JPS61135489A - Welding device - Google Patents

Abstract

PURPOSE:To weld plural places simultaneously uniformly and efficiently by fitting plural couples of electrodes movably to the cylinder structure part where respective pressure chamber is communicating to and by giving the mechanism that all electrodes become of projection position at welding time. CONSTITUTION:A piston, cylinder mechanism part is formed by the piston part 31 connecting to an electrode 14, the cylinder chamber 32 where the piston part 31 is fitted freely slidably, the pressure chamber 35 communicating to the cylinder chamber 32, etc. In case of performing a weld a hydraulic pressure is first acted on the pressure chamber 35 and the electrode 14 becomes of a projection position to touch a work W. At this time the pressure force impressed on all electrodes 14 is uniformalized with the minute retreatment of each electrode 14 by the motion of the spring member 51, etc. installed inside a small cylinder chamber 45. The welding strength can be thus uniformalized and the simultaneous welding of the approaching position is enabled due to the press force to be impressed on all electrodes 14 being uniformalized like this.

Description

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

In electric resistance welding, welding equipment that simultaneously welds multiple locations on a workpiece using multiple electrode rods has conventionally had a separate press for advancing and retracting the electrode rods for each electrode rod, and these presses simultaneously It is made to work. However, there was a drawback that the pressing force of the electrode rod against the workpiece was difficult to be uniform over all the electrode rods, resulting in variations in welding strength. Further, when the tip of each electrode rod is worn unevenly, a large difference occurs in the above-mentioned pressing force, resulting in variation in welding strength. Furthermore, it is impossible to arrange multiple electrode rods close to each other, so if the positions on the workpiece to be welded are close together, it is not possible to weld at the same time, resulting in multiple steps of the process. I had to weld it separately.

The present invention solves these conventional problems, and provides a welding method in which the pressing force of all electrode rods against the workpiece is uniform, making the welding strength uniform, and simultaneous welding in close positions possible, improving work efficiency. The purpose is to provide equipment.

Therefore, the present invention is characterized by attaching one side of a plurality of pairs of electrode rods to an electrode rod mounting block in a cylindrical structure so that it can move forward and backward, and attaching the electrode rod mounting block to a movable side mounting portion of a press machine. and/or by attaching it to the fixed side mounting part, making the pressure chambers of each of the above cylinder structure parts in communication, and connecting the fluid supply path to the pressure chambers, and applying fluid pressure to the pressure chambers during welding. All the electrode rods are configured to be pressed to the maximum protruding position, and the pressure chamber is communicated with a small cylinder chamber containing a piston, and the piston is always attached to one side by an elastic member built into the small cylinder chamber. When each electrode rod presses the workpiece W by the operation of the press machine, the piston resists the resilient member due to the fluid pressure of the pressure chamber. The structure is configured such that all the electrode rods are allowed to move back by a minute amount from the maximum protrusion position.

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

FIG. 1 shows a welding device according to the invention.

In the figure, reference numeral 1 denotes a press machine, which is provided with an upright base frame 2 having a movable side attachment part 3 for attaching an upper die and a fixed side attachment part 4 for attaching a lower die.

The movable mounting portion 3 is vertically movable as shown by arrow A by one ram-shaped cylinder 5 vertically mounted on the base frame 2. That is, the attachment part 3 consists of a base plate 6 connected to the cylinder 5, and an electrode plate 8 attached to the lower surface of the cough table plate 6 via an insulating plate 7, and is arranged vertically along a guide rail (not shown). Moving. On the other hand, like the movable side attachment part 3, the fixed side attachment part 4 also consists of a base plate 9 and an electrode plate 11 attached to the upper surface of the cough table plate 9 via an insulating plate 10, and is fixedly attached to the lower side of the base frame 2. has been done.

12 is an upper electrode unit attached to the movable attachment part 3, and includes a metal base 13 and a cough base! It consists of a metal electrode rod mounting block 15 for attaching a plurality of electrode rods 14 to the base plate 113, and a plurality of fixing tools 16 and fixing screws 17 are used at the periphery of the base 13 to attach the electrodes. It is attached to the bottom surface of the plate 8. The electrode rods 14 are attached to a mounting block 15 by a cylinder structure (described later). In addition, in the illustrated example, five electrode rods 14 are shown, and three
Mounting block 15 with a common electrode rod 14.14.14
and the other two electrode rods 1
4.14 is mounted vertically on another mounting block 15.

