Measurement jig, measurement device, measurement method, plate-shaped product manufacturing facility, plate-shaped product quality management method, and

Abstract

This measurement jig is provided with: a contact member (113) that comes into contact with a side surface (302) of a plate-shaped measurement object (300) when a surface (301) near the edge of the measurement object (300) is measured by a physical quantity measurement unit (2) that measures the physical quantity of the measurement object (300); and holding members (111, 112) that hold the contact member (113) such that the distance between the physical quantity measurement unit (2) and the edge in the direction orthogonal to the scanning direction in which the physical quantity measurement unit (2) is scanned is maintained constant.

Description

Technical Field

[0001] The present invention relates to a measuring jig, a measuring device, a measuring method, a manufacturing device for a plate-shaped product, a quality management method for a plate-shaped product, and a manufacturing method for a plate-shaped product. Background Art

[0002] In the past, steel plates used for pipelines, shipbuilding, pressure vessels, construction machinery, etc. were manufactured by continuous casting or ingot casting and then decomposing, rolling, and forging as needed, and then hot rolling, heat treatment, and cutting (shearing machine, gas cutting). Then, the manufactured steel plates were shipped after undergoing appearance and dimensional inspection, ultrasonic flaw detection test, surface hardness inspection, and inspection of mechanical properties based on sampling. Here, as one of the defects of steel plates that become problems in the final product, there are defects generated inside the steel plate, and defects called hard spots where the surface of the steel plate becomes locally hard or soft where it becomes locally soft. As a method for measuring these defects, there is a method of measuring using a trolley equipped with a measuring instrument. For example, Non-Patent Document 1 describes a method of measuring by installing a sensor on a trolley that can be remotely operated, and Non-Patent Document 2 describes a method of measuring by installing a sensor on a hand-pushed trolley.

[0003] Non-patent document 1: Bernd Wolter, Yasmine Gabi and Christian Conrad, "Nondestructive Testing with 3MA-An Overview ofPrinciples and Application", Appl.Sci.2019,9,1068

[0004] Non-patent document 2: Gerald Schneibel, Christoph Konig, Aschwin Gopalan, Jean-Marc Dussaulx, "Development of an Eddy Current based Inspection Technique for the Detection of Hard Spots on Heavy Plates", 19th World Conference on Non-Destructive Testing 2016

[0005] In the existing defect measurement method, for example, a measuring instrument mounted on a trolley is brought into contact with the surface of a steel plate to measure defects. Specifically, the measuring instrument is set in such a manner that the measuring instrument itself is pressed against the steel plate, or the gap between the surface of the measuring instrument and the surface of the steel plate is maintained constant. In particular, in the case of measurements such as eddy current testing and electromagnetic measurement where the gap (also called lift-off) between the measuring instrument and the steel plate to be measured is very important, the measuring instrument is set as described above. In addition, in the case of measurement using ultrasonic waves, the measuring instrument is set in the same manner as in the case of measurement based on eddy current testing and electromagnetic measurement. Moreover, when measuring the entire surface of a steel plate, a method is often used in which a marking line is drawn on the surface of the steel plate using chalk or the like, and the trolley is moved along the line. In addition, since the manually operated trolley has some twists and turns, in order to measure the entire surface of the plate without omission, it is necessary to draw in such a manner that the measurement range overlaps when each marking line moves.

[0006] Even when measuring near the edge, measurement is performed along the marking line as described above. However, if the marking line is drawn to minimize the non-measurable area at the edge, there is a risk of measurement anomalies due to protrusion of sensors, cart wheels, etc. from the plate. Since it is difficult to create an overlap near the edge, as is done in the center of the plate, the cart's deflection directly becomes the non-measurable area, resulting in a large non-measurable area near the edge.

[0007] In addition, as a problem in measurements near the edge, there is the influence of the edge dead zone. The edge dead zone is a range that cannot be performed correctly due to the influence from the edge. In the case of electromagnetic measurement, due to the phenomenon called edge effect in which the electromagnetic field is concentrated at the end of the measurement object, there is a problem that the end cannot be measured and evaluated correctly. As a method for reducing the dead zone, a method of changing the standard curve of the inspection, the measurement conditions, the method of setting the correction value, etc. are considered in the center and near the edge of the steel plate. However, when the trolley is moved on the surface of the steel plate to measure near the edge, if the trolley is bent and the distance between the edge and the sensor cannot be maintained constant in the direction orthogonal to the moving direction of the trolley, the measurement accuracy of the physical quantity of the surface near the edge of the steel plate decreases. Summary of the Invention

[0008] The present invention was developed in response to the above-mentioned problems and aims to provide a measuring fixture, a measuring device, and a measuring method that can improve the measurement accuracy of physical quantities on the surface of a measured object near its edge. The present invention also provides manufacturing equipment for plate-like products, a quality management method for plate-like products, and a manufacturing method for plate-like products.

[0009] In order to solve the above problems and achieve the purpose,

[0010] [1] The measuring fixture according to the present invention comprises: a contact member that contacts the side surface of the measuring object when measuring the surface near the edge of the measuring object using a physical quantity measuring unit that measures the physical quantity of the plate-shaped measuring object; and a holding member that holds the contact member in such a manner that the distance between the edge and the physical quantity measuring unit in a direction perpendicular to a scanning direction in which the physical quantity measuring unit scans is maintained constant.

[0011] [2] In addition, the measuring fixture involved in the present invention is completed on the basis of the invention of the above-mentioned [1], wherein the above-mentioned contact part is a disc-shaped rotating body having an outer peripheral surface in contact with the above-mentioned side surface, and is rotatably arranged on the above-mentioned holding part via the rotating axis of the rotating body.

[0012] [3] In addition, the measuring jig according to the present invention is completed based on the invention of [1] or [2] above, and a magnet is provided on the contact member.

[0013] [4] The measuring device according to the present invention comprises: a physical quantity measuring unit for measuring a physical quantity of a measurement object; and the measuring jig according to any one of the inventions [1] to [3] above.

[0014] [5] The measuring device involved in the present invention is completed on the basis of the invention of [4] above, and comprises: a correction unit that uses a correction formula representing the relationship between the distance of the above-mentioned measured object from the above-mentioned edge and the above-mentioned physical quantity and the distance from the above-mentioned edge to the above-mentioned physical quantity measuring unit when measured by the above-mentioned physical quantity measuring unit to correct the above-mentioned physical quantity measured by the above-mentioned physical quantity measuring unit.

