JPS595508Y2 - Spot welding equipment for perforated parts - Google Patents

Description

[Detailed description of the invention] The present invention is a spot welding device for perforated parts, which welds perforated parts in accordance with the holes of continuously supplied parts. It is suitable for continuous welding of hole parts.

Conventionally, when welding a small perforated part such as a nut to fit the hole of a part whose bottom has been shaped by a press, etc., the part W is attached to a reference pin P provided on the lower electrode DO of a spot welding machine, as shown in Fig. 1a. and the perforated part N are fitted, and the upper electrode is lowered to apply pressure between the part W and the perforated part N, and the upper electrode and the lower electrode DO are connected via the part W and the perforated part N. A large current is passed between the part W and the perforated part N.
These are welded together, and the work is done entirely by hand or by using a feeding device that supplies only the perforated part N to the reference pin P.

However, in recent years, the production volume per unit time has increased with the development of so-called progressive presses, which are a combination of a material supply device called a roll feed device and a press machine that can perform continuous processing in a short time.

However, conventional welding equipment cannot keep up with the production speed, and it is necessary to install a plurality of welding equipment, resulting in an increase in the number of workers, working time, and installation space.

In addition, conventional devices have drawbacks such as not only the above-mentioned time and space losses, but also poor welding or misaligned welding due to shunting of the welding current, which is inconvenient in the welding position.

That is, as shown by the arrow in Figure 1a, when the upper electrode is lowered to pressurize the component W and the perforated component N and apply current to weld them, a part of the large current flows into the area indicated by the arrow. In many cases, the current is shunted from the upper electrode via the perforated part N to the reference pin P of the lower electrode DO.

Generally, the current used for spot welding is very large, and even if 1% of the current is shunted, the amount of heat generated by the shunt is considerable.

Therefore, if the shunt is large, welding defects will occur between the part W and the perforated part N, and the perforated part N and the reference pin P
and are welded together.

In addition, even if the shunt is small, the perforated part N and the reference pin P
and are welded together, making it impossible to remove the processed part W from the reference pin P.

Therefore, the occurrence of shunt flow not only causes welding defects, but also causes severe wear on the reference pin P, requiring frequent replacement of the reference pin P.

In addition, when welding the Nara L-T to the component W, since the diameters of the pilot hole of the component W, the hole, and the nut T are different, the welding must be performed with misalignment as shown in Figure 1. A welding failure occurred in which the bolt could not be screwed into the nut T later.

Moreover, in the conventional device, when the perforated component N is supplied to the reference pin P of the lower device DO by the supply device, the first
As shown in Figure C, the perforated part N is sometimes supplied in a state leaning against the reference pin P, so that
The fitting between the pin P and the reference pin P did not work properly, so the work had to be done by manually fitting it again.

As mentioned above, with conventional equipment, not only is the work speed slow and production efficiency is low, but also the welding current is shunted or the parts with holes are
There were various defects due to poor welding of the pipe due to misalignment between the pipe and the part W.

SUMMARY OF THE INVENTION The present invention aims to overcome the drawbacks of the conventional welding apparatus and provide a device that can perform welding work quickly and reliably.

The details of the present invention will be explained below based on the embodiments shown in FIGS. 2 to 6.

As shown in FIGS. 2 and 3, the device of this embodiment is attached to a so-called progressive type press 7, and a nut 6 is welded to fit into a through hole 50 of a workpiece 5 sent from the press 7. This will be explained based on an example used in the following.

The press machine 7 presses a steel plate 70 that is continuously supplied from a roll feed device (not shown) to form a workpiece 5.
This is a progressive type press machine that delivers the workpiece 5 to a conveyance chute 3 after manufacturing the workpiece 5, and the workpiece 5 is delivered in a fixed size.

The apparatus of the present embodiment has l pairs of upper electrodes 10 coaxially fixed to each other and lower electrodes 11 movably mounted on a main body 1 with a conveyance chute 3 in between.

As shown in FIGS. 3 and 4, the upper electrode 10 is placed and fixed to the lower end surface of the support part 1a provided on the main body 1 in a state of protruding downward. The lower end surface is formed into a flat surface to match the upper end surface of the workpiece 5.

