JPS609589A - Welding device - Google Patents

Abstract

PURPOSE:To obtain a weld condition uniform over the entire weld zone by providing welding electrodes to the top ends of piston rods fitted to plural cylinders which are communicated and connected with each other so that the plural electrodes can be uniformly pressed to an object to be welded. CONSTITUTION:Plural pieces of cylinder chambers 2 are proviced in parallel to a block body 1 connected to a press 12. Pistons 8 provided with piston rods 9 are fitted freely slidably to the chamber 2. Said rods 9 are projected from the body 1 and the plural chambers 2 are communicated and connected with each other by a communicationg passage 3. Electrode parts 13 are connected to the top ends of the rods 9 and respective welding electrodes 15 are pressed uniformly to an object 19 to be welded. The weld condition uniform over the entire weld zone is thus obtd.

Description

[Detailed description of the invention] The present invention relates to a welding device.

In electric resistance welding, conventional welding equipment that has multiple electrodes and welds multiple locations on a welded object at the same time has a separate press for advancing and retracting the electrode for each electrode. , these presses are designed to operate simultaneously. In this way, the welding electrodes of each electrode part are pressed against the workpiece by individual presses, so it is difficult to obtain an even pressing force, and if each welding electrode is worn unevenly, There is a large difference in the pressing force, and as a result, the welding conditions at all welded locations are not the same, causing problems such as variations in welding strength. Furthermore, since the spacing between each electrode part is limited by the press, it cannot be made smaller than a predetermined spacing, and there is a drawback that simultaneous welding cannot be performed if the pinches between welding positions are close to each other.

The present invention solves these conventional problems by making it possible to equalize the pressing force of a plurality of welding electrodes against the object to be welded, to obtain the same welding condition as a whole, and to reduce the distance between the electrode parts. It is an object of the present invention to provide a welding device that can be made small and can simultaneously weld the entire object even if the welding positions of objects to be welded are close to each other.

Therefore, the feature of the present invention is that a block body connected to a press and movable back and forth is provided with a plurality of cylinder chambers so that their axes are parallel to each other, and a piston rod equipped with a piston rod is provided in the cylinder chambers. Fit the piston so that it can slide freely,
The piston rod is made to protrude from the block body, the plurality of cylinder chambers are connected to each other through a communication passage, and an electrode portion is connected to the tip of the piston rod,
The structure is configured so that the pressing force of each welding electrode on the object to be welded is equal.

Hereinafter, the present invention will be explained in detail based on drawings showing examples.

In FIGS. 1 and 2, 1 is a rectangular block body, and a plurality of cylinder chambers 2 (in the illustrated example, 4 cylinder chambers 2 are provided on the lower surface side).
book) is recessed. The axes of these cylinder chambers 2 are parallel to each other, and they are connected to each other through a communication passage 3. The communication path 3 is formed by a plurality of blind holes 4 provided from two mutually perpendicular side surfaces of the block body 1 toward the opposite side surfaces. That is, from both sides, two blind holes 4 whose centers coincide with the upper wall 5 of the cylinder chamber 2 are provided, and these blind holes 4 are connected to the two cylinder chambers 2 and 2, respectively. It's hanging on. However, since the two blind holes 4 from both sides communicate at the orthogonal part, each cylinder chamber 2 is connected to these blind holes 4.
They are communicated and connected through a communication path 3 formed by . 6...
8 is a blind plug that is screwed into a threaded portion 7 formed in the opening of each blind hole 4, and 8 is a piston rod 9 that is slidably fitted into each cylinder chamber 2 from below. with a piston,
The piston rod 9 projects downward from the block body 1. 10 is a sealing material attached to the piston 8, 1
Reference numeral 1 denotes a cover member attached to the lower surface of the block body 1 with fixing devices such as screws (not shown), and 12 denotes a press to which the center portion of the upper surface of the block body 1 is connected. move it.

Thus, an electrode section 13 is connected to each piston rod 9.... This electrode section 13 consists of a vertically elongated holder 14 and a welding electrode 15 detachably attached to the lower end surface of the holder 14. It is connected to 9 by an unillustrated connection means such as screw engagement.

