JP7552642B2 - METHOD FOR MEASURING THE AMOUNT OF BENDING OF METAL MATERIAL AND APPARATUS FOR MEASURING THE AMOUNT OF BENDING OF METAL MATERIAL - Google Patents

Description

The present invention relates to a method for measuring the amount of bending of metal materials and a device for measuring the amount of bending of metal materials.

It is known that, as a metal material, there are steel materials such as shaped steel having a characteristic shape such as angle steel, H-shaped steel, and steel sheet piles, some of which are 20 m or longer in length. When shipping such steel materials, straightness is important. On the other hand, for example, steel materials manufactured by hot rolling are curved, so it is necessary to correct the curve of the steel material, and in order to perform this curve correction, it is important to measure the amount of curvature of the steel material. Patent Document 1 discloses a technology in which multiple laser optical sensors are arranged at arbitrary intervals along the longitudinal direction of a measured object such as a shaped steel near the measured object, and each laser optical sensor irradiates the measured object with laser light, reflects it, and calculates the distance between the multiple laser optical sensors and the measured object based on the reflection time, thereby measuring the curvature of the measured object.

Japanese Unexamined Patent Publication No. 8-189821

However, the technology disclosed in Patent Document 1 leaves room for further study in order to improve the accuracy of measuring the amount of bending of steel material. In addition, since distance measurements are performed simultaneously at multiple positions, it takes time to set the measurement positions. Furthermore, when targeting steel materials of different sizes and shapes, it is necessary to change the distance measurement position for each target according to the steel material shape, etc., which takes time to change the settings and leads to reduced efficiency. In addition, similar issues exist not only for steel materials, but also for other metal materials such as long aluminum materials that have characteristic shape features.

The present invention has been made in consideration of the above problems, and its purpose is to provide a method and device for measuring the amount of bending of metal materials that can improve the measurement accuracy of the amount of bending of metal materials and perform measurements with high efficiency.

In order to solve the above problems and achieve the objective, the method for measuring the amount of bending of a metal material according to the present invention is characterized by comprising a shape feature position measuring process for measuring the positions of shape feature portions at multiple locations in the longitudinal direction of a metal material on which a shape feature portion is placed so that it can be recognized from above, and a bending amount calculation process for calculating the amount of bending of the metal material based on information regarding the measured positions of the multiple shape feature portions.

In addition, in the above invention, the metal material bending amount measuring method according to the present invention includes an irradiation step of irradiating linear light in a width direction perpendicular to the longitudinal direction at multiple locations of the metal material, an imaging step of imaging the entire metal material to include multiple irradiation parts irradiated with the linear light by an imaging device installed in front of or behind the metal material in the longitudinal direction of the metal material and above the metal material, and a width direction position determination step of determining the width direction positions of the shape feature parts belonging to each of the multiple irradiation parts from the image data of each of the multiple irradiation parts that have been imaged, and the bending amount calculation step is characterized in that it calculates the bending amount of the metal material based on the width direction positions of the multiple shape feature parts determined by the shape feature part position measurement step and the longitudinal direction position of the irradiation part to which the shape feature part whose width direction position has been determined belongs.

The metal material bending amount measuring method according to the present invention is characterized in that, in the above invention, the bending amount calculation process includes an actual coordinate calculation process for calculating the actual coordinates of the shape characteristic part based on the width direction position of the shape characteristic part, the longitudinal direction position of the irradiation part to which the shape characteristic part whose width direction position has been determined belongs, and the width direction length of the metal material, and an actual bending amount calculation process for calculating the actual bending amount of the metal material based on the actual coordinates of the shape characteristic part.

The metal material bending amount measuring device according to the present invention is characterized by comprising: a plurality of linear light sources arranged in the longitudinal direction of the metal material, which is placed so that the shape characteristic portion can be recognized from above, and which irradiate linear light in the width direction, which is a direction perpendicular to the longitudinal direction, at a plurality of locations in the longitudinal direction of the metal material; an imaging device that is installed in front of or behind the metal material in the longitudinal direction of the metal material and above the metal material, and which images the entire metal material so as to include a plurality of irradiation portions to which the linear light is irradiated; and a bending amount calculation device that calculates the bending amount of the metal material based on the image captured by the imaging device.

