Bearing discoloration. When the bearing runs at a continuous high temperature, it will produce black or blue color. The main reasons for bearing discoloration are: smooth bearing does not fit the technical requirements
The fault mechanism of bearings
1. Common faults of bearings.
(1) Bearing discoloration. When the bearing runs at a continuous high temperature, it will produce black or blue color. The main reasons for bearing discoloration are: smooth bearing does not fit the technical requirements; Dirt or impurities in the process of bearing installation; Bearing, journal, shaft hole fit more loose, resulting in sliding friction bearing inner and outer ring; The different center between the bearing seat hole and the journal, resulting in abnormal bearing operation; Bearing due to overspeed or overload operation, operation itself designed bearing capacity; The axial clearance of cylindrical roller bearings is smaller, bearing and seal installation, gaskets and bushings produce greater friction.
(2). Cracks appear on the inner and outer rings of the bearing. On the inner and outer rings of bearings, cracks at different levels are mainly caused by: defects in bearing quality or defects in the inner steel used by bearings; The shaft receives a large impact load from the outside; When installing and disassembling the bearing, the shaft receives direct beating from the iron, resulting in cracking of the inner and outer ring of the bearing; The bearing inner ring, outer ring, seat hole and journal are not well matched, resulting in uneven force on the raceway, and cracks on the inner ring and outer ring.
(3). Bearing corrosion. Bearing seal installation failure, resulting in external dirt or water into the bearing, resulting in bearing corrosion.
(4) Ball bearings or rollers are broken. Because the clearance of the bearing ball or roller device is too small, the bearing is subjected to violent impact in the process of use, and the smooth agent is mixed with iron filings and other hard substances, resulting in the crushing of the ball or roller.
(5) The raceway shows pit scars. The shaft receives external impact load or due to poor smoothness, the raceway exceeds the force design specification, resulting in pit scar.
(6) Bearing rotation is laborious. Bearing running speed is slow, hand rotation can not rotate or rotate hard, this is mainly due to the bearing is not cleaned clean, bearing journal, inner ring or outer ring with pore is too small, resulting in bearing deformation or large force, eventually resulting in operation effort.
2. Fault mechanism of bearings.
Bearing is more common in most mechanical equipment, has a high utilization rate, but also has a high damage rate. Bearing has many advantages such as good starting performance, high reliability and easy maintenance, which are widely used in mechanical equipment. Bearing in the equipment is in the same speed state, has a high bearing capacity, long-term force action, resulting in bearing relative to other parts, it is easy to attack faults, in all kinds of mechanical fault types, bearing faults occupy a large proportion.
Rolling bearing, by contrast, is greater than sliding bearing radial size and vibration to match, machinery and equipment under a state of high speed rolling bearing to less than the life of the sliding bearing, noise also compare high, main function is to accept the centripetal bearing radial force, its composition includes four local, namely, inner and outer ring, rolling body and rolling body insist on rack. The inner ring is tightly set on the journal and rotates synchronously with the shaft, while the outer ring is in the bearing seat hole. When the inner and outer rings rotate relatively, the roller will roll on the raceway of the outer and inner rings of the inner ring, and the two will be separated by a stick rack to avoid friction. Bearing is most situations can present problems, is mainly due to the operation in the process of sealing shaft sleeve and a fixed bolt loose parts, forming roller and roller stick to wear, or bearing gland, shaft sleeve, etc have crack, the impurities such as water or dust from these gaps in smooth oil dirty bearing box to form smooth, eventually cause bearing fault.
3. Bearing damage.
Under normal conditions, only normal use, bearings can be used until the fatigue life. Bearing presents early damage of no durability, premature damage and fatigue life, which is called bearing fault. Investigate the reason, bearing faults are generally due to the device or use of not paying attention to the smooth bearing, resulting in foreign body invasion from the outside, or caused by the thermal effect of the bearing shell smooth bad, so as to early damage.
