METHOD FOR PROCESSING A METAL STRIP, METHOD OF APPLYING MARKS, AND MARK PRINTING DEVICE
Patent Information
- Authority / Receiving Office
- MX · MX
- Patent Type
- Patents
- Current Assignee / Owner
- JFE STEEL CORP
- Filing Date
- 2023-03-28
- Publication Date
- 2026-05-19
Smart Images
Figure MX433983B0
Abstract
Description
METHOD FOR PROCESSING A METAL STRIP, METHOD OF APPLYING MARKS, AND MARK PRINTING DEVICE FIELD OF INVENTION The present invention relates to a technology for sequentially processing a metal strip on a plurality of processing lines, such as a processing line for manufacturing a cold-rolled steel sheet. The present invention particularly relates to a technology that features a method for tracking the position of the strip across a plurality of processing lines. BACKGROUND OF THE INVENTION As for conventional position tracking processing, there is a technology described in Patent Literature 1, for example. Patent Literature 1 uses, in a continuous processing line of thin steel sheets, a spot tracking system using welding spots and a method for calculating the transport position and coil length based on the detection values of the number of rotations of a roller using a PLG (pulse generator). List of Appointments Patent Literature Patent Literature 1: JPH07-32017 A BRIEF DESCRIPTION OF THE INVENTION Technical Problem The tracking system carries the risk of deviation (error) due to slippage or similar issues between the steel sheet being conveyed and a detection roller. Therefore, there is a risk of deviation occurring between a value measured by one processing line and a value measured by another; that is, a deviation occurs in the tracking position. Patent Literature 1 corrects for the deviation caused by metal strip slippage at the welding point. However, when a coil length deviation occurs, the deviation persists until the welding point with the next coil. Therefore, in Patent Literature 1, even though the amount of each deviation is small, the tracking position deviation becomes large when slippage occurs multiple times. This raises the problem of a longitudinal direction error exceeding the allowable length in the tracking position on the next processing line. In an electroplating line applied to a steel sheet with a defect mark, the amount of plating adhesion to a portion of the steel sheet's edge tends to increase due to current concentration. Therefore, trimming the edge portion is required to improve quality. However, a customer might use different parts of the defect mark even for a section of the metal strip with the defect mark. Therefore, it is preferable to print the defect mark as close to the edge portion as possible. Thus, when trimming the edge portion where the plating adhesion is excessively high, the defect mark (position specification mark) already printed on the edge portion is also cut away.Therefore, in a cutting processing line for the edge part, the reprinting of the defect mark needs to be done on the metal strip. However, conventionally, there is a risk of a deviation of an amount equal to or greater than a predetermined quantity in the tracking position between processing lines. Therefore, when printing is carried out on another processing line based on the longitudinal position of the roll compared to the tracking position on one processing line, the print position deviates significantly due to a deviation resulting from slippage or similar factors described above. Therefore, the reprinting of a mark that requires high precision, such as a defective print, has conventionally required that it be done manually. It is considered that when the defect mark is printed on the inside in the direction of the width to be trimmed, reprinting is not required. However, in general, the required accuracy for edge printing is 2 mm, for example, which is tighter than the curvature of the processing line. For the curvature of the metal strip, edge printing can always be held on the edge of the metal strip with an accuracy within 2 mm by moving a marking printing unit using an edge-tracking device. However, a trimmer unit cannot be moved. Therefore, it is considered that after trimming the edge, edge reprinting can be performed. However, a method of leaving the defect mark printed before trimming is not practical. Therefore, under the current circumstances, reprinting is carried out after the edge is trimmed. The present invention has been developed focusing on the points described above. It is an object of the present invention to perform the reprinting of a mark with high precision on a processing line different from the processing line on which the printing was performed. Solution to the Problem To solve the problems, one aspect of the present invention is a method for processing a metal strip by sequentially applying processing to the same metal strip in a plurality of processing lines that include: applying a first position specification mark to the metal strip in a first processing line selected from the plurality of processing lines; applying a plurality of reference marks configured with a predetermined regularity along the longitudinal direction to the metal strip in the first processing line or in an upstream processing line of the first processing line; cutting a portion of the metal strip, to which the first position specification mark has been applied, in a second processing line as a downstream processing line of the first processing line;After cutting, apply a second position specification mark to the metal strip in the same longitudinal position as the longitudinal position of the first position specification mark; and, before applying the second position specification mark, detect at least one of the plurality of reference marks and calibrate the tracking information to apply the second position specification mark based on the position information of the reference mark detected on the second processing line. One aspect of the present invention is a method for processing a metal strip by sequentially applying processing to the same metal strip in a plurality of processing lines, including: applying a first position specification mark to the metal strip in a first processing line selected from the plurality of processing lines; applying a plurality of reference marks configured with a predetermined regularity along the longitudinal direction to the metal strip in the first processing line or in an upstream processing line of the first processing line; cutting a portion of the metal strip, to which the first position specification mark has been applied, in a second processing line as a downstream processing line of the first processing line;and, after cutting, apply a second position specification mark to the metal strip in the same longitudinal position as the longitudinal position of the first position specification mark, wherein the longitudinal position of the first position specification mark is associated with a reference mark selected from the plurality of reference marks, and, in the second processing line, the longitudinal position of the first position specification mark is specified based on position information from the selected reference mark, and the application position of the second position specification mark is determined. One aspect of the present invention is a mark application