The metal material bending amount measuring device according to the present invention is characterized in that in the above invention, the bending amount calculation device has a feature position calculation unit that calculates the positions of the multiple shape feature parts based on the image, and a bending amount calculation unit that calculates the bending amount of the metal material based on the positions of the multiple shape feature parts.

The metal material bending amount measuring device according to the present invention is characterized in that in the above invention, the characteristic part position calculation unit has a width direction position determination unit that determines the width direction positions of the plurality of shape characteristic parts based on the image, a longitudinal direction position information storage unit that stores information on the longitudinal positions of the plurality of linear lights, and a two-dimensional position calculation unit that calculates the two-dimensional positions in the longitudinal direction and width direction of the plurality of shape characteristic parts.

The method and device for measuring the amount of bending of metal materials according to the present invention have the effect of improving the accuracy of measuring the amount of bending of metal materials and enabling highly efficient measurement.

FIG. 1 is a diagram showing a schematic configuration of a steel material bend amount measuring device according to an embodiment. FIG. 2 is a diagram showing an example of the field of view of a camera in the horizontal direction. FIG. 3 is a diagram showing an example of the field of view of a camera in the vertical direction. FIG. 4 is a block diagram showing a schematic configuration of the arithmetic processing unit. FIG. 5 is a flowchart showing an example of steps of the steel material bend amount measuring method according to the embodiment. FIG. 6 is a flow chart showing an example of a process for measuring the position of a geometric feature. FIG. 7 is a flow chart showing an example of a bending amount calculation process. Fig. 8(a) is a diagram showing an example of an image captured by a camera, Fig. 8(b) is an enlarged view of an irradiated portion to which a first shape characteristic portion belongs, and Fig. 8(c) is an explanatory diagram of a method for identifying pixels of the first shape characteristic portion. FIG. 9 is a diagram showing an example of a method for calculating the actual amount of bending at each shape characteristic portion. FIG. 10 is a diagram showing an example of a method for calculating the actual amount of bending at each shape characteristic portion. FIG. 11 is a graph showing the online test results.

Below, an embodiment of the metal material bending amount measuring method and metal material bending amount measuring device according to the present invention will be described. Note that the present invention is not limited to this embodiment. For example, in this embodiment, a case will be described in which the bending amount of the metal material to be measured is measured while the metal material to be measured is being transported on a transport line using the metal material bending amount measuring method and metal material bending amount measuring device according to the present invention, but the present invention can also be applied to a case in which the bending amount of the metal material to be measured is measured while the metal material is stopped online or offline. Also, in this embodiment, a steel material such as a long steel section will be described as an example of the metal material, but the present invention can also be applied to other metal materials such as a long aluminum material having a shape feature.

Figure 1 is a diagram showing the schematic configuration of a steel bending amount measuring device 1 according to an embodiment. Figure 2 is a diagram showing an example of the field of view FV of the camera 12 in the horizontal direction. Figure 3 is a diagram showing an example of the field of view FV of the camera 12 in the vertical direction.

As shown in FIG. 1, the steel bending amount measuring device 1 according to the embodiment includes a plurality of linear light sources 11a, 11b, 11c, 11d, 11e, 11f, 11g, and 11h, a camera 12 which is an imaging device, and a processor 13.

