JP3105701B2 - Welding member groove shape measurement method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring the shape of a groove in a non-contact manner.

[0002]

2. Description of the Related Art Conventionally, when a shape of an object is obtained by a light cutting method using a laser beam, a slit light source 1 emits a slit light 3 as shown in FIG. The groove 6 is irradiated at a right angle from the vertical direction, and is viewed obliquely from the front with the ITV camera 2, the light cutting line 4 is imaged, taken into an image processing device, and the light cutting line 4 is bent. The cross-sectional shape of the groove was obtained from the image drawn. In this case, in order to accurately obtain the light cutting line, the light intensity and the filter of the slit light, the focus of the ITV camera, the aperture, and the slit light are combined, and the accuracy is expected by fine adjustment by a person.

[0003]

However, when the groove becomes deep or narrow, and the inside of the groove is polished, it is difficult to obtain an accurate light cutting line. this is,
Since the slit light is reflected on the opposite groove wall at the lower portion of the groove, light (virtual image) different from the original image is generated. In particular, since the reflectance is high on the polished surface, it is unnecessary. This is because the image captured by the ITV camera has a problem that a virtual image is formed at the lower part of the groove, and it is difficult to determine where the original light cutting line is. Therefore, it is conceivable to reduce the light intensity of the slit light so that a virtual image cannot be formed. However, in this case, although the virtual image at the bottom of the groove disappears, the intensity of the slit light is reduced in other parts, so that the light cutting line is not continuous with uniform brightness and is interrupted. And it was difficult to obtain an accurate light section line.

[0004] The present invention aims to provide a welding member groove shape measuring how to obtain an accurate light section lines.

[0005]

The present invention that achieves the above object has the following matters specifying the invention. Les Zasuritto light irradiated perpendicularly to the weld line to the welding member, the welding member groove shape measuring method for measuring an open tip profile by receiving an image of the light section line of the groove shape of the weld line by the camera, the shutter The first image of the light cutting line is received by the camera from the oblique front of the welding line through a first imaging optical path composed of a total reflection mirror and a half mirror, and the first image is composed of a shutter, a total reflection mirror and a half mirror. A second image pickup optical path having the same length as the optical path and inverting the image is used to receive a second image of the light cutting line obliquely from the rear of the welding line by a camera, and the first image pickup optical path and the second image pickup. Receiving the first image and the second image by inclining the entire imaging system including the optical path forward or backward with respect to the welding line at a desired angle with the focal position of the light cutting line as a fulcrum. And synthesizes these images to produce light Characterized in that the groove shape of the break was to measure.

[0006]

The light cutting line is captured by two imaging light paths from the front and rear of the welding line, and from one of the light paths, an image in which the light cutting line of the groove is reflected once by one total reflection mirror can be obtained. On the other optical path, an image which is reflected twice and inverted by the two total reflection mirrors is obtained. At this time, the position and the direction angle of the total reflection mirror are set so that the respective optical path lengths become equal. As a result, images of the same size and shape can be obtained for the upper, lower, left and right light cutting lines of the groove captured from the front and rear of the welding line. Furthermore, the position relationship of these imaging systems is maintained as it is, and by tilting the whole several degrees forward or backward with respect to the welding line, the incident angle of the slit light with respect to the groove is inclined, and the front of the welding line is inclined. And the light cutting line of the groove caught from behind, the appearance of the virtual image that occurs at the bottom of each groove,
Images at different positions are obtained. Synthesizing the two images, by the position and size and shape performs image processing for taking out an image only to a common, virtual image is removed, accurate open
The previous light section line is obtained.

