JPH0321274B2 - - Google Patents

Description

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

[Conventional technology]

Conventionally, in electric resistance welding, welding equipment that simultaneously welds multiple locations on a workpiece using multiple electrode rods has a cylinder block for mounting the electrode rod that supports the movable electrode rod so that it can move forward and backward, and a cylinder block for cooling and extrusion. A fluid supply pipe and a fluid discharge pipe are connected to each other, and a pressure intensifier is provided in the middle of the fluid supply pipe.
A switching valve (stop valve) was connected in the middle of the fluid discharge pipe. Then, the electrode rod was cooled by flowing fluid into the cylinder block through the fluid supply pipe. When the discharge path of the fluid supply pipe is closed by operating the switching valve (stop valve), the fluid pressurized by the pressure intensifier pushes the electrode rod forward, and when the switching valve is open, the electrode rod is cooled. was going there.

[Problem to be solved by the invention]

The conventional welding equipment described above requires a switching valve (stop valve) in the middle of the fluid supply pipe, and wiring and hydraulic piping to automatically open and close this valve in response to the operation of the pressure booster. There was a problem in that it required additional equipment.

An object of the present invention is to provide a welding device that solves the above problems.

[Means for solving problems]

In order to achieve the above object, the welding device of the present invention cools the electrode rod by sending fluid through a fluid supply path to the cylinder chamber of the electrode rod mounting block into which the electrode rod is inserted so as to be movable back and forth. Along with letting
A welding device comprising a pressure intensifier that pressurizes the fluid in a pressure intensifying chamber and sends it to the cylinder chamber to advance the electrode rod, the fluid return path communicating with the fluid supply path via the cylinder chamber. The pressure intensifier is disposed in the middle of the stroke, and the pressure intensifier is provided with opening/closing means for opening and closing the discharge hole of the pressure intensification chamber in the middle of the stroke, and a check valve is further disposed in the middle of the fluid supply path. It was established.

[Effect]

The fluid flows into the cylinder chamber of the electrode rod mounting block through the fluid supply path and a check valve provided in the middle thereof, cools the electrode rod, and then is discharged from the discharge hole through the fluid return path. When the pressure intensifier is activated, the discharge hole is closed by the movement of the opening/closing means, and
Since the flow of the fluid in the opposite direction is blocked by the check valve, the fluid existing in the section between the discharge hole and the discharge hole is in a sealed state and is pressurized by the pressure intensifier. This pressurized fluid is sent through the fluid return path to the cylinder chamber of the electrode rod mounting block, thereby pressing the electrode rod and moving it forward.

〔Example〕

The embodiment will be described with reference to the drawings. In FIG. 2, 1 is a press machine, and the press machine 1 has a movable side attachment part 2 for attaching the upper die and a fixed side attachment part for attaching the lower die. Part 3 is provided. The movable mounting portion 2 is vertically movable as shown by arrow A by a ram-shaped cylinder 4 attached to the body frame 54. The mounting portion 2 is attached to the cylinder 4
It consists of a base plate 5 connected to the base plate 5, and an electrode plate 7 attached to the lower surface of the base plate 5 via an insulating plate 6.
It moves up and down along a guide rail (not shown). The fixed side mounting part 3 includes a base plate 8 and an electrode plate 10 attached to the upper surface of the base plate 8 via an insulating plate 9.
It consists of

Then, the metal base 12 is fixed to the electrode plate 7 using connectors (not shown) such as screws. Electrode rod 1
3... is the mounting block 14 due to the cylinder structure.
The electrode rod unit 11 is inserted into the electrode rod unit 11 so as to be able to move forward and backward in small strokes as shown by the arrow B. The illustrated example shows two electrode rods 13, 13, of which one electrode rod 13 is attached vertically to the mounting block 14, and the other electrode rod 13 is attached to another attachment block 14 and mounted on the pedestal. 1
It is supported in an inclined manner by 5. Reference numeral 55 indicates a conductive cable, and the conductive cable 55 connects the electrode rods 13 to the electrode rod attachment blocks 14.

