JPH0999380A - Resistance welding equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To acquire a jig structure able to omit fine control of electrode height by keeping a upper end surface of lower electrode and a weldment in definite contact state with jig pressure means at the time of welding. SOLUTION: A resistance welding equipment is provided with upper and lower part electrodes 1, 2. Resistance welding is carried out by supplying material 8 to be welded with a feed means between the both electrodes 1, 2. Both electrodes 1, 2 are pressurized by upper and lower part cylinders 3, 4. The feed means A supports a movable jig 11 mounting the material 8 to be welded by a fixed jig 9 with a spring 12 and keeps an upper end part 20 of the lower part electrode 2 and the material 8 so as to be held in a constant contact state always. Namely, the material 8 on the movable jig 11 is inserted and is held between the upper and lower part electrodes 1, 2 by a base machine 10 and the welding is continuously carried out by pressure current flow. As a result, operation efficiency is raised and stabilization of the weld quality is attained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resistance welding apparatus capable of exchanging electrodes of a resistance welding machine without interruption of welding work, and more particularly to improvement of a holding jig used in the resistance welding apparatus.

[0002]

2. Description of the Related Art FIG. 4 is a front view showing the structure of a conventional resistance welding apparatus. In the figure, 101 is a resistance welding machine, 1 is an upper electrode, 2 is a lower electrode, 3 is an upper cylinder that pressurizes the upper electrode 1, and 4 is a lower cylinder that presses the lower electrode 2. Reference numeral 5 is a timer for controlling the energization time for setting the welding conditions of the resistance welding machine 101, 6 is a multi-transformer or welding transformer for controlling the welding current required for welding, and 7 is whether or not the processing according to the welding conditions has been performed. A weld checker 8 for monitoring the object is an object to be welded, for example, for welding a contact to a fixed contact of a circuit breaker. 9 is the object to be welded 8
Is a base machine for carrying the fixing jig 9 holding the workpiece 8 by a carrying device (not shown).

In such a conventional resistance welding apparatus, for example, the workpiece 8 conveyed by the base machine 10 is positioned at a predetermined welding position, and then the pair of upper electrode 1 and lower electrode 2 is used for coating. The welding work is performed by pressing the welded object 8 and applying a current under pressure under preset welding conditions. Here, the fixing jig 9 holding the object 8 to be welded has no degree of freedom because it is fixed to the base machine 10. For example, when the lower electrode 2 is worn or the object 8 to be welded having different specifications is used. When the electrode is replaced with another electrode for welding the upper end surface 20 of the lower electrode 2
Since the position of fluctuates and a constant electrode contact pressure cannot be obtained,
It was necessary to adjust the height of the electrode by putting it in and out, and setting it at a predetermined position.

[0004]

In the conventional resistance welding apparatus as described above, the fixing jig 9 holding the workpiece 8 is held.
However, there is a problem that the electrode height needs to be finely adjusted in order to stabilize the energization condition because the electrode is fixed. Further, since only one pair of the upper electrode 1 and the lower electrode 2 is provided, various kinds of parts are mixed and welded by changing the object 8 to be welded, for example, switching the model or rating of the circuit breaker. In such a case and when replacing the consumable electrode, there is a problem that the resistance welding machine 101 and the base machine 10 must be stopped and the upper electrode 1 or the lower electrode 2 must be replaced.

The present invention has been made in order to solve the above-mentioned problems, and a first object thereof is a jig structure capable of omitting fine adjustment of the electrode height generated at the time of electrode replacement or electrode wear. To obtain a resistance welding device having In addition, a second purpose is to replace electrodes when mixing and welding various types of parts and when replacing consumable electrodes, and to replace electrodes without stopping the resistance welding machine 101 and the base machine 10. It is to obtain a welding device.

