JPH0350630B2 - - Google Patents

Description

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

[Conventional technology and its problems]

an upper mold mounting part to which multiple electrode rods are attached;
In a welding device equipped with a lower die attachment part to which multiple electrode rods are attached, when applying a pressing force to the workpiece interposed between the upper and lower electrode rods during welding, the upper die attachment part is It had to be lowered using a press.

Therefore, the press machine has to move the upper mold attachment part up and down and apply a pressing force to the workpiece, and a large press machine is required.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a welding device that can reduce the size of a drive device for vertically moving an upper die mounting part, and can evenly apply the pressing force of an electrode rod to a workpiece. .

[Means for solving problems]

In order to achieve the above-mentioned object, a welding device according to the present invention includes an upper mold mounting portion to which a plurality of first electrode rods are attached, and a lower mold mounting portion to which a plurality of second electrode rods are attached. In a welding device for welding a workpiece with a workpiece interposed between the first electrode rod and the second electrode rod; The first electrode rod is attached to the mold attachment part, and the first electrode rod is movable up and down, and the first electrode rod is pressed downward at the lowest position of the upper mold attachment part to attach the first electrode to the workpiece. A fluid pressure mechanism that presses the rod is connected to the first electrode rod.

[Effect]

A crank mechanism is used to move the upper mold mounting part up and down, and a fluid pressure mechanism is used to apply pressing force to the workpiece. In other words, a pressing force is applied to the workpiece by pressing the first electrode rod downward by the fluid pressure mechanism at the lowest position of the upper mold attachment part (bottom dead center of the crank mechanism), and as a crank mechanism, All you need to do is move the upper die mounting part up and down.

〔Example〕

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

In FIG. 1, reference numeral 1 denotes a welding device, which is installed inside an upright base frame 2, and includes an upper mold mounting part 4 to which a plurality of first electrode rods 3 are attached, and a plurality of second electrode rods 5. Lower mold mounting part 6 where ... is attached
It is equipped with.

Thus, the upper mold mounting part 4 is vertically movable via a crank mechanism 7 attached to the upper mold mounting part 4, and a base plate 8 connected to the crank mechanism 7,
An electrode plate 10 is attached to the lower surface of the base plate 8 via an insulating plate 9.

The crank mechanism 7 includes a connecting rod 12 whose one end is pivotally attached to a mounting portion 11 on the upper surface of the base plate 8.
and a crank arm 13, one end of which is pivotally connected to the other end of the connecting rod 12. The crank arm 13 rotates around a fixed shaft 14 at the other end of the crank arm 13, It is rotated as shown by the imaginary line by a driving member such as a motor. Therefore, the upper mold attachment part 4 moves up and down as shown by arrow A within the diameter of the circle shown by the imaginary line. In other words, when the pivot shaft 15 of the crank arm 13 and the connecting rod 12 is at the uppermost position (top dead center), the upper mold mounting part 4 is at the uppermost position, and the pivot shaft 15 is at the lowest position (bottom dead center). At this time, the upper die mounting portion 4 is at the lowest position. Further, when the upper die mounting part 4 is at the uppermost position or the lowermost position, the pivot shaft 16 between the mounting part 11 and the connecting rod 12, the pivot shaft 15, and the fixed shaft 14 are on the vertical axis. Become.

Thus, the first electrode rods 3 are attached to the upper mold attachment part 4 via the first electrode rod unit 17. That is, the first electrode unit 17 is connected to the metal base 1.
8, and a metal electrode rod mounting block 19 for attaching the first electrode rod 3 to the base 18, and the electrode is attached to the periphery of the base 18 using a fixing tool consisting of a plurality of fixing screws, etc. (not shown). It is attached to the lower surface of the plate 10.