Reference numeral 16 denotes a lower electrode rod unit that is attached to the fixed side attachment part 3, and includes a metal base 17 and a lower electrode rod unit 18 for attaching the lower electrode rods 18 that are paired with the upper electrode rods 13 to the base 17. Mounting block 19
It is attached to the upper surface of the electrode plate 10 by fixing the base 17 with a connector (not shown) such as a screw. Note that the lower electrode rods 18 are fixed.

Reference numeral 20 denotes a lower guide member erected on the base 17 of the lower electrode rod unit 16, and upper guide members 21, which fit vertically movably into the lower guide member 20, extend downward from the base 12. It is installed vertically. With these guide members 20 and 21, the base 1
2.17 alignments can be performed. 22 is a power supply unit, and 23 and 24 are wiring cables.

25 are pressure intensifiers, and the fluid 27 can be sent from the pressure intensifiers 25 to the mounting blocks 14 through the fluid return paths 26 to advance the electrode rods 13. Reference numeral 28 denotes a fluid supply path for supplying the fluid 27, and the fluid supply path 28 is connected to the fluid return path 26 via the cylinder chamber 31 of the electrode rod mounting block 14. A check valve 30 is provided. In the illustrated example, the check valve 30 is provided inside the body 32 of the pressure booster 25. fluid 27
Use water or other liquids. Pressure booster 2
5 are attached to the base 12 or the base plate 5 directly or through other members. The illustrated imaginary line 49 is a workpiece to be welded.

As shown in FIGS. 1 and 3, the pressure intensifier 25 is equipped with an opening/closing means 34 that opens and closes the discharge hole 33 of the fluid 27 during its stroke.
Specifically, the opening/closing means 34 includes seal members 37 and 38 fitted to the inner circumferential surface 36 of the pressure intensifying chamber, and a small diameter piston portion 40 of the piston 39. The discharge hole 33 is formed in the inner circumferential surface 36 of the pressure increase chamber 35 and between both the seal members 37 and 38, and the small diameter piston portion 40 is fitted with only one of the seal members 38, that is, the first seal member 38. In the state shown in the figure, the discharge hole 33
will be released. Then, the fluid 27 is discharged from the discharge hole 33.
can be discharged. In addition, the small diameter piston portion 40
When the seal member 37 is fitted with the other seal member 37, that is, the state shown in FIG. 3, the discharge hole 33 is closed. Fluid holes 42 and 43 are formed in the front and rear parts of the large cylinder chamber 29 of the pressure intensifier 25, respectively, through which air, oil, etc. can enter and exit. By alternately introducing air at a predetermined pressure to the piston 39
reciprocate.

Restoration chamber 4 in electrode rod attachment block 14
4 is introduced with a piston return fluid 48 such as water, oil, air, gas, etc., and the restoring chamber 44 is always maintained at a constant pressure P ₀ . Note that the restoration chamber 44 is connected to the cylinder chamber 31 via the electrode rod base 46 (piston portion).
The piston is constantly pushed in the direction of . 47 is an introduction hole for the piston return fluid 48. Above pressure
P ₀ is set, for example, within a range of 4 to 25 Kg/cm ² . Note that it is also possible to install a mechanical resilient member in the restoring chamber 44 and omit the fluid 48 and the like.

As shown in FIG. 3, the electrode rod 13
The fluid 27 pressurized within the workpiece 5 flows into the cylinder chamber 31 and moves forward in the direction of arrow C.
9 and a predetermined pressure _P1 is applied thereto. During the stroke of the pressure intensifier 25, that is, while the piston 39 is moving forward in the direction of arrow D, the opening/closing means 34 closes the discharge hole 33, and the fluid 27 flows through the check valve 30.
Since the fluid cannot flow backwards, the fluid between the discharge hole 33 and the check valve 30 is sealed and pressurized. Specifically, the fluid return path 26, the cylinder chamber 31, the electrode rod hollow section 50 communicating with the cylinder chamber 31, and the pipe 5 provided in a protruding shape within the electrode rod hollow section 50.
3. The portion of the fluid supply path 28 on the downstream side of the check valve 30 is sealed, and the fluid 27 therein is pressurized by the pressure intensifier 25.

