JPS6156783A - Welding equipment - Google Patents

Abstract

PURPOSE:To equalize the pressing power throughout all welded parts against a work by electrode sticks and to make the welding intensity of each part constant by providing a amplifier to amplify the fluid to a fluid supply route up to the necessary pressure for a pressure room. CONSTITUTION:Converter valves 48, 44 are converted to close a fluid discharge route 42 and advance a piston 49 of an amplifier 37. A electrode stick advances at a small stroke by acting a water pressure W into a pressure room 34 of each mounting block 15, and the edge are contacted with a work W on the below electrode sticks 21... and pressed to weld a work W while pressed between the below electrode stick 21. A water pressure P acts equally to each pressure room 34 by the common fluid supply route 35 and at the same time all electrode sticks 14... on the upper side advances to equalize the pressing power against the work W.

Description

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

Electrical resistance/8-contact 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. are designed to operate simultaneously. However, there was a drawback in 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 feature of the present invention is that one side of the 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 with a small stroke, and the electrode rod mounting block is attached to a press machine. The pressure chambers of each cylinder structure are connected to each other through a common fluid supply path, and the fluid supply path supplies the necessary fluid to the pressure chambers. The main feature is that a pressure intensifier is installed to increase the pressure to a predetermined level.

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, numeral 2 indicates a press machine, and the upright base frame 2 is provided with a movable side attachment part 3 for attaching an upper die and a fixed side attachment part 4 for attaching a lower die. Movable side mounting part 3
is vertically movable as shown by arrow A by one ram-shaped cylinder 5 vertically attached to the base frame 2. That is, the mounting portion 3 includes 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.
Along the guide rail (not shown), 1
to move up and down. On the other hand, like the movable side attachment part 3, the fixed side attachment part 4 also has a base plate 9 and an insulating plate 10 on the upper surface of the base plate 9.
The electrode plate 11 is fixed to the lower chamber of the base frame 2.

Reference numeral 12 denotes an upper electrode rod unit that is attached to the movable attachment section 3, and includes a metal base 13 and a metal electrode attachment block 15 for attaching a plurality of electrode rods 14 to the base 13. The electrode plate 8 is attached to the lower surface of the electrode plate 8 at the periphery of the base 13 by a plurality of fixing tools 16 and fixing screws 17 . The electrode rods 14 are supported by a mounting block 15 by a cylinder structure (described later) so that they 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 14.14 are shown.
is mounted vertically by a common mounting block 15, and another electrode rod 14 supported by another mounting block 15 is mounted obliquely by a substantially triangular pedestal 18.

19 is a lower electrode rod unit attached to the fixed side attachment part 4, and includes a metal base S20 and an upper electrode rod 14...
It consists of a mounting block 22 for attaching the lower electrode rod 21 that pairs with the substrate 20, and a plurality of fixing tools 16 and fixing screws 17 on the periphery of the substrate 20.
... is attached to the upper surface of the electrode plate 11. 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 is movable up and down by an elastic member 27 at the upper part of the holder. The male guide part 23 and the female guide part 24 allow accurate alignment between the upper and lower electrode rod units 12.19, and the respective electrodes +ff18 of both 12.19
．． 11 can be easily attached.

Reference numeral 28 designates a power unit node, 29 a wiring cable connecting the positive pole of the power supply unit 28 and the electrode plate 8, and 30 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 FIGS. 2 and 4, the piston portion 31 is formed on the base θj1.1 side, and the piston portion 31 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, and can move forward and backward through a small stroke by the cylinder structure 33. 34 is the cylinder chamber 32
The pressure chamber 34 of one mounting block 15 is formed astride two cylinder chambers 32, 32.

