Analysis bearing inner and outer ring standard matching

First of all, check the matching instrument with the bearing inner and outer groove diameter standard parts. Because the matching instrument is measured by the two-point comparison method, so the calibration instrument needs two standard parts, namely, the inner ring, the outer ring groove diameter standard parts. The instrument is equipped with three dial gauges. The left and right dial gauges reflect the diameter deviation of the inner and outer groove respectively, and the middle dial meter reflects the value of (x-y) at one time.

For example, if the actual diameter deviation of the channel of the outer ring standard parts is +8 um, and the actual diameter deviation of the channel of the inner ring standard parts is -5um, then x-y=+8-(-5)=13um.

During calibration, the internal and external channel diameter standard parts should be aligned with their respective measuring points. The pointer of a dial meter in the middle of the matching instrument should refer to the position of +13 um to prove that the instrument has been calibrated. On the contrary, the dial indicator pointer does not indicate the +13 um position, the need to readjust the instrument.

Since the inner and outer groove diameters have been sorted before matching, the dial gauges on the left and right sides of the matching instrument can be omitted. Only one dial meter in the middle reflects the value of (x-y), and a steel ball of a certain size can be selected. In this way, the radial clearance value of the bearing meets high standard requirements.

It should be reminded that, in the process of supporting the inner and outer rings, we should insist on frequently using standard parts to check the instrument and prevent running off the table. Otherwise, the measured (X-Y value is not accurate, and the bearing clearance value will be wrong. In the application effect, promote the use of matching instrument, qualified rate can reach 98-100%.