JP2001188046A - Manufacturing method for defect-marked coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a defect-marked coil in which a hamrful defect can be discriminated surely and easily. SOLUTION: In a continuous treatment line for a steel sheet, a surface defect meter which detects a surface flaw is installed, and an ink marker apparatus by which a marking operation is performed to the position of a defect by using an ink is installed, or an internal defect meter which detects a defect at the inside of the steel sheet is installed. The treatment line is provided with a process in which the steel sheet is treated continuously. The treatment line is provided with a process in which the surface flaw of the steel sheet is detected by the surface defect meter, which computes the name of the defect, the grade of the defect, the length of the defect and the position of the defect in the width direction on the basis of information on the defeated flaw and which discriminates a harmful defect, a hard-to- discriminate defect and a harmless defect. The treatment line is provided with a process in which the internal flaw of the steel sheet is detected by the internal defect meter, which computes the length of the defect and the position of the defect in the width direction on the basis of the information on the detected flaw and which discriminates the harmful defect and the harmless defect. The treatment line is provided with a process in which the position of every flaw is tracked about the harmful defect and the hard-to-discriminate defect and in which the marking operation is performed to the position of the defect by using the ink at a point of time when the part of the defect reaches the ink marker apparatus.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a defect marked coil in a steel process line. More specifically, the present invention relates to a method of manufacturing a coil with a defect marking in a steel process line, which can reliably display a defect by marking a defective portion of a steel sheet and contribute to quality assurance.

[0002]

2. Description of the Related Art A cold rolled steel sheet manufactured by cold rolling is inspected for surface defects over the entire length of the coil for quality assurance. As a method for detecting the surface defect of a cold-rolled steel sheet, the surface of the steel sheet traveling in the line is scanned in the width direction with a laser beam, and the reflected light is converted into a voltage intensity by a photoelectric conversion element such as a CCD element. A method of determining the presence / absence and degree of the presence has already been established. Regarding the internal defect of the steel sheet, a method of detecting the defect by calculating the defect depth and the defect size in the thickness direction of the defective steel sheet using a magnetic flaw detector has already been established (Japanese Patent Laid-Open No. 5-196581).

Normally, the defect inspection result is displayed on a CRT or the like as information on the defect position, defect name, defect grade, or the like, or printed out as a document.

To make all products defect-free,
Cannot be manufactured. Therefore, after removing the harmful defective portion of the purchaser based on the defect information displayed on the CRT or the like at the line, or removing the harmful defective portion of the purchaser by re-inspection in the next process based on the defect information Has shipped. Further, a document describing the defect information printed out together with the coil including the harmful defect portion is submitted to the purchaser, and the purchaser side has the harmful defect removed.

When a harmful defect is removed in the line or in the next step, there is no clear standard for the degree of harm of the surface defect, and the removal of the harmful defect is an over-action in terms of quality assurance. In some cases, the harmful defect portion is not removed due to an oversight or an erroneous determination due to a barely identifiable defect. Further, by removing the harmful defective portion, the unit weight of the coil is reduced, and there is an adverse effect such as a decrease in the work efficiency of the purchaser.

On the other hand, the purchaser of the coil must work while checking the document data describing the defect information against the actual product. This operation is not only troublesome, but in some cases, the defect is not identified. There is a risk of processing while dropping.

For these reasons, Japanese Patent Application Laid-Open No. Hei 4-2911
In Japanese Patent Publication No. 38, marking is performed using a marking device that sprays paint or the like on a flawed portion of a steel sheet detected by a flaw detection device, and the flawed portion is easily identified when a buyer re-examines the flawed portion. It has been proposed to be able to do so.

[0008]

SUMMARY OF THE INVENTION However, Japanese Patent Application Laid-Open No. 4-2
In the marking method of 91138, there is no confirmation as to whether or not the marking has been performed normally. Therefore, if the marking is abnormal, it causes more trouble to the purchaser than before. Further, when a paint or the like is sprayed, shading is generated in the marking, and in a place where the paint is abundant, there is a risk that the paint is dried and a flaw is generated in a normal portion. In the case of the spray method, there is no problem if the steel sheet is oilless, but in the case of the oiled steel sheet, the paint is sprayed on the oil film and no marking remains on the steel sheet surface.

Further, if all the flawed parts are marked, there is also a problem that the work becomes complicated because the defective parts which are harmless to the purchaser are also marked, and the work efficiency is reduced.

[0010] For the purchaser, the position of the defect marking should be different between the case where the defect marking of the defective portion is detected automatically and the case where the defect marking is performed manually (visually). That is, when the defect marking is automatically detected, the position of the defect marking is constant, and when the defect marking is manually detected, the work efficiency is better when the defect marking is performed at the defect position.

