JPH0239348B2 - - Google Patents

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 in that the pressing force of the electrode rod against the workpiece was difficult to be uniform across 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.The pressing force of all the electrode rods against the workpiece is uniform, making it possible to equalize the welding strength.Also, simultaneous welding at close positions is possible, which improves work efficiency. Moreover, it is an object of the present invention to provide a welding device that can efficiently cool an electrode rod.

Therefore, the feature of the present invention is that one electrode of a plurality of pairs of electrode rods is attached to an electrode rod mounting block in a cylindrical structure so that it can move forward and backward in small strokes, and the electrode rod mounting block is attached to a movable part of a press machine. In a welding device attached to a side attachment part and/or a fixed side attachment part; it has a large cylinder chamber and a small cylinder chamber connected to the large cylinder chamber;
A pressure booster in which the piston reciprocates within the large cylinder chamber by switching the switching valve, and the rod is placed in the large cylinder chamber or the rod is placed in the small cylinder chamber. With the rod contained in the large cylinder chamber, cooling water is supplied from the small cylinder chamber to the pressure chamber of the cylinder structure through the hollow part of the electrode rod, and the rod is a fluid supply path for stopping the supply of cooling water to the pressure chamber when the rod is inside the small cylinder chamber; The second switching valve is in the open state to discharge the cooling water from the pressure chamber, and while the rod is in the small cylinder chamber, the second switching valve is in the closed state to discharge the cooling water from the pressure chamber. and a fluid discharge path for sealing the pressure chamber and applying water pressure to the pressure chamber to advance the electrode rod 14 in small strokes.

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

FIG. 1 shows a welding device used in the method of the invention. In the figure, reference numeral 1 denotes a press machine, in which a movable side attachment part 3 for attaching an upper die and a fixed side attachment part 4 for attaching a lower die to an upright base frame 2.
Equipped with. 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 mounting section 3 consists of a base plate 6 connected to the cylinder 5, and an electrode plate 8 attached to the lower surface of the base 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 base plate 9 via an insulating plate 10, and is fixedly attached to the lower side of the base frame 2. has been done.

Reference numeral 12 denotes an upper electrode rod unit that is attached to the movable side attachment part 3, and includes a metal base 13 and a metal electrode rod attachment block 15 for attaching a plurality of electrode rods 14 to the base 13. Naru, foundation 1
It is attached to the lower surface of the electrode plate 8 at the periphery of the electrode plate 8 by a plurality of fixing tools 16 and fixing screws 17 . Electrode rod 14... has a cylinder structure (described later)
It is supported by the mounting block 15 so that it can move forward and backward in small strokes as shown by arrow B. In addition, in the illustrated example, three electrode rods 14 are shown, and two electrode rods 14, 1
4 is vertically mounted by a common mounting block 15, and the other electrode rod 14 supported by another mounting block 15 is mounted on a substantially triangular pedestal 18.
It is installed in an inclined manner.

Reference numeral 19 denotes a lower electrode rod unit that is attached to the fixed side attachment part 4, and is used to attach a metal base 20 and the lower electrode rods 21 that are paired with the upper electrode rods 14 to the base 20. It consists of a mounting block 22 and a plurality of fixtures 1 at the periphery of the base 20.
6... and the fixing screws 17..., the electrode plate 11
attached to the top surface of the Note that the lower electrode rod 21
is fixed.

23, 23 is the base 2 of the lower electrode rod unit 19
A fitting member 25, which is a male guide part erected on top of the cylindrical body 26 and can be fitted to the female guide parts 24, 24 of the upper electrode unit 12, is attached to the upper part of the cylindrical body 26.
7 so that it can move up and down. The male guide part 23 and the female guide part 24 allow the upper and lower electrode rod units 12 and 19 to be accurately aligned with each other, and the electrode plates 8 and 1 of each of the upper and lower electrode rod units 12 and 19 can be accurately aligned.
1 can be easily attached. 28 is a power supply unit, 29 is a wiring cable that connects the positive pole of the power supply unit 28 and the electrode plate 8, and 30 is a wiring cable that connects the negative pole of the power supply unit 28 and the electrode plate 11.

Therefore, the electrode rod 1 of the upper electrode rod unit 12
As shown in FIGS. 2 and 4, 4... is formed with a piston portion 31 at its base end,
is slidably fitted into the cylinder chamber 32 inside the mounting block 15. That is, the electrode rod 14 forms a cylinder structure 33 together with the mounting block 15,
The cylinder structure portion 33 allows movement forward and backward with a small stroke. 34 is a pressure chamber communicating with the cylinder chamber 32, and the pressure chamber 3 of one mounting block 15
4 is formed astride two cylinder chambers 32, 32.

