KR102324457B1 - Tool for refill friction stir spot weld - Google Patents

Abstract

The present invention relates to a refill friction stir spot welding tool. The refill friction stir spot welding tool includes: a plunger fixed to a welding gun body, having a first hollow hole therein, and having at least one first discharge hole formed with a predetermined length on the outer surface to be connected to the first hollow hole; a sleeve installed in the first hollow hole to be movable in a vertical direction as well as to be rotatable, having a second hollow hole formed therein, and having at least one second discharge hole formed with a predetermined length on the outer surface to be connected to the second hollow hole; a pin part installed in the second hollow hole to be movable in a vertical direction as well as to be rotatable; and a slider installed in the second discharge hole to be freely movable along the second discharge hole, wherein each of the first and second discharge hole is formed on a position corresponding to a side part of the pin part when the pin part ascends, and is formed to be inclined upward in a direction in which the sleeve and the pin part are rotated. According to the present invention, a rotation interference issue and a temperature rise issue of the pin part and the sleeve, which are caused by residues produced during a refill friction welding procedure, can be prevented, and residues located in the first discharge hole can be easily removed through the slider during the welding procedure without extra work, which can lead to an effect of facilitating maintenance/management.

Description

Refill friction stir spot welding tool {Tool for refill friction stir spot weld}

The present invention relates to a refill friction stir spot welding tool, and more particularly, it is possible to naturally cool the fin part and the sleeve through the first and second discharge holes, and the fin part and the sleeve due to residues generated during the refill friction welding process. It relates to a refill friction stir spot welding tool that can significantly improve welding quality by preventing the rotational operation interference problem and temperature rise problem in advance.

In the industry, as the demand for environmental protection and energy saving increases at home and abroad, technology development for weight reduction is being actively carried out. Among the lightweight alloys, aluminum alloys with excellent corrosion resistance, elongation, workability and good recyclability are attracting attention.

In the case of such an aluminum alloy, despite the above advantages, there is a problem in that it is difficult to join the aluminum alloy and the aluminum alloy. is using

The above-mentioned friction stir welding (Friction Stir Welding) technology uses the friction heat generated as the welding tips are in contact with the upper and lower portions of the pair of thin plate joint areas, respectively, and the contacted pair of welding tips rotate, As a solid-state joint welded by plastic flow, it does not generate blowholes or cracks and has less deformation due to welding compared to fusion welding such as arc welding, laser welding, and electron beam welding.

In addition, friction stir welding was initially limited to use in aluminum alloys, but in recent years, due to the development of technology, it has become possible to expand its use to welding of general steel materials as well as various lightweight materials.

Recently, even in the bonding of dissimilar materials that require bonding technology with various materials such as composites and ceramics, it is widely used in railway vehicles, aircraft, automobiles, etc.

In particular, in the automotive field, friction stir spot welding (hereinafter referred to as 'FSSW') for panel joining is also widely used.

Here, when the FSSW rotates at a high speed with the welding tip protruding downward for a certain length below the welding gun inserted to a certain depth into the base material, plastic flow is generated in the junction area of the plasticized base material due to friction between the welding tip and the base material, Solid-phase bonding is achieved by the stirring action between both base metals through plastic flow.

However, at the time when welding is completed, a groove having a shape corresponding to the shape of the welding tip is generated on one side of the base material into which the welding tip is inserted, thereby affecting the bonding force between the base materials as well as having an aesthetic problem.

Accordingly, recently, a refill friction stir spot welding device has been developed, which can improve the bonding force between the base metals by filling the corresponding groove in the welding process, and has excellent aesthetics, and an example thereof is shown in FIG. .

1A to 1D are views showing the operation of a conventional refill friction spot welding apparatus.

The conventional refill friction stir spot welding apparatus 100 includes a plunger 110 coupled to a welding gun body C, and a sleeve 120 that is rotatably installed inside the plunger 110 and is movably installed up and down. ) and the sleeve 120 is rotatably installed in the interior, and is composed of a pin portion 130 that is installed movably up and down.