In some cases, it is preferable to change the position of the defect marking according to the use of the steel sheet. For example, when using a steel plate by press blanking, if the position of the defect marking is constant, after pressing, there is a defect such as defect but no defect marking, and conversely, there is a defect marking but no defect such as no defect. May occur. In such a case, the purchaser is inconvenienced more than ever.

In addition, even if the same defect is a harmful defect at the center of the steel sheet, it is a harmless defect at the edge of the steel sheet, or a harmful defect on the surface of the steel sheet, but a harmless defect on the back surface of the steel sheet. The degree of harm varies depending on the application.

In addition, internal defects (for example, two sheets) of a steel sheet cannot be visually detected, and when a severe processing such as a press working is performed on the steel sheet, it causes a crack or the like. Therefore, it is beneficial to mark internal defects as well as surface defects.

The present invention has been made in consideration of the above problems, and its main purpose is to perform defect marking according to the usage pattern of a purchaser, without causing flaws on a steel sheet due to the defect marking. It is another object of the present invention to provide a method of manufacturing a coil having a defect marked so that harmful defects can be reliably and easily identified regardless of whether oil such as rust-preventive oil adheres to the surface of a steel sheet.

[0015]

The gist of the present invention for solving the above problems is as follows.

(1) A surface defect meter for detecting surface flaws and an ink marker device for marking a defect position with ink.
Alternatively, in a continuous processing line of steel sheets provided with an internal defect meter that detects defects inside the steel sheet, a step of continuously processing the steel sheet, and detecting a surface flaw of the steel sheet with a surface defect meter, based on the detected flaw information, The process of calculating the defect name, defect grade, defect length and defect position in the width direction, and identifying harmful defects, difficult-to-identify defects, and harmless defects, and also detecting the internal flaws of the steel sheet with the internal defect meter, Based on the detected flaw information, the length of the defect, the defect position in the width direction is calculated, further harmful defect / harmless defect identification step, the harmful defect,
Manufacturing a coil with a defect marking, wherein the defect position tracking is performed for each of the difficult-to-identify defects, and the defect position is marked with ink when the defective portion reaches the ink marker device. Method.

(2) Regarding surface defects, identification of harmful defects, difficult-to-discriminate defects, and harmless defects is based on the defect name, defect grade, defect length, defect position in the width direction, defect position on the front and back surfaces, and the use of the steel sheet. (1) wherein, for internal flaws, harmful / harmless defects are identified based on the length of the defect, the defect position in the width direction, and the use of the steel sheet.
5. A method for producing a coil with a defect marking according to claim 1.

(3) For a surface flaw of the coil, a defect name, a defect grade, a defect length, and a defect position in the width direction are calculated for a surface flaw of the coil on a line provided with a surface defect meter or an internal defect meter in advance. A process in which difficult-to-discriminate defects are identified, or for the internal flaws of the coil, a defect length and a defect position in the width direction are calculated, and further, a harmful defect / harmless defect is identified, and the coil is marked with ink. The harmful defect / hard-to-discriminate defect is inserted into a continuous processing line of a steel plate provided with an ink marker device and continuously processed, and the harmful defect / hard-to-identify defect is determined based on information of the harmful defect / hard-to-discriminate defect previously identified. Wherein the defect position is marked with ink at the time of reaching the defect.

(4) An inspector re-determines a defect identified as a difficult-to-identify defect by the surface defect meter, identifies the defect as a harmful defect or a harmless defect, and marks the defect position of the harmful defect with ink. The method for producing a coil with a defect marking according to any one of the above (1) to (3).

(5) The above-mentioned (1), wherein an alarm is output for a defect identified as a difficult-to-identify defect by the surface defect meter, automatic deceleration is performed, and an inspector re-determines the difficult-to-identify defect. A method for manufacturing a coil with a defect marking according to any one of (4) to (4).

(6) When the inspector re-determines a defect identified as a difficult-to-identify defect by the surface defect meter,
The method of manufacturing a coil with a defect marking according to the above (4) or (5), wherein a defect image display and a defect position display are performed.

(7) The method according to any one of (1) to (6), wherein the position of the defect marking is changed based on the defect information in the width direction of the surface defect meter and the internal defect meter. Manufacturing method of coil with defect marking.

(8) The method of any of the above (1) to (7), wherein the position of the defect marking is changed according to the use of the steel sheet.

(9) The above (1) to (8), wherein marking is performed by distinguishing between harmful defects and defects that are difficult to determine.
13. The method for producing a coil with a defect marking according to any one of the above items.

(10) The method of manufacturing a coil with a defect marking according to any one of the above (1) to (9), wherein the harmful defect and the difficult-to-identify defect are distinguished by changing the color of the defect marking. Method.

(11) The color of the defect marking is changed according to the type of the steel sheet.
0) The method for producing a defect-marked coil according to any one of the items 0).

