Automatic magnetic flux leakage testing probe for hub bearing spinning surfaces

Abstract

The invention discloses an automatic magnetic flux leakage testing probe for hub bearing spinning surfaces. The probe comprises a magnetic flux leakage testing magnetizer and a testing probe component, wherein the magnetic flux leakage testing magnetizer comprises a U-shaped magnet yoke and a pole shoe guide sleeve, magnetizing coils wind around two side plates of the U-shaped magnet yoke, the pole shoe guide sleeve is mounted at tops of the two side plates of the U-shaped magnet yoke, a through groove is formed in an axially symmetric position of the pole shoe guide sleeve, and two side surfaces of the through groove form two pole planes; the testing probe component is embedded between the two pole planes and comprises a probe core and a probe shoe for mounting the probe core, the probe core adopts a plate-like structure, two cambered grooves matched with the hub bearing spinning surfaces are symmetrically formed in the probe core, and micro magnetic heads for performing magnetic flux leakage testing on the hub bearing spinning surfaces are embedded in the cambered grooves. A direct-current magnetic flux leakage technology is adopted, in cooperation with the pole shoe guide sleeve which is in small-clearance meshing with the spinning surfaces, high-sensitivity arrayed micro magnetic heads are adopted to pick up weak magnetic flux leakage field information, and the probe has the advantages of high testing sensitivity, high stability and the like.

Description

technical field [0001] The invention belongs to the field of non-destructive detection of the spinning surface of the hub bearing, and more specifically relates to an automatic magnetic flux leakage detection probe for the spinning surface of the hub bearing. Background technique [0002] Wheel bearings are one of the key parts of automobiles. The third generation of wheel bearings uses spinning technology to assemble all parts into one body. The integrity of the parts has been improved, and the installation and maintenance are convenient and reliable for users. Spinning is the key assembly process of the third-generation hub bearing. The bearing inner ring 1, outer ring 2, rollers and other accessories are assembled into one body through the spinning process. The deformation of the inner ring parts of the bearing during the spinning process and after spinning is as follows: figure 1 with figure 2 As shown, the end of the inner ring of the bearing after spinning is a spinn...

AI Technical Summary

Problems solved by technology

Since the spinning surface is a spatial curved surface and the crack depth is shallow, ultrasonic testing is difficult to adapt to

Lubricating oil is encapsulated inside the bearing after spinning, and the magnetic suspension fluid for magnetic particle testing will destroy the internal grease of the hub bearing, so magnetic particle testing is difficult to adapt to the non-destructive testing of hub bearings

The eddy current probe with profiling structure can detect the cracks on the outer surface of the hub bearing, but due to the skin effect of the eddy current flaw detection, the nondestructive testing of the spinning surface of the hub bearing using the eddy current method can only detect the spinning surface and near-surface defects. Unable to detect cracks inside the material and on the back of the spinning process, which can easily lead to missed reports, and judge unqualified products as qualified products, which will bring hidden dangers to the safe driving of cars

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