WO2020128572A1 - Method for detecting issues with coil eyes and a coil eye diameter measurement camera system therefor - Google Patents
Method for detecting issues with coil eyes and a coil eye diameter measurement camera system therefor Download PDFInfo
- Publication number
- WO2020128572A1 WO2020128572A1 PCT/IB2018/060239 IB2018060239W WO2020128572A1 WO 2020128572 A1 WO2020128572 A1 WO 2020128572A1 IB 2018060239 W IB2018060239 W IB 2018060239W WO 2020128572 A1 WO2020128572 A1 WO 2020128572A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- coil
- coils
- camera
- eye
- light source
- Prior art date
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
- G01N21/954—Inspecting the inner surface of hollow bodies, e.g. bores
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
- G01B11/2433—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures for measuring outlines by shadow casting
Definitions
- the present invention relates generally to steel coils. More specifically the invention relates to coil eye measurement of steel coils and most specifically to camera measurement systems for coil eye measurement of steel coils.
- Coil sagging occurs when the coiled strip does not have enough strength to support itself in this position. Coil sagging occurs during and after coiling and is due to a relative displacement of the coil wraps leading to a reduction of the coil inner (coil eye) diameter after the coil is removed from the mandrel.
- Coils with inside diameters that are too small may not load at the payoff reel. Conversely, diameters that are too big will cause the mandrel to over expand. Further, loose wraps or out-of-round coils can also cause loading issues, resulting in delays in steel mills.
- the present invention is a method for detecting steel coils having a misshapen coil eye and removing these coils from a production queue.
- the method comprises providing a queue of steel coils, which may be being conveyed on a coil conveying system. Each coil having a coil eye.
- Each coil is conveyed between the camera/light source and the retroreflector such that: i) the retroreflector is visible by the camera through the coil eye; and ii) light from the light source can pass through the coil eye.
- the light source is flashed and the light from the light source passes through the coil eye and reflects off the retroreflector.
- An image of the reflected light is captured using the camera. The image is analyzed to define the circumference of the coil eye and to determine the largest and smallest diameter of said coil eye. Then coils with misshapen eyes are removed from the queue.
- the coil conveying system may be a walking beam coil conveyor.
- the camera may be a high-resolution smart camera.
- the retroreflector may comprise a flat panel covered in reflective tape. The image may be saturated by the reflected light and the coil eye may appear as a white circle against a dark background thereby making the coil eye circumference well defined.
- the light source may be an LED ring light. Further, the coil eyed diameter that is 90 degrees perpendicular to the maximum diameter may also be measured.
- the step of removing coils may comprise removing the coils with a coil crane.
- Figure 1 depicts a system of useful in the method of the present invention
- Figure 2 further depicts a system of useful in the method of the present invention
- Figure 3 depicts a saturated image of the coil eye of a coil.
- the present invention is a system for automatically measuring the coil eye of steel coils to allow for removal of coils with misshapen coil eyes from the queue of continuous production steel mills.
- FIG. 1 depicts a system useful in the method of the present invention.
- Each coil 1 has a coil eye 2 that needs to be analyzed.
- the coils 1 are carried along a path toward the continuous production mill by coil conveyors 3 of some type.
- the coil conveying system may be a walking beam coil conveyor. As each coil 1 is conveyed, it will pass a point where a high-resolution smart camera 4 with some type of lighting (for example LED ring lighting) is mounted.
- Figure 2 depicts a system useful in the method of the present invention as a coil 1 passes in front of the camera 4.
- a picture of the side of the coil is taken under ambient light and a second picture is taken with the light source is activated.
- the light passes through the coil eye 2 when the light source is flashed.
- the camera is positioned such that it views through the coil eye 2 of each coil as they are indexed.
- a retroreflective panel 5 On the opposite side, behind the coil 1 , is a retroreflective panel 5. The strobed LED light bounces off from the panel 5 and directly back to the camera 4. This creates a bright backlight for the image of the coil 1. The reflected light saturates the image taken by the camera 4 and the coil eye 2 appears as a white circle, while the rest of the image is dark. This high contrast image makes the eye circumference well defined.
- Figure 3 depicts such a saturated second image.
- the second image is calibrated so that the minimum and maximum coil eye diameters can measured. Further, the diameter 90 degrees perpendicular to the maximum diameter is also measured.
- the minimum diameter is used to determine whether there is a clear eye that is within mandrel tolerance. For example, at one plant the minimum acceptable diameter of the coil eye is 700 mm.
- Another threshold of acceptability relates to the max diameter and the 90 degree to max diameter. If the difference between the max diameter and the 90 degree to max diameter is to large, the coil will be rejected a being too egg-shaped (excessive ovality). In the same plant as above, coils are rejected if the difference is larger than 50mm.
