Method for measuring deviation of nominal size of bore diameter of bearing inner ring

Abstract

Disclosed is a method for measuring the deviation of the nominal size of the bore diameter of a bearing inner ring. The measuring device is composed of a first positioning ball (1), a positioning sleeve (2), a pressure spring (3), a cover plate (4), a measuring instrument (5), a measuring rod (6), a balancing rack (7), a second positioning ball (8), a positioning sleeve (9) and a radial moving positioning ball (10). Reference calibration is based on h=r-1 / 2(4r2-C3)1 / 2, a first standard block (11), a second standard block (12), a third standard block (13) are provided, and an original value is obtained. The distance between two points where first positioning ball and the second positioning ball contact with the bearing inner ring is equal to the chord length of the bearing inner ring with a bore diameter of 2r, a height difference h formed by the connecting line of the horizontal line of the contact point of the radial moving positioning ball and the inner ring bearing, and the distance of the two points is equal to the chord height of the bearing inner ring with a bore diameter of 2r, so that the difference between the measuring value and the original value is the deviation of the nominal size of the bore diameter of the bearing inner ring.

Description

technical field [0001] The invention belongs to the technical field of bearing measurement, in particular to a method for measuring the nominal size deviation of the inner diameter of the bearing inner ring. Background technique [0002] For bearings with larger specifications, the measurement of the nominal size deviation of the inner ring inner diameter usually uses a pipe ruler or an inner diameter micrometer. The measurement accuracy and accuracy of the nominal size deviation of the inner ring inner diameter of the bearing are directly related to various performance indicators of the finished bearing. It is also related to the fit tolerance of the matching parts with the inner ring of the bearing. [0003] The measurement of the tube ruler is to use a hollow stainless steel tube, one end is connected with a ball head similar to half a steel ball, and the other end is fixed with a dial indicator. After adjusting the size of the tube ruler on the standard measuring instrum...

AI Technical Summary

Problems solved by technology

[0004] Although the above-mentioned method of measuring the inner diameter of the bearing inner ring with a pipe ruler or an inner micrometer is intuitive and easy to operate, the deflection of the hollow steel pipe will inevitably affect the accuracy of the measurement, and two people are required to cooperate to complete the measurement, which requires a large amount of labor. , lower work efficiency

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