Reference numeral 19 denotes a lower electrode rod unit attached to the fixed side attachment part 4, which includes a metal base 20, an upper electrode rod 14...
It consists of mounting blocks 22 and 22 for attaching the lower electrode rods 21 . It is attached to the upper surface of the electrode plate 11 by. Note that the lower electrode rod 21 is fixed.

Reference numerals 23 and 23 denote male guide parts erected on the base 20 of the lower electrode rod unit 19, and a fitting member 25 that can be fitted into the female guide parts 24 and 24 of the upper electrode rod unit 12 is attached to the cylindrical body 26. It has an elastic member 27 on the upper part thereof so as to be movable up and down. The male guide part 23 and the female guide part 24 allow the upper and lower electrode rod units (12.19) to be accurately aligned with each other, and the respective electrode plates 8, 11 of both (12.19)
It can also be easily installed.

28 is a power supply unit, 29 is a wiring cable connecting the positive pole of the power supply unit 2B and the electrode plate 8, and 30 is a wiring cable connecting the negative pole of the power supply unit 28 and the electrode plate 11.

Therefore, the electrode rod 14 of the upper electrode rod unit 12...
As shown in FIG. 2 and FIG.
It is slidably fitted into the internal cylinder chamber 32. That is, the electrode rod 14 forms a cylinder structure part 33 together with the mounting block 15, and can move forward and backward by the cylinder structure part 33, and the lower end surface of the piston part 31 comes into contact with the stepped part 34 at the lower end of the cylinder chamber 32. - It is said that untwisting is prohibited. 35 is a pressure chamber that communicates with the cylinder chamber 32, and is formed by a recess 36 on the upper surface of the mounting block 15 and the lower surface of the base 13, and straddles all the cylinder chambers 32 at each mounting protrusion 15.15. The pressure chambers 35.35 of each mounting block 15.15 are connected to the communication pipe 3.
They communicate with each other at 7.

The upper electrode rod 14... is in the piston part 31 in the normal state.
The lower end surface of the electrode rod 21 is in the maximum protruding position in contact with the stepped portion 34 of the cylinder chamber 32, and during welding, fluid pressure acts on the pressure chamber 35.35 through the fluid supply path 38 and is pressed, and the lower electrode rod 21...・Press the upper workpiece W. This fluid supply path 3
The downstream side of the switching valve 39 passes through the base 13 and opens into the hollow portion 40 of each electrode rod 14 .
0 communicates with the pressure chamber 35.35. Specifically, as shown in FIG. 4, the base 13 is provided with a supply hole 41, and the inner wall of each pressure chamber 35, 35 (lower surface of the base 13) is in communication with the supply hole 41 and has each electrode rod. 14...
A pipe 42 . Furthermore, a switching valve 44 is connected to one (right side) pressure chamber 35.
A fluid discharge path 43 having a diameter is formed.

45 is a small cylinder chamber that communicates with the pressure chamber 35.35 through a communication port 46 opened in the other (left side) mounting block 15, and a piston 47 is slidably housed therein. Specifically, as shown in FIG. 5, the small cylinder chamber 45 is formed by attaching a bottomed cylindrical body 48 to the side of the mounting block 15 with a screw connection 49, and the piston 47 is also a bottomed cylindrical body 48. It is housed in the small cylinder chamber 45 with its closed side facing the communication hole 46 side. Furthermore, piston 4
A resilient member 51 such as a compression coil spring is interposed between the bottom wall 50a of the hollow hole 50 of 7 and the inner wall 45a of the closed portion of the small cylinder chamber 45, and the piston 47 is kept in constant communication with the resilient member 51. Normally, the communication port 46 is biased toward the 46 side.
is blocked. Reference numeral 45b is an air vent hole provided through the closed portion of the cylindrical body 48, and allows the piston 47 to move against the resilient member 51. The piston 47 can move until it abuts the inner wall 45a of the closed portion of the small cylinder chamber 45, and in this abutting state, the elastic member 51 moves against the hollow hole 5.
It is stored in a contracted state at 0. 52 is a gasket attached to the piston 47.