Further, the upper electrode 10 is provided with a hole 13 having a stepped portion at its center and penetrating from the upper end surface toward the lower end surface.

The hole 13 has a large diameter part on the upper end surface side and a small diameter part on the lower end surface side, and the guide bushing 14 is fitted into the large diameter part, and the small diameter part is the large diameter part of the rod 20 of the positioning cylinder 2, which will be described later. Form it slightly larger than 21.

A guide hole 140 is passed through the guide bush 14 coaxially with the hole 13, and its inner diameter is sufficient for the rod 20 of the positioning cylinder 2, which will be described later, to be guided and slid in the guide hole 140. It's the size.

Note that the support portion 1a of the main body 1 is provided with a support hole 1b that penetrates coaxially with the hole 13.

Further, in order to electrically insulate between the upper electrode 10 and the support portion 1a or the guide bush 14, the support portion 1a and the guide bush 14 are formed of an insulator such as resin.
In addition to maintaining the insulation, an electrically insulated space is formed within the guide hole 140 of the guide bush 14.

On the other hand, as shown in FIGS. 2 to 4, the lower electrode 11 is electrically insulated and fixed to the tip of a rod of a pressure cylinder 12 fixedly held at the lower part of the main body 1.

The lower electrode 11 is always located opposite to the upper electrode 10 at a constant distance from the upper electrode 10, and
It is arranged coaxially with the hole 13 of 0.

Further, the upper end surface 110 of the lower electrode 11 forms a plane on which the nut 6 is placed, and this plane is kept parallel to the lower end surface of the two-part electrode 10, and at the center of the lower electrode 11, An escape hole 15 is bored from the upper end surface 110, and the escape hole 15 is formed coaxially with the hole 13 of the upper electrode 10.

The pressurized cylinder 12 uses a known air cylinder.

Note that the upper electrode 10 and the lower electrode 11 are connected to a power supply unit (not shown) that supplies a large current via a control unit (not shown), and the upper electrode 10, the lower electrode 11, and the pressure cylinder 12 This constitutes an electric resistance welding machine, a so-called spot welding machine.

Next, as shown in FIGS. 3 and 4, a positioning cylinder 2 is fixed to the support portion 1a of the main body 1 coaxially with the upper electrode 10 and the lower electrode 11, and the rod of the positioning cylinder 2 is 20 side end into the support hole 1 of the support part 1a.
b to position it.

The rod 20 of the positioning cylinder 2 consists of a large diameter part 21 and a small diameter part 22 provided at its tip, and the connecting part between the large diameter part 21 and the small diameter part 22 and the open end of the small diameter part 22 form an inclined surface. ing.

The large diameter portion 21 of the rod 20 has an outer diameter sufficient to slide within the guide 7L140 of the guide bush 14 and skewer the through hole 50 of the work 5 to position the work 5.

Further, the small diameter portion 22 of the rod 20 is smaller than the large diameter portion 21 and has an outer diameter sufficient to skewer the lower screw hole of the nut 6 and position the nut 6.

Therefore, the positioning cylinder 2, the upper electrode 10 and the lower electrode 11 are arranged coaxially, that is, the rod 20 is arranged on the axis of both electrodes 10.11, and when the rod 20 of the positioning cylinder 2 is lowered, The tip of the small diameter portion 22 of the rod 20 is provided so as to be located within the escape hole 15 of the lower electrode 11.

Note that the rod 20 of the positioning cylinder 2 normally has the tip of its small diameter portion 22 aligned with the guide hole 14 of the guide bush 14.
0, and is provided to maintain electrical insulation.

Further, the positioning cylinder 2 is a known air cylinder having a pair of suction and discharge ports, each of which has a pair of suction and discharge ports (not shown).
is in communication with a compressed air supply source (not shown) via a controller (not shown).

As mentioned above, the conveyance chute 3 is arranged between the upper electrode 10 and the lower electrode 11, and the workpieces 5 sent in fixed sizes from the press machine 7 are arranged and placed on the conveyance chute 3. has been done.