Next, as shown in FIG. 1, the fluid such as air is discharged from the fluid hole 43 of the pressure intensifier 25, and the fluid is caused to flow into the small diameter piston portion 40 side in the large cylinder chamber 29 from the fluid hole 42. As a result, the piston 39 moves in the direction of arrow E, and the opening/closing means 34
The discharge hole 33 opens, and the electrode rod 13 is pushed in the direction of arrow F by the pressure P ₀ of the piston return fluid 48 and retreats. In this state, the fluid pressure in the cylinder chamber 31 of the electrode rod mounting block 14 and the pressure intensifying chamber 35 of the pressure intensifier 25 is small, so the check valve 30 opens and the fluid 27 flows through the check valve 30, After cooling the electrode rod 13 through the fluid supply path 28, the pipe 53, and the electrode rod hollow part 50, the fluid return path 2
6. It is discharged through the pressure increase chamber 35 and the discharge hole 33.
In Figures 1 and 3, fluid holes 4 of each pressure intensifier 25...
2, 43, and the discharge holes 33, and the piping to the check valves 30, it is desirable to use common piping. However, separate piping may be used. In the above embodiment, the check valve 30
Since it is incorporated into the body 32 of the pressure intensifier 25, it is easy to handle as a unit and the piping is easy.

Since the plurality of electrode rod attachment blocks 14 and the pressure intensifiers 25 are individually attached to the base plate 12, the electrode rod unit 11 and the pressure intensifier 25 can be used as a pair for general purpose use. Therefore, these can be manufactured and sold as a set of ready-made products (general-purpose products), and mass production becomes possible.

〔Effect of the invention〕

Since the present invention is configured as described above, unlike the conventional method, a switching valve (stop valve) that operates in accordance with the stroke of the pressure booster 25 is used.
Therefore, all equipment such as wiring and hydraulic piping associated with installing the switching valve (stop valve) is unnecessary, and the device is made simpler and more compact. Furthermore, the check valve 30 allows automatic and smooth switching between the cooling and pressurizing states. Furthermore, the installation position and the number of sets of the pressure intensifier 25 and electrode unit 11 as one set can be easily changed to correspond to various press machines or workpieces, thereby streamlining the installation work and replacement work. I can do it.

[Brief explanation of drawings]

Fig. 1 is an enlarged cross-sectional view of essential parts showing an embodiment of the present invention, Fig. 2 is a partially omitted cross-sectional front view of a welding device according to the present invention, and Fig. 3 is an enlarged cross-sectional view of main parts showing a welding state. It is. 13... Electrode rod, 14... Electrode rod attachment block, 25... Pressure intensifier, 26... Fluid return path, 2
7... Fluid, 28... Fluid supply path, 30... Check valve, 31... Cylinder chamber, 33... Discharge hole, 34
...opening/closing means, 35...pressure intensification chamber.

Claims (1)

[Claims] 1. A fluid 27 is sent to the cylinder chamber 31 of the electrode rod mounting block 14 into which the electrode rod 13 is inserted so as to be movable back and forth through the fluid supply path 28 to cool the electrode rod 13, The welding device is equipped with a pressure intensifier 25 that pressurizes the fluid 27 in a pressure intensifying chamber 35 and sends it to the cylinder chamber 31 to advance the electrode rod 13, and the fluid supply path 2 is connected to the fluid supply path 2 through the cylinder chamber 31.
The pressure intensifier 25 is disposed in the middle of the fluid return path 26 communicating with the pressure intensifier 8, and the pressure intensifier 25 is provided with an opening/closing means 34 for opening and closing the discharge hole 33 of the pressure intensifying chamber 35 in the middle of the stroke. . A welding device further comprising a check valve 30 disposed in the middle of the fluid supply path 28.