The steel bending amount measuring device 1 according to the embodiment measures the bending amount of the steel material 2, which is a metal material that is placed and conveyed on a conveying line formed by a plurality of conveying rollers 3 after hot rolling, with the characteristic shape part facing up (the characteristic shape part can be recognized from above). The steel material 2 to be measured for bending by the steel bending amount measuring device 1 according to the embodiment is, for example, a shaped steel having a characteristic shape such as an angle steel, an H-shaped steel, or a steel sheet pile. Here, the case where the bending of an irregular angle steel (NAB) as the steel material 2 is measured by the steel bending amount measuring device 1 according to the embodiment will be described, but the same applies when measuring the bending of other shaped steel such as an H-shaped steel or a steel sheet pile. The characteristic shape part of an irregular angle steel is, for example, a corner (mountain part) formed by connecting the ends of two sides with different lengths at a right angle.

Each of the linear light sources 11a, 11b, 11c, 11d, 11e, 11f, 11g, and 11h is a combination of a line LED light and a condenser lens. The linear light sources 11a, 11b, 11c, 11d, 11e, 11f, 11g, and 11h are each a predetermined measurement area set on the conveying line, located above the steel material 2 conveyed on the conveying line, and arranged at a predetermined interval from the front to the rear in the longitudinal direction of the steel material 2 in the steel material advancement direction. The arrangement intervals of the linear light sources 11a, 11b, 11c, 11d, 11e, 11f, 11g, and 11h can be arbitrarily changed depending on the measurement accuracy and the installation location, but it is preferable that they are equal intervals. In addition, in FIG. 1, eight linear light sources 11a, 11b, 11c, 11d, 11e, 11f, 11g, and 11h are arranged, but this is not limited and it is sufficient to arrange at least three or more.

The multiple linear light sources 11a, 11b, 11c, 11d, 11e, 11f, 11g, and 11h irradiate linear light LLa, LLb, LLc, LLd, LLe, LLf, LLg, and LLh extending in the width direction, which is a direction perpendicular to the longitudinal direction of the steel material 2, from above the steel material 2 transported to a predetermined measurement area set on the transport line toward the steel material 2 so as to include the shape characteristic portion at multiple points in the longitudinal direction of the steel material 2. In other words, the multiple linear light sources 11a, 11b, 11c, 11d, 11e, 11f, 11g, and 11h are installed at positions where they can irradiate linear light LLa, LLb, LLc, LLd, LLe, LLf, LLg, and LLh toward the steel material 2 so as to include the shape characteristic portion.

In the following description, when there is no particular distinction between the multiple linear light sources 11a, 11b, 11c, 11d, 11e, 11f, 11g, and 11h, they are also referred to simply as linear light source 11. When there is no particular distinction between the linear light sources LLa, LLb, LLc, LLd, LLe, LLf, LLg, and LLh, they are also simply referred to as linear light LL.

As shown in FIG. 1, the camera 12 is positioned forward of the longitudinal tip of the steel material 2 in the direction of travel of the steel material and above the steel material 2, relative to the steel material 2 that has been transported to a specified measurement area set on the transport line. The camera 12 is also oriented so that all parts of the steel material 2 in the longitudinal and lateral directions are within the field of view FV.

Here, the steel material 2 to be measured by the steel material bending amount measuring device 1 according to the embodiment is, for example, a shaped steel with a longitudinal length L1 of 6 m to 24 m and a widthwise length of 200 mm to 500 mm. In this case, the installation position of the camera 12 is set to a position where a horizontal angle Φ1 of the field of view FV of the camera 12 can be obtained, as shown in FIG. 2, at a position 5 m (distance L2 in FIG. 2) from the camera center in the longitudinal direction of the steel material 2, a field of view FV of 1 m (width W1 in FIG. 2) in the width direction of the steel material 2 can be secured, and at a position 9 m (distance L3 in FIG. 2) from the camera center in the longitudinal direction of the steel material 2, a field of view FV of 5.8 m (width W2 in FIG. 2) in the width direction of the steel material 2 can be secured.

As shown in Figure 3, the camera 12 is installed so that the viewing angle Φ2 at which the optical axis OX of the camera 12 views the steel material 2 is 86.7° from the vertical direction from the front to the rear of the steel material 2. This ensures a viewing field FV of 29 m (distance L in Figure 3) from the center of the camera in the longitudinal direction of the steel material 2. Note that by inserting a wavelength filter into the camera 12, it is possible to capture only the laser light (reflected light) reflected by multiple irradiation points in the longitudinal direction of the steel material 2.