As shown in FIG. 3, the transport chute 3 is equipped with guide walls 30 on both sides to maintain the posture of the workpiece 5.
A cutout hole 31 is provided at a position corresponding to the hole 13 of the upper electrode 10 and the lower electrode 11, and the cutout hole 31 has a size sufficient for the lower electrode 11 to place and pass through the nut 6. .

Note that the cutout hole 31 is arranged in a position that does not change its attitude relative to the workpiece 5.

The positional relationship between the transport chute 3 and the upper electrode 10 is such that the workpiece 5 always stops at a position corresponding to the upper electrode 10 according to the feed of the press machine 7, and the through hole 50 of the workpiece 5 and the upper electrode 10
The axes of the workpiece 5 and the hole 13 coincide with each other, and the distance between the upper end surface of the workpiece 5 provided with the through hole 50 and the lower end surface of the upper electrode 10 is the same as that required for the workpiece 5 to move under the upper electrode 10. In order to occupy the smallest space, the transport chute 3 and the upper electrode 10
and the distance between the two.

In the device of this embodiment, the above-mentioned space is about 1 to 2 mm.

The positional relationship between the transport chute 3 and the lower electrode 11 is such that the lower electrode 11 is always located below the notch hole 31 as shown in FIG. is formed.

Note that the transport chute 3 is made of an insulator such as resin in order to maintain electrical insulation.

Next, a supply chute 4 for nuts 6, whose one end is connected to a nut supply device (not shown) such as a parts feeder, is fixed to the lower end surface of the conveyance chute 3.

The supply chute 4 has a support hole 40 formed at its tip, one of which communicates with the cutout hole 31 of the conveyance chute 3, and the other of which opens downward in FIG.

The lower electrode 11 slides inside the support hole 40, and the lower electrode 11 is normally located within the support hole 40.

Further, the supply chute 4 is provided with a passage 41 through which the nuts 6 are fed continuously and in a string from the nut supply device, with one end thereof communicating with the support hole 40 , and the lower electrode 11 is located within the support hole 40 . At this time, the lower end surface of the passage 41 is at the same position as the upper end surface 110 of the lower electrode 11, and the nut 6
can be transferred from the passage 41 onto the upper end surface 110 of the lower electrode 11.

Note that the inner wall of the support hole 40 corresponding to the passage 41 in communication serves as a stopper portion for the nut 6, and one nut 6 is inserted into the lower screw hole of the nut 6 on the upper end surface 110 of the lower electrode 11. The axes of the lower electrode 11 and the escape hole 15 of the lower electrode 11 are aligned to ensure that the lower electrode 11 is placed thereon.

Further, as shown in FIG. 4, an inclined surface 111 is formed at the tip of the lower electrode 11 corresponding to the passage 41, and as shown in FIG. The stopper surface used to stop the machine is a formal example.

The supply chute 4 is made of an insulator such as resin in order to electrically insulate the portion in contact with the lower electrode 11.

As described above, the apparatus of this embodiment positions the workpiece 5 fed by a fixed length and the nut 6 fed from the feeding device between the upper electrode 10, which is a fixed electrode, and the lower electrode 11, which is a moving electrode. At the same time, the rod 20 of the positioning cylinder 2 provided on the through hole 50 of the workpiece 5, the screw lower hole of the nut 6, and the upper electrode 10 side is positioned coaxially, and the rod 20 skewers the workpiece 5 and the nut 6. After positioning, the lower electrode 11 is moved and the workpiece 5 and the nut 6 are integrally welded together by spot welding, that is, electric resistance welding.

Note that the original position of the device of this embodiment is as shown in FIG.
The lower electrode 11 is located at the lower end, and its upper end surface 110 is located within the support hole 40 of the supply chute 4, and the upper end surface 110 and the lower end surface of the passage 41 are at the same position.

Further, the rod 20 of the positioning cylinder 2 is located at the rising end, and its tip end is connected to the guide hole 14 of the guide bush 14.
It is located inside and maintains electrical insulation.

Next, the operation of the apparatus of this embodiment having the above configuration will be explained.