[0006]

SUMMARY OF THE INVENTION A resistance welding apparatus according to the present invention comprises an upper electrode and a lower electrode for resistance welding, a movable jig for placing an object to be welded between these electrodes, and a spring from below, via a spring. A means for supplying an object to be welded, which is composed of a fixed jig that supports the movable jig, and a jig pressing means that presses the movable jig against the urging force of the spring. The jig pressing means always keeps the upper end surface of the lower electrode and the object to be welded in a constant contact state.

Further, in the above structure, the upper electrode and the lower electrode are configured as an intermediate electrode unit provided with a plurality of pairs of electrodes which are paired in the upper and lower portions. Further, the intermediate electrode unit is configured to be rotatable so as to place any one of the plurality of pairs of upper and lower electrodes at the welding position of the workpiece.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1. FIG. 1 is a front view showing the outline of the configuration of a resistance welding apparatus according to the present invention. In the figure, 101 is a resistance welding machine, 1 is an upper electrode, and 2 is a lower electrode.
Reference numeral 3 is an upper cylinder that pressurizes the upper electrode 1, and 4 is a lower cylinder that pressurizes the lower electrode 2. 5 is a resistance welding machine 10
1 is a timer for controlling the energization time for setting the welding conditions, 6 is a multi-transformer or welding transformer for controlling the welding current required for welding, and 7 is a weld for monitoring whether or not the processing according to the welding conditions has been performed. It is a checker. Reference numeral 8 is an object to be welded, for example, for welding a contact to a fixed contact of a circuit breaker. Reference numeral 9 denotes a fixing jig fixed to a movable portion of a base machine 10 which will be described later, and reference numeral 10 denotes a conveying means for conveying the fixing jig 9, that is, a base machine. 11 is a movable jig attached to the fixing jig 9 via a spring 12,
The object to be welded 8 is configured to be placed. 13a
Is an intermediate electrode unit holding a plurality of pairs of upper electrodes 1 and 13b is a lower electrode 2, and 14 is an angle indexing mechanism or index table capable of rotating and positioning the intermediate electrode units 13a and 13b by a predetermined angle. Yes, it is controlled and driven by a control device and a drive device (not shown).

FIG. 2 is a front view showing a detailed structure of the fixing jig 9 and the movable jig 11 part. In the figure, 15 is a pressing means, that is, a jig pressing cylinder, which is attached to the fixed part of the base machine 10 by the arm 16 on the welding position line of the workpiece 8 to be conveyed, and is synchronized with the lowering of the upper electrode 1. Then, the movable jig 11 is lowered and one end of the movable jig 11 is pressed from above while balancing the urging force of the spring 12. Reference numeral 20 denotes an upper end surface of the lower electrode 2.

FIG. 3 is a plan view showing details of the electrode portion. In the figure, 13a is an upper intermediate electrode unit, which is provided on the outer peripheral portion, for example, at a position where the plurality of upper electrodes 1a to 1h are equally divided. A lower intermediate electrode unit 13b is provided with lower electrodes 2a to 2h paired with the upper electrodes 1a to 1h on the outer peripheral portion. Reference numeral 14a denotes a rotary shaft of the index table 14, to which the upper intermediate electrode unit 13a and the lower intermediate electrode unit 13b are fixed and rotated by a driving device and a control device (not shown). 8a, 8b and 8h are placed on the movable jig 11,
It is an object to be welded that is conveyed in the direction of the arrow by the movable part of the base machine 10, and parts with different specifications may flow together or parts with the same specifications may flow.

Next, the operation of this resistance welding apparatus will be described.
In the resistance welding device having the above configuration, the base machine 10
The object to be welded 8 placed and conveyed on the movable jig 11 is supplied between the upper electrode 1 and the lower electrode 2 installed in the intermediate electrode unit 13 to be sandwiched and continuously pressurized and energized. Welding is performed. The welding conditions at this time are set in advance by the timer 5 and the welding transformer 6, and the welding can be automatically performed by checking the weld checker 7.

