JPH0733468U - Welding equipment - Google Patents

Abstract

(57) [Summary] [Structure] The clamp arm 34 of the clamp means 3 for the work to be mounted on the welding jig 1 is provided with the intermediate electrode 6 that comes into contact with the hitting point of the work. The pair of gun arms 52 and 53 of the welding gun mounted on the welding jig 1 presses the hitting point through the intermediate electrode 6. The striking portion can be pressed by a small stroke closing operation from the state where the welding gun is opened so as not to interfere with the work bending portion W1b existing in front of the striking portion. [Effect] The opening and closing stroke of the welding gun is small,
The welding gun can be miniaturized.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a welding device for welding a work on a welding jig.

[0002]

[Prior art]

 Conventionally, a welding device in which a clamping means for positioning and fixing a work and a welding gun for pressing a predetermined spot of the work are mounted on a welding jig, and spot welding of the spot is performed by the welding gun. Is known. Here, when welding a workpiece that has a wide bending part such as a flange that bends in a direction orthogonal to the normal direction of the jig body in front of the spotting part as seen from the jig body of the welding jig, conventionally The welding gun has an opening and closing stroke that is larger than the width of the bending part, so that the bending part of the work does not interfere with the welding gun when the work is attached to or detached from the welding jig in the normal direction.

[0003]

[Problems to be solved by the device]

 If the opening and closing slot talk of the welding gun is increased as in the above-mentioned conventional example, the welding gun becomes large and interference with other equipment mounted on the welding jig is likely to occur, which may make the design of the welding jig difficult. .

In view of the above points, an object of the present invention is to provide a welding apparatus capable of performing welding of a hitting point with a small welding gun even if there is a bent portion before the hitting point. ing.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention has a welding jig equipped with a clamping means for positioning and fixing a work and a welding gun for pressing a predetermined hitting point of the work. In a welding device for spot welding, an openable and closable clamp arm provided in the clamp means is provided with an intermediate electrode that abuts against the hitting point, and the welding gun presses the workpiece through the intermediate electrode. It is characterized by being configured.

[0006]

[Action]

 If the workpiece has a bend in front of the hitting point, the opening when the welding gun is opened needs to be wider than the width of the bend, but the welding gun closes the hitting point when it is closed. Since the welding gun is configured to hold down the pressure, the opening angle of the welding gun is wider by the length of the intermediate electrode compared to when the welding force is applied directly to the hitting point. Complete. When the work piece is attached to or detached from the welding jig, the clamp arm is opened, and the intermediate electrode is retracted out of the interference area with the work piece together with the arm member, so that the work piece can be attached and detached without being disturbed by the intermediate electrode. To be

[0007]

【Example】

 In the illustrated embodiment, the present invention is applied to a device for welding a reinforcing plate W2 to the back surface of the recessed stepped portion W1a at the rear edge of the rear door opening of the side panel W1 of an automobile.

With reference to FIGS. 1 to 3, reference numeral 1 denotes a welding jig in which a side panel W 1 can be set freely. A bracket 2 fixed to the jig 1 is provided with a rear edge portion of a rear door opening. 4. Clamping means 3 for positioning and fixing, holding means 4 for holding the reinforcing plate W2, and a pair of welding guns for spot welding the reinforcing plate W2 to the recessed stepped portion W1a at two spots. 5 and 5 are provided.

The clamp means 3 receives a work receiver 31 that receives an opening flange W1b at the rear edge of the rear door opening, and a clamp arm that opens and closes the work receiver 31 by a cylinder 32 with a pivot 33 as a fulcrum. 34, and is configured so that the opening flange W1b is sandwiched and fixed between the workpiece flange 31 and the work receiver 31 by the closing operation of the clamp arm 34.

The holding means 4 is a holder 45 with an electromagnet 44 for holding the reinforcing plate W2 on a swing frame 43 which is supported by the cylinder 41 on the bracket 2 so as to swing about a pivot 42 as a fulcrum. The reinforcing plate W2 is set on the holding tool 45 while the swing frame 43 is swung outward, and the side panel W1 is set on the welding jig 1 to fix the opening flange W1b. After being clamped and fixed by the clamp means 3, the swing frame 43 is swung inward so that the reinforcing plate W2 is abutted against the back surface of the recessed stepped portion W1a.

