JP3870313B2 - How to work with coils marked for defects - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of operating a defect-marked coil in a steel process line. More specifically, the present invention relates to a method for working a defect-marked coil in an iron and steel process line that can display defects reliably and contribute to quality assurance by marking on a defective portion on the surface of a steel sheet.
[0002]
[Prior art]
Cold-rolled steel sheets manufactured by cold rolling are inspected for surface defects over the entire length of the coil for quality assurance. As a method for detecting defects on the surface of a cold-rolled steel sheet, the surface of the steel sheet running in the line is scanned with a laser beam in the width direction, and the reflected light is converted into voltage intensity by a photoelectric conversion element such as a CCD element. A method for discriminating the presence / absence and the degree of the above has already been established (Japanese Patent Laid-Open No. 63-62825).
[0003]
Normally, the inspection result is displayed on a CRT or the like as a defect position, defect name and defect grade as information, or printed out as a document.
[0004]
It is impossible to manufacture all products without defects. For this reason, the defective defect portion of the coil is removed based on the defect information displayed on the CRT or the like on the line, or the coil is shipped after the harmful defect portion of the coil is removed by inspection in the next process based on the defect information. Yes. In addition, the purchaser submits a document describing the defect information printed out together with the coil including the harmful defect portion, and the purchaser removes the harmful defect.
[0005]
When removing harmful defects in the line or the next process, there is no clear standard for the degree of harm of surface defects, so removal of harmful defects is an overaction from the viewpoint of quality assurance. In addition, the harmful defect portion may not be removed due to a determination error such as an overlooked or hard-to-determine defect. Further, by removing the harmful defect portion, the unit weight of the coil is reduced, and there are problems such as a reduction in work efficiency when the purchaser processes the coil.
[0006]
On the other hand, the coil purchaser must work while checking the data of the document containing the defect information against the actual product, which is not only cumbersome, but in some cases the defect has been overlooked. There is a risk of being processed.
[0007]
For this reason, in Japanese Patent Application Laid-Open No. 4-291138, marking is performed using a marking device that sprays paint or the like on the platen portion of the steel plate detected by the platen detection device, and the purchaser reexamines the platen part. It has been proposed to make it easy to identify the hooked part when doing so.
[0008]
[Problems to be solved by the invention]
However, in the marking method disclosed in Japanese Patent Application Laid-Open No. 4-291138, since there is no confirmation as to whether or not the marking is performed normally, if the marking is abnormal, the purchaser is more disturbed than before. In addition, when paint is sprayed, the markings are shaded, and in places where there is a lot of paint, there is a risk that the paint will cause creases in normal parts after drying. In the case of the spray method, there is no problem when the steel plate is oil-free, but in the case of a steel plate after oil coating, the coating is sprayed on the oil film, so that no marking remains on the surface of the steel plate.
[0009]
Further, if all the marked parts are marked, there are also harmful effects such as complicated work due to the markings on defective parts that are harmless to the purchaser, and the work efficiency is reduced.
[0010]
The present invention has been made to solve the above-mentioned problems, and its main purpose is to generate flaws on the steel sheet due to defect marking, regardless of the presence or absence of oil such as rust preventive oil on the steel sheet surface. It is an object of the present invention to provide a method for working with a defect-marked coil that makes it possible to identify harmful defects reliably and easily.
[0011]
[Means for Solving the Problems]
The gist of the present invention for solving the above problems is as follows .
[0013]
(1) A coil marked with a defect marking by the following defect marking method is inserted into a facility equipped with a defect marking detection device, and defect information detected by the defect marking detection device is reflected in a defect removal operation. How to work with a defect marked coil.
The defect marking method includes:
A defect discriminating step for discriminating harmful defects based on a signal from the surface defect meter in a continuous processing line of a steel plate in which a surface defect meter for detecting surface defects and an ink marker device for marking the defect position with ink are installed; ,
And a marking step of marking with ink that disappears with a weak alkaline detergent at the defect position when the harmful defect reaches the ink marker device.