The electrode rod 14 is moved forward by the fluid pressure P acting on the pressure chamber 34 through the fluid supply path 35, and is moved back by the return spring 36. Specifically, the fluid supply path 35 has a pressure intensifier 3 on the way.
7, communicates with the small cylinder chamber 38 of the pressure intensifier 37, and branches downstream from the pressure intensifier 37 to form a 2 fl cylinder.
I'Jr into the hollow part 39 of each electrode rod I4...
It communicates with the cylinder chamber 32 and the pressure chamber 34 via the hollow portion 39. That is, as shown in FIG. 4, the fluid supply path 35 in the mounting block 15 is installed in the wall of the pressure chamber 34 so as to communicate with the horizontal hole 40 formed in the mounting block 15. The hollow portion 39 is formed from a hollow pipe 41 and the hollow portion 39 that opens to the pressure chamber 34 side. Furthermore, a fluid discharge path 12 is formed from the pressure chambers 34, 34, and a switching valve 44 for opening and closing the flow path is interposed downstream of the confluence point 43.

Air introduction passages 46,47 are formed from the front and rear parts of the large cylinder chamber 45 of the pressure intensifier 37, respectively, and a switching valve 48 is provided in the liquid introduction passage 46,47. That is, water is supplied to the small cylinder chamber 38 from the fluid supply path 35, and the switching valve 48 and the switching valve 4 of the fluid discharge path 42
4 in the state shown in FIG. 2, water flows through the supply path 35 and the discharge path 42 as shown by the arrows to cool each electrode rod 14, and both switching valves 48 and 44 are switched as shown in FIG. , the piston 49 of the pressure intensifier 37 advances, and the water pressure P acts equally on the pressure chamber 34 of each electrode rod mounting block 15.15 from the fluid supply path 35, and the water pressure P causes each electrode rod 14... Advance.

As shown in FIG. 4, the electrode rod 14 has a tip member 50 at the tip that can be attached and detached freely by a nephew coupling 51, and the length can be adjusted by a fixing nut 52 that fixes the tip member 50. . The chip member 50 is connected to the mounting block 1 as an electrode using a conductive cable 53.
5. 54 is conductive;
-7'/0 mounting for L153 All 0 mounting brackets The mounting bolt 56 is a gasket 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 78 welding device described above will be explained with reference to FIGS. 1, 2, and 3. In FIG. 1, the movable mounting portion 3 of the press &'' 511 is in the raised position, and the upper electrode rod 14 is also in the retracted position with respect to the mounting block 15. From this state, the cylinder 5 is operated. Lower the movable side mounting part 3 with a large stroke, and connect all the upper electrode rods 14... to the lower electrode rods 21...
・Bring it close to. This state is shown in FIG.
The switching valve 44 is in the position shown in FIG.
5 and the fluid discharge path 42 as shown by the arrows, and on the way, the electrode rods 14 are cooled by passing through the hollow portions 39 of each electrode rod 14 as shown by the arrows shown by imaginary lines in FIG. (The electrode rod 14 at the time is shown by a phantom line). Thereafter, the lowering of the movable mounting portion 3 by the cylinder 5 is stopped, and at the same time, the switching valve 4
8.44 to the position shown in Figure 3, the fluid discharge path 42 is closed, and the four pistons of the pressure intensifier 37 are moved forward, thereby applying water pressure to the pressure chamber 34 of each installation pro-tock 15.15. P is applied to move the electrode rod 14 forward by a small stroke, and the tip contacts the workpiece W above the lower electrode rod 21 and presses it further, and presses the workpiece W between it and the lower electrode rod 21. Weld by applying electricity in a compressed state. Note that 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.

Thereafter, 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 with their return springs 36, and the cylinder 5 is operated again. Raise the movable side attachment part 3. In this upward stroke, all the upper electrode rods 14 are cooled by water supplied from the fluid supply path 35 as described above. From then on,
Welding is performed sequentially by repeating similar steps.

In another embodiment shown in FIG.
It is mounted laterally on the base 20 of the upper electrode rod 1 through an insulating plate 58, and is connected to the upper electrode rod UNISO 1 through a fluid supply path 35 and a fluid discharge path 42 to the 12 mounting blocks 15° 15. . In this way, vertical, diagonal, and horizontal welding can be performed simultaneously with one welding device.

