Bearing steel surface strengthening method

FratBro23
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Business & Finance
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Question description

Rolling bearing performance depends largely on the material performance. Imported bearings with low alloy and high purity usually overwhelm chrome steel and crafting bearing rings and rolling body materials. To withstand the high impact load and alternating bending stress of import bearings, using carburizing steel.

In recent years, due to imported bearing steel quality constantly raise (rise in price, of course), make imported FAG 6207 bearings capacity increases significantly. Research results and practical experience have proved that today's standard  import bearings rolling bearing steel manufacturing, in good lubrication, clean environment and under the condition of load is not big, have infinite fatigue strength can be achieved.

1, bearing radial load

Mainly bear radial load bearing for centripetal bearing. This type of bearing the nominal contact Angle of a0 < = 450. Size of the same NSK bearings is larger than the ball bearing can bear radial load.

N and NU type cylindrical roller bearing can bear radial load, other types of centripetal bearing can bear radial load, can also carry axial load.

2, bearing axial load

Mainly bear axial load of bearing, generally for the thrust bearing, its nominal contact corner a0 > 450. Thrust bearing and thrust angular contact ball bearing according to the different structures can take one or two directions at the same time of axial force. When bear particularly high force optimization with thrust cylindrical roller bearings, thrust spherical roller bearings.

Thrust spherical roller bearings and one-way thrust angular contact ball bearings can carry axial load and radial load at the same time, other thrust bearing can only carry axial load.

3, the length compensation of the bearings of their own 

A shaft bearing usually adopts fixed TIMKEN 382A bearings and floating bearing structure. The winding shaft bearings make compensation for length error and thermal expansion.

NU type and swimming N type cylindrical roller bearings are the ideal bearing, the bearing itself can compensate for length. Bearing inner and outer circle can use a tight fit.

4, the length of the sliding fit compensation

Integral bearing (such as deep groove ball bearing and spherical roller bearing) can also be swimming bearings. This kind of bearing with a use of the two ring, no axial fixed surface. Therefore, bearing a ring can be the supporting surface activity.

5, separable bearing (accuracy)

This is a kind of bearing ring can be installed in a separate, when both ring with tight fit its advantage is very outstanding.

FAG bearings ceramic ball bearings can be completely cover now precision, medium speed above all steel bearing all the applications. FAG bearings imported ceramic bearing performance is much better than the all steel bearings, life is now using the bearing life increased by more than 3 times, can save a lot of down time, reduce scrap, reduce inventory bearing spare parts, etc.

Compared with FAG bearing steel performance, weight bearing steel is 30%, 40%, can reduce some of the load increases because of the centrifugal force and slip. Due to the high wear resistance, rotational speed is 1.3 1.5 times the size of bearing steel, can reduce the channel because of the high speed rotating surface damage. Elastic modulus is 1.5 times higher than that of bearing steel. High stress elastic is small, can decrease due to the load generated by the deformation. Hardness is a FAG bearing steel 1 times, reduce wear and tear. Compressive strength is imported FAG bearing steel 5 to 7 times. Thermal expansion coefficient accounts for less than 20% bearing steel. Friction coefficient is less than 30% bearing steel, can reduce because of the friction heat, can reduce the bearing early spalling failure caused by high temperature, equivalent tensile, bending and metal.

Separable bearings include four-point contact ball bearing, two and a half circle of double row angular contact ball bearings, cylindrical roller bearings, tapered roller bearings, thrust ball bearings, thrust cylindrical roller bearings, thrust spherical roller bearings.

Here is also the introduction of the integral bearing types, a integral bearings: deep groove ball bearings, single row angular contact ball bearings, self-aligning ball bearings, roller bearings and spherical roller bearings.


Tutor Answer

(Top Tutor) Daniel C.
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School: University of Maryland
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