JPS6228085A - Resistance welding equipment - Google Patents

Abstract

PURPOSE:To perform the continuous multipoint welding having excellent accuracy by feeding the controlled welding current to the upper electrode for welding through a distributer from center electrode via the roll electrode supported rotatably. CONSTITUTION:Roll electrode 10, 10' are rotated with being driven by rotating a ring electrode 2. The roll electrode 10 rolls on the outer peripheral face of the center electrode 1 and roll electrode 10' rolls on the inner peripheral face of the distributer 3. The divided each block 3a of the center electrode 1 and distributer 3 becomes in a conductive state in order each three pieces accordingly. In this case, a welding control unit 14 is connected to the upper electrode 12 for welding and welds continuously in order the place to be welded of a work. It is thus enabled to perform a continuous multipoint welding by using one unit of a welding control unit.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a resistance welding device, and particularly to a resistance welding device that can perform 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, this method requires a precision positioning device for the workpiece, and since positioning takes time, it is not possible to increase the speed.Furthermore, since the number of electrode points is large, the service life is short.

For this reason, we installed a large number of upper and lower electrodes for welding.
It is conceivable to sequentially weld the workpiece fed between the two and the member to be welded, but this would require a control device for each welding electrode, resulting in a large-scale resistance welding device. Operation control is also difficult and impractical.

Therefore, a resistance welding device has been proposed in which a large number of welding electrodes are operated by a single control device by switching a changeover switch. However, in this resistance welding device, when a large number of welding electrodes and a control device are sequentially connected by switching a changeover switch, the contact portions are worn out, and high-speed switching is difficult. Furthermore, if the changeover switch is a semiconductor, there is no single device that can flow a large amount of current, and although it is possible to use multiple elements in parallel, it is difficult because of variations in the elements.

(Purpose 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) The resistance welding device of the present invention for solving the above problems includes:
A ring electrode is arranged concentrically at a constant interval on the outer circumferential side of a cylindrical center electrode, a ring-shaped distributor is arranged concentrically at a constant interval on the outer circumferential side of the ring electrode, and the center electrode is The ring electrode is supported and fixed at the center of the bottom plate of a cylindrical holder, the ring electrode is rotatably supported on the bottom plate of the holder, and the distributor is supported and fixed to the cylindrical holder via an insulating material, and is supported and fixed in the circumferential direction via a thin insulating layer. A connecting ring rotatably supporting a plurality of roll electrodes is arranged between the center electrode and the ring electrode and between the ring electrode and the distributor at equal angular intervals in the circumferential direction. The roll electrodes of both connecting rings are brought into contact with the outer circumferential surface of the center electrode and the inner circumferential surface of the ring electrode, and with the outer circumferential surface of the ring electrode and the inner circumferential surface of the distributor at equal angular positions in the same circumferential direction. An upper electrode for welding is connected to each of the divided blocks, and a lower electrode for welding is connected below the upper electrode for welding.
is provided, and this lower welding electrode and the center electrode are electrically connected to a welding control device.

(Example) An example of a resistance welding apparatus according to the present invention will be described with reference to the drawings. Figure 1 is a plan view, in which 1 is a center electrode made of a good conductor, 2 is a ring electrode made of a good conductor arranged concentrically at regular intervals on the outer periphery, and 3 is a ring electrode 2 on the outer periphery at regular intervals. It is a ring-shaped distributor that is arranged concentrically. The center electrode 1 is located in a recess 5a at the center of the bottom plate 5 of the cylindrical holder 4 shown in FIG.
It is supported and fixed to via an insulating material 6. The ring electrode 2 is rotatably supported on the bottom plate 5 of the holder 4 via an insulating material 6. The distributor 3 is
A cylindrical holder 4 is connected through an insulating material 8 and a bottom plate 5
It is supported and fixed on the top through an insulating material 6, and in the same direction is a thin 0
．． It is divided into a large number of blocks 3a via an insulating layer 9 of 0.01 to 0.1 mm, and these blocks 3a are made of a good conductor.

