JPH06137853A - Automatic beveling inspection device - Google Patents

Abstract

PURPOSE:To measure the thickness of a beveling as well as root face by obtaining the cross-sectional form of the beveling by an optical device, an image sensing device, and a surface form estimating device, and the plate thickness of a base metal by a ultrasonic 1' plate thickness gauge, and by synthesizing the cross-section form of the beveling from these both data. CONSTITUTION:A laser beam 3 is led from a light source 4 to a beveling 2 of a welding base metal 1 through an optical fiber 6, and applied from a lens assembly 7 to focus an irradiation image by an image sensing device 5. After the image data has been binary-processed in an image processing device 8, it is transferred as a surface form data to a coordinate calculation device 9. Also a ultrasonic probe 11 of a ultrasonic plate thickness gauge 10 is located near the beveling 2 of the welding base metal 1, the plate thickness near the beveling 2 of the welding base metal 1 is measured by the ultrasonic plate thickness gauge 10, and the plate thickness is transferred to the coordinate calculation device 9. In the coordinate calculation device 9, the form coordinate of the beveling 2 is calculated from the surface form data and plate thickness to estimate the cross-section form of the beveling 2.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Conventionally, the measurement of the groove shape has been carried out by utilizing a light cutting method. For example, FIG. 9 shows Japanese Patent Laid-Open No. 52-133.
It is a conceptual diagram of the surface shape measurement of the groove | channel disclosed by the No. 050 publication, Comprising: The laser beam 3 with respect to the groove part 2 of the welding base material 1.
Is irradiated from the laser light source 4, the irradiation line image is captured by the image capturing 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 imaged 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, L3.

[0003]

However, in such a conventional groove shape measurement, the sectional shape of the groove cannot be estimated, and therefore, the thickness of the groove and the root face cannot be measured. . The present invention has been made to solve this problem, and an object of the present invention is to provide an apparatus that can estimate the cross-sectional shape of a groove and measure the thickness of the groove and the root face.

[0004]

An automatic groove inspection apparatus of the present invention is an optical apparatus for irradiating a laser beam to a groove portion, and an image pickup apparatus for picking up an irradiation line image of the laser beam from the optical apparatus. A surface shape estimation device that estimates the surface shape of the groove portion from the imaged data of this imaging device, an ultrasonic plate thickness gauge that measures the plate thickness near the groove portion, and a surface shape obtained by the surface shape estimation device. And a cross-sectional shape estimation device for synthesizing the cross-sectional shape of the groove portion from the plate thickness obtained by the ultrasonic plate thickness gauge.

[0005]

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

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an overall block diagram of an automatic groove inspection apparatus showing an embodiment of the present invention. In principle, the measurement of the surface shape of the groove has the same configuration as that of the conventional one, and the laser light 3 is guided from the laser light source 4 to the groove 2 of the welding base material 1 by the optical fiber 6 and is irradiated from the lens assembly 7. , Imaging device 5
The irradiation line image is captured by. Further, the image data is binarized by the image processor 8 and then transferred to the coordinate calculation device 9 as surface shape data.

Further, the ultrasonic probe 1 of the ultrasonic plate thickness gauge 10
1 is arranged in the vicinity of the groove 2 of the welding base metal 1, and the plate thickness in the vicinity of the groove 2 of the welding base metal 1 is measured by the ultrasonic plate thickness gauge 10.
The plate thickness is transferred to the coordinate calculation device 9.

The coordinate calculation unit 9 estimates the cross-sectional shape of the groove 2 by calculating the shape coordinates of the groove 2 from the surface shape data and the plate thickness. In addition, the groove shape calculation device 12
Is for individually calculating the root face, root gap, misalignment, groove angle, etc. from the coordinates calculated by the coordinate calculation device 9.

FIG. 2 is an explanatory diagram of cross-sectional shape estimation 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 a solid line abc and a solid line fgh are obtained as the surface shape. Next, the solid line a-
b and solid line f-g as a reference, the position which has a space | interval corresponding to each board | plate thickness of welding base material 1A, 1B is calculated | required, and dashed-dotted line d-e and dashed-dotted line i-j are obtained as a bottom face shape. In addition, a perpendicular is drawn from the point c to the dashed-dotted line d-e, and a perpendicular is drawn from the point h to the dashed-dotted line i-j, and a broken line c-e and a dashed line h-j are obtained as root faces. In addition, in FIG.
1 and T2 are plate thicknesses of the welding base metal, θ is a groove angle, D is a misalignment, G is a root gap, and H1 and H2 are root faces.

