JPH0442119B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a resistance welding device, and more particularly to a resistance welding device capable of continuous multi-point welding.

(Prior Art and its Problems) Conventionally, when performing multi-point welding with a general resistance welding device, a method is adopted in which the workpiece and the member to be welded are sequentially fed according to the number of welding points. However, with this method,
It requires a precision positioning device for the workpiece, and since positioning takes time, it cannot be increased in speed.Furthermore, the electrode has a large number of dots, so its life is short. For this reason, it is conceivable to install a large number of upper and lower electrodes for welding, and sequentially weld the workpiece fed between them and the parts to be welded, but in this case, each welding electrode is controlled individually. Since a device is required, the resistance welding device becomes large-scale, and operation control is difficult, making it impractical.

Therefore, a large number of welding electrodes can be controlled with one control device.
A resistance welding device that operates by switching a changeover switch has been proposed. However, in this resistance welding device, when a large number of welding electrodes and a control device are successively connected by switching a changeover switch, the contact portions are worn out, and high-speed switching is difficult. Moreover, in the case of switch semiconductors, there is no single device that can flow a large amount of current, and although it is possible to use multiple devices in parallel, this is difficult due to variations in the devices.

(Objective of the Invention) The present invention has been made to solve the above problems, and allows continuous multi-point welding by simply passing welding current from one welding control device without using a changeover switch. It is an object of the present invention to provide a resistance welding device as described above.

(Means for Solving the Problems) In order to solve the above problems, the resistance welding device of the present invention has a main disk, a contact disk, and a distributor arranged on the drive shaft, and the main disk is separate from the drive shaft. The contact disk is connected to the drive shaft, and the distributor is insulated from the drive shaft via an insulating material, and is divided into a number of parts in the circumferential direction via a thin insulating layer, and is in contact with the main disk. A plurality of contact rolls are disposed at the same plane position and rotatably supported at equal angular intervals in the circumferential direction between the disk and between the contact disk and the disk distributor, respectively, and are rotatably supported by a plurality of contact rolls arranged at equal angular intervals in the circumferential direction. An upper electrode for welding is connected to each block, and a lower electrode for welding is provided below the upper electrode for welding, and the lower electrode for welding and the main disk are electrically connected to the resistance welding device. It is connected to.

(Example) An example of a resistance welding apparatus according to the present invention will be described with reference to the drawings. Figure 1 is an exploded perspective view. 1 is a main disk made of a good conductor. Its upper surface is flat, its lower surface is tapered toward the center in an inverted conical shape as shown in Figure 2, and the center is transparent. Hole 2 is bored. Reference numeral 3 denotes a contact disk made of a good conductor, the upper surface of which is tapered toward the center in an inverted conical shape, as shown in FIG. 2, and has a through hole 4 bored in the center. 5 is a distributor whose upper surface is tapered conically toward the center as shown in FIG. 2, and whose lower surface is flat and has a through hole 6 in the center. The main disk 1, the contact disk 3, and the distributor 5 have the same diameter and are arranged on a drive shaft 7 inserted into the through holes 2, 4, and 6, respectively. The main disk 1 is fixed to a casing (not shown) and is separate from the drive shaft 7.
It doesn't rotate.

The contact disk 3 is fixed on the drive shaft 7 and rotates together with the drive shaft 7. The distributor 5 is insulated from the drive shaft 7 through an insulating material 8 and is separate from the drive shaft 7, and does not rotate. Then, the 18 blocks 5a are divided, and each block 5a is made of a good conductor. Between the main disk 1 and the contact disk 3 and between the contact disk 3 and the disk distributor 5, three conical contact rolls 10 and 1 are provided at equal angular intervals in the circumferential direction, respectively.
0' are arranged at the same plane position, and their inner end shafts are rotatably supported by the drive shaft 7 as shown in FIG. The outer end shafts of these upper and lower contact rolls 10 and 10' are supported by a connecting ring 11 as shown in FIG. An upper electrode 12 for welding is connected to each divided block 5a of the distributor 5, and a lower electrode 13 for welding is provided below the upper electrode 12, respectively. This welding lower electrode 13 and the main disk 1 are connected to the welding control device 1.
It is electrically connected to 4. The drive shaft 7 is rotated at a required speed by a drive device (not shown).