Between the center electrode 1 and the ring electrode 2 and between the ring electrode 2 and the distributor 3, a connecting ring 11 rotatably supports three roll electrodes 10 and 10' at equal angular intervals in the circumferential direction. .11" is arranged, and the roll electrodes 10.10" of both connecting rings 11.11" are arranged at the same circumferential equiangular position, and extend on the outer circumferential surface of the center electrode 1 and the inner circumferential surface of the ring electrode 2. The outer peripheral surface of the distributor 3 is brought into contact with the inner peripheral surface of the distributor 3, respectively. A large number of divided blocks 3a of the distributor 3
A welding upper electrode 12 is connected to each of the welding upper electrodes 12 , and a welding lower electrode 13 and the center electrode 1 are electrically connected to a welding control device 14 on the lower side of each welding upper electrode 12 . There is. The ring electrode 2 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 ring electrode 2 is rotated as shown by the arrow by a drive device (not shown), the roll electrodes 10 and 10' that are in contact with the inner and outer peripheral surfaces of the ring electrode 2 are driven to rotate as shown by the arrows, and the roll electrode 10 is rotated as shown by the arrow. Transferring on the outer circumferential surface of
It revolves in the same direction as the rotation direction of the ring electrode 2, and the roll electrode 10 degrees rotates on the inner peripheral surface of the distributor 3, and revolves in the same direction as the rotation direction of the ring electrode 2. mosquito(
As a result, each of the divided blocks 3a of the center electrode 1 and the distributor 3 becomes conductive one by one. At this time, the welding control device 14 controls the center electrode l, the roll electrode 10
, the ring electrode 2, the roll electrode 10', and the block 3a of the distributor 3, and are connected to the upper welding electrode 12.

Therefore, when a workpiece is inserted between the upper welding electrode 12 and the lower welding electrode 13 and members to be welded are inserted into the workpiece, the members to be welded are successively welded one after another. That is, the roll electrodes 10 and 10' are at the angle θ of the divided block 3a of the distributor 3,
If the energization time is tsec, the revolution speed is V</θ
/1 sec, the roll electrodes 10 and 10' rotate through the angle θ of the block 3a at a constant speed while maintaining conduction, and the insulating layer 9 between the divided blocks 3a becomes 0.0. 01~0. Since the IR is thin, the parts to be welded are continuously welded to the workpiece.

In the above embodiment, the roll electrodes 10 and 10'' are rotated by the rotation of the ring electrode 2, but the roll electrode 1
Direct rotational movement between 0 and 10 degrees may also be used.

In addition, a roll electrode 10, a ring electrode 2, a roll electrode 10
When the divided blocks 3a of the center electrode 1 and the distributor 3 are electrically connected through the L block 3a, the electrically connected L blocks 3a may be electrically connected to allow a large current to flow. This is suitable for members with a large contact area.

Furthermore, when it is sufficient to flow a small current in order to connect members with a small contact area, only one of the roll electrodes 10 and 10' is made a conductor, and the other one is made a non-conductor. It is preferable to disperse the current flowing through the split block 3a of the distributor 3 to other electrically connected split blocks 3a.

(Effects of the Invention) As can be seen from the above explanation, the resistance welding device of the present invention divides a ring-shaped distributor into a large number of blocks in the circumferential direction via a thin insulating layer, and connects the center electrode to the divided blocks in the circumferential direction. Since the welding current is conducted through the roll electrodes and ring electrodes provided at equal angular intervals in the direction, and the roll electrodes provided at equal angular intervals at the same circumferential position as the roll, one welding control device can be used. By passing a welding current through and rotating the roll electrode, the upper welding electrode connected to a number of divided blocks of the distributor and the lower electrode connected to the welding control device are energized with respect to the upper welding electrode. be done. Therefore,
The workpiece fed between the upper and lower electrodes and the member to be welded are connected, and continuous multi-point welding is achieved, which is an excellent effect.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of a resistance welding apparatus according to the present invention, and FIG. 2 is a sectional view taken along the line A--A in FIG. 1.

Claims (1)

[Claims] A ring electrode is arranged concentrically at a constant interval on the outer circumferential side of a cylindrical center electrode, a ring-shaped distributor is arranged concentrically at a constant interval on the outer circumferential side of the ring electrode, and the center electrode is The ring electrode is supported and fixed at the center of the bottom plate of a cylindrical holder, the ring electrode is rotatably supported on the bottom plate of the holder, and the distributor is supported and fixed to the cylindrical holder via an insulating material, and is supported and fixed in the circumferential direction via a thin insulating layer. A connecting ring rotatably supporting a plurality of roll electrodes is arranged between the center electrode and the ring electrode and between the ring electrode and the distributor at equal angular intervals in the circumferential direction. The roll electrodes of both connecting rings are brought into contact with the center electrode and the ring electrode, and the ring electrode and the distributor at equal angular positions in the same circumferential direction, and an upper electrode for welding is connected to each of the many divided blocks of the distributor. is,
A resistance welding device is provided with a lower welding electrode facing and below the upper welding electrode, and the lower welding electrode and the center electrode are electrically connected to a welding control device.