Powder metallurgy bearing applications in the most prone to failure
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Because the PM bearings are high-precision products, such as improper assembly bearing channel easily damage, leading to bearing damage. The bearing assembly should have a dedicated mold can not beat, only a small circle force pressed into the shaft, the pressure of the big circle can only large circle force. Assembly requires the use of pneumatic or hydraulic press-fit upper and lower die outside the state level, tilt, if any, the bearing channel will result in damage due to power, the bearings produce a guide ring.
PM bearings to be easily mounted on the rotor to be balanced when the dynamic balance generated by iron filings into the interior of the bearing, so it is best mounted bearings do balancing. Some manufacturers in order to facilitate assembly, the bearing indoor assembly coated with oil or grease for lubrication effect, but often operating staff is difficult to control the amount of, oil or grease in the bearings indoor accumulates more in the rotation of the bearing. easy to enter the interior of the bearing along the shaft. Bearing the best thing is not coated with oil or grease, such as non-coated not have to control shall not bearing indoor accumulates.
Severe rusting paint rust is characterized by multiple motor in the sealed-motor assembly sound good, but put in the warehouse for some time, the motor abnormal sound change, remove the bearing. Many manufacturers will be considered bearing our continuous publicity Motor Factory have realized mainly insulating paint. The problem is mainly due to the The insulating paint out of the volatile acidic substance is formed in a certain temperature, humidity of corrosive substances, powder metallurgy bearing channel corrosion leading to bearing damage. The problem can only be a good selection of insulating paint, assembly and after the ventilation period of time after drying.
1, watt surface corrosion: spectra showed abnormal concentration of non-ferrous metal elements; iron spectrum submicron wear particles of many non-ferrous metal components; lubricants excessive moisture, acid value exceeded.
2,Journal surface strain: Ferrography, cutting abrasive or black oxide particles of iron-based metal surface tempering color.
3, Journal surface corrosion: spectra showed abnormal concentration of iron, iron spectrum the many iron components submicron particles, lubricants excessive moisture or acid value exceeded.
4, the surface strain: Ferrography in cutting abrasive, abrasive ingredients for non-ferrous metals.
5, tile back fretting wear: spectra showed abnormal iron concentration, the many iron content in the sub-micron wear particles in the iron spectrum, lubricants moisture and acid abnormalities.
Liquid lubrication conditions, the sliding surface lubricants separate without direct contact, can also greatly reduce friction loss and surface wear, the film also has a certain vibration absorption capacity
