JP2002096176A - Resistance welding apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a welding apparatus welding small electric parts without resulting in deviation in their position. SOLUTION: The resistance welding apparatus 1 has an auxiliary pressing means 5 that travels in the same direction as the welding electrodes 4a, 4b while the welding electrodes travel to the works, and make contact with and presses works before the welding electrodes come into contact with the works 2a, 2b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a resistance welding apparatus, and more particularly to a resistance welding apparatus suitable for welding small precision parts used as electronic parts and the like.

[0002]

2. Description of the Related Art In a resistance welding apparatus for welding small electronic components, a member to be welded is positioned at a predetermined position, a welding electrode is moved to a welding point, and the welding electrode is pressurized at a predetermined pressure. It is performed by applying a welding current in a state.

FIG. 3 is a view for explaining an example of a conventional resistance welding apparatus. FIG. 3 (A) shows a front view and FIG. 3 (B).
Shows a right side view. When the members to be welded 2a and 2b are transported to predetermined positions of the welding apparatus 1, the two welding electrodes 4a and 4b having different polarities attached to the pressing mechanism 3 are attached.
Is lowered, and a welding current is applied to the welding electrodes in a state where the members to be welded 2a and 2b are pressurized from above, and the parts to be welded 2a and 2b are welded. In these welding apparatuses, after the member to be welded is conveyed to a predetermined place by the conveying means, a welding current is applied while being pressed by the welding electrode.

However, if the position of the member to be welded is displaced before being pressed by the welding electrode, precise welding becomes impossible. In particular, in the case of small and precise electronic parts, the product after welding is used. There were problems such as being unable to do so. Further, in a small electronic component, a welding portion may be narrow or a space for introducing a welding rod into the welding portion may be limited. Therefore, a welding rod having a small diameter is used for the welding. However, if the material to be welded is sufficiently pressurized with a welding rod having a small diameter, the welding rod is likely to be deformed, and the life of the welding rod and the welding quality may be reduced.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a resistance welding apparatus for welding a small member such as an electronic component, which prevents displacement of the member at the time of welding, and prevents deformation of the welding electrode during pressurization. An object of the present invention is to prevent welding abnormalities and the like.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a resistance welding apparatus in which when a welding electrode is moved to a member to be welded, the welding electrode moves in the same direction as the moving direction of the welding electrode. The problem can be solved by a resistance welding apparatus having a pressurizing auxiliary means for pressing a member to be welded by contacting the member to be welded before contacting the member. The pressure assisting means is the above-described welding device that moves simultaneously with the welding electrode.
Further, the pressure assisting means is the above-described resistance welding apparatus having a pressure assisting pin that contacts the member to be welded and an urging means for urging the pressure assisting pin with a desired force. The pressure assisting means is the above-described resistance welding device which is electrically insulated from the welding electrode and held by the resistance welding device.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to a resistance welding apparatus, which moves a welding electrode to a member to be welded together with the welding electrode in the same direction as the welding electrode, and moves the member to be welded before the welding electrode. And a pressure assisting means for contacting with and holding the pressure. Thus, the member to be welded can be held under pressure prior to the contact of the welding electrode, so that the position of the member to be welded can be prevented from being shifted. In addition, since the member to be welded is held by the pressurizing auxiliary means, the welding electrode can use a welding electrode having a small diameter because the electrode pressure can be kept as small as possible and there is no need to apply a large pressure to the welding electrode. And the service life of the welding electrode can be extended. Further, when the resistance welding apparatus of the present invention is used for welding a conductive tab to a battery member, the welding position of the conductive tab can be accurately maintained, and a battery with small variations can be obtained.

