JPS6219418Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a steel plate butt groove condition monitoring device.
In particular, the present invention relates to a groove condition device that enables remote observation of processed parts such as butt laser welded parts of steel plates.

For butt welding of thin steel plates (strips),
Usually, TIG or MIG welding is used, but recently laser welding has been adopted because it produces clean joints with less thermal distortion.
In this laser welding method, the beam spot diameter is very small and the base material is only melted within the narrow range.
Bridges are easily formed even on thin steel plates with a thickness of 0.4 mm or less, allowing for sufficiently clean welding.

By the way, in this laser welding method, since the beam spot diameter is very small as described above, high butt accuracy is required for the butt portions of the steel plate members. If this butt precision is poor, this together with the small diameter of the beam spot will result in poor welding, and problems such as plate breakage will occur during sheet passing in the next process, which is not preferable. For this reason, it is necessary to constantly monitor the butt state of the steel plates, and work for this purpose is performed before or during welding.

Traditionally, this type of work involves investigating the level of butt accuracy and making adjustments when a welding defect occurs during welding, but currently this is done manually using a feeler gauge or visual inspection. be. Furthermore, since this work is done online, there are safety issues.Furthermore, when performing visual observation, the upper part of the steel plate is bright, so observation must be done from the bottom side, which poses problems in work efficiency. It also has In addition, in determining the quality of welding, the actual situation is to directly visually check the welded part in order to determine the quality and color of reflected light. Even in this case, the welding situation must always be viewed directly, and although the eyes are protected by wearing safety goggles, this cannot be said to be sufficient for safety as the work is carried out near the line. . Furthermore, even after welding is completed, we visually check the finished condition, such as the weld bead width and the presence or absence of blowholes, to make a final judgment as to whether or not the plate can be threaded, but this is also a manual process. However, reliability was not sufficient and there were problems with work efficiency.

As described above, the conventional work of checking butt welds on steel plates has not only problems in work safety but also problems in work efficiency.

Focusing on the above-mentioned conventional problems, the present invention makes it easy to grasp the butt groove condition of steel plates and incidentally the welding situation during welding or before and after welding. An object of the present invention is to provide a butt groove condition monitoring device.

In order to achieve the above object, a steel plate butt bevel condition monitoring device according to the present invention is integrally attached to a laser torch that is movable along a weld line formed by butting steel plates to each other, and images the weld line. Cameras to be photographed are arranged on both sides of the steel plate, and a back light means is installed on the opposite side of the steel plate so as to be movable between an irradiation position of the weld line and a retreat position away from the weld line. The welding line leakage light from the back light means placed at the line irradiation position is configured to be detectable by the camera, and the processing part can be observed from a position away from online, thereby improving work safety and efficiency. It also aims to improve the reliability of confirmation work.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the steel plate butt groove condition monitoring device according to the present invention will be described in detail below with reference to the drawings.

The device according to this embodiment has an entry side clamp 1 and an exit side clamp 2, which clamp a leading steel plate 3 and a trailing steel plate 4, respectively, so that the ends of both steel plates 3 and 4 can be butted against each other. . Also, both clamps 1 and 2
Prior to the butting operation, a double cut shear 5 for cutting the ends of the steel plates 3 and 4 can be moved in and out between the clamps 1 and 2. This double cut shear 5 is composed of an upper blade 6 and a lower blade 7, and the upper blade 6 descends to cut the ends of the steel plates 3 and 4. Then, the clamps 1 and 2 move the cut surfaces of the steel plates 3 and 4 to abut against each other, thereby forming a weld line. On the other hand, clamps 1 and 2
A guide rail 8 is provided on the upper surface side of the steel plates 3 and 4 which are butted against each other, and is arranged parallel to the weld line. A torch truck 9 is movably mounted on the guide rail 8, and is movable by a motor (not shown). A laser torch 10 is attached to such a torch truck 9 in order to irradiate a laser beam along the welding line of the steel plates 3 and 4. This torch 10 consists of a cylindrical body 14 containing beam benders 11, 12 and a condensing lens 13, and is configured to irradiate a laser beam with a focus on the abutting portion. Therefore, a laser beam is irradiated from one end side of the butt part to move the torch truck 9 along the guide rail 8.
By moving the leading steel plate 3 and the trailing steel plate 4, the leading steel plate 3 and the trailing steel plate 4 are butt-welded.

