| 摘要 |
PROBLEM TO BE SOLVED: To quickly detect defects on the entire surface of a material to be inspected and furthermore defects in any direction in a magnetic particle inspection. SOLUTION: The magnetic particle inspection method mainly includes: a process for inserting a current penetration electrode into a hole that is in the thickness direction and is formed in the material to be inspected for energizing a DC current and energizing an AC current to magnetization coils arranged on both the sides of the material to be inspected; a process for spraying a magnetic particle liquid onto the surface of the material to be inspected; and a process for demagnetizing the material to be inspected. The magnetic particle inspection apparatus is provided with the current penetration electrode that is inserted in the shaft hole of an annular body and energizes the DC current; the magnetization coils that are oppositely arranged on both the sides of the annular body and energizes the AC current; and a nozzle for spraying the magnetic particle liquid to the annular body. As a result, the defects in any direction on the entire surface of the material to be inspected can be quickly detected. COPYRIGHT: (C)2004,JPO
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