[0015] [6] The measuring method according to the present invention comprises: a physical quantity measuring step of measuring a physical quantity of a measurement object using the measuring fixture of any one of the inventions [1] to [3] above.

[0016] [7] The measuring method involved in the present invention is completed on the basis of the measuring method of the invention of the above-mentioned [6], and comprises: a correction step, using a correction formula of the relationship between the distance of the above-mentioned measured object from the above-mentioned edge and the above-mentioned physical quantity and the distance from the above-mentioned edge to the above-mentioned physical quantity measuring part during the above-mentioned physical quantity measuring step to correct the above-mentioned physical quantity measured in the above-mentioned physical quantity measuring step.

[0017] [8] The manufacturing equipment of the plate-like product involved in the present invention comprises: a manufacturing device for manufacturing the plate-like product; and a measuring device of the invention of the above-mentioned [4] or [5] for measuring the physical quantity of the above-mentioned plate-like product manufactured by the above-mentioned manufacturing device.

[0018] [9] The quality management method for plate-like products involved in the present invention includes: a physical quantity measurement step, which measures the physical quantity of the plate-like product by the measurement method of the invention [6] or [7] above; and a quality management step, which performs quality management of the plate-like product based on the measurement results of the physical quantity obtained by the physical quantity measurement step.

[0019]

[10] The method for manufacturing a plate-like product according to the present invention comprises: a manufacturing step of manufacturing a plate-like product; and a physical quantity measuring step of measuring the physical quantity of the plate-like product manufactured in the manufacturing step by the measuring method of the invention of [6] or [7].

[0020] The measuring jig, measuring device, measuring method, plate-like product manufacturing equipment, plate-like product quality management method, and plate-like product manufacturing method according to the present invention can maintain a constant distance between the edge of the object being measured and the physical quantity measuring unit during measurements near the edge. Consequently, the measuring jig, measuring device, measuring method, plate-like product manufacturing equipment, plate-like product quality management method, and plate-like product manufacturing method according to the present invention can reduce the non-measurement range or dead zone and improve measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a side view showing a schematic configuration of the measuring device according to the first embodiment.

[0022] Figure 2 This is a diagram of the measurement device according to Embodiment 1 as viewed from the rear side in the scanning direction.

[0023] Figure 3 This is a block diagram showing the configuration of the measuring device according to the first embodiment.

[0024] Figure 4 (a) is a plan view showing a configuration example of the physical quantity measuring unit. Figure 4 (b) is a side view showing a configuration example of the physical quantity measuring unit.

[0025] Figure 5 This is a side view of the sensor of the physical quantity measuring unit.

[0026] Figure 6 This is a top view of the sensor of the physical quantity measuring unit.

[0027] Figure 7 This is a diagram showing a first example of the waveform of the AC signal (AC voltage) applied to the exciting coil.

[0028] Figure 8 This is a diagram showing a second example of the waveform of the AC signal (AC voltage) applied to the exciting coil.

[0029] Figure 9 (a) is a diagram showing a map of physical quantities when the physical quantities of the surface of the area near the edge of the steel plate are measured without using the edge following unit. Figure 9 (b) is a diagram showing a map of physical quantities when the physical quantities of the surface of the area near the edge of the steel plate are measured using the edge following unit.

[0030] Figure 10 is a flowchart showing an example of a process of creating edge influence data.

[0031] Figure 11 This is a diagram showing the relationship between the amount of change in the first electromagnetic characteristic value and the edge distance based on edge effect data measured using five steel plates A to E.

[0032] Figure 12 1 is a flowchart showing an example of control of edge effect correction of electromagnetic feature amounts by the control unit.

[0033] Figure 13 Graphs showing the relationship between the first electromagnetic feature quantity and the edge distance before and after correction of edge effects. DETAILED DESCRIPTION

[0034] (Implementation Method 1)

[0035] Hereinafter, a measuring jig and a measuring device according to a first embodiment of the present invention will be described. However, the present invention is not limited to this embodiment.

[0036] Figure 1 This is a side view showing a schematic configuration of the measuring device 1 according to the first embodiment. Figure 2 This is a diagram of the measurement device 1 according to the first embodiment as viewed from the rear side in the scanning direction. Figure 3 This is a block diagram showing the configuration of the measurement device 1 according to the first embodiment.

[0037] The measuring device 1 according to the first embodiment can be moved by an operator to measure the mechanical properties of the surface layer of the steel plate 300. In the case of this embodiment, the hardness of the surface layer of the steel plate 300 is calculated based on the electromagnetic characteristic quantity of the surface layer of the steel plate 300. Therefore, the object to be measured is the steel plate 300, and the physical quantity to be measured is the electromagnetic characteristic quantity of the surface layer. As the steel plate 300, a steel material with thickness that is used as a steel pipe such as a pipeline can be exemplified. Figures 1 to 3 As shown, the measuring device 1 according to the first embodiment includes a physical quantity measuring unit 2 , a control unit 3 , an operating unit 4 , a display unit 5 , a storage unit 6 , a sensor attachment state monitoring unit 7 , a guide unit 8 , a moving unit 9 , a connecting unit 10 , and an edge tracking unit 11 .

[0038] The physical quantity measuring unit 2 includes an ultrasonic sensor, an eddy current flaw detection sensor, or a sensor for electromagnetic measurement. Figure 4 1 and 2 are top and side views showing an example of the configuration of the physical quantity measuring unit 2. In this embodiment, Figure 4 (a) and Figure 4 As shown in (b), the physical quantity measuring unit 2 includes a plurality of (in this example, 8 sensors, Ch. 1 to Ch. 8) 20a to 20h. In addition, in the following description, when the sensors 20a to 20h are not specifically distinguished, they are simply referred to as sensors 20. Although the physical quantity measuring unit 2 can also include only one sensor 20, it is preferred to include a plurality of sensors 20 because it can expand the range of the steel plate 300 that can be scanned at one time to improve the measurement efficiency. In addition, each sensor 20 is configured to be pressed against the surface 301 of the steel plate 300 by pressing the physical quantity measuring unit 2 downward via the connecting portion 10 or the like.

[0039] Return to Figure 3 The control unit 3 includes a processing unit such as a microcomputer, measures the surface 301 of the steel plate 300 using the physical quantity measuring unit 2, and outputs the measurement results to the display unit 5. The control unit 3, the operating unit 4, and the display unit 5 may be partially or entirely integrated using an information processing device such as a tablet computer or a PC.

