Echrif, Salah B. M.

Hrairi, Meftah

Rizal, Mohd Shah

English

The International Islamic University Malaysia Repository

Automatic magnetic particle system for inspectionChapter 25Development ofautomatic magnetic particle system for automotive parts inspectionMeftah Hrairi, Mohd Shah Bin Rizal, Salah EchrifDepartment of Mechanical Engineering, Faculty of Engineering,International Islamic University MalaysiaIntroductionIn manual Magnetic Particle Inspection (MPI), achieving zero-defect principles in qualitymanagement concerning the inspection reliability, such as very lov"l false negative rate inorder to avoid pseudo scrap, cannot be satisfactorily attained [1]. Therefore, processingtechniques such as magnetization, spraying of magnetic ink, black-light illuminating, opticalpickup of the magnetic particle indication and analysis ofthese by machine vision procedureslike pattern segmentation and recognition need to be automated. This also includessupervising procedures like control of the black-light intensity and/or the quality of the liquidpO\vder suspension, such as rate of powder deterioration by separation of powder and thefluorescent color. Other components and applications for automated magnetic particleinspection have been suggested [2-10]. Since MPI is still the most sensitive surface crackinspection method, variability of human interpretation and variation in components canreduce the reliability of magnetic particle inspection flaw detection to only about 70%. Hencethe need for an on line, heavy duty, high speed parts inspection with on line documentationand near 100 percent fla\v detectability within calibrated equipment, if possible, by usingmodern electronic systems that can also achieve lower costs [2].This chapter describes d1e development and incorporation of an automated system into anexisting manual MPI machine. This automated setup will be comprised of a magnetic testingmachine, a machine vision structure, and self-controlling system.Magnetic Particle InspectionMagnetic particle inspection is a nondestructive method for the detection of defects inferromagnetic materials. Application of a magnetic field or current flow through the materialis used in combination with the principle that the magnetic susceptibility of a defect ismarkedly poorer (the magnetic resistance is greater) than that of the surrounding material. Intheory, magnetic particle testing is a relatively simple concept. It can be considered as a160

Development of automatic magnetic particle system for automotive parts inspection

http://irep.iium.edu.my/19669/1/Chapter_25.pdf

Development of automatic magnetic particle system for automotive parts inspection

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