WO2020059202A1

WO2020059202A1 - Method for detecting shape of joint part of joining member, and method and device for managing quality of joining member by using same

Info

Publication number: WO2020059202A1
Application number: PCT/JP2019/019115
Authority: WO
Inventors: 徹家成; 康弘桜田; 朝田　博; 泰之紀; 晃生榎原
Original assignee: 日鉄日新製鋼株式会社
Priority date: 2018-09-19
Filing date: 2019-05-14
Publication date: 2020-03-26
Also published as: JP7198450B2; JP2020046302A; TW202030455A

Abstract

Provided is a method which is capable of accurately detecting information about the shape, which is necessary and sufficient for determining the quality of a joint part of a joining member. According to the present invention, shape coordinate data is obtained by scanning a joint part (12) of a joining member (10) with a non-contact means (14) and deploying the scanned result on a two-dimensional plane. A coordinate point (A) of a minimum value in a Z-axis direction of the shape coordinate data (L) is searched for, and, on the basis thereof, a first selection point (B) and a second selection point (C) are selected from a profile of a second member (10b), and a third selection point (D) and a fourth selection point (E) are selected from a profile of a first member (10a). A second member side approximate straight line (α) including the first selection point (B) and the second selection point (C), a first member side approximate straight line (β) including the third selection point(D) and the fourth selection point (D), and the coordinates of an intersection point (F) thereof are calculated. Around deviation portions of the second member side approximate straight line (α) or the first member side approximate straight line (β), from the shape of the shape coordinate data (L), a determination criterion straight line (J), which does not intersect with the shape coordinate data (L), is provided, and the minimum distance (T) between the determination criterion straight line and the shape coordinate data (L) is adopted as an index for expressing the shape of the joint part (12).

Description

Method of detecting shape of joint of joint member, method of quality control of joint member using the same, and apparatus therefor

The present invention relates to a method for detecting the shape of a joint of a joining member, a method for quality control of a joining member using the same, and an apparatus therefor.

接合 A typical example of the joining member in which the end of the second member is butted against the first member and joined is a welded steel such as an H-beam or a T-beam. In this welded steel, a butt portion (T-shaped joint portion) in which the width direction end faces of the web material as the second member are butted in a T-shape is joined to the surface of the flange material as the first member ( The joint is formed and completed by generally welding in the case of metal. If a welding defect such as poor penetration occurs at the time of this welding, a correctly shaped back bead cannot be formed. For this reason, the shape of the butted portion of the welded steel (particularly the shape on the side where the back bead is formed) is used as an index for judging welding quality.

Conventionally, the shape of the butted part of a welded steel was judged by visual inspection, but as a method of efficiently detecting the shape of the welded part of the steel, the surface of the steel using a non-contact optical sensor etc. A method of measuring the profile of the welding portion and processing the profile data to detect the shape of the welded portion has been performed. In such a method, when processing profile data, if there is an abnormality in the shape of a welded portion, a processing method is set on the assumption that there is a considerably sharp change in the gradient from a smooth shape. However, even in the case where the profile of the shape of the welded portion changes smoothly and even if a sudden change in the gradient is not recognized as compared with the other portions, there are cases where poor welding has occurred. This has not been recognized, and a situation has arisen in which a defective product cannot be determined as a defective product.

Therefore, as a technique capable of solving such a problem, for example, Japanese Patent Application Laid-Open Publication No. H11-163873 discloses a technique such as damage or wear using a video inspection device including an image sensor such as a CCD, a probe electronic circuit, and a central processing unit. Methods and devices for automatically identifying points of interest (e.g., deepest or highest) on the surface of a display object having anomalies are disclosed. Specifically, an image of the surface of the display target having an abnormality (target surface) is acquired using the image sensor of the video inspection device, and is displayed on the monitor. Subsequently, three-dimensional data is generated from the image acquired using the central processing unit, and three-dimensional coordinates of a plurality of surface points on the target surface of the display object including the abnormal surface point are determined. Subsequently, the central processing unit is used to determine a reference surface including a plurality of reference surface points close to the abnormality on the display object, and to determine a region of interest which is abnormally close based on the reference surface points of the reference surface. . Then, the central processing unit is used to determine the distance from each of the plurality of surface points in the region of interest to the reference surface, and by determining the surface point farthest from the reference surface, the position of the deepest or highest surface in the region of interest is determined. Is determined.
According to such a method, it is not necessary for the user to manually specify the point of interest on the surface of the abnormality, so that the time for performing the measurement can be reduced and the measurement accuracy can be improved.

