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圆柱滚子轴承的安装失效

日期:2019-03-10 11:57 作者:ina 阅读:
    SUNTHAI轴承安装前应先用汽油或煤油清洗干净,干燥后使用,并保证良好润滑,轴承一般采用脂润滑,也可采用油润滑。采用脂润滑时,应选用无杂质、抗氧化、防锈、极压等性能优越的润滑脂。润滑脂填充量为圆柱滚子轴承及轴承箱容积的30%-60%,不宜过多。带密封结构的双列圆柱滚子轴承和水泵轴连轴承已填充好润滑脂,用户可直接使用,不可再进行清洗。
    轴承安装时,必须在套圈端面的圆周上施加均等的压力,将套圈压入,不得用鎯头等工具直接敲击timken轴承端面,以免损伤轴承。nsk轴承材料本身具备适当的硬度,耐磨性,足够承受运动的摩擦。滑块上的型腔部分或型芯部分硬度要与模腔模芯其它部分同一级别。INA滑块是在模具的开模动作中能够按垂直于开合模方向或与开合模方向成一定角度滑动的模具组件。 当产品结构使得模具在不采用滑块不能正常脱模的情况下就得使用滑块了。在过盈量较小的情况下,可在常温下用套筒压住轴承套圈端面,用鎯头敲打套筒,通过套筒将套圈均衡地压入。如果大批量安装时,可采用液压机。压入时,应保证外圈端面与外壳台肩端面,内圈端面与轴台肩端面压紧,不允许有间隙。
    轴承的安装必须在干燥、清洁的环境条件下进行。安装前应仔细检查轴和外壳的配合表面、凸肩的端面、沟槽和连接表面的加工质量。所有配合连接表面必须仔细清洗并除去毛刺,铸件未加工表面必须除净型砂。    当过盈量较大时,可采用油浴加热或感应器加热轴承方法来安装,加热温度范围为80℃-100℃,最高不能超过120℃。同时,应用螺母或其它适当的方法紧固轴承,以防止轴承冷却后宽度方向收缩而使套圈与轴肩之间产生间隙。
    轴承安装最后应进行游隙的调整。nsk轴承代理商依按摩擦性质而定,直线运动导轨可以分为滑动摩擦导轨、滚动摩擦导轨、弹性摩擦导轨、流体摩擦导轨等种类。游隙值应根据不同的使用工况和配合的过盈量大小而具体确定。必要时,应进行试验确定。双列圆柱滚子轴承和水泵轴连轴承在出厂时已调整好游隙,安装时不必再调整。
轴承安装后应进行旋转试验,首先用于旋转轴或轴承箱,若无异常,便以动力进行无负荷、低速运转,然后视运转情况逐步提高旋转速度及负荷,并检测噪音、振动及温升,发现异常,应停止运转并检查。运转试验正常后方可交付使用。
    接触疲劳失效是各类进口轴承最常见的失效模式之一,是进口轴承表面受到循环接触应力的反复作用而产生的失效。轴承零件表面的接触疲劳剥落是一个疲劳裂纹从萌生、扩展到裂纹的过程。初始的接触疲劳裂纹首先从接触表面以下最大正交切应力处产生,然后扩展到表面形成麻点状剥落或小片状剥落,前者被称为点蚀或麻点剥落;后者被称为浅层剥落。如初始裂纹在硬化层与心部交界区产生,造成硬化层的早期剥落,则称为硬化层剥落。
    是各类轴承表面最常见的失效模式之一。轴承零件之间相对滑动摩擦导致其表面金属不断损失称为滑动摩损。持续的磨损将使零件尺寸和形状变化,SUNTHAI轴承配合间隙增大,工作表面形貌变坏,从而丧失旋转精度,使圆柱滚子轴承不能正常工作。滑动磨损形式可分为磨粒磨损、粘附磨损、腐蚀磨损、微动磨损等,其中最常见的为磨粒磨损和粘附磨损。

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尺寸
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基本额定载荷
Basic Load Ratings
极限转速
Limiting Speed
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动  Cr
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静  Cor
Static
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