Measuring jig, measuring device, measuring method, plate-shaped product manufacturing equipment, plate-shaped product quality control method, and plate-shaped product manufacturing method.

Abstract

To provide a measuring jig, a measuring device, a measuring method, a manufacturing facility for tabular products, a quality management method for tabular products, and a manufacturing method for tabular products that can improve measurement accuracy of a physical amount of a surface in the vicinity of an edge of a measurement object.SOLUTION: A measuring jig includes: a contact member which contacts a lateral surface of a measurement object when measuring a surface in the vicinity of an edge of the measurement object according to a physical amount measuring part for measuring a physical amount of a tabular measurement object; and a holding member for holding the contact member so as to keep a constant distance between an edge in a direction orthogonal to a scanning direction of scanning the physical amount measuring part, and the physical amount measuring part.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a measuring jig, a measuring device, a measuring method, a manufacturing facility for plate-shaped products, a quality control method for plate-shaped products, and a manufacturing method for plate-shaped products. [Background technology]

[0002] Conventionally, steel plates used in line pipes, ships, pressure vessels, construction machinery, and the like are manufactured through continuous casting or ingot casting, optionally followed by split rolling and forging, followed by hot rolling, heat treatment, and cutting (shearing or gas cutting). The manufactured steel plates are then shipped after undergoing visual and dimensional inspections, ultrasonic flaw detection testing, surface hardness inspections, and sampling inspections of mechanical properties. Among the steel plate defects that can be problematic in final products are defects occurring within the steel plate, and defects called hard spots or soft spots, where the surface layer of the steel plate is partially hardened or softened. One method for measuring these defects is to use a cart equipped with a measuring instrument. For example, Non-Patent Document 1 describes a measurement method using a sensor attached to a remotely controlled cart, and Non-Patent Document 2 describes a measurement method using a sensor attached to a hand-operated cart. [Prior art documents] [Non-patent literature]

[0003] [Non-Patent Document 1] Bernd Wolter, Yasmine Gabi and Christian Conrad, “Nondestructive Testing with 3MA - An Overview of Principles and Application”, Appl. Sci. 2019, 9, 1068 [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 Summary of the Invention [Problem to be solved by the invention]

[0004] Conventional defect measurement methods involve measuring defects by bringing a measuring instrument mounted on a cart into contact with the surface of the steel plate. Specifically, the measuring instrument is installed so that it is pressed against the steel plate or so that a constant distance is maintained between the measuring instrument surface and the steel plate surface. In particular, for measurements such as eddy current testing and electromagnetic measurement, where the distance between the measuring instrument and the steel plate being measured (also known as lift-off) is extremely important, the measuring instrument is installed as described above. For ultrasonic measurements, the measuring instrument is also installed in the same manner as for eddy current testing and electromagnetic measurement. Furthermore, when measuring the entire surface of a steel plate, a method is often used in which a scribed line is drawn on the surface of the steel plate using chalk or the like, and a cart is moved along this line. Furthermore, because a manually operated cart tends to meander somewhat, in order to measure the entire plate without missing any defects, the marking lines must be drawn so that the measurement ranges overlap as the cart moves along each line.

[0005] Even when measuring near the edge, the measurement is performed along the marking lines as described above. In this case, if the marking lines are drawn to minimize the non-measurement area of ​​the edge, the sensor or the wheels of the carriage may extend beyond the plate, which may result in measurement errors. Because it is difficult to create an overlap near the edge like in the center of the steel plate, the amount of carriage meandering remains in the non-measurement area, resulting in a large non-measurement area around the edge.

[0006] Another problem with measurements near edges is the edge dead zone. The edge dead zone is a range where measurements cannot be performed correctly due to the influence of the edge. In the case of electromagnetic measurements, a phenomenon called the edge effect, in which the electromagnetic field concentrates at the edge of the measurement target, can cause problems with accurate measurement and evaluation at the edge. Possible methods to reduce the dead zone include changing the inspection calibration curve or measurement conditions between the center and the edge of the steel plate, or setting correction values. However, when measuring near the edge by moving a cart over the surface of a steel plate, if the cart snakes and the distance between the edge and the sensor cannot be maintained constant in the direction perpendicular to the cart movement, the measurement accuracy of the physical quantities on the surface of the steel plate near the edge decreases.

[0007] The present invention has been made in consideration of the above-mentioned problems, and its purpose is to provide a measuring jig, a measuring device, a measuring method, a manufacturing equipment for plate-shaped products, a quality control method for plate-shaped products, and a manufacturing method for plate-shaped products that can improve the measurement accuracy of physical quantities of the surface near the edge of a measurement object. [Means for solving the problem]

[0008] In order to solve the above problems and achieve the objectives, [1] A measuring jig according to the present invention comprises a contact member that comes into contact with a side surface of a plate-shaped measurement object when measuring the surface near the edge of the measurement object using a physical quantity measuring unit that measures the physical quantity of the measurement object, and a holding member that 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.

[0009] [2] Furthermore, in the measuring jig according to the present invention, in the invention [1] above, the contact member is a disk-shaped rotating body having an outer peripheral surface that contacts the side surface, and is rotatably mounted on the holding member via the rotation axis of the rotating body.

[0010] [3] Furthermore, the measuring jig according to the present invention is the one according to the invention [1] or [2] above, wherein a magnet is provided on the contact member.

[0011] [4] A measuring device according to the present invention comprises a physical quantity measuring unit that measures a physical quantity of a measurement object, and a measuring jig according to any one of the above inventions [1] to [3].

[0012] [5] The measuring device according to the present invention, in the invention [4] above, further comprises a correction unit that corrects the physical quantity measured by the physical quantity measuring unit using a correction equation that indicates the relationship between the distance from the edge of the measurement object and the physical quantity, and the distance from the edge to the physical quantity measuring unit when measured by the physical quantity measuring unit.

[0013] [6] A measurement method according to the present invention includes a physical quantity measurement step of measuring a physical quantity of a measurement object using the measurement jig according to any one of the above [1] to [3] inventions.