Here, the force with which the jig pressing cylinder 15 presses the movable jig 11 is F1, the urging force of the spring 12 supporting the movable jig 11 is F2, and the weight of the movable jig 11 is W. To do. After the workpiece 8 is conveyed by the movable part of the base machine 10 and positioned on a predetermined welding position line, the pair of upper electrode 1 and lower electrode 2 presses the workpiece 8 by the upper cylinder 3 and the lower cylinder 4. When the welding operation is performed, the jig pressing cylinder 15 descends in synchronism with the descending timing of the upper electrode 1 by energizing under pressure under preset welding conditions, and the urging force F2 of the spring 12 is applied. , The movable jig 11 is constantly pushed down by the jig pressurizing cylinder 15 so as to establish a relationship of W + F1> F2 while maintaining a balance with the jig weight W, and at the time of welding, the upper end surface 2 of the lower electrode 2
0 and the object to be welded 8 are always kept in a constant contact state to stabilize welding conditions. Therefore, even if the positional relationship between the workpiece 8 and the upper end surface 20 of the lower electrode 2 changes due to wear of the lower electrode 2 or a change in the mounting position when the electrode is replaced, fine adjustment of the electrode height and frequent changes Stable welding is possible without the need for electrode replacement.

Further, according to the above configuration, for example, when welding parts having different circuit breaker ratings, the electrodes corresponding to the parts supplied by the base machine 10 are connected to the upper intermediate electrode unit 13a and the lower intermediate electrode. By rotating the index shaft 14a, the electrode unit 13b can be selected from a plurality of electrodes, moved to a predetermined position on the workpiece 8, and welded. Further, in the case of welding the same parts, when the pair of upper electrode 1a and lower electrode 1b are consumed, for example, by rotating the upper intermediate electrode unit 13a and the lower intermediate electrode unit 13b, a new electrode can be easily formed. It can be switched. Furthermore, if there is a vacant electrode, the electrode can be exchanged by external setup during welding with another electrode. Therefore, the welding electrodes can be switched or exchanged without stopping the conveyance of the object to be welded or the operation of the welding machine, which improves the work efficiency and stabilizes the welding quality.

[Brief description of drawings]

FIG. 1 is a front view showing a schematic configuration of a resistance welding device according to an embodiment of the present invention.

FIG. 2 is a front view showing a welding jig of the resistance welding apparatus according to the present invention.

FIG. 3 is a plan view showing an intermediate electrode unit portion of the resistance welding apparatus according to the present invention.

FIG. 4 is a front view showing a configuration of a conventional resistance welding device.

[Explanation of symbols]

1 upper electrode, 2 lower electrode, 3 upper cylinder, 4
Lower cylinder, 5 timer, 6 multi-transformer (welding transformer), 7 weld chain force, 8 welded object, 9
Fixing jig, 10 base machine (transporting means), 11 movable jig, 12 springs, 13a, 13b intermediate electrode unit, 14 index table, 15 jig pressurizing cylinder (pressurizing means), 16 arms, 20 on lower electrode End face,
101 Resistance welding machine.

Claims (3)

[Claims] 1. An upper electrode and a lower electrode for resistance welding, a movable jig for placing an object to be welded between these electrodes, and a fixed jig for supporting the movable jig from below via a spring. And a jig pressing means for pressing the movable jig against the urging force of the spring,
A resistance welding apparatus, characterized in that, during welding, the upper end surface of the lower electrode and the object to be welded are always kept in a constant contact state by the jig pressing means. 2. The resistance welding apparatus according to claim 1, wherein the upper electrode and the lower electrode are configured as an intermediate electrode unit in which a plurality of pairs of electrodes that are paired at the upper portion and the lower portion are provided. 3. The resistance welding apparatus according to claim 2, wherein the intermediate electrode unit is configured to be rotatable so as to place any one of a plurality of pairs of upper and lower electrodes at a welding position of an object to be welded. .