In this conventional refill friction stir spot welding apparatus 100, the sleeve 120 and the pin part 130 descend and come into contact with the surface of the base material, rotate at high speed to plastically flow one side of the base materials to be joined (FIG. 1a), and then the pin part 130 rises and a part of the fluidized base material goes up and is stirred with each other. (Fig. 1b)

When the lifting of the pin 130 is completed, the sleeve 120 rises, and the pin 130 descends to a position corresponding to the surface of the base material to fill the groove into which the pin 130 is inserted (FIG. 1c), and then rises again and welds. Complete the task (Figure 1d).

That is, in the conventional refill friction stir spot welding apparatus 100, the pin part 130 lifts up a part of the fluidized base material and then descends to fill the groove while being disposed at a position corresponding to the surface of the base material, so that a groove is not generated after welding. There is no advantage.

However, in the conventional refill friction spot welding apparatus 100, unlike the general friction spot welding, a part of the base material that comes up in the process of the sleeve 120 or the pin part 130 moving up and down is the sleeve 120 and the pin part 130. There was a problem in that the residue generated by being drawn into between or between the sleeve 120 and the plunger 110 and remaining, and a part of the remaining base material being hardened later interferes with the rotational operation of the sleeve 120 and the pin unit 130 .

Furthermore, when the sleeve 120 and the pin 130 are rotated, the temperature of the sleeve 120 and the pin 130 rises larger than expected due to friction with the residue in contact with it, and thus the base material is heated to an unnecessarily high temperature. As the amount of flow of the base material becomes larger than expected due to heating, there is a problem in that the welding quality is greatly reduced.

Korean Patent Laid-Open No. 2016-0076702 'Refill Friction Stirring Spot Welding Equipment Integrated Specimen Fixing Jig'

The present invention has been devised to solve the above problems, and an object of the present invention is to naturally cool the fin part and the sleeve through the first and second discharge holes, and the residue generated in the refill friction welding process can be removed from the outside. It is to provide a refill friction stir spot welding tool that can significantly improve welding quality by preventing the rotational operation interference problem and temperature rise problem of the fin part and sleeve due to residues by discharging it to the furnace.

According to one aspect of the present invention for achieving the above object, it is fixed to the welding gun body, a first hollow is formed therein, and communicates with the first hollow on the outer surface of the at least one agent having a certain length. 1 The plunger in which the discharge hole is formed, is installed rotatably as well as vertically movable in the first hollow, a second hollow is formed therein, and communicates with the second hollow on the outer surface and has a predetermined length a sleeve having at least one second discharge hole formed therein, a pin portion rotatably installed while being movably installed in the vertical direction in the second hollow, and a free movement along the second discharge hole in the second discharge hole and a slider that is operably installed, wherein the first discharge hole and the second discharge hole are respectively formed at positions corresponding to the side portions of the pin portion when the pin portion is raised, and upward in a direction in which the sleeve and the pin portion rotate. It provides a refill friction stir spot welding tool, characterized in that formed inclined.

In addition, a plurality of the first discharge hole and the second discharge hole are respectively formed on the outer surface of the plunger and the sleeve, and both ends of the first discharge hole and the second discharge hole are on the same axis as the end of the adjacent discharge hole. It is preferable to be located in

In addition, the first discharge hole is formed in a shape corresponding to a movement path of any one virtual point on the surface of the pin portion when the pin portion rotates and rises, and the second discharge hole is formed on the sleeve surface when the sleeve rotates and rises. It may be formed in a shape corresponding to any one of the virtual point movement paths.

In addition, the slider is configured to include a pair of drop-off members installed in the second discharge hole to be freely movable along the second discharge hole, and the sleeve protrudes from one side of the inner surface where the second discharge hole is formed. , It is preferable to include a support protrusion for supporting the dropping member located on both sides of the second discharge hole, and for releasing the supporting state of the dropping member when the centrifugal force exceeds a predetermined threshold value.

The dropping member may be formed in a shape corresponding to the shape of both sides of the second discharge hole.

According to the present invention as described above, the problem of the rotational operation interference of the pin portion and the sleeve and the temperature rise caused by the residue generated in the refill friction welding process are prevented in advance, and the first discharge hole is passed through the slider in the welding process without a separate operation. It is possible to easily remove the residues located on the surface, so it is easy to maintain/manage, and there is an effect that the welding quality can be greatly improved by naturally cooling the fin part and the sleeve through the first and second discharge holes.

Furthermore, since the first discharge hole and the second discharge hole are formed in a shape corresponding to the discharge path of the residue, there is an effect that can greatly improve the discharge efficiency of the residue.