The camera 12 captures an image of the entire steel material 2, including multiple irradiated areas in the longitudinal direction of the steel material 2 irradiated with linear light LLa, LLb, LLc, LLd, LLe, LLf, LLg, and LLh from multiple linear light sources 11a, 11b, 11c, 11d, 11e, 11f, 11g, and 11h. The image data captured by the camera 12 is transmitted to the processor 13 by wire or wirelessly.

In the steel bending amount measuring device 1 according to the embodiment, the various conditions for the installation position of the camera 12 are changed as appropriate if the size of the steel material 2 to be measured or the viewing angle of the camera 12 is different, and it goes without saying that the specifications of the camera 12 and the installation position of the camera 12 are determined so that at least the entire length and width of the steel material 2 to be measured are included in the viewing field FV of the camera 12. Furthermore, the camera 12 may be placed either above the front or rear in the longitudinal direction of the steel material 2, as long as it can capture an image of the entire steel material 2 including multiple irradiation sections.

The calculation processing device 13 is, for example, a general-purpose computer such as a workstation or a personal computer, and performs calculation processing of the amount of bending of the steel material 2 using the image data received from the camera 12.

Figure 4 is a block diagram showing the schematic configuration of the arithmetic processing device 13. As shown in Figure 4, the arithmetic processing device 13 has a feature position calculation unit 130 and a curve calculation unit 131.

The characteristic part position calculation unit 130 calculates the longitudinal and widthwise positions of the shape characteristic part in the steel material 2 at multiple locations in the longitudinal direction of the steel material 2. The characteristic part position calculation unit 130 also has a widthwise position determination unit 1301, a longitudinal position information storage unit 1302, and a two-dimensional position calculation unit 1303. The widthwise position determination unit 1301 determines the widthwise position of the shape characteristic part in the steel material 2 from an image captured by the camera 12 (image data received from the camera 12). The longitudinal position information storage unit 1302 stores information regarding the longitudinal position of the linear light LL (irradiation unit). The two-dimensional position calculation unit 1303 calculates the two-dimensional longitudinal and widthwise positions of the shape characteristic part in the steel material 2.

The bending calculation unit 131 calculates the amount of bending of the steel material 2 from the position information of multiple shape feature parts calculated by the feature part position calculation unit 130.

Next, we will explain the steel bend amount measurement method according to the embodiment, which is applied to the steel bend amount measurement device 1 according to the embodiment.

Figure 5 is a flowchart showing an example of the process of the method for measuring the amount of bending of steel material according to the embodiment. Figure 6 is a flowchart showing an example of the process for measuring the position of a shape characteristic part. Figure 7 is a flowchart showing an example of the process for calculating the amount of bending.

As shown in FIG. 5, the method for measuring the amount of bending of steel material according to the embodiment includes a shape characteristic part position measurement process and a bending amount calculation process. As shown in FIG. 6, the shape characteristic part position measurement process includes an irradiation process, an imaging process, and a width direction position determination process. As shown in FIG. 7, the bending amount calculation process includes an actual coordinate calculation process and an actual bending amount calculation process. In the method for measuring the amount of bending of steel material according to the embodiment, the shape characteristic part position measurement process is performed, and then the bending amount calculation process is performed to measure the amount of bending of steel material 2.

Specifically, in the steel material bending amount measurement method according to the embodiment, as shown in FIG. 5, first, a shape characteristic part position measurement process is performed (step S1). Next, as shown in FIG. 6, when the calculation processing device 13 starts the shape characteristic part position measurement process, first, an irradiation process is performed in which linear light LLa, LLb, LLc, LLd, LLe, LLf, LLg, and LLh is irradiated from multiple linear light sources 11a, 11b, 11c, 11d, 11e, 11f, 11g, and 11h in the width direction of the steel material 2 at multiple locations in the longitudinal direction of the steel material 2 transported to a predetermined measurement area set on the transport line (step S11). In addition, in this irradiation process, a steel material detection sensor (not shown) detects that the steel material 2 to be measured has been transported to a predetermined measurement area set on the transport line, and a signal indicating the detection is output from the steel material detection sensor to the calculation processing device 13.

