The Evaluation on the Feasibility of the Defect Inspection of Annular Ferrite Magnet

• Main Authors: Hou Chung Chien, 侯仲謙
• Other Authors: Fang-Zhi Tien
• Format: Others
• Online Access: http://ndltd.ncl.edu.tw/handle/rduj9n

碩士 === 國立臺北科技大學 === 工業工程與管理系EMBA班 === 104 === Ferrite magnet is an important component to the motor, and the annular ferrite magnet is also being widely used in the area such as automotive and medical industries that require strictly on the product quality and safety. Therefore, the defect inspection of the annular ferrite magnet is indispensable to the process of product control. The traditional way of inspection is mostly using the raw human vision to sort the magnet flaws out, but however, relying on the raw human vision is easy to make undetected errors or misjudgments due to the cause of visual fatigue .Thus, with the alternative of automatic inspection by machine vision replacing the human visual inspection, outflows of adverse magnets and motor breakdowns caused by defective magnets will likely to be reduced. This paper will be evaluating the feasibility of methods of the defect inspection that detect flaws of the annular ferrite magnet under the following three categories: 1. Surface defects, 2. Surface cracks, 3. Surface impurities and other undesirables. The objective of this research paper is to evaluate the possibility of improving the accuracy of the annular ferrite magnet defect inspection and the efficiency of the productivity, and as well as to reduce the considerable labor cost and production time. The assessment indicates the machine vision is currently the most qualified method to operate the non-destructive testing on ferrite, but nevertheless, due to its dark, smooth, and barely-glisten surface, the further study on how to break the restriction of the light source in order to effectively detect the imperfections that are hardly visible for the naked eyes will be needed in the future.