[0040] The operation unit 4 includes an input device such as a keyboard, a mouse pointer, or a touchpad. The operation unit 4 is operated to input the required operation amount or content when operating the physical quantity measuring unit 2 or the control unit 3, and outputs an operation input signal to the control unit 3. The operation unit 4 may be a device such as a toggle switch (dial switch) that can set the required operation amount.

[0041] The display unit 5 is composed of a display device such as a liquid crystal display, and displays information related to the measurement results of the steel plate 300 output from the control unit 3, and operation information of the physical quantity measuring unit 2 or the control unit 3. In this embodiment, the display unit 5 displays the measurement results on the map of the steel plate 300. Specifically, the display unit 5 displays the position on the steel plate 300 where the mechanical properties are preset values ​​on the map of the steel plate 300. The display unit 5 can also display the scanning speed and movement amount of the trolley during measurement. In addition, the display unit 5 can also display the monitoring results of the attachment status of the sensor 20 output from the sensor attachment status monitoring unit 7. In addition, the display unit 5 can also notify the measurement results by sound.

[0042] To accurately measure the physical quantity of the steel plate 300 using the physical quantity measuring unit 2, the sensor 20 of the physical quantity measuring unit 2 is preferably pressed against the steel plate 300 so as to contact the surface 301 of the steel plate 300. Alternatively, to accurately measure the physical quantity of the steel plate 300 using the physical quantity measuring unit 2, the distance between the surface 301 of the steel plate 300 and the sensor 20 of the physical quantity measuring unit 2 is preferably maintained constant. However, due to the undulations of the surface 301 of the steel plate 300, the physical quantity measuring unit 2 cannot accurately follow the surface 301 of the steel plate 300. As a result, the pressure of the physical quantity measuring unit 2 is weakened, causing the physical quantity measuring unit 2 to move away from the steel plate 300, or the distance between the surface 301 of the steel plate 300 and the physical quantity measuring unit 2 is not maintained constant. These situations may result in areas where accurate measurement cannot be performed. In such cases, it is preferable to include a sensor attachment status monitoring unit 7, described below.

[0043] The sensor attachment condition monitoring unit 7 is a device that monitors whether the sensor 20 of the physical quantity measuring unit 2 is accurately attached to the surface 301 of the steel plate 300 and / or whether the distance between the surface 301 of the steel plate 300 and the sensor surface is maintained constant. Figure 4 (a) and Figure 4 As shown in (b) of FIG. 2 , the sensor adhesion condition monitoring unit 7 measures the distance between the sensor 20 and the steel plate 300 using laser rangefinders 7a to 7d installed on a straight line passing through the longitudinal center of the sensor 20 constituting the physical quantity measuring unit 2. Thus, the sensor adhesion condition monitoring unit 7 monitors the adhesion condition of the sensor 20. Furthermore, the sensor adhesion condition monitoring unit 7 is not limited to laser rangefinders; an eddy current rangefinder or a contact-type touch sensor may also be used to monitor the adhesion condition of the sensor 20.

[0044] Return to Figure 3 . The guide portion 8 is a device that guides the physical quantity measuring portion 2 during scanning relative to the marking line drawn on the surface 301 of the steel plate 300. Specifically, the guide portion 8 projects three linear lasers parallel to the marking line relative to one marking line to guide the physical quantity measuring portion 2. In the present embodiment, the interval between the three linear lasers is configured with the width of PL. In addition, the guide portion 8 is not limited to a mechanism that projects three linear lasers relative to the marking line. For example, the guide portion 8 can be configured with three guide components relative to the marking line, or the image of the marking line can be captured by the shooting portion, and the image obtained by superimposing the images of the three guide lines on the captured image of the marking line is displayed on the display portion 5.

[0045] The moving unit 9 includes, for example, a trolley. More specifically, it includes a trolley 91 and a handle 92 for the operator to control the movement of the trolley 91 (for example, the amount of movement, the speed of movement, and the direction of movement). The trolley 91 enables the moving unit 9 to carry the physical quantity measuring unit 2, the control unit 3, the operating unit 4, the display unit 5, the storage unit 6, the sensor attachment status monitoring unit 7, the guide unit 8, the connecting unit 10, and the edge tracking unit 11 to move. The moving unit 9 causes the physical quantity measuring unit 2 to scan the surface 301 of the steel plate 300. The trolley 91 is equipped with four wheels 93a to 93d. The operator uses the moving unit 9 to cause the physical quantity measuring unit 2 to scan the surface 301 of the steel plate 300, thereby measuring the steel plate 300. At this time, since the carriage 91 has wheels 93a to 93d, the operator can control the movement amount, movement speed, and movement direction of the physical quantity measuring unit 2 by pressing the handle 92 while causing the physical quantity measuring unit 2 to scan. Figure 1 (a) and Figure 1 As shown in (b), when the moving unit 9 includes four wheels 93a to 93d, it is preferable that each wheel be arranged facing inward relative to the scanning direction in order to improve straightness during scanning. In addition, the moving unit 9 is not limited to a structure in which the operator manually presses it to move, and for example, a structure in which it moves automatically may also be used.

[0046] The connection unit 10 is a mechanism that connects the physical quantity measurement unit 2 to the control unit 3 mounted on the carriage 91. The connection unit 10 includes an arm 101 and a cylinder 102. The arm 101 positions the physical quantity measurement unit 2 in front of the carriage 91 in the scanning direction. The cylinder 102 holds the physical quantity measurement unit 2 so that the sensor 20 of the physical quantity measurement unit 2 can be accurately attached to the surface 301 of the steel plate 300 and / or the gap between the surface 301 of the steel plate 300 and the sensor surface is maintained constant. The connection unit 10 holds the physical quantity measurement unit 2 in a position that does not hinder the movement of the carriage 91. At the same time, the connection unit 10 can hold the physical quantity measurement unit 2 so that the sensor 20 of the physical quantity measurement unit 2 can be accurately attached to the surface 301 of the steel plate 300 and / or the gap between the surface 301 of the steel plate 300 and the sensor surface is maintained constant. Furthermore, the connection unit 10 may also have a function of electrically connecting to the control unit 3 so as to transmit the output of the sensor 20 of the physical quantity measurement unit 2 to the control unit 3. Furthermore, the connection portion 10 may have a function of electrically connecting the guide portion 8 and the control portion 3 so that the position of the linear laser beam of the guide portion 8 can be adjusted and controlled by the control portion 3 and the operation portion 4 .

