JPS6252673B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention involves pressurizing and clamping an object to be welded between a pair of disk electrodes, and in this state, applying current while rotating the disk electrodes to separate the objects to be welded. This relates to seam welding machines.

Conventional structure and its problems When seam welding the flange of the body of a square or round tube and the top and bottom plates as shown in Figure 1a and b,
Conventionally, an apparatus shown in FIG. 2 has been put into practical use. In FIG. 2, 1 is a tube as an object to be welded, 1a is a body of the tube 1, and 1b is a top and bottom plate of the tube 1. 2a, 2b are disk electrodes, 3 is disk electrode 2a
This is a cylinder for raising and lowering the workpiece and pressurizing the workpiece. 4 is a circular support roller, and 5 is a cylinder for moving the support roller 4 in the horizontal direction.

In this device, one flange of the workpiece is held under pressure between two disk electrodes 2a and 2b, and the other open flange is supported by a support roller 4, while the workpiece is held horizontally. The flange part is seam welded. However, with this device, it is difficult to keep the heights of the disc electrode 2b and the support roller 4 at the same level, and if the height difference becomes large, the welding line may become inclined, or the disc electrodes 2a, 2b may fall off from the flange. and welding cannot be performed. In addition, for large and heavy objects to be welded,
There are problems with the lack of applicability.

Purpose of the Invention The present invention solves these conventional drawbacks, and makes it possible to seam-weld flanges formed by the body and top and bottom plates of pipe bodies of various sizes with a relatively simple mechanism. The purpose is to

Structure of the Invention In order to achieve such an object, the present invention provides a welding device which is arranged horizontally together with a movable disc electrode, and which pressurizes the workpiece to be welded between the movable disc electrode and the movable disc electrode. A fixed disk electrode is provided around the fixed disk electrode so as to be movable up and down, and the object to be welded is carried in and out of the welding area between the fixed disk electrode and the movable disk electrode. A device comprising a plurality of elevating rollers, a fixed roller disposed between the elevating rollers, and a clamp roller that presses the top surface of the workpiece positioned on the fixed rollers to regulate the height. It is.

DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the drawings of FIGS. 3 to 6.

In the figure, 1 is a tube as a welded object, 6 is a fixed disk electrode, 7 is a movable disk electrode, and 8 is a movable disk electrode 7 that is moved to apply welding pressure to the welded object. The pressurizing cylinder 9 is an electrode machine connected to the stationary disk electrode 6 in order to rotate the stationary disk electrode 6. 10 is a lifting roller that can be raised and lowered;
11 is a bracket that supports the lifting roller 10, and 12 is a roller lifting cylinder that moves the lifting roller 10 up and down together with the bracket 11. Reference numeral 13 denotes a fixed roller rotatably supported and disposed in the gap between the lifting rollers 10 and on the left and right sides of the fixed disk electrode 6. In order to distinguish between the fixed roller 13 and the lifting roller 10 in FIG. The fixed roller 13 is shaded. Reference numeral 14 denotes a bracket that supports the fixed roller 13. Reference numeral 15 denotes a positioning roller for positioning the workpiece to be welded, and is rotatably installed at the same position as the contact point of the two fixed and movable disc electrodes 6 and 7. 1
6 is a clamp roller that applies pressure to the top and bottom plates of the workpiece to prevent the workpiece from floating during welding;
17 is a clamp roller mounting plate. 18 is a cylinder that moves the clamp roller 16 up and down, and 19 is a guide that guides the movement of the clamp roller 16. 20 is a support to which the clamp roller 16 and positioning roller 15 are attached, and 21 is the main body of the apparatus.

Next, the operation of each part will be explained. first,
As shown in FIG. 4, the lifting roller 13 is raised (the state shown by the broken line in the figure).
The work to be welded is carried onto the roller, and the positioning roller 1
Press it on 5. When the object to be welded is carried in, the clamp roller 16 is raised and does not interfere with the introduction of the object to be welded. Further, the movable side disc electrode 7 is open. When the object to be welded is set in a predetermined position, the lifting roller 13 is lowered, and the flange portion formed by the top and bottom plates and the body is connected to the two fixed and movable disk electrodes 6 and 7. It is supported in a position where it is held in place. Next, the clamp cylinder 18 operates to lower the clamp roller 16 and pressurize the upper top and bottom plate surfaces of the workpiece. Thereby, it is possible to prevent the object to be welded from lifting up or tilting during welding. When the clamping is completed, the movable disc electrode 7 moves forward, and the two fixed and movable disc electrodes 6 and 7 clamp the workpiece under pressure. The fixed-side and movable-side disc electrodes 6 and 7 are placed in a state where the flange formed by the body of the workpiece and the top and bottom plates is clamped under pressure.
If you apply electricity while rotating the flange, the flange will be seam welded. As welding progresses, the object to be welded changes its position through parallel or rotational movement.
The entire surface of the body end of the object to be welded is supported by lifting rollers 10 and fixed rollers 13, so that it can be easily moved without tilting. FIG. 6 shows how the position of the welded object changes. As shown in the figure, the object to be welded moves and rotates on the rollers. Also, for clarity of illustration, the rollers are shown with lines.

Effects of the Invention According to the seam welding device of the present invention,
It can easily handle pipes of various sizes or very heavy pipes, and there is no need to adjust the level according to the amount of wear of the disc electrode, making it extremely easy to handle. It is. When seam welding the flange portion formed by the body of the tube and the top and bottom plates, this method is very advantageous in terms of versatility, operability, and product quality control.

[Brief explanation of the drawing]

1a and 1b are perspective views and sectional views of essential parts showing an example of the workpiece to be welded, FIG. 2 is a front view showing a conventional seam welding device, and FIGS. A top view, a front view, and a side view showing the seam welding apparatus according to the embodiment, and FIG. 6 are schematic diagrams for explaining the operation of the apparatus. DESCRIPTION OF SYMBOLS 1... Tube body, 6... Fixed side disk electrode, 7... Movable side disk electrode, 10... Lifting roller, 13... Fixed roller, 16... Clamp roller.

Claims (1)

[Claims] 1. A fixed disk electrode which is arranged horizontally together with the movable disk electrode and performs welding by pressurizing the object to be welded between it and the movable disk electrode, and the surroundings of the fixed disk electrode. A plurality of lifting rollers are provided so as to be able to be raised and lowered, and are disposed between the lifting rollers and a plurality of lifting rollers for carrying the workpiece into and out of the welding area between the fixed disk electrode and the movable disk electrode. A seam welding device equipped with a fixed roller and a clamp roller that presses the upper surface of a workpiece positioned on the fixed roller to regulate the height.