US 2015/0316508 A1 · APPARATUS AND METHOD FOR DETECTING INNER DEFECTS OF STEEL PLATE

Abstract

An apparatus for detecting inner defects of a steel plate comprises an all-defect detection unit for detecting all defects including surface defects present on the surface of the steel plate and inner defects present inside the steel plate by intensity of leakage flux, measured by generating magnetic flux in a strike direction of the steel plate; a surface defect detection unit for detecting surface defects by intensity of leakage flux, measured by generating magnetic flux in the thickness direction of the steel plate, for a predetermined detection region including all the defects detected by the all-defect detection unit; and a data processing unit for detecting only inner defects present in a detection region by excluding the detected surface defects from all the defects detected by the all-defect detection unit, for the detection region, thereby detecting only the inner defects of the steel plate.

Claims14

Dependent claims

An apparatus for detecting internal defects of a steel plate, the apparatus comprising:

an overall defect detection unit detecting overall defects of a steel plate including surface defects existing on surfaces of the steel plate and internal defects existing inside the steel plate based on a degree of strength of leakage magnetic flux measured by generating magnetic flux in a direction of transfer of the steel plate;
a surface defect detection unit detecting the surface defects based on a degree of strength of leakage magnetic flux measured by generating magnetic flux in a thickness direction of the steel plate through a detection region in which the overall defects detected by the overall defect detection unit are located;
and
a data processing unit detecting only the internal defects existing in the detection region by subtracting the surface defects detected by the surface defect detection unit from the overall defects detected by the overall defect detection unit.

1 more element

A method for detecting internal defects of a steel plate, the method comprising:

detecting overall defects of a steel plate including surface defects existing on surfaces of the steel plate and internal defects existing inside the steel plate by using an overall defect detection unit based on a degree of strength of leakage magnetic flux measured by generating magnetic flux in a direction of transfer of the steel plate;
detecting the surface defects by using a surface defect detection unit based on a degree of strength of leakage magnetic flux measured by generating magnetic flux in a thickness direction of the steel plate through a detection region in which the overall defects detected by the overall defect detection unit are located;
and
detecting only the internal defects existing in the detection region by using a data processing unit by subtracting the surface defects detected by the surface defect detection unit from the overall defects detected by the overall defect detection unit.

1 more element

Dependencies are inferred from the claim text.

Apparatus and method for detecting inner defects of steel plate

Life of this patent

Apparatus and method for detecting inner defects of steel plate

Life of this patent

Abstract

Claims14