- Coils with loose inner wraps, latches, edge damage, and out-of-roundness can be easily identified. Coils 1 which have apparent issues are identified and coil images with measurements are recorded for a line operator. A decision can then quickly be made to remove any potentially problematic coils as needed. Coils may be removed by a coil crane.
Abstract
A method for detecting steel coils having a misshapen coil eye and removing these coils from a production queue. The method comprises providing a queue of steel coils, which may be being conveyed on a coil conveying system. Each coil having a coil eye. Providing a camera and light source for the camera. Providing a retroreflector to reflect light from said light source. The method includes the step of passing each coil between the camera/light source and the retroreflector. The light source is strobed, and light passes through the coil eye and is reflected back to the camera. The camera records a saturated image of the coil eye. The image is used to analyze the min/max diameters of the coil eye and coils with misshapen eyes may be rejected.
Description
Method for Detecting Issues with Coil Eves and a
Coil Eve Diameter Measurement Camera System Therefor
Field of the Invention
The present invention relates generally to steel coils. More specifically the invention relates to coil eye measurement of steel coils and most specifically to camera measurement systems for coil eye measurement of steel coils.
Background of the Invention
Coil sagging occurs when the coiled strip does not have enough strength to support itself in this position. Coil sagging occurs during and after coiling and is due to a relative displacement of the coil wraps leading to a reduction of the coil inner (coil eye) diameter after the coil is removed from the mandrel.
Coils with inside diameters that are too small may not load at the payoff reel. Conversely, diameters that are too big will cause the mandrel to over expand. Further, loose wraps or out-of-round coils can also cause loading issues, resulting in delays in steel mills.
Removing a coil stuck on a mandrel could result in hours of down time. There is need in the art for a system to mitigate the chance of loading a coil with a misshapen eye onto mandrels of payoff coils and the like.
Summary of the Invention
The present invention is a method for detecting steel coils having a misshapen coil eye and removing these coils from a production queue. The method comprises providing a queue of steel coils, which may be being conveyed on a coil conveying system. Each coil having a coil eye. Providing a camera and light source for the camera. Providing a retroreflector to reflect light from said light source.
Each coil is conveyed between the camera/light source and the retroreflector such that: i) the retroreflector is visible by the camera through the coil eye; and ii) light from the light source can pass through the coil eye. Next the light source is flashed and the light from the light source passes through the coil eye and reflects off the retroreflector. An image of the reflected light is captured using the camera. The image is analyzed to define the circumference of the coil eye and to determine the largest and smallest diameter of said coil eye. Then coils with misshapen eyes are removed from the queue.
The coil conveying system may be a walking beam coil conveyor. The camera may be a high-resolution smart camera. The retroreflector may comprise a flat panel covered in reflective tape. The image may be saturated by the reflected light and the coil eye may appear as a white circle against a dark background thereby making the coil eye circumference well defined. The light source may be an LED ring light. Further, the coil eyed diameter that is 90 degrees perpendicular to the maximum diameter may also be measured. The step of removing coils may comprise removing the coils with a coil crane.
Brief Description of the Figures
Figure 1 depicts a system of useful in the method of the present invention;
Figure 2 further depicts a system of useful in the method of the present invention;
Figure 3 depicts a saturated image of the coil eye of a coil.
Detailed Description of the Invention
The present invention is a system for automatically measuring the coil eye of steel coils to allow for removal of coils with misshapen coil eyes from the queue of continuous production steel mills.
Figure 1 depicts a system useful in the method of the present invention. Each coil 1 has a coil eye 2 that needs to be analyzed. The coils 1 are carried along a path toward the continuous production mill by coil conveyors 3 of some type. The coil conveying system may be a walking beam coil conveyor. As each coil 1 is conveyed, it will pass a point where a high-resolution smart camera 4 with some type of lighting (for example LED ring lighting) is mounted.
Figure 2 depicts a system useful in the method of the present invention as a coil 1 passes in front of the camera 4. When the coil 1 passes by the camera 4, a picture of the side of the coil is taken under ambient light and a second picture is taken with the light source is activated. The light passes through the coil eye 2 when the light source is flashed. The camera is positioned such that it views through the coil eye 2 of each coil as they are indexed.
On the opposite side, behind the coil 1 , is a retroreflective panel 5. The strobed LED light bounces off from the panel 5 and directly back to the camera 4. This creates
a bright backlight for the image of the coil 1. The reflected light saturates the image taken by the camera 4 and the coil eye 2 appears as a white circle, while the rest of the image is dark. This high contrast image makes the eye circumference well defined.
Figure 3 depicts such a saturated second image. The second image is calibrated so that the minimum and maximum coil eye diameters can measured. Further, the diameter 90 degrees perpendicular to the maximum diameter is also measured. The minimum diameter is used to determine whether there is a clear eye that is within mandrel tolerance. For example, at one plant the minimum acceptable diameter of the coil eye is 700 mm. Another threshold of acceptability relates to the max diameter and the 90 degree to max diameter. If the difference between the max diameter and the 90 degree to max diameter is to large, the coil will be rejected a being too egg-shaped (excessive ovality). In the same plant as above, coils are rejected if the difference is larger than 50mm.