(2) The coil marked by the following defect marking method is inserted into a facility equipped with a defect marking detection device, and the defect information detected by the defect marking detection device is reflected in the defect removal operation. How to work with a defect marked coil.
The defect marking method includes:
A defect discriminating step for discriminating harmful defects based on a signal from the surface defect meter in a continuous processing line of a steel plate in which a surface defect meter for detecting surface defects and an ink marker device for marking the defect position with ink are installed; ,
When the harmful defect reaches the ink marker device, a marking step is performed at the defect position by marking with ink that disappears with a weak alkaline detergent. Is attached to the traveling steel plate for marking.
(3) In the defect marking method,
The pressing method of the felt is in a range of 150 to 500 g, and the defect-marked coil working method according to (2) .
[0014]
(4) In the defect marking method,
The defect discrimination step discriminates between harmful defects, difficult-to-discriminate defects, and harmless defects,
The marking step is performed when a harmful defect or a difficult-to-determine defect reaches the ink marker device, and the defect-marked coil operation according to any one of (1) to (3) Method.
[0018]
(5) The coil marked by the following defect marking method is loaded into a facility equipped with a defect marking detection device, and the defect information detected by the defect marking detection device is reflected in the defect removal operation. Working method of defect-marked coil The defect marking method is:
A charging process for charging a coil in which harmful defects have been identified into a continuous processing line of a steel plate provided with an ink marker device for marking with ink;
And a marking step of marking with ink that disappears with a weak alkaline detergent at the point of time when the harmful defect reaches the ink marker device based on information on the harmful defect identified in advance.
(6) A coil marked with a defect marking by the following defect marking method is inserted into a facility equipped with a defect marking detection device, and defect information detected by the defect marking detection device is reflected in a defect removal operation. How to work with a defect marked coil.
The defect marking method includes:
A charging process for charging a coil in which harmful defects have been identified into a continuous processing line of a steel plate provided with an ink marker device for marking with ink;
A marking step of marking with ink that disappears with a weak alkaline detergent at the point of time when the harmful defect reaches the ink marker device based on information on the harmful defect identified in advance, The felt soaked with ink is directly pressed against the steel plate, and the ink is adhered to the traveling steel plate for marking.
(7) In the defect marking method,
The pressing method of the felt is in the range of 150 to 500 g, and the defect-marked coil working method according to (6) .
[0019]
(8) In the defect marking method,
About the coil charged in the charging process, it is discriminated into a harmful defect, a hard-to-determine defect, and a harmless defect,
The marking process is performed when a defective defect or a difficult-to-determine defect reaches the ink marker device, and the defect-marked coil operation according to any one of (5) to (7) is performed. Method.
[0020]
(9) In the defect marking method,
The marking length in the marking step is set so that the defective portion does not come out of the defect marking. The defect-marked coil according to any one of (1) to (8) , Work method.
[0021]
(10) In the defect marking method,
The method of working a coil marked with a defect according to any one of (1) to (9) , wherein a line width of the marking in the marking step is in a range of 3 to 10 mm.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be specifically described.
FIG. 1 is a diagram showing a configuration example of a continuous processing line of a steel plate used for manufacturing a defect-marked coil, and shows a main part of a coiling facility for the steel plate. In FIG. 1, 3 is a surface defect meter, and includes a detector 2 and a signal processing unit 4 on the front and back of a steel plate 1, 5 is a CRT, 6 is a centralized control panel, 7 is a secondary determination input device, 8 is a defect marking device ( Ink marker device), 9 is a defect marking detection device, 10 is a tension reel, 11 is a transport roll, 12 is a pulse transmitter, 13 is a steel plate transport distance calculation device, 14 is an external storage device, 15 is a cutting machine, and 16 is an inspection. It is a stand.
