Analysis of common problems and causes of KOYO Bearings

Source: China Bearing Network Time: 2017-09-30

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When the interference between the bearing and the shaft diameter or the bearing housing hole is small; the press-in method is often used for installation. The simplest method is to use the copper rod and the hand hammer; the bearing ring with the interference cooperation is symmetrically struck in a certain order; The bearing can be smoothly pressed into the other. It can also be driven by a soft metal sleeve by a hammer or by a press. If the operation is not proper, the seat will be deformed and cracked; perhaps the hammer is hit by a non-interactive cooperation. On the seat; it will cause the raceway and KOYO bearing body to be indented or the bearing is directly damaged.
KOYO bearing is installed; if it has a large interference with the shaft diameter; it is usually installed by hot charging method. The bearing is placed in the oil drum filled with organic oil; the outside of the oil barrel is heated by hot water or flame; The oil temperature is controlled at 80 Â° C ~ 90 Â° C; usually does not exceed 100 Â° C; at most does not exceed 120 Â° C. After the bearing is heated, the agile is taken out on the journal. If the temperature is not properly controlled, the heating temperature is too high; The tempering causes the hardness to drop; the bearing tends to wear, fall off, and even crack during work.
It can be seen from the above that KOYO bearings can be adjusted regardless of the gap or the gap can be adjusted; they should be adjusted for axial clearance during installation (but some bearings with non-adjustable clearances do not need to leave axial clearance); The thermal elongation; then ensure the normal operation of the KOYO bearing body. If the axial clearance is too small; the bearing transformation will be difficult and hot; even if the KOYO bearing body is stuck or damaged, if the axial clearance is too large, it will lead to work. A strange sound occurs in the middle; it may even form a severe oscillation or damage the cage.
E. The coupling is not properly aligned. The input shaft of most working equipment is connected to the power shaft through the coupling; therefore, it is necessary to perform the alignment of the coupling when installing; the driving shaft and the driven shaft are on the same axis.
.3) Smooth oil KOYO bearings use smooth oil (or smooth grease) have a certain working temperature; when the temperature is too high, it will change; then lose the smooth effect; make the bearing burned due to high temperature. Other; smooth oil (or smooth grease) poor self-property or refueling (fat) at work; it will also form a rise in bearing temperature or abnormal sound.
.4) Rotor imbalance Generally speaking, the rotor of the working equipment must be moved and statically balanced before installation; therefore; the bearing will not present a problem. However, some rotors are subject to corrosion or solids during the working process. Wear of impurities; perhaps the axis is tortuous; it will cause unbalanced centrifugal force; then the bearing will heat up and oscillate; the raceway will be severely worn; until it is damaged.
.5) Check if the replacement is not in time for the bearing work; check according to the rules; if there is heat, abnormal sound, oscillation, etc.; timely parking to find the reason; eliminate the problem; if the bearing finds severe fatigue, oxidative corrosion, Worn pits, cracks, hardness drop to HRC <60; or when excessive noise can not be adjusted; should be replaced in time. If the inspection and replacement are not timely; it will form severe damage to the bearing and even the rotor; then affect the normal production. Others; the bearing is not properly disassembled, the oscillation of the equipment anchor bolts is loose; it will also cause the KOYO bearing raceway and the rolling body to be indented; the inner and outer races of the bearing are cracked.
3. Ways to eliminate the problem. 1) When replacing the bearing; look carefully at the new bearing; take a detailed look at the shaft diameter and the housing bore and rotor,
.2) When installing and disassembling the bearing; strictly carry out the overhaul process; carefully operate; prevent the bearing damage caused by improper assembly and disassembly,
.3) Refueling on time; ensuring that the bearing work condition is always outstanding.
.4) Careful review during work; find faults; eliminate them in time.

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