NSK high-performance four row circular cone roller bearings in steel rolling mill equipment - bearing in the application of knowledge

Four row circular cone roller bearings in steel rolling mill equipment has been widely used. But due to the rolling mill equipment in operation, the inevitable cooling water, internal oxidation iron into bearing, bearing service life shortens greatly. NSK (to solve this problem, The Japanese seiko co. , LTD) As early as 20 years ago, the first to develop a roll with a sealing ring four row circular cone roller bearings, now it has become the industry standard of rolling bearing. But because the design loaded within the bearing oil seal, on the basis of the overall dimensions, compared to open four row circular cone roller bearings, bearing the rated carrying capacity are relatively lower. Therefore, the industry put forward the seal and not reduce the requirement of bearing capacity. High-performance four row circular cone roller bearings NSK company has very good performance, as shown in figure 1. High bearing capacity design through the new oil seal structure and the new bearing internal design, make the new design of high-performance sealing four row tapered roller bearing load capacity by 15% ~ 35% higher than that of the original design, is one of the original design in the design life. 6 to 2. 7 times, such as the high performance bearing NSK model for STF482KVS6151E, its main dimensions for the diameter of 343. 052 x 457 diameter. 098×254（ Unit: mm) , the original design of bearing load rating is 3100 kn, new design of bearing load rating of 4200 kn. Through innovative retainer processing method, will be the diameter of the retainer, multiply the number of roller bearing, and the design of the roller diameter, thus improve the rated carrying capacity of the bearing. The design of the new design of oil seal oil seal structure has been optimized, and the oil seal of the narrow width, the bearing roller length becomes longer. Shorter service life of the bearing oil seal of the relative bearing, so the bearing decomposition unpick and wash, often to the bearing oil seal for replacement. Change oil seal oil seal to replace the ease with which a direct impact on whether to bearing damage. NSK four row circular cone roller among the new oil seal and oil seal design, makes the replacement does not need to be riveted joint reinforcement, change is very easy, effectively avoid replacing oil seal for bearing caused by accidental injury, to extend the service life of the bearing. This design has been applied for a patent, as shown in figure 2. Improving economic efficiency of mill first, adopt sealed four row circular cone roller bearings avoids each roll changing oil added, reduce the cost of oil. Second, sealed bearing relatively clean the internal environment of extend its decomposition cleaning cycle, reduces the time cost. Again, due to the discharge greatly reduces the waste lipid, make the working environment is improved, reducing the pollution to the environment, but also reduce the cost of sewage treatment. Table 1 is about five stand cold rolling mill using sealed type bearings compared with open bearings. Do not count towards the oil supply partners, under the condition of sewage disposal, oil a year purchases alone save 52. 440000 yuan. 3 racks for roughing, 7 frame finishing rolling mill, oil costs a year can save 2. 4 million yuan only. NSK new design of four row circular cone roller bearings in the rated carrying capacity, easy operational aspects has been greatly improved, but also reduce the usage of grease, reduce the cost, and reduce the pollution caused by excessive use of grease.