[0023]
In the apparatus of FIG. 1, a defect candidate defect on the front and back surfaces of the steel sheet 1 is detected by the detector 2 on the front and back surfaces of the steel sheet of the surface defect meter 3, and the detected signal is sent to the signal processing unit 4. The signal processing unit 4 calculates the defect name, defect grade, and defect length based on the signal obtained from the feature amount of the defect candidate of the signal exceeding a certain threshold.
[0024]
The calculated defect information is displayed on the screen of the CRT 5, and the defect occurrence signal, the defect information, and the defect position are output to the centralized control panel 6.
[0025]
Further, the number of rotations of the transport roll 11 that transports the steel sheet 1 is measured by the pulse transmitter 12, the steel sheet transport distance calculation device 13 calculates the steel sheet feed length, and the calculation result is output to the centralized control panel 6. The central control panel 6 edits the defect information and discriminates harmful defects and difficult-to-determine defects from the defect name and defect grade. Further, if necessary, the centralized monitoring panel 6 further determines the presence / absence of marking for the harmful defects and difficult-to-discriminate defects discriminated above.
[0026]
The centralized control panel 6 tracks the defect position based on the steel sheet feed length sent from the steel sheet transport distance calculation device 13 and outputs an alarm output at the secondary determination place (inspection table) 16 to reach the harmful defect portion. If necessary, automatic deceleration is performed to make it easier for the operator to determine the defect.
[0027]
When the defective part reaches the secondary determination place (inspection table) 16, the operator performs a visual inspection to make a secondary determination, and the detection result of the surface defect meter 3 is confirmed by the CRT 5 to compare whether the result is correct. To do. When the results are different, correction is performed, and the correction result is input to the secondary determination input device 7 and further output to the centralized control panel 6. FIG. 2 is a diagram showing an example of the screen display of the CRT 5. The already displayed defect information is information on the surface defect meter 3, and a blank is a place where the secondary determination result is input.
[0028]
The centralized control panel 6 re-edits the defect information based on the correction information, and discriminates harmful defects and difficult-to-determine defects from the defect name and defect grade. Further, the centralized control panel 6 determines that there is a marking if there is a defect position of the harmful defect / difficult-to-determine defect based on the feed length of the steel plate 1 obtained from the number of rotations of the transport roll 11. And a start signal is output so that the defect marking device 8 is started when the defective part passes through the defect marking device 8.
[0029]
The defect marking device 8 is activated based on the activation signal, and marking is performed on the harmful defect portion and the difficult-to-determine defect portion in synchronization with the timing when the harmful defect / difficult-to-determine defect passes through the defect marking device 8.
[0030]
The marking length is set so that the defect portion does not come out of the defect marking in consideration of the tracking accuracy of the defect position. In consideration of tracking accuracy, this device outputs a command to add 0.5 m before and after the defect length discriminated by the centralized control panel 8 and mark it 1 m longer than the defect length, and the length is about several mm. In the case of the following point defects, a command is output so that marking is performed by adding 0.25 m before and after. FIG. 3 is a diagram showing the state of the defect portion position and the defect marking position. The harmful defect 20 is within the display range in the length direction of the defect marking 21.
[0031]
The defect marking device 8 starts marking simultaneously with the marking command. The marking is performed by directly pressing the felt soaked with the ink against the steel plate 1 so that the ink adheres to the steel plate 1. Even an oiled coil can be reliably marked on the surface of the steel sheet. In addition, since there is no problem of shading like a paint, no pressing wrinkles are generated on the steel sheet surface. Since the felt is in direct contact with the steel plate 1 and wears, if it is marched beyond the reference length, an alarm is output from the central control panel 6 to prompt the operator to change the felt.
[0032]
One defect marking device 8 may be provided, but two inks are prepared and two types of ink are prepared, and the color of the ink is changed according to the defect grade (for example, red ink is used when the purchaser's harmful defect is clear) Marking is performed, and defects that are difficult to distinguish are marked with blue ink.), Which is more useful for identifying and working with defects. In any case, it is necessary to select an ink that disappears with a weak alkaline detergent.
