JP2630717B2 - Automatic groove inspection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for measuring a groove shape before welding.

[0002]

2. Description of the Related Art Conventionally, measurement of a groove shape has been performed by using a light cutting method. For example, FIG.
050 is a conceptual diagram of the measurement of the surface shape of a groove disclosed in Japanese Patent Application Publication No.
Is irradiated from the laser light source 4, an irradiation line image is captured by the imaging device 5, and the surface shape of the welding base material 1 is estimated from the captured image data. FIG. 10 shows an example of captured image data. The black circles in the figure are image data, and the surface shape of the groove can be estimated by creating auxiliary lines L1, L2, and L3.

[0003]

However, in such conventional groove shape measurement, it was not possible to estimate even the cross-sectional shape of the groove, and thus it was not possible to measure the thickness of the groove or the root face. . The present invention has been made to solve this problem, and an object of the present invention is to provide a device that can estimate the cross-sectional shape of a groove and measure the thickness of the groove and the root face.

[0004]

SUMMARY OF THE INVENTION An automatic groove inspection apparatus according to the present invention comprises: an optical device for irradiating a laser beam to a groove; an imaging device for imaging an irradiation line image of the laser light from the optical device; A surface shape estimating device for estimating the surface shape of the groove from the image data of this imaging device, an ultrasonic thickness gauge for measuring the thickness of the plate near the groove, and a surface shape obtained by the surface shape estimating device And a cross-sectional shape estimating device for synthesizing the cross-sectional shape of the groove portion from the thickness obtained by the ultrasonic thickness gauge.

[0005]

In the present invention, the surface shape of the groove portion is obtained by the optical device, the imaging device and the surface shape estimating device, the thickness of the base material is obtained by the ultrasonic thickness gauge, and the cross-sectional shape is estimated from both data. The cross-sectional shape of the groove is estimated by the device.

[0006]

FIG. 1 is an overall configuration diagram of an automatic groove inspection apparatus showing an embodiment of the present invention. The measurement of the surface shape of the groove is basically the same as the conventional configuration. The laser beam 3 is guided from the laser light source 4 to the groove 2 of the welding base material 1 through the optical fiber 6 and irradiated from the lens assembly 7. , Imaging device 5
Captures the irradiation image. Further, after the image data is binarized by the image processor 8, the image data is transferred to the coordinate calculation device 9 as surface shape data.

The ultrasonic probe 1 of the ultrasonic thickness gauge 10
1 is placed near the groove 2 of the welding base material 1, and the thickness of the welding base material 1 near the groove 2 is measured by an ultrasonic thickness gauge 10,
The thickness is transferred to the coordinate calculation device 9.

The coordinate calculating device 9 calculates the shape coordinates of the groove 2 from the surface shape data and the sheet thickness to estimate the sectional shape of the groove 2. The groove shape calculation device 12
Is for individually calculating a root face, a root gap, a misalignment, a groove angle, and the like from the coordinates calculated by the coordinate calculation device 9.

FIG. 2 is an explanatory diagram of the estimation of the cross-sectional shape by the coordinate calculation device 9. First, the coordinates of the surface shape are calculated from the surface shape data of the welding base materials 1A and 1B, and the solid lines abc and f
-Gh is obtained. Here, the surface shape is a shape formed by abc and fgh that can be recognized from the top surface of the groove portion, and is composed of a groove angle θ, misalignment D, a root gap G, and the like. You. Next, based on the solid lines ab and fg, the respective plate thicknesses T1 and T2 of the welding base metals 1A and 1B are used.
Are obtained at positions having an interval corresponding to
As the bottom surface shape of B, dashed lines de and ij are obtained.
A dash-dot line de from the point c and a dash-dot line i from the point h
-J, drop the perpendiculars to the root faces H1, H
As 2, the broken lines ce and hj are obtained. That is, the cross-sectional shape is a vertical cross-sectional shape of the groove formed by abced and fghhi, and includes a groove angle θ,
It is composed of misalignment D, root gap G, base material plate thicknesses T1, T2, root faces H1, H2, and the like.

FIG. 3 is a schematic perspective view showing the use of the present invention for welding groove inspection of a steel pipe. Here, a circumferential rail 22 is arranged near the welding groove of the steel pipe 21 and the circumferential rail 2
2 is provided with a slider 23 which slides in the circumferential direction of the steel pipe 21 using the rail 22 as a guide. The slider 23 is provided with an arm 24 which can move in parallel with the axial direction of the steel pipe 21. It supports the imaging device 5, the lens assembly 7, and the ultrasonic probe 11 that constitute the unit (the display of other components of the present invention is omitted). FIG. 4 is an overall configuration diagram of FIG. 3, wherein reference numeral 20 denotes an automatic groove inspection device of the present invention represented by a scanning unit and a data processing unit;
3 and a scanning control device for controlling the movement of the arm 24, 26
Is a function to control the automatic inspection device 20 and the scanning control device 25 and to store in the storage device 27 the position coordinates of the steel pipe 21 transferred from the scanning control device 25 and the groove shape data transferred from the automatic inspection device 20. Also have.