1 is a view showing the operation of a conventional refill friction spot welding apparatus;
2 is a perspective view of a refill friction stir spot welding tool according to an embodiment of the present invention;
3 is an exploded perspective view of a refill friction stir spot welding tool according to an embodiment of the present invention;
4 is a cross-sectional view of a refill friction stir spot welding tool according to an embodiment of the present invention;
5 is a view showing a state in which the pin portion and the sleeve rotate at high speed according to an embodiment of the present invention;
Figure 6 is a view showing a state in which the pin portion rises according to an embodiment of the present invention;
7 is a view showing a state in which the sleeve is raised and the pin part is lowered according to an embodiment of the present invention;
Fig. 8 is an enlarged view of 'A' shown in Fig. 7;

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is a perspective view of a refill friction stir spot welding tool according to an embodiment of the present invention, Figure 3 is an exploded perspective view of a refill friction stir spot welding tool according to an embodiment of the present invention, Figure 4 is an embodiment of the present invention A cross-sectional view of a refill friction stir spot welding tool according to an embodiment.

2 to 4, the refill friction stir spot welding tool 1 according to an embodiment of the present invention includes a plunger 10, a sleeve 20, a pin part 30 and a slider 40. consists of including

The plunger 10 is fixedly installed at an upper end of the ends of the welding gun body C opposite to each other, and is formed in a cylindrical shape in which the first hollow 11 is formed.

And, the plunger 10 is formed with a plurality of first discharge holes 12 communicating with the first hollow 11 along the outer periphery on one side of the outer surface, where the first discharge holes 12 are the inner surface and the sleeve 20 ) serves to provide a discharge path for the residue so that the residue remaining between them can be discharged to the outside by centrifugal force.

In addition, the first discharge hole 12 may be formed in a shape corresponding to any one virtual point movement path on the surface of the fin part 30 when the fin part 30, which will be described later, rotates and rises, which is the fin part 30. When it operates, it is formed in a shape corresponding to the movement path of the residue so that the residue can be easily discharged.

The sleeve 20 is approximately formed in a cylindrical shape with the second hollow 21 formed therein, is installed movably in the vertical direction in the first hollow 11 and is rotatably installed, and the first discharge hole 12 of the outer surface ) and a plurality of second discharge holes 22 communicating with the second hollow 21 at positions corresponding to the outer periphery are formed.

The sleeve 20 serves to plastically flow the joint area of the base material by rotating at high speed with the pin part 30 while the lower end digs into the bonding area of the base material and in contact with the base material, and the second discharge hole Reference numeral 22 serves to provide a discharge path of the residue so that the residue remaining between the inner surface of the sleeve 20 and the pin part 30 can move toward the sleeve 20 by centrifugal force.

In addition, the second discharge hole 22 may be formed in a shape corresponding to any one virtual point movement path on the surface of the sleeve 20 when the sleeve 20 to be described later rotates and rises, which is the sleeve 20 . When is operated, it is formed in a shape corresponding to the movement path of the residue so that the residue can be easily discharged.

On the other hand, in this embodiment, the sleeve 20 and the fin part 30 to be described later are naturally cooled through the first discharge hole 12 and the second discharge hole 22 to prevent thermal curing in advance in the welding process. The welding quality can be greatly improved.

The pin part 30 is formed in a substantially rod shape, and is installed movably in the vertical direction in the second hollow 21 and is rotatably installed so that the lower end part digs into the bonding area of the base material and rotates at high speed at the same time to rotate the sleeve 20 ) together with the plastic flow of the junction area of the base material.

The slider 40 is installed to be freely movable along the second discharge hole 22 on one side of the sleeve 20 in which the second discharge hole 22 is formed, and when the sleeve 20 rotates at high speed, the second discharge hole 22 is formed by centrifugal force. It moves along the discharge hole 22 , and in the process of moving along the second discharge hole 22 , the residue positioned in the second discharge hole 22 is removed from the sleeve 20 .

That is, the slider 40 according to the present embodiment automatically removes the residue remaining in the second discharge hole 22 in the welding process without a separate operation, so that the residue through the second discharge hole 22 is used for a long time. Make sure that the water discharging operation can be performed stably.