JP 2016-80674 A

However, the techniques described in the above patent documents have the following problems.
That is, in the method disclosed in Patent Document 1 described above, a method of automatically identifying a point of interest on the surface of a display object having an abnormality such as damage or wear, generates three-dimensional data of an image acquired by an image sensor. Determination of three-dimensional coordinates of a plurality of surface points on the target surface of the display object, determination of a reference surface including a plurality of reference surface points that are abnormally close, determination of a region of interest that is close to the abnormality based on the reference surface points of the reference surface A large amount of data processing such as determination, determination of the deepest or highest surface position in the region of interest, etc. must be performed, and a high-speed data processing device and a complicated mechanism are required to increase the processing speed of such a method. .
In addition, if the surface of the display object has an irregular shape, the reference surface may deviate from the actual surface shape depending on how the reference surface points are taken, and an error may occur in the position of the deepest or highest surface in the region of interest or its distance. May also occur.

Therefore, a main object of the present invention is to provide a bonding member capable of accurately detecting information on a shape necessary and sufficient for judging the quality of a bonding portion of the bonding member without requiring a high-speed data processing device or a complicated mechanism. An object of the present invention is to provide a method for detecting a shape of a joint. Further, a further object of the present invention is to provide a quality control method and apparatus for a joining member capable of reliably finding a defective product in which a shape abnormality exceeding a quality standard has occurred in a joint using such a shape detection method. And to provide.

In order to achieve the above object, the first invention of the present invention provides, for example, as shown in FIGS. 1 to 8, an end of a second member (10b) protrudes from a first member (10a). The method for detecting the shape of the joint (12) of the joined members (10) joined together was constructed as follows.
The shape of the joint portion (12) of the joint member (10) is specified by the shape coordinate data L obtained by scanning the non-contact means 14, including the joint portion (12) developed on a two-dimensional plane. Detection is performed based on the shape coordinate data L of the detection range.
With respect to the shape coordinate data L, a coordinate point A of the minimum value in the Z-axis direction in the specific detection range is searched, and the coordinate point A of the minimum value is referred to from the profile of the second member (10b). Each coordinate of the first selection point B and the second selection point C is selected, and each coordinate of the third selection point D and the fourth selection point E is selected from the profile of the first member (10a).
An approximate straight line (α) on the side of the second member including the above-described first selection point B and the above-mentioned second selection point C, and a second line including the above-mentioned third selection point D and the above-mentioned fourth selection point E Calculate the approximate straight line (β) on the side of the one member, and calculate the coordinates of the intersection F of the approximate straight line (α) on the side of the second member and the approximate straight line (β) on the side of the first member. calculate.
Then, in the vicinity of a divergence between the approximate straight line (α) on the side of the second member or the approximate straight line (β) on the side of the first member and the shape of the shape coordinate data L, the shape coordinate is provided. A determination reference straight line J that does not intersect with the data L is provided, a minimum distance T between the determination reference straight line J and the above-described shape coordinate data L is calculated, and the minimum distance T expresses the shape of the above-described joint (12). Used as an index.

Here, regarding the “minimum value in the Z-axis direction” in the present invention, the “Z-axis” refers to the profile of the first member (10a) of the shape coordinate data L in the specific detection range developed on the two-dimensional plane. When the shape coordinate data L is arranged such that the profile of the second member (10b) is bilaterally symmetric, the direction axis indicates the vertical direction, and the “minimum value” is the axis direction of the Z axis. A coordinate position (value) on the shape coordinate data L located farthest from the non-contact means 14 that outputs the shape coordinate data L (see FIGS. 1, 2 and 5).

The first invention has, for example, the following effects.
As data necessary for shape determination of the joint (12), in addition to the shape coordinate data L, the approximate straight line (α) on the side of the second member and the approximate straight line (β ) And the coordinate data of the determination reference straight line J that does not intersect with the shape coordinate data L, and do not perform complicated image processing-like calculations. Therefore, a high-speed data processing device and a complicated mechanism are not required.
In addition, since the judgment reference straight line J is offset from the shape coordinate data L, whether the shape of the abutting portion 12 is convex or concave, the judgment reference straight line J and the shape coordinate data L are determined only on one side of the judgment reference straight line J. It is only necessary to search for a point on the shape coordinate data L at which the distance to is shortest, which is very simple.