[0033]
From the viewpoint of easy visual detection and easy detection by the defect marking detection device 9, the optimum line width of the marking is in the range of 3 to 10 mm. Further, the pressing pressure of the felt is optimally in the range of 150 to 500 g from the viewpoint of the wear of the felt and the sharpness of the ink.
[0034]
In order to detect the defect marking, the defect marking device 8 and the defect marking detection device 9 are disposed at the same position in the steel plate width direction. FIG. 4 is a diagram showing the case where there is one defect marking device 8 and one defect marking detection device 9, and FIG.
[0035]
FIG. 6 shows an example of a defective portion and a defect marking position when marking is performed using a single defect marking device. The harmful ink 20 and the hard-to-determine defect 22 are defect markings 21 using the same ink. Is displayed. FIG. 7 shows a case where two defect marking devices are provided and marked using inks of different colors. The harmful defect 20 is indicated by a defect marking 21a (for example, red), and the hard-to-determine defect 22 is indicated by a defect marking 21b. (For example, blue).
[0036]
The defect marking detection device 9 constantly monitors the state of defect marking, monitors the marking length, ink scum, the presence / absence of marking at a defect-free location, and outputs the monitoring result to the centralized control panel 6. The central control panel 6 judges the quality of the marking, outputs an alarm in the event of an abnormality, alerts the operator, and instructs the suspension of the coil shipment. For coils whose shipment has been suspended, take measures such as re-examination.
[0037]
When it is determined that the defect marking monitored by the defect marking detection device 9 is normal, the defect information and the defect position are input to the external storage device 14, and after being cut by the cutting machine 15, the defect information and the defect position are reversely developed and printed. Out.
[0038]
In addition, since a coil is cut | disconnected by the cutting machine 15 for every purchaser, the length reference | standard of a coil is based on the cutting signal in the cutting machine 15. FIG. Documents to be sent to the purchaser are reversely developed starting from the outer periphery of the coil to make it easier for the purchaser to use.
[0039]
The coil manufactured in this way is clearly marked at the position of the harmful defect, so it is easy to check for harmful defects when removing the defective defect in the next process or when the purchaser rewinds the coil. Can be discriminated.
[0040]
In the above description, the operator's visual inspection is intervened in the determination of the harmful defect, but the visual inspection may not be performed as long as the defect detection accuracy of the surface defect meter 3 can be satisfied.
[0041]
In the apparatus shown in FIG. 1, the surface defect meter 3, the defect marking device 8, and the defect marking detection device 9 are arranged on the same line. However, as described above, on the line equipped with the surface defect meter, based on the defect information detected by the surface defect meter, the position of the defect, the defect name and defect grade are calculated, and this information is displayed on the CRT, Alternatively, it has already been printed out with documents.
[0042]
Therefore, a defect marking device and a defect marking detection device are installed on a line different from a line equipped with a surface defect meter, and harmful and difficult-to-determine defects are identified on the line equipped with the surface defect meter. As in the case of FIG. 1, the defect position may be marked and the defect marking may be confirmed, and the result may be printed out as a document.
[0043]
In this case, the harmful defect / distinguishable defect information edited and discriminated by the line equipped with the surface defect meter is output to the central control panel of another line through the external storage device together with the defect position information. If you track harmful defects and difficult-to-determine defects, mark with a defect marking device, monitor the status of defect marking with a defect marking detection device, re-edit the monitoring results with a centralized control panel, and output it to an external storage device Good.
[0044]
By doing in this way, the coil by which defect marking was carried out with cheaper equipment can be manufactured.
[0045]
In this case, examples of arrangement of main equipment on another line are shown in FIGS. FIG. 8 shows a case where the Euler 17 is arranged on the downstream side of the defect marking detection device 9, and FIG. 9 shows a case where the Euler 17 is arranged on the upstream side of the defect marking device 8. FIG. 10 shows a case where the trimmer 18 and the inspection table 16 are arranged on the upstream side of the marking device 8. In the case of FIG. 10, if necessary, the result of visual inspection of defects on the inspection table can be secondarily corrected as in the case of FIG.