The multiple linear light sources 11a, 11b, 11c, 11d, 11e, 11f, 11g, and 11h constantly irradiate linear light LLa, LLb, LLc, LLd, LLe, LLf, LLg, and LLh regardless of whether the steel material 2 has been transported to the specified measurement area, but this is not limited to this. For example, when the steel material detection sensor detects that the steel material 2 has been transported to the specified measurement area, the calculation processing device 13 may irradiate linear light LLa, LLb, LLc, LLd, LLe, LLf, LLg, and LLh from the multiple linear light sources 11a, 11b, 11c, 11d, 11e, 11f, 11g, and 11h.

Next, the arithmetic processing device 13 outputs a trigger signal to the camera 12 at a predetermined timing based on the signal received from the steel detection sensor, and executes an imaging process in which the entire steel material 2 including the multiple irradiation portions is imaged by the camera 12 (step S12). In addition, in this imaging process, image data is transmitted from the camera 12 to the arithmetic processing device 13 by wire or wirelessly, and the image data is stored in a memory unit of the arithmetic processing device 13, for example, in the longitudinal direction position information memory unit 1302.

Next, the calculation processing device 13 executes a width direction position determination process to determine the width direction positions of the shape characteristic parts of the steel material 2 in the multiple irradiated areas based on the image data received from the camera 12 (step S13).

First, as shown in FIG. 8(a), the arithmetic processing device 13 performs a labeling process on the image data received from the camera 12 to recognize a group of adjacent pixels connected together, each of which has color information corresponding to the linear light LL, as a single irradiation section, and extracts a plurality of irradiation sections 31, 32, 33, 34, 35, 36, 37, and 38 that are respectively irradiated by a plurality of linear light sources 11a, 11b, 11c, 11d, 11e, 11f, 11g, and 11h.

The multiple irradiation sections 31, 32, 33, 34, 35, 36, 37, 38 extracted in this way each belong to multiple shape characteristic sections P1, P2, P3, P4, P5, P6, P7, P8. The multiple shape characteristic sections P1, P2, P3, P4, P5, P6, P7, P8 are ordered from 1st to 8th in the longitudinal direction of the steel material 2, from front to rear in the steel material traveling direction.

Next, the arithmetic processing device 13 calculates the minimum pixel that has the minimum value in the v-axis direction for the image data of the extracted irradiated portion, thereby identifying the value in the u-axis direction of that minimum pixel, and determining the widthwise position of the shape characteristic portion belonging to that irradiated portion (position in the widthwise direction of the steel material 2). Here, the pixel position of the irradiated portion of the steel material to be measured irradiated by the linear light source is identified as the horizontal axis u and the vertical axis v (see Figure 8). Here, the origin is the upper left corner point, so in Figure 8, the coordinate system is one in which u increases to the right and v increases to the bottom. This determines the two-dimensional position coordinates of the shape characteristic portion in the v-axis direction (longitudinal direction of the steel material 2) and u-axis direction (widthwise direction of the steel material 2).

8(b) and 8(c), the minimum pixel having the minimum value _v0 in the v-axis direction is calculated based on the image data of the irradiation unit 31 to which the extracted shape characteristic part P1 belongs, and the value _u0 of this minimum pixel in the u-axis direction is specified to determine the width direction position of the shape characteristic part P1 belonging to the irradiation unit 31. This also determines the coordinates (v0 _{, u0} ) of the two-dimensional position of the shape characteristic part P1 in the v-axis direction (longitudinal direction of the steel material 2) and u-axis direction (width direction of the steel material ₂ ).