method for applying a mark to a metal strip by sequentially applying processing to the same metal strip in a plurality of processing lines, including: applying a first position specification mark that specifies the position to the metal strip in a first processing line selected from the plurality of processing lines; applying a plurality of reference marks configured with a predetermined regularity along the longitudinal direction to the metal strip in the first processing line or in an upstream processing line of the first processing line;applying a second position specification mark at the same longitudinal position as the longitudinal position of the first position specification mark on a second processing line as a downstream processing line of the first processing line; and, in applying the second position specification mark, determining a position at which the second position specification mark is applied by specifying the longitudinal position of the first position specification mark based on the position of a reference mark selected from the plurality of reference marks. An aspect of the present invention is a mark application device for applying, in a second processing line selected from a plurality of processing lines sequentially applying processing to the same metal strip in the plurality of processing lines, a second position specification mark in the same longitudinal position of the metal strip as the longitudinal position of a first position specification mark that has been applied in a first upstream processing line of the second processing line, including: a reference mark printing device configured in the first processing line or in an upstream processing line of the first processing line and printing a reference mark on the metal strip;A reference mark printing processing unit that carries out the printing processing of a plurality of reference marks configured with a predetermined regularity along the longitudinal direction of the metal strip by means of the reference mark printing device; an associated information acquisition unit that obtains associated information in which the selected reference mark from the plurality of reference marks is associated with the first position specification mark; a mark detection unit provided in the second processing line and that detects the reference mark; a reprinting device configured in the second processing line and that applies the second position specification mark to the metal strip;and a reprinting processing unit that performs the processing of specifying the longitudinal position of the metal strip of the first position specification mark from the associated information obtained by the associated information acquisition unit and reference mark position information detected by the mark detection unit, and printing the second position specification mark by means of the reprinting device based on the specified longitudinal position. Advantageous Effects of the Invention According to aspects of the present invention, a position tracking deviation is compensated for (calibrated) by reference marks configured in the longitudinal direction according to a specific rule. As a result, aspects of the present invention enable highly accurate printing in the same longitudinal position on different processing lines. More specifically, aspects of the present invention can suppress a tracking deviation to a low degree. Therefore, aspects of the present invention make it possible to automate the printing process that has previously been performed manually by reprinting in the same position. BRIEF DESCRIPTION OF THE FIGURES FIG. 1 is a view to illustrate an equipment configuration of a first processing line according to a modality based on the present invention. FIG. 2 is a plan view to illustrate a printing device configuration. FIG. 3 is a view to illustrate a configuration of a first processing control unit. FIG. 4 is a view that illustrates a set of print performance data 11. FIG. 5 is a view illustrating an example of printing that corresponds to FIG. 4. FIG. 6 is a view that illustrates a set of print performance data 11. FIG. 7 is a view to illustrate an equipment configuration of a second processing line according to the modality based on the present invention. FIG. 8 is a view to illustrate a configuration of a second processing control unit. FIG. 9 is a view illustrating an example of printing that corresponds to FIG. 4. FIG. 10 is a view illustrating an example of reprinting. FIG. 11 is a view to illustrate a comparative example. DETAILED DESCRIPTION OF THE INVENTION Next, one embodiment of the present invention will be described with reference to the figures. This embodiment refers to a method for processing a metal strip and processing equipment that sequentially applies processing to the same metal strip (steel sheet or similar) on a plurality of processing lines. This embodiment provides a description that assumes a metal strip manufacturing processing line, particularly a zfrQpnn / rznz / B / GALA manufacturing processing line for cold-rolled steel sheet. It is observed that the present invention is not limited to the manufacturing processing line for a metal strip. The present invention is applicable to any processing equipment for the sequential processing of the same metal strip on a plurality of processing lines. This embodiment provides a description by taking as an example a metal strip that is processed while being unwound into a coil, and then unwound again on each processing line. Therefore, the metal strip is sometimes referred to as a coil. The present invention is applicable even when the metal strip is not wound on each processing line. The term “longitudinal direction” as used herein refers to a longitudinal direction (transport direction) of the metal strip to be processed. This modality includes at least a first processing line and a second processing line as a plurality of processing lines. The first processing line is an application line for a first position specification mark to the metal strip. The second processing line is a downstream processing line from the first processing line. The second processing line applies a second position specification mark at the same longitudinal position as the first position specification mark. In this configuration, the first position specification mark is a defect mark indicating the longitudinal position of a defect present in the metal strip. The second position specification mark is a reprinted defect mark. The first and second position specification marks may not have the same shape. One or more additional processing lines may be provided between the first and second processing lines. In this configuration, the first processing line is an electroplating line. The first processing line may not be the electroplating processing line. (First processing line) As illustrated in FIG. 1, the equipment configuration of the first processing line includes an unwinding reel 1, a tension reel 2, a PLG 3, a plating processing unit 4, a defect inspection device 5, a printing device 6, and a first line control unit 7. <Carrete de desenrollado 1 y Carrete de tensión 2> The present invention is configured such that the unwinding reel 1 and the tension reel 2 carry out the unwinding / winding processing of a metal strip 10 