What are the sealing devices for bearings?
What are the sealing devices for bearings?
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The invalidation forms of GCr15 bearing steel
by：Waxing
2020-09-18
Bearing steel under the combination of complex factors, bearing damage occurred after running quite a time.
The main form of damage has two kinds: one kind is contact fatigue damage, in the role of high contact stress, after repeated stress cycle, the working face local produce pits, increased bearing work noise, vibration, temperature, wear, lead to bearing will not operate properly.
Another is caused by the relative activity of abrasion damage.
Rolling bearing damage form is usually normal fatigue spalling.
Fatigue failure of bearing steel including the emergence and development of fatigue crack two process.
The initial fatigue crack produced in certain depth from the surface, the depth is consistent with the maximum shear stress in depth.
For the average size of bearing, with load is different, the maximum shearing stress should appear in the interface is about 0.
35 -
0.
A deep between 55 mm.
The area of metal under the effect of maximum shear stress, plastic deformation occurred in the first place.
If the contact stress is greater than the material of contact fatigue limit, then with the increase of stress cycles, ongoing plastic deformation has occurred plastic deformation, and due to plastic deformation to produce fatigue crack here.
Under normal circumstances, micro cracks on the surface is roughly 45 ° Angle.
In rolling bearing contact fatigue spalling crack on the trajectory under repeated stress is gradually expanding, usually stress distribution along the internal organization and material composition and uneven regional development, and extend to the surface, from the base of crack fracture and fatigue spalling.
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