First, the workpiece 5 processed by the press machine 7 is
It is continuously fed out onto the conveyance chute 3 by constant feed.

Further, the nuts 6 are continuously fed out from the nut feeding device in a chain and are always located at the tip of the passage 41 of the feeding chute 4.

Therefore, when the lower electrode 11 is located at the lower end, one nut 6 is pushed out by the following nut and transferred from the passage 41 onto the upper end surface 110 of the lower electrode 11, and one nut 6 is placed on the upper end surface 110 of the lower electrode 11. is positioned and placed.

In the above state, when the workpiece 5 moves on the transport chute 3 in the direction of the arrow in FIG. Compressed air is supplied from a source to operate the placement cylinder 2, and the rod 20 is guided by the guide bush 14 and lowered.

As the rod 20 descends, the rod 20 successively skewers the workpiece 5 on the conveyance chute 3 and the nut 6 placed on the upper end surface 110 of the lower electrode 11, as shown in FIG. It is located within the escape hole 15 of the lower electrode 11.

That is, the large diameter portion 21 of the rod 20 engages with the through hole 50 of the work 5 to position the work 5.

Further, the small diameter portion 22 of the rod 20 engages with the lower screw hole of the nut 6, and the stepped portion, which is the connecting portion between the large diameter portion 21 and the small diameter portion 22, connects the nut 6 to the upper end surface 11 of the lower electrode 11.
0 to position and fix the nut 6.

Therefore, the rod 20 reliably maintains the coaxial positional relationship between the through hole 50 of the workpiece 5 and the lower screw hole of the nut 5.

Note that when the rod 20 skewers the workpiece 5 and the nut 6 one after another, the rod 20, the workpiece 5, and the nut 6
are positioned coaxially, and an inclined surface is formed at the connection part between the large diameter part 21 and the small diameter part 22 of the rod 20 and at the opening of the small diameter part 22, so that the through hole 50 between the large diameter part 21 and the workpiece 5 is formed. Alternatively, the engagement between the small diameter portion 22 and the lower screw hole of the nut 6 is performed smoothly.

Next, when the workpiece 5 and the nut 6 are coaxially positioned by the rod 20, the pressure cylinder 12 is activated to raise the lower electrode 11 in the direction of the arrow, as shown in FIG.

The lower electrode 11 places the nut 6 and rises, bringing the nut 6 and the workpiece 5 into contact.

Furthermore, the lower electrode 11 is connected to the nut 6 while maintaining the corresponding contact.
The workpiece 5 is placed thereon and raised, and the upper end surface of the workpiece 5 is brought into contact with the upper electrode 10.

Thus, the workpiece 5 and the nut 6 are integrally held between the upper electrode 10 and the lower electrode 11, and the lower electrode 1
1 and is pressurized by a pressurizing cylinder 12.

Note that when the lower electrode 11 is raised, the workpiece 5 and the nut 6 remain coaxially skewered by the rod 20 of the positioning cylinder 2.

Therefore, the workpiece 5 and the nut 6 are held between the upper electrode 10 and the lower electrode 11 while the through hole 50 of the workpiece 5 and the screw lower hole of the nut 6 are held coaxially.

In addition, when the lower electrode 11 is raised, the following nut 6
0 is positioned at the tip of the passage 41 by the inclined surface 111, and is held in that position by contacting the outer peripheral surface of the lower electrode 11.

While the lower electrode 11 is rising, the positioning cylinder 2 has all its suction and discharge ports communicating with the atmosphere, so there is no obstruction to the rise of the lower electrode 11, and the lower electrode 11
As the rod 20 of the positioning cylinder 2 is raised, the rod 20 of the positioning cylinder 2 is guided by the guide bush 14 and pushed up by the lower electrode 11 while maintaining the skewered state of the work 5 and the nut 6.

Subsequently, the workpiece 5 and the nut 6 are held between the electrodes 10 and 11, and at the same time compressed air is supplied to the positioning cylinder 2, and the rod 20 returns to the rising end as shown in FIG. Guide bushing 1, which is an electrically insulating space
It is located within the guide hole 140 of No. 4.