[0014] [7] The measurement method according to the present invention is the measurement method according to the invention [6], further comprising: determining a relationship between the distance from the edge of the measurement object and the physical quantity. show The method further includes a correction step of correcting the physical quantity measured in the physical quantity measuring step by using a correction formula and the distance from the edge to the physical quantity measuring unit at the time of the physical quantity measuring step.

[0015] [8] The manufacturing equipment for plate-shaped products according to the present invention comprises a manufacturing device for manufacturing plate-shaped products and a measuring device according to the invention [4] or [5] above for measuring the physical quantities of the plate-shaped products manufactured by the manufacturing device.

[0016] [9] The quality control method for plate-like products according to the present invention includes a physical quantity measurement step of measuring the physical quantities of the plate-like products using the measurement method of the invention [6] or [7] above, and a quality control step of performing quality control of the plate-like products based on the measurement results of the physical quantities obtained by the physical quantity measurement step.

[0017]

[10] The method for manufacturing a plate-shaped product according to the present invention includes a manufacturing step for manufacturing a plate-shaped product, and a physical quantity measurement step for measuring the physical quantity of the plate-shaped product manufactured in the manufacturing step by the measurement method of the invention of [6] or [7] above. [Effects of the Invention]

[0018] The measuring jig, measuring device, measuring method, manufacturing equipment for plate-shaped products, quality control method for plate-shaped products, and manufacturing method for plate-shaped products according to the present invention can maintain a constant distance between the edge of the measurement object and the physical quantity measuring unit when measuring near the edge. As a result, the measuring jig, measuring device, measuring method, manufacturing equipment for plate-shaped products, quality control method for plate-shaped products, and manufacturing method for plate-shaped products according to the present invention have the effect of reducing non-measurement ranges and dead zones and improving measurement accuracy. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 1 is a side view showing a schematic configuration of a measurement device according to the first embodiment. [Figure 2] FIG. 2 is a diagram of the measurement device according to the first embodiment as seen from the rear side in the scanning direction. [Figure 3] FIG. 3 is a block diagram showing the configuration of the measurement device according to the first embodiment. [Figure 4] 4(a) is a plan view showing an example of the configuration of the physical quantity measuring unit, and FIG. 4(b) is a side view showing an example of the configuration of the physical quantity measuring unit. [Figure 5] FIG. 5 is a side view of the sensor of the physical quantity measuring unit. [Figure 6] FIG. 6 is a plan view of the sensor of the physical quantity measuring unit. [Figure 7] FIG. 7 is a diagram showing a first example of the waveform of an AC signal (AC voltage) applied to the excitation coil. [Figure 8] FIG. 8 is a diagram showing a second example of the waveform of the AC signal (AC voltage) applied to the excitation coil. [Figure 9]9(a) is a diagram showing a map of physical quantities when the surface physical quantities in the region near the edge of the steel sheet are measured without using an edge follower, and FIG. 9(b) is a diagram showing a map of physical quantities when the surface physical quantities in the region near the edge of the steel sheet are measured with an edge follower. [Figure 10] FIG. 10 is a flowchart showing an example of a procedure for creating edge influence data. [Figure 11] FIG. 11 is a diagram showing the relationship between the amount of change in the first electromagnetic feature amount and the edge distance, based on the edge influence data measured for five steel plates A to E. [Figure 12] FIG. 12 is a flowchart showing an example of control of edge influence correction of electromagnetic feature quantities by the control unit. [Figure 13] FIG. 13 is a diagram showing the relationship between the first electromagnetic feature amount and the edge distance before and after the edge effect correction. DETAILED DESCRIPTION OF THE INVENTION

[0020] (Embodiment 1) A measuring jig and a measuring device according to a first embodiment of the present invention will be described below, although the present invention is not limited to this embodiment.

[0021] Fig. 1 is a side view showing a schematic configuration of a measurement device 1 according to embodiment 1. Fig. 2 is a view of the measurement device 1 according to embodiment 1 as seen from the rear side in the scanning direction. Fig. 3 is a block diagram showing the configuration of the measurement device 1 according to embodiment 1.

[0022] The measuring device 1 according to the first embodiment is movable by an operator and measures the mechanical properties of the surface layer of a steel plate 300. In this embodiment, the hardness of the surface layer of the steel plate 300 is calculated from the electromagnetic feature quantity of the surface layer of the steel plate 300. Therefore, the measurement object is the steel plate 300, and the measured physical quantity is the electromagnetic feature quantity of the surface layer. An example of the steel plate 300 is a thick steel material that is used to make steel pipes used in line pipes, etc. As shown in FIGS. 1 to 3 , the measuring device 1 according to the first embodiment includes a physical quantity measuring unit 2, a control unit 3, an operation unit 4, a display unit 5, a memory unit 6, a sensor adhesion status monitoring unit 7, a guidance unit 8, a movement unit 9, a connection unit 10, and an edge following unit 11.

[0023] The physical quantity measuring unit 2 includes an ultrasonic sensor and sensors for eddy current flaw detection and electromagnetic measurement. FIG. 4 is a plan view and a side view showing an example of the configuration of the physical quantity measuring unit 2. In this embodiment, as shown in FIGS. 4(a) and 4(b), the physical quantity measuring unit 2 includes multiple sensors 20a to 20h (eight sensors, Ch. 1 to Ch. 8, in this example). In the following description, when the sensors 20a to 20h are not particularly distinguished, they will be simply referred to as sensors 20. While the physical quantity measuring unit 2 may include only one sensor 20, including multiple sensors 20 is preferable because it can widen the range of the steel plate 300 that can be scanned at one time and improve measurement efficiency. Each sensor 20 is configured so that it can be pressed against the surface 301 of the steel plate 300 by pressing the physical quantity measuring unit 2 downward via a connection unit 10 or the like.