The two welding guns 5.5 are attached to support arms 43 a and 43 a extending to both side surfaces of the swing frame 43. As shown in FIG. 4, each welding gun 5 includes a fixed gun arm 52 that is fixed to a gun bracket 51 having a pair of side plates and that abuts the reinforcing plate W2, and a movable gun arm 53 that faces the fixed gun arm 52. The movable gun arm 53 is engaged with a cam groove 54 formed in the gun bracket 51 via a pair of engaging elements 53b, 53b on an arm holder 53a attached to the base end of the movable gun arm 53, and the movable gun arm 53 is hung on the gun bracket 51. A lever 56 interlocking with a pressurizing cylinder 55 provided is connected to an arm holder 53a so that the pressurizing cylinder 55 causes the movable gun arm 53 to be guided by the cam groove 54 with respect to the fixed gun arm 52 to be opened and closed. Further, the gun bracket 51 is swingably supported by the support arm 43a via a pivot 57 common to the lever 56 so that an equalizing function can be obtained. Reference numeral 58 in the figure denotes a power supply cable.

By the way, it may be considered that the movable gun arm 53 is brought into contact with the hitting point of the recessed stepped portion W1a with the reinforcing plate W2 and the hitting point is directly pressed by the movable gun arm 53 and the fixed gun arm 52. In this case, the movable gun arm 53 must be opened and closed with a stroke larger than the width of the flange W1b between the open position where it does not interfere with the opening flange W1b and the closed position where it abuts against the recessed step W1a. The welding gun 5 becomes large.

In view of this, in this embodiment, the clamp arm 34 of the clamp means 3 is provided with the intermediate electrode 6 that comes into contact with the hitting point, and the movable gun arm 53 of the welding gun 5 is brought into contact with the intermediate electrode 6 to move the movable gun arm 53. With the intermediate electrode 6 interposed between the fixed gun arm 52 and the fixed gun arm 52, the hitting portion is pressed to make it possible to shorten the opening / closing stroke of the movable gunm 53 by the length of the intermediate electrode 6.

The intermediate electrodes 6 are provided in a pair on the holder 61 attached to the clamp arm 34 so as to correspond to the two hitting points. The intermediate electrodes 6 are slidable on the holder 61 and the springs 62 are provided. The movable gun arm 53 is urged and supported in a direction away from the hitting point by the closing operation of the movable gun arm 53 so that the intermediate electrode 6 comes into contact with the hitting point, and the intermediate electrode 6 and the fixed gun arm 52 are hit by the hitting point. I was able to compress the department. Thus, when power is supplied to each welding gun 5 through the power supply cable 58, a welding current flows between the movable gun arm 53 and the fixed gun arm 52 through the intermediate electrode 6 and the spotting portion, and the spotting portion is spot welded. To be done.

The embodiment in which the reinforcing plate W2 is welded to the recessed stepped portion W1a of the rear door opening of the side panel W1 has been described above. However, when viewed from the jig main body side of the welding jig 1, the welding plate 1 is in front of the hitting portion. The present invention can be widely applied to welding of a work having a wide bent portion corresponding to the opening flange W1b of the above-described embodiment.

[0016]

[Effect of device]

 As is clear from the above description, according to the present invention, the welding point having a bent portion in the front can be spot-welded with a small welding gun having a small opening / closing stroke, so that other equipment to be mounted on a welding jig can be used. The interference of the welding gun with the welding gun can be avoided, and the design of the welding jig becomes easier.

[Brief description of drawings]

FIG. 1 is a front view of an example of the proposed device.

FIG. 2 is a view seen from the line II-II in FIG.

FIG. 3 is a view seen from the line III-III in FIG. 1.

FIG. 4 is a view seen from line IV-IV in FIG.

[Explanation of symbols]

 1 Welding jig 3 Clamping means 34 Clamp arm 5 Welding gun 6 Intermediate electrode

Claims (1)

[Scope of utility model registration request] 1. A welding jig is equipped with a clamp means for positioning and fixing a work and a welding gun for pressing a predetermined spot of the work, and spot welding of the spot is performed by the welding gun. In the welding device, an open / close clamp arm provided in the clamp means is provided with an intermediate electrode that abuts against the hitting point, and the welding gun is configured to press the work through the intermediate electrode. apparatus.