Thus, a large current is supplied between the upper electrode 10 and the lower electrode 11 from the power supply section.

The large current flows through both electrodes 10.1 through the workpiece 5 and the nut 6.
1, the workpiece 5 and the nut 6 are welded together by spot welding, that is, electric resistance welding.

The workpiece 5 and the nut 6 are welded together while the through hole 50 of the workpiece 5 and the threaded lower hole of the nut 6 are held coaxially, and the pressure cylinder 12 applies sufficient pressure to the workpiece 5. and the nut 6.

That is, the workpiece 5 and the nut 6 are skewered on the rod 20 of the positioning cylinder 2 until just before welding, and are held between the electrodes 10 and 11, and sufficient pressure is applied by the pressure cylinder 12. There is.

Therefore, even if the rod 20 of the positioning cylinder 2 is located at the rising end and the workpiece 5 and the nut 6 are released from the skewered state during welding of the workpiece 5 and the nut 6, the through hole 50 of the workpiece 5 and the nut 6 The coaxial state with the lower screw hole is reliably maintained.

Moreover, when welding the workpiece 5 and the nut 6, the rod 20 of the positioning cylinder 2 returns to the rising end as described above while maintaining the clamping force due to the pressure of the pressure cylinder 12, and its tip end is connected to the guide bush 14. Due to the position within the rod 20, a large current flows reliably between the two electrodes 10, 11 via the workpiece 5 and the nut 6, and no current is shunted from the rod 20.

Therefore, a sufficiently large current and pressure are applied to the workpiece 5 and the nut 6, and reliable welding is performed.

Next, when welding of the workpiece 5 and the nut 6 is completed, the lower electrode 11 descends and returns to its original position, which is the lowering end.

When the lower electrode 11 is lowered, the lower electrode 11 is attached to the nut 6.
The welded workpiece 5 is placed thereon, and after the workpiece 5 is placed on the conveyance chute 3 again, it returns to the lowering end.

By this return, the operation of the apparatus of this embodiment is completed, and the succeeding nut 60 is immediately transferred from the passage 41 of the supply chute 4 onto the upper end surface 110 of the lower electrode 11 located at the lower end in preparation for the next welding. .

It should be noted that all the operations of the apparatus of this embodiment described above are performed continuously within a short period of time.

That is, the feed completion signal of the workpiece 5 → the positioning cylinder 2 lowering (completion signal) → the lower electrode 11 raising (completion signal) →
Positioning cylinder 2 rise (completion signal) → Welding current supply (
Completion signal) → lower electrode 11 lowering (completion signal) → work 5
This is done continuously and reliably while receiving a completion confirmation signal.

By the way, the above-mentioned welding work in the device of this embodiment is usually performed in 1 step.
．． It can be done in 5 seconds.

If the apparatus of this embodiment is used as described above, compared to the conventional apparatus in which the nut is supplied to the core of the electrode manually or by a nut supplying device, and then the electrode is moved to weld the nut and the workpiece. Since nut supply and workpiece supply can be performed almost simultaneously, welding work can be completed in a short time and continuous work can also be performed.

By the way, if the device of this embodiment is installed in conjunction with a machine with a fast processing tact such as a progressive press machine, welding work can be carried out in accordance with the production speed of the machine, and there is no need to install a large number of welding machines as in the past. Since there is no space required, it is also possible to save space and labor.

In addition, the through hole 50 of the workpiece 5 and the screw lower hole of the nut 6 are coaxially positioned, and the rod of the positioning cylinder 2 is positioned coaxially until the workpiece 5 and the nut 6 are held between the electrodes 10 and 11. 20, it is possible to prevent out-of-center welding and to reliably weld the workpiece 5 and the nut 6 while holding the through hole 50 and the screw lower hole coaxially.

Further, during welding, the rod 20 of the positioning cylinder 2 is located within the guide bush 14 made of an insulator, and only the workpiece 5 and the nut 6 are present between the electrodes 10 and 11. Therefore, current shunt from the core metal of the electrode does not occur as in the conventional case.

