JPH07323378A - Welding device - Google Patents

Abstract

PURPOSE:To provide a welding device which facilitates management of welding electrodes and has high reliability as a welding device for welding tantalum wires and stainless steel sheet materials of a tantalum electrolytic capacitor. CONSTITUTION:A feeder line 11 and an anode electrode 6 are coupled to a rotating electrode shaft 5. A feeder line 22 and a cathode electrode 16 are connected to a rotating electrode shaft 15. The anode electrode 6 and the cathode electrode 16 are respectively successively rotated, by which the wear of the welding electrodes is eliminated and the stable welding is executed over a long period of time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding apparatus used for joining a tantalum wire of a tantalum electrode body and a thin stainless steel plate by resistance welding in the manufacturing process of a tantalum electrolytic capacitor.

[0002]

2. Description of the Related Art A conventional welding apparatus of this type will be described with reference to the drawings.

FIG. 5 shows a product to be welded by the above welding apparatus. A thin plate material 1 made of stainless steel and a tantalum wire 2a in a tantalum electrode body 2 are brought into contact with each other as shown in FIG. It shows the state to do.

FIG. 6 is a perspective view showing a main part of a conventional welding device. In the welding device shown in FIG. 6, a disk-shaped positive electrode is attached to a positive electrode holder 42 attached to the tip of a shaft 41 which moves up and down. An electrode 43 is attached, and a negative electrode 48 is fixed on a body 47. The positive electrode 43 is the support shaft 4
The rotation plate 4 is rotated about 4, and a rotation resistance is given by a friction plate 45 and a compression spring 46 between the positive electrode holder 42 and the positive electrode 43. The friction plate 45 also serves as a power supply plate for supplying power to the positive electrode 43.

Further, as shown in FIGS. 7 (a) and 7 (b), a fixed friction plate 49 is disposed on the orbit along which the positive electrode 43 moves up and down, and when the positive electrode 43 moves up and down, the fixed friction plate 49 is fixed. Friction plate 4
The positive electrode 43 was made to rotate little by little by bringing the positive electrode 43 into contact with 9, and the welding point of the positive electrode 43 was changed every time welding was performed.

[0006]

However, in the above conventional structure, the thin stainless steel plate 1 and the tantalum wire 2a are used.
When performing welding, the welding conditions are very difficult because there is a difference in the melting points of the respective materials (stainless steel approximately 1600 ° C., tantalum approximately 3000 ° C.), and the above-mentioned conventional welding equipment frequently changes welding conditions. There is a problem that the thin plate material 1 made of stainless steel is warped and the welding strength of the tantalum wire 2a is reduced on a daily basis.

As a cause thereof, as shown in FIG. 8, the rotation of the positive electrode 43 is uncertain and irregular because it depends only on the frictional force with the friction plate 45, so that it cannot be sent at a constant pitch. However, when it could hardly be fed, it was welded again at the worn portion, which caused welding failure.

Further, as shown in FIG. 9, since the negative electrode 48 is fixed, the wear of the welding point becomes severe and the negative electrode 48 must be frequently replaced.

Further, as shown in FIG. 10, since the positive electrode 43 is supplied with power only by the friction plate 45, the contact resistance varies due to the change of the friction surface and the welding state varies. It was a thing.

The present invention solves the above-mentioned problems of the prior art, does not cause welding defects at worn welding points, does not frequently replace the welding electrode, does not cause unstable power supply, and provides stable welding for a long time. It is an object of the present invention to provide an excellent welding device that can be performed.

[0011]

In order to solve the above-mentioned problems, a welding apparatus according to the present invention is provided with an anode-side electrode holder movably attached to a main body and a rotatably attached to the anode-side electrode holder. A disk-shaped positive electrode, a rotary motion imparting means for rotating the positive electrode, a cathode side electrode holder which is arranged under the anode side electrode holder and attached to the main body, and a rotation electrode for the cathode side electrode holder. A disk-shaped negative electrode movably attached, a rotary motion imparting means for rotating the negative electrode, a power supply line for supplying power to the positive electrode and the negative electrode, and the power supply line connected to the output side. The power supply and a control unit for controlling these are provided.

[0012]

With this configuration, the positive electrode can be automatically moved by an arbitrary amount according to the amount of wear of the electrode, and the welding point once worn is not used again, so that welding defects due to wear of the welding electrode occur. Can be prevented. Further, since the negative electrode can be similarly moved, the negative electrode is not frequently replaced. Furthermore, since the power supply electrodes are directly attached to both the positive electrode and the negative electrode, there is no fluctuation in the contact resistance during power supply, the amount of wear of the welding electrode can be accurately controlled, and stable welding can be performed for a long time.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.
Will be explained.

FIG. 1 is a perspective view showing the construction of the welding apparatus according to the present embodiment, and FIGS. 2 to 4 are front views of the essential parts showing the operation thereof.

In FIG. 1, reference numeral 3 denotes a shaft attached to the main body 12, which is moved up and down by another power not shown, and an electrode holder 4 on the anode side is fixed to the tip of the shaft 3. . This electrode holder 4
An electrode shaft 5 is rotatably attached to the disk, and a disk-shaped positive electrode 6, a friction plate 7 for giving friction to the positive electrode 6, and a compression spring 8 are attached to the tip of the electrode shaft 5. Further, at the rear end of the electrode shaft 5, a gear 9 and a power supply block 10 for rotating the electrode shaft 5,
The power supply line 11 is attached, and the power supply line 11 is the welding power source 2
Connected to 5.

Kickers 13a and 13b are attached to the main body 12 so as to rotate the positive electrode 6 by moving the gear 9 each time the electrode holder 4 moves up and down, while being connected to the air cylinders 14a and 14b. Kickers 13a, 13
b is configured to reciprocate up and down by driving the air cylinders 14a and 14b, and it is possible to select whether the positive electrode 6 is rotated or not.

