JP2577632Y2 - Indirect spot welding equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a first and second members to be welded on one side of a welded portion formed by overlapping each other.
A gun arm provided at an end thereof with an electrode tip capable of contacting the member to be welded, and a power supply pad capable of contacting the second member to be welded from the same side as the electrode tip at a position separated from the portion to be welded. It relates to an indirect spot welding device.

[0002]

2. Description of the Related Art Conventionally, such an indirect spot welding apparatus is known, for example, from Japanese Utility Model Application Laid-Open No. 63-90587. In this conventional apparatus, an electrode tip is provided on a gun arm and connected to a power supply pad. A cylinder having an axis perpendicular to the direction in which the electrode tip is pressed against the portion to be welded is attached to the gun arm, and after pressing the electrode tip against the portion to be welded, the cylinder is extended to operate the power supply pad. Is pressed against the member to be welded.

[0003]

However, in the prior art described above, the work is deformed due to the excessive pressurization of the power supply pad to the member to be welded due to the extension operation of the cylinder, and the work is deformed, so that the welding current flows. In such a case, poor welding such as perforation or burning may occur. Also, since the power supply pad moves forward and backward in the direction perpendicular to the direction in which the electrode tip is pressed against the welded portion, when the shape of the work changes, the position where the electrode tip is pressed against the welded portion, and the position of the electrode pad. May change, and a welding defect may occur due to a variation in welding current.

The present invention has been made in view of such circumstances, and avoids both excessive pressurization of the power supply pad and variations in the distance between the power supply pad and the electrode chip.
An object of the present invention is to provide an indirect spot welding apparatus that prevents welding defects.

[0005]

To achieve the above object, according to the first aspect of the present invention, the power supply pad is attached to the second member to be welded before the electrode tip is pressed against the portion to be welded. It is connected to the gun arm via an elastic connecting member so as to abut elastically.

According to the second aspect of the present invention, the power supply pad made of an elastic material elastically contacts the second member to be welded before the electrode tip is pressed against the portion to be welded. The gun arm is connected so as to be in contact with the gun arm.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

1 and 2 show a first embodiment of the present invention. FIG. 1 is a longitudinal sectional side view of an indirect spot welding apparatus, and FIG. 2 is an exploded perspective view of the indirect spot welding apparatus.

First, in FIG. 1, this indirect spot welding apparatus includes an outer panel 1 as a first member to be welded and an inner panel 2 as a second member to be welded, which are components of a vehicle door, for example. The welded portion 3 is formed by welding indirectly by welding the outer panel 1 to the hemmed peripheral edge of the outer panel 1 so that the peripheral edge of the inner panel 2 is sandwiched therebetween and superposed on each other. Will be.

The first member 1 to be welded on one side of the portion 3 to be welded
The electrode tips 6 provided on the gun arm 5 ₁ tip that is supported to operably support 4 fixed are possible contact, the other side of the welded portion 3, the insulating member 7 in an intermediate portion The supporting metal 8 is supported by an interposed metal plate 8, and the metal 8 is supported by the tip of a support arm 9 extending from the fixed support 4 and is attached to the inner panel 2 at a position separated from the welded portion 3. the power supply pad 10 ₁ from the same side and the electrode tip 6 is elastically contactable, power feed pad 10 ₁ is connected to the gun arm 5 _1.

Referring also to FIG. 2, the power supply pad 10 ₁
Is intended to be formed of a conductive metal having elasticity such as a leaf spring material, it is connected to one end of the connecting member 11 ₁ made of a conductive metal having elasticity such as a leaf spring material. An intermediate portion of the connecting member 11 _1, an insulating plate 12 between the gun arms 5 _1, the sleeve 13 made of an insulating material, and by a pair of bolts 15 and 15 by interposing a washer 14, 14 made of an insulating material It is fastened to the gun arm 5 _1. Thus power supply pad 10 ₁ and the connecting member 11 _1, will be connected to the gun arm 5 ₁ in an electrically insulated state. Moreover power supply pad 10 _1, with no external forces are those than the electrode tip 6 is connected to the connecting member 11 ₁ so as to be positioned downward, the electrode tip 6
When the electrode tip 6 comes into pressure contact with the welded portion 3, the electrode tip 6 comes into contact with the inner panel 2 before the electrode tip 6 comes into contact with the welded portion 3, and the power supply pad 1 is brought into contact with the electrode tip 6 being pressed against the welded portion 3.
0 ₁ while with flexing itself to deflect the connecting member 11 ₁ will inner panel 2 resiliently contact.

[0012] The Thus to gun arm 5 ₁ is connected conductors 16 connecting to the transformer, not shown, the other end of the connecting member 11 ₁ is connected to a conductor 17 leading to the transformer.

[0013] Next, to explain the action of this first embodiment, when the electrode tip 6 is pressed against the welded portion 3 in response to actuation of the gun arms 5 _1, power supply pad 10 in response to actuation of the gun arm 5 _{1 1} resiliently comes into contact with the inner panel 2, and the electrode chip 6 and the power supply pad 10
₁ is operated with the gun arm 5 _1. Since the power supply pad 10 ₁ resiliently contacts the inner panel 2, no excessive pressurization of the inner panel 2 occurs. There is no poor welding.