In this way, the width direction positions of the multiple shape characteristic parts P1, P2, P3, P4, P5, P6, P7, and P8 belonging to each of the multiple irradiation parts 31, 32, 33, 34, 35, 36, 37, and 38 are determined, and the two-dimensional position coordinates of the multiple shape characteristic parts P1, P2, P3, P4, P5, P6, P7, and P8 in the v-axis direction (longitudinal direction of the steel material 2) and u-axis direction (width direction of the steel material 2) are determined. After that, the calculation processing device 13 ends the shape characteristic part position measurement process and executes the bending amount calculation process as shown in FIG. 5 (step S2).

As shown in FIG. 7, when the calculation processing device 13 starts the bending amount calculation process, it first executes an actual coordinate calculation process to calculate the actual coordinates of the shape characteristic part based on the widthwise position of the shape characteristic part, information on the longitudinal position of the irradiation part to which the shape characteristic part belongs, and the widthwise length of the steel material 2 (step S21).

In this actual coordinate calculation process, for example, when the height from the conveying surface formed by the conveying rollers 3 on the conveying line to the camera 12 is A, the distance between the camera 12 and the linear light source 11 in the longitudinal direction of the steel material 2 is B, the horizontal angle of the camera 12 is Φ1 (see FIG. 2), the camera resolution (number of pixels in the u-axis direction) in the width direction (u-axis direction) of the steel material 2 is z, and the coordinate in the width direction of the pixel indicating the shape characteristic part of the steel material 2 (width direction position of the shape characteristic part) is _u0 , the coordinate in the u-axis direction (width direction of the steel material 2) of the pixel indicating the shape characteristic part (the value of u at the position of the minimum value in the v-axis direction of the minimum pixel) in the u-axis direction (width direction of the steel material 2) can be converted to the actual position (actual coordinate) X in the width direction of the steel material 2 in a predetermined measurement area set on the conveying line by the actual position conversion formula expressed by the following formula (1). The actual position (actual coordinate) Y in the longitudinal direction of the steel material 2 of the pixel indicating the shape characteristic part can be converted from the installation position of the linear light source 11.

Next, the calculation processing device 13 executes an actual bending amount calculation process to calculate the actual bending amount at each shape characteristic part based on the calculated actual position (actual coordinates) of each shape characteristic part in the longitudinal direction of the steel material 2 (step S22).

Figure 9 shows an example of how to calculate the actual amount of bending at each shape feature.

In the actual bending amount calculation process, as shown in FIG. 9, for example, the first shape characteristic portion P1 is used as a reference to calculate the angle θ between a straight line LN1 connecting the center of the first shape characteristic portion P1 and the center of the eighth shape characteristic portion P8, and a straight line that passes through the center of the first shape characteristic portion P1 and is parallel to the width direction of the steel material 2. Specifically, the distance in the width direction of the steel material 2 between the center of the first shape characteristic portion P1 and the center of the eighth shape characteristic portion P8 is X, and the distance in the longitudinal direction of the steel material 2 between the center of the first shape characteristic portion P1 and the center of the eighth shape characteristic portion P8 is Y, and the angle θ is calculated using the following formula (2).

After that, using a similar approach, for each of the remaining second to seventh shape characteristic parts P2, P3, P4, P5, P6, and P7 other than the eighth shape characteristic part P8, with respect to the first shape characteristic part P1, the angle θ' between the straight line connecting the first shape characteristic part P1 and the shape characteristic part to be calculated and the straight line passing through the center of the first shape characteristic part P1 and parallel to the width direction of the steel material 2 is calculated. Specifically, the distance in the width direction of the steel material 2 between the center of the first shape characteristic part P1 and the center of the fourth shape characteristic part P4 is X', and the distance in the longitudinal direction of the steel material 2 between the center of the first shape characteristic part P1 and the center of the fourth shape characteristic part P4 is Y', and the angle θ' is calculated using the following formula (3).