And, the slider 40 has a rail groove 40a formed along the outer periphery, and the rail groove 40a is coupled to the rail L formed on the inner surface of the sleeve 20 along the second discharge hole 22 and slides. can be moved

5 is a view showing a state in which the pin unit and the sleeve rotate at high speed according to an embodiment of the present invention, FIG. 6 is a view showing a state in which the pin unit is raised according to an embodiment of the present invention, and FIG. 7 is It is a view showing a state in which the sleeve rises and the pin part descends according to an embodiment of the present invention, and FIG. 8 is an enlarged view of 'A' shown in FIG.

The operation of the refill friction stir spot welding tool 1 according to an embodiment of the present invention having such a structure will be described with reference to the accompanying FIGS. 5 and 6 as follows.

First, the welding gun body (C) is moved so that the junction area of both base materials (T) to be joined is disposed between both ends of the welding gun body (C) facing each other.

Then, the sleeve 20 and the pin part 30 descend to contact the surface of the base material T disposed on the upper portion, and plastically flow one side of the base material T to be joined while rotating at a high speed.

Then, the slider 40 moves along the first discharge hole by centrifugal force generated by the high-speed rotation of the sleeve 20 to drop the residue remaining on one side of the sleeve 20 corresponding to the first discharge hole.

Thereafter, the fin part 30 rises so that a part of the fluidized base material T comes up, thereby agitating a part of both the fluidized base materials T with each other.

At this time, as the pin part 30 rotates at high speed and rises at the same time, a part of the base material T remaining between the pin part 30 and the sleeve 20, that is, the residue moves in the direction of the first discharge hole by centrifugal force. Another residue that is moved between the sleeve 20 and the plunger and that remains between the sleeve 20 and the plunger and the residue that has moved between the sleeve 20 and the plunger are discharged to the second discharge hole by centrifugal force.

After that, the sleeve 20 rises to a position corresponding to the surface of the base material T, and the pin part 30 also descends to a position corresponding to the surface of the base material T to fill the groove into which the pin part 30 is inserted. do.

In this process, since the sleeve 20 and the pin part 30 also continuously rotate at a high speed, as described above, the residue remaining in the pin part 30 and the sleeve 20 and between the sleeve 20 and the plunger The remaining residue is discharged to the outside through the first discharge hole or the second discharge hole.

When the welding operation is completed, the pin part 30 and the sleeve 20 rise and return to their initial positions, and in the return process, they rotate in reverse so that the slider 40 returns to the initial position along the first discharge hole by the centrifugal force. By doing so, the residue remaining in the first discharge hole is removed again by the slider 40 and the operation of discharging the residue through the first discharge hole can be stably performed even if used for a long time.

As described above, the refill friction stir spot welding tool 1 according to the present embodiment removes in advance the residue that interferes with the rotational operation and the lifting operation of the pin portion 30 and the sleeve 20, thereby removing the pin portion 30 and the sleeve. It has a feature that can significantly improve welding quality by preventing the temperature of (20) from rising unnecessarily.

9 is a view showing a slider according to another embodiment of the present invention, and FIG. 10 is a view showing a state in which any one dropping member hits the other dropping member according to another embodiment of the present invention.

The basic configuration of the embodiment of FIGS. 9 and 10 is the same as that of the embodiment of FIGS. 2 to 8 , but it is formed in a structure in which the operation of removing the residue from the second discharge hole 22 through the slider 40 can be made more easily. .

In the case of the previous embodiment, the sleeve in which the first discharge hole 12 and the second discharge hole 22 are formed while the residue is discharged through the first discharge hole 12 and the second discharge hole 22 after long use. Residues remain and accumulate on the inner surface of 20 and the inner surface of the plunger 10, and a part thereof may be blocked. The first discharge hole 12 is exposed to the outside for easy cleaning, but the second discharge hole ( 22) may be inconvenient to disassemble and clean as it is located inside the plunger 10 .

Accordingly, unlike the previous embodiment, the slider 40 is configured to include a pair of drop-off members 40-1 and 40-2 installed to be freely movable along the second discharge hole 22.

At this time, rail grooves 40a and 40b are respectively formed along the outer periphery of the drop-off members 40-1 and 40-2 according to this embodiment, and each rail groove 40a, 40b has a second discharge hole 22 . It is coupled to the rail (L) formed on the inner surface of the sleeve 20 along the sliding movement.