[0024] Returning to Fig. 3, the control unit 3 includes an arithmetic processing device 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. By using an information processing device such as a tablet or PC, the control unit 3, operation unit 4, and display unit 5 may be partly or entirely integrated.

[0025] The operation unit 4 is equipped with input devices such as a keyboard, a mouse pointer, a touchpad, etc. The operation unit 4 is operated when inputting the operation amount or content required to operate 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 capable of setting the required operation amount, such as a toggle switch (dial switch).

[0026] The display unit 5 is configured with 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, as well as operation information related to the physical quantity measuring unit 2 and the control unit 3. In this embodiment, the display unit 5 displays the measurement results on a map of the steel plate 300. Specifically, the display unit 5 displays positions on the steel plate 300 where the mechanical properties of the steel plate 300 are preset values ​​on the map of the steel plate 300. The display unit 5 may also display the scanning speed and movement amount of the cart during measurement. The display unit 5 may also display the monitoring results of the material adhesion status of the sensor 20 output from the sensor material adhesion status monitoring unit 7. The display unit 5 may also notify the measurement results by voice.

[0027] In order for the physical quantity measuring unit 2 to correctly measure the physical quantities of the steel sheet 300, it is preferable that the sensor 20 of the physical quantity measuring unit 2 is pressed against the steel sheet 300 so as to be in contact with the surface 301 of the steel sheet 300, or that a constant distance is maintained between the surface 301 of the steel sheet 300 and the sensor 20 of the physical quantity measuring unit 2. However, waviness in the surface 301 of the steel sheet 300 can prevent the physical quantity measuring unit 2 from accurately following the surface 301 of the steel sheet 300, which can weaken the pressing force of the physical quantity measuring unit 2 and cause the physical quantity measuring unit 2 to move away from the steel sheet 300, or the distance between the surface 301 of the steel sheet 300 and the physical quantity measuring unit 2 cannot be maintained constant, resulting in some locations where measurement is not performed correctly. In this case, it is preferable to provide a sensor adhesion status monitoring unit 7, which will be described next.

[0028] The sensor adhesion status monitoring unit 7 is a device that monitors whether the sensor 20 of the physical quantity measuring unit 2 is properly attached to the surface 301 of the steel sheet 300 and / or whether a constant distance is maintained between the surface 301 of the steel sheet 300 and the sensor surface. In this embodiment, as shown in FIGS. 4(a) and 4(b), the sensor adhesion status monitoring unit 7 monitors the adhesion status of the sensor 20 by measuring the distance between the sensor 20 and the steel sheet 300 using laser range finders 7a to 7d attached on a line passing through the longitudinal center position of the sensor 20 constituting the physical quantity measuring unit 2. The sensor adhesion status monitoring unit 7 is not limited to the laser range finder, and an eddy current range finder or a contact type touch sensor may also be used to monitor the adhesion status of the sensor 20.

[0029] Returning to FIG. 3 , the guidance unit 8 is a device that guides the physical quantity measuring unit 2 during scanning relative to a marking line drawn on the surface 301 of the steel plate 300. Specifically, the guidance unit 8 projects three line laser beams parallel to one marking line to guide the physical quantity measuring unit 2. In this embodiment, the three line laser beams are spaced apart by a width of PL. The means is not limited to projecting three line laser beams onto the marking line, and for example, three guide members may be placed relative to the marking line, or an image of the marking line may be captured by an imaging unit and an image in which images of the three guide lines are superimposed on the captured image of the marking line may be displayed on the display unit 5.

[0030] The moving unit 9 includes, for example, a hand-pushed cart (trolley). More specifically, the moving unit 9 includes a cart 91 that can move and carry the physical quantity measuring unit 2, the control unit 3, the operation unit 4, the display unit 5, the memory unit 6, the sensor adhesion status monitoring unit 7, the guidance unit 8, the connection unit 10, and the edge following unit 11, and a handle 92 that allows an operator to control the movement of the cart 91 (for example, the amount of movement, the speed of movement, the direction of movement, etc.), and causes the physical quantity measuring unit 2 to scan the surface 301 of the steel plate 300. Four wheels 93a to 93d are attached to the cart 91. 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, because the cart 91 is equipped with wheels 93a to 93d, the operator can control the movement amount, movement speed, and movement direction of the physical quantity measuring unit 2 by pushing the handle 92, thereby causing the physical quantity measuring unit 2 to scan. As shown in FIGS. 1(a) and 1(b), when the moving unit 9 is equipped with four wheels 93a to 93d, it is preferable that each wheel be arranged facing inward with respect to the scanning direction in order to improve linearity during scanning. Note that the moving unit 9 is not limited to a configuration in which it is moved by being pushed by the operator, and may be configured to move automatically, for example.

[0031] The connection unit 10 is a means for connecting the physical quantity measuring unit 2 and the control unit 3 placed inside the carriage 91. The connection unit 10 includes an arm 101 that positions the physical quantity measuring unit 2 forward in the scanning direction of the carriage 91, and a cylinder 102 that holds the physical quantity measuring unit 2 so that the sensor 20 of the physical quantity measuring unit 2 can be properly positioned on the surface 301 of the steel plate 300 and / or so that the distance between the surface 301 of the steel plate 300 and the sensor surface can be kept constant. The connection unit 10 can hold the physical quantity measuring unit 2 in a position that does not interfere with the movement of the carriage 91, and can hold the physical quantity measuring unit 2 so that the sensor 20 of the physical quantity measuring unit 2 can be properly positioned on the surface 301 of the steel plate 300 and / or so that the distance between the surface 301 of the steel plate 300 and the sensor surface can be kept constant. Furthermore, the connection unit 10 may have a function of electrically connecting to the control unit 3 so that the output of the sensor 20 of the physical quantity measuring unit 2 is transmitted to the control unit 3. In addition, the connection unit 10 may have a function of electrically connecting the guidance unit 8 and the control unit 3 so that the position adjustment and control of the line laser light of the guidance unit 8 can be performed by the control unit 3 and the operation unit 4.

