本帖最后由 星丹 于 2010-3-24 14:36 编辑7 B% p/ ?* ?2 f! D) N, D
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贴图① 剥离和点蚀 Flaking and Pitting# ^! M8 r' X/ T4 ^0 _7 Z( I" W
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现象、原因和对策
: a; z0 O C' [4 ~( A- @. wPhenomena , causes and countermeasures 失效示例# X$ j7 N4 B- Y, }2 _/ C; n/ ^3 ?
Examples of failures
1 S4 w- i5 u6 J6 BPhenomena 剥离是指因材料的滚动疲劳在滚道面及滚动面表层部分出现的鱼鳞状损伤。产生这种现象时，可认为轴承已达到寿命。) @- G: {5 r$ m4 N8 A5 M4 T
因材料的滚动疲劳引起的损伤还有点蚀，是指在滚道面出现的深度为0.1mm左右的微孔
" N! M; k# i8 C4 h, H d! W1 pFlaking is a phenomena in which the bearing surface turns scaly and peels off due to contact load repeatedly received on the raceway and rolling surface during roataion. Occurrence of flaking indicates that the end of a bearing’s service is near.
1 ~ |7 C0 v }, ]# x4 {9 o3 R. N2 m; tPitting is a phenomena in which small holes 0.1mm in depth are generated on the raceway surface by rolling fatigue.
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Causes ● 轴承内部游隙过小, a( E. A1 T) q& w
During operation,bearing internal clearance becomes narrower than specified.
8 f* T2 l. @4 {0 o" w+ M6 j. h" `● 轴承安装不良
$ e" V) G! G1 {- m) ^: yBearing is mounted at an inclination by mistake .2 M# h4 l/ ^4 [3 i* h
● Flaw is created during mounting,brinelling ,nicks,rust etc.' t0 y: H! ^* y6 ^9 Z4 p; Q
● 轴或外壳的精度差2 r | I/ G# [* `, U
Inaccurate shape of shaft or housing.8 x5 ?& p) P" F9 ^. Q" O) W
Countermeasures ◆ 选择合适的轴承内部游隙
5 g/ F; V/ d" v4 y! d◆ 正确定心+ E# S; P J! W% ]" S: q
◆ 修正轴或外壳挡肩端面的垂直度
: @# g% V# p- r3 ^4 H! i+ P! G( d◆ 改进安装作业方法 |
发表于 2009-10-13 15:19:10
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