JP2774046B2 - Arc spot welding jig - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arc spot welding jig used for arc spot welding by an automatic handling apparatus.

[0002]

2. Description of the Related Art Arc spot welding of an overlapped work such as a steel sheet using an automatic handling device is a problem in welding.
An arc spot welding jig provided with a switch and a member to be welded held is attached to an automatic handling device, and the arc spot welding jig is positioned at the portion to be welded by operating the automatic handling device to cure the portion to be welded. And arc spot welding.

[0003] In this arc spot welding, usually, in order to increase the welding speed, a hole is previously formed in the upper work of the overlapped portion of the work, and a mother material in and around the hole is formed. It has been practiced to melt the material part.

FIG. 3 shows an arc spot welding jig (Japanese Utility Model Application Laid-Open No. 4-82023) proposed by the present inventors, in which a lower arm 12 'and an upper arm 11' are connected in one side. Assembling into a clamping mechanism of the type, opening and closing operation by a cylinder 3 ', a lower holding member 42 which is in contact with the back end of the work to be welded at the tip of the lower arm 12' on one side of the mechanism. The upper holding member 41 'is attached to the tip of the upper arm 11' so as to be in contact with the periphery of the welded portion on the work surface side, and the lower end of the welding torch 5 'is attached to the upper holding member 41. 'It is installed facing the inside.

In order to perform arc spot welding by attaching the arc spot welding jig to an automatic handling apparatus, the work is placed at a predetermined position, and then the spot to be welded on the work is welded. The jig's lower holding member 42 'is positioned just below the jig, and then the jig's cylinder rod 32' is protruded with respect to the cylinder body 31 'to lower the work to be spot-welded. The side holding member 42 'and the upper holding member 41' are clamped, and the welding torch 5 'is operated.
It is necessary to generate an arc.

[0006] The upper work of the spot welded portion includes:
Even if the base material of the upper and lower work parts around the hole and the base material of the lower work part in the hole are melted due to arc heat, the back surface of the spot welded part Since the lower holding member is in contact with the base material, the base material can be safely welded without falling off.

[0007]

However, in the above arc spot welding jig, if the work is misaligned with respect to the height direction, the work a 'as shown in FIG. The jig tilts, and it becomes difficult to completely adhere the lower holding member 42 'to the entire back surface of the spot-welded portion b' of the work. If a hole is previously formed in the upper work of the welded portion as described above, a deeper penetration of the lower work portion of the hole will result in a lower work. The contact portion with the lower holding member is melted, and the melted portion penetrates into the interface between the back surface of the work having low adhesion and the lower holding member due to the arc pressure, and after welding, the lower holding member is welded. It is difficult to remove the work from the work, and the workability is inevitably reduced.

Further, a reaction force acts on the arm of the automatic handling apparatus, and the motor is overloaded, so that a failure is likely to occur. Such a problem can be solved by adding a height direction alignment mechanism to the automatic handling device, but the alignment mechanism of the automatic handling device becomes complicated, and cost increases are inevitable.

SUMMARY OF THE INVENTION It is an object of the present invention to perform arc spot welding by attaching an arc spot welding jig to an automatic handling apparatus. An object of the present invention is to provide an arc spot welding jig having an axial alignment function on the jig side and capable of simplifying an alignment mechanism of an automatic handling device.

[0010]

An arc spot welding jig according to the present invention has an upper arm and a lower arm at one end thereof supported on a column so as to be slidable up and down. The cylinder rod is fixed to the other arm, and the lower arm is attached to the tip of the lower arm, and the lower holding member is attached to the back of the welded portion of the work. An upper holding member which is in contact with the periphery of the welded portion on the work surface side is attached to the tip of the arm, and the welding torch is attached with its lower end facing the upper holding member. is there.

[0011]

[Function] Used by attaching to an automatic handling device,
Positioning of the lower holding member and the upper holding member with respect to the sbot welded portion in the X-axis direction and the Y-axis direction is performed by an automatic handling device.

If the work is misaligned in the height direction (Z-axis direction), the lower arm and the upper arm are moved up and down in a direction to absorb the misalignment. Therefore, the positioning in the Z-axis direction is performed by the jig.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram showing an embodiment of the present invention.

In FIG. 1, reference numeral 11 denotes an upper arm, 12 denotes a lower arm, and 2 denotes a support. Both the upper arm 11 and the lower arm 12 are in a horizontal state. It is slidably supported in the direction. For example, a vertical rail is provided on the column 2, and a slider is attached to one end of each of the arms 11 and 12, and these sliders are slidably connected to the vertical rail. 21 is the upper end stopper of the support 2
Reference numeral 2 denotes a lower end stopper.

Reference numeral 3 denotes a cylinder vertically mounted between the arms 11 and 12, and the cylinder body 31 is connected to the upper arm 1
1 and the cylinder rod 32 is fixed to the lower arm 12. The cylinder body 31 can be fixed to the lower arm 12 and the cylinder rod 32 can be fixed to the upper arm 11 by turning the cylinder 3 upside down.

Reference numeral 42 denotes a lower holding member attached to the tip of the lower arm 12, which has a flat upper surface capable of abutting on the back surface of the work to be welded with a sufficient degree of contact. A cooling water passage is provided. The outline of the lower holding member 42 is slightly larger than the outline of the arc spot welded portion of the work, and is usually circular. In addition, as the material, metal such as copper,
Heat-resistant pottery and the like are used.