[0032] The connection unit 10 may be provided with a drive unit (not shown) to ensure that the sensor 20 of the physical quantity measuring unit 2 is correctly positioned on the surface 301 of the steel plate 300 and / or to maintain a constant distance between the surface 301 of the steel plate 300 and the sensor surface. The control unit 3 and the end of the arm 101 to which the physical quantity measuring unit 2 is not connected are connected to this drive unit. The drive unit moves the arm 101 up and down and / or extends and retracts the cylinder 102 in the vertical direction, thereby enabling the sensor 20 of the physical quantity measuring unit 2 to be positioned correctly. The drive unit is preferably controlled by the control unit 3. The control unit 3 sets a drive amount based on input from the operation unit 4 and / or output from the sensor-positioning status monitoring unit 7, and operates the drive unit based on the drive amount.

[0033] The edge following unit 11 is a measurement jig that restrains the moving unit 9 with respect to the steel plate 300 and maintains a constant distance between the sensor 20 of the physical quantity measuring unit 2 and the edge 303 of the steel plate 300. The edge following unit 11 has an arm 111, a lifting member 112, a contact member 113, a lifting and lowering fixing unit 114, and a rotating shaft member 115. The arm 111 is a support member that is elongated in a width direction perpendicular to the scanning direction (movement direction) of the moving unit 9. One end of the arm 111 is fixed to a side surface of the carriage 91 in the width direction. An L-shaped lifting and lowering member 112 that is elongated in the vertical direction is provided at the other end of the arm 111 so as to be movable up and down relative to the arm 111. The lifting and lowering fixing unit 114 is configured so as to be able to fix the lifting and lowering member 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, with its axis extending in the vertical direction. A contact member 113 is rotatably mounted on the rotating shaft member 115. The contact member 113 is a disk-shaped rotating body having an outer circumferential surface that contacts the side surface 302 of the steel plate 300. As a result, the contact member 113 moves along the side surface 302 of the steel plate 300 while rotating, thereby allowing the moving part 9 to move smoothly over the surface 301 of the steel plate 300. Furthermore, if the steel plate 300 is magnetic, it is preferable to provide a magnet on the contact member 113, for example. This prevents the contact member 113 from separating from the side surface 302 of the steel plate 300 due to the magnetic attraction force of the magnet provided on the contact member 113. Here, the magnet provided on the contact member 113 may be 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 flaw detection. Basically, the magnetic field is concentrated near the edge, narrowing the apparent range of influence, and therefore, it is expected that the influence on eddy current flaw detection will be minor. Furthermore, a permanent magnet is more preferable because it allows for a smaller size. 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) scans.

[0034] When measuring the physical quantities near the edge 303 of the steel plate 300 using the measuring device 1 according to the first embodiment, the elevation member 112 is moved up and down relative to the arm 111 to adjust the height so that the outer circumferential surface of the contact member 113 contacts the side surface 302 of the steel plate 300. The vicinity of the edge may be, for example, a range up to 120 mm from the end (edge) in the width direction of the steel plate, and may be defined as a range in which the physical quantities actually measured by the physical quantity measuring unit 2 change compared to the central portion in the width direction of the steel plate. In the measuring device 1 according to the first embodiment, the outer circumferential surface of the contact member 113 is brought into contact with the side surface 302 of the steel plate 300, and the moving unit 9 is moved in the scanning direction while the moving unit 9 follows the edge 303. This allows the moving unit 9 to move while maintaining a constant distance between the moving unit 9 and the edge 303 of the steel plate 300, and thus a constant distance between the sensor 20 of the physical quantity measuring unit 2 and the edge 303 of the steel plate 300. Therefore, in the measuring device 1 of embodiment 1, the physical quantity of the surface 301 in the area near the edge of the steel plate 300 can be measured by the physical quantity measuring unit 2 while following the edge 303 (side surface 302) of the steel plate 300 and keeping the distance between the sensor 20 and the edge 303 constant.

[0035] Furthermore, when measuring physical quantities other than those near the edge 303 of the steel plate 300 using the physical quantity measuring unit 2, if the surface 301 of the steel plate 300 interferes with the contact member 113, the lifting member 112 is moved upward to move the contact member 113 back above the steel plate 300.

[0036] Furthermore, depending on the steel plate 300 to be measured, 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 unit 2) in the steel plate width direction, may change. For this reason, the edge following unit 11 may be configured, for example, so that the lifting member 112 can be moved relative to the arm 111 in the arm longitudinal direction (steel plate width direction) by a slide mechanism. In this case, for example, the lifting fixing unit 114 may be configured so that the lifting member 112 can be fixed at any position in the arm longitudinal direction relative to the arm 111. Then, by sliding the lifting member 112 relative to the arm 111 in the arm longitudinal direction to change the distance between the carriage 91 and the contact member 113 in the arm longitudinal direction, the distance between the edge 303 and the sensor 20 (physical quantity measuring unit 2) in the steel plate width direction can be adjusted.

[0037] Furthermore, when measuring the entire surface of the steel plate 300 using the measuring device 1 according to the first embodiment, it is generally necessary to reverse the scanning direction (movement direction) and move the moving unit 9 when it reaches the end of the surface 301 of the steel plate 300 in the scanning direction (traveling direction). Therefore, it is desirable to provide the edge following units 11 on both the left and right sides of the scanning direction (traveling direction) of the moving unit 9. Furthermore, in a configuration in which only one contact member 113 of the edge following unit 11 contacts the side surface 302 of the steel plate 300, there is a risk that the moving unit 9 will rotate on the surface 301 of the steel plate 300 around the contact point between the side surface 302 of the steel plate 300 and the contact member 113 of the edge following unit 11 as the center of rotation, changing the orientation of the moving unit 9. Therefore, it is desirable to provide at least two edge following units 11, one before the other and one after the other in the scanning direction (traveling direction) of the moving unit 9.