The present invention includes the following configuration.
That is, the coordinate point A of the minimum value in the Z-axis direction in the shape coordinate data L is on the approximate straight line (α) on the side of the second member or on the approximate straight line (β) on the side of the first member. In some cases, the judgment reference line J includes the intersection point F, and is between each of the approximate line (α) on the side of the second member and the approximate line (β) on the side of the first member. Are provided so as to make the angles formed by.
"When the coordinate point A of the minimum value in the Z-axis direction in the shape coordinate data L is on the approximate straight line (α) on the second member side or on the approximate straight line (β) on the first member side" In the case where the flesh of the joint (12) protrudes beyond the ideal outline formed by the approximate straight line (α) on the second member side and the approximate straight line (β) on the first member side, Correspondingly, in such a case, the determination reference straight line J includes the intersection point F, and is between each of the approximate straight line (α) on the side of the second member and the approximate straight line (β) on the side of the first member. It is provided so that the angles formed are equal.
Also, the coordinate point A of the minimum value in the Z-axis direction in the shape coordinate data L is on the approximate straight line (α) on the side of the second member or on the approximate straight line (β) on the side of the first member. If not, the determination reference straight line J is provided so as to be parallel to the approximate straight line (α) on the side of the second member.
"When the coordinate point A of the minimum value in the Z-axis direction in the shape coordinate data L is not on the approximate straight line (α) on the second member side or on the approximate straight line (β) on the first member side" In the joint portion (12), the thickness is depressed from the ideal outer shape line, and this corresponds to the case where the joint portion (12) does not protrude from the ideal outer shape line. , So as to be parallel to the approximate straight line (α) on the side of the second member.

Further, in the present invention, "the joining member (10) in which the end of the second member (10b) is butted and joined to the first member (10a)" is referred to as "the web member with respect to the flange material." It is preferable that the ends of the material are butt-welded and welded section steels, and the "joining portion (12)" is a welded "butting portion".
In this case, in particular, in the field of welded steel which is considered to have a high need for use of the present invention, it is possible to accurately detect information on the shape necessary and sufficient for judging the quality of the butted portion of the welded steel.

The second invention according to the present invention is a quality control method for the joining member (10) using the shape detecting method for the joining portion (12) of the joining member (10) according to the first invention, wherein the "minimum distance T Is compared with a predetermined threshold value to determine the quality of the shape of the bonding portion (12) of the bonding member (10) after bonding. "
According to the present invention, when determining the quality of the shape of the bonded portion (12) after bonding, the quality can be determined by comparison with a set threshold value, so that the quality of the shape can be detected very simply and accurately.

The "joining member quality control apparatus" of the third invention in the present invention is an apparatus for implementing the method of the second invention, and for example, as shown in FIGS. The quality control device of (1) is configured as follows.
The fan-shaped light is applied to the specific detection area including the joint (12) of the joining member (10), which is formed by joining the end of the second member (10b) to the first member (10a). Non-contact means 14 for scanning shape light and generating and outputting shape coordinate data L reflecting a change in the position or shape of the above-mentioned joint (12) based on reflected light of the irradiated or scanned light. Have.
With respect to the shape coordinate data L obtained by the non-contact means 14, a minimum coordinate A in the Z-axis direction in the specific detection range is searched, and the second member is referred to based on the minimum coordinate A. The respective coordinates of the first selection point B and the second selection point C are selected from the profile of (10b), and the third selection point D and the fourth selection point E are selected from the profile of the first member (10a). Each coordinate is selected, and an approximate straight line (α) on the side of the second member including the first selection point B and the second selection point C, the third selection point D, and the fourth selection point While calculating the approximate straight line (β) on the side of the first member including the point E, the approximate straight line (α) on the side of the second member and the approximate straight line (β) on the side of the first member are calculated. Is calculated, and the approximate straight line (α) on the side of the second member or the approximate straight line (β) on the side of the first member is calculated. A determination reference straight line J that does not intersect with the shape coordinate data L is provided in the vicinity of a divergence from the shape of the shape coordinate data L, and a minimum distance T between the determination reference straight line J and the shape coordinate data L is calculated. By comparing the minimum distance T obtained by the judgment reference straight line calculation / processing unit 16b and the judgment reference straight line calculation / processing unit 16b with a predetermined threshold value, the joining unit ( The arithmetic processing unit 16 is composed of the determination processing unit 16c that determines the quality of the shape after joining in 12).

ADVANTAGE OF THE INVENTION According to this invention, the shape of the joining part of the joining member which can detect the information regarding the shape sufficient for the quality judgment of the joining part of the joining member with sufficient accuracy without requiring a high-speed data processing apparatus and a complicated mechanism It is possible to provide a quality control method and a device for a bonding member capable of reliably finding a defective product having a shape abnormality exceeding a quality standard at a bonding portion by using a detection method and such a shape detection method. it can.