[0046]
In addition, a defect marking detection device is installed in the next process equipment of the coil marked with the defect marking, and the defect information detected by the defect marking device is reflected in the defect removal work in the equipment, so that the equipment has higher accuracy. In addition, efficient defect removal work can be performed. The equipment for installing the defect marking detection device may be equipment on the steel sheet manufacturer side or equipment on the coil purchaser side.
[0047]
FIG. 11 shows an example of a coiling facility equipped with the defect marking detection device 9. The defect information detected by the defect marking detection device 9 is reflected in the defect removal operation, for example, an alarm is output, or the coil payout speed is necessary. Thus, the inspection accuracy at the inspection table 16 and the inspection efficiency can be improved, or the defect removal work efficiency can be improved.
[0048]
FIG. 12 is an example of a cutting facility provided with the defect marking detection device 9. Based on the defect information detected by the defect marking detection device 9, the gate switching device 23 is operated and the sheet cut by the cutting machine 15 is non-defective. It is possible to select the pillar 24 and the defective pillar 25. Defect removal work can be performed with high efficiency.
[0049]
【The invention's effect】
As described above, the defect-marked coil targeted by the present invention does not cause flaws on the steel sheet due to the defect marking, and reliably and easily causes harmful defects regardless of the presence or absence of oil such as rust preventive oil on the steel sheet surface. It is marked with a defect that can be identified.
[0050]
Moreover, since the defect position on the steel plate surface is tracked and the harmful defect portion is marked , the defect portion can be easily detected. Moreover , it is made a required coil length by the harmful defect part winding.
[0051]
Further, the change marking color in accordance with the order of the defect, or unwanted markings displayed in consideration of the defect name and about defects is not performed.
[0052]
Therefore, in the coil working method of the present invention, the harmful defect removing operation is facilitated, the working efficiency is greatly improved, and the excessive defect removing operation is not required even for the difficult-to-determine defect, thereby improving the yield.
[0053]
Further, by reflecting the defect information detected by the defect marking device to defect removal work, good Ri highly accurate, also it is possible to perform efficient defect removal work.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration example of a continuous processing line of a steel plate used for manufacturing a coil marked with a defect, and shows a main part of a coiling equipment for the steel plate.
FIG. 2 is a diagram showing an example of a CRT display screen.
FIG. 3 is a diagram showing a state of a defect portion position and a defect marking position.
FIG. 4 is a diagram showing an example of an equipment arrangement when one defect marking device and one defect marking detection device are provided.
FIG. 5 is a diagram showing an example of equipment arrangement when two defect marking devices and two defect marking detection devices are provided.
FIG. 6 is a diagram showing a state in which a defect portion is marked using one defect marking apparatus.
FIG. 7 is a view showing a state where harmful defects and difficult-to-discriminate defects are separately marked using two defect marking apparatuses.
FIG. 8 is a diagram showing an arrangement example of main equipment of a line including a defect marking device and a defect marking detection device used for manufacturing a defect-marked coil .
FIG. 9 is a view showing an arrangement example of main equipment of another line provided with a defect marking device and a defect marking detection device used for manufacturing a defect-marked coil .
FIG. 10 is a diagram showing an arrangement example of main equipment of a line including an inspection table in addition to a defect marking device and a defect marking detection device used for manufacturing a defect-marked coil .
FIG. 11 is a diagram showing an arrangement example of main equipment of a coiling equipment provided with a defect marking detection device used for carrying out the present invention .
FIG. 12 is a diagram showing an arrangement example of main equipment of a cutting equipment provided with a defect marking detection device used for carrying out the present invention .
