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KR-102962991-B1 - STEEL INSPECTION METHODS

KR102962991B1KR 102962991 B1KR102962991 B1KR 102962991B1KR-102962991-B1

Abstract

The present invention provides a steel inspection device and method capable of accurately and quickly measuring and determining the dimensions or degree of bending deformation of steel. The steel inspection device and method acquire images of a plurality of unit inspection areas spaced apart in the longitudinal direction of the steel, detect position information of the plurality of unit inspection areas based on the acquired images, calculate deformation information of the steel based on the detected position information of the plurality of unit inspection areas, and determine whether the steel is defective based on the calculated deformation information of the steel. At this time, the position information of the plurality of unit inspection areas is detected from the set inclination angles of the illumination light and reflected light, and the offset values of the center line of the captured image and the center line of the reflected light image reflected from the unit inspection area.

Inventors

  • 이광준
  • 박정규

Assignees

  • 주식회사 러닝비전

Dates

Publication Date
20260512
Application Date
20241021

Claims (9)

  1. A step of acquiring a captured image by irradiating illumination light toward a plurality of unit inspection areas spaced apart in the longitudinal direction of the steel material, and receiving reflected light reflected from the unit inspection areas to acquire a captured image for each of the plurality of unit inspection areas; A position information detection step for detecting position information for each of the plurality of unit inspection areas based on the acquired captured image; A deformation information calculation step for calculating deformation information of steel based on the detected location information for each of the plurality of unit inspection areas; and It includes a defect determination step for determining whether there is a defect in the steel based on the deformation information of the calculated steel, and The above position information detection step detects the position information of the unit inspection area based on the inclination angles of the illumination light and the reflected light, and the offset values of the center line of the captured image and the center line of the reflected light image reflected from the unit inspection area. Prior to the above-mentioned image acquisition step, the method further includes a first setting step for setting the inclination angle, and The above first setting step is, A first inspection specimen preparation step of preparing a first inspection specimen having a first surface that matches a preset reference inspection line and a second surface spaced apart from the first surface by a first thickness, and A first inspection specimen image acquisition step of irradiating illumination light toward the first inspection specimen and receiving reflected light reflected from the second surface to acquire a first inspection specimen image, and It includes a first inclination angle calculation step for calculating the first inclination angle formed by the illumination light and the reflected light by using a triangulation method that substitutes the offset value of the center line of the center line of the first inspection specimen image obtained and the center line of the reflected light image reflected from the second surface and the first thickness. A steel inspection method characterized by setting the first inclination angle to the inclination angle.
  2. In paragraph 1, The above position information detection step calculates position deviation values for each of the plurality of unit inspection areas for a preset reference inspection line using a triangulation method in which the inclination angle and the offset value are applied, and A steel inspection method characterized in that the deformation information calculation step calculates bending deformation information of one inspection line of the steel material in which the plurality of unit inspection areas are arranged, based on the plurality of position deviation values calculated for each of the plurality of unit inspection areas.
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  5. In paragraph 1, The above first setting step is, A second inspection specimen preparation step of preparing a second inspection specimen having a third surface that aligns with the above reference inspection line and a fourth surface spaced apart from the third surface by a second thickness different from the first thickness, and A step for acquiring a second inspection specimen image by irradiating illumination light toward the second inspection specimen and receiving reflected light reflected from the fourth surface to acquire a second inspection specimen image, and It includes a second inclination angle calculation step for calculating the second inclination angle formed by the illumination light and the reflected light by using a triangulation method that substitutes the offset value of the center line of the center line of the reflected light image reflected from the fourth surface and the second thickness of the acquired second inspection specimen image, and A steel inspection method characterized by setting the average value of the first inclination angle and the second inclination angle as the inclination angle.
  6. In paragraph 1, A steel inspection method characterized by further including a second setting step for setting the position of a shooting unit that receives reflected light prior to the above-mentioned image acquisition step.
  7. In paragraph 6, The above second setting step is, A screen placement step for arranging the screen such that a laser point matching a preset reference inspection line passes through a reference point, and A screen image acquisition step of irradiating illumination light toward a reference point on the screen so as to intersect the laser point, and receiving reflected light reflected from the screen to acquire a screen image, and A steel inspection method characterized by including a step of adjusting the position of the shooting unit so that the center point of the center line of the acquired screen-captured image coincides with the reference point of the screen through which the laser point passes.
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Description

Steel Inspection Methods The present invention relates to a steel inspection device and method, and more specifically, to a steel inspection device and method for inspecting the dimensions or bending deformation of steel materials such as H-shaped steel. Steel materials widely used in the fields of construction, civil engineering, and industrial facilities fundamentally require dimensional control during the manufacturing or product shipment process. Due to the diverse shapes of steel materials such as H-shaped steel, dimensional measurement was conventionally mostly performed manually using tools like calipers. Consequently, there were issues with insufficient reproducibility and long measurement times caused by individual variations in measurement. To this end, various technologies for automatically measuring the dimensions of steel are being developed. For example, there is a transmission method that projects radiation or light onto steel and determines the thickness of the steel based on the amount of attenuation. However, this transmission method has the problem that it cannot measure dimensions other than the thickness of the steel or bending deformation, and the equipment cost is also high. In addition to this, there is a method of detecting not only the thickness of the steel but also its dimensions and degree of bending deformation from the detected values measured by the laser rangefinder using a laser rangefinder installed on a stage that moves along the longitudinal direction of the steel. However, this method requires additional equipment such as a laser rangefinder and a stage drive system to move the steel, which increases equipment costs and raises concerns about a higher frequency of failures. Moreover, there is a problem in that the precision of the laser rangefinder decreases depending on whether the stage drive system is operating, leading to measurement errors. Therefore, a new inspection technology is required that can more quickly and accurately measure the dimensions or bending deformation of steel materials with various cross-sectional shapes, such as H-shaped steel. FIG. 1 is an exemplary diagram showing a steel inspection device according to one embodiment of the present invention. FIG. 2 is an illustrative diagram for explaining the criteria for determining whether a steel material has defects according to one embodiment of the present invention. FIG. 3 is an exemplary diagram showing an H-shaped steel inspection process according to one embodiment of the present invention. FIG. 4 is a block flowchart of a steel inspection method according to one embodiment of the present invention. Figure 5 is an example diagram illustrating the process of acquiring a captured image when the inspection line of the steel material coincides with the reference inspection line during the image acquisition step of Figure 4. Figure 6 is an example diagram illustrating the process of acquiring a captured image when the inspection line of the steel material is inconsistent with the reference inspection line during the image acquisition step of Figure 4. FIG. 7 is a block flowchart of a steel inspection method according to another embodiment of the present invention. FIG. 8 is an example diagram for explaining the first setting step of FIG. 7. FIG. 9 is an example diagram for explaining the second setting step of FIG. 7. The present invention will be described below with reference to the attached drawings. However, the present invention may be implemented in various different forms and is therefore not limited to the embodiments described herein. Furthermore, in order to clearly explain the present invention in the drawings, parts unrelated to the explanation have been omitted, and similar parts throughout the specification have been given similar reference numerals. Throughout the specification, when it is stated that a part is "connected (connected, in contact, combined)" with another part, this includes not only cases where they are "directly connected," but also cases where they are "indirectly connected" with other members interposed between them. Furthermore, when it is stated that a part "includes" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but rather allows for the inclusion of additional components. The terms used herein are merely for describing specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as “comprising” or “having” are intended to indicate the presence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. Embodiments of the present invention will b