As shown in FIG. 4, each of the upper electrode rods 14 has a tip member 53 at the tip that can be detached and replaced by a screw connection 54, and a fixing nut 5 that fixes the tip member 53.
5, the length can be adjusted. Then, the electrode rod 14.
... is connected in the pressure chamber 35 to the inner wall 56 of the pressure chamber 35, that is, the lower surface of the base 13 which is in electrical continuity with the electrode plate 8, by a conductive cable 57, and electricity flows to the electrode rod 14 via the conductive cable 57. It is done like this. One end of the conductive cable 57 is fixed to the upper end surface of the piston portion 31 of the electrode rod 14 with a bolt member 58, and the other end is fixed to the inner wall 56 with a fastener 59 such as a bolt. The bolt member 58 has a through hole 6 having the same diameter as the hollow part 40 of the electrode rod 14.
The pipe 42 has a cylindrical shape with a diameter of 0.0, the male threaded portion 58a is screwed into the female threaded portion 61 at the open end of the hollow portion 40, and the pipe 42 is inserted through the through hole 60. 62 is a gasket attached to the piston portion 31.

Furthermore, the lower electrode rods 21... and the upper electrode rods 14...
Similarly, it has a hollow shape, and a fluid supply path 6 is provided in the hollow portion 63.
A vibro 5 communicating with the hollow portion 63 is loosely inserted, and the tip of the vibro 5 is open at the inner side of the hollow portion 63. Reference numeral 66 represents a fluid discharge path communicating with the hollow portion 63 of each electrode rod 21 .

Next, the case of welding a workpiece W using the welding apparatus configured as described above will be explained using FIGS. 1, 2, and 3. First, in FIG. 1, the movable mounting portion 3 of the press 1 is in the raised position. From this state, the cylinder 5 is operated to lower the movable mounting portion 3. As a result, all the upper electrode rods 14... approach the workpiece W above the lower electrode rods 21.... FIG. 2 shows a state in which the movable mounting part is descending and the upper electrode rod 14 is just before it comes into contact with the workpiece W. Up to this point, the fluid supply path 38 and fluid discharge path 43 have The switching valves 39 and 44 are in the open state, and water flows through the supply channel 38 and the discharge channel 43 as shown by the arrows (see the arrows in FIG. 4). The piston 47 of the small cylinder chamber 45 closes the communication port 46 by the elastic force of the elastic member 51.

Then, before the electrode rods 14 come into contact with the workpiece W, both the switching valves 39 and 44 are switched to the closed state, and the pressure chamber 35°3 is switched to the closed state.
The electrode rod 14... is connected to the workpiece W while water pressure is applied to the electrode 5.
comes into contact with. At this time, the movable side attachment part 3 remains a short distance from the lowest position lowered by the cylinder 5, and as the electrode rod 14 is lowered by a minute amount, the pressure chamber 35.35.
The workpiece W is pushed by the water pressure, and at the same time attempts to retreat through the cylinder chamber 32 against the water pressure.

At this time, the piston 47 of the small cylinder chamber 45 retreats against the elastic force of the elastic member 51 due to the increased water pressure in the pressure chambers 35, 35, allowing the electrode rods 14 to retreat, As shown in FIG. 3, when all the electrode rods 14 are retracted by a minute amount, the piston 47 is pressed against the opposite end of the small cylinder chamber 45. That is, the small cylinder chamber 45 serves to release the increased water pressure in the pressure chambers 35, 35 through the communication port 46 when the electrode rods 14 press the workpiece W.

However, if there is variation in length between each electrode rod 14 due to the degree of wear of the tip member 53 at the tip, installation error, processing error, etc. (for example, as shown in FIGS. 2 and 3) The central electrode rod 14 and the other four electrode rods 14...
Even if there is a difference of dimension l in the length of the tip member 53), the workpiece W is pressed and retreated sequentially starting from the electrode rod 14 with the longest length, and eventually all the electrode rods 14... While in this state (FIG. 3), water pressure acts equally on each electrode rod 14, and the pressing force against the workpiece W becomes uniform over all the electrode rods 14.

Thereafter, in a state where all the electrode rods 14 press the work W, current is applied between them and the lower electrode rod 21 to perform welding.

After welding is completed, the movable side mounting part 3 is raised by the operation of the cylinder 5, and both the switching valves 39 and 44 are switched to the open state, and water flows again as shown in Fig. 2, and each electrode rod 14... Cooling. Further, the piston 47 of the small cylinder chamber 45 is also moved forward by the resilient member 51 to close the communication port 46. From then on,
Welding is performed sequentially by repeating similar steps. Note that the lower electrode rod 21... is connected to the fluid supply path 64-vibro 5
- Hollow part 63 - Cooled by water flowing through fluid discharge path 66.