(12) A defect marking detection device is installed downstream of the ink marker device to monitor the marking state, and the defect marking according to any one of the above (1) to (11) is performed. Manufacturing method of coil.

(13) The method of manufacturing a coil with a defect marking according to any one of the above (1) to (12), wherein the threshold value of the defect marking detection device is changed according to the type of the steel sheet.

(14) The defect-marked coil according to any one of (1) to (13), wherein the ink marker device and the defect marking detection device are set so as to follow the defect marking position. Manufacturing method.

(15) The method for producing a defective-marked coil according to any one of the above (1) to (14), wherein an ink drying device is provided downstream of the ink marker device.

(16) The method according to any one of the above (1) to (15), wherein the ink marker device, the defect marking detection device and the ink drying device are set to follow the defect marking position. Manufacturing method of coil with defect marking.

(17) Harmful defects,
The method for producing a defect-marked coil according to any one of the above (1) to (16), wherein the threshold value of the harmless defect is changed.

(18) In the above (1) to (17) (excluding (10), (15) and (16)), a polishing member marker for marking with a polishing member instead of an ink marker device using ink. A method of manufacturing a coil with a defect marking, wherein an apparatus is installed and marking is performed with a polishing member instead of marking with ink.

[0034]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described specifically. 1 to 4 show examples of the arrangement of the main components of a continuous steel sheet processing line used for describing the embodiment of the present invention.

In FIG. 1, reference numeral 3 denotes a surface defect meter, which includes detectors 2 and a signal processing unit 4 on the front and back of the steel plate 1, and 5 denotes a CR.
T and 6 are central control panels, 7 is a secondary judgment 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 table.

In FIG. 2, a magnetic flaw detector (internal defect meter) 34 having a magnetic sensor 35 for detecting an internal defect of the steel plate 1 and a signal processing section 36 is additionally provided to the apparatus shown in FIG. 3 and 4, an ink drying device 40 for drying the marked ink is provided downstream of the defect marking device (ink marker device) 8 of the device shown in FIGS. 1 and 2, respectively.

In the apparatus shown in FIGS. 1 to 4, candidate detector flaws on the front and back surfaces of the steel plate 1 are detected by the detectors 2 on the front and back surfaces of the steel plate of the surface defect meter 3, and the detected signals are sent to the signal processing unit 4.
The signal processing unit 4 determines a defect name, a defect grade, a defect grade based on a signal obtained from a feature amount of a defect candidate of a signal exceeding a certain threshold value.
Calculation of the defect length and defect position in the width direction is performed.

The magnetic sensor 3 of the magnetic flaw detector 34
At 5, the internal defect of the steel plate 1 is detected, and the detected signal is sent to the signal processing unit 36. The signal processing unit 36 calculates the defect length and the position in the width direction of the defect based on the signal obtained from the feature amount of the defect candidate of the signal exceeding a certain threshold value, and calculates the calculation result as a signal processing unit of the surface defect meter 3. Send to 4.

The marking information such as the name of the marking target defect (including the internal defect when the internal defect meter 34 is provided), the defect grade, the edge dead zone, etc., sent from the host computer 23 for each of the front and back surfaces, and the surface defect A marking command is calculated from the result calculated based on the defect information detected by the total 3, or further based on the type and use of the steel sheet.

The calculated marking command and the calculated defect information are displayed on the screen of the CRT 5, and a defect occurrence signal, defect information and a defect position are output to the centralized control panel 6.

Further, the number of revolutions of the transport roll 11 for transporting the steel sheet 1 is measured by the pulse transmitter 12, the steel sheet transport length calculating device 13 calculates the steel sheet feed length, and outputs the calculation result to the central control panel 6. . The centralized control panel 6 edits the defect information, discriminates harmful defects and difficult-to-discriminate defects (internal defects are harmful defects, the same applies hereinafter) from defect names and defect grades, and, if necessary, Further, harmful defects and difficult-to-discriminate defects are discriminated in consideration of the defect position information on the front and back surfaces and the use of the steel sheet. If necessary, the centralized monitoring panel 6 further determines the presence / absence of marking for the harmful defect / hard-to-discriminate defect that has been discriminated as described above.

The centralized control panel 6 is provided with the steel plate transport distance calculating device 1
The defect position is tracked based on the feed length of the steel sheet sent from 3, and an alarm is output to the re-determination place (inspection table) 16 for the arrival of the difficult-to-discriminate defect. If necessary, automatic deceleration is performed and a defect image is displayed on the CRT 5a, so that the operator can easily determine the defect.

When the defective portion arrives at the secondary judgment place (inspection table) 16, the operator visually inspects and makes a secondary judgment, and checks the detection result of the surface defect meter 3 on the CRT 5, and confirms whether the result is correct. Or not. If the result is different, the correction is performed, the correction result is input to the secondary determination input device 7, and further output to the centralized control panel 6. FIG. 5 is a diagram showing an example of the screen display of the CRT 5. The defect information already displayed is the information of the surface defect meter 3, and the blank is a place to input the secondary judgment result.