in the form of a coil, and the metal strip 10 is transported from the unwinding reel 1 to the tension reel 2. <Unidad de procesamiento de chapado 4> The plating processing unit 4 is set up on the upstream side of the defect inspection device 5 and carries out the plating application processing to the surface of the metal strip 10. <PLG 3> The PLG 3 containing an encoder and other components detects the number of roller rotations that rotate with the transport of the metal strip 10, and sends a detection signal to the first line control unit 7. <D¡sposítivo de inspección de defectos 5> The defect inspection device 5 is a device for detecting defects on the surface and inside of the metal strip 10 to be transported, and, upon detecting a defect, sends a defect detection signal to the first line control unit 7. <Dispos¡tivo de impresión 6> The printing device 6 is configured on the downstream side of the defect inspection device 5. The printing device 6 includes a printing device for defect marks 6A and a printing device for reference marks 6B as illustrated in FIG. 2. [6A Defect Mark Printing Device] The defect mark printing device 6A is configured on the operator side (hereinafter also referred to as the “OP side”) of the metal strip 10, for example. The defect mark printing device 6A prints a defect mark K by ejecting ink to an end section on the OP side of the metal strip 10 based on a print signal from the first line control unit 7. [Printing device for reference marks 6B] In this mode, the 6B reference mark printing device is configured on one side of the unit (hereinafter also referred to as the “DR side”) of the metal strip 10, for example. The 6B reference mark printing device sequentially prints a reference mark S by ejecting ink to the end portion on the DR side of the metal strip 10 based on the print signal from the first line control unit 7. More specifically, in this mode, the defect mark K is printed on one end portion in the width direction of the metal strip 10, and the reference mark S is printed on the other end portion. The OP side is the operator's side in the direction of the metal strip width 10. The DR side refers to the side opposite the OP side, and refers to the equipment's side in the direction of the metal strip width 10. <Primera unidad de control de línea 7> The first line control unit 7 contains a program logic controller (PLC) or similar. The first line control unit 7 includes a first position tracking unit 7A, a defect mark printing processing unit 7B, and a reference mark printing processing unit 7C, as illustrated in FIG. 3. <Primera unidad de seguimiento de posición 7A> The first position tracking unit 7A performs linear speed detection of the metal strip 10 and known tracking processing for longitudinal position from a portion of the tip of the metal strip 10 based on the detection signal from PLG 3, and arithmetically operates the position tracking information. <L)nidad de procesamiento de impresión de marcas de defectos 7B> zfrQpnn / rznz / B / YiAi Once the defect detection signal from defect inspection device 5 is received, the defect mark printing processing unit 7B acquires the longitudinal position of the defect detection location based on the position tracking information from the first position tracking unit 7A. The defect mark printing processing unit 7B supplies a printing signal to the defect mark printing device when the defect detection location in the longitudinal direction reaches the printing position as determined by the defect mark printing device 6A, based on the line speed. The defect mark printing processing unit 7B supplies the printing signal taking into account an operating delay. Therefore, the defect mark K is printed on the final portion of the metal strip 10 on the OP side. The defect mark printing processing unit 7B sends print performance data 11 from the printing of the defect mark K by means of the printing device for defect marks 6A to a database 8. Each of the print performance data 11 includes data of a mark type and the print position which is longitudinal position information of the metal strip 10, for example. <Unidad de procesamiento de impresión de marcas de referencia 7C> The reference mark printing processing unit 7C performs processing based on tracking information from the first position tracking unit 7A and the linear speed of the metal strip 10. More specifically, the reference mark printing processing unit 7C sequentially sends a printing signal to the reference mark printing device 6B so that the reference marks S are printed at equal intervals along the longitudinal direction from a predetermined reference position. The predetermined reference position is the reference position in the longitudinal direction away from the unwound end of the metal strip 10 by a preset distance. Therefore, the reference marks S are applied sequentially at equal intervals (e.g., every 10 m) along the longitudinal direction to the end portion on the DR side of the metal strip 10.The plurality of reference marks S may not be printed at equal intervals but may be printed to be configured with a predetermined regularity along the longitudinal direction. The reference mark printing processing unit 7C sends the print performance data 11 from the reference mark printing S via the reference mark printing device 6B to database 8. Each of the print performance data 11 includes data of a mark type and the print position which is the longitudinal position information, for example. It is preferable to apply identification information to identify each reference mark S to each of the plurality of reference marks S. As identification information, the numbers in ascending order of the print can be exemplified. The S reference mark plurality printing processing line can be a line on the upstream side of the first processing line. When the printing processing line for the plurality of reference marks S and the printing processing line for the defect mark K are the same line (first processing line), the following configuration is preferred. More specifically, it is preferable that the printing device for defect marks 6A and the printing device for reference marks 6B face each other in the direction of the width of the metal strip 10 through the transport direction of the metal strip 10, as illustrated in FIG. 2. When the printing processing line for the plurality of reference marks S and the printing processing line for the defect mark K are the same line, the configuration is as follows, for example.More specifically, the printing of the defect mark by the defect mark printing device 6A and the printing of the reference marks by the reference mark printing device 6B do not need to be performed simultaneously. It does not matter which is done first, as long as the processing takes place on the same line (first processing line). This is because, when the processing is carried out on the same processing line, the position information of the defect mark and the position information of the reference marks have no relative deviation or only a slight deviation in longitudinal position. Between lines, the tracking information on each line is deviated by, for example, around 3% due to the influence of slippage or similar factors. This causes a deviation of around 30 m / 1000 m, for example. The