condition. 相似文献
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