Further, as shown in FIG. 3, the first electrode rod 3 is supported by a mounting block 19 in a cylindrical structure so as to be movable up and down. That is, the first electrode rod 3 includes an electrode rod main body 24 made of chromium copper or the like with a large diameter portion 23 formed on the base end side, and a tip member 25 attached to the tip of the electrode rod main body. A sliding member 30 made of ceramics having electrical wire insulation, wear resistance, and heat resistance is fitted onto the outer peripheral surface of the diameter portion 23 to form a piston portion. The piston portion 20 is slidably fitted into a cylinder chamber 22 formed above the hole 21 inside the mounting block 19. Furthermore, a sliding contact member 31 similar to the sliding contact member 30 described above is fitted onto the outer circumferential surface of the electrode rod main body 24 other than the tip side. Furthermore, a cylindrical insertion member 50 on which the sliding contact member 31 of the electrode rod main body 24 can slide is installed below the hole 21 .

The first electrode rods 3 are connected with a fluid pressure mechanism M that moves the first electrode rods 3 up and down. That is, a hydraulic passage 51 is formed in the mounting block 19 to communicate and connect each hole 21, and this hydraulic passage 51 is also connected to a small cylinder chamber 52 provided in the mounting block 19. Then, constant air pressure is constantly applied to the piston 53 in the small cylinder chamber 52 from the opening 54, the piston 53 is pushed in the direction of arrow C, and the communication port 55 of the hydraulic path 51 is closed with the piston 53. let Further, a certain amount of oil is sealed in the hydraulic path 51. Furthermore, a pressure chamber 26 is formed in the block 19 and is connected to the cylinder chamber 22, and a hole 29 that opens toward the pressure chamber 26 is formed in the first electrode rod 3.
9, a pipe 28 installed in the wall of the pressure chamber 26
Insert.

Further, the tip end side of the first electrode rod 3 is connected to the conductive cable 3
2 is also directly connected to a mounting block 19 as an electrode.

When water is poured into the pressure chamber 26 from the side hole 27 through the pipe 28 and the hollow part 29 of the first electrode rod, the first electrode rod 3 moves forward due to the water pressure, and the piston in the small cylinder chamber 52 moves forward. 53 moves as shown by arrow B. Then, when water is caused to flow from the pressure chamber 26 to a fluid discharge path (not shown) and the water pressure is released, the piston 53 moves as shown by arrow C, and the first electrode rod 3 retreats, as shown in FIG. Return to original state.

Similarly to the upper mold mounting part 4, the lower mold mounting part 6 also consists of a base plate 33 and an electrode plate 35 attached to the upper surface of the base plate 33 via an insulating plate 34. It is fixed nearby.

The second electrode rods 5 form an upper and lower pair with the first electrode rods 3, and are attached to the lower mold attachment part 6 via the second electrode rod unit 36. That is, the first electrode rod unit 36 consists of a metal base 37 and a mounting block 38 for attaching the second electrode rod 5 to the base 37, and includes a plurality of fixing blocks (not shown) on the periphery of the base 37. It is attached to the upper surface of the electrode plate 35 using a fixture made of screws or the like. Note that the second electrode rod 5 is fixed, and in the illustrated example, the second electrode rod 5 is connected to the electrode rod unit 1.
Two electrode rods 7 and 36 are provided, and two electrode rods 3 and 5 are provided. Also,
The base 37 of both second electrode rod units 36, 36 is shared.

39, 39 is the base 3 of the second electrode unit 36
The male guide part 4 is installed upright on the upper die mounting part 7, and the female guide part 4 is attached to the lower surface of the insulating plate 9 of the upper die mounting part.
A fitting member 41 that can be fitted to a cylindrical body 42
It has an elastic member 43 on the upper part thereof so as to be movable up and down. The male guide part 39 and the female guide part 40 make it possible to accurately align the upper and lower electrode rod units 17 and 36 with each other, and also to easily attach them to the respective electrode plates 3 and 5. can.

