압연롤 검사를 위한 다중 센서 와전류 탐상 검사 시스템 개발

다국어 초록 (Multilingual 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.

참고문헌 (Reference)

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3 Theodoulidis, T. P., "Model of Ferrite-Cored Probes for Eddy Current Nondestructive Evaluation" 93 (93): 3071-3078, 2003

4 Drobne, M, "Fatigue Crack Growth and Fracture Mechanics Analysis of a Working Roll Surface Layer Material" 53 (53): 481-484, 2014

5 Hurley, D. C, "Eddy Current Arrays for Defect Detection" 28 : 1137-1144, 1992

6 Stucky, P. A., "Diffusion Effects in Eddy Current Nondestructive Evaluation" Iowa State University 1991