In addition, 18 is a mating electrode, 19 is a welded object consisting of a plate-like object 20 and small members such as a nut 21 to be welded to the plate-like object 20, and a block body is attached in accordance with the welding position. A cylinder chamber 2... is formed in the cylinder 1. Reference numeral 22 denotes an energizing cable connected to the boulder 14 of the electrode section 13 and the mating electrode.

Therefore, a fluid 23 such as oil is sealed in the communication path 3,
The inside of the communication path 3 is maintained at a predetermined pressure.

Therefore, when the press 12 is operated and the block body 1 is lowered, each electrode part 13... is also lowered at the same time, and the welding electrodes 15... at the tips are brought into contact with the upper surface of the nut 21, which is the object to be welded 19. While pressing the object to be welded 19 with the mating electrode 18, the electrode part 13, that is, the welding electrode 15 and the mating electrode 18
Electricity is applied between them to weld the nut 21 and the plate-shaped object 2o.

This state is shown in FIG. Here, even if the dimensions between each welding electrode 15 and the object to be welded 19 differ due to installation errors or differences in wear of the welding electrode 15, or dimensional errors of the object to be welded 19, etc., each cylinder chamber 2 Since the fluid pressure is applied evenly to the piston 8 of ..., the different dimensions are absorbed by the cylinder chamber 2 and transferred to the other cylinder chambers 2... A pressing force is applied. Therefore, the welding conditions of all welded parts are the same, and welds of the same strength can be obtained.

FIG. 4 shows another embodiment, in which a plurality of cylinder devices 25 are attached vertically and parallel to each other on the lower surface of a support 24 connected to a press 12, and each cylinder device The upper cylinder chamber 26 of 25... is connected to the communication part 2
7..., and the electrode portion 13 is connected to each piston rod 28. In this case as well, the same effect as described above can be obtained.

The present invention has achieved the intended purpose to the greatest extent possible with the configuration described in detail above. That is, a block body 1 connected to a press 12 and movable back and forth is provided with a plurality of cylinder chambers 2 so that their axes are parallel to each other, and piston rods 9 are installed in the cylinder chambers 2. A piston rod 9 is made to protrude from the block body 1 by slidably fitting the attached piston 8, and the plurality of cylinder chambers 2 are connected to each other through the communication passage 3. Furthermore, since the electrode part 13 is connected to the tip of the piston rod 9, each electrode part 13...Due to differences in wear of the welding electrode 15 at the tip, each welding electrode 1
Even if the dimensions between 5... and the object to be welded 19 are different, the pressure in each cylinder chamber 2... is balanced by the fluid 23 during pressing, and each welding part of the object to be welded 19 has an equal weld. Can be pressed with force. Therefore, it is possible to obtain the same welding condition over all the welded parts, and it is also possible to eliminate variations in welding strength. Furthermore, one press 12 can produce multiple electrode parts 13 and
In order to move forward and backward, a large number of electrode parts 13 can be attached to the block body 1, and each electrode part 13.
... can be made small without being restricted by the press 12, and even if the welding positions of the objects 19 to be welded are close to each other, it is possible to weld all the welding positions at the same time, and workability can be improved.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a welding device showing one embodiment of the present invention;
Figure 2 is a plan view of the same, Figure 3 is a longitudinal sectional view showing the operating state,
FIG. 4 is a simplified vertical sectional view of a welding device showing another embodiment. DESCRIPTION OF SYMBOLS 1... Block body, 2... Cylinder chamber, 3... Communication path, 8... Piston, 9... Piston rod, 1
2... Press, 13... Electrode portion, 15... Welding electrode, 19... Welded object. Patent applicant: Takao Metal Industry Co., Ltd. Figure 1 Figure 2 b/4 lb'/ Figure 3 ~ -18201B it 2 Figure 4

Claims (1)

[Claims] 1. A block body l connected to a press 12 and movable back and forth is provided with a plurality of cylinder chambers 2 so that their axes are parallel to each other, and a piston rod 9 is installed in the cylinder chambers 2. A piston 8 attached thereto is slidably fitted to make the piston rod 9 protrude from the block body l, and the plurality of cylinder chambers 2 are connected to each other through the communication passage 3, Furthermore, the welding device is characterized in that an electrode portion 13 is connected to the tip of the piston rod 9 so that the pressing force of each welding electrode 15 against the object 19 to be welded is equalized.