plurality of reference marks S are configured at equal intervals, for example, along the longitudinal direction of the metal strip 10. Therefore, the first or last reference mark S can be printed near an end portion in a longitudinal direction of the metal strip 10, for example, and thus the accuracy of the tracking position information is high. A case is assumed here where the defect mark K is applied on a processing line subsequent to the processing line where the reference marks S are applied. In this case, when the printing position of the defect mark K is specified while the tracking position is calibrated by the position of the reference mark S, the relative relationship between the longitudinal positions of the reference mark S and each defect mark K is highly accurate. (Superior computer 9) A top computer 9 is a computer superior to the first line control unit 7 and a second line control unit 26 described below. The top computer 9 includes an associated information acquisition unit 9A. cAssociated information acquisition unit 9A> The associated information acquisition unit 9A runs after processing is complete on the first processing line. This unit processes the print performance data configuration 11 in database 8 in ascending order, using longitudinal position as a key to create a print performance data group 12, as illustrated in Figure 4. Figure 4 illustrates a case of end-cutting the roll using a cutting device (not shown). A processing performance data point for the cutting position is also obtained as part of the print performance data 11. The print performance data group 12 illustrated in Figure 4 is an example of a case where the defect mark K and reference marks S, illustrated in Figure 5, are applied to the metal strip 10. This makes it possible to associate each defect mark K with one or two or more reference marks S selected from the plurality of reference marks S. Currently, in a case where identification information applies to reference mark S, for example, a symbol can be added to reference mark S to specify the position of defect mark K in print performance data group 12. For example, an identification number can be printed alongside reference mark S. The numbers to be printed can be either ascending or descending in each print run using a counter, for example. In addition, a data set of reference mark S information to specify the position of the defect mark K and information on the separation distance from the reference mark S to the target defect mark K can be provided separately. The reference mark S to specify the position of the defect mark K cannot be the reference mark S closest to the defect mark K. This assumes a case where an odd number of other processing lines are present between the first and second processing lines. In this case, the unwinding directions of the coil forming the metal strip 10 are the same in the first and second processing lines. On the other hand, consider a case where there are no other processing lines, or an even number of other processing lines are present between the first and second processing lines. In this case, the directions of the coil to be processed in the first and second processing lines are opposite. Therefore, the outer winding of the coil to be processed in the first processing line becomes the core of the coil to be processed in the second processing line. In this case, the processing of the print performance data configuration 11 in database 8 is carried out in descending order, with the longitudinal position as a key. Then, the processing of converting the print position to the longitudinal position from the end of the roll is carried out, and the print performance data group 12 is created as illustrated in FIG. 6. In this case, the cutting position, which has become the rear end in the first processing line, becomes the front end in the second processing line. The processing of the associated information acquisition unit 9A can be carried out by the first line control unit 7 and the second line control unit 26 described below. (Second processing line) As illustrated in FIG. 7, the equipment configuration of the second processing line includes an unwinding reel 20, a tension reel 21, a PLG 22, a printed mark recognition device 23, a trimming device 24, a reprinting device 25, and the second line control unit 26. <Carrete de desenrollado 20 y Carrete de tensión 21 > The unwinding reel 20 and the tension reel 21 carry out the unwinding / rewinding process of the metal strip 10 into the coil form. The present invention is configured such that the metal strip 10 is conveyed from the unwinding reel 20 to the tension reel 21. zfrQpnn / rznz / B / YiAi<PLG 22> The PLG 22, which includes an encoder and the like, detects the number of roller rotations that rotate with the transport of the metal strip 10, and supplies a detection signal to the second line control unit 26. <Dispositivo de reconocimiento de marcas impresas 23> The printed mark recognition device 23 constitutes a mark detection unit. The printed mark recognition device 23 contains an imaging device, such as a camera, which detects the reference mark S applied to the surface of the metal strip 10 and sends a detection signal to the second line control unit 26. At this time, it may be acceptable for a recognition counter to be provided, and, once the reference mark S is detected, the counter is decremented or increased to improve the degree of identification of the detected reference mark S. <Dispositivo de recorte 24> The trimming device 24 in this mode is configured on both sides in the direction of the width of the metal strip 10 and continuously cuts both parts of the end edges of the metal strip 10 to be transported. The trimming device 24 in this mode performs the cutting before reprinting in the reprinting device 25. Consider a case where the defect mark is reprinted only on one side of the end piece in the width direction. In this case, it may be acceptable for the trimming device to be configured on the downstream side of the reprint device 25, and for an end piece on the S side of the reference mark (DR side) to be trimmed after reprinting. The trimming device is a trimming device that cuts the end piece on the S side of the reference mark (DR side) present on the other side of the end piece. In this mode, the defect marks are reprinted on both end parts in the width direction, and therefore the end parts on both sides are cut at the same time. It is also considered that, after reprinting by the reprinting device 25, cutting processing by the trimming device 24 is performed. However, in this case, the reprinting is done within the defect mark printed on the first processing line. However, a metal strip that is to undergo such processing does not require the application of reference marks and, in many cases, does not require reprinting. Furthermore, there is also the problem that, when reprinting is done before cutting the final parts, the cutting width becomes larger than necessary. <Dispositivo de reimpresión 25> The reprinting device 25 of this mode ejects ink to the end portion of the metal strip 10 based on the print signal from the second line control unit 26 to reprint the defect marks K which serve as the second position specification mark. <Segunda unidad de control de línea 26> The second line