What details should I pay attention to purchasing cross roller bearings?
Because roller cross arrangement, so only 1 sets of cross roller collar can withstand various direction load, compared with the traditional model, increase the rigidity of 3~4 times. At the same time, because the cross roller bearing inner ring or outer ring is a two division structure, the bearing clearance can be adjusted, even if the preload is applied, high precision rotary movement can be achieved. In the design of the new spindle, select the cross roller bearings, consider the spindle performance parameters, determine the most critical performance, and then go to further exploration. (including: spindle speed, precision spindle, spindle rigidity, spindle life, spindle, spindle reliability) decided on the actual size of main parameters, the gauge spindle (shaft diameter, length, bearing span). According to the bearing form (a ball or cylindrical roller bearings), line (line number), drive (drive belt, gear motor, built-in motor), oil (grease, oil and gas, oil mist, jet) etc.
main parameters set to determine its structure. 1, the axial load bearing, mainly bearing axial load bearings, generally thrust bearings, its nominal contact angle a0>450. Thrust bearings and thrust angular contact ball bearings can be subjected to axial force in one or two directions at the same time, depending on the structure. When subjected to stress is very high and the cylindrical roller thrust bearing and thrust roller bearings. Thrust roller bearings and thrust angular contact ball bearings can withstand axial load and radial load, thrust bearings can withstand axial load other. 2 、 the radial load of bearing mainly bears the radial load of INA, cross roller bearings are radial bearings. Nominal contact angle of such bearings a0<=450. The same roller bearings can carry more radial loads than ball bearings. N and NU cylindrical roller bearings can only bear radial load, and other types of radial bearings can bear radial load as well as axial load. 3, the length of the sliding fit to compensate non separable bearings, can also be used as swimming bearings. Of these bearings, one of the two rings is fitted with an axial fixed surface. Therefore, a ferrule of the bearing can be moved on its supporting surface.
4, bearing itself length compensation, support a shaft and bearings, usually use fixed bearings and swimming bearings combination structure. Moving INA cross roller bearings compensate for shaft length error and thermal expansion. NU and N cylindrical roller bearings are ideal floating bearings, which can compensate the length of the bearings themselves. The inner and outer rings of the bearing can be tightly matched. After determining the dimensions and types of precision bearings, consider the specific design of the bearings. Take full account of the bearing fatigue life, rigidity, heating and other factors, select the most appropriate bearing clearance (preload). Because of the clearance and preload of bearings, the performance of INA cross roller bearings is the most critical, and the more it runs at high speed, the more critical it is, so it must be considered carefully. When not selected, problems such as early breakage or sintering occur. There is a need to move from fourth steps to third steps, or from fourth to second. After the design of the spindle structure is determined, the necessary conditions for the actual installation are taken into account. The installation of high precision bearings, shaft and bearing seat accuracy, tolerance, fit, installation and fixation of the tight nut tightening force, the actual installation of the INA cross roller bearings preload and internal clearance confirmation. Luoyang jiuliang Bearing Co., Ltd. since 1998 since its establishment, adhering to the concept of industrial salvation, the user responsible attitude, every little bit training, fine quality, so that the business step by step, on the upgrade.
