Round steel material marking detection device and detection method, and method for manufacturing steel material

Abstract

Provided are a round steel material marking detection device and detection method, and a method for manufacturing a steel material, with which the risk of a marking being missed is significantly reduced by detecting markings automatically. A round steel material marking detection device (1) detects a marking (M) that has been applied at the position of a surface flaw on a round steel material (S). The marking detection device (1) is provided with an image capturing device (3) which captures images of a prescribed position (P) in the circumferential direction on the surface of the round steel material (S), which is rotating in a circumferential direction, with a prescribed period and with a resolution smaller than the dimension of the marking (M) being a measurement target; an image processing unit (8) which processes an image obtained by joining, in the circumferential direction, the images of the prescribed position (P) captured by the image capturing device (3); and a marking extraction unit (9) which extracts the marking (M) from the image that has been subjected to image processing by the image processing unit (8).

Description

technical field [0001] The present invention relates to a marking detection device and detection method of round steel, and particularly relates to the detection of surface flaws on the surface of round steel billet / round bar steel, steel pipe, etc. Apparatus and methods for labeling for detection. In addition, the present invention relates to a method of manufacturing a steel material, and particularly to a method of manufacturing a steel material including a flaw on the ground surface using the above-mentioned mark detection method. Background technique [0002] Generally, a round steel sheet (for example, a round steel billet) having a circular cross section is directly produced by casting, or is produced by subjecting a cast steel sheet to billet rolling. Also, the round steel sheet often has some flaws (casting flaws, holes, linear flaws, cutting flaws, etc.) on the surface during its manufacturing process. These scars become obstacles in subsequent processes. That i...

AI Technical Summary

Problems solved by technology

That is, for example, when a round steel sheet is hot-rolled, problems such as remaining scars causing these defects on the hot-rolled steel material, or cracking of the steel material during hot rolling, etc.

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