An upper holding member 41 is attached to the tip of the upper arm 11 so as to face the lower holding member 42 of the lower arm tip. The upper holding member 42 has a shape, for example, a cylindrical shape, which can be brought into contact with the periphery of the arc spot welded portion on the front surface side of the work with a sufficient degree of adhesion. As the material of the upper holding member 41, the same material as the lower holding member 42 can be used.

Reference numeral 5 denotes a welding torch attached to the tip of the upper arm 11. A support 51 is attached to the arm 11, and the welding torch 5 is supported by the support 51. The welding electrode at the lower end of the welding torch faces the upper part in the upper holding member 41.

Reference numeral 6 denotes a spring connected between the lower arm 12 and the lower end 22 of the support column. The upper arm 11 and the lower arm 1
2. Support the weight of the cylinder 3, etc.
The center position between the twelve 12 is aligned with the vertical center position of the column 2, and this state is the reference posture of the jig.

Reference numeral 7 denotes a moving arm attached to the column 2. Using the arc spot welding jig of the present invention,
To perform arc spot welding of a work (for example, welding of an industrial house beam, an automobile body, and other thin steel plates), the jig is attached to an automatic handling device at a moving arm 7 and the work is mounted. It is placed on a workbench and the upper and lower arms 11 and 12 are opened by the operation of the cylinder 3, and in this state, the lower arm 12 is moved by the X-axis and Y-axis positioning mechanisms of the automatic handling device. The lower holding member 42 and the upper holding member 41 (and the welding torch 5) of the upper arm 11 are aligned with the parts to be spotted on the work.

Next, the upper and lower arms are moved by the operation of the cylinder 3.
In the state where the arms 11 and 12 are closed and the center line between the upper and lower arms 11 and 12 is aligned with the center line of the work, the welded portion of the bot is welded to the lower holding member 42 and the upper holding member 41. Then, the welding torch 5 is operated to generate arc.

The upper work of the spot welded portion has
Even if the base material of the upper and lower work parts around the hole and the base material of the lower work part in the hole are melted due to arc heat, the back surface of the spot welded part Lower holding member 4
2 can be safely welded without the base material coming off.

In the jig of the present invention, the distance from the lower arm lower surface to the lower end stopper of the column (equal to the distance from the upper arm upper surface to the upper end stopper of the column) with respect to the above reference posture. ) Is h, even if the work has a positional deviation of ± h with respect to the height direction, this positional deviation is absorbed by the vertical movement of the vertical arm, and the vertical With the center line between the arms aligned with the center line of the work, the sbot welded portion is sandwiched between the lower holding member and the upper holding member, so that arc spot welding can be performed well. .

For example, as shown in FIG. 2A, the center position nn of the upper and lower arms 11, 12 in the reference state of the jig.
On the other hand, if the work a is shifted by + Δh in the Z-axis direction, the X-axis direction and the Y-axis
After the lower holding member 42 and the upper holding member 41 are aligned with the sbot welded portion by the axial movement adjustment, the upper holding member 41 is first brought into contact with the upper surface of the sbot welded portion by the operation of the cylinder 3. Then, as shown in FIG. 2B, the lower arm 12 is pulled by the cylinder rod 32 while resisting the tensile stress of the spring 6, and the lower holding member 42 is moved to the lower surface of the sbot welded portion. The lower holding member 42 and the lower surface of the sbot welded portion, and the upper holding member 41 and the upper surface of the sbot welded portion are brought into close contact with each other.

In this case, the tensile stress of the spring 6 acts in a direction to reduce the hydraulic traction force of the cylinder 3, but the weight of the entire jig can be reduced to about 3 to 4 kg by using an aluminum jig or the like. Since the spring constant of the spring 6 supporting the dead weight can be made sufficiently small, the cylinder 3 is attached to the close contact surface between the lower holding member 42 and the lower surface of the sbot welded portion and the close contact surface between the upper holding member 41 and the upper surface of the sbot welded portion. Can be applied almost as it is.

Therefore, the lower holding member 42 can be brought into contact with the back surface of the work to be welded to the bot with sufficient adhesion, and the lower work in the hole provided in the upper work of the weld to the bot can be provided. Even if the portion melts to a depth that reaches the lower holding member, it is possible to prevent the molten metal from entering the contact interface.

[0027]

The arc spot welding jig of the present invention has the above-described configuration, is used by being attached to an automatic handling device, and can be used even if the work is displaced in the Z-axis direction. Can be absorbed by the tool, and the jig can be substantially provided with a positioning function in the Z-axis direction. Therefore, the automatic handling device may be provided with positioning adjustment means in the X-axis direction and the Y-axis direction, The position adjusting mechanism of the automatic handling device can be simplified.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention.

FIG. 2 is an explanatory view showing a use state of the jig of the present invention. FIG. 2A shows a state before clamping of a sbot welded portion, and FIG. 2B shows a state after clamping.

FIG. 3 is an explanatory diagram showing a conventional example.

FIG. 4 is an explanatory diagram showing a use state of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Upper arm 12 Lower arm 2 Support 3 Cylinder 31 Cylinder main body 32 Cylinder rod 41 Upper holding member 42 Lower holding member 5 Welding torch

Claims (1)

(57) [Claims] An upper arm and a lower arm are slidably supported at one end on a column at one end, and a cylinder body of a cylinder is provided on one arm and a cylinder rod is provided on the other arm. Attach the lower holding member to the tip of the lower arm, which abuts against the back of the welded part of the work. An upper holding member which is in contact with the upper holding member, and wherein the welding torch is mounted with its lower end facing the upper holding member.
Spot welding jig.