本帖最后由 星丹 于 2010-3-24 14:36 編輯 Y' e4 i7 `* l9 `$ o) |) A; v
5 D: Y& h# ~/ y貼圖① 剝離和點蝕 Flaking and Pitting0 \+ o" A5 E" \) X0 f& x3 j* B
( Z/ w$ V" g% h) D1 f現(xiàn)象、原因和對策$ e- X/ m1 Q# |8 C% Y
Phenomena , causes and countermeasures 失效示例
3 @3 ^, P; w2 O3 o/ ^" B" h$ YExamples of failures
8 R" P2 ^# n, {/ C. v3 \. s# pPhenomena 剝離是指因材料的滾動疲勞在滾道面及滾動面表層部分出現(xiàn)的魚鱗狀損傷。產(chǎn)生這種現(xiàn)象時，可認為軸承已達到壽命。
. T1 M: n z5 }4 h, q! U因材料的滾動疲勞引起的損傷還有點蝕，是指在滾道面出現(xiàn)的深度為0.1mm左右的微孔
7 k3 j1 @2 S9 A; [2 e3 Z: [% }Flaking 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.) j; \8 H1 v) z6 d) ]
Pitting is a phenomena in which small holes 0.1mm in depth are generated on the raceway surface by rolling fatigue. * E, ?; \. P8 b4 x" R
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Causes ● 軸承內(nèi)部游隙過小/ e; y0 H0 o4 c7 w6 R0 C8 d
During operation,bearing internal clearance becomes narrower than specified.# I" r: S y" J5 M) |
● 軸承安裝不良/ y5 O; Y& j# h+ {' X
Bearing is mounted at an inclination by mistake .
4 E$ q9 c! |# \- J9 q( Y. N● Flaw is created during mounting,brinelling ,nicks,rust etc.. t* l5 @. m8 d( ^% k; I' V
● 軸或外殼的精度差
5 F: F2 _5 B0 @# g) gInaccurate shape of shaft or housing. - k1 N. _# ^+ w$ `
Countermeasures ◆ 選擇合適的軸承內(nèi)部游隙
: v8 [+ d/ q- r Y◆ 正確定心
/ O4 s3 a( L* S$ t, |◆ 修正軸或外殼擋肩端面的垂直度8 b6 w$ @, R. @. d4 B* d+ n% \/ N
◆ 改進安裝作業(yè)方法 |
發(fā)表于 2009-10-13 15:19:10
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