control unit 26 contains a program logic controller (PLC) or similar. The second line control unit 26 includes a second position tracking unit 26A and a reprint processing unit 26B as illustrated in FIG. 8. <Segunda unidad de seguimiento de posición 26A> The second position tracking unit 26A carries out the detection of the linear speed zfrQpnn / rznz / e / γΐΛΐ of the metal strip 10 and the known tracking processing for the longitudinal position from the tip part of the metal strip 10 based on the detection signal from PLG 22, and arithmetically operates the position tracking information. The second position tracking unit 26A in this mode refers to the print performance data set 12 created each time a print detection signal from the print mark recognition device 23 is received. The second position tracking unit 26A then calibrates the longitudinal position information (tracking information) obtained by the PLG 22's detection of the corresponding reference mark S against the longitudinal position of the print performance data 11, thereby improving the accuracy of the tracking position information. <L)n¡dad de procesamiento de reimpresión 26B > The reprint processing unit 26B refers to the print performance data group 12 created based on the position tracking information from the second position tracking unit 26A. The reprint processing unit 26B then determines whether the longitudinal position of the print performance data 11 to the next defect mark K reaches the print position via the reprint device 25 in the longitudinal direction. When this is determined as described above, the reprint processing unit 26B supplies a print signal to the reprint device 25. The print signal is supplied taking into account an operating delay. Thus, the defect mark K is reprinted on the final trimmed portion on the OP side of the metal strip 10. Alternatively, if a reference mark detection signal S from the print mark recognition device 23 is received, the reprint processing unit 26B refers to the created print performance data group 12. The reprint processing unit 26B determines whether the detected reference mark S is the previous reference mark S on the upstream side of the print performance data 11 to the next defect mark K. When the detected reference mark S is the previous reference mark S on the upstream side of the print performance data 11 to the next defect mark K, the reprint processing unit 26B performs the following processing.More specifically, the reprint processing unit 26B specifies the longitudinal position of the defect marks K from the reference mark position information S detected by the printed mark recognition device 23 and the print performance data group 12. The reprint processing unit 26B then supplies a print signal to the reprint device 25 based on the line speed. This processing is carried out when the position obtained by adding the separation distance from the reference mark S to the defect marks K to the longitudinal position of the mark determined in the longitudinal direction reaches the print position by the reprint device 25. The print signal is supplied considering an operating delay. Thus, the defect mark K is reprinted on the final trimmed portion on the OP side of the metal strip 10. (Operations and others) In this configuration, the reference marks S are printed at equal intervals on the end portion of the DR side of the metal strip 10, as illustrated in FIG. 5, on the first processing line. On the first processing line, the defect mark K is printed on the zfrQpnn / rznz / e / γΐΛΐ side. OP of the metal strip 10. In the first processing line, the print performance data 11 of the defect mark K and the plurality of reference marks S are stored sequentially in the database 8. The plurality of print performance data 11 stored in database 8 is sorted in ascending or descending order with longitudinal position as a key to form the print performance data group 12 (see FIGS. 4, 6). Furthermore, in this mode, the reference mark S is detected, and the position tracking information is calibrated using the print position information in the print performance data 11 of the detected reference mark S on the second processing line. This allows for the calibration of a print deviation. As a result, the accuracy of the position tracking information to the position of the defect mark K on the second processing line is improved. In the second processing line, the end portion on the OP side of the metal strip 10 is trimmed, and then the defect mark K is reprinted in the same longitudinal position as the longitudinal position of the printed defect mark K. At this time, the longitudinal position for reprinting is specified with the position of the reference mark S as a reference. In this case, we assume that the longitudinal directions of the coil in the first and second processing lines are the same. In this case, the reprint position of the defect mark K can be specified from a separation distance LA in the longitudinal direction of the reference mark S on the upstream side of the target defect marks K, as illustrated in FIG. 5, based on print performance data set 12. On the other hand, consider a case where the longitudinal directions of the coil in the first and second processing lines are reversed. In this case, the reprint position of the defect mark K can be specified from a separation distance LB in the longitudinal direction from the reference mark S on the upstream side of the target defect mark K, as illustrated in FIG. 9. Since a distance LO between adjacent reference marks S is already known, the separation distance LB can be determined based on LO - LA - LB. At the position advanced by the separation distance LA or LB from the tracking position of the selected reference mark S from the plurality of reference marks S, the defect mark K, as the second position specification mark, is reprinted as illustrated in FIG. 10. In FIG. 10, the reprinting of the defect mark K is carried out on the right and left end portions, but the reprinting can be carried out on only one side. In FIG. 10, the reference numbers 10A indicate cut portions from the end portions on the metal strip 10. Alternatively, in this mode, reprinting is performed by specifying the reprint position in the longitudinal direction based on the print performance of the defect mark K, while the tracking information is calibrated by the reference mark S on the second processing line. In theory, it is possible to detect the defect mark K, which has been printed on the first processing line zfrQpnn / rznz / e / γΐΛΐ, on the second processing line and print it in the same longitudinal position on the steel sheet as the longitudinal position of the defect mark K, without printing the plurality of reference marks S. However, there is a possibility that the defect mark K may still not be detectable or may be overlooked. This is due to the following reasons. When the printed mark is detected at line speed, a camera cannot recognize the type of mark, and therefore only the presence or absence of the print is detected. Therefore, when the K defect marks are densely continuous, as illustrated in Figure 11, there is a possibility that multiple marks will be recognized as one mark, and some of the K defect marks will not be detected. There is also the possibility of recognizing