It is a schematic diagram showing an example of a device configuration example of a quality control device for a joining member (welded section steel) according to the present invention. It is the schematic which expanded the principal part of FIG. FIG. 2 is a block diagram illustrating a configuration example of an arithmetic processing unit in the quality control device for the joining member (welded section steel) according to the present invention. It is a flowchart which shows an example of the quality control method of the joining member (welded steel) of this invention. FIG. 4 is an image diagram of shape coordinate data in the shape detection method of a joint (butting portion) of a joining member (welded steel) according to the present invention. FIG. 4 is a diagram illustrating a shape detection image by an algorithm for confirming a shape of a butt portion in a method of detecting a shape of a joint portion (butt portion) of a joint member (welded section steel) according to the present invention. Shape detection image diagram of the joining part (butting part) in the quality control method of the joining part (butting part) of the joining member (welded section steel) of the present invention (shape detection image diagram in the second member (web material) In the case of "no dripping"). Shape detection image diagram of the joining part (butting part) in the quality control method of the joining part (butting part) of the joining member (welded section steel) of the present invention (shape detection image diagram in the second member (web material) This is the case with "dripping"). It is explanatory drawing which shows an example of the welded steel to which the quality control method of the joining member (welded steel) of the present invention is applied. According to the quality control method of the joint (butting portion) of the joining member (welded section steel) of the present invention, the end of the second member (web material) projects at an acute angle with respect to the first member (flange material). FIG. 11 is a conceptual diagram of a shape detection when applied to a joined joint (butting portion) (in a case where the second member (web material) has no “droop”). According to the quality control method of the joint (butting portion) of the joining member (welded section steel) of the present invention, the end of the second member (web material) projects at an obtuse angle with respect to the first member (flange material). FIG. 10 is a conceptual diagram of shape detection when applied to a joined portion (butting portion) (in a case where “sagging” is present in a second member (web material)).

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
In the present embodiment, in order to facilitate understanding of the invention, a welded steel section is taken as a specific example of the joining member, and "the end of the second member is abutted against the first member and joined. As a specific example of the “connected portion of the joined member”, a description will be given of a “butt portion of a welded steel shape formed by welding an end of a web material to a flange material and welding”.
FIG. 1 is a schematic diagram showing an example of a device configuration of a quality control device for welded steel according to the present invention. As shown in this figure, the quality control device for welded steel according to one embodiment of the present invention includes a non-contact means 14 and an arithmetic processing unit 16.

The non-contact means 14 converts the coordinate data (= shape coordinate data L) of the surface shape of the butted portion 12 of the welded steel 10 to which the end of the web material 10b is vertically butted against the flange material 10a and welded. In the present embodiment, a non-contact type displacement meter configured with a light projecting device (not shown) and a data output device corresponds to this device.
Reference numeral 14C in FIG. 1 is a control unit that controls the operation and the like of the non-contact means 14 in accordance with a command transmitted via the arithmetic processing device 16 described later.

光 The light projecting device is a device that irradiates a fan-shaped light or scans a spot-shaped light to a specific detection range (see FIG. 2) centered on the welded butted portion 12 of the welded steel section 10. Specifically, a light source using a slit light source in which light emitted from a light emitting element such as a laser or a lamp is linearly converged by a cylindrical lens or the like, or light that converges in a point shape at an irradiation position by a mirror or the like. An example using a scanning point light source that scans in a direction (X-axis direction) orthogonal to the butted portion 12 of the welded steel 10 can be exemplified. Here, the “direction (X-axis direction) perpendicular to the butting portion 12” refers to the direction in which the flange material 10 a passes through the butting portion 12 (the end of the web material 10 b abuts against the flange material 10 a). The direction perpendicular to the axis H equidistant from each surface of the web material 10b and also perpendicular to the axial direction (longitudinal direction = Y-axis direction) of the welded steel 10 (see FIGS. 1 and 2). .

The data output device receives the reflected light of the light radiated from the light projecting device toward the above-described specific detection range, and the shape coordinates reflecting the change in the position and shape of the butting portion 12 based on the reflected light. This device outputs data L, which is a shape coordinate data L obtained by developing a shape of a specific detection range centered on the abutting portion 12 on a two-dimensional plane. Specifically, it is composed of a 2D Ernostar lens, a CMOS image sensor, a microprocessor, and the like, and forms an image on the light receiving element of the CMOS image sensor by reflecting light diffusely reflected on the surface of the butted portion 12 of the welded steel 10. This is a device that detects a change in position and shape and generates shape coordinate data L representing the change in position and shape. In the non-contact means 14 including this data output device, the generation of the shape coordinate data L is continuously performed in the longitudinal direction (Y-axis direction) of the welded steel 10.
The shape coordinate data L generated by the data output device is provided to the arithmetic processing device 16 via the wiring 15.