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Steel plate 2 Detector 3 Surface defect meter 4 Signal processing part 5 CRT
6 Centralized control panel 7 Secondary determination input device 8, 8a, 8b Defect marking device (ink marker device)
9, 9a, 9b Defect marking detection device 10 Tension reel 11 Transport roll 12 Pulse transmitter 13 Steel plate transport distance calculation device 14 External storage device 15 Cutting machine 16 Inspection table 17 Euler 18 Trimmer 19 Payoff reel 20 Harmful defects 21, 21a, 21b Defect marking 22 Defects difficult to detect 23 Gate switching device 24 Good product pillar 25 Defective product pillar

Claims (10)

The defect marking is characterized in that the coil marked with the defect marking method described below is loaded into a facility equipped with a defect marking detection device, and the defect information detected by the defect marking detection device is reflected in the defect removal operation. Coil working method.
The defect marking method includes:
A defect discriminating step for discriminating harmful defects based on a signal from the surface defect meter in a continuous processing line of a steel plate in which a surface defect meter for detecting surface defects and an ink marker device for marking the defect position with ink are installed; ,
And a marking step of marking with ink that disappears with a weak alkaline detergent at the defect position when the harmful defect reaches the ink marker device. The defect marking is characterized in that the coil marked with the defect marking method described below is loaded into a facility equipped with a defect marking detection device, and the defect information detected by the defect marking detection device is reflected in the defect removal operation. Coil working method.
The defect marking method includes:
A defect discriminating step for discriminating harmful defects based on a signal from the surface defect meter in a continuous processing line of a steel plate in which a surface defect meter for detecting surface defects and an ink marker device for marking the defect position with ink are installed; ,
When the harmful defect reaches the ink marker device, the marking step includes marking with an ink that disappears with a weak alkaline detergent, and the marking step directly presses the felt soaked on the steel plate to the ink. Is attached to the traveling steel plate for marking. In the defect marking method,
The working method of a coil marked with a defect according to claim 2 , wherein the pressing pressure of the felt is in a range of 150 to 500 g. In the defect marking method,
The defect discrimination step discriminates between harmful defects, difficult-to-discriminate defects, and harmless defects,
The method of working a coil with a defect marking according to any one of claims 1 to 3 , wherein the marking step performs marking when a harmful defect or a difficult-to-determine defect reaches the ink marker device. The defect marking is characterized in that the coil marked with the defect marking method described below is loaded into a facility equipped with a defect marking detection device, and the defect information detected by the defect marking detection device is reflected in the defect removal operation. Coil working method.
The defect marking method includes:
A charging process for charging a coil in which harmful defects have been identified into a continuous processing line of a steel plate provided with an ink marker device for marking with ink;
And a marking step of marking with ink that disappears with a weak alkaline detergent at the point of time when the harmful defect reaches the ink marker device based on information on the harmful defect identified in advance. The defect marking is characterized in that the coil marked with the defect marking method described below is loaded into a facility equipped with a defect marking detection device, and the defect information detected by the defect marking detection device is reflected in the defect removal operation. Coil working method.
The defect marking method includes:
A charging process for charging a coil in which harmful defects have been identified into a continuous processing line of a steel plate provided with an ink marker device for marking with ink;
A marking step of marking with ink that disappears with a weak alkaline detergent at the point of time when the harmful defect reaches the ink marker device based on information on the harmful defect identified in advance, The felt soaked with ink is directly pressed against the steel plate, and the ink is adhered to the traveling steel plate for marking. In the defect marking method,
The working method of a coil with defect marking according to claim 6 , wherein the pressing pressure of the felt is in a range of 150 to 500 g. In the defect marking method,
About the coil charged in the charging process, it is discriminated into a harmful defect, a hard-to-determine defect, and a harmless defect,
8. The working method of a coil with defect marking according to claim 5 , wherein the marking step performs marking when a harmful defect or a difficult-to-determine defect reaches the ink marker device. 9. In the defect marking method,
The method for working a coil with a defect marking according to any one of claims 1 to 8 , wherein the marking length in the marking step is set so that a defective portion does not come out of the defect marking. . In the defect marking method,
The line width of the marking in the marking process, defects marked working methods of coils according to any one of claims 1 to 9, characterized in that in the range of 3 to 10 mm.

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