Ways to improve the accuracy of bearing units

Source: Bearing network time: 2014-08-31

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1. One way to improve the accuracy of the bearing is to produce a beautiful instrument; the main shaft is used with 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; Measured in detail; every three sets of scales; each set of steel balls takes a distance of nearly 120Â°; because it adds a heavy processing appearance; it adds a cooperating appearance; together, it improves the stiffness of the shaft-bearing system. And the maximum three particles and the smallest three steel balls are spread nearly equidistantly; the axis reversal accuracy is improved; so the accuracy requirement of the instrument is satisfied.
2. The precision progressive method bearing is finished after the end of the device 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 performed successively; it can be found that after passing the certain number of revolutions; Approximate repetitive rendering. The target for measuring the degree of such change is the cyclic rotation precision; changing the number of revolutions required to approximately repeatedly render represents the "quasi-period" of the cyclic rotation precision; the magnitude of the magnitude change in the quasi-period is large; Poor rotation accuracy for the cycle.
For example, the preload is properly applied to the main shaft; the rotational speed is gradually reduced to near the responsible rotational speed; to achieve the "run-in" effect of the bearing; the cycle rotation accuracy of the main shaft can be improved.

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