Further, a welding transformer 44 for supplying secondary current to the electrode rods 3 and 5 is fixed to the upper surface of the base plate 8 of the upper die mounting portion 4. The positive side of the secondary electrode of the transformer 44 and the first electrode on the right side of the figure
Electrode plate 10 to which electrode rod unit 17 is attached
and are electrically connected via a cable 45, and the negative side of the second electrode of the transformer 44 and the electrode plate 10 to which the first electrode rod unit 36 on the left side is attached are electrically electrically connected via a cable 46. Note that the pressure chambers 26 of the left and right first electrode rod units 17,
26 are communicated through a communication tube 47, and the left and right electrode rod units 17, 17 are insulated. Furthermore, the left and right second electrode rod units 36, 3
6 is electrically connected, and the male guide parts 39, 39 and the female guide parts 40, 40 are insulated from both electrode rod units 17, 36. Cables 48 and 49 supply primary current to the transformer 44.

Next, a method for welding a workpiece w using the welding apparatus configured as described above will be described.

First, the work w is placed on the second electrode rod 5...
The upper mold mounting part 4 is lowered by the crank mechanism 7.
In this case, no pressing force is applied to the workpiece w. Then, at the lowest position of the upper mold attachment part 4, water is supplied to the pressure chamber 26 to press each electrode rod 3 downward, so that each electrode rod 3 is brought into pressure contact with the workpiece w and a pressing force is applied to the workpiece w. Add.

In this state, if a secondary current is caused to flow from the transformer 44 to the right electrode plate 10, the current flows to the first electrode bar 3 via the conductive cable 32, and also flows to the right electrode plate 10 via the work w. It flows to the second electrode rod 5 of the two-electrode rod unit 36. Further, the current flows to the second electrode rod 5 of the second electrode rod unit 36 on the left side, and passes through the work w to the first electrode rod unit 36 on the left side.
It flows to the first electrode rod 3 of the electrode rod unit 17. Therefore, the work w can be welded.

The present invention is not limited to the illustrated embodiment, and the design may be changed without departing from the gist of the present invention. For example, the number of electrode units 17 and 36 may be increased or decreased, and the number of electrode units 3 and 5 may be increased or decreased. You can freely increase or decrease the amount. Further, when the electrode rod units 17 and 36 are a pair, if the first electrode rod 3 side is set to the positive side, the second electrode rod 5 side may be set to the negative side. Furthermore, the number of transformers 44 may be two or more depending on the electric capacity of welding.

〔Effect of the invention〕

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

The pressing force is applied to the workpiece w by pressing the first electrode rod 3 downward by the liquid pressure mechanism M, and is not done by lowering the upper mold mounting part 4. Therefore, the crank mechanism 7 is only connected to the upper die mounting portion 4.
This crank mechanism 7 only needs to be moved up and down.
A small motor may be used to drive the . That is, the welding apparatus as a whole can be made more compact, and the power consumption can also be reduced.

Furthermore, when welding the workpiece w, the upper mold attachment part 4 is at the lowest position, that is, the bottom dead center of the crank mechanism, so the crank mechanism 7 cannot sufficiently withstand the pressing force from the workpiece w. It is highly durable.

Furthermore, since each electrode rod 3 can move up and down and is connected to the fluid pressure mechanism M, the pressing force applied to the workpiece w by each electrode rod 3 can be made equal.

[Brief explanation of drawings]

FIG. 1 is a front view showing one embodiment of the present invention;
FIG. 2 is a partially omitted front view showing the welded state, and FIG. 3 is an enlarged sectional view of the main part. 3...First electrode rod, 4...Upper mold attachment part, 5...
Second electrode rod, 6...lower mold attachment part, 7...crank mechanism, w...work.

Claims (1)

[Scope of Claims] 1. An upper die attachment part 4 to which a plurality of first electrode rods 3 are attached, and a lower die attachment part 6 to which a plurality of second electrode rods 5 are attached; In a welding device that welds a workpiece w by interposing a workpiece w between the first electrode rod 3 and the second electrode rod 5, a crank mechanism 7 for vertically moving the upper mold attachment part 4 is used. are attached to the upper mold attachment part 4, and the first electrode rods 3 are movable up and down, and the first electrode rods 3 are moved downward at the lowest position of the upper mold attachment part 4. A welding device characterized in that a fluid pressure mechanism M is connected to the first electrode rods 3 for pressing the first electrode rods 3 into pressure contact with the work w.