JPS6156781A - Welding method - Google Patents

Abstract

PURPOSE:To make the welding intensity constant and equalize the pressing power of all electrodes against a work by connecting a pressure room of a cylinder structure part at the common fluid supply route and pressing a work acting fluid pressure in the pressure room. CONSTITUTION:All electrode sticks 14... on the above side are approached on the below side of electrode sticks 21... by falling a mounting part on the mobile side acting cylinders. Thereafter, falling a mounting part on the mobile side is stopped, converter valves 48, 44 are switched to close a fluid discharge route 42 and advance a piston 49 of an amplifier 37. Therefore, an electrode stick 14 is advanced at a small stroke by acting a water pressure P into a pressure room 34 of each mounting block 15 and the edge is contacted with a the above work W. Further, the said edge is pressed and welded on the condition that a work W is pressed between the below electrode stick 21. A water pressure P is acted constantly by the common fluid supply route 35 to each pressure room 34 and the above all electrode sticks 14... are advanced at the same time to make the pressure power against a work W.

Description

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

In electric resistance welding, when welding multiple locations on a workpiece at the same time using multiple electrode rods, conventionally each electrode rod was moved forward and backward using its own dedicated electrode movement foot. There was a problem that the pressing force of the electrode rods was not uniform over all the electrode rods, which caused variations in welding strength.Also, if the tips of each electrode rod were worn unevenly, the above-mentioned There was a large difference in the pressing force, and variations in welding strength were occurring.

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 the welding strength uniform.Also, simultaneous welding at close positions is possible, making the work easier. The purpose is to provide a welding method that can improve efficiency.

Therefore, the feature of the present invention is that one electrode rod of a plurality of pairs of electrode rods is attached to the fixed side attachment part of the press machine, and the other side electrode rod is attached to the movable side attachment part of the press machine. The pressure chambers of each cylinder structure are connected to each other through a common fluid supply path, and the electrode rods on the other side are pressed together with a large stroke by the press machine. Then, by applying fluid pressure to each of the pressure chambers from the fluid supply path, the electrode rods are further simultaneously moved forward by small strokes, and by the action of the fluid pressure, the electrode rods and the electrode rod on one side are The point is that the workpiece is welded by applying pressure between the two.

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, 1 is a press machine, which is equipped with an upright base frame 2, a movable part for attaching the upper die, a side attaching part 3 and a fixed attaching part 4 for attaching the lower die. The 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 part 3 has a base plate 6 connected to the cylinder 5, It consists of an electrode plate 8 attached to the lower surface of the cough table plate 6 via an insulating plate 7, and moves up and down along a guide rail (not shown).On the other hand, like the movable side attachment part 3, the fixed side attachment part 4 is also a stand. An insulating plate 1 is placed on the top surface of the board 9 and the cough table board 9.
The electrode plate 11 is fixed to the lower part of the base frame 2.

Reference numeral 12 denotes an upper mold (roller 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 for attaching a plurality of electrode rods 14 to the base 13. 15, and is attached to the lower surface of the electrode plate 8 by a plurality of fixtures 16 and fixing screws 17 at the periphery of the base 13.The electrode rods 14 are attached by a cylinder structure (described later). It is supported by the block 15 so that it can move forward and backward in small strokes as shown by arrow B. In the illustrated example, three electrode rods 14 are shown, and two electrode rods 14.1
4 are vertically mounted 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.

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 a mounting block 22 for attaching the lower electrode rods 21 paired with the base 20 to the base 20, and a plurality of fixtures 16 and fixing screws 17 on the periphery of the base 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 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 make it possible to accurately align the upper and lower electrode rod units 12 and 19 with each other, and also to align each electrode plate 8.1 of both 12 and 19.
1 can be easily attached.

28 is a power supply unit, 29 is a wiring cable connecting the positive pole of the power supply unit 28 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 FIGS. 2 and 4, the piston portion 31 is formed on the proximal end side, and the piston portion 31
It is slidably fitted into the internal cylinder chamber 32. 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 a pressure chamber communicating with the cylinder chamber 32, and the pressure chamber 34 of one mounting block 15 is formed astride the two cylinder chambers 32 and 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, communicating with the small cylinder chamber 38 of the pressure intensifier 37, branching downstream from the pressure intensifier 37 and reaching into two electrode rod mounting blocks 15 and 15, and furthermore, each electrode rod 14... opens into the hollow part 39 of the hollow part 3
It communicates with the cylinder chamber 32 and the pressure chamber 34 via 9. That is, the fluid supply path 35 within the mounting block 15
As shown in FIG. 4, there is 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 on the pressure chamber 34 side. It is formed from the three open hollow parts. Furthermore, pressure chamber 3
A fluid discharge path 42 is formed from 4.34, and a confluence point 43
A switching valve 44 for opening and closing the flow path is interposed further downstream.

Air introduction passages 46 and 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 introduction passages 46 and 47. 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 is 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 by switching both the switching valves 48 and 44 as shown in FIG. 3, The piston 49 of the vessel 37 moves forward to increase the pressure, and the water pressure P is transferred from the fluid supply path 35 to the pressure chamber 34 of each electrode rod mounting block 15.15.
act evenly, and each mold, 1 fence rod 14..., moves forward at the same time 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 a screw connection 51, and a fixing nut 52 fixes the tip member 50.
Length J circumference adjustment force (possible 17. And 1000 nov.

The member 50 is connected directly to the mounting block 15 as an electrode by means of a conductive cable 53. 54 is a mounting bracket for the conductive cable 53, 55 is a mounting bolt thereof, and 56 is a gasket attached to the piston portion 31 of the electrode rod 14 with a stopper 57.

