A method of magnetic particle flaw detection for pressed bearings

Abstract

The present invention discloses a pressing bearing magnetic particle testing method, which comprises that: a stand is placed on a magnetic particle testing machine, a layer of a nylon insulation plate is paved on the stand, and then a pressing bearing to be detected is placed on the nylon insulation plate; two rectangular half-coils are vertically arranged on the nylon insulation plate, are arranged in a cross manner, and cover outside the pressing bearing, both ends of each rectangular half-coil are exposed, and the rectangular half-coils are pressed below the pressing bearing to form a closed circuit; a magnetization rod is arranged between the two rectangular half-coils and the pressing bearing in a penetration manner, testing sensitivity test sheets are respectively adhered on the edge of the pressing bearing surface, and primary testing detection is performed; and after the primary testing detection is completed, the pressing bearing is turned over, and secondary testing detection is performed, wherein the pressing bearing magnetic particle testing detection is completed after completing the secondary testing detection. According to the present invention, the cross induced current method is used so as to complete the magnetization testing in the two direction of the pressing bearing surface in one time.

Description

technical field [0001] The invention belongs to the field of bearing flaw detection, and mainly relates to a magnetic particle flaw detection method for pressing down a bearing. Background technique [0002] Magnetic particle testing is an effective non-destructive flaw detection method. Generally, the flaw detectors purchased in bearing factories are aimed at the hollow structure of bearings, and use the rod-through method and the induced current method to perform composite magnetization flaw detection. However, some bearing parts, such as pressed bearings, have only a small hoisting hole in the center, so it is impossible to carry out rod-piercing flaw detection. The traditional alternative flaw detection method is: penetration method. But infiltration has its inherent drawbacks. 1. Time-consuming and labor-intensive. Penetration testing needs to go through the following procedures: initial surface cleaning, penetration time, cleaning time after penetration, imaging tim...

AI Technical Summary

Problems solved by technology

2. Pollution of the environment and harmful to health

3. High cost

Moreover, the detection area is limited

4. Low detection sensitivity

In the usual flaw detection process, the penetrant method is not as sensitive as the magnetic flaw detection method

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