and over-detecting a dirt mark 30 as the K defect mark. When such two identification errors occur, the K defect marks are shifted by one, for example. This results in a discrepancy between the defect type and the printed mark for all defects beyond the mark where the identification error occurs, leading to a serious quality error. Conversely, in this mode, the use of multiple reference marks S configured according to a predetermined rule allows for the reprinting of the defect mark K based on its distance from the reference mark S. Therefore, the possibility of missed detections due to dense clusters of defect marks K can be reduced. Furthermore, the identification of dirt 30 as the defect mark K can be avoided. Furthermore, in this mode, the S reference marks are printed at predetermined intervals, such as fixed-length intervals. Therefore, the interval deviation between the S reference marks is small, and the edges of the printed marks can be masked. This makes it possible to avoid the mistake of mistaking dirt or similar debris for a mark. Additionally, since the non-detection of the S reference mark can be determined by its presence or absence in a part where the S reference mark is supposed to be detected, the non-detection can be identified quickly. As described above, in this mode, the plurality of reference marks S is printed and the reprinting is done with the plurality of reference marks S as a reference, and thus the defect mark K can be reprinted more accurately. (Advantageous Effects) (1) This modality is a method for processing a metal strip to sequentially apply processing to the same metal strip in a plurality of processing lines that includes: applying a first position specification mark to the metal strip in a first processing line selected from the plurality of processing lines; applying a plurality of reference marks configured with a predetermined regularity along the longitudinal direction to the metal strip in the first processing line or in an upstream processing line of the first processing line; cutting a portion of the metal strip, to which the first position specification mark has been applied, in a second processing line as a downstream processing line of the first processing line;After cutting, apply a second position specification mark to the metal strip in the same longitudinal position as the longitudinal position of the first position specification mark on the second processing line; and, before applying the second position specification mark, detect at least one of the plurality of reference marks and calibrate tracking information to apply the second position specification mark based on position information of the reference mark detected on the second processing line. The processing of metal strip 10 is the manufacturing process of metal strip 10, for example. The processing is the processing of metal strip 10 to manufacture a cold-rolled steel sheet. According to this configuration, the position tracking deviation for applying the second position specification mark is calibrated by reference marks S configured in the longitudinal direction according to a specific rule on the second processing line. As a result, this mode makes it possible to perform printing in the same longitudinal position on different processing lines. More specifically, with this configuration, the tracking deviation can be suppressed to a low degree. This makes it possible to automate print processing that was previously done manually by reprinting in the same position. (2) This modality is a method for processing a metal strip by sequentially applying processing to the same metal strip in a plurality of processing lines, which includes: applying a first position specification mark to the metal strip in a first processing line selected from the plurality of processing lines; applying a plurality of reference marks configured with a predetermined regularity along the longitudinal direction to the metal strip in the first processing line or in an upstream processing line of the first processing line; cutting a portion of the metal strip, to which the first position specification mark has been applied, in a second processing line as a downstream processing line of the first processing line;and, after cutting, apply a second position specification mark to the metal strip in the same longitudinal position as the longitudinal position of the first position specification mark in the second processing line, wherein the longitudinal position of the first position specification mark is associated with a reference mark selected from the plurality of reference marks, and, in the second processing line, the longitudinal position of the first position specification mark is specified based on the position information of the selected reference mark, and the application position of the second position specification mark is determined. According to this configuration, the tracking deviation is compensated for by reference marks S configured in the longitudinal direction according to a specific rule. As a result, printing in the same longitudinal position on different processing lines is enabled. More specifically, with this configuration, the tracking deviation can be suppressed to a low degree. This makes it possible to automate the printing process that was previously performed manually by reprinting in the same position. (3) In this mode, after the cutting (trimming) processing of a part of the metal strip 10, to which the first position specification mark has been applied, the second position specification mark (reprint mark) is applied to a part of an end part in the zfrapnn / rznz / e / YiAi width direction of the metal strip 10 that has not been removed in the cutting processing on the second processing line. In this case, the cutting process of the metal strip part 10, to which the first position specification mark has been applied, is carried out before applying the second position specification mark. According to this configuration, the second position specification mark can be applied to the end part of the metal strip 10 with high position accuracy. A method of performing reprinting before trimming offers no advantages. This is because the printout on the first processing line and the reprint contain the same information, and therefore reprinting is unnecessary. (4) In this modality, the identification information to identify each reference mark S applies to the plurality of reference marks S. According to this configuration, each reference mark S can be individually identified. (5) In this mode, the longitudinal position of the first position specification mark is specified from the separation distance in the longitudinal direction of the metal strip 10 from the selected reference mark S. According to this configuration, the longitudinal position of the first position specification mark can be associated with the selected reference mark S. (6) In this modality, the cutting processing of the part of the metal strip 10, to which the plurality of reference marks S has been applied, is carried out on the second processing line. For example, the cutting process of the metal strip part 10, to which the plurality of reference marks S has been applied, is carried out before applying the second position specification mark. According to this