[0038] FIG. 5 is a side view of the sensor 20 of the physical quantity measuring unit 2. FIG. 6 is a plan 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 magnetization yoke 202. In the example shown in FIG. 5, the magnetization yoke 202 has two legs 202a and 202b, and the excitation coil 201 is wound around a yoke part 202c between the legs 202a and 202b. The excitation coil 201 of the sensor 20 is connected to an 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 to excite the excitation coil 201, a magnetic field is generated in the steel sheet 300 via the magnetization yoke 202, and the electromagnetic feature quantity of the steel sheet 300 can be obtained as a change in the output signal of the excitation coil 201. The electromagnetic characteristic quantity is a physical quantity that is directly or indirectly related to, for example, the magnetization amount, differential permeability, eddy current signal (eddy current impedance), harmonic components, and coercive force. In this embodiment, an example will be described in which one type of excitation coil 201 is used, but a detection coil may be provided separately from the excitation coil 201. Furthermore, the detection coil is not limited to being wound around the magnetization yoke 202 in the same way as the excitation coil 201, and may be wound around a magnetization yoke other than the magnetization yoke 202 around which the excitation coil 201 is wound, or may be used without being wound around the magnetization yoke.

[0039] Here, in this embodiment, as shown in Figures 5 and 6, when the foot portion 202a and the foot portion 202b are arranged side by side in the width direction of the steel plate, the distance between the center line L1 of the sensor 20 in the width direction of the steel plate and the edge 303 of the steel plate 300 is defined as the edge distance d.

[0040] In the measuring device 1 according to the first embodiment, the excitation coils 201 constituting each of the multiple sensors 20a to 20h of the physical quantity measuring unit 2 are simultaneously excited by the excitation unit 21, thereby making it possible to simultaneously measure local electromagnetic feature quantities at multiple locations on the steel plate 300.

[0041] The excitation unit 21 applies an AC signal (AC voltage) to the excitation coil 201 of the sensor 20 located close to the steel sheet 300, thereby acquiring a signal including an electromagnetic feature of the steel sheet 300. In this embodiment, it is preferable to measure the electromagnetic feature by eddy current testing or 3MA (Micromagnetic Multiparameter Microstructure and Stress Analysis) technology using such excitation unit 21 and sensor 20. For example, the excitation unit 21 applies an AC signal (AC voltage) with two superimposed frequencies as shown in FIG. 7 and an AC signal (AC voltage) with a single frequency as shown in FIG. 8 to the excitation coil 201 in two separate applications, thereby measuring the electromagnetic feature. A signal obtained by applying an AC signal (AC voltage) with a single frequency as shown in FIG. 5 is generally called an eddy current signal, and is particularly suitable for flaw detection in the surface layer of the steel sheet 300. In eddy current testing, the amplitude and phase of the eddy current signal are used to detect surface defects on the steel sheet 300, utilizing the phenomenon that eddy currents on the surface 301 of the steel sheet 300, which are excited by applying an AC signal (AC voltage) to the excitation coil 201, change depending on the presence or absence of surface defects.

[0042] In addition, Figs. to 8 7 and 8. However, by using both of the two types of AC signals (AC voltages) shown in Fig. 7 and 8, it is possible to measure a large number of electromagnetic feature quantities with different characteristics. Therefore, it is preferable to use both of the two types of AC signals (AC voltages) shown in Fig. 7 and 8 and apply these two types of AC signals (AC voltages) to the excitation coil 201 in two separate applications in terms of correcting the edge effect and estimating the mechanical characteristics.

[0043] Furthermore, the range on the surface 301 of the steel sheet 300 where the electromagnetic feature quantity is measured varies depending on the size of the sensor 20 (excitation coil 201 and magnetization yoke 202) and the frequency of the AC signal (AC voltage) applied to the excitation coil 201. When an AC signal (AC voltage) is applied, the magnetic field is concentrated in the surface layer of the steel sheet 300 due to the skin effect, and as a result, the electromagnetic feature quantity of the surface layer is measured. The range where the electromagnetic feature quantity is measured is averaged over the range where the magnetic field is distributed. Therefore, when measuring the electromagnetic feature quantity locally, it is preferable to make the sensor 20 (excitation coil 201 and magnetization yoke 202) small and select the frequency of the AC signal (AC voltage) applied to the excitation coil 201 so that the skin depth corresponds to the depth range to be measured.

[0044] Furthermore, in the measuring device 1 according to the first embodiment, without moving the steel plate 300, the moving unit 9 is caused to travel in the scanning direction on the surface 301 of the steel plate 300 to move the physical quantity measuring unit 2, while measuring the physical quantities (electromagnetic feature quantities) of the entire surface of the steel plate 300 by the physical quantity measuring unit 2. Note that the physical quantities (electromagnetic feature quantities) of the entire surface of the steel plate 300 may be measured by the physical quantity measuring unit 2 by moving the steel plate 300 without moving the physical quantity measuring unit 2.

[0045] The measuring device 1 according to the first embodiment may also include, for example, a rotary encoder as a travel distance acquisition unit that acquires the travel distance of the physical quantity measurement unit 2 on the surface 301 of the steel plate 300. The measuring device 1 according to the first embodiment may also include, for example, an eddy current or laser edge position detection sensor as an edge position detection unit that detects the edge position of the steel plate 300. The rotary encoder and the edge position detection sensor may be used in combination to derive the edge distance d when measuring the physical quantity (electromagnetic feature quantity) of the surface 301 near the edge of the steel plate 300.

[0046] FIG. 9(a) is a diagram showing a map of physical quantities obtained when measuring the physical quantities of the surface 301 in the near-edge region of the steel plate 300 without using the edge tracking unit 11. Here, a marking was made on the surface 301 of the steel plate 300 so that the edge distance d was 10 mm, and the electromagnetic feature quantities were measured along the marking. As shown in FIG. 9(a), it can be seen that there is a large variation in brightness in the near-edge region of the steel plate 300, and the measured values ​​of the electromagnetic feature quantities fluctuate greatly. This is thought to be because, when measuring the physical quantities of the surface 301 in the near-edge region of the steel plate 300 using the measurement device 1, the cart 91 is less likely to move in a straight line compared to the central part in the width direction of the steel plate due to the risk of the cart 91 falling off the steel plate 300, and the edge distance d is not kept constant but fluctuates greatly.