Further, reference numeral 15 is an electrode shaft attached to the main body 12, and a disk-shaped negative electrode 16 is attached to the tip thereof, and a gear 17 and a negative electrode 16 for rotating the electrode shaft 15 in the middle thereof. A friction plate 18, a compression spring 19, and a spring holder 20 for giving friction to are attached. A power supply block 21 and a power supply line 22 are fixed to the rear end of the electrode shaft 15, and the power supply line 22 is connected to a welding power source 25. In addition, the kicker 2 is mounted on the main body 12 so as to rotate the negative electrode 16 by mounting the gear 17 thereon.
3a and 23b are connected and attached to the air cylinders 24a and 24b. The kickers 23a and 23b reciprocate back and forth by driving the air cylinders 24a and 24b to rotate the negative electrode 16.

When the stainless thin plate material 1 and the tantalum wire 2a are welded by the welding apparatus of the present invention thus constructed, the stainless thin plate material 1 and the tantalum wire 2a are placed on the negative electrode 16 as shown in FIG. Then, the positive electrode 6 is lowered, and a welding current is passed in a state where the positive electrode 6 is sandwiched between them to perform welding.

However, if the welding is repeated in this state, the welding point of the positive electrode 6 will gradually wear out, and eventually a welding defect will occur. ), (B),
After welding for that number of times, the air cylinder 14a is automatically driven, and when the positive electrode 6 rises, the kicker 13a turns the gear 9 to rotate the positive electrode 6, and the control unit 26 controls so as to shift the welding point. To do. The welding is repeated in this manner, and when the rotation of the positive electrode 6 reaches 180 °, the welding is stopped. At this time, since the power supply line 11 is also rotating with the rotation of the positive electrode 6, it is twisted by 180 °. Therefore, here, as shown in FIG. 3B, only the positive electrode 6 is manually rotated in the opposite direction by 180 ° so that welding can be performed at a portion not abraded.

Next, as shown in FIGS. 4A and 4B, this time the air cylinder 14b is driven to rotate the positive electrode 6 in the reverse direction by the kicker 13b, and welding is repeated to continue. Weld as many times as possible. At this time, the positive electrode 6 starts welding at a portion which is not worn, and the power supply line 11 also rotates together with the positive electrode 6, so that the thing twisted by 180 ° is restored. The welding is repeated, and when the entire circumference of the positive electrode 6 is used, the positive electrode 6 is replaced with a new one.

As for the negative electrode 16, the positive electrode 6 is also used.
Perform the work in the same way as above, and replace it when it is completely used on the front and back sides. In addition, the feeder lines 11 and 22
Is fixed to the electrode, and since it only repeats 180 ° reciprocal reversal, it does not hinder power supply.

In the above embodiment, the welding apparatus for welding the thin plate material 1 made of stainless steel and the tantalum wire 2a has been described as an example, but the present invention is not limited to this, and the same kind of metal or different kinds of metal can be used. It is needless to say that it can be applied to all resistance welding machines for joining the.

[0023]

The welding apparatus of the present invention constructed as described above has the following effects, and the industrial effects thereof are great.

1. Since the welding point of the positive electrode can be automatically and arbitrarily moved according to the amount of wear of the positive electrode, the amount of wear of the positive electrode can be accurately controlled, and welding defects due to wear of the positive electrode can be eliminated. You can

2. Similarly, with respect to the negative electrode, the welding point can be automatically moved arbitrarily, and the frequency of maintenance of the negative electrode can be reduced.

3. Since the positive electrode and the negative electrode can be directly fed with power, stable welding can be performed.

[Brief description of drawings]

FIG. 1 is a perspective view showing a welding apparatus according to an embodiment of the present invention.

FIG. 2 is a front view of an essential part showing the operation of the welding apparatus according to the embodiment.

FIG. 3 is a front view of an essential part showing the operation of the welding apparatus according to the embodiment.

FIG. 4 is a front view of a main part showing the operation of the welding apparatus according to the embodiment.

FIG. 5 is a perspective view showing a product to be welded by the welding apparatus according to the embodiment.

FIG. 6 is a perspective view of a main part showing a conventional welding device.

FIG. 7 is a front view of essential parts showing the operation of the conventional welding apparatus.

FIG. 8 is a front view of essential parts showing the operation of the conventional welding device.

FIG. 9 is a front view of a main part of a conventional welding device.

FIG. 10 is a side view of an essential part showing a conventional welding device.

[Explanation of symbols]

 1 Plate Material 2a Tantalum Wire 3 Shaft 4 Electrode Holder 5 Electrode Shaft 6 Positive Electrode 7 Friction Plate 8 Compression Spring 9 Gear 10 Feed Block 11 Feed Line 12 Main Body 13a, 13b Kicker 14a, 14b Air Cylinder 15 Electrode Shaft 16 Cathode 17 Gear 18 Friction plate 19 Compression spring 20 Spring holder 21 Power supply block 22 Power supply line 23a, 23b Kicker 24a, 24b Air cylinder 25 Welding power supply 26 Control unit

Claims (1)

[Claims] 1. An anode-side electrode holder that is vertically movably attached to a main body, a disk-shaped positive electrode that is rotatably attached to the anode-side electrode holder, and a rotary motion imparting rotation of the positive electrode. Means, a cathode-side electrode holder arranged below the anode-side electrode holder and attached to the main body, a disk-shaped negative electrode rotatably attached to the cathode-side electrode holder, and the negative electrode. A welding device comprising a rotating motion imparting means for rotating, a power supply line for supplying power to each of the positive electrode and the negative electrode, a power supply connecting the power supply line to an output side, and a control unit for controlling these.