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Improve the precision of imported bearings and how to choose imported bearings based on conflicting torque
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1. After the end of the equipment in the main machine; if the radial runout of the measuring spindle is measured; it can be found that the measured value of each revolution has a certain change, and the measurement is carried out successively; it can be found that after passing the certain number of revolutions; this change will be approximately Repetitive rendering. The target for measuring the degree of this change is the cyclic rotation precision; changing the number of revolutions required to approximately repetitively represents the "quasi-period" of the cyclic rotation precision; the magnitude of the magnitude change in the quasi-period is large; that is, the loop Poor rotation accuracy.
For example, the preload is properly applied to the main shaft; the rotational speed is gradually increased to the near-operation speed; the "run-in" effect of the bearing is implemented; the cyclic rotation accuracy of the main shaft can be improved.
2. A factory trials the fine instruments; the spindle uses the 6202/P2 type bearing and its accuracy is still not satisfactory; the rear journal is thickened and the raceway is made on it to replace the inner ring; the steel ball is carefully measured; Each group of three particles; each group of steel balls are separated by a distance of nearly 120°; because of the reduction of a heavy processing appearance; and a reduction of the cooperation appearance; together, the rigidity of the shaft-bearing system is improved; and the maximum three and the minimum three The grain ball is nearly equidistantly spread; the axis reversal accuracy is improved; therefore, the accuracy requirements of the instrument are satisfied.
In the future, we understand the progress of imported bearings. Trust will have a lot of harvests in our application.
How to choose the imported bearing based on the conflicting torque? Is the conflicting torque of the imported bearing? If you choose an imported bearing based on its conflicting torque? These are not difficult to understand and grasp; today we will share the common sense in this area. The conflict of imported bearings is mainly caused by the rolling conflict and sliding conflict between the rolling body and the ferrule raceway, the cage and the rolling body and the sleeve Sliding conflict between the ring guiding faces (sliding conflict between the rolling elements without the cage), sliding conflict between the roller end faces and the ferrule side faces, viscous resistance of the smoothing agent, sliding conflict of the sealing device, etc. The composition of the aspect; its size depends on the bearing type, scale, load, speed, smoothness, sealing and other factors.
In instruments and machinery that require low collision torque; deep groove ball bearings, cylindrical roller bearings and self-aligning ball bearings are generally used; to accept radial load, single row thrust ball bearings are used to receive bearing load; if combined load is accepted; Select the angular touch ball bearing; the load angle and the touch angle are all together; the minimum conflict torque can be obtained, if the distance between the two corners is too large; the centripetal and thrust bearing assembly methods can be used to deal with.
When using imported bearings with low conflict torque; the design of the structure should be prevented from using touch-type sealing equipment. Together; the method of smoothing the bearing with low collision torque; smooth drop oil, smooth oil mist and smooth oil and gas should be used.
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