In the welding apparatus described above, the fluid supply path 35 is commonly used for pressurizing the electrode rod 14 against the workpiece W during welding, and for cooling the electrode rod 14 during times other than when welding, which simplifies the welding apparatus. In addition to being able to reduce costs, cooling can also be performed efficiently. Moreover, the upper electrode rod unit 12 and the lower electrode rod unit 19 can be freely replaced with other electrode rod units 12 and 19 that differ in the number, spacing, length, etc. of the electrode rods 14...21. ,
Moreover, a general press machine 1 can be used. Furthermore, it is also possible to replace only the electrode rod mounting blocks 15, 22 to which the electrode rods 14, 21 are attached. In addition, in the upper electrode unit 12, the mounting block 15 which is in a conductive relationship with the electrode plate 11 and the tip member 50 at the tip of the electrode rods 1, 1, . will flow directly from the mounting block 15 to the tip member 50, preventing arc generation at the (1) packing 56 portion of the piston portion 31 of the electrode No. 14, and preventing damage to the piston portion 31 and (1) packing 56 due to the arc. There is no.

The present invention has effectively achieved its intended purpose with the configuration detailed above. That is, the electrode rods 14 on one side of the plurality of pairs of electrode rods 14, 2, . is 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 34 and 34 of each of the above-mentioned cylinder structure parts 33...
... are connected through a common fluid supply path 35, and a pressure intensifier 37 is installed in the fluid supply path 35 to increase the pressure of the fluid to a predetermined pressure required for the pressure chambers 34. The pressing force against the workpiece W by each electrode rod 14 on one side is uniform over all the welded parts, and the welding strength of each part can be made uniform. In particular, even if the tips of the pair of electrode rods 14 and 21 become worn, the same pressing force is always maintained, and the pressing force does not change unlike the conventional fixed electrode rod type. Moreover,
The water pressure P (for example, 35 to 20 kg/c) in the pressure chamber 34 required to operate the electrode rod 14 can be easily obtained using a low-pressure air source, and it is more economical than using a pump. At the same time, the electrode rod 14.
... can be arranged at small intervals, and simultaneous/eight contact at close positions is possible. Moreover, a fast welding cycle (
For example, welding can be performed at a rate of 15 to 16 times per minute), and the work W can be flowed in synchronization with the press cycle of the previous press process.

Therefore, there is no need to temporarily shake the workpiece W during the welding process, and work efficiency is improved. difference.

Furthermore, the electrode rod 14 and its mounting block 15 can be attached and detached as a unit and can be replaced, and there is an advantage in attaching it to the Hpt-type press machine 1.

[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 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 welding device. Fig. 4 is an enlarged longitudinal cross-sectional view of the main part of the '/'8 contact device showing the state when FIG. DESCRIPTION OF SYMBOLS 1... Press machine, 3... Movable side attachment part, 4... Fixed side attachment part, 14.21... Electrode rod, 15... Electrode rod attachment block, 33... Cylinder structure part , 34...
・Pressure chamber, 35...Fluid supply path, 37...Pressure intensifier,
W...Work. Patent applicant: Takao Kinkuta Kogyo Co., Ltd. Figure 3] Figure 4

Claims (1)

[Claims] 1. One side of the electrode rod 14 of the plurality of pairs of electrode rods 14, 21... is attached to the electrode rod mounting block 15 with a cylindrical structure so that it can move forward and backward in small strokes, and the electrode rod mounting block 15... are attached to the movable side attachment part 3 and/or fixed side attachment part 4 of the press machine 1, and the pressure chambers 34... of each of the cylinder structure parts 33... are connected to the common fluid supply path 35. The welding apparatus is characterized in that the fluid supply path 35 is provided with a pressure intensifier 37 for increasing the pressure of the fluid to a predetermined pressure required for the pressure chambers 34 .