The centralized control panel 6 re-edits the defect information based on the correction information, and discriminates harmful defects and difficult-to-identify defects from defect names and defect grades. Furthermore, the centralized control panel 6
Based on the feed length of the steel sheet 1 obtained from the number of rotations of the transport roll 11, tracking of the harmful defect / difficult to determine defect position (when marking presence / absence is determined, it is determined that marking is present) is performed. Before the defective portion passes through the defect marking device 8, the defect marking device 8 and the defect marking detection device 9 are moved to a position having a defect. Then, when the defective portion passes through the defect marking device 8, an activation signal is output so as to activate the defect marking device 8.

The defect marking device 8 is activated based on the activation signal, and marking is performed on the harmful defect portion / difficult-to-identify defect portion in synchronization with the timing at which the harmful defect / difficult-to-identify defect passes through the defect marking device 8. .

The defect marking device 8 starts marking simultaneously with a marking command. The marking is performed by directly pressing the felt impregnated with the ink on the steel plate 1 and causing the ink to adhere to the steel plate 1. Even a coil coated with oil can be reliably marked on the surface of a steel plate. Further, since there is no problem of shading such as paint, there is no generation of a press flaw on the surface of the steel sheet. The felt is in direct contact with the steel plate 1 and wears.
Will output a warning to alert workers to change felt.

The marking length is set in consideration of the tracking accuracy of the defect position so that the defective portion does not go outside the defect marking. In this apparatus, in consideration of the tracking accuracy, 0.5 m is added before and after each of the defect lengths discriminated by the centralized control panel 8, and a command is outputted so as to mark the defect length 1 m longer than the defect length. In the case of a point-like defect having a length of about several mm or less, a command is output to add 0.25 m before and after each point to perform marking.

It is more desirable to determine the length of the marking by an agreement with the purchaser. In addition, the central control panel 6
Monitors the allowable number of markings and the allowable marking length as other management items, and outputs an abnormal alarm to the alarm device 24 when these become equal to or larger than the allowable values.

The host computer 23 manages each coil based on the information from the centralized control panel 6 and determines whether or not it can be shipped.

FIG. 6 is a diagram showing a state of a defect portion position and a defect marking position.
Within the display range in the length direction.

The line width of the marking is optimally in the range of 3 to 10 mm from the viewpoint of easy detection by visual inspection and easy detection by the defect marking detection device 9. Further, the felt pressing pressure is set at 15 from the viewpoint of felt wear and ink sharpness.
The range of 0-500 g is optimal.

Although the number of the defect marking device 8 may be one,
It is desirable to provide two inks by arranging two inks so that the color of the marking can be changed.

By providing two defect marking devices 8 and preparing two types of ink, the color of the ink is changed according to the defect grade (for example, if the harmful defect of the purchaser is clear, use red ink. Perform marking and mark defects that are difficult to distinguish with blue ink.) Or change the color of the ink according to the type of steel sheet (for example, use black ink for steel sheets with a white background such as electrogalvanized steel sheets). In the case of a black steel plate such as an alloyed hot-dip galvanized steel plate, the marking is performed with white ink.) When performing defect identification work, more efficient work becomes possible.

Further, in press working or the like, the defect marking portion may be blanked out despite the presence of a defect. Therefore, the defect marking is performed in the width direction of the steel sheet regardless of the location of the harmful defect portion. It is preferable that marking can be performed at an arbitrary position. In any case, it is necessary to select an ink that disappears with a weak alkaline detergent. However, depending on the use of the steel sheet, it may not be necessary to remove the steel sheet with a weak alkaline detergent.

In the case of marking with ink as described above, there is no problem if the ink dries, but normal ink requires several seconds to dry. If the ink has not dried, the ink will transfer to the roll or coil. If the oil is applied before the ink dries, the ink does not dry forever, and the ink is transferred when the coil is wound on a tension reel. The above problem can be surely solved by installing an ink drying device for drying the marked ink downstream of the ink marker device.

FIG. 7 is a diagram showing a case where one defect marking device 8 and one defect marking detection device 9 are provided. The defect marking device 8 and the defect marking detection device 9 are arranged at the same position in the width direction of the steel plate 1 of the gantry 25, and are moved by a motor 27 to a position in the width direction of the steel plate indicated by the marking command. It can be moved through.

FIG. 8 is a diagram showing a case where two defect marking devices and two defect marking detection devices are provided. The defect marking device 8a and the defect marking detection device 9a, the defect marking device 8b and the defect marking detection device 9b
The racks 25a and 25b are arranged at the same position in the width direction of the steel plate 1 and can be moved independently of each other in the width direction of the steel plate as in the case of the apparatus of FIG.