In the welded steel quality control device according to the present invention, the Z-axis direction is a direction orthogonal to both the X-axis and the Y-axis (see FIGS. 1 and 2). When the shape coordinate data L is arranged such that the profile of the flange material 10a and the profile of the web material 10b of the shape coordinate data L developed on the two-dimensional plane are bilaterally symmetric, Become.

In the embodiment of FIG. 1, the welded steel 10 is an H-shaped steel, and a pair of butted portions 12 are formed at both ends of the web material 10b. Although the case where the non-contact means 14 is connected is shown, for example, when the welded section steel 10 is a T-section steel, the number of the non-contact means 14 connected to the quality control device may be one. Further, if necessary, three or more non-contact means 14 may be provided in the quality control device.

The arithmetic processing unit 16 is provided on a computer (not shown) and decodes an instruction to perform an arithmetic operation. As shown in FIG. 3, the data processing unit 16a includes a data buffer unit 16a, a criterion straight line arithmetic / processing unit 16b, The processing unit 16c, the display processing unit 16d, and the event occurrence signal output unit 16e are configured on a general-purpose operating system 16x such as Windows (registered trademark) or Linux (registered trademark).

(Data buffer unit 16a)
The data buffer unit 16a is a storage device that temporarily stores the shape coordinate data L of the butted portion 12 of the welded steel 10 continuously provided from the non-contact means 14.

(Judgment reference straight line / processing unit 16b)
The determination reference straight line / processing unit 16b performs the following operation on the above-described shape coordinate data L provided from the data buffer unit 16a.
That is, the coordinate point A of the minimum value in the Z-axis direction in the specific detection range centering on the shape of the butting portion 12 is searched for the shape coordinate data L (see FIG. 5), and the coordinate point A of the minimum value is determined. The respective coordinates of the first selection point B and the second selection point C are selected from the profile of the web material 10b as a reference, and the respective coordinates of the third selection point D and the fourth selection point E are selected from the profile of the flange material 10a. Select (see FIG. 6).
Subsequently, a web-side approximate straight line α including the first selected point B and the second selected point C and a flange-side approximate straight line β including the third selected point D and the fourth selected point E are described. And the coordinates of the intersection F of the web-side approximate straight line α and the flange-side approximate straight line β are calculated (see FIG. 6).
In addition, a determination reference straight line J that does not intersect with the shape coordinate data L is provided near the divergence between the web-side approximate straight line α or the flange-side approximate straight line β and the shape of the shape coordinate data L. The minimum distance T from the shape coordinate data L is calculated.
In this specification, for example, “selecting the coordinates of the first selection point B” means that the first selection point B is selected on the two-dimensional coordinate plane including the X axis and the Z axis as shown in FIG. Determining the X and Z coordinates.

Here, as the determination reference straight line J (which does not intersect with the shape coordinate data L), one of the following two is selected according to the shape of the butting portion 12.
First, as shown in FIG. 6 and FIG. 7, a case where the welded portion in the butt portion 12 protrudes beyond an ideal outline formed by the web-side approximate straight line α and the flange-side approximate straight line β. . In this case, the coordinate point A of the minimum value in the Z-axis direction in the shape coordinate data L exists on the web-side approximate straight line α or the flange-side approximate straight line β.
As shown in FIG. 7, the determination reference straight line J selected in such a case includes the intersection point F and is provided such that the angles formed between the web-side approximate straight line α and the flange-side approximate straight line β are equal. (That is, a straight line substantially parallel to the X axis in the case of the embodiment of FIG. 7).