[0047] In order to ensure that the sensor 20 of the physical quantity measuring unit 2 is accurately attached to the surface 301 of the steel plate 300 and / or the interval between the surface 301 of the steel plate 300 and the sensor surface is maintained constant, the connecting unit 10 may also have a driving unit (not shown). The driving unit is connected to the control unit 3 and the end of the arm 101 that is not connected to the physical quantity measuring unit 2. The arm 101 is moved up and down and / or the cylinder 102 is extended or contracted in the up and down directions by the driving unit, thereby enabling the sensor 20 of the physical quantity measuring unit 2 to be placed in an accurate position. The control of the driving unit is preferably performed by the control unit 3. The control unit 3 sets the driving amount based on the input from the operating unit 4 and / or the output of the sensor attachment status monitoring unit 7, and causes the driving unit to operate based on the driving amount.

[0048] The edge following portion 11 is a measuring jig for constraining the moving portion 9 relative to the steel plate 300 to maintain a constant distance between the sensor 20 of the physical quantity measuring portion 2 and the edge 303 of the steel plate 300. The edge following portion 11 has an arm 111, a lifting component 112, a contact component 113, a lifting fixing portion 114, and a rotating shaft component 115. The arm 111 is a supporting component that is elongated in the width direction perpendicular to the scanning direction (moving direction) of the moving portion 9. One end of the arm 111 is fixed to the side surface of the trolley 91 in the above-mentioned width direction. At the other end of the arm 111, an L-shaped lifting component 112 that is elongated in the vertical direction is provided so as to be movable in the vertical direction relative to the arm 111. The lifting fixing portion 114 is configured to be able to fix the lifting component 112 at any position in the vertical direction relative to the arm 111. A rotating shaft member 115 is provided at the lower end of the lifting member 112, extending vertically along an axis. The contact member 113 is rotatably mounted on the rotating shaft member 115. The contact member 113 is a disc-shaped rotating body having an outer peripheral surface that contacts the side surface 302 of the steel plate 300. This allows the movable portion 9 to smoothly move along the surface 301 of the steel plate 300 as the contact member 113 rotates and moves along the side surface 302 of the steel plate 300. Furthermore, if the steel plate 300 is magnetic, for example, a magnet is preferably provided on the contact member 113. This allows the contact member 113 to be prevented from moving away from the side surface 302 of the steel plate 300 by utilizing the magnetic attraction generated by the magnet provided on the contact member 113. The magnet provided on the contact member 113 can be either a permanent magnet or an electromagnet. In this case, it is preferable to select a magnet with a magnetic force that does not significantly affect eddy current testing. The magnetic field is primarily concentrated near the edge, and the apparent range of influence is narrowed, thus minimizing the impact on eddy current testing. In addition, in order to reduce the size, a permanent magnet is more preferable. In addition, in this embodiment, the arm 111 and the lifting member 112 constitute a holding member that holds the contact member 113 so as to maintain a constant distance between the edge 303 of the steel plate 300 and the sensor 20 in a direction perpendicular to the scanning direction in which the sensor 20 (physical quantity measuring unit 2) is scanned.

[0049] When measuring a physical quantity near the edge 303 of the steel plate 300 using the measuring device 1 according to the first embodiment, the lifting member 112 is moved vertically relative to the arm 111, thereby adjusting the height so that the outer peripheral surface of the contact member 113 contacts the side surface 302 of the steel plate 300. Furthermore, the term "near the edge" refers to, for example, a range from the end (edge) to 120 mm in the width direction of the steel plate. In practice, the range within which the physical quantity measured by the physical quantity measuring unit 2 varies relative to the center portion in the width direction of the steel plate can be defined as near the edge. Furthermore, in the measuring device 1 according to the first embodiment, the movable unit 9 is moved in the scanning direction while the outer peripheral surface of the contact member 113 contacts the side surface 302 of the steel plate 300 to follow the edge 303. This allows the movable unit 9 to be moved while maintaining a constant distance between the movable unit 9 and the edge 303 of the steel plate 300, and consequently, the distance between the sensor 20 of the physical quantity measuring unit 2 and the edge 303 of the steel plate 300. Thus, in the measuring device 1 involved in embodiment 1, the distance between the sensor 20 and the edge 303 can be maintained constant along the edge 303 (side 302) of the steel plate 300, and the physical quantity measuring unit 2 can be used to measure the physical quantity of the surface 301 in the area near the edge of the steel plate 300.

[0050] In addition, when measuring physical quantities other than those near the edge 303 of the steel plate 300 by the physical quantity measuring unit 2, when the surface 301 of the steel plate 300 interferes with the contact component 113, the contact component 113 is retracted above the steel plate 300 by moving the lifting component 112 upward.

[0051] In addition, depending on the steel plate 300 to be measured, there is a case where the range to be measured on the surface 301 of the steel plate 300, that is, the distance between the edge 303 and the sensor 20 (physical quantity measuring part 2) changes in the width direction of the steel plate. Therefore, the edge following part 11 can also be constructed so that the lifting component 112 can be moved relative to the arm 111 in the arm length direction (steel plate width direction) through a sliding mechanism. In addition, in this case, for example, as the lifting fixing part 114, it is sufficient to be constructed so that the lifting component 112 can be fixed at any position in the arm length direction relative to the arm 111. Moreover, by sliding the lifting component 112 relative to the arm 111 in the arm length direction, the distance between the trolley 91 and the contact component 113 in the arm length direction is changed, thereby adjusting the distance between the edge 303 and the sensor 20 (physical quantity measuring part 2) in the steel plate width direction.

[0052] Furthermore, when measuring the entire surface of the steel plate 300 using the measuring device 1 according to the first embodiment, after reaching the end in the scanning direction (travel direction) on the surface 301 of the steel plate 300, it is usually necessary to reverse the direction of the scanning direction (movement direction) to allow the movable portion 9 to travel. Therefore, it is desirable that the edge following portions 11 are provided on the left and right sides of the scanning direction (travel direction) of the movable portion 9. Furthermore, in a structure in which the contact member 113 of only one edge following portion 11 is brought into contact with the side surface 302 of the steel plate 300, there is a concern that the movable portion 9 will rotate on the surface 301 of the steel plate 300 with the contact portion between the side surface 302 of the steel plate 300 and the contact member 113 of the edge following portion 113 being the center of rotation, causing the direction of the movable portion 9 to change. Therefore, it is desirable that at least two edge following portions 11 be provided in front and behind the movable portion 9 in the scanning direction (travel direction).