In the welding apparatus described above, the electrode rods 14 and 21 are efficiently cooled, and the apparatus can be simplified and lowered in cost by using both the pressurizing fluid circuit and the cooling fluid circuit. Further, since the conductive cable 57 of the upper electrode rod I4 is disposed in the pressure chamber 35, the conductive cable 57 is not cooled by water and does not overheat, and its life can be extended.
It does not interfere with the workpiece W or other objects and does not become a hindrance.

Note that the present invention is not limited to the illustrated embodiments,
Of course, you are free to change the design as long as it does not cause a bubble film. 14.21 may be upside down (furthermore, the mounting block 15 may be mounted on the movable mounting portion 3).
It is also free to attach it to both the fixed side attachment part 4 and the fixed side attachment part 4.

The present invention has effectively achieved its intended purpose with the configuration detailed above. In particular, the configuration is such that a plurality of electrode rods 14 are supported in a cylindrical structure, and all electrode rods 14 are pressed to the maximum protruding position by applying fluid pressure to the communicating pressure chamber 35 during welding. At the same time, the pressure chamber 35 is connected to the piston 47.
The maximum protrusion of all the electrode rods 14 is achieved by communicating with the built-in small cylinder chamber 45 and releasing the increased fluid pressure in the pressure chamber 35 due to the pressing of the workpiece W by the electrode rods 14 into the small cylinder chamber 45. Since the structure is configured to allow a minute amount of retreat from the posture, the pressing force applied to the workpiece W by each electrode rod 14 becomes equal, and the welding strength of each part of the workpiece W can be made uniform. In particular, even if the tips of the pair of electrode rods 14, 21 become worn, the same pressing force is always maintained, and there is no change in the pressing force unlike in the conventional fixed electrode rod type. Moreover, it is possible to arrange the electrode rods 14 and 21 at small intervals, and simultaneous welding at close positions is possible.
Welding can be performed with a fast welding cycle, and the work W can be flowed in synchronization with the press cycle of the press process in the previous process. Therefore, there is no need to once suspend the workpiece W during the welding process, and work efficiency can be improved. Further, the electrode rod 14 and its mounting block 15 can be detached and replaced as a whole, and there is an advantage in attaching the electrode bar 14 to a common type of press l.

[Brief explanation of the drawing]

Fig. 1 is a simplified front view of a welding device showing an embodiment of the present invention, Fig. 2 is an enlarged vertical cross-sectional view of the main parts of the welding device showing a state in which the movable side attachment part of the press machine is lowered, and Fig. 3 is a simplified front view of a welding device showing an embodiment of the present invention. Fig. 4 is an enlarged longitudinal sectional view of the main part of the welding device showing the state during welding, Fig. 4 is an enlarged longitudinal sectional view of the main part showing details of the attachment part of the movable electrode rod, and Fig. 5 is an enlarged sectional view of the small cylinder chamber. be. DESCRIPTION OF SYMBOLS 1... Press machine, 3... Movable side attachment part, 4... Fixed side attachment part, 14.21... Electrode rod, 15... Mounting block, 33... Cylinder structure part, 35 ...Pressure chamber, 38...Fluid supply path, 45...Small cylinder chamber,
46...Communication port, 47...Piston, 50...Air introduction path. Patent applicant Takao Metal Industry Co., Ltd. Figure 3 Figure 4

Claims (1)

[Claims] 1. One side of the electrode rods 14 of the plurality of pairs of electrode rods 14, 21, ... is attached to the electrode rod mounting block 15 so that it can move forward and backward in a cylindrical structure, and the electrode rod mounting block 1
5... are attached to the movable side attachment part 3 and/or the fixed side attachment part 4 of the press machine 1, and the pressure chambers 35... of each of the above-mentioned cylinder structure parts 33 are connected to each other, and the pressure chambers 35 are connected to the pressure chambers 35. The fluid supply path 38 is connected to the pressure chamber 35 during welding.
By applying fluid pressure to..., all electrode rods 14...
The pressure chamber 35 is communicated with the small cylinder chamber 45 in which the piston 47 is built, and the piston 47 is constantly pushed by the resilient member 51 built into the small cylinder chamber 45. Pressure chamber 35 is biased toward one side.
When each electrode rod 14... presses the workpiece W by the operation of the press machine 1, the piston 47 is moved by the fluid pressure of the pressure chamber 35... All the electrode rods 14 retreat against the resilient member 51...
A welding device characterized in that the welding device is configured to allow a minute amount of retreat from the maximum protrusion position.