The second case is, as shown in FIG. 8, where the welded portion of the butt portion 12 is recessed from the ideal outer shape line, and the butt portion 12 does not protrude from the ideal outer shape line. In this case, the coordinate A of the minimum value in the Z-axis direction in the shape coordinate data L does not exist on the web-side approximate straight line α or the flange-side approximate straight line β.
As shown in FIG. 8, the determination reference line J selected in such a case is provided so as to be parallel to the web-side approximate straight line α, in other words, the web-side approximate straight line α intersects the shape coordinate data L. It is translated so that it does not. For this reason, unlike the first case, the coordinate point G closest to the determination reference line J on the shape coordinate data L may not coincide with the minimum coordinate point A in the Z-axis direction. .
In addition, the reason why the welded portion is depressed from the ideal outer shape line in the butted portion 12 is that the web material 10b has a “sag” at the widthwise end of the web material 10b when the web material 10b is abutted against the flange material 10a. This may occur when the material 10b is butted against the flange material 10a. This “sag” appears in FIG. 8 in a portion where the shape coordinate data L deviates from the web-side approximate curve α and is curved from the point C to the point F via the point G.
Incidentally, the "dripping" at the width direction end of the web material 10b means cutting conditions such as a state of a slitter blade and a method of applying the slitter blade when the steel material is cut by a slitter or the like to manufacture the web material 10b. As a result, an undesired cutting stress is applied to the width direction end of the web material 10b, and the end face is dragged toward the direction in which the stress is applied and plastically deforms as if dripping.

The criterion straight line / processing unit 16b uses the obtained minimum distance T (between the criterion straight line J and the shape coordinate data L) as an index expressing the shape of the abutting unit 12, and uses the determination processing unit 16c and the display process. To the unit 16d.
The display processing unit 16d receives not only the information on the minimum distance T but also the shape coordinate data L, each selected point, the web-side approximate straight line α, and the flange-side approximate straight line β as shown in FIGS. , The intersection F and the determination reference line J are also provided from the determination reference line / processing unit 16b.

(Determination processing unit 16c)
The determination processing unit 16c determines whether or not the shape of the butted portion 12 of the welded steel shape 10 is good by comparing the deviation referred to as the minimum distance T calculated by the determination reference straight line / processing unit 16b with a predetermined threshold value. It is.
When the deviation (minimum distance T) is equal to or exceeds the threshold as shown in FIGS. 7 and 8, for example, as shown in FIGS. If it is less than, it is determined that the defective product is not sufficiently welded, and the signal is given to the display processing unit 16d and the event occurrence signal output unit 16e.

(Display processing unit 16d)
The display processing unit 16d is connected to a display device 18 such as a monitor via the wiring 17, and converts the data given from the determination reference straight line / processing unit 16b and the determination processing unit 16c so that the display device 18 can display the data. Is what you do. In the present embodiment, a touch panel display is used as the display device 18, and the display device 18 also has a function as a man-machine interface (HMI) for issuing various instructions to the arithmetic processing device 16.

(Event occurrence signal output unit 16e)
The event occurrence signal output unit 16e is connected to an external system 20 such as a rotation warning light or an alarm buzzer via a wiring 19, and determines whether the butted portion 12 of the welded steel 10 is judged by the judgment processing unit 16c. A predetermined event occurrence signal is given to the external system 20 based on the result of the failure determination. For example, when the quality of the butting unit 12 is determined to be defective by the determination processing unit 16c, the event occurrence signal output unit 16e sends an external warning signal such as a rotation warning light or an alarm buzzer to notify the operator of the occurrence of a defective product. An event occurrence signal is generated such that the system 20 operates.

Next, when the quality control of the butt portion 12 of the welded steel 10 is performed using the quality control device for the welded steel 10 configured as described above, the present invention is applied as shown in the flow chart of FIG. The method for detecting the shape of the butted portion 12 of the welded steel 10 and the quality control method using the same are executed in this order.

That is, in step S1 of FIG. 4, by scanning the non-contact means 14, the shape coordinate data L of a specific detection range centered on the butted portion 12 of the welded steel 10 is acquired in a form developed on a two-dimensional plane. The data is supplied to the data buffer unit 16a of the arithmetic processing unit 16 via the wiring 15.
Subsequently, in step S2 in FIG. 4, the above-described shape coordinate data L is provided from the data buffer unit 16a to the determination reference straight line / processing unit 16b, and the specific detection centering on the shape of the butting unit 12 is performed as described above. The minimum coordinate point A in the Z-axis direction in the range is searched, and based on the minimum coordinate point A, the first selection point B and the second selection point C are selected from the profile of the web material 10b, A third selection point D and a fourth selection point E are selected from the profile of 10a (see FIG. 6). Thereafter, a web-side approximation straight line α including the first selection point B and the second selection point C and a flange-side approximation straight line β including the third selection point D and the fourth selection point E are calculated, and the web-side approximation is calculated. The coordinates of the intersection F between the straight line α and the flange side approximate straight line β are calculated (see FIG. 6). A determination reference straight line J that does not intersect with the shape coordinate data L is provided in the vicinity of the divergence between the web-side approximate straight line α or the flange-side approximate straight line β near the intersection F and the shape of the shape coordinate data L. The minimum distance T between the determination reference straight line J and the shape coordinate data L is calculated, and these data are given to the determination processing unit 16c as an index representing the shape of the abutting unit 12.