After calculating the angle θ' for the second to seventh shape feature portions P2, P3, P4, P5, P6, and P7, the amount of bending r of each of the second to seventh shape feature portions P2, P3, P4, P5, P6, and P7 relative to the first shape feature portion P1 is calculated. The calculated amount of bending r indicates how far the first shape feature portion P1 and the eighth shape feature portion P8 are shifted in the perpendicular direction to the line LN1 connecting the center of the first shape feature portion P1 and the center of the eighth shape feature portion P8, based on the first shape feature portion P1 and the eighth shape feature portion P8, and is the length of the perpendicular line drawn from the center of the shape feature portion to be calculated to the line LN1. Therefore, if the center of a shape feature portion is located on the line LN1, no bending occurs for that shape feature portion, and the amount of bending r is 0.

As shown in FIG. 9, when the center of the shape characteristic part to be calculated is located on the N side, which is the left side in the width direction of the steel material 2 when viewed from the front of the steel material 2, with respect to a straight line B that passes through the center of the first shape characteristic part P1 and is parallel to the longitudinal direction of the steel material 2 as a reference, in other words, when the center of the shape characteristic part to be calculated is located on the N side and the center of the eighth shape characteristic part P8 is located on the S side, the amount of bending r for the shape characteristic part to be calculated is calculated using the following formula (4).

On the other hand, as shown in FIG. 10, when the center of the shape characteristic part to be calculated is located on the S side, which is the right side in the width direction of the steel material 2 when viewed from the front of the steel material 2, with the straight line B as the reference point, in other words, when the center of the shape characteristic part to be calculated is located on the S side and the center of the eighth shape characteristic part P8 is located on the S side, the amount of bending r is calculated for the shape characteristic part to be calculated using the following formula (5).

Then, the arithmetic processing device 13 compares the magnitudes of the calculated actual bending amounts r of the second to seventh shape characteristic portions P2, P3, P4, P5, P6, and P7 to determine the maximum value of the actual bending amount r. The arithmetic processing device 13 then outputs the maximum value of the actual bending amount r as the calculation result of the bending amount of the steel material 2 to a display or the like provided on the arithmetic processing device 13. This causes the arithmetic processing device 13 to end the bending amount calculation process and terminate the series of controls.

As a result, the method for measuring the amount of bending of steel material according to the embodiment and the device 1 for measuring the amount of bending of steel material 2 can improve the measurement accuracy of the amount of bending. Furthermore, since the entire steel material 2 can be imaged and the amount of bending can be measured based on the shape characteristic parts, no major setting changes are required for steel materials 2 of different sizes and shapes, so measurements can be made in a short time, and highly efficient measurements can be achieved without a decrease in efficiency. Furthermore, by applying the method for measuring the amount of bending of metal material and the device for measuring the amount of bending of metal material according to the present invention to other metal materials such as long aluminum materials having shape characteristic parts, the measurement accuracy of the amount of bending can be improved and high efficiency can be achieved.

Next, the inventors of the present application measured the amount of bending of the same steel material 2 using the steel material bending amount measuring device 1 according to the embodiment and the amount of bending manually by an operator for two types of scalene angle steel (NAB) and one type of H-shaped steel with different dimensions as the steel material 2 to be measured. The results are shown in FIG. 11. The two dashed lines shown in FIG. 11 indicate the upper and lower limits of the allowable error between the bending amount measurement result by the steel material bending amount measuring device 1 according to the embodiment and the manual measurement result, with an error of ±6 mm as the target value. The bending amount measurement by the steel material bending amount measuring device 1 according to the embodiment was performed on the steel material 2 being transported online, and the bending amount measurement by the operator was performed on the steel material 2 stopped offline.

As shown in Figure 11, for all steel sections, the error between the bending amount measurement results obtained by the steel bending amount measuring device 1 according to the embodiment and the manual measurement results is generally within the target value, indicating that the bending amount of steel material 2 can be appropriately measured online by the steel bending amount measuring device 1 according to the embodiment.

