Rotational Speed and Transducer Frequency as Factors Affecting Possibility to Detect Defects in Axisymmetric Elements with a Method of Eddy Currents

Zbrowski, A.; Jóźwik, Wojciech

doi:10.1007/978-3-319-15835-8_37

Cited by 1 publication

(3 citation statements)

References 5 publications

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“…The basic reason for it is the fact that the defect identified from the outside is a surface defect giving a much higher signal than the same defect that is a subsurface defect. In addition, during the study of the inner surface, the front of the measuring head is moved from the test surface (for the geometry of the head and ring the distance is 0.6 mm), which weakens the signal of the defect by 50% [9].…”

Section: Test Resultsmentioning

confidence: 99%

“…In the previous studies, it was found that, during the tests, the measuring head should be in contact with the test object [8]. The test should be performed at the operating transducer frequency of 0.06kHz [9]. The low-frequency transducer enables research in a wider field, so that it is possible to detect subsurface defects [10,11].…”

Section: The Aim Of the Study And Testing Instrumentsmentioning

confidence: 99%

“…The automatic testing machine developed by the Institute for Sustainable Technologies -National Research Institute is dedicated to quality control of tapered roller bearing rings with an efficiency of 6 pcs/min [13]. The previous work has shown that the increase in the rotational speed of the ring facilitates the detection of defects in material [9]. A speed of 60 rev/min enabled the correct detection of material discontinuity, vibration reduction of the measurement system, and the anticipated inspection productivity.…”

Section: The Aim Of the Study And Testing Instrumentsmentioning

confidence: 99%

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Influence of Geometrical Features of Material Defects on the Identification Level by the Eddy Current Method

Jóźwik

Samborski

2015

SSP

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The article presents the results of the influence of geometrical features of defects in materials on the level of identification by the eddy current method. The study involved the inner ring of the tapered roller bearing. Four test defects, located at a constant distance from the inner surface, and a subsurface marker defect were performed in the treadmill of the tested ring. The test defects had a constant cross-sectional area in a perpendicular direction to the surface of the eddy current head. The geometrical features of each defect were the following: shape, the perimeter of the defect projected onto the surface of the ring, and the width and height of the defect projected on the face of the measuring head. The study involved an inner surface (subsurface defect detection) and external surface (the study of surface defects). It has been shown that the shape of the defect affects the level of detection using the eddy current method.

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Section: Test Resultsmentioning

confidence: 99%