Method and apparatus for detecting miniature bearing ferrule 45 degrees inner chamfer angle rapidly and accurately

Abstract

The invention relates to a method for fast and accurately measuring a 45-degree inner bevel of a miniature bearing ring. According to the principle that the two right-angle sides of a 45-degree chamfer angle are of the same length, a method of comparing with a standard element, the inner bevel of which is C1*45 degrees, is adopted, and the actual chamfer angle of the inner ring to be measured is measured fast and accurately by moving a 90-degree gauge head up and down. A measuring device consists of a base 1, a bracket 2, a dial test indicator 3, the 90-degree gauge head 4 and a standard element or an inner ring to be measured 5; the base is fixed with a pole bracket; the bracket is provided with the dial test indicator, measuring range of which is 0-5mm; the checked 90-degree gauge head is arranged on the dial test indicator; and the base below the 90-degree gauge head is used for placing the standard element or the inner ring to be measured. The dial test indicator is adjusted to zero position, if the size of a semi-finished inner ring chamfer angle is 0.2mm with the tolerance of 0 to +0.05mm, the inner bevel of the finished inner ring to be measured is 0.1mm which is within the tolerance of -0.02 to +0.03mm.

Description

technical field [0001] The invention belongs to the technical field of bearing detection, in particular to a fast and accurate detection method and device for a 45° inner chamfer of a miniature bearing ring. Background technique [0002] In the process of machining the inner ring of miniature bearings with an inner hole below Φ5mm, the 45° assembly chamfer is an important index with strict tolerance requirements (generally 0.05mm). The process is generally arranged before other surface finishing processes such as plane, outer circle, inner hole, channel, etc. Therefore, when preparing the process, such as figure 1 The calculated process dimension C1 of inner chamfer finishing shown by the thick solid line in , after the surface finish machining of plane and inner hole, etc., the remaining part should fall within the chamfer dimension C of product design and its tolerance range . [0003] Because the size of the inner hole of the inner ring of the miniature bearing is too s...

AI Technical Summary

Problems solved by technology

Under the above conditions, the coaxiality between the inner chamfer and the outer circle can be guaranteed when chamfering, but because the coaxiality between the inner hole and the outer circle is poor, the coaxiality with the inner hole cannot be guaranteed, so chamfering is prone to occur. The coordinate dimensions C1 and C1 in the direction of the angular circle are quite different, such as image 3 shown

[0005] The detection of the inner chamfer size C1 is mainly carried out in the reading microscope, such as image 3 As shown, the measurement reference is the inner hole of the bearing ring, which causes the inconsistency of the processing reference and measurement, making it difficult to determine whether the inner chamfer dimensions C1 and C1 can meet the final chamfer size C and its tolerance requirements during inspection

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