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Ways to improve the precision of imported bearings
Source: Bearing network time: 2018-06-14
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1. After the end of the installation of the bearing in the main unit; 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, when measuring continuously; it can be found that after passing a 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.
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