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调心滚子轴承使用寿命配合装配因素

日期:2019-05-12 15:16 作者:ina 阅读:
轴承使用因素主要是指安装调整、使用保养、维护修理等是否符合技术要求。根据日本nsk轴承安装、使用、维护、保养的技术要求,对运转中的调心滚子轴承所承受的载荷、转速、工作温度、振动、噪声和润滑条件进行监控和检查,发现异常立即查找原因,进行调整,使其恢复正常。安装条件是使用因素中的首要因素之一,轴承往往因安装不合适而导致整套轴承各零件之间的受力状态发生变化,轴承在不正常的状态下运转并提早结束使用寿命内在因素主要是指结构设计、制造工艺和材料质量等决定轴承质量的三大因素。
1、轴承游隙的选择:用户在购买轴承时一般只会告知在什么型号、等级,很少会对轴承的游隙提出要求,业务人员必须问清INA轴承的使用条件、其中调心滚子轴承的转速、温度、配合公差都直接关系到轴承游隙的选择。一般在3500转/分以下转速的电机大多采用CM游隙,如高温高速电机则要求采用相对较大的游隙。轴承游隙在装配后会因为内孔的涨大及外圆的缩小而导致减少,游隙的减少量=过盈量×60%(轴承室是铝的除外)。比如轴承装配前游隙是0.01mm,装配时过盈量为0.01mm,则轴承装配后的游隙为0.004mm。在理论上轴承在零游隙时噪音和寿命都达到最佳的状态,但在实际运转中考虑到温升等问题,轴承在装配后游隙为0.002mm-0.004mm较好。
2、油脂的选择:油脂的选择一般是根据调心滚子轴承的转速、耐温情况、噪音要求及起动力矩等方面进行选择,要求业务人员对各种油脂的性能很了解。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。
3、轴承型号的选择:轴承型号一般是由用户的技术人员根据配套产品的使用条件及承受负荷对INA轴承进行选择。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。nsk轴承代理商可分为:滚轮直线导轨,圆柱直线导轨,滚珠直线导轨,三种,是用来支撑和引导运动部件,按给定的方向做往复直线运动。业务人员主要了解用户的实际负荷是否与所选轴承相符合,如果圆柱滚子轴承达不到使用要求,应尽快建议客户改选型号,但除非特殊产品在选择型号上一般不会有什么问题。 
4、轴承密封型式的选择:调心滚子轴承的润滑可分为油润滑和润滑脂。油润滑轴承一般是选用形式轴承,脂润滑INA轴承一般选用防尘盖或橡胶密封件密封。防尘盖适用于高温或使用环境好的部位,密封件分接触式密封和非接触式密封两种,接触式密封防尘性能好但起动力矩大,非接式密封起动力矩小,但密封性能没有接触式好。
轴承材料的冶金质量曾经是影响滚动轴承早期失效的主要因素。随着冶金技术(例如轴承钢的真空脱气等)的进步,原材料质量得到改善。原材料质量因素在调心滚子轴承失效分析中所占的比重已经明显下降,但它仍然是SUNTHAI轴承失效的主要影响因素之一。选材是否得当仍然是轴承失效分析必须考虑的因素。
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