| 摘要 |
PROBLEM TO BE SOLVED: To provide a method capable of efficiently and surely removing surface defects such as scabs generated on a steel plate. SOLUTION: A defect inspecting device 12 is arranged on a steel plate, defects are detected, defects are cut and worked by a cutting tool, an ultrasonic cutting tool or a milling cutting tool, a rolling is performed by a rolling machine 13 and working traces are erased. As a result, surface defects of the steel plate are completely removed. By adding grinding working by a magnetic working device before the rolling is performed after defects are cut and worked, a further excellent surface can be obtained. By adjusting roughness of working traces, generation of patterns after the rolling can be suppressed.
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