FIG. 9 and FIG. 10 are views in which an ink drying device is installed downstream of the defect marking device. In FIG. 9, the defect marking device 8 and the ink drying device 40
In FIG. 10, the defect marking device 8, the ink drying device 40, and the defect marking detection device 9 are disposed at the same position on the gantry 25 in the width direction of the steel plate 1. In any device, the motor 2 is located at the position in the width direction of the steel sheet specified by the marking command.
7 can be moved via a moving device 26 which is driven.

Defect marking device 8 and ink drying device 4
Alternatively, two or more defect marking detection devices 9 may be installed. In FIG. 11, the defect marking device 8a, the ink drying device 40a, and the defect marking device 8b
And the ink drying device 40 are mounted on the frames 25a, 25, respectively.
12 is disposed at the same position in the width direction of the steel plate 1. In FIG. 12, the defect marking device 8 a and the ink drying device 4
8a, the defect marking detection device 9a, the defect marking device 8b, the ink drying device 40b, and the defect marking detection device 9b are arranged at the same position in the width direction of the steel plates 1 of the gantry 25a, 25b, respectively. As in
The steel plates can be moved independently of each other in the width direction.

FIG. 13 shows an example of a defective portion and a defective marking position in a case where marking is performed using one defect marking device. It is indicated by 21.

FIG. 14 shows a case in which two defect marking devices are provided and marking is performed using inks of different colors.
Due to (for example, red), the difficult-to-identify defect 22 is displayed as a defect marking 21b (for example, blue).

The defect marking detection device 9 constantly monitors the state of the defect marking, monitors the marking length, ink blur, presence / absence of marking at a non-defective location, and outputs the monitoring result to the centralized control panel 6. In order to improve the detection accuracy of the defect marking, it is preferable to correct the threshold value of the defect marking detection device according to the type of the steel sheet. The centralized control panel 6 judges the quality of the marking, and when abnormal, the alarm device 2
4 to call attention to the operator and instruct the customer to suspend the shipment of the coil. For the coil whose shipment has been suspended, take measures such as re-inspection.

If the defect marking monitored by the defect marking detecting device 9 is judged to be normal, the defect information and the defect position are input to the external storage device 14 and the defect information and defect position are reversed after being cut by the cutting machine 15. Unfolding, that is, converting the position from the inner circumference of the coil to the position from the outer circumference and printing out.

Since the coil is cut by the cutting machine 15 for each purchaser, the length of the coil is based on the cutting signal from the cutting machine 15. Documents to be sent to the purchaser are developed in reverse, starting from the outer peripheral side of the coil, to make it easier for the purchaser to utilize.

Since the coil manufactured in this manner has a clear mark at the position of the harmful defect, the harmful defect is removed in the next step, or when the buyer rewinds the coil during processing, the harmful defect is removed. Can be easily determined.

In the above description, the visual inspection of the operator is involved in the judgment of the harmful defect. However, the visual inspection may not be performed as long as the defect detection accuracy of the surface defect meter 3 can be satisfied. In addition, by installing the defect marking detection device in the next step of the marked coil, a more accurate and efficient defect removal operation can be performed.

In the apparatus shown in FIGS. 1 to 4, the surface defect meter 3 or the magnetic flaw detector 34, the defect marking device 8, and the defect marking detecting device 9 are arranged on the same line. However, as described above, on a line provided with a surface defect meter or a further internal defect meter, based on the flaw information detected by the surface defect meter or the further internal defect meter, the position of the defect, the defect name and the defect grade are determined. It has already been performed to calculate, display this information on a CRT or the like, or print out the information on a document.

Therefore, at least one of the defect marking device and the defect marking detection device is installed on a line different from the line provided with the surface defect meter or the internal defect meter, and the surface defect meter or the internal defect meter is provided. Harmful defects and difficult-to-identify defects are identified on the line, and based on this information, marking on the defect position and confirmation of the defect marking are performed on the other line as in the case of the apparatus of FIGS. May be printed out as a document.

In this case, the harmful defect / difficult-to-identify defect information edited and discriminated on the line provided with the surface defect meter or the internal defect meter together with the defect position information is transferred to the centralized control panel of another line via the external storage device. Output, perform tracking of the harmful defects and difficult to determine defects on another line, perform marking with a defect marking device, monitor the status of the defect marking with a defect marking detection device, and re-edit the monitoring result with a central control panel. Output to an external storage device.
By doing so, the effects of the present invention can be achieved with less expensive equipment.

In this case, examples of the arrangement of the main equipment of another line are shown in FIGS. FIG. 15 shows a case where the oiler 17 is disposed downstream of the defect marking detection device 9.
FIG. 17 shows a case in which a trimmer 18 and an inspection table 16 are provided on the upstream side of the marking device 8, and a defect marking detection device 9 is provided on the downstream side of the oiler 17. . In the case of FIG. 17, the result of the visual inspection for the defect on the inspection table can be secondarily corrected as necessary, similarly to the case of FIGS. 1 to 4.

