KR102166007B1 - Probe length adjustable friction stir welding tool - Google Patents

Abstract

The present invention relates to a friction stir welding tool capable of adjusting a length of a probe. The friction stir welding tool comprises: a shank provided with a probe connection unit, to which a probe is detachably installed, at a lower end of a support holder insertion unit; a shoulder inserted and installed around the lower circumference of the probe; the probe detachably installed at the bottom of the shank; a support holder which is installed below the shank, and has a shank insertion unit provided at an inner upper part and a fixing plate receiving unit provided at an inner lower part; a first fixing plate installed at a lower end of the fixing plate receiving unit of the support holder and fixing the shoulder; a second fixing plate installed at an upper part of the first fixing plate on the fixing plate receiving unit of the support holder and fixing the shoulder; a third fixing plate installed at an upper part of the second fixing plate on the fixing plate receiving unit of the support holder; an adjustment bolt screwed to the third fixing plate to adjust a protruding length of the probe; and a fixing bolt for fixing the first fixing plate, the second fixing plate, and the third fixing plate to the support holder. Accordingly, when the protruding length of the probe is shortened due to wear of a tip end of the probe during a friction stir welding process, the protruding length of the probe may be appropriately adjusted through a length adjusting means. Therefore, economical use of the probe can be achieved, and joint quality of friction stir welding can be maintained uniformly.

Description

Friction stir welding tool with adjustable probe length {PROBE LENGTH ADJUSTABLE FRICTION STIR WELDING TOOL}

The present invention relates to a friction stir welding tool capable of adjusting the length of the probe, and more particularly, when the probe is worn during the friction stir welding process and the protruding length of the probe is shortened, the protruding length of the probe can be adjusted. It relates to making it possible to extend the value and to maintain a uniform welding quality.

In general, friction stir welding (FSW) has been conducted since the mid-1990s because it is advantageous for bonding different materials of low melting point/lightweight alloys such as aluminum, copper, and magnesium alloys.

Since the 2000s, various studies on the bonding of aluminum + plated steel have been carried out, mainly in the automotive field, and some have already been commercialized and applied to the production site.

In addition, the target material is also expanding to high melting point/special alloy/high strength materials such as steel and stainless steel, titanium alloy, and nickel alloy.

In particular, as for the applied technique, related research is being carried out to expand the application to finer structure, heat treatment, defect removal and repair of castings based on welding/joining, and the applied technique to these fields is'friction stirring treatment ( Friction Stir Process: FSP).

The core of FSW and FSP related technologies is a friction heat generating mechanism/device called a “tool,” and in common, it is composed of materials with superior high melting point/high temperature strength/high temperature wear performance than the target material.

When pressure is applied to the target material while rotating the tool, the contact part of the target material is heated to reach the plastic flow temperature, and plastic flow of particles occurs in a solid state, enabling metal bonding/joining.

The plastic flow temperature is generally known to be about 450 to 550°C in the case of an aluminum alloy, and varies depending on the type of material.

The tool that is frequently used for aluminum FSW/FSP is heat-resistant tool steel (SKD61), and in order to target a higher melting point material, it is necessary to make a tool (shoulder and probe) with a material with excellent high melting point/high temperature strength/high temperature wear performance. .

In Patent Document 1 below, an inverted conical shoulder part connected to the friction pin is integrally formed on the bottom surface of the body part of the probe rotating body having a friction pin at the tip, but the inverted conical shoulder part has an inclined surface with a gentle slope than the inclination of the friction pin. It has a helical groove formed on the inclined surface, so that a homogeneous welding effect can be obtained without tilting the probe at a certain angle, thereby reducing the equipment cost, stable welding effect even in a narrow turning radius, and having an uneven surface. A friction-moving welding probe capable of exhibiting homogeneous welding characteristics without burrs or welding defects even when applied to a member is disclosed.

The following Patent Document 2 includes a columnar body portion, a shoulder portion formed under the body portion, a probe portion protruding in the center of the shoulder portion, and an inner tube forming portion formed through the probe portion. A stir welding tool is disclosed.

Republic of Korea Patent Publication No. 10-2011-0088266 (published on August 03, 2011) Republic of Korea Patent Publication No. 10-2013-0098029 (published on September 04, 2013)

The friction stir welding tool inevitably causes abrasion of the shoulder and probe as the joining operation proceeds.