Therefore, a sufficiently large current is applied to the workpiece 5 and the nut 6, and a sufficient pressing force is applied to the pressurizing cylinder 12, so that reliable welding work with stable quality can be performed.

In addition, the nut 6 is supplied to the lower electrode 11 by moving from the passage 41 of the supply chute 4 onto the upper end surface 110 of the lower electrode 11, in contrast to the conventional mechanism in which the nut 6 is inserted into the core of the electrode. This can be done reliably because they simply move on the same plane.

In this embodiment, the supply chute 4 has a support hole 40.
The nut 6 was positioned and placed on the upper end surface 110 of the lower electrode 11 by providing an inner wall thereof as a stopper portion of the nut 6 and slidingly fitting the lower electrode 11 into the support hole 40. As shown in FIG. 7a, l), the upper end surface 1 of the lower electrode 11 excluding the communication part with the passage 41 of the supply chute 4
A stopper portion 112 corresponding to the shape of the nut 6 is provided around the nut 10.
may be formed integrally with the lower electrode 11.

In this case, the workpiece 5 to which the nut 6 is welded is attached to the lower electrode 1.
When the nut 6 is lowered while being placed on the nut 1 and placed on the conveyance chute 3 again, the stopper portion 112 guides the nut 6, so that this can be done reliably.

When the nut 6 is placed on the upper end surface 110, about half of the upper part of the nut 6 is attached to the stopper part 112.
12 is provided to protrude from the upper end surface of the supply chute 4, and a stopper portion 112 is provided with an inclined surface 113 at a communication portion with the passage 41 of the supply chute 4, so that the nut 6 can be easily transferred from the passage 41 to the lower electrode 11.

In this embodiment, the rod 20 of the positioning cylinder 2 is fitted into the large diameter portion 21 that slides into the through hole 50 of the workpiece 5, and the nut 6
It is formed from a small diameter portion 22 that slides into the lower screw hole of
As shown in FIG. 8, the outer diameter of the rod 20 is inserted into the through hole 50.
A conical part 220 is formed at the open end of the rod 20, and the conical part 220 and the threaded lower hole of the nut 6 are engaged to coaxially position the workpiece 5 and the nut 6. You may.

In addition, in the present embodiment, the nuts 6 are continuously supplied from a nut supply device such as a parts feeder in a daisy chain,
When the nut 6 is transferred from the supply chute 4 onto the upper end surface 110 of the lower electrode 11, the nut 6 is pushed by the following nut and is also pressed against the inner wall of the support hole 40 for positioning. As shown in FIGS. 9a and 9l, the nuts 6 that are continuously supplied may be placed and positioned one by one on the upper end surface 110 of the lower electrode 11 by the cylinder 8.

In this embodiment, the fixed-size feed mechanism of the progressive press machine 7 is used to feed the workpiece 5 at a fixed size, but any fixed-size feed mechanism may be used. It is sufficient that the workpiece 5 is reliably stopped at a position where the through hole 50 of the positioning cylinder 5 and the rod 20 of the positioning cylinder 2 engage with each other.

Furthermore, in the device of this embodiment, the fixed electrode 10 is provided at the top and the movable electrode 11 is provided at the bottom, but it is also possible to provide a movable electrode at the top and a fixed electrode at the bottom.

In this case, it is best to provide the positioning cylinder 2 on the fixed electrode side.

In the above case, the supply chute 4 for the nut 6 is provided immediately below the upper movable electrode, and the nut 6 is held coaxially with the rod 20 of the positioning cylinder 2 at the tip of the supply chute 4. A temporary locking mechanism for the nut 6 must be provided to prevent the nut 6 from falling downward.

In this embodiment, the rod 20 is moved up and down using an air cylinder in which the positioning cylinder 2 is provided with a pair of suction and exhaust ports communicating with a compressed air supply source. An air cylinder connected to a compressed air supply source is used in the cylinder chamber on the side where the spring is installed and the rod 20 is raised, and the lowering of the rod 20 is performed by the elastic force of the spring, and the workpiece 5 and the nut 6 are both held together. After being sandwiched between the electrodes 10 and 11, the rod 20
When the pressure rises, compressed air may be used.