[0053] Figure 5 It is a side view of the sensor 20 of the physical quantity measuring unit 2 . Figure 6 FIG2 is a top view of the sensor 20 of the physical quantity measuring unit 2. The sensor 20 of the physical quantity measuring unit 2 is composed of an excitation coil 201 and a magnetizing yoke 202. Figure 5 In the example shown, the magnetized yoke 202 has two legs 202a and 202b, with an excitation coil 201 wound around the yoke portion 202c between the legs 202a and 202b. The excitation coil 201 of the sensor 20 is connected to the excitation unit 21 provided in the physical quantity measuring unit 2. When the excitation unit 21 applies an AC voltage (AC signal) to the excitation coil 201, exciting the excitation coil 201, a magnetic field is generated in the steel plate 300 via the magnetized yoke 202. Electromagnetic characteristics of the steel plate 300 can be obtained as changes in the output signal of the excitation coil 201. Electromagnetic characteristics include physical quantities directly or indirectly related to magnetization, differential permeability, eddy current signals (eddy current impedance), higher harmonic components, and coercive force. While this embodiment uses a single excitation coil 201, a detection coil may also be provided separately from the excitation coil 201. The detection coil is not limited to being wound around the magnetizing yoke 202 in the same manner as the excitation coil 201 , and may be wound around a magnetizing yoke different from the magnetizing yoke 202 around which the excitation coil 201 is wound, or may be used without being wound around the magnetizing yoke.

[0054] Here, in this embodiment, Figure 5 and Figure 6 As shown, when the legs 202a and 202b are arranged in the width direction of the steel plate, the distance between the center line L1 of the sensor 20 and the edge 303 of the steel plate 300 in the width direction of the steel plate is defined as the edge distance d.

[0055] In the measuring device 1 according to the first embodiment, the excitation unit 21 simultaneously excites the excitation coils 201 of the plurality of sensors 20a to 20h constituting the physical quantity measuring unit 2, thereby enabling simultaneous measurement of local electromagnetic characteristic quantities at a plurality of locations on the steel plate 300.

[0056] The excitation unit 21 applies an AC signal (AC voltage) to the excitation coil 201 of the sensor 20 close to the steel plate 300 to obtain a signal containing the electromagnetic characteristic quantity of the steel plate 300. In this embodiment, it is preferred to use such an excitation unit 21 and the sensor 20 to measure the electromagnetic characteristic quantity by eddy current testing or 3MA (Micromagnetic Multiparameter Microstructure and Stress Analysis) technology. For example, the excitation unit 21 applies an AC signal (AC voltage) to the excitation coil 201 of the sensor 20 close to the steel plate 300. Figure 7 The AC signal (AC voltage) with two frequencies superimposed is shown. Figure 8 The AC signal (AC voltage) of one frequency shown is applied twice to the exciting coil 201 to measure the electromagnetic characteristic quantity. Figure 5 The signal obtained by applying an AC signal (AC voltage) of one frequency shown is generally called an eddy current signal and is particularly suitable for flaw detection on the surface of the steel plate 300. In the eddy current flaw detection method, the eddy current on the surface 301 of the steel plate 300 excited by applying an AC signal (AC voltage) to the excitation coil 201 changes depending on the presence or absence of surface defects. The amplitude and phase of the eddy current signal are used to detect surface defects of the steel plate 300.

[0057] Alternatively, the excitation coil 201 may be applied only to the excitation coil 201. Figure 7 and Figure 8 The electromagnetic characteristic quantity can be measured by using any one of the two AC signals (AC voltage) shown in FIG. 1 , but the present invention is not limited thereto. Figure 7 and Figure 8 The two AC signals (AC voltages) shown are used to measure a large number of electromagnetic characteristics with different characteristics. Figure 7 and Figure 8 It is preferable to apply both of the two AC signals (AC voltages) shown and to divide the two AC signals (AC voltages) into two portions and apply them to the exciting coil 201 in order to correct edge effects and estimate mechanical characteristics.

[0058] In addition, the range of measuring the electromagnetic characteristic quantity on the surface 301 of the steel plate 300 changes depending on the size of the sensor 20 (excitation coil 201 and magnetizing yoke 202) and the frequency of the AC signal (AC voltage) applied to the excitation coil 201. When the AC signal (AC voltage) is applied, the magnetic field is concentrated on the surface of the steel plate 300 due to the skin effect, resulting in the measurement of the electromagnetic characteristic quantity of the surface. The range of measuring the electromagnetic characteristic quantity is averaged within the range of the magnetic field distribution. Therefore, when measuring the electromagnetic characteristic quantity locally, it is preferable to reduce the size of the sensor 20 (excitation coil 201 and magnetizing yoke 202) and select the frequency of the AC signal (AC voltage) applied to the excitation coil 201 in such a way that the skin depth corresponds to the depth range to be measured.

[0059] In the measuring device 1 according to the first embodiment, the moving unit 9 is moved along the scanning direction on the surface 301 of the steel plate 300 to move the physical quantity measuring unit 2 without moving the steel plate 300, and the physical quantity (electromagnetic characteristic quantity) of the entire surface of the steel plate 300 is measured by the physical quantity measuring unit 2. Alternatively, the physical quantity measuring unit 2 may be used to measure the physical quantity (electromagnetic characteristic quantity) of the entire surface of the steel plate 300 by moving the steel plate 300 without moving the physical quantity measuring unit 2.

[0060] Furthermore, the measuring device 1 according to the first embodiment may include, for example, a rotary encoder as a movement distance acquisition unit for acquiring the movement distance of the physical quantity measurement unit 2 on the surface 301 of the steel plate 300. Furthermore, the measuring device 1 according to the first embodiment may include, for example, an eddy current type or laser type edge position detection sensor as an edge position detection unit for detecting the edge position of the steel plate 300. Furthermore, by combining the rotary encoder and the edge position detection sensor, it is possible to derive the edge distance d when measuring the physical quantity (electromagnetic characteristic quantity) of the surface 301 near the edge of the steel plate 300.

