How to improve the accuracy of INA bearings?
2019-10-12 07:05:54
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How to improve the accuracy of INA bearings?
Source: China Bearing Network Time: 2014-07-29
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1. The INA bearing is in the main unit after the end of the device; 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 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; For the cycle rotation accuracy is poor. For example, the proper preload of the spindle; the speed is gradually increased to the near working speed; to achieve the "run-in" effect of the INA bearing; can improve the cycle rotation accuracy of the spindle.
2, a factory trial production of precision instruments; spindle with 6202 / P2 type INA bearing and its accuracy is still not satisfactory; after the thickening of the journal and on which the raceway is made to replace the inner ring; and the steel ball is carefully measured; Each group of steel balls is divided into three groups; each group of steel balls is separated by a distance of nearly 120°; because it reduces the appearance of a heavy machining; it also reduces the cooperation appearance; together, it improves the rigidity of the shaft-INA bearing system; The grain and the smallest three steel balls are nearly equidistantly distributed; the axis reversal accuracy is improved; therefore, the accuracy requirement of the instrument is satisfied.
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