Next, the operation of the embodiment configured as described above will be explained. When the drive shaft 7 is rotated in the direction of the arrow by a drive device (not shown), the contact disk 3 integrated with the drive shaft 7 is rotated, and at the same time, when the contact rolls 10 and 10' are rotated in the direction of the arrow, the main disk 1 and the disk distributor are rotated. Each divided block 5a of 5 is
Three of them become conductive one after another. At this time, the welding control device 14 is connected to the upper welding electrode 12 through the main disk 1, the contact roll 10, the contact disk 3, the contact roll 10', and the block 5a of the distributor 5, and also directly to the welding electrode 13. Connect with. Therefore, when a workpiece is inserted between the upper electrode for welding 12 and the lower electrode for welding 13 and members to be welded are inserted into the workpiece, the members to be welded to the workpiece are successively welded to the workpiece. That is, if the angle θ of the divided block 5a of the distributor 5 is θ, and the energization time is tsec, then the revolution speed of the contact disks 10 and 10' is v<θ/tsec, so 1
When energized twice, the contact rolls 10 and 10'
The angle θ of the block 5a is rotated at a constant speed while maintaining continuity, and since the insulating layer 9 between the divided blocks 5a is as thin as 0.01 to 0.1 mm, the parts to be welded are continuously welded to the workpiece. .

In the above embodiment, the contact disk 3 is rotated by the rotation of the drive shaft 7, and the contact rolls 10 and 10' are rotated, but the contact rolls 10 and 10' may be directly driven and rotated.

Further, when the divided blocks 5a of the main disk 1 and the distributor 5 are electrically connected via the contact roll 10, the contact disk 3, and the contact roll 10', the electrical connection is made between the blocks 5a that are electrically connected. It may also be connected to a current source to allow a large current to flow. This is suitable for welding members with a large contact area.

In addition, if only a small current needs to be passed in order to weld parts with a small contact area, only one of the contact rolls 10 and 10' should be a conductor, and the others should be non-conductors.
It is preferable that the current flowing through the divided block 5a of the distributor 5 through 0' be distributed to other divided blocks 5a that are electrically connected.

(Effects of the Invention) As can be seen from the following explanation, the resistance welding device of the present invention divides the distributor into a large number of blocks in the circumferential direction via a thin insulating layer, and divides the distributed block into a large number of blocks at equal angular intervals from the main disk. Since the welding current is conducted through the contact rolls and contact disks provided at the same planar position at equal angular intervals, the welding current is passed from one welding control device and the contact rolls are connected to the contact rolls. By rotating the welding device, electricity is continuously applied to the upper electrode for welding connected to a large number of divided blocks of the distributor and the lower electrode opposite to the upper electrode for welding connected to the welding control device. Therefore, the workpiece fed in during this time and the member to be welded are continuously welded, and continuous multi-point welding is achieved, which is an excellent effect.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of an embodiment of a resistance welding apparatus according to the present invention, and FIG. 2 is a longitudinal cross-sectional view taken along line A--A of the main parts of the resistance welding apparatus of FIG.

Claims (1)

[Claims] 1 A main disk, a contact disk, and a distributor are arranged on a drive shaft, the main disk is fixed separately from the drive shaft, the contact disk is connected to the drive shaft, and the distributor is connected to the drive shaft through an insulating material. It is insulated from the drive shaft and divided into a number of blocks in the circumferential direction via a thin insulating layer, and there are equal angles in the circumferential direction between the main disk and the contact disk and between the contact disk and the disk distributor. A plurality of contact rolls are arranged at intervals in the same plane position and are rotatably supported, and an upper electrode for welding is connected to each of the many divided blocks of the distributor, and the upper electrode for welding is opposed to the upper electrode for welding. A resistance welding device is provided with a lower welding electrode provided below each of the welding electrodes, and the lower welding electrode and the main disk are electrically connected to a welding control device.