[0061] Figure 9 (a) is a diagram showing a mapping of physical quantities when the physical quantities of the surface 301 of the area near the edge of the steel plate 300 are measured without using the edge tracking unit 11. In addition, here, a marking line is drawn on the surface 301 of the steel plate 300 so that the edge distance d becomes 10 [mm], and the electromagnetic characteristic quantity is measured along the marking line. Figure 9 As shown in (a), it can be confirmed that the difference in brightness near the edge of the steel plate 300 is large, and the measured value of the electromagnetic characteristic value fluctuates greatly. This is believed to be because the carriage 91 may fall from the steel plate 300 when the physical quantity of the surface 301 near the edge of the steel plate 300 is measured by the measuring device 1. As a result, the straightness of the carriage 91 decreases compared to the center portion in the width direction of the steel plate, and the edge distance d is not maintained constant and fluctuates greatly.

[0062] Figure 9 (b) is a diagram showing a mapping of physical quantities when the physical quantities of the surface 301 of the area near the edge of the steel plate 300 are measured using the edge following unit 11. In addition, here, the electromagnetic characteristic quantity is measured by adjusting the edge following unit 11 so that the edge distance d becomes 10 [mm]. Figure 9 As shown in (b), Figure 9 Compared with (a), it can be confirmed that the difference in brightness and darkness in the area near the edge of the steel plate 300 is smaller, and the fluctuation in the measured value of the electromagnetic characteristic value in the area near the edge is smaller. This is believed to be because the edge following unit 11 maintains the edge distance d constant.

[0063] As described above, in the measuring device 1 according to the first embodiment, the edge following unit 11 can be used to maintain the edge distance d constant, thereby improving the measurement accuracy of the physical quantity (electromagnetic characteristic quantity) of the surface 301 in the edge vicinity region of the steel plate 300 .

[0064] (Implementation Method 2)

[0065] Hereinafter, a measurement device and a measurement method according to a second embodiment of the present invention will be described. Note that the configuration of the measurement device according to the second embodiment is the same as that of the measurement device 1 according to the first embodiment, and therefore, the description thereof will be omitted as appropriate.

[0066] When electromagnetic measurements, such as eddy current measurements, are performed on the surface of a steel plate 300 using the physical quantity measuring unit 2 using the measuring device 1 according to Embodiment 2, the phenomenon known as the edge effect, in which the electromagnetic field is concentrated at the ends of the steel plate 300, can hinder accurate evaluation of measurement results. To address this issue, the present inventors conducted extensive research and investigated the relationship between multiple electromagnetic signatures and the edge distance d. As a result, the present inventors discovered that, while the pattern of change varies depending on the electromagnetic signature, a common trend of change occurs near the edge across multiple steel plates with different materials and mechanical properties, enabling correction for edge effects. Furthermore, the present inventors discovered that by using electromagnetic signatures whose changes due to edge effects are greater than those due to material and mechanical properties, it is possible to estimate the amount of variation in the edge distance d or other electromagnetic signatures due to edge effects. Consequently, the present inventors discovered that, for example, even when the shape of the steel plate end is complex and direct measurement of the edge distance d is impossible, correction for edge effects is possible.

[0067] In the measuring device 1 according to the second embodiment, the control unit 3 performs predetermined processing on the received signal obtained by the excitation unit 21 of the sensor 20 provided in the physical quantity measuring unit 2, thereby obtaining a plurality of electromagnetic characteristic quantities that vary according to the material of the steel plate 300. The storage unit 6 stores edge influence data and material data, and these data are read out when the control unit 3 performs edge influence correction and material prediction. In addition, the edge influence correction formula and material prediction formula pre-calculated by the control unit 3 based on the edge influence data and material data may be stored in the storage unit 6. The control unit 3 corrects the electromagnetic characteristic quantities that have varied due to the edge influence by using the edge influence data stored in the storage unit 6. The edge influence data is data obtained by measuring the electromagnetic characteristic quantities while varying the edge distance d for a plurality of steel plates 300 having different materials in advance, and is measurement data that represents the relationship between the edge distance d and each electromagnetic characteristic quantity. In this embodiment, the control unit 3 functions as a correction unit that corrects the electromagnetic characteristic quantity (physical quantity) measured by the physical quantity measuring unit 2 using an edge effect correction formula for the relationship between the edge distance d of the steel plate 300 and the electromagnetic characteristic quantity (physical quantity) and the edge distance d when measured by the physical quantity measuring unit 2. The edge effect correction formula corrects the calculated edge effect based on edge effect data and adds an offset to each electromagnetic characteristic quantity based on the edge distance d (the distance at the measurement position).

[0068] The control unit 3 outputs the acquired electromagnetic characteristic values ​​or the electromagnetic characteristic values ​​after edge effects have been corrected to the display unit 5. Furthermore, the control unit 3 can calculate predicted values ​​of the mechanical properties of the steel plate 300 being measured based on the electromagnetic characteristic values ​​and output these predicted values ​​to the display unit 5. The predicted values ​​of the mechanical properties are calculated by measuring the electromagnetic characteristic values ​​for each material based on material data previously stored in the storage unit 6. The display unit 5 displays the electromagnetic characteristic values ​​or predicted values ​​of the mechanical properties output from the control unit 3 in an appropriate format.

[0069] Figure 10This is a flowchart illustrating an example of a process for creating edge effect data. First, when measuring edge effect data, measurement conditions such as the frequency and voltage of the AC signal applied to the excitation unit 21 are set (step S1). Furthermore, the measurement conditions and the configuration of the physical quantity measurement unit 2, except for the edge distance d, are preferably identical to those used when actually measuring the steel plate 300 being measured. Next, using the set measurement conditions, the physical quantity measurement unit 2 performs a physical quantity measurement step (step S2) in which the electromagnetic characteristic quantities of the surface 301 of the steel plate 300 near the edge are measured. The measured electromagnetic characteristic quantities are then stored in the storage unit 6 (step S3). Next, a determination is made as to whether the edge distance d should be changed until the electromagnetic characteristic quantities are stored in the storage unit 6 at the desired number of edge distance conditions (step S4). If it is determined that the edge distance d should be changed ("yes" in step S4), the change in the edge distance d is implemented (step S5). The processes of steps S2 to S5 are then repeated to repeatedly measure and store the electromagnetic characteristic quantities at different edge distances d until the electromagnetic characteristic quantities are stored in the storage unit 6 at the desired number of edge distance conditions. Furthermore, it is preferable to have as many edge distance conditions as possible and to set the edge distance d intervals to be small. Furthermore, although this varies depending on the frequency of the excitation signal, it is preferable to measure from the vicinity of the edge to the range where the edge effect becomes insufficient. This allows for high-precision correction of edge effects. Furthermore, by using a scanner, encoder, or the like, it is possible to perform measurements while subtly varying the edge distance d.