The inner panel 2 of the power supply pad 10 ₁
And contact position to the distance between the pressing position to the welded portion 3 of the electrode tip 6 also becomes substantially constant regardless of the shape change of the workpiece, the wear operation amount change of gun arm 5 ₁ by the electrode tips 6 It can also be addressed with deflection of the deflection of the power supply pads 10 ₁ itself and the connecting member 11 _1, welding defects are not generated due to a variation in the welding current.

[0015] Figure 3 shows a second embodiment of the present invention, _second feed pad 10 formed of a conductive metal having elasticity such as a leaf spring material, the insulating plate 18, made of an insulating material sleeve 19 , as well as the bolt 21 through a washer 20 made of an insulating material are fastened to one end of the connecting member 11 _2, the other end of the connecting member 11 ₂ having elasticity such as a leaf spring member on the side of the gun arm 5 ₂ It is fastened.

[0016] The Thus to gun arm 5 ₁ is connected conductors 16 leading to the transformer (not shown), the power supply pad 10 ₂ conductors 17 connected to the transformer is directly connected.

Also in the second embodiment, the gun arm 5
When the electrode tip 6 in response to actuation of ₂ is pressed against the welded portion 3, power supply pad 10 in response to actuation of the gun arm 5 _2
2 will elastically contact the inner panel 2,
Electrode tip 6 and the feeding pads 10 ₂ gun arm 5 ₂
Works with power supply pads 10 ₂ inner panel 2
, The inner panel 2 does not overpressurize. Also the contact position of the inner panel 2 of the power supply pads 10 _2, the welded portion 3 of the electrode tip 6
The distance between the pressing position to also becomes substantially constant regardless of the shape change of the workpiece, the power supply pad 10 ₂ itself to the operating amount change of gun arm 5 ₂ due to wear of the electrode tip 6 flexure and the connecting member 11 _second It is possible to cope with the bending, and it is possible to prevent the occurrence of poor welding as in the first embodiment.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments, and various designs can be made without departing from the present invention described in the claims for utility model registration. Changes can be made.

For example, in the above embodiment, the power supply pad 10
Each of the power supply pads 10 ₁ and 10 ₂ and the connecting members 11 ₁ and 11 ₂ is made of an elastic material.
_1, 10 ₂ and the connecting member 11 _1, 11 ₂ of one only may be formed of an elastic material.

[0020]

As described above, according to the first aspect of the present invention, the power supply pad is configured to resiliently contact the second welded member before the electrode tip is pressed against the welded portion. Since the power supply pad is elastically connected to the member to be welded by being connected to the gun arm through an elastic connecting material, the power supply pad is elastically brought into contact with the member to be welded, thereby over-pressing the power supply pad to the member to be welded. And the distance between the electrode pad and the electrode pad and the electrode pad is kept almost constant, despite the change in the shape of the workpiece.
The occurrence of poor welding can be prevented.

According to the second aspect of the present invention, the power supply pad made of an elastic material is elastically applied to the second member to be welded before the electrode tip is pressed against the portion to be welded. As it is connected to the gun arm so that it touches, the power supply pad itself deflects itself and can resiliently contact the member to be welded, thereby preventing the power supply pad from over-pressing the member to be welded. In addition, the distance between the pressure contact position of the electrode tip to the welded portion and the electrode pad can be kept substantially constant irrespective of the change in the shape of the workpiece, and the occurrence of poor welding can be prevented.

[Brief description of the drawings]

FIG. 1 is a longitudinal side view of an indirect spot welding apparatus according to a first embodiment.

FIG. 2 is an exploded perspective view of the indirect spot welding apparatus.

FIG. 3 is an exploded perspective view corresponding to FIG. 2 of the second embodiment.

[Explanation of symbols]

1 ... inner panel 3 ... welded portion 5 ₁ of the outer panel 2 ... second weld members as the first member being welded, 5 ₂ ... gun arm 6 ... electrode tip 10 ₁ , 10 ₂ ... power supply pad 11 ₁ , 11 ₂ ... connecting member

Claims (2)

(57) [Scope of request for utility model registration] A first and second member to be welded (1, 2).
Are welded to one another on one side of the welded portion (3).
A gun arm (5 ₁ , 5 ₂ ) provided at its tip with an electrode tip (6) capable of contacting the member to be welded (1); and an electrode tip (6) at a position separated from the welded portion (3). in the same side indirect spot welding apparatus and a second abutment that can be powered pad member to be welded (2) (10 _1, 10 _2), the feed pad (10 _1, 10 _2),
Prior to pressing the electrode tip (6) against the portion (3) to be welded, the elastic connecting members (11 ₁ , 11 ₂ ) are elastically brought into contact with the second member (2). An indirect spot welding apparatus characterized by being connected to a gun arm (5 ₁ , 5 ₂ ) via a wire. 2. The first and second members to be welded (1, 2).
Are welded to one another on one side of the welded portion (3).
A gun arm (5 ₁ , 5 ₂ ) provided at its tip with an electrode tip (6) capable of contacting the member to be welded (1); and an electrode tip (6) at a position separated from the welded portion (3). in the same side indirect spot welding apparatus and a second abutment that can be powered pad member to be welded (2) (10 _1, 10 _2), the feed pad formed of an elastic material (10 _1, 10 ₂ ) is a second member to be welded (2) prior to pressing the electrode tip (6) against the portion to be welded (3).
Gun arms (5 ₁ , 5 ₂ )
Indirect spot welding device, characterized in that it is connected to