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Sensors 2017, 17(12), 2814; doi:10.3390/s17122814

Application of a Saddle-Type Eddy Current Sensor in Steel Ball Surface-Defect Inspection

College of Mechanical and electronic Engineering, Shandong University of Science and Technology, Qingdao 266590, China
College of Transportation, Shandong University of Science and Technology, Qingdao 266590, China
College of Electrical Engineering and Automation, Shandong University of Science and Technology, Qingdao 266590, China
Authors to whom correspondence should be addressed.
Received: 17 November 2017 / Revised: 2 December 2017 / Accepted: 4 December 2017 / Published: 5 December 2017
(This article belongs to the Special Issue Magnetic Sensors and Their Applications)
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Steel ball surface-defect inspection was performed by using a new saddle-type eddy current sensor (SECS), which included a saddle coil and a signal conditioning circuit. The saddle coil was directly wound on the steel ball’s outer bracket in a semi-circumferential direction. Driven by a friction wheel, the test steel ball rotated in a one-dimensional direction, such that the steel ball surface was fully scanned by the SECS. There were two purposes for using the SECS in the steel ball inspection system: one was to reduce the complexity of the unfolding wheel of the surface deployment mechanism, and the other was to reduce the difficulty of sensor processing and installation. Experiments were carried out on bearing steel balls in diameter of 8 mm with three types of representative and typical defects by using the SECS, and the results showed that the inspection system can detect surface defects as small as 0.05 mm in width and 0.1 mm in depth with high-repetition detection accuracy, and the detection efficiency of 5 pcs/s, which meet the requirement for inspecting ISO grade 10 bearing steel balls. The feasibility of detecting steel ball surface defects by SECS was verified. View Full-Text
Keywords: steel ball; saddle-type eddy current sensor; defects steel ball; saddle-type eddy current sensor; defects

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Zhang, H.; Zhong, M.; Xie, F.; Cao, M. Application of a Saddle-Type Eddy Current Sensor in Steel Ball Surface-Defect Inspection. Sensors 2017, 17, 2814.

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