Then, in step S3 in FIG. 4, the judgment processing unit 16c compares the minimum distance T between the judgment reference straight line J and the shape coordinate data L with a predetermined threshold value as described above, and The quality of the shape of the fitting unit 12 is determined. If the shape of the butt portion 12 is good, the OK process for determining that the product is a good product is performed in step S4. Conversely, if the shape of the butt portion 12 is bad, the process proceeds to step S5. NG processing for determining that the product is defective, specifically, as described above, the external system 20 such as a rotation warning light and a warning buzzer is operated from the event occurrence signal output unit 16e to notify the operator of the occurrence of the defective product. Such an event occurrence signal is issued.

Here, in an actual welding section steel production line equipped with a laser welding machine, quality control is performed when producing an H-section steel having a height of 150 mm x a width of 100 mm x a web thickness of 2.3 mm x a flange thickness of 3.2 mm x a length of 8600 mm. As the device, a commercially available high-precision two-dimensional laser displacement meter is used for the non-contact means 14 according to the present invention, and the threshold value when there is no “sag” at the end of the web material is 40 μm. The operation was performed with a threshold value of 600 μm (provided that the parallel movement distance between the web-side approximate straight line α and the determination reference straight line J was 1 mm) when “sagging” occurred. As a result, the defect detection rate was 0.07% for 1343 inspections. Since defective products could be extracted by using the quality control device of the present invention in the inspection process of the welding section steel production line, the number of defective products outflow was 0 and the defective product outflow rate was 0.00%.

In the embodiment described above, the non-contact means 14 uses a light projecting device. However, the non-contact means 14 has a surface shape of the welded butt portion 12 of the welded section steel 10. Any mode can be used as long as coordinate data (that is, shape coordinate data L) can be obtained, and an ultrasonic generator, a radar, or the like may be used instead of the light projecting device.

Further, the welding method and the shape of the welding section steel to which the method and apparatus of the present invention are applied are not particularly limited, and for example, any welding method such as high frequency, arc, plasma, laser, etc. It may be. Further, the method and the apparatus of the present invention can be used, for example, in addition to the laser welded steel shown in FIG. 9A, the lightweight welded steel shown in FIG. 9B, and the build H-shaped steel shown in FIG. , (D), the shape of the butted portion 12 can be detected. Although not a welded steel, the shape can be detected also for the fillet portion indicated by reference numeral 13 of the rolled H-beam shown in FIG. 9E.

In addition, as in the illustrated embodiment described above, the welded section steel 10 is not limited to the one in which the ends of the web material 10b are vertically butted against the flange material 10a and are welded. As shown in FIG. 11, the method of the present invention can be applied to a welded steel section in which the end of the web material 10b is abutted at an acute angle with respect to the flange material 10a, or a welded steel section abutted at an obtuse angle. Apparatus can be applied.

Furthermore, in the above-described embodiment, the case where the specific detection range is centered on the butting portion 12 is shown, but the specific detection range may be any mode as long as the specific detecting range includes the butting portion 12. And the present invention is not limited to the scope of the above embodiment.

Further, in each of the above-described embodiments, the welded steel member 10 has been described as a specific example of the joint member (10). However, the joint member (10) is not limited to the welded steel member 10, For example, a member in which a synthetic resin material such as FRP or CFRP is joined may be used, and in this case, the members may be joined by a method using an adhesive or a method using heat fusion.

10: welded steel (joining member), 10a: flange material (first member), 10b: web material (second member), 12: butted portion (joined portion), 14: non-contact means, 16: Arithmetic processing unit, 16b: determination reference straight line calculation / processing unit, 16c: determination processing unit, A: coordinate point of the minimum value in the Z-axis direction (in a specific detection range), B: first selection point, C: second selection Point, D: third selection point, E: fourth selection point, F: (web-side approximate straight line (approximate straight line on the second member side) and flange-side approximate straight line (approximate straight line on the first member side) J: Judgment reference straight line, L: Shape coordinate data, T: Minimum distance (between the judgment reference straight line and shape coordinate data), α: Web-side approximate straight line (approximate straight line on the second member side) , Β: approximate straight line on the flange side (approximate straight line on the side of the first member).