FIG. 3 is a schematic perspective view of the present invention used for inspection of a weld groove of a steel pipe. Here, the circumferential rail 22 is arranged near the welding groove portion of the steel pipe 21, and the circumferential rail 2
A slider 23, which slides in the circumferential direction of the steel pipe 21 using the rail 22 as a guide, is attached to the slider 2, and the slider 23 is provided with an arm 24 that is movable parallel to the axial direction of the steel pipe 21. The image pickup device 5, the lens assembly 7, and the ultrasonic probe 11 that form a unit are supported (the display of other components of the present invention is omitted). 4 is an overall configuration diagram of FIG. 3, in which 20 is an automatic groove inspection apparatus of the present invention represented by a scanning unit and a data processing unit, and 25 is a slider 2.
A scanning controller for controlling the movement of the arm 3 and the arm 24;
Is a function of controlling the automatic inspection device 20 and the scanning control device 25 and storing 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 in the storage device 27. Also has.

If the groove inspection device of the present invention is provided with the white light source 28 as shown in FIG. 5, the visual inspection can be performed by using it together with the image pickup device 5. Further, as shown in FIG. 6, if the eddy current sensor 29 and the eddy current measuring device 30 are provided, the position of the vertical seam welded portion 31 of the steel pipe 21 or the like can be detected.

In addition, the groove inspection device may be provided with a reading mechanism for markings stamped on the steel pipe 21. As shown in FIG. 7, when the lens assembly 7 and the imaging device 5 are used and a laser beam is applied to the engraved portion (numeral 2 in the figure) of the steel pipe 21, the image data of the image processing device 8 is obtained as shown in FIG.
As shown in (a) of Figure 3, the indentation is made at the location corresponding to the stamped number.
Since 2 is generated, it can be identified as a number or a symbol as shown in (b) by subjecting this to binarized image processing and further performing pattern recognition.

[0013]

As described above, according to the present invention, the surface shape of the groove portion is obtained by the optical device, the image pickup device and the surface shape estimating device, and the plate thickness of the base material is obtained by the ultrasonic plate thickness meter. By combining these with the cross-sectional shape estimation device, it becomes possible to obtain the cross-sectional shape of the groove. In addition, reflect the cross-sectional shape data of the groove obtained by this device in the welding conditions in the next welding process, and use it to set the position of the ultrasonic probe in the ultrasonic flaw detection test after welding is completed. This has the effect of ensuring high quality welding.

[Brief description of 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 of the present invention used for inspection of a weld groove portion of a steel pipe.

FIG. 4 is an overall configuration diagram of FIG.

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

FIG. 6 is a vertical seam welded portion detection mechanism forming a part of the groove inspection device of the present invention.

FIG. 7 is a marking reading mechanism forming a part of the groove inspection device of the present invention.

FIG. 8 is an operation explanatory view of a marking reading mechanism.

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

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Welding base material 2 Groove part 3 Laser light 4 Laser light source 5 Imaging device 6 Optical fiber 7 Lens assembly 8 Image processor 9 Coordinate calculation device 10 Ultrasonic plate thickness gauge 11 Ultrasonic probe 12 Groove shape calculation device

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁵ Identification number Internal reference number FI Technical indication location G01B 17/02 Z (71) Applicant 000000974 Kawasaki Heavy Industries, Ltd. 3 Higashikawasaki-cho, Chuo-ku, Kobe-shi, Hyogo No. 1-1 (71) Applicant 000004123 Nippon Steel Pipe Co., Ltd. 1-2-1, Marunouchi, Chiyoda-ku, Tokyo (72) Inventor Koji Ishihara 1-2-1-2 Marunouchi, Chiyoda-ku, Tokyo 72) Inventor Takao Miyazaki 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Inventor Akira Hagiwara 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Inventor Toyokichi Kimura 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Steel Tube Co., Ltd. (72) Inventor Kazuo Okamoto 1-chome, Marunouchi, Chiyoda-ku, Tokyo No. 1-2 Nihon Steel Pipe Co., Ltd. (72) Inventor Takuo Sato 1-2 1-2 Marunouchi, Chiyoda-ku, Tokyo Nihon Steel Pipe Co., Ltd.

Claims (1)

[Claims] 1. An optical device for irradiating a laser beam to a groove portion, an image pickup device for picking up an irradiation line image of the laser beam from the optical device, and a surface shape of the groove portion based on image pickup data of the image pickup device. A surface shape estimation device for estimating, an ultrasonic plate thickness gauge for measuring the plate thickness in the vicinity of the groove portion, and a surface shape obtained by the surface shape estimation device and the plate thickness obtained by the ultrasonic plate thickness gauge An automatic groove inspection device comprising: a cross-sectional shape estimating device that synthesizes cross-sectional shapes of a tip portion.