Bearing discoloration. When the bearing runs at a continuous high temperature, it will produce black or blue color. The main reasons for bearing discoloration are: smooth bearing does not fit the technical requirements
The fault mechanism of bearings
1. Common faults of bearings.
(1) Bearing discoloration. When the bearing runs at a continuous high temperature, it will produce black or blue color. The main reasons for bearing discoloration are: smooth bearing does not fit the technical requirements; Dirt or impurities in the process of bearing installation; Bearing, journal, shaft hole fit more loose, resulting in sliding friction bearing inner and outer ring; The different center between the bearing seat hole and the journal, resulting in abnormal bearing operation; Bearing due to overspeed or overload operation, operation itself designed bearing capacity; The axial clearance of cylindrical roller bearings is smaller, bearing and seal installation, gaskets and bushings produce greater friction.
(2). Cracks appear on the inner and outer rings of the bearing. On the inner and outer rings of bearings, cracks at different levels are mainly caused by: defects in bearing quality or defects in the inner steel used by bearings; The shaft receives a large impact load from the outside; When installing and disassembling the bearing, the shaft receives direct beating from the iron, resulting in cracking of the inner and outer ring of the bearing; The bearing inner ring, outer ring, seat hole and journal are not well matched, resulting in uneven force on the raceway, and cracks on the inner ring and outer ring.
(3). Bearing corrosion. Bearing seal installation failure, resulting in external dirt or water into the bearing, resulting in bearing corrosion.
(4) Ball bearings or rollers are broken. Because the clearance of the bearing ball or roller device is too small, the bearing is subjected to violent impact in the process of use, and the smooth agent is mixed with iron filings and other hard substances, resulting in the crushing of the ball or roller.
(5) The raceway shows pit scars. The shaft receives external impact load or due to poor smoothness, the raceway exceeds the force design specification, resulting in pit scar.
(6) Bearing rotation is laborious. Bearing running speed is slow, hand rotation can not rotate or rotate hard, this is mainly due to the bearing is not cleaned clean, bearing journal, inner ring or outer ring with pore is too small, resulting in bearing deformation or large force, eventually resulting in operation effort.
2. Fault mechanism of bearings.
Bearing is more common in most mechanical equipment, has a high utilization rate, but also has a high damage rate. Bearing has many advantages such as good starting performance, high reliability and easy maintenance, which are widely used in mechanical equipment. Bearing in the equipment is in the same speed state, has a high bearing capacity, long-term force action, resulting in bearing relative to other parts, it is easy to attack faults, in all kinds of mechanical fault types, bearing faults occupy a large proportion.
Rolling bearing, by contrast, is greater than sliding bearing radial size and vibration to match, machinery and equipment under a state of high speed rolling bearing to less than the life of the sliding bearing, noise also compare high, main function is to accept the centripetal bearing radial force, its composition includes four local, namely, inner and outer ring, rolling body and rolling body insist on rack. The inner ring is tightly set on the journal and rotates synchronously with the shaft, while the outer ring is in the bearing seat hole. When the inner and outer rings rotate relatively, the roller will roll on the raceway of the outer and inner rings of the inner ring, and the two will be separated by a stick rack to avoid friction. Bearing is most situations can present problems, is mainly due to the operation in the process of sealing shaft sleeve and a fixed bolt loose parts, forming roller and roller stick to wear, or bearing gland, shaft sleeve, etc have crack, the impurities such as water or dust from these gaps in smooth oil dirty bearing box to form smooth, eventually cause bearing fault.
3. Bearing damage.
Under normal conditions, only normal use, bearings can be used until the fatigue life. Bearing presents early damage of no durability, premature damage and fatigue life, which is called bearing fault. Investigate the reason, bearing faults are generally due to the device or use of not paying attention to the smooth bearing, resulting in foreign body invasion from the outside, or caused by the thermal effect of the bearing shell smooth bad, so as to early damage.