In such a device, especially in this embodiment,
A camera 15 is attached to the torch truck 9 along with the laser torch 10, and a back light means 16 is provided on the opposite side of the steel plates 3 and 4, that is, on the back side.
It has the following. The camera 15 uses the weld line, which is the abutting portion of the steel plates 3 and 4, as an image subject, and is set so that its optical axis is parallel to the laser torch 10. And this camera 1
The image No. 5 is projected onto a receiver (not shown) provided on the operation room side away from the line. On the other hand, the back light means 16 has a swing arm 18 rotatably supported by a shaft 17 on the lower surface side of the entry side clamp 1, and a light 19 is attached to the rotating tip side of the swing arm 18. This light 19 is a long one that extends along the abutment between the steel plates 3 and 4, and is movable directly below the abutment by rotation of the swing arm 18. The movement of this swing arm 18 is performed by a cylinder 20 connected thereto, and this cylinder 20 is connected to the entrance side clamp 1.
It is attached to a support stand 21 via a bracket 22. Therefore, the light 19 can be moved in and out of the lower surface of the butt as required by driving the cylinder 20.

The device configured in this manner operates as follows. That is, when the leading steel plate 3 and the trailing steel plate 4 stop at a predetermined position, the entry side clamp 1 and the exit side clamp 2 clamp each steel plate 3, 4, and then the ends of the steel plates 3, 4 are held by the double cut shear 5. disconnected. (Figure 1). After the shear 5 is retracted, the entrance clamp 1 is moved forward to abut the steel plates 3 and 4 against each other. At this time, when checking the butting accuracy of the steel plates 3 and 4, as shown in Fig.
0 is driven to move the light 19 directly below the abutting part, and then the torch truck 9 is run without irradiating the laser beam. At this time, steel plates 3 and 4
The weld line, which is the butt line, is captured by the camera 15, and it is displayed on an image to confirm the gap.

If there is a gap in the butt due to this operation, it will appear as a bright line in the image,
The amount of gap also depends on the amount of light, so it can be confirmed reliably.

After checking the butt accuracy in this way, the laser torch 10 is moved by the cart 9, and the laser beam is irradiated onto the welding line to perform welding (second
figure). Even during this welding, the camera 15 is operated to photograph the welding situation and the bead shape after welding, so that the welding situation can be observed off-line.

As described above, according to this embodiment, the camera 15 is mounted on the torch truck 9, and it is possible to check the accuracy of the butt part before welding and to check the weld part and bead shape during welding, and this can be observed off-line. Therefore, the dangers associated with conventional confirmation work can be avoided. Furthermore, since the nature of the camera 15 allows for magnification, work accuracy can be improved.
Another advantage is that not only the butt condition but also the welding condition and the presence or absence of beads and blowholes after welding can be continuously observed. Furthermore, since the light 19 makes the gap at the abutting portion appear as a bright line, the presence of the gap can be easily recognized, and the amount of the gap can also be easily confirmed.

In the above embodiment, the camera 15 is connected to the torch truck 9.
However, the same effect can be obtained by installing a wide-angle camera on the top of clamps 1 and 2. Furthermore, the positions of the camera and backlight means are not limited to the embodiments. Furthermore, although the above embodiment describes the case where the end of the steel plate is cut by double cut shear, it can also be applied to the case where the end of the steel plate is cut by a laser beam and then welded by the laser beam, instead of such mechanical cutting. It is.

As explained above, according to the steel plate butt groove condition monitoring device according to the present invention, the groove condition of the butt part of steel plates or the welded part can be observed safely and with high precision, and the camera is integrated with the laser torch. Because it can be moved vertically, it is possible to observe a wide range regardless of the width of the steel plate, and because the back light means is attached so that it can be retracted, the backing metal can be easily attached and removed during welding work. The space can be used effectively, and the possibility of damaging the backlight means due to welding sag can be eliminated.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the cutting machine of the steel plate butt bevel condition monitoring device according to this embodiment, Fig. 2 is a front view of the same device during welding, and Fig. 3 is a front view of the same device when checking the butt part. FIG. 4 is a side view of the same device. 1, 2... Clamp, 3, 4... Steel plate, 10...
...Laser torch, 15...Camera, 16...Backlight means, 19...Light, 20...Cylinder.

Claims (1)

[Scope of utility model registration request] A camera that is integrally attached to a laser torch that is movable along a weld line formed by butting the steel plates together and that uses the weld line as an image subject is placed on one side of the steel plate, and a camera is placed on the opposite side of the steel plate. is provided with a back light means movably attached between the weld line irradiation position and a retreat position away from the weld line, and the weld line leakage light from the back light means placed at the weld line irradiation position is detected by the camera. A steel plate butt bevel condition monitoring device characterized by the following features: