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http://dx.doi.org/10.7735/ksmte.2017.26.3.306

Development of Multi-channel Eddy Current System for Inspection of Press Rolls  

Lee, Jae-Ho (The Graduate School of NID Fusion Technology, Seoul National University of Science & Technology)
Park, Tae-Sung (Department of Mechanical & Automotive Engineering, Seoul National University of Science & Technology)
Park, Ik-Keun (Department of Mechanical & Automotive Engineering, Seoul National University of Science & Technology)
Publication Information
Journal of the Korean Society of Manufacturing Technology Engineers / v.26, no.3, 2017 , pp. 306-312 More about this Journal
Abstract
Press rolls are constantly exposed to physical and heat stresses on their surface and are prone to crack, bruise, and spall if the accumulated stress goes beyond the critical point. Such surface phenomenon can cause them to lose their functionality and eventually lead to a halted production line. Eddy current testing can be considered a useful method to investigate the surface of the roll. The method involves the application of a high intensity magnetic field onto the surface of the roll, and thereby finding any early stage of possible defects. When the method was applied for roll inspection, the cross section of the sensor was regulated as per the overall testing speed. A smaller cross sectional area implied a better resolution but a longer testing time. In this paper, a convenient method to increase both overall system resolution and inspection speed of eddy current roll inspection is suggested by using a devised array sensor structure.
Keywords
Eddy current testing; Array sensor; Press roll; Surface examination; Bruise;
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  • Reference
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