If the groove inspection device of the present invention is provided with a white light source 28 as shown in FIG. 5, it can be used with the image pickup device 5 for visual inspection. If the eddy current sensor 29 and the eddy current measuring device 30 are provided as shown in FIG. 6, the position of the vertical seam welded portion 31 such as the steel pipe 21 can be detected.

In addition, the groove inspection device may be provided with a reading mechanism of a stamp stamped on the steel pipe 21. This is because, as shown in FIG. 7, when the lens assembly 7 and the image pickup device 5 are used and a laser beam is applied to the stamped portion (the numeral 2 in the figure) of the steel pipe 21, the image data of the image processing device 8 becomes FIG.
As shown in (a) of FIG.
Since 2 occurs, binarized image processing is performed on this, and further pattern recognition is performed, so that it can be identified as a number or symbol as shown in FIG.

[0013]

As described above, according to the present invention, the surface shape of the groove portion is obtained by the optical device, the imaging device and the surface shape estimating device, and the thickness of the base material is obtained by the ultrasonic thickness gauge. By synthesizing these with the cross-sectional shape estimating device, the cross-sectional shape of the groove can be obtained. Furthermore, the cross-sectional shape data of the groove obtained by this device should be reflected in the welding conditions in the next welding process, and used to set the position of the ultrasonic probe in the ultrasonic inspection test after the completion of welding. This has the effect of ensuring high quality welding.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of a groove inspection device of the present invention.

FIG. 2 is an explanatory diagram of cross-sectional shape estimation by a coordinate calculation device.

FIG. 3 is a schematic perspective view in which the present invention is used for welding groove inspection of a steel pipe.

FIG. 4 is an overall configuration diagram of FIG. 3;

FIG. 5 is a visual inspection mechanism constituting a part of the groove inspection device of the present invention.

FIG. 6 is a vertical seam weld detection mechanism that forms a part of the groove inspection device of the present invention.

FIG. 7 is a stamp reading mechanism that constitutes a part of the groove inspection device of the present invention.

FIG. 8 is an explanatory diagram of the operation of the stamp reading mechanism.

FIG. 9 is a conceptual diagram of a conventional groove surface shape measurement.

FIG. 10 is an example of image data captured by an imaging device.

[Description of Signs] 1 Welding base material 2 Groove 3 Laser light 4 Laser light source 5 Imaging device 6 Optical fiber 7 Lens assembly 8 Image processor 9 Coordinate calculator 10 Ultrasonic thickness gauge 11 Ultrasonic probe 12 Groove Shape calculation device

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical indication location G01B 17/02 G01B 17/02 Z (73) Patent holder 000004123 Nippon Kokan Co., Ltd. Marunouchi, Chiyoda-ku, Tokyo, Japan 1-1-2, 1-2 (72) Koji Ishihara, 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. (72) Takao Miyazaki 1-1-2, Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan stock In-house (72) Inventor Akira Hagiwara 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. (72) Inventor Toyoyoshi Kimura 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. (72 ) Inventor Kazuo Okamoto 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Inside Nippon Kokan Co., Ltd. (72) Inventor Takuo Sato Marunouchi, Chiyoda-ku, Tokyo No. 1-2, Uchi 1 Nippon Kokan Co., Ltd. (56) References JP-A-57-29904 (JP, A) JP-A-53-9145 (JP, A) JP-A-60-49213 (JP, A) JP-A-2-1510 (JP, A) JP-A-52-133050 (JP, A) JP-A-3-258473 (JP, A) JP-A-1-136004 (JP, A) JP-A-49-60946 (JP, A)

Claims (1)

(57) [Claims] An optical device that irradiates a groove with a laser beam, an imaging device that captures an irradiation line image of the laser beam from the optical device, and a surface shape of the groove based on image data of the imaging device. A surface shape estimating device for estimating, an ultrasonic thickness gage for measuring the thickness of the groove near the groove, and an opening based on the surface shape obtained by the surface shape estimating device and the thickness obtained by the ultrasonic thickness gage. An automatic groove inspection device comprising: a cross-sectional shape estimating device that synthesizes a cross-sectional shape of a tip portion.