Coils with loose inner wraps, latches, edge damage, and out-of-roundness can be easily identified. Coils 1 which have apparent issues are identified and coil images with measurements are recorded for a line operator. A decision can then quickly be made to remove any potentially problematic coils as needed. Coils may be removed by a coil crane.
Claims
1. A method for detecting steel coils having a misshapen coil eye and removing said coils from a production queue, said method comprising:
providing a queue of steel coils, said queue of coils being conveyed on a coil conveying system, each steel coil of said queue of steel coils having a coil eye;
providing a camera and light source for said camera;
providing a retroreflector to reflect light from said light source;
conveying each steel coil of said queue of steel coils between said camera/light source and said retroreflector such that: i) said retroreflector is visible by said camera through said coil eye; and ii) light from said light source can pass through said coil eye; flashing said light source causing light from said light source to reflect off said retroreflector;
forming an image of said coil eye by capturing said reflected light using said camera;
analyzing said image to define the circumference of said coil eye and determine the largest and smallest diameter of said coil eye; and
removing coils with misshapen eyes from said queue.
2. The method of claim 1 , wherein said coil conveying system is a walking beam coil conveyor.
3. The method of claim 1 , wherein said camera is a high resolution smart camera.
4. The method of claim 1 , wherein said retroreflector comprises a flat panel covered in reflective tape.
5. The method of claim 1 , wherein said image is saturated by said reflected light and said coil eye appears as a white circle against a dark background making said coil eye circumference well defined.
6. The method of claim 1 , wherein said light source is an LED ring light.
7. The method of claim 1 , wherein the coil eyed diameter 90 degrees perpendicular to said maximum diameter is also measured.
8. The method of claim 1 , wherein said step of removing coils comprises removing said coils with a coil crane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/IB2018/060239 WO2020128572A1 (en) | 2018-12-18 | 2018-12-18 | Method for detecting issues with coil eyes and a coil eye diameter measurement camera system therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/IB2018/060239 WO2020128572A1 (en) | 2018-12-18 | 2018-12-18 | Method for detecting issues with coil eyes and a coil eye diameter measurement camera system therefor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2020128572A1 true WO2020128572A1 (en) | 2020-06-25 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/IB2018/060239 WO2020128572A1 (en) | 2018-12-18 | 2018-12-18 | Method for detecting issues with coil eyes and a coil eye diameter measurement camera system therefor |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2020128572A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI826106B (en) * | 2022-11-08 | 2023-12-11 | 中國鋼鐵股份有限公司 | Detecting system and detecting method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3017414B2 (en) * | 1995-06-30 | 2000-03-06 | 日本鋼管株式会社 | Coil inner diameter deviation detection method and its detection device |
| DE10016195A1 (en) * | 2000-03-31 | 2001-10-11 | Birke Elektroanlagen Gmbh | Optical helical-object quality detection device for e.g. screw coil spring production machine, has illumination unit comprising LED and camera arranged on spring quality evaluation machine |
| JP2007187497A (en) * | 2006-01-12 | 2007-07-26 | Nippon Steel Corp | Method and device for detecting collapse in internal diameter of rolled coil |
| KR101553152B1 (en) * | 2014-03-27 | 2015-09-15 | 현대제철 주식회사 | Apparatus for measuring deformation of rolled coil and method thereof |
| KR101917532B1 (en) * | 2017-08-18 | 2018-11-09 | 주식회사 포스코 | Appratus and method measuring kink of coil |
-
2018
- 2018-12-18 WO PCT/IB2018/060239 patent/WO2020128572A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3017414B2 (en) * | 1995-06-30 | 2000-03-06 | 日本鋼管株式会社 | Coil inner diameter deviation detection method and its detection device |
| DE10016195A1 (en) * | 2000-03-31 | 2001-10-11 | Birke Elektroanlagen Gmbh | Optical helical-object quality detection device for e.g. screw coil spring production machine, has illumination unit comprising LED and camera arranged on spring quality evaluation machine |
| JP2007187497A (en) * | 2006-01-12 | 2007-07-26 | Nippon Steel Corp | Method and device for detecting collapse in internal diameter of rolled coil |
| KR101553152B1 (en) * | 2014-03-27 | 2015-09-15 | 현대제철 주식회사 | Apparatus for measuring deformation of rolled coil and method thereof |
| KR101917532B1 (en) * | 2017-08-18 | 2018-11-09 | 주식회사 포스코 | Appratus and method measuring kink of coil |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI826106B (en) * | 2022-11-08 | 2023-12-11 | 中國鋼鐵股份有限公司 | Detecting system and detecting method |
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