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Bearing failure analysis and improvement of rolling mill main reducer Zhou Linzong Chun Liqi Xie Xinghui Zhao Xiuting 2. Luoyang Bearing Co., Ltd., Nan Luoyang 471039; 2. Luoyang University. The working condition of Luoyang 471023 in Henan Province is based on the bearing of the main shaft reducer shaft of Benxi Iron and Steel Group 1500 hot rolling mill. For example, the imported double row cylindrical roller bearings 6440 and 6600 are used. The cage is a pillar welded structure. The bearing condition is the speed of the shaft shaft. It is 210 hearts and 15 and the radial load is 3 100 respectively. The impact load factor is 1.5, the impact frequency is 0.17 times, the inner ring rotates, the grease is lubricated, and the working at normal temperature. . The average bearing life is 6 months. The failure mode is that the broken part of the cage pillar is broken, the thick raceway and the roller are in good condition, especially the failure analysis of the fatigue peeling phenomenon causes the bearing failure to be the main reason that the roller speed of the bearing is also reduced during the bearing operation, and the cage is accompanied by the non-bearing The roller still runs at the original speed due to inertia, causing a momentary impact between the strut of the cage and the load bearing roller, and then the first impact with the cage strut when the roller returns to normal speed, the impact force is relatively The previous time was small, but the direction was opposite to the previous one. Therefore, the cage strut is always under the action of alternating shear stress, and stress concentration occurs at the welded portion of the strut and the tail of the thread. Finally, the strut is cut along the welded portion and the thread portion. The reason is that the joint strut is desoldered due to the use of the melt cage washer. The outer end surface is bonded to the end face of the strut by welding, the welding strength is poor, and it is easy to desold when subjected to impact or vibration load.
Improvement 1 reduces the impact force between the cage strut and the roller.
Received date 2 milk 01 in the design of the main parameters of the bearing, change the conventional design method of the bearing to pursue the maximum rated load, reduce the roller diameter and increase the number of rollers, while increasing the roller strut hole and strut diameter to improve the pillar and The overall strength of the cage. Compared with the pre-improvement, the rated static load of the bearing is basically the same, and the rated dynamic load is reduced by 6. It can still meet the actual working needs of the bearing, and the roller weight is reduced by 23 and 30 respectively. Although the rated load of the bearing is slightly reduced, it is effectively reduced. The impact of the small roller cage support extends the life of the strut. At the same time, due to the reduced diameter of the roller, the corresponding increase in the wall thickness of the ferrule can improve the impact resistance of the bearing. Thus delaying the cage, mentioning 1; 1 welding strength. Adopting the step welding port of the large molten pool to strengthen the welding strength; discarding the common thread undercut, adopting a small transition to realize the natural finishing of the thread, and reducing the stress concentration of the welded portion and the thread tail when the strut is stressed. In addition, the inner end surface of the retainer corresponding to the roller end face is optimized. First, the inner and outer radial end faces are chamfered to facilitate the entry of grease into the roller strut hole and improve the friction between the strut and the roller strut hole; The contact area between the small cage and the end face of the roller improves the contact characteristics and avoids the phenomenon of burn cement caused by excessive friction. Secondly, the welded portion of the pillar welding hole is changed from the original 45 chamfer to the counterbore to enhance the welding strength and avoid the desoldering.
3 change the bearing clearance. The working speed of the bearing is high, and the lubrication and cooling conditions are poor. The radial clearance of the bearing should be properly amplified. However, due to the strong impact in the bearing work, the bearing clearance cannot be too large. In practice, the radial clearance of the bearing is set at 0. Between the group and the 3 groups, Lixun, 1 radial clearance is 0.250.35. The improved bearing is practical and runs longer than the original product.
Editor Wen Chaojie