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Introduction of Basic Elements of Purchasing INA Rolling Bearing
Jan 11, 2018

Introduction of Basic Elements of Purchasing INA Rolling Bearing

    In the new spindle design, before selecting the INA bearing, consider the main shaft performance parameters, roughly determine the most critical performance, and then enter the further probe. (including: spindle speed, spindle precision, spindle rigidity. Spindle Life, Spindle heating, Spindle Reliability)

    After determining the spindle parameters , the actual dimensions of the spindle of the gauge ( shaft diameter , length , bearing span ) are determined .

    According to the form of bearing (ball or cylindrical roller bearing), matching (matching number of rows, driving mode (belt, gear, motor, inside motor), lubrication (grease, oil and gas, oil mist). The main shaft parameters such as jet are set to determine its structure.

    1, Radial load of bearing

   The INA bearings , which are mainly subjected to radial loads , are radial bearings . The nominal contact angles of this type of bearings are 0 450 . The same roller bearings as the ball bearings are larger than the radial loads that the ball bearing can bear

    The N-type and NU-type cylindrical roller bearings can only bear radial loads, while other types of radial bearings can bear both radial and axial loads.

     2. Axial load of bearing

    The main bearing bearing bearing axial load is thrust bearing. Its nominal contact corner a0 > 450. Thrust bearings and thrust angular contact ball bearings can bear one or two directions of axial force simultaneously according to the structure. When the bearing force is especially high, the optimum selection of thrust cylindrical roller. Bearings and thrust centering 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.

    3. Length compensation of bearing itself

    The structure of supporting a shaft and bearing is usually a combination of a fixed bearing and a swimming bearing. The length error and thermal expansion of the compensating shaft of the INA bearing.

   NU-type and N-type cylindrical roller bearings are ideal swimming bearings, which can compensate for the length themselves. The inner and outer rings of the bearings can be tightly matched.

   4. Length compensation for sliding coordination

   The non separable bearing can also be used as a swimming bearing. One of the two rings of this kind of bearing is fitted with no axial fixed surface. Therefore, a ring of the bearing can move on its supporting surface.

    After determining the size and type of precision bearing, consider the specific design of bearing.

   Taking full consideration of the bearing fatigue life, rigidity, heating and other factors, choose the most appropriate bearing clearance (pre load).

  Because of bearing clearance and preload, INA bearing performance is the most critical, the more high speed operation is more critical, so we must carefully consider. Problems such as early breakage or sintering may occur. It is necessary to reconsider from step 4 to step 3, or from step 4 to step 2.

   After the design of the spindle structure is determined, it is necessary to consider the necessary conditions for the actual installation.

  The accuracy, tolerance and coordination of the installation shaft and bearing seat of high precision bearings, tightening force of fastening nuts for fixing and fixing, confirmation of INA bearing preload and internal clearance after actual installation are confirmed.