configuration, the reference mark S can be removed. (7) In this modality, the first position specification mark and the second position specification mark are K defect marks that indicate the longitudinal position of a defect present in the metal strip 10. According to this configuration, the K defect mark can be reprinted with high accuracy. (8) This modality is a method of applying a mark to a metal strip by applying sequential processing to the same metal strip on a plurality of processing lines, including: applying a first position specification mark specifying the position to the metal strip on a first processing line selected from the plurality of processing lines; applying a plurality of reference marks configured with a predetermined regularity along the longitudinal direction to the metal strip on the first processing line or on an upstream processing line of the first processing line; applying a second position specification mark at the same longitudinal position as the longitudinal position of the first position specification mark on a second processing line as a downstream processing line of the first processing line;and, when applying the second position specification mark, zfrapnn / rznz / e / YiAi determine a position in which the second position specification mark is applied by specifying the longitudinal position of the first position specification mark based on the position of a reference mark selected from the plurality of reference marks.; According to this configuration, the tracking deviation is compensated for by reference marks S configured in the longitudinal direction according to a specific rule. As a result, printing in the same longitudinal position on different processing lines is enabled. More specifically, with this configuration, the tracking deviation can be suppressed to a low degree. This makes it possible to automate the printing process that was previously performed manually by reprinting in the same position. (9) This embodiment is a mark application device for applying, on a second processing line selected from a plurality of processing lines applying sequential processing to the same metal strip on the plurality of processing lines, a second position specification mark at the same longitudinal position on the metal strip as the position of a first position specification mark that has been applied on a first upstream processing line of the second processing line, including: a printing device for reference marks configured on the first processing line or on an upstream processing line of the first processing line and printing a reference mark onto the metal strip;A reference mark printing processing unit that carries out the printing processing of a plurality of reference marks configured with a predetermined regularity along the longitudinal direction of the metal strip by means of the reference mark printing device; an associated information acquisition unit that obtains associated information in which the selected reference mark from the plurality of reference marks is associated with the first position specification mark; a mark detection unit provided in the second processing line and detects the reference mark; a reprinting device configured in the second processing line and applies the second position specification mark to the metal strip;and that carries out the processing of a reprinting processing unit that specifies the longitudinal position of the metal strip of the first position specification mark of the associated information obtained by the associated information acquisition unit and position information of the reference mark detected by the mark detection unit, and the printing of the second position specification mark by means of the reprinting device based on the specified longitudinal position.; According to this configuration, the position tracking deviation is compensated for and calibrated by reference marks S configured in the longitudinal direction according to a specific rule. As a result, printing in the same longitudinal position on different processing lines is enabled. More specifically, with this configuration, the tracking deviation can be suppressed to a low degree. This makes it possible to automate the printing process that was previously performed manually by reprinting in the same position. (10) The plurality of reference marks S may be applied with identification information to identify each reference mark S. zfrQpnn / rznz / B / YiAi According to this configuration, the identification of each reference mark S is facilitated. (11) In this modality, the associated information includes information on the separation distance in the longitudinal direction of the metal strip 10 between the longitudinal position of the first position specification mark and the longitudinal position of the reference mark S selected from the plurality of reference marks S. According to this configuration, the longitudinal position of the first position specification mark can be associated with the selected reference mark S. The full contents of JP 2020-164011 A (filed September 29, 2020), for which this application claims priority, are incorporated herein by reference. The description herein is given with reference to a limited number of embodiments, but the scope of the invention is not limited to these, and modifications to each embodiment based on the foregoing description are obvious to those skilled in the art. List of Reference Signs 1 unwind reel tension reel 2, PLG plating processing unit defect inspection device printing device 6A printing device for defect marking 6B printing device for reference marks first line control unit 7A first position tracking unit 7B defect mark printing processing unit 7C reference mark print processing unit database top computer 9A associated information acquisition unit metal strip print performance data print performance data group unwind reel tension reel 21, PLG printed brand recognition device, cutting device, reprinting device, second line control unit 26A second position tracking unit 26B reprint processing unit K defect mark S reference mark
Claims
1. A method for processing a metal strip by sequentially applying processing to the same metal strip in a plurality of processing lines, characterized in that it comprises: applying a first position specification mark to the metal strip in a first processing line selected from the plurality of processing lines; applying a plurality of reference marks configured with a predetermined regularity along a longitudinal direction to the metal strip in the first processing line or in an upstream processing line of the first processing line; cutting a portion of the metal strip, to which the first position specification mark has been applied, in a second processing line as a downstream processing line of the first processing line;After cutting, apply a second position specification mark to the metal strip at the same longitudinal position as the first position specification mark on the second processing line; and before applying the second position specification mark, detect at least one of the plurality of reference marks and calibrate the tracking information to apply the second position specification mark based on the position information of the reference mark detected on the second processing line.
