2, with the bearing with the journal and the bearing housing bore by GB1031-83 requirements, the journal roughness Ra value of less than 1.6μm, bearings inside the hole roughness Ra value of less than 2.5μm.
3, with and ZGCr15 steel GCr15 bearing rings and rolling midnight, its rings and roller hardness value should be 61 ~ 65HRC; using GCr15SiMn and ZGCr15SiMn steel, the hardness value should be 60 ~ 64HRC. Hardness inspection method and the same part by the uniformity of hardness JB1255 requirements.
4, check the bearing radial clearance and axial clearance shall comply with the requirements of GB4604-84.
5, the bearing inner and outer ring raceway should be no peeling, severe wear, inner and outer rings are not allowed to have cracks; ball should be no wear, cage without serious distortion, rotation no abnormal noise and vibration, stop should be gradually stopped.
6, C-level tolerance for tapered roller bearings, roller and ring raceway contacts accuracy, under the action of a certain load, check for coloring, contact marks should be continuous, rolling contact length of not less than 80 picture-line.
Bearing life is associated with manufacturing, assembly, use all closely related, must make every link in order to make the bearing in the best operating condition, thus extending bearing life.
1, the shaft and the bearing housing tolerances choice and control: bearings are pressed into block after no sense should be flexible rotation. If significant rotation is not flexible, it indicates that the shaft size is too large, tolerance to downward. Such as bearings pressed into the shaft turned by hand obvious "imperfections" sense, it may be too much tolerance of the shaft or shaft roundness bad. So good control shaft and the bearing housing tolerance should also control the roundness, many domestic manufacturers only tolerance control, no roundness control.
2, the bearing assembly methods: Because the bearings are precision products, such as improper assembly is very easy to damage the bearing channel, leading to bearing damage. Bearing in the assembly should have a dedicated mold and can not beat the pressed into the shaft when the force only a small circle, the circle can only push a large circle force. Assembly requires the use of pneumatic or hydraulic, press-fit upper and lower mold to remain outside the state level, if inclined bearing channel will lead to damage due to power, leaving the bearing guide ring.
3, the assembly to prevent foreign bodies: Bearing mounted to the rotor can easily do balancing balancing generated when the iron filings into the bearing, so it is best to do before loading the bearing dynamic balancing. There are some manufacturers in order to facilitate assembly, the assembly in the bearing chamber coated with some oil or grease lubricant effect, but the operator is often difficult to control the amount, if the oil or grease in the bearing chamber accumulates more in the bearing rotation is easily along the shaft into the bearing. Bearing chamber preferably not coated with oil or grease, such as non-coated bearings shall not be have to control indoor accumulates.
4, paint rust prevention: paint rust characterized by multiple in sealed-type motor, motor in the assembly sounds good, but put in the warehouse for some time, the motor becomes very abnormal sound, remove the bearing severe rusting. Many manufacturers will be considered a bearing problem, through our continuous publicity, and now the motor plant has been realized mainly insulating paint problems. The problem is mainly because the insulating paint out of the volatile acidic substance at a certain temperature, humidity, the formation of corrosive substances cause corrosion of the bearing channel bearing damage. The problem can only be a good selection of insulating paint, and after a period of time after drying ventilation assembly.
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