[0007]

An embodiment of the present invention will now be described with reference to FIGS. In FIG. 1, the same parts as those in FIG. 3 are denoted by the same reference numerals. That is, 1 is a slit light source, 2 is an ITV
The camera 3 is a slit light. In this case, the slit light 3, laser and which slit light source combined with a focus lens for the cylindrical lens and focusing to emit light in a light beam of a slit strip or the like which is emitted from the laser diode or helium neon laser or the like 1 emits light. Then, the groove 6 of the welding member is irradiated vertically from above at right angles to the welding line, and the light cutting line 4 is obtained. The light cutting line 4 is captured and reflected by the total reflection mirror 8 and the total reflection mirror 10 arranged at the same angle with the slit light 3 as the center from the front and rear of the welding line diagonally. One total reflection mirror 8
Is reflected by the front surface of the half mirror 7 in front of the ITV camera 2 and is captured by the ITV camera 2 arranged in parallel with the slit light source 1. The image reflected by the other total reflection mirror 10 is again reflected by the total reflection mirror 9, inverted, transmitted through the half mirror 7, and picked up by the ITV camera 2. At this time, the positions and orientation angles of the total reflection mirror 8, the total reflection mirror 9, and the total reflection mirror 10 are set so that the optical path distances to the half mirror 7 are equal so that the two images have the same size and shape. When the image is captured into the ITV camera 2, two images are sequentially captured by switching the opening and closing of the shutter 11, and are sent to the image processing apparatus.

Further, the entire image pickup system is moved forward or rearward with respect to the welding line, with the focal point of the light cutting line 4 as a fulcrum.
Since the angle of incidence of the slit light 3 with respect to the groove 6 is tilted by inclining by an angle of several degrees θ, the light cutting line 4 of the groove captured from the front and rear of the welding line is shown in FIGS. 2 (a) and 2 (b). As shown in (1), the appearance and position of the virtual image occurring at the lower part of the groove are different. By performing a logical OR process of combining these two images and extracting only an image having a common position, size, and shape, a virtual image is removed as shown in FIG.
An accurate and clear light cutting line 4 is obtained.

[0009]

As described above, according to the present invention, a virtual image of a target groove is removed, and an accurate and clear light section line of the groove can be obtained. In addition, the non-contact shape inspection of the object can be automatically and accurately performed. Further, in a welding robot or the like, the welding line can be detected and applied to automatic copying.

[Brief description of the drawings]

FIG. 1 is a configuration diagram for explaining a groove measurement method.

FIG. 2 is an explanatory diagram for removing a virtual image.

FIG. 3 is a diagram illustrating an example of a light-section method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Slit light source 2 ITV camera 3 Slit light 4 Light cutting line 5 Subject 6 Groove 7 Half mirror 8 Total reflection mirror 9 Total reflection mirror 10 Total reflection mirror 11 Shutter

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Riki Toyohara 1-1-1, Wadazakicho, Hyogo-ku, Hyogo-ku, Kobe-shi, Hyogo Mitsubishi Heavy Industries, Ltd. Kobe Shipyard (72) Inventor Jiro Matsumoto-Hyogo-ku, Kobe-shi, Hyogo 1-1 1-1 Wadazakicho Mitsubishi Heavy Industries, Ltd. Kobe Shipyard (56) References JP-A-62-245912 (JP, A) JP-A-61-52987 (JP, A) JP-A-2-52172 (JP, A) JP-A-4-41076 (JP, A) JP-A-1-116404 (JP, A) JP-A-62-151073 (JP, U) (58) Fields investigated (Int. Cl. ⁷⁾ , DB name) B23K 9/127

Claims (1)

(57) [Claims] 1. A welding member groove shape for irradiating a laser beam to a welding member at right angles to a welding line, receiving an image of a light cutting line of the groove shape of the welding line with a camera, and measuring the groove shape. In the measurement method, a first image of the light cutting line is received by a camera from a diagonally forward position of a welding line by a first imaging optical path including a shutter, a total reflection mirror, and a half mirror. A second image pickup optical path having the same length as the first image pickup optical path and having an image inverted is used to receive a second image of the light cutting line obliquely from behind the welding line by a camera. The entire image pickup system including the second image pickup optical path is inclined forward or backward with respect to the welding line at a desired angle with the focal position of the light cutting line as a fulcrum, and the first image and the second These images are received Welding member groove shape meter measuring method combining process to be characterized in that so as to measure the groove shape of the optical cutting line.