2. The method for processing a metal strip by sequentially applying processing to the same metal strip in a plurality of processing lines, further characterized in that it comprises: applying a first position specification mark to the metal strip in a first processing line selected from the plurality of processing lines; applying a plurality of reference marks configured with a predetermined regularity along a longitudinal direction to the metal strip in the first processing line or in an upstream processing line of the first processing line; cutting a portion of the metal strip, to which the first position specification mark has been applied, in a second processing line as a downstream processing line of the first processing line;and after cutting, applying a second position specification mark to the metal strip in the same longitudinal position as a longitudinal position of the first position specification mark in the second processing line, wherein the longitudinal position of the first position specification mark is associated with a reference mark selected from the plurality of reference marks, and in the second processing line, the longitudinal position of the first position specification mark is specified based on the position information of the selected reference mark, and an application position of the second position specification mark is determined.
3. The method for processing a metal strip according to claim 1 or 2, further characterized in that it comprises applying the identification information to identify each reference mark to the plurality of reference marks.
4. The method for processing a metal strip according to claim 2 or 3, further characterized in that it comprises specifying the longitudinal position of the first position specification mark from a separation distance in a longitudinal direction of the metal strip from the selected reference mark.
5. The method for processing a metal strip according to any of claims 1 to 4, further characterized in that it comprises performing the cutting process of a portion of the metal strip, to which the plurality of reference marks has been applied, on the second processing line.
6. The method for processing a metal strip according to claim 5, further characterized in that the cutting process of the portion of the metal strip to which the plurality of reference marks has been applied is carried out before applying the second position specification mark.
7. The method for processing a metal strip in accordance with any of claims 1 to 6, further characterized in that the first position specification mark and the second position specification mark are defect marks indicating a longitudinal position of a defect present in the metal strip.
8. A method for manufacturing a metal strip characterized in that it comprises: the method for processing a metal strip in accordance with any of claims 1 to 7.
9. The method for manufacturing a metal strip according to claim 8, further characterized in that a cold-rolled steel sheet is manufactured.
10. A mark application method for applying a mark to a metal strip by sequentially processing the same metal strip in a plurality of processing lines, the mark application method being characterized in that it comprises: applying a first position specification mark that specifies a position to the metal strip in a first processing line selected from the plurality of processing lines; applying a plurality of reference marks configured with a predetermined regularity along a longitudinal direction to the metal strip in the first processing line or in an upstream processing line of the first processing line;applying a second position specification mark at the same longitudinal position as a longitudinal position of the first position specification mark in a second processing line as a downstream processing line of the first processing line; and in applying the second position specification mark, determining a position at which the second position specification mark is applied by specifying the longitudinal position of the first position specification mark based on a position of a reference mark selected from the plurality of reference marks. zfrQpnn / rznz / e / γΐΛΐ; 11. A mark printing device for applying, in a second processing line selected from a plurality of processing lines applying sequential processing to the same metal strip in the plurality of processing lines, a second position specification mark at the same longitudinal position of the metal strip as a longitudinal position of a first position specification mark that has been applied in a first upstream processing line of the second processing line, the mark printing device characterized in that it comprises: a printing device for reference marks configured in the first processing line or in an upstream processing line of the first processing line and configured to print a reference mark to the metal strip;A reference mark printing processing unit configured to perform the printing processing of a plurality of reference marks configured with a predetermined regularity along the longitudinal direction of the metal strip by means of the reference mark printing device; an associated information acquisition unit configured to obtain associated information in which the selected reference mark from the plurality of reference marks is associated with the first position specification mark; a mark detection unit provided in the second processing line and configured to detect the reference mark; a reprinting device configured in the second processing line and configured to apply the second position specification mark to the metal strip;and a reprinting processing unit configured to perform the processing of specifying the longitudinal position of the metal strip of the first position specification mark from the associated information obtained by the associated information acquisition unit and position information of the reference mark detected by the mark detection unit, and printing the second position specification mark by means of the reprinting device based on the specified longitudinal position.
12. The mark printing device according to claim 11, further characterized in that the plurality of reference marks is applied with identification information to identify each reference mark.
13. The marking printing device according to claim 11 or 12, further characterized in that the associated information includes information of a separation distance in a longitudinal direction of the metal strip between a longitudinal position of the first position specification mark and a longitudinal position of the reference mark selected from the plurality of reference marks.
14. The marking printing device according to any of claims 11 to 13, further characterized in that the first position specification mark and the second position specification mark are defect marks indicating a longitudinal position of a defect present in the metal strip.