Bearing common sense: how to choose "quality INA rolling bearings"
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Bearing common sense: how to choose "quality INA rolling bearings"
Source: China Bearing Network Time: 2018-04-15
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In the process of drawing a new spindle; before selecting the INA bearing; first consider the spindle function parameters; roughly determine the most important function; then enter further exploration. (Including: spindle speed; spindle accuracy; spindle stiffness; spindle life; spindle heating ; spindle reliability)
After determining the spindle parameters; the practical scale of the probe spindle (shaft diameter, length, bearing span).
According to the bearing method (ball or cylindrical roller bearing); the arrangement (column number); the driving method (drive belt, gear, motor, built-in motor); smooth (grease, oil, oil, oil mist, eruption) and other spindle parameters to determine Its layout.
1. The axial load of the bearing The bearing that receives the axial load is generally a thrust bearing; its nominal touch 旮旯a0>450. The thrust bearing and the thrust angle touch ball bearing can accept one or two axes together according to the different layout. Xiangli. When the receiving force is particularly high, it is preferred to use thrust cylindrical roller bearings and thrust spherical roller bearings.
Thrust spherical roller bearings and one-way thrust angle contact ball bearings can accept axial and radial loads together; other thrust bearings can only accept axial loads.
2. Bearing radial load The INA bearing that accepts radial load is the radial bearing. The nominal touch angle of this type of bearing is a0<=450. The rain-like roller bearing can receive more radial load than the ball bearing.
N-type and NU cylindrical roller bearings can only accept radial loads; other types of radial bearings can accept both radial loads and axial loads.
3, the length of the bearing itself to support a shaft and bearings generally choose the combination of fixed bearing and swimming bearing combination. The swimming INA bearing compensates for the length error and thermal expansion of the shaft.
NU-type and N-type cylindrical roller bearings are aspirational swimming bearings; these bearings can compensate for the length itself. The inner and outer rings of the bearing can be used tightly.
4, the length of the sliding cooperation can not be separated from the bearing can also be used as a swimming bearing. One of the two ferrules of this type of bearing chooses cooperation; there is no axial fixed surface. Therefore; a ferrule of the bearing can move on its supporting surface .
After determining the size and variety of the fine bearing; consider the detailed depiction of the bearing.
Fully consider the bearing fatigue life, rigidity, heat and other factors; select the most appropriate bearing clearance (preload).
Because of bearing clearance and preload; the most important for INA bearing function; the more high-speed work, the more important, so it is necessary to think carefully. Picking out the time; it will also attack early damage or sintering problems. It is necessary to from the 4th Step to step 3; or from step 4 to step 2; repeat thinking.
After determining the layout of the spindle, consider the necessary conditions for practicing the device.
Accuracy of the shaft and housing of the high-precision bearing, the cooperation of the public service, the tightening force of the tightening nut required for the fixing of the device, the INA bearing preload after the practical device and the recognition of the internal clearance.
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