Furthermore, in the present embodiment, each operation was performed while receiving a completion confirmation signal, but the lower electrode 11 was raised to clamp the workpiece 5 and the nut 6 between the upper electrode 10 and welded, and then lowered. An electric timer may be used to perform the interval between the two, and the point is that the rod 20 of the positioning cylinder 2 skewers the work 5 and the nut 6 until the work 5 and the nut 6 are sandwiched between the electrodes 10 and 11. , including control for positioning the tip end of the rod 20 within the guide hole 140 of the guide bush 14, which is an electrically insulating space, during welding,
Any type of control device may be used as long as all operations are completed continuously and within a short period of time.In short, the present invention holds one of the control devices fixedly and the other movably, and also In a spot welding device comprising a pair of coaxially opposed electrodes 10.11,
A rod 20 is provided so as to be movable back and forth along the axis of both electrodes 10.11 from the fixedly held electrode 10 side. When the rod 20 moves forward, it is provided so as to extend between the two electrodes 10.11, and when it retreats, it moves. Both electrodes 10.11 are provided so as to be retracted to a certain position together with the electrode 11 that can be held.
The rod 20 is provided to be located in the electrically insulating space 140 when the rod 20 is energized, and the rod 2
With 0 skewered and positioned, both electrodes 10.11
This spot welding apparatus for a perforated part is characterized in that the workpiece 5 and the perforated part 6 are welded together by energizing both electrodes 10 and 11 after being held between them.

The present invention has the above-mentioned configuration, so that the welded object'JI! I.J.
5 and the perforated part 6 can be supplied almost at the same time, etc., and the processes in the conventional apparatus can be shortened or overlapped, so that the work speed is high.

In addition, since the object to be welded 5 and the perforated part 6 can be held between both electrodes 10 and 11 while being skewered by the rod 20, accurate welding work can be performed, and the rod 20
0 is located in the guide hole of the guide bush 14, which is an electrically insulating space, so that the object to be welded 5 is placed between the two electrodes 10 and 11.
and the perforated part 6 are present, and no branching of the welding current occurs.

Therefore, the present invention can provide a welding device that can perform high-quality welding work.

[Brief explanation of the drawing]

Figures 1a, 1) and 1c are diagrams showing the drawbacks of conventional welding equipment. 2 to 9 each show an embodiment of the present invention, in which FIG. 2 shows an embodiment used in combination with a progressive press machine, and FIG. An enlarged view showing the X cross section, and FIGS. 4 to 6 are views showing the YY cross section in FIG. 3, and both are views showing the operation of the embodiment. FIGS. 7a and 7l) are diagrams showing another embodiment, and FIG. 7 is a diagram showing a Z-Z cross section in FIG. 7a. Moreover, both FIG. 8 and FIG. 9 are diagrams showing another embodiment. 1... Main body, 2... Positioning cylinder, 3... Transfer chute, 4... Supply chute, 5... Workpiece, 6... ... Nut, 10 ... Upper electrode, 11 ... Lower electrode, 20 ... Rod, 40 ... Support hole, 41 ... ...Aisle, 110...Top end surface.

Claims (1)

[Claims for Utility Model Registration] In a spot welding device comprising a pair of electrodes 10 and 11, one of which is held fixedly and the other is movably held and coaxially opposed to each other, the fixedly held electrode is A rod 20 is provided so as to be movable back and forth along the axis of both electrodes 10.11 from the 10 side, and is provided so as to extend between both electrodes 10.11 when the rod 20 moves forward, and when it retreats,
The rod 20 is provided so as to be retracted to a certain position together with the movably held electrode 11, and when both electrodes 10.11 are energized, the rod 20 is provided so as to be located in the electrically insulating space 140, and the axis between the two electrodes 10.11 is provided. Welded object 5 fixed on the core wire
With the rod 20 skewering and positioning the rod 20 and the perforated part 6, they are held between both electrodes 10.11, and then both electrodes 10.11 are energized to connect the workpiece 5 and the perforated part 6. A spot welding device for perforated parts that performs welding.