Surface inspection method, surface inspection device, manufacturing system, method of identifying defect formed area, and manufacturing method of steel pipe
AssigneeJfe Steel Corporation
InventorsYukinori Iizuka, Hiroaki Ono, Toshifumi Kodama, Akihiro Ogawa
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Abstract
A surface inspection method for a steel pipe detects a surface defect on a hot steel pipe, and includes: an imaging step of imaging a self-luminous image of the hot steel pipe; a correcting step of making more uniform luminance variation in a circumferential direction of the self-luminous image and correcting the self-luminous image; and a detecting step of detecting a surface defect based on the self-luminous image corrected at the correcting step.
Claims10
A surface inspection method for inspecting a steel pipe emitting light as a result of hot rolling, the method comprising:
- imaging a self-luminous image of a surface of the steel pipe in longitudinal direction and circumferential direction after the hot rolling, luminance of the self-luminous image depending on a surface temperature of the steel pipe;
- correcting the luminance of the self-luminous image by making variation in the luminance more uniform in a circumferential direction of the self-luminous image;
- and
- detecting a surface defect based on the self-luminous image whose luminance has been corrected.
A surface inspection device for inspecting a steel pipe emitting light as a result of heating, the device comprising:
- an imaging device configured to capture a self-luminous image of a surface of the steel pipe, luminance of the self-luminous image depending on a surface temperature of the steel pipe;
- a correcting device configured to correct the luminance of the self-luminous image by making variation in the luminance more uniform in a circumferential direction of the self-luminous image;
- and
- a detecting device configured to detect a surface defect based on the self-luminous image whose luminance has been corrected.
Dependencies are inferred from the claim text.