[0070] After the electromagnetic characteristic quantity is measured with the required edge distance condition number, and it is determined that the edge distance d is not to be changed ("No" in step S4), it is determined whether to change the measurement sample (step S6). If it is determined that the measurement sample is to be changed ("Yes" in step S6), the measurement sample is changed (step S7). Then, the processing of steps S2 to S5 is repeated to repeatedly measure and save the electromagnetic characteristic quantity at different edge distances d until the electromagnetic characteristic quantity is saved in the storage unit 6 with the required edge distance condition number.

[0071] In addition, it is preferred that the measurement sample use a sample having manufacturing conditions and mechanical properties close to those of the actual measurement object steel plate 300. In addition, taking into account the deviation of the manufactured steel plate, it is preferred to use a plurality of measurement samples with the same manufacturing conditions, for example, to perform measurements and create edge influence data. In addition, it is preferred to use a plurality of samples with completely different steel types and manufacturing conditions to measure and save electromagnetic characteristic quantities. Thus, when the electromagnetic characteristic quantities are actually corrected using a database created by obtaining edge influence data under conditions as wide as possible for steel types and manufacturing conditions, edge influence data of conditions close to the measurement object steel plate 300 can be selected. Moreover, when it is determined that the measurement sample is not to be changed ("No" in step S6), the measurement of the electromagnetic characteristic quantities is ended (step S8) to end a series of controls.

[0072] Figure 11 This is a diagram showing the relationship between the change amount of the first electromagnetic characteristic value and the edge distance d based on edge effect data measured using five steel plates A to E.

[0073] The variation in the first electromagnetic characteristic is calculated by subtracting the average of the values ​​measured within a range unaffected by the edge from each measured value. This eliminates any material-related differences in the sensor 20 output, allowing only the variation due to the edge to be derived. Generally, the variation in the first electromagnetic characteristic near the edge of any steel plate follows a similar trend. By averaging the approximate curves, a curve representing the average variation near the edge can be obtained as a calibration curve.

[0074] exist Figure 11 Although the relationship between the first electromagnetic characteristic quantity, one of multiple electromagnetic characteristic quantities, and the edge distance d is illustrated, actual edge effect data also includes multiple other electromagnetic characteristic quantities different from the first electromagnetic characteristic quantity. Calibration curves may differ depending on the electromagnetic characteristic quantity, and therefore, it is preferable to obtain a calibration curve for each electromagnetic characteristic quantity. Furthermore, in a configuration where multiple sensors 20 are arranged in close proximity in the physical quantity measuring unit 2, there is a possibility that the sensors 20 may affect each other, and therefore, it is preferable to derive a calibration curve for each sensor 20.

[0075] Next, a method for correcting the edge effects of the electromagnetic feature values ​​by the control unit 3 will be described. Figure 123 is a flowchart showing an example of control of edge effect correction of electromagnetic characteristic quantities performed by the control unit 3. First, the control unit 3 reads the edge effect data stored in the storage unit 6 (step S11). Next, using the read edge effect data, the edge effect correction formula is calculated for each electromagnetic characteristic quantity based on the relationship between the edge distance d and the electromagnetic characteristic quantity (step S12). Next, the control unit 3 obtains the electromagnetic characteristic quantity measured by the sensor 20 of the physical quantity measuring unit 2, and performs a correction step of correcting the electromagnetic characteristic quantity by using the calculated edge effect correction formula and the edge distance d obtained in advance (step S13). Finally, the control unit 3 outputs the corrected electromagnetic characteristic quantity to the display unit 5 (step S14).

[0076] The edge effect correction formula is preferably calculated before acquiring the electromagnetic characteristic values, but it can also be calculated simultaneously with the acquisition of the electromagnetic characteristic values. Alternatively, the edge effect correction formula calculated once can be stored in the storage unit 6, and the control unit 3 can read the edge effect correction formula stored in the storage unit 6 before performing the electromagnetic characteristic value correction. Furthermore, the edge effect data and edge effect correction formula read by the control unit 3 are preferably changed according to the type of steel plate 300 being measured.

[0077] use Figure 11 The correction method for edge effects is explained below. Through the above process, a curve representing the average change near the edge can be derived as a correction curve. If the edge distance d is set, then Figure 11 The equation of the calibration curve shown above shows that the change P of the first electromagnetic characteristic value due to the edge effect can be expressed as the following mathematical formula (1).

[0078] [Formula 1]

[0079] P=f(d) …(1)

[0080] Here, if the measured value of the first electromagnetic characteristic value is set as X1 and the edge distance is set as d1, the change amount P1 of the first electromagnetic characteristic value at that position can be expressed as the following mathematical formula (2).

[0081] [Formula 2]

[0082] P1=f(d1) …(2)

[0083] Furthermore, the value X1' of the first electromagnetic characteristic value from which the edge effect is eliminated can be expressed as in the following mathematical formula (3).

[0084] [Formula 3]

[0085] X1′=X1-p1 …(3)

[0086] Figure 13: is a diagram showing the relationship between the first electromagnetic feature quantity and the edge distance d before and after edge effect correction. Figure 13 As shown, it can be confirmed that before edge effect correction, the value of the first electromagnetic characteristic quantity fluctuates greatly due to the edge effect at a position within 100 [mm] of the edge distance. On the other hand, it can be confirmed that after edge effect correction, the edge effect is eliminated (the edge effect is reduced) at a position within 100 [mm] of the edge distance, and the value of the first electromagnetic characteristic quantity becomes roughly uniform. Thus, by correcting the edge effect, accurate electromagnetic characteristic quantity derivation and mechanical characteristic prediction can be performed near the edge. In addition, when a prediction model such as generalized linear regression using multiple electromagnetic characteristic quantities is used for the prediction of mechanical characteristics, the mechanical characteristics can be accurately predicted by correcting the edge effect of all electromagnetic characteristic quantities that serve as input to the prediction model.

[0087] The aforementioned edge effect correction method utilizes the property that changes in electromagnetic signatures due to edge effects remain constant even when the material, thickness, and other characteristics of the steel plate being measured vary. On the other hand, when the material or edge shape (shape of the plate end) differs significantly from the steel plate used for edge effect data measurement, changes in electromagnetic signatures due to edge effects may become non-constant.