An example of working on a marked coil will be described with reference to FIGS.

FIG. 18 shows a recoil line, which is a lower step of the continuous line. In addition to the defect marking detection device 9, a cleaning liquid jetting device 32 and a cleaning liquid wiping device 33 are additionally provided. When the defect marking detection device 9 detects a defect marking of a defect that is difficult to determine, a line stop command is output, and the inspector performs a re-determination. The inspector classifies harmful defects and harmless defects. When it is determined that the defect is harmless, the cleaning liquid jetting device 32 jets a weak alkaline cleaning liquid to wash off the marking, and then the cleaning liquid wiping device 33 wipes off the cleaning liquid and the marking ink to reapply oil. The defective and difficult-to-identify defects are re-determined, and the chips and harmful defects determined to be harmful defects are removed by the cutting machine 15 and only the non-defective coils are tensioned on the tension reel 10
Take up with.

FIG. 19 shows a shear line. The sheet having no defect marking is sent to the good product pillar 29, and when the defect marking detecting device 9 installed on the entrance side of the sheet line detects the defect marking, it outputs to the gate switching device 28, and the gate switching device 28 switches the gate. The sheet having the defect marking portion is sent to the defective product pillar 30 to remove the harmful defect portion and the difficult-to-identify defect portion.

For the steel sheet to be pressed, it is preferable to adopt a marking method in consideration of the intended use. FIG. 20 and FIG. 21 are diagrams showing examples of defect marking in the case of inspecting the harmful defect portion 20 visually after pressing. FIG.
In the case of 0, the defect marking 21 is performed on the defective portion 20, and FIG. 21 shows the case where the defect marking is performed on the same portion on both sides in the width direction of the steel sheet 1 regardless of the location of the defective portion. The position of the defect marking may be appropriately determined according to the defect information in the width direction and the use of the steel sheet.

In the above, the case where the ink marker device is installed in the defect marking device 8 and the defect position is marked, or the defect-marked coil is further worked has been described. A member marking device may be provided to mark a defect position with a polishing member.

In a defect marking apparatus using a polishing member, a polishing member such as a grindstone attached to the tip of a cylinder or a nonwoven fabric containing an abrasive is directly pressed against the steel plate 1 or pressed against the steel plate 1 while rotating a brush roll. To mark.

In the case of a defect marker device using a polishing member, the response of the marking is somewhat inferior to that of the ink marker device. In consideration of the fact that the color cannot be changed, except for performing the marking display according to the defect clade, the same defect marking as in the case of using the ink marker device, the operation of the coil with the defect marking is possible. .

When a polishing member is used, it is preferable that the marking length is slightly longer than the marking length using ink in consideration of tracking accuracy and responsiveness. Specifically, 0.5 m to 1.0 m are added before and after to the defect length discriminated by the centralized control panel 8, respectively, and 1 m to 2 m from the defect length.
Outputs a command for long marking. In the case of a point-like defect having a length of about several mm or less, a command is output to add 0.25 m to 1.0 m before and after, respectively, to perform marking. The line width of the marking is optimally in the range of 50 to 200 mm from the viewpoint of easy detection by visual inspection and easy detection by the defect marking detection device 9. FIG.
FIG. 4 is a diagram showing a state of a defect portion position and a defect marking position. A harmful defect 20 is within a display range in a length direction of the defect marking 21.

When two ink marker devices are installed,
As shown in FIG. 14, the color of the ink was changed according to the defect grade. However, when a polishing member was used, the color could not be changed. When two polishing member marker devices are installed, change the marking line according to the defect grade. (For example, if the harmful defect of the purchaser is clear, perform marking with one line, and if the defect is difficult to distinguish, use two lines. By performing marking, the same operation as that of the ink marker device can be performed.

FIG. 23 shows an example of a defective portion and a defective marking position in a case where marking is performed using two polishing member marker devices. The harmful defect portion 20 is displayed by one defect marking 21a, and the difficult-to-identify defect 22 is displayed by two defect markings 21b.

When the defect marking is performed using a polishing member, there is no problem of shading such as paint, so that no pressing flaw is generated on the surface of the steel sheet, and even if the coil is coated with oil, the surface of the steel sheet can be surely formed. Can be marked. Further, oiling may be performed immediately after the marking, and a drying device such as the case of marking with ink is not required, and a simpler device can be obtained.

When the marking is performed using a brush roll on the grinding member, a brush roll capable of marking the entire width of the steel plate may be provided as necessary, and the marking may be performed over the entire width of the steel plate.

[0083]

As described above, according to the present invention, harmful defects can be reliably and easily formed without causing flaws on the steel plate by the defect marking and regardless of whether or not oil such as rust-preventive oil adheres to the surface of the steel plate. It is possible to manufacture a coil with a defect marking that can be identified.