[0047] FIG. 9(b) is a diagram showing a map of physical quantities obtained when the physical quantities of the surface 301 in the near-edge region of the steel sheet 300 are measured using the edge tracking unit 11. Here, the edge tracking unit 11 was adjusted so that the edge distance d was 10 mm, and the electromagnetic feature quantities were measured. As shown in FIG. 9(b), it can be seen that, compared to FIG. 9(a), there is less variation in brightness in the near-edge region of the steel sheet 300, and the fluctuations in the measured values ​​of the electromagnetic feature quantities in the near-edge region are smaller. This is thought to be because the edge distance d is kept constant by the edge tracking unit 11.

[0048] As described above, in the measuring device 1 of embodiment 1, the edge distance d can be kept constant using the edge tracking unit 11, thereby improving the measurement accuracy of the physical quantity (electromagnetic feature quantity) of the surface 301 in the area near the edge of the steel plate 300.

[0049] (Embodiment 2) A measurement device and a measurement method according to a second embodiment of the present invention will be described below. 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.

[0050] When electromagnetic measurements, such as eddy current measurements on the surface of a steel sheet 300, are performed using the physical quantity measurement unit 2 of the measurement device 1 according to the second embodiment, a problem exists: measurement results cannot be accurately evaluated due to a phenomenon called the edge effect, in which the electromagnetic field concentrates at the edge of the steel sheet 300. To solve this problem, the present inventors conducted extensive research to investigate the relationship between multiple electromagnetic feature quantities and the edge distance d. As a result, the present inventors found that, although the manner of change varies depending on each electromagnetic feature quantity, there is a common trend of change near the edge for multiple steel sheets with different materials and mechanical properties, making it possible to correct for the edge effect. Furthermore, the present inventors found that by using an electromagnetic feature quantity that changes more due to the edge effect than due to changes due to the material or mechanical properties, it is possible to estimate the edge distance d or the amount of variation due to the edge effect of other electromagnetic feature quantities. As a result, the present inventors found that edge effect correction is possible even when, for example, the edge distance d cannot be directly measured due to the complex shape of the steel sheet edge.

[0051] In the measuring device 1 according to the second embodiment, the control unit 3 performs predetermined processing on a received signal acquired by the excitation unit 21 provided in the sensor 20 of the physical quantity measuring unit 2, thereby acquiring a plurality of electromagnetic feature quantities that vary depending on the material of the steel sheet 300. Edge influence data and material data are stored in the memory unit 6, and these data are read out when the control unit 3 performs edge influence correction and material prediction. Furthermore, based on the edge influence data and material data, an edge influence correction formula and a material prediction formula calculated in advance by the control unit 3 may be stored in the memory unit 6. The control unit 3 corrects the electromagnetic feature quantities that have varied due to the edge influence by using the edge influence data stored in the memory unit 6. The edge influence data is obtained by measuring the electromagnetic feature quantities in advance for a plurality of steel sheets 300 having different materials while changing the edge distance d, and is measurement data that represents the relationship between the edge distance d and each electromagnetic feature quantity. In this embodiment, the control unit 3 functions as a correction unit that corrects the electromagnetic feature quantity (physical quantity) measured by the physical quantity measurement unit 2, using an edge influence correction formula that indicates the relationship between the edge distance d in the steel plate 300 and the electromagnetic feature quantity (physical quantity) and the edge distance d measured by the physical quantity measurement unit 2. The edge influence correction formula is a formula that corrects the edge effect calculated based on the edge influence data, and adds an offset to each electromagnetic feature quantity according to the edge distance d (distance of the measurement position).

[0052] The control unit 3 outputs the acquired electromagnetic feature quantities or the electromagnetic feature quantities for which edge effects have been corrected to the display unit 5. Furthermore, it is also possible to calculate predicted values ​​of the mechanical properties of the steel sheet 300 to be measured based on the electromagnetic feature quantities, and output these predicted values ​​to the display unit 5. The calculation of the predicted values ​​of the mechanical properties is performed by measuring the electromagnetic feature quantities for each material and based on material data stored in advance in the storage unit 6. The display unit 5 displays the predicted values ​​of the electromagnetic feature quantities or mechanical properties output from the control unit 3 in an appropriate format.

[0053] FIG. 10 is a flowchart showing an example of a procedure for creating edge influence data. First, when measuring edge influence data, measurement conditions such as the frequency and voltage of the AC signal applied to the excitation unit 21 are set (step S1). Note that it is preferable that the measurement conditions, excluding the edge distance d, and the configuration of the physical quantity measurement unit 2 are exactly the same as when actually measuring the steel sheet 300 to be measured. Next, using the set measurement conditions, a physical quantity measurement step is executed in which the physical quantity measurement unit 2 measures electromagnetic feature quantities of the surface 301 in the edge vicinity region of the steel sheet 300 to be measured (step S2). Next, the measured electromagnetic feature quantities are stored in the storage unit 6 (step S3). Next, it is determined whether or not to change the edge distance d until the electromagnetic feature quantities are stored in the storage unit 6 for the required number of edge distance conditions (step S4). If it is determined that the edge distance d should be changed (Yes in step S4), the edge distance d is changed (step S5). Then, the processes of steps S2 to S5 are repeatedly executed to repeatedly measure and store electromagnetic feature quantities at different edge distances d until the electromagnetic feature quantities are stored in the storage unit 6 with the required number of edge distance conditions. It is preferable to increase the required number of edge distance conditions as much as possible and to set the edge distance d at fine intervals. Furthermore, although this differs depending on the frequency of the excitation signal, it is preferable to perform measurements covering a range from the vicinity of the edge to where the edge effect is sufficient. This makes it possible to accurately correct the edge effect. Furthermore, by using a scanner, encoder, or the like, it is possible to perform measurements while finely changing the edge distance d.