[0088] Therefore, two or more electromagnetic characteristic quantities of the steel plate 300 to be measured, for example, the first electromagnetic characteristic quantity and the second electromagnetic characteristic quantity, are measured. In addition, the first electromagnetic characteristic quantity and the second electromagnetic characteristic quantity are different electromagnetic characteristic quantities, and the first electromagnetic characteristic quantity and the second electromagnetic characteristic quantity are correlated with the edge distance d, and the first electromagnetic characteristic quantity and the second electromagnetic characteristic quantity are correlated via the edge distance d. Moreover, the edge influence data of each of the first electromagnetic characteristic quantity and the second electromagnetic characteristic quantity are used to derive the variation of the first electromagnetic characteristic quantity due to the edge influence. Here, the second electromagnetic characteristic quantity preferably uses an electromagnetic characteristic quantity in which the variation due to the edge influence is greater than the variation due to the difference in material and mechanical properties and is dominant.

[0089] As for the way the electromagnetic characteristic quantities near the edge change, even steel plates with different materials and mechanical properties have a common trend, and the edge effect can be corrected by using edge effect data and edge distance d. In addition, when the edge distance d is not known, the edge distance can be inferred based on the electromagnetic characteristic quantity whose change due to edge effect is greater than the change due to material and mechanical properties, and used in the correction of other electromagnetic characteristic quantities. In the case of a complex edge shape, or when the edge shape varies greatly depending on the steel plate, the change in the electromagnetic characteristic quantity near the edge sometimes becomes different. In this case, the change in the electromagnetic characteristic quantity to be corrected due to the edge effect can be directly inferred based on the electromagnetic characteristic quantity that is strongly affected by the edge effect, and the electromagnetic characteristic quantity with the edge effect eliminated can be derived.

[0090] While the above describes an embodiment in which the invention completed by the present inventors is applied, the present invention is not limited to the description and drawings of this embodiment, which form part of the disclosure of the present invention. For example, the present invention can also be applied as a measuring device constituting a manufacturing device for plate-like products, and the measuring device involved in the present invention can be used to measure the physical quantities of the plate-like products manufactured by the manufacturing device. In addition, the present invention can also be applied as a physical quantity measurement step included in a manufacturing method for plate-like products, and the physical quantities of the plate-like products manufactured in the manufacturing step can be measured. According to such a manufacturing device for plate-like products and a manufacturing method for plate-like products, plate-like products can be manufactured with a high yield.

[0091] Furthermore, the present invention can also be applied to the measurement method included in the quality management method for plate products, and the quality management of plate products can be performed by measuring the physical quantities of plate products using the measurement method involved in the present invention. Specifically, the physical quantities of plate products can be measured in the physical quantity measurement step included in the measurement method of the present invention, and the quality management of plate products can be performed based on the measurement results of the physical quantities obtained in the physical quantity measurement step. According to such a quality management method for plate products, high-quality plate products can be provided. As such, other embodiments, examples, and application technologies completed by those skilled in the art based on this embodiment are all included in the scope of the present invention.

[0092] Industrial applicability

[0093] The present invention can provide a measuring jig, a measuring device, a measuring method, a manufacturing device for a plate-like product, a quality management method for a plate-like product, and a manufacturing method for a plate-like product, which can improve the measurement accuracy of physical quantities of a surface near the edge of a measurement object.

[0094] Description of Reference Numerals

[0095] 1…measuring device; 2…physical quantity measuring unit; 3…control unit; 4…operating unit; 5…display unit; 6…storage unit; 7…sensor attachment status monitoring unit; 7a to 7d…laser rangefinder; 8…guiding unit; 9…moving unit; 10…connecting unit; 11…edge following unit; 20a to 20d…sensor; 21…excitation unit; 91…trolley; 92…handle; 93a to 93d…wheels; 101…arm; 102…cylinder; 111…arm; 112…lifting member; 113…contact member; 114…lifting fixing unit; 115…rotating shaft member; 201…excitation coil; 202…magnetizing yoke; 300…steel plate; 301…surface; 302…side; 303…edge.

Claims

1. A measuring fixture, characterized in that: have: a contact member that contacts a side surface of a plate-shaped object when a surface near an edge of the object is measured using a physical quantity measuring unit that measures a physical quantity of the object; and The holding member holds the contact member so as to maintain a constant distance between the edge and the physical quantity measuring unit in a direction perpendicular to a scanning direction in which the physical quantity measuring unit scans.

2. The measuring jig according to claim 1, wherein: The contact member is a disk-shaped rotating body having an outer peripheral surface in contact with the side surface, and is rotatably provided on the holding member via a rotation axis of the rotating body.

3. The measuring jig according to claim 1 or 2, characterized in that: The contact member includes a magnet.

4. A measuring device, characterized in that have: a physical quantity measuring unit that measures a physical quantity of a measurement object; and The measuring jig according to any one of claims 1 to 3.

5. The measuring device according to claim 4, characterized in that have: The correction unit corrects the physical quantity measured by the physical quantity measuring unit using a correction formula representing the relationship between the distance of the measured object from the edge and the physical quantity and the distance from the edge to the physical quantity measuring unit when measured by the physical quantity measuring unit.

6. A measurement method, characterized in that: have: The physical quantity measuring step comprises measuring a physical quantity of the object to be measured using the measuring jig according to any one of claims 1 to 3.

7. The measuring method according to claim 6, characterized in that have: The correction step corrects the physical quantity measured in the physical quantity measuring step using a correction formula for the relationship between the distance of the measured object from the edge and the physical quantity and the distance from the edge to the physical quantity measuring unit during the physical quantity measuring step.

8. A manufacturing device for plate-shaped products, characterized in that: have: Manufacturing apparatus for manufacturing plate-shaped products; and The measuring device according to claim 4 or 5 measures the physical quantity of the plate-like product manufactured by the manufacturing device.

9. A quality management method for plate-shaped products, characterized in that: include: a physical quantity measuring step of measuring a physical quantity of the plate-like product by the measuring method according to claim 6 or 7; and The quality control step performs quality control on the plate-shaped product based on the measurement result of the physical quantity obtained in the physical quantity measuring step.

10. A method for manufacturing a plate-like product, characterized in that: include: Manufacturing step, manufacturing plate-shaped products; and A physical quantity measuring step of measuring a physical quantity of the plate-like product manufactured in the manufacturing step by the measuring method according to claim 6 or 7.

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