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轴承保持架材料对轴承运转的影响

来源:龙道轴承 发布时间:2019-03-31热度:
(1)对保持架材料的常规要求 1)具有低的硬度和高的耐磨性,虽然硬度高的材料耐磨性都较高,但如用高硬度材料作保持架,会磨损滚动体,给旋转性能带来不良影响,甚至产生 ;抱合现...

  
  (1)对保持架材料的常规要求
  1)具有低的硬度和高的耐磨性,虽然硬度高的材料耐磨性都较高,但如用高硬度材料作保持架,会磨损滚动体,给旋转性能带来不良影响,甚至产生 ;抱合现象 ;。
  2)由于保持架承受反复拉伸和压缩应力,所以要求具有较高的疲劳强度;有必要的弹性和韧性;耐离心力。
  3)保持架重量轻,使用密度小的材料,以使SUNTHAI轴承的摩擦损失小,能缓和滚动体进出负荷区的冲击。
  4)塑性加工及切削加工性能良好;有足够的刚性和柔顺性。
  5)套圈和滚动体之间的摩擦系数小。
  6)化学上稳定,不易生锈。
  (2)对保持架材料的附加要求
  1)表面有可润性,即能附着或贮存润滑剂;
  2)导热性好,散热快;热容量大,耐热;
  3)具有一定吸振能力,不易与其他零件产生共振。
  4)不易产生噪声。
  (3)对保持架材料的特殊要求
  1)在必须具有耐腐蚀性的场合下,由于保持架不需要特高的硬度,故可采用奥氏体不锈钢,而0Cr18Ni9钢使用得最多;
  2)在高温场合下,也使用具有足够的高温强度的奥氏体不锈钢;
  3)当特别需要提高保持架强度时,可以使用低碳钢板进行碳氮共渗表面处理;
  4)在需要自润滑的条件下,可使用石墨钢保持架,或能贮油的多孔材料制造保持架;
  5)在磁场中工作时,有时要求材料不干扰外磁场,也不受外磁场的影响。
  轴承温度,一般可根据轴承座的外部温度推测。但利用油孔直接测量KOYO轴承外圈的温度更加准确。轴承温度,从运转开始逐渐升高,通常1~2小时后温度稳定。如果轴承安装不良,温度会急剧上升,出现异常高温。其原因诸如润滑剂过多、KOYO轴承游隙过小、安装不良、密封装置摩擦过大等。高速旋转的场合,轴承结构、润滑方式的选择错误等也是其原因。
  KOYO轴承的转动用听诊器等检查,有较强的金属噪声、异音、不规则音等说明异常。其原因有润滑不良、轴或轴承座精度不良、轴承损伤、异物侵入等。
  1、瓦面腐蚀:光谱分析发现有色金属元素浓度异常;铁谱中出现了许多有色金属成分的亚微米级磨损颗粒;润滑油水分超标、酸值超标。
  2、轴颈表面拉伤:铁谱中有铁系切削磨粒或黑色氧化物颗粒,金属表面存在回火色。
  3、轴颈表面腐蚀:光谱分析发现铁元素浓度异常,铁谱中有许多铁成分的亚微米颗粒,润滑油水分超标或酸值超标。带座外球面轴承此类轴承在设计上也具有一定调心性,易于安装,具有双重结构的密封装置,可以在恶劣的环境下工作。轴承座一般是采用铸造成型。
  4、表面拉伤:铁谱中发现有切削磨粒,磨粒成分为有色金属。外球面轴承实际上是深沟球轴承的一种变型,特点是它的外圈外径表面为球面,可以配入轴承座相应的凹球面内起到调心的作用。外球面轴承主要用来承受以径向负荷为主的径向与轴向联合负荷,一般不宜单独承受轴向负荷。带座外球面轴承此类轴承在设计上也具有一定调心性,易于安装,具有双重结构的密封装置,可以在恶劣的环境下工作。轴承座一般是采用铸造成型。
  5、瓦背微动磨损:光谱分析发现铁浓度异常,铁谱中有许多铁成分亚微米磨损颗粒,润滑油水分及酸值异常。
  在液体润滑条件下,滑动表面被润滑油分开而不发生直接接触,还可以大大减小摩擦损失和表面磨损,油膜还具有一定的吸振能力
型号
Designation
尺寸
Dimensions
基本额定载荷
Basic Load Ratings
极限转速
Limiting Speed
重量
Mass
dDB
r1
min.
r
min.
动  Cr
Dynamic
静  Cor
Static
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