By introducing common faults in the tapered roller bearing maintenance

Tapered roller bearing is mainly used with the cars, mining, plastic machinery and other industries, and bearing in the process of using, maintenance is the necessary way to maintenance of tapered roller bearings, found that when we are in tapered roller bearing bearing often arise some problems, which is common in our daily life bearing failure. The bearing network ( Hereinafter referred to as:) According to understand, here share with some of the common faults in the tapered roller bearing maintenance. 1, pitting pitting: refers to the parts that are scattered or clustered on the surface of small pit. When we are in the process of inspection, found when open the taper roller bearing, the bearing due to the large area of inner ring raceway is pitting is to keep the rack of roller and inner ring raceway in the process of rotation, the temperature rise gradually, cause thermal shaft, the bearing is scrap processing. As shown in figure 1, 2. Figure 1, figure 2 tapered roller bearing raceway surface pitting caused by reasons: 1) metal surface fatigue, under the effect of the cycle of rolling contact stress, the micro crack in the metal surface to form, and gradually developed into a pit of tiny stripping. (2) the surface of the metal inclusions or large granular carbide form stress concentration, early to produce micro-crack and gradually developed into the shed. (3) improper assembly or bad lubrication. 2, bearing grinding bearing grinding 'leather: refers to the bearing surface due to fatigue of very thin metal peeling phenomenon. Bearing grinding skin is one of the common faults in the bearing maintenance, often find a fault in bearing appearance inspection. Below the bearing is a bearing workers in turn the inspection process, found that the bearing rotating different sound, found after decomposition of bearing roller scratch discoloration, outer ring raceway circular grinding skin ( Figure 3, figure 4) 。 In figure 3, figure 4 causes of bearing raceway surface skin that comes as follows: (1) the early fatigue on the metal surface. Due to the effect of sliding friction and rolling contact stress of extremely shallow fatigue spalling. (2) material heat treatment. (3) bad lubrication. (4) overload stress. 3, bearing its bearing: refers to the bearing surface under the action of the cycle of high contact stress of metal flake peeling phenomenon. Bearing dissection is one of the most common fault in bearing maintenance, also harm one of the biggest bearing failure factors in the operation of the truck. Bearing after stripping, have a certain depth and area, the surface is uneven squamous, with sharp groove Angle, can hear clearly in the bearing rotation to check different sounds. Bearing stripping commonly occur in the bearing inner and outer ring raceway surface and roller rolling surface. As shown in figure 5, the bearing inner ring raceway surface stripping, from bearing appearance inspection, found on the left side of the bearing binding, different sound, after withdrawal, decomposition bearing found outside the bearing inner ring raceway serious stripping, stripping area of about 30 x 25 mm. Figure 5 as shown in figure 6, the bearing outer ring raceway surface stripping, from bearing appearance inspection, the workers found wheel rotation of shaft number 15942 on the left side of the bearing has a different tone, after decomposition examination found that the bearing outer ring raceway in large area of stripping, the bearing running time less than 4 years. Figure 6 the cause of bearing dissection: (1) bearing material, improper heat treatment led to the low hardness is not standard strength. (2) oil mixed with impurity is one of the factors which causes the inner ring raceway outside stripping. In the process of assembly (3) car with wheel there savage homework, bearing raceway surface by the impact force is one of the factors which causes the bearing stripping. 4, bearing burning bearing raceway surface burning is bearing metal surface adhesion by the migration of the molten metal. Due to the bearing clearance is too large or too small, or poor lubrication of grease have impurities, severe abrasion caused a surge ( As shown in figure 7) 。 Figure 75, grease color oil color can also lead to bearing different sound, affect the bearing is used, the threat to run. Below the bearing ( As shown in figure 8 and figure 9) 。 Roller was found on the scene after the withdrawal scratches, grease. Of bearings, after the front cover, shaft end bolts, block, wheel, bearing saddle, after verification, bogie side frame and other related information, ultimately determine the cause of lipid discoloration and roller scratch is oil mixed with water and water containing particles, particles cause the roller abrasion and grease color of different level, eventually lead to bearing different sounds. Six, bearing oil seal darting out of the bearing oil seal, is one of the more common faults in the operation of the bearing. Bearing oil seal device to prevent external dust, moisture, the invasion of the metal powder and other pests, prevent leakage bearing chamber of lubricant. As shown in figure 10 for workers check found fault bearing oil seal came out. Figure 107, bearing raceway surface dent bearing dent is due to the cleanness of the bearing is not high, due to internal containing metal or other material. Bearing appearance inspection, bearing rotating different sound, found after withdrawal, decomposition bearing bearing inner ring raceway, the outer ring raceway are a handful of dent ( As shown in figure 11, figure 12) 。 By the analysis of the bearing in the general maintenance, cleanness of may is not enough, internal mixed with rigid particles, the bearing itself, there are some quality problem in the operation of the vehicle in, bearing in the rotation, because of the hard particles and the friction of bearing inner and outer ring raceway, cause inner ring raceway, outer ring raceway dent in several locations. Keep on roller bearing inner and outer ring in relative rotation to produce different sound. Therefore, the bearing of daily maintenance and maintenance is also very important, to improve the efficiency of mechanical equipment use, and the service life of bearing, that is to say, bearing maintenance is the necessary way, bearing is one of the important parts, machinery and equipment safeguard shaft is also in the maintenance of equipment.