Further, by tracking the defect position on the steel sheet surface and marking the harmful defect part, the purchaser can easily detect the defect part. In addition, the harmful defect portion can be rolled and shipped with a required coil length, thereby improving the work efficiency of the purchaser.

Further, since the marking display method is changed according to the degree of the defect, or the appropriate marking display is performed in consideration of the defect name, the degree of the defect, and the use of the steel sheet, the effect of improving the work efficiency is further improved.

[0086] By using the ink marker device, by displaying the defect marking color in consideration of the background color of the steel sheet according to the type of the steel sheet, the effect of improving the working efficiency and preventing the overlooking of the defect can be further improved. Excellent.

With the use of the grinding member marker device, even the oiled coil can be reliably marked on the surface of the steel sheet.
Further, since a drying device as in the case of marking with ink is not required, a simpler device can be provided.

Further, for the steel plate manufacturer, the operation of removing the harmful defect portion is facilitated and the work efficiency is greatly improved, and the excessive defect removal operation is also unnecessary for the defect which is difficult to determine, thereby improving the yield.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of the arrangement of main facilities of a coiling line for a first steel sheet used for describing an embodiment of the present invention.

FIG. 2 is a diagram showing an example of the arrangement of main facilities of a second steel sheet coiling line used for describing the embodiment of the present invention.

FIG. 3 is a diagram showing an example of an arrangement of main components of a coiling line for a third steel plate used for describing the embodiment of the present invention.

FIG. 4 is a diagram showing an example of arrangement of main facilities of a fourth steel sheet coiling line used for describing the embodiment of the present invention.

FIG. 5 illustrates an example of a CRT display screen.

FIG. 6 is a diagram showing a state of a defect portion position and a defect marking position.

FIG. 7 is a diagram showing an example of equipment arrangement when one defect marking device and one defect marking detection device are provided.

FIG. 8 is a diagram showing an example of equipment arrangement when two defect marking devices and two defect marking detection devices are provided.

FIG. 9 is a diagram showing an example of equipment arrangement when one defect marking device and one ink drying device are provided.

FIG. 10 is a diagram showing an example of a facility arrangement in a case where one defect marking device, one defect marking detection device, and one ink drying device are provided.

FIG. 11 shows a defect marking device and an ink drying device, each of which is 2
The figure which shows the example of the equipment arrangement | positioning at the time of providing.

FIG. 12 is a diagram of equipment arrangement when two defect marking devices, two defect marking detection devices, and two ink drying devices are provided.

FIG. 13 is a diagram showing an example in which a defect is marked using one defect marking device.

FIG. 14 is a diagram showing an example in which harmful defects and difficult-to-discriminate defects are separately marked using two defect marking devices.

FIG. 15 is a diagram showing an example of arrangement of main facilities of a line including a defect marking device and a defect marking detection device.

FIG. 16 is a diagram showing an example of an arrangement of main components of another line including a defect marking device and a defect marking detection device.

FIG. 17 is a diagram showing an example of an arrangement of main facilities of a line including an inspection table and a defect marking detection device in addition to the defect marking device and the defect marking detection device.

FIG. 18 is a diagram showing an example of arrangement of main facilities of a coiling line including a defect marking detection device.

FIG. 19 is a diagram showing an example of arrangement of essential equipment of a shear line including a defect marking detection device.

FIG. 20 is a diagram showing an example in which defect marking is performed on a defective portion.

FIG. 21 is a diagram showing an example in which defect marking is performed at the same location on both sides in the width direction of the steel sheet, regardless of the location of the defective portion.

FIG. 22 is a diagram showing a state of a defect portion position and a defect marking position.

FIG. 23 is a diagram showing an example in which harmful defects and difficult-to-identify defects are separately marked using two defect marking devices.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steel plate 2 Detector 3 Surface defect meter 4 Signal processing part 5, 5a CRT 6 Centralized control panel 7 Secondary judgment input device 8, 8a, 8b Defect marking device 9, 9a, 9b Defect marking detection device 10 Tension reel 11 Transport roll Reference Signs List 12 pulse transmitter 13 steel plate transport distance calculation device 14 external storage device 15 cutting machine 16 inspection table 17 oiler 18 trimmer 19 payoff reel 20 harmful defect 21, 21a, 21b defect marking 22 difficult-to-discriminate defect 23 upper-level computer 24 alarm device 25, 25a , 25b gantry 26 moving device 27 motor 28 gate switching device 29 non-defective Piler 30 defective Piler 31 steel plate transport length display 32 cleaning liquid injection device 33 cleaning liquid wiping device 34 magnetic flaw detector (internal defect meter) 35 magnetic sensor 36 signal processing unit 40 , 4 a, 40b ink drying device

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hideji Kanto 1-2-1, Marunouchi, Chiyoda-ku, Tokyo, Japan Inside Nihon Kokan Co., Ltd. (72) Inventor Masahiro Iwabuchi 1-1-2, Marunouchi, Chiyoda-ku, Tokyo, Japan Inside the Kokan Co., Ltd. (72) Kozo Harada, Inventor 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Japan Inside the Kokan Co., Ltd. (72) Shinichi Asanaga 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Japan Inside Steel Tube Co., Ltd. (72) Inventor Shigemi Fukuda 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Japan Steel Tube Co., Ltd.