And, as shown in FIG. 9 , the sleeve 20 has a support protrusion 23 protruding from one side of the inner surface where the second discharge hole 22 is formed, and the support protrusion 23 is formed on both sides of the second discharge hole 22 Each is formed to protrude from one side corresponding to the part.

Accordingly, the support protrusion 23 is one side of any one of the drop-off members 40-1 and 40-2 located on both sides of the second discharge hole 22 among the pair of drop-off members 40-1 and 40-2. However, when the centrifugal force generated while the sleeve 20 rotates exceeds a predetermined threshold value, it serves to release the supporting state of the drop-off members 40-1 and 40-2. ) is described in more detail as follows.

By centrifugal force generated while the sleeve 20 rotates after the start of the welding operation or the welding operation, the drop-off members 40-1 and 40-2 move along the second discharge hole 22 to enter the second discharge hole 22. Remove the remaining residue by dropping off.

At this time, any one of the dropping members 40-1 not supported by the support protrusion 23 among the pair of dropping members 40-1 and 40-2 moves first, and then the centrifugal force reaches a predetermined threshold value. When it exceeds, the supporting state of the dropping member 40-2 is momentarily released by the supporting protrusion 23, and the falling member 40-2 supported by the supporting protrusion 23 moves at a very high speed.

In this way, in this embodiment, a pair of dropping members 40-1 and 40-2 moves with a time difference, and the speed of the second moving member 40-2 moves at a very high speed, first When the moving dislodging member 40-1 stops moving due to friction with the residue in the process of dropping the residue, the second moving decidual member 40-2 moves the first removing member 40 -1) by striking the first moving removal member (40-1) to move and at the same time to remove the remaining residue has a feature that can greatly improve the removal efficiency of the residue.

Since the other structures are the same as those of the above-described basic embodiment, the rest of the description will be omitted.

Although the present invention has been described with reference to the above-mentioned preferred embodiments, various modifications and variations are possible without departing from the spirit and scope of the invention. Accordingly, the appended claims are intended to cover such modifications and variations as fall within the scope of the present invention.

10: plunge 11: first hollow
12: first discharge hole 20: sleeve
21: second hollow 22: second discharge hole
23: support protrusion 30: pin part
40: slider 40a: rail groove
40-1, 40-2: dropout member 40-1a: rail groove
40-2a: rail groove

Claims (5)

a plunger fixed to the welding gun body, having a first hollow formed therein, and having at least one first discharge hole communicating with the first hollow on an outer surface and having a predetermined length;
At least one second discharge hole is installed movably in the vertical direction in the first hollow and is rotatably installed, a second hollow is formed therein, and communicates with the second hollow on the outer surface and has a predetermined length. a formed sleeve;
a pin portion rotatably installed while being movably installed in the vertical direction in the second hollow; and
a slider installed in the second discharge hole to be freely movable along the second discharge hole;
The first discharge hole and the second discharge hole are respectively formed at positions corresponding to the side of the pin portion when the pin portion is raised, and the sleeve and the pin portion are formed to be inclined upward in a rotational direction. Agitated spot welding tool.
According to claim 1,
A plurality of the first discharge hole and the second discharge hole are formed on the outer surface of the plunger and the sleeve, respectively,
Refill friction stir spot welding tool, characterized in that both ends of the first discharge hole and the second discharge hole are located on the same axis as the end of the adjacent discharge hole.
According to claim 1,
The first discharge hole is formed in a shape corresponding to any one virtual point movement path on the surface of the fin part when the fin part rotates and rises,
The refill friction stir spot welding tool, characterized in that the second discharge hole is formed in a shape corresponding to a movement path of any one virtual point on the surface of the sleeve when the sleeve is rotated and ascended.
According to claim 1,
The slider is configured to include a pair of dropping members installed in the second discharge hole to be freely movable along the second discharge hole,
The sleeve protrudes from one side of the inner surface in which the second discharge hole is formed, and supports the dropping member located on both sides of the second discharge hole, but when the centrifugal force exceeds a predetermined threshold value, the supporting state of the dropping member is released Refill friction stir spot welding tool, characterized in that it comprises a support projection.
5. The method of claim 4,
The refill friction stir spot welding tool, characterized in that the drop-off member is formed in a shape corresponding to the shape of both sides of the second discharge hole.

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