The electrode rod 14 is supplied with cooling water from the pressure intensifier 37 through the fluid supply path 35 to the pressure chamber 34, and is moved forward by the fluid pressure acting on the pressure chamber 34, and is moved back by the return spring 36. That is, the pressure intensifier 37 has a large cylinder chamber 45 and a small cylinder chamber 38 connected to the large cylinder chamber 45. By switching the first switching valve 48, the piston 49 is moved into the large cylinder chamber 45.
The supply path 35 branches in the middle and connects two electrode rod mounting blocks 15, 1.
5 and further opens into a hollow portion 39 of each electrode rod 14 . . . and communicates with the cylinder chamber 32 and pressure chamber 34 via the hollow portion 39 . That is,
The fluid supply path 35 within the mounting block 15 is
As shown in FIG. 4, a horizontal hole 40 formed in the mounting block 15, a pipe 41 installed in the wall of the pressure chamber 34 so as to communicate with the horizontal hole 40, and a pipe 41 that opens on the pressure chamber 34 side. It is formed from the hollow portion 39 described above. Further, a fluid discharge path 42 is formed from the pressure chambers 34, 34, and a second switching valve 44 for opening and closing the flow path is interposed downstream of the confluence point 43.

Thus, the large cylinder chamber 45 has openings 45a and 45b at the front and rear parts, and the openings 4
Air introduction passages 46 and 47 are connected to air introduction passages 5a and 45b, and these introduction passages 46 and 47 are connected to a first switching valve 48. Moreover, in the small cylinder chamber 38,
A cooling water inlet 38a and a cooling water outlet 38b are opened, and the cooling water inlet 38a is connected to a supply path 35a.
are connected to each other, and the fluid supply path 35 is connected to the cooling water outlet 38b. And the supply path 35
Cooling water is supplied from a to the small cylinder chamber 38 through the inlet 38a, and when the switching valve 48 and the switching valve 44 of the fluid discharge passage 42 are in the state shown in FIG. By flowing as shown in FIG. 3 and cooling each electrode rod 14 . . . and switching both switching valves 48 and 44 as shown in FIG. The water pressure P acts equally on the pressure chambers 34 of the electrodes 15, 15, and the electrode rods 14 advance simultaneously due to the water pressure P.

As shown in FIG. 4, the tip member 50 at the tip of the electrode rod 14 is detachable and replaceable by means of a screw connection 51, and its length can be adjusted by means of a fixing nut 52 which fixes the tip member 50. The tip member 50 is also directly connected to the mounting block 15 as an electrode through a conductive cable 53. 54 is a mounting bracket for the conductive cable 53;
5 is a mounting bolt, and 56 is a V-packet attached to the piston portion 31 of the electrode rod 14 with a retaining ring 57.

Next, a case in which workpieces are welded using the welding apparatus described above will be explained using FIGS. 1, 2, and 3. In FIG. 1, the movable mounting portion 3 of the press 1 is in the raised position, and the upper electrode rods 14 are also in the retracted position with respect to the mounting block 15. From this state, operate the cylinder 5 and move the movable side mounting part 3
is lowered with a large stroke to bring all the upper electrode rods 14 closer to the lower electrode rods 21. This state is shown in FIG.
The switching valve 44 is in the position shown in FIG.
a is located inside the large cylinder chamber 45, water is supplied into the small cylinder chamber 38, flows through the fluid supply path 35 and the fluid discharge path 42 as shown by the arrow, and along the way, each electrode rod 14... is hollow. The electrode rod 14 is cooled by passing through the section 39 as shown by the arrow shown by the phantom line in FIG. 4 (the electrode rod 14 at this time is shown by the phantom line). Thereafter, at the same time as stopping the lowering of the movable mounting portion 3 by the cylinder 5, switching the switching valves 48 and 44 to the positions shown in FIG. 3, closing the fluid discharge passage 42, and advancing the piston 49 of the pressure intensifier 37. rod 49a
The pressure chamber 34 is internalized in the small cylinder chamber 38.
The inside of each mounting block 1 is sealed.
Apply water pressure P to the pressure chambers 5 and 15 to move the electrode rod 14 forward in a small stroke, bring the tip into contact with the workpiece W on the lower electrode rod 21... and press it further, so that the lower electrode rod 21 and Welding is performed by applying current to the workpiece W under pressure between the welding and the workpieces. The water pressure P acts equally on each pressure chamber 34, 34 through the common fluid supply path 35, and all the upper electrode rods 14 move forward at the same time, and the pressing force against the workpiece W becomes equal. After that, each switching valve 48, 44 is switched to the position shown in Fig. 2 to release the water pressure P, all the electrode rods 14 are moved back by a small stroke by their return springs 36, and the cylinder 5 is activated again to make it movable. Side mounting part 3
to rise. In this upward stroke, all the upper electrode rods 14 are cooled by water supplied from the fluid supply path 35 as described above. Thereafter, similar steps are repeated to sequentially perform welding.

In another embodiment shown in FIG. 5, a mounting block 15 on which an electrode rod 14 is supported in a movable manner is laterally mounted on a base 20 of a lower electrode rod unit 19 via an insulating plate 58. Yes, fluid supply path 35
and the upper electrode rod unit 12 at the fluid discharge path 42.
The mounting blocks 15, 15 are connected in communication with each other. In this way, vertical, diagonal, and horizontal welding can be performed simultaneously with one welding device.