The present invention will be described below with reference to the drawings.
FIG. 1 is a view for explaining an example of the resistance welding apparatus of the present invention. FIG. 1 (A) shows a front view, and FIG. 1 (B) shows a right side view. In the welding apparatus 1 of the present invention, when the members to be welded 2a and 2b are conveyed and the pressurizing mechanism 3 is lowered, before the two welding electrodes 4a and 4b having different polarities come into contact with the member to be welded 2a, the pressurizing mechanism is pressed. Pressurizing auxiliary means 5 attached to 3
The pressurizing auxiliary pin 6 has a contact with the member to be welded 2a, and the urging means (not shown) provided in the pressurizing auxiliary means and the pressing mechanism 3
The member to be welded 2a and the member to be welded 2b are fixed in close contact with each other by the pressing force formed by the above. Then
The welding electrodes 4a and 4b come into contact with the members to be welded, and a welding current is applied to perform welding between the members to be welded. The welding electrodes 4a and 4b may be independently adjustable in height so as to securely contact the members to be welded even if the members have different heights. Pressurizing auxiliary means 5
Is attached to the welding apparatus 1 by a support mechanism 7 formed of an insulating member, and it is preferable that the welding current is not affected by the contact of the pressurizing auxiliary means. In the apparatus shown in FIG. 1, an example in which the pressurizing auxiliary means is attached to the pressurizing mechanism that contacts the member to be welded as the pressurizing auxiliary means has been described. And may move independently. Also,
A plurality of pressure assisting means may be arranged according to the shape and size of the member to be welded.

FIG. 2 is a view for explaining an example of the pressurizing auxiliary means of the resistance welding apparatus according to the present invention. The pressure assisting means 5 has a spring 8 for urging the pressure assisting pin 6, and the member to be welded 2 a and 2 b are brought into close contact with the pressure assisting pin 6 urged by the spring. Fixed. After the member to be welded is tightly fixed, the welding electrode 4 comes into contact with the member to be welded 2a.

[0010] The urging of the pressure assist pin is not limited to a spring but may be a fluid,
Pressure may be applied by electromagnetic force or the like. It is preferable that the diameter of the welding electrode is appropriately selected according to the welding space, the shape of the member to be welded, the required welding strength, and the like. In addition, since the appropriate welding pressure is indicated by the sum of the pressure applied by the pressing auxiliary pin and the pressure applied by the welding electrode, the pressure of the auxiliary pressing pin becomes the appropriate welding pressure while keeping the welding electrode pressure as low as possible. It can be set as follows. It is preferable to provide a plurality of pressure assisting pins having different spring constants, and select and use a pin having a desired spring constant. For example, 1.2m in diameter
m, two welding electrodes, and 4 for each welding electrode.
Apply 9N (500g weight) force and 1.2m diameter
Similarly, by applying a force of 4.9 N (500 g weight) to the pressure assisting pin of m, even when a welding electrode having a small diameter is used, appropriate welding can be performed.

[0011]

According to the resistance welding apparatus of the present invention, before the contact of the welding electrode with the member to be welded, the pressure assisting means for pressing and fixing the member to be welded is provided. There is no displacement, and it is not necessary to apply a large pressure to the welding electrode to press the member to be welded, so that a welding electrode having a small diameter can be used.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an example of a resistance welding apparatus according to the present invention.

FIG. 2 is a view for explaining an example of a pressurization assisting means of the resistance welding apparatus according to the present invention.

FIG. 3 is a diagram illustrating an example of a conventional resistance welding apparatus.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Welding apparatus, 2a, 2b ... Member to be welded, 3 ... Pressurizing mechanism, 4, 4a, 4b ... Welding electrode, 5 ... Pressurizing auxiliary means, 6
... Pressure assist pin, 7 ... Support mechanism, 8 ... Spring

Claims (1)

[Claims] In a resistance welding apparatus, when a welding electrode is moved to a member to be welded, the welding electrode is moved in the same direction as the moving direction of the welding electrode, and the welding electrode is moved to the member to be welded before coming into contact with the member to be welded. A resistance welding device comprising a pressurizing auxiliary means for pressing a member to be welded in contact.