[0054] When measurement of electromagnetic features is completed for the required number of edge distance conditions and it is determined that the edge distance d will not be changed (No in step S4), it is determined whether or not to change the measurement sample (step S6). When it is determined that the measurement sample will be changed (Yes in step S6), the measurement sample is changed (step S7). Then, the processes of steps S2 to S5 are repeatedly executed, and measurement and storage of electromagnetic features for different edge distances d are repeated until electromagnetic features are stored in storage unit 6 for the required number of edge distance conditions.

[0055] It is preferable to use measurement samples that have manufacturing conditions and mechanical properties similar to those of the steel sheet 300 that is the actual measurement target. Furthermore, taking into account variations in manufactured steel sheets, it is preferable to perform measurements on multiple measurement samples with the same manufacturing conditions, for example, to create edge influence data. It is also preferable to measure and save electromagnetic features using multiple samples with completely different steel types and manufacturing conditions. This makes it possible to select edge influence data that is similar to the conditions of the steel sheet 300 that is the measurement target when actually correcting electromagnetic features, using a database created by acquiring edge influence data under as wide a range of conditions as possible regarding steel types and manufacturing conditions.

[0056] FIG. 11 is a diagram showing the relationship between the amount of change in the first electromagnetic feature amount and the edge distance d, based on the edge influence data measured for five steel plates A to E.

[0057] The amount of change in the first electromagnetic feature is calculated by dividing each measurement value by the average of the values ​​measured in the range not affected by the edge. This makes it possible to remove the difference in output of the sensor 20 due to the material and derive only the amount of change due to the edge effect. Generally, for any steel sheet, the change in the first electromagnetic feature near the edge has the same tendency, and by averaging each approximation curve, a curve representing the average change near the edge can be obtained as a correction curve.

[0058] 11 illustrates the relationship between the first electromagnetic feature, which is one of the multiple electromagnetic feature quantities, and the edge distance d. However, actual edge influence data also includes multiple other electromagnetic feature quantities other than the first electromagnetic feature quantity. Because the correction curve may differ depending on the electromagnetic feature quantity, it is preferable to obtain a correction curve for each electromagnetic feature quantity individually. Furthermore, in a configuration in which multiple sensors 20 of the physical quantity measurement unit 2 are arranged in close proximity, the sensors 20 may affect each other, so it is preferable to derive a correction curve for each sensor 20.

[0059] Next, a method for correcting the edge influence of an electromagnetic feature quantity by the control unit 3 will be described. FIG. 12 is a flowchart showing an example of control of edge influence correction of an electromagnetic feature quantity by the control unit 3. First, the control unit 3 reads the edge influence data stored in the storage unit 6 (step S11). Next, using the read edge influence data, the control unit 3 calculates an edge influence correction formula for each electromagnetic feature quantity from the relationship between the edge distance d and the electromagnetic feature quantity (step S12). Next, the control unit 3 acquires the electromagnetic feature quantity measured by the sensor 20 of the physical quantity measurement unit 2, and executes a correction step in which the electromagnetic feature quantity is corrected by using the calculated edge influence correction formula and the edge distance d acquired in advance (step S13). Finally, the control unit 3 outputs the corrected electromagnetic feature quantity to the display unit 5 (step S14).

[0060] Note that, although it is preferable to complete the calculation of the edge influence correction formula before acquiring the electromagnetic feature quantities, it may also be performed simultaneously with the acquisition of the electromagnetic feature quantities. Also, the edge influence correction formula once calculated may be stored in the storage unit 6, and the edge influence correction formula stored in the storage unit 6 may be read by the control unit 3 before correcting the electromagnetic feature quantities. Also, it is preferable to change the edge influence data and edge influence correction formula read by the control unit 3 depending on the type of steel plate 300 to be measured.

[0061] The method for correcting edge effects will be explained using Figure 11. By using the procedure described above, a curve that represents the average change near the edge can be derived as a correction curve. Edge distance of Assuming that d is used, the amount of change P in the first electromagnetic feature amount due to the edge influence can be expressed as the following formula (1), which is an equation representing the correction curve shown in FIG.

[0062]

number

[0063] Here, if the measured value of the first electromagnetic characteristic amount is X1 and the edge distance is d1, the amount of change P1 in the first electromagnetic characteristic amount at this position can be expressed as in the following equation (2).

[0064]

number

[0065] Then, the value X1' of the first electromagnetic feature quantity from which the edge effect has been removed can be expressed as in the following equation (3).

[0066]

number

[0067] FIG. 13 shows the relationship between the first electromagnetic feature and the edge distance d before and after edge effect correction. As shown in FIG. 13, before edge effect correction, the value of the first electromagnetic feature fluctuates significantly due to the edge effect at positions within an edge distance of 100 mm. On the other hand, after edge effect correction, the value of the first electromagnetic feature becomes almost uniform at positions within an edge distance of 100 mm, with the edge effect being eliminated (reduced). Thus, correcting the edge effect enables accurate derivation of electromagnetic feature values ​​and prediction of mechanical properties even near edges. Furthermore, when a prediction model such as generalized linear regression using multiple electromagnetic feature values ​​is used to predict mechanical properties, correcting the edge effect for all electromagnetic feature values ​​that are input to the prediction model enables accurate prediction of mechanical properties.

[0068] Here, the above-described edge effect correction method utilizes the fact that changes in electromagnetic feature quantities due to edge effects remain constant even when the material, thickness, etc. of the steel plate being measured changes. However, if the material or edge shape (shape of the plate edge) is significantly different from that of the steel plate used to measure the edge effect data, the changes in electromagnetic feature quantities due to edge effects may not remain constant.