REFERENCE SIGNS LIST 1 Steel material bending amount measuring device 2 Steel material 3 Conveyor rollers 11a, 11b, 11c, 11d, 11e, 11f, 11g, 11h Linear light source 12 Camera 13 Processing device 31, 32, 33, 34, 35, 36, 37, 38 Irradiation unit 130 Feature part position calculation unit 131 Curve calculation unit 1301 Width direction position determination unit 1302 Longitudinal direction position information storage unit 1303 Two-dimensional position calculation unit

Claims (4)

a shape characteristic portion position measuring step of measuring positions of the shape characteristic portion at a plurality of points in a longitudinal direction of the metal material, the shape characteristic portion being placed on the metal material so that the shape characteristic portion can be recognized from above;
a bending amount calculation step of calculating a bending amount of the metal material based on information regarding the measured positions of the plurality of shape characteristic portions;
having
The shape feature portion position measuring step includes:
an irradiation step of irradiating linear light in a width direction perpendicular to the longitudinal direction of the metal material at a plurality of positions in the longitudinal direction of the metal material;
an imaging step of imaging the entire metal material so as to include a plurality of irradiation portions irradiated with a plurality of the linear light beams by an imaging device installed in front of or behind the metal material in the longitudinal direction of the metal material and above the metal material;
a width direction position determining step of determining width direction positions of the shape characteristic parts that belong to each of the plurality of irradiation parts from image data of each of the plurality of irradiation parts that have been captured;
It has
The bending amount calculation step includes:
an actual coordinate calculation step of calculating actual coordinates of the shape feature parts based on the width direction positions of the plurality of shape feature parts determined in the shape feature part position measurement step, the longitudinal direction positions of the irradiation unit to which the shape feature parts whose width direction positions have been determined belong, and the width direction length of the metal material;
an actual bending amount calculation step of calculating an actual bending amount of the metal material based on the actual coordinates of the shape characteristic portion;
A method for measuring the amount of bending of a metal material, comprising : The metal material is an unequal thickness angle steel,
The shape characteristic portion is a corner portion formed by connecting ends of two sides having different lengths at a right angle.
2. The method for measuring the amount of bending of a metallic material according to claim 1. a plurality of linear light sources arranged in a longitudinal direction, the linear light sources irradiating linear light in a width direction that is a direction perpendicular to the longitudinal direction, at a plurality of locations in the longitudinal direction of the metal material, the metal material being placed so that a shape characteristic portion is recognizable from above;
an imaging device that is installed in front of or behind the metal material in the longitudinal direction of the metal material and above the metal material, and that images the entire metal material so as to include a plurality of irradiation sections to which a plurality of the linear light beams are irradiated;
a bending amount calculation device that calculates a bending amount of the metal material based on the image captured by the imaging device;
Equipped with
The bending amount calculation device is
a feature position calculation unit that calculates positions of the plurality of shape feature portions based on the image;
a bending amount calculation unit that calculates a bending amount of the metal material based on positions of the plurality of shape characteristic portions;
having
The feature portion position calculation unit is
a width direction position determination unit that determines width direction positions of the plurality of shape characteristic features based on the image;
a longitudinal position information storage unit in which information regarding longitudinal positions of the plurality of linear lights is stored;
a two-dimensional position calculation unit that calculates two-dimensional positions in a longitudinal direction and a width direction of the plurality of shape characteristic portions;
It has
the bending amount calculation device calculates actual coordinates of the shape feature parts based on the width direction positions of the plurality of shape feature parts determined by the feature part position calculation unit, the longitudinal direction positions of the irradiation unit to which the shape feature parts whose width direction positions have been determined belong, and the width direction length of the metal material, and calculates an actual amount of bending of the metal material based on the actual coordinates.
1. A metal material bending amount measuring device comprising: The metal material is an unequal thickness angle steel,
The shape characteristic portion is a corner portion formed by connecting ends of two sides having different lengths at a right angle.
4. The metallic material bending amount measuring device according to claim 3.

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