Claims (18)

[Claims] 1. A steel sheet is continuously processed in a continuous processing line for a steel sheet provided with a surface defect meter for detecting surface flaws and an ink marker device for marking a defect position with ink, or an internal defect meter for detecting a defect inside the steel sheet. The processing process and the surface flaw meter detect the surface flaw of the steel sheet, and based on the detected flaw information, calculate the flaw name, flaw grade, flaw length, and flaw position in the width direction. The process of identifying defects and harmless defects, and also detecting the internal flaws of the steel plate with the internal defect meter, calculating the defect length and width direction defect position based on the detected flaw information,・
Step of identifying a harmless defect, the harmful defect, for the difficult-to-discriminate defect, each performs tracking of the flaw position,
Marking the defective position with ink when the defective portion reaches the ink marker device. 2. For surface defects, identification of harmful defects, difficult-to-identify defects, and harmless defects is performed based on the defect name, defect grade, defect length, defect position in the width direction, defect position on the front and back surfaces, and the use of the steel sheet. The defect-marked coil according to claim 1, wherein, for the internal flaws, the harmful / harmless defect is identified based on the length of the defect, the defect position in the width direction, and the use of the steel sheet. Manufacturing method. 3. A line provided with a surface defect meter or an internal defect meter in advance, wherein a defect name,
Calculate the defect grade, defect length and defect position in the width direction,
Further harmful defects, difficult-to-discriminate defects are identified, or further, for the internal flaw of the coil, the defect length, the defect position in the width direction is calculated, further harmful defects / harmless defects are identified, and the coil, The step of loading the steel sheet in a continuous processing line provided with an ink marker device for marking with ink and performing the continuous processing, and the information on the previously identified harmful defect / hard-to-identify defect, And marking the defective position with ink at a time when the coil reaches the ink marker device. 4. An inspector re-determines a defect identified by the surface defect meter as a difficult-to-identify defect, identifies the defect as a harmful defect or a harmless defect, and marks the defect position of the harmful defect with ink. The method of manufacturing a coil with a defect marking according to claim 1. 5. A defect detected by the surface defect meter as a difficult-to-identify defect, an alarm is output, automatic deceleration is performed, and an inspector re-determines the difficult-to-identify defect. Item 5. A method for manufacturing a coil with a defect marking according to any one of Item 4. 6. A defect image display and a defect position display when an inspector re-determines a defect identified as a difficult-to-identify defect by the surface defect meter. A method for manufacturing a coil having the defect marking described therein. 7. The defect marking according to claim 1, wherein the position of the defect marking is changed based on the defect information in the width direction of the surface defect meter and the internal defect meter. Manufacturing method of coil. 8. The method according to claim 1, wherein the position of the defect marking is changed according to the use of the steel sheet.
The method of the coil with the defect marking according to any one of the above items. 9. The method for producing a defect-marked coil according to claim 1, wherein marking is performed by distinguishing between harmful defects and difficult-to-identify defects. 10. The method according to claim 1, wherein harmful defects and difficult-to-discriminate defects are distinguished by changing the color of the defect marking.
A method for manufacturing a coil with a defect according to any one of claims 9 to 9. 11. The color of a defect marking is changed according to the type of a steel sheet.
13. The method for producing a coil with a defect marking according to any one of the above items. 12. The coil according to claim 1, wherein a defect marking detection device is installed downstream of the ink marker device to monitor a marking state. Production method. 13. The method according to claim 1, wherein the threshold value of the defect marking detection device is changed according to the type of the steel sheet. 14. The method according to claim 1, wherein an ink marker device and a defect marking detection device are set to follow the defect marking position. Method. 15. An ink drying device is provided downstream of an ink marker device.
5. The method for producing a coil with a defect marking according to any one of the above items 4. 16. The defect marking according to claim 1, wherein an ink marker device, a defect marking detection device, and an ink drying device are set to follow the defect marking position. Manufacturing method of coil. 17. The method according to claim 1, wherein threshold values of harmful defects and harmless defects are changed according to the use of the steel sheet. 18. A method according to claim 1, wherein a polishing member marker device for marking with a polishing member is provided in place of the ink marker device using ink. A method of manufacturing a coil with a defect marking, wherein the marking is performed with a polishing member instead of the marking with a coil.