Next, the welding method 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 lower electrode rods 14 are also in the retracted position with respect to the mounting block 15. From this state, the cylinder 5 is actuated to lower the movable side mounting part 3 with a large stroke, and all the upper electrode rods 14... are moved to the lower electrode rods 2.
Bring it closer to 1... This state is shown in FIG. 2. Up to this point, the switching valves 48 of the air introduction passages 46 and 47 and the switching valves 14 of the fluid discharge passages 42 are in the positions shown in FIG. It flows through the channel 42 as shown by the arrow, and along the way, it passes through the hollow portion 39 of each electrode rod 111 as shown by the arrow shown by the imaginary line in FIG. 4 to cool the electrode rod 14. 14 is shown in phantom). Thereafter, the lowering of the movable mounting portion 3 by the cylinder 5 is stopped, and at the same time the switching valves 48 and 44 are switched to the positions shown in FIG. 3, the fluid discharge passage 42 is closed, and the piston 49 of the pressure intensifier 37 is moved forward.

As a result, water pressure P is applied to the pressure chambers 34 of each mounting block 15.15, and the electrode rod 14 is advanced by a small stroke, and the tip is brought into contact with the lower electrode rod 21...the upper workpiece W and is further pressed. , and the lower electrode rod 21, the workpiece W is welded by applying current in a pressurized state. The water pressure P acts equally on each pressure chamber 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 by 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. Thereafter, similar steps are repeated to sequentially perform welding.

In the welding method described above, the fluid JJl supply path 35 is used for pressurizing the electrode rod 14 forward against the workpiece W during welding, and for cooling the electrode rod 14 at times other than during welding.
Since they are shared, the welding equipment can be simplified and cost reduced, and cooling can be performed efficiently. In addition, by adopting 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
/ CII? ) can be easily obtained with small power and is economical compared to the case of pumps. In addition, in the above-mentioned welding apparatus, the upper electrode unit 1
2 and lower electrode rod unit 19, electrode rod 14...
21... can be freely replaced with other electrode rod units 12, 19 having different numbers, intervals, lengths, etc., and moreover, a general press R1 can be used. Furthermore, it is also possible to replace only the electrode extraction block 15.22 from which the electrode rod 14.21 has been removed. In addition, in the upper electrode rod 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 rod 14 are connected by a conductive cable 53, so that electricity is It flows directly from the block 15 to the tip member 50, preventing arc generation at the V-packet 56 of the piston portion 31 of the electrode rod 14, and preventing damage to the piston portion 31 and the V-packet 56 due to the arc. .

The present invention has effectively achieved its intended purpose with the configuration detailed above. That is, the electrode rods 21 on one side of the plurality of pairs of electrode rods 14, 21, . It is attached to the movable side attachment part 3 of the machine 1 in a cylinder structure so that it can move forward and backward, and the pressure chamber 3 of each cylinder structure part 33...
4 are connected to each other through a common fluid supply path 35, and the electrode rods 14 on the other side are brought close to the electrode rods 21 on the one side with a large stroke by the press machine 1, Thereafter, each of the pressure chambers 3 is supplied from the fluid supply path 35.
4... by applying fluid pressure to the electrode rod.

14... are further simultaneously advanced by a small stroke, and the workpiece W is welded by pressurizing between the electrode rod 14... and the electrode rod 21 on one side due to the action of the fluid pressure.) ! Therefore, the pressing force against the workpiece W by each electrode rod 14 on the movable side is uniform over all the welding parts, and the
The contact strength can be made uniform. In particular, a pair of electrode rods 14 and 21
Even if the tip of the electrode becomes worn, the same pressing force is always maintained, and the pressing force does not change unlike conventional fixed electrode rod types. In addition, 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 seconds per minute).
16 times), and the workpiece W can be flowed in synchronization with the press cycle of the press process in the previous process. Therefore, the workpiece W is once subjected to stress during the welding process.
This eliminates the need for manual labor and improves work efficiency. Furthermore, there is also the advantage that the press machine 1 can be of the Jintsu type.

[Brief explanation of the drawing]

Fig. 1 is a front view of the welding device used in the method of the present invention, Fig. 2 is an enlarged vertical cross-sectional view of the main parts of the welding device showing the state in which the movable side mounting part of the press machine is lowered, and Fig. 3 is a front view of the welding device used in the method of the present invention. FIG. 4 is an enlarged vertical cross-sectional view of the main part of the welding device showing the state, and FIG. 4 is an enlarged vertical cross-sectional view showing details of the attachment part of the movable electrode ring. DESCRIPTION OF SYMBOLS 1... Press machine, 3... Movable side attachment part, 4... Fixed side attachment part, 14.21... Electrode rod, 33... Cylinder structure part, 34... Pressure chamber, 35 ...Fluid supply path, W...Work. Patent applicant: Takao Kindo Kogyo Co., Ltd. Figure 3 Figure 4

Claims (1)

[Claims] 1. Attach the electrode rods 21 on one side of the plurality of pairs of electrode rods 14, 21, ... to the fixed side mounting part 4 of the press machine 1, and attach the electrode rods 14 on the other side to the press machine 1. The cylinder structure is attached to the movable side mounting part 3 of the machine 1 so that it can move forward and backward, and the pressure chambers 34 of each cylinder structure part 33...
are connected to each other through a common fluid supply path 35, and the electrode rods 14 on the other side are made to approach the electrode rods 21 on the one side with a large stroke by the press machine 1, and then the From the fluid supply path 35 to each of the pressure chambers 34...
・The electrode rods 14 are simultaneously moved forward by a small stroke by applying fluid pressure to the electrode rods 14... and the electrode rods 21 on one side are moved by the action of the fluid pressure. A welding method characterized by welding a workpiece W under pressure.