In the welding apparatus described above, by employing the pressure intensifier 37, the water pressure P in the pressure chamber 34 necessary to operate the electrode rod 14 (for example, 35 to 20 Kg/cm ² )
can be easily obtained with a small amount of power, and is economical compared to the case of a pump. In addition, the upper electrode rod unit 12 and the lower electrode rod unit 19
are other electrode rod units 12, 19 in which the number, spacing, length, etc. of the electrode rods 14..., 21... are different.
The press machine 1 can be freely replaced with the press machine 1, and a general press machine 1 can be used. Furthermore, the electrode rod mounting block 1 to which the electrode rods 14 and 21 are attached
It is also possible to replace only 5 and 22. Furthermore, in the upper electrode unit 12, the mounting block 15, which is in electrical conduction with the electrode plate 11, and the tip member 50 at the tip of the electrode bar 14 are connected by a conductive cable 53, so that electricity can be transferred to the mounting block. 15
The V-packet 56 of the piston portion 31 of the electrode rod 14 is prevented from generating an arc, and the piston portion 31 and the V-packet 56 are not damaged by the arc.

Since the present invention is configured as described above, it produces the effects described below.

That is, the pressing force against the workpiece W by each electrode rod 14 on one side becomes uniform over the entire welding process, and the welding strength of each part can be made uniform. In particular, even if the tips of the pair of electrode rods 14, 21 wear out, the same pressing force is always maintained, and the pressing force does not change as in the conventional fixed electrode rod type. Furthermore, it is possible to arrange the electrode rods 14... and 15... at small intervals, allowing for simultaneous welding at close positions and a fast welding cycle (for example, 15 to 15 seconds per minute).
It is possible to perform welding even after 16 welding steps), 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 temporarily store the workpiece W during the welding process, and work efficiency is improved. Further, the electrode rod 14 and its mounting block 15 can be attached and removed as a unit and can be replaced, and there is also an advantage that it can be attached to an ordinary type of press machine 1. Furthermore, the electrode rod 14 can be efficiently cooled, and the device can be simplified and cost reduced. When the rod 49a is in the large cylinder chamber 45, cooling water is supplied from the small cylinder chamber 38 to the pressure chamber 34 through the hollow part 39 of the electrode rod 14, and fluid is supplied from the pressure chamber 34. Discharge path 4
2, the cooling water flows through the hollow part 39 of the electrode rod 14 and the electrode rod 14 is cooled, leaving the rod 49a inside the small cylinder chamber 38. Then, the pressure chamber 34 is sealed and each electrode rod 14... advances, and the electrode rod 14...
... can press the workpiece W. In other words, without providing separate pressurizing fluid circuits and cooling fluid circuits, and without creating a large-scale device, the electrode rod can be
4 cooling state or workpiece W pressurizing state. Furthermore, since the cooling water is shared as the pressurizing fluid, the cooling water can be used effectively and there is less waste.

[Brief explanation of drawings]

FIG. 1 is a front view of a welding device showing an embodiment of the present invention, FIG. 2 is an enlarged longitudinal cross-sectional view of the main parts of the welding device showing a state in which the movable side attachment part of the press is lowered, and FIG.
The figure 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 showing details of the attachment part of the movable electrode rod, and Fig. 5 is the main part showing another embodiment. It is an enlarged longitudinal cross-sectional view. 1...Press machine, 3...Movable side mounting part, 4...
Fixed side mounting part, 14, 21... Electrode rod, 15...
Electrode rod mounting block, 33... cylinder structure part,
34...pressure chamber, 35...fluid supply path, 39...
Hollow part, 42...Fluid discharge path, 44...Switching valve.

Claims (1)

[Claims] 1. One side of the electrode rod 14 of a plurality of pairs of electrode rods 14, 21, . In a welding device in which the rod mounting block 15... is attached to the movable side attachment part 3 and/or the fixed side attachment part 4 of the press machine 1, a large cylinder chamber 45 and a small cylinder connected to the large cylinder chamber 45 are installed. The piston 49 reciprocates within the large cylinder chamber 45 by switching the first switching valve 48, and the rod 49a is in the large cylinder chamber or the rod 4
The pressure intensifier 37 is switched to a state in which the rod 9a is located in the small cylinder chamber 38, and the small cylinder chamber 38 is switched to a state in which the rod 49a is located in the large cylinder chamber 45.
Cooling water is supplied to the pressure chamber 34 of the cylinder structure 33 through the hollow part 39 of the electrode rod 14, and with the rod 49a contained within the small cylinder chamber 38, With the fluid supply path 35 stopping the supply of cooling water to the pressure chamber 34 and the rod 49a contained within the large cylinder chamber 45, the second switching valve 44 is in an open state. While the cooling water is discharged from the pressure chamber 34, the rod 49a is removed from the small cylinder chamber 38.
The second switching valve 44 is in an internal state.
is in a closed state, the pressure chamber 34 is sealed, and water pressure P is applied to the pressure chamber 34 to close the electrode rod 14.
Fluid discharge path 42 that moves forward by a small stroke
A welding device comprising: and.