Claims

The non-contact means (14) scans the shape of the joint (12) of the joint member (10) in which the end of the second member (10b) is butted against the first member (10a). The joining member (10) which is detected based on the shape coordinate data (L) of the specific detection range including the above-mentioned joining portion (12), which is the shape coordinate data (L) obtained by performing A method for detecting the shape of the joint (12),
With respect to the shape coordinate data (L), the minimum coordinate point (A) in the Z-axis direction in the specific detection range is searched, and the second member ( The coordinates of the first selected point (B) and the second selected point (C) are selected from the profile of 10b), and the third selected point (D) and the fourth selected point (D) are selected from the profile of the first member (10a). Select each coordinate of the selection point (E),
An approximate straight line (α) on the side of the second member including the first selection point (B) and the second selection point (C), the third selection point (D), and the fourth selection point The approximate straight line (β) on the side of the first member including the point (E) is calculated, and the approximate straight line (α) on the side of the second member and the approximate straight line (β ) And the coordinates of the intersection (F) are calculated,
Near the divergence between the approximate straight line (α) on the side of the second member or the approximate straight line (β) on the side of the first member and the shape of the shape coordinate data (L), the shape coordinates A judgment reference straight line (J) that does not intersect with the data (L) is provided, and a minimum distance (T) between the judgment reference straight line (J) and the shape coordinate data (L) is calculated. A method for detecting the shape of a joint of a joining member, wherein the method is used as an index representing the shape of the joint (12).
The method for detecting the shape of a joint of a joining member according to claim 1,
The coordinate point (A) of the minimum value in the Z-axis direction in the shape coordinate data (L) is on the approximate line (α) on the side of the second member or the approximate line (β) on the side of the first member. When it is above, the criterion straight line (J) includes the intersection (F), and the approximate straight line (α) on the side of the second member and the approximate straight line (β ) Is provided so as to be equal in angle to each other.
The method for detecting the shape of a joint of a joining member according to claim 1,
The coordinate point (A) of the minimum value in the Z-axis direction in the shape coordinate data (L) is on the approximate line (α) on the side of the second member or the approximate line (β) on the side of the first member. If not, the determination reference straight line (J) is provided so as to be parallel to the approximate straight line (α) on the side of the second member, .
The method for detecting the shape of a joint of a joining member according to any one of claims 1 to 3,
The joining member (10) in which the end of the second member (10b) is butted and joined to the first member (10a), the end of the web material is opposed to the flange material. A welded section steel welded together
A method for detecting a shape of a joint of a joint member, wherein the joint (12) is a welded butted portion.
A quality control method for a joint member using the shape detection method for a joint portion of the joint member according to any one of claims 1 to 4,
By comparing the minimum distance (T) with a predetermined threshold value, the quality of the shape of the bonding portion (12) in the bonding member (12) after bonding is determined. Management method.
The fan-shaped light is applied to the specific detection area including the joint (12) of the joining member (10), which is formed by joining the end of the second member (10b) to the first member (10a). A non-contact method of scanning shape light and generating and outputting shape coordinate data (L) reflecting a change in the position or shape of the abutting portion (12) based on reflected light of the irradiated or scanned light. Means (14);
With respect to the shape coordinate data (L) obtained by the non-contact means (14), a coordinate point (A) of the minimum value in the Z-axis direction in the specific detection range is searched, and a coordinate point (M) of the minimum value is searched. The respective coordinates of the first selected point (B) and the second selected point (C) are selected from the profile of the web material (10b) on the basis of A), and the third coordinate is selected from the profile of the flange material (10a). The respective coordinates of the selection point (D) and the fourth selection point (E) are selected, and an approximation on the side of the second member including the first selection point (B) and the second selection point (C) is performed. Calculating an approximate straight line (β) on the side of the first member including the straight line (α) and the third selected point (D) and the fourth selected point (E); The coordinates of the intersection (F) of the approximate straight line (α) on the side of the first member and the approximate straight line (β) on the side of the first member are calculated, and the approximate straight line (α) on the side of the second member or the first member is calculated. Of the member A determination reference straight line (J) that does not intersect with the shape coordinate data (L) is provided near a divergence between the approximate straight line (β) and the shape of the shape coordinate data (L). J) obtained by the criterion line calculation / processing unit (16b) for calculating the minimum distance (T) between the shape coordinate data (L) and the criterion line calculation / processing unit (16b). An arithmetic processing unit (16c) having a determination processing unit (16c) for determining whether the shape of the bonding portion (12) of the bonding member (10) after bonding is good by comparing the minimum distance (T) with a predetermined threshold value; 16) The quality control device for a joining member, comprising: