In the new spindle design, bearing selecting mainly considers the spindle performance parameters, roughly determine the most critical performance, and then enter the further exploration. (Including: spindle speed, spindle accuracy, spindle stiffness, spindle life, spindle heating, spindle reliability) After determining the spindle parameters, proceed to the actual size of the probe spindle (shaft diameter, length, bearing span). According to the bearing form (ball or cylindrical roller bearings), the arrangement (number of columns), the drive mode (transmission belt, gear, motor, built-in motor), lubrication (grease, oil, oil mist, spray) to decided its structure.1, bearing radial load
The bearings, which are primarily subjected to radial loads, are tapered. The nominal contact angle of this type of bearing a0 <= 450. The same roller bearing is larger than the radial load that the Ball Bearing
N-type and NU-type cylindrical roller bearings can only withstand radial load, other types of radial bearings can withstand radial load, can also bear axial load.2, the bearing axial load
Bearings that are primarily subjected to axial loads are generally thrust bearings, and their nominal contact angles are a0> 450. Thrust bearings and thrust angular contact ball bearings according to the different structure can withstand one or two directions of the axial force. When the force is particularly high, it is preferable to use a thrust cylindrical roller bearing and a thrust spherical roller bearing.
Thrust spherical roller bearings and one-way thrust angular contact ball bearings can withstand both axial and radial loads, and other thrust bearings can only withstand axial loads.3, the length of the bearing itself compensation
Supporting a shaft and bearing is usually a combination of fixed bearings and swivel bearings. Traveling INA bearings compensate for the length of the shaft error and thermal expansion.
Type NU and N-type cylindrical roller bearings are ideal for sport bearings, and these bearings themselves can compensate for length. Bearing inner and outer ring can be used with a tight fit.4, the length of the sliding with the compensation
Inseparable bearings can also be used for swimming bearings. One of the two rings of this type of bearing is fitted with no axial fixing surface. Thus, a collar of the bearing can be moved on its bearing surface.
Determine the precision bearing size, type, consider the specific design of the bearing.
Fully consider the bearing fatigue life, rigidity, heat and other factors, select the most appropriate bearing clearance (preload).
As the bearing clearance and preload, the performance of the INA bearing the most critical, the more high-speed operation is more critical, it must be carefully considered. Improper selection, but also early damage or sintering and other issues. It is necessary to consider it from step 4 to step 3, or from step 4 to step 2.
After determining the spindle structure design, consider the necessary conditions for actual installation.
High precision bearing mounting shaft and bearing seat accuracy, tolerance fit, the installation of the required tightening nut tightening force, the actual installation after the INA bearing preload and internal clearance confirmation.