[0069] Therefore, two or more electromagnetic feature quantities, for example, a first electromagnetic feature quantity and a second electromagnetic feature quantity, are measured for the steel sheet 300 to be measured. The first electromagnetic feature quantity and the second electromagnetic feature quantity are different from each other, and the first electromagnetic feature quantity and the second electromagnetic feature quantity are correlated with the edge distance d, and the first electromagnetic feature quantity and the second electromagnetic feature quantity are correlated via the edge distance d. Then, edge influence data for each of the first electromagnetic feature quantity and the second electromagnetic feature quantity is used to derive the amount of variation in the first electromagnetic feature quantity due to edge influence. Here, it is preferable to use an electromagnetic feature quantity for which the change due to edge influence is larger and more dominant than the change due to differences in material or mechanical properties.

[0070] The way electromagnetic features change near edges has a common tendency even for steel sheets with different materials and mechanical properties, and edge effects can be corrected using edge effect data and edge distance d. Furthermore, if the edge distance d is unknown, the edge distance can be estimated from electromagnetic features that change more significantly due to edge effects than changes due to material and mechanical properties, and can be used to correct other electromagnetic features. When the edge shape is complex or varies significantly depending on the steel sheet, the changes in electromagnetic features near edges may not be uniform. In such cases, it is possible to derive electromagnetic features from which edge effects have been removed by directly estimating the amount of variation due to edge effects in the electromagnetic feature to be corrected from the electromagnetic feature that is strongly affected by edge effects.

[0071] The above describes an embodiment of the invention developed by the present inventors, but the present invention is not limited to the description and drawings that form part of the disclosure of the present invention according to this embodiment. For example, the present invention may be applied as a measurement device constituting a plate-shaped product manufacturing facility, and the measurement device according to the present invention may measure physical quantities of plate-shaped products manufactured by the manufacturing facility. Furthermore, the present invention may be applied as a physical quantity measurement step included in a plate-shaped product manufacturing method, and the physical quantities of plate-shaped products manufactured in the manufacturing step may be measured. Such plate-shaped product manufacturing facility and plate-shaped product manufacturing method enable plate-shaped products to be manufactured with a high yield.

[0072] Furthermore, the present invention may be applied to a measurement method included in a quality control method for plate-like products, and quality control of plate-like products may be performed by measuring the physical quantities of the plate-like products using the measurement method of the present invention. Specifically, the physical quantities of the plate-like products are measured in a physical quantity measurement step included in the measurement method of the present invention, and the quality control of the plate-like products can be performed based on the measurement results of the physical quantities obtained in the physical quantity measurement step. Such a quality control method for plate-like products can provide high-quality plate-like products. As such, all other embodiments, examples, operational techniques, etc. made by those skilled in the art based on this embodiment are included in the scope of the present invention. [Explanation of symbols]

[0073] 1. Measuring equipment 2 Physical Quantity Measurement Section 3. Control Unit 4 Control section 5 Display section 6 Memory section 7 Sensor for monitoring material adhesion status 7a~7d Laser rangefinder 8 Guidance Department 9 Moving Part 10 Connection 11 Edge follower 20a~20d Sensors 21 Excitation section 91 Cart 92 Handle 93a~93d Wheels 101 Arm 102 cylinders 111 Arm 112 Lifting member 113 Contact member 114 Lifting and fixing part 115 Rotating shaft member 201 Excitation coil 202 Magnetizing yoke 300 steel plate 301 Surface 302 Side 303 Edge

Claims

1. a contact member that comes into contact with a side surface of a plate-shaped measurement object when a surface in the vicinity of an edge of the measurement object is measured by a physical quantity measuring unit that measures a physical quantity of the measurement object; a holding member that holds the contact member so as to keep 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; a measuring jig comprising: a physical quantity measuring unit that measures a physical quantity of a measurement object; a correction unit that corrects the physical quantity measured by the physical quantity measuring unit using a correction formula that indicates a relationship between a distance from the edge of the measurement object and the physical quantity, and the distance from the edge to the physical quantity measuring unit when measured by the physical quantity measuring unit; A measuring device comprising:

2. The measuring device according to claim 1 , wherein the contact member is a disk-shaped rotating body having an outer circumferential surface that contacts the side surface, and is rotatably provided on the holding member via a rotation axis of the rotating body.

3. The measurement device of claim 1 , wherein the contact member comprises a magnet.

4. A contact member that comes into contact with a side surface of a plate-shaped measurement object when a surface in the vicinity of an edge of the measurement object is measured by a physical quantity measuring unit that measures a physical quantity of the measurement object; a holding member that holds the contact member so as to keep 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; a physical quantity measuring step of measuring the physical quantity using a measuring jig comprising: a correction step of correcting the physical quantity measured in the physical quantity measuring step, using a correction formula indicating a relationship between a distance from the edge of the measurement object and the physical quantity, and a distance from the edge to the physical quantity measuring unit at the time of the physical quantity measuring step; A measurement method comprising:

5. A measurement method as described in Claim 4, wherein the contact member is a disk-shaped rotating body having an outer peripheral surface that contacts the side surface, and is rotatably mounted on the holding member via the rotation axis of the rotating body.

6. The measurement method described in claim 4, wherein the contact member is equipped with a magnet.

7. a manufacturing device for manufacturing a plate-shaped product; a measuring device according to any one of claims 1 to 3, which measures a physical quantity of the plate-like product manufactured by the manufacturing device; A plate-shaped product manufacturing facility comprising:

8. a physical quantity measuring step of measuring a physical quantity of a plate-like product by the measurement method according to any one of claims 4 to 6; a quality control step of performing quality control of the plate-like product based on the measurement results of the physical quantities obtained in the physical quantity measurement step; A method for quality control of plate-shaped products, comprising:

9. a manufacturing step of manufacturing a plate-shaped product; a physical quantity measuring step of measuring a physical quantity of the plate-like product manufactured in the manufacturing step by the measurement method according to any one of claims 4 to 6; A method for producing a plate-shaped product comprising:

Images