Homogenization of the bond quality (bond depth) depends on the probe length (strictly the relative distance from the probe tip to the shoulder edge).

Accordingly, even in the case of an integrated tool (Shoulder+Probe), it is possible to secure the probe length by periodically reprocessing, but it is very inefficient.

Most of the friction stir welding tools (FSW tools) according to the prior art are configured in a form in which the shoulder and probe are detachable/replaceable, but the probe length (H) according to wear during use is often finely adjusted. Or it cannot be modified.

In particular, in the case of bonding different materials such as plated steel plate + aluminum alloy plate bonding, it is sometimes economical to fabricate the shoulder and probe with different materials (generally, the probe material is used with relatively excellent high-temperature strength/high-temperature wear characteristics. Yes.) In this case, the probe length adjustment function can be very useful.

The present invention is to solve the problem of the friction stir welding tool according to the prior art, and its purpose is to enable the economical use of the probe by allowing the probe length to be adjusted, and to maintain the joint quality uniformly. It is to provide a friction stir welding tool capable of adjusting the length of the probe.

In order to achieve the object as described above, the friction stir welding tool capable of adjusting the length of the probe according to the present invention includes a shank provided with a probe connection portion in which the probe is detachably installed at the lower end of the support holder insertion portion; A shoulder inserted and installed around the lower circumference of the probe; A probe detachably installed at the bottom of the shank; A support holder installed at the lower portion of the shank, the shank insertion portion is provided at the upper portion of the shank, and the fixing plate receiving portion is provided at the lower inner portion; A first fixing plate installed at the lower end of the fixing plate receiving part of the support holder and fixing the shoulder; A second fixing plate installed on the upper part of the first fixing plate of the fixing plate receiving part of the support holder and fixing the shoulder; A third fixing plate installed on the second fixing plate of the fixing plate receiving part of the support holder; An adjustment bolt screwed to the third fixing plate to adjust the protruding length of the probe; And a fixing bolt for fixing the first fixing plate, the second fixing plate, and the third fixing plate to the support holder.

In the friction stir welding tool capable of adjusting the length of the probe according to the present invention, a plurality of cooling air circulation holes are provided in the vertical direction in the support holder insertion portion of the shank, and the shank insertion portion is connected to the outer one side and the other outer side of the support holder. It characterized in that the cooling air inlet hole is provided.

In the friction stir welding tool capable of adjusting the length of the probe according to the present invention, fitting grooves are provided on both sides of the outer circumference of the upper end of the shoulder, and the first fixing plate is cut in half and can be separated left and right, and in the center of the first fixing plate. It is characterized in that a fitting hole is provided to be inserted into the fitting groove of the shoulder, and a shoulder insertion groove is provided in the center of the lower end of the second fixing plate.

The friction stir welding tool capable of adjusting the length of the probe according to the present invention includes: a shank provided with a probe connection portion to which a probe is detachably installed at a lower end of the support holder insertion portion; A shoulder inserted and installed around the lower circumference of the probe; A probe detachably installed at the bottom of the shank; A support holder installed at the lower portion of the shank, the shank insertion portion is provided at the upper portion of the shank, and the fixing plate receiving portion is provided at the lower portion of the inner portion; A first fixing plate installed at the lower end of the fixing plate receiving part of the support holder and fixing the shoulder; A second fixing plate installed on the upper part of the first fixing plate of the fixing plate receiving part of the support holder and fixing the shoulder; A third fixing plate installed on the second fixing plate of the fixing plate receiving part of the support holder; An adjustment disc installed on the upper end of the third fixing plate or the upper end of the second fixing plate to adjust the protruding length of the probe; It characterized in that it comprises a; fixing bolts for fixing the first fixing plate, the second fixing plate, and the third fixing plate to the support holder, wherein the outer diameter of the adjustment disk is formed larger than the probe through hole formed in the center of the third fixing plate. 3 It is characterized in that it is formed smaller than the probe passage hole formed in contact with the upper end of the fixing plate or formed in the center of the third fixing plate and contacts the upper end of the second fixing plate.

According to the friction stir welding tool capable of adjusting the length of the probe according to the present invention, if the protruding length of the probe is shortened due to wear of the tip of the probe during the friction stir welding process, the protruding length of the probe can be appropriately adjusted through the length adjusting means. As a result, it is possible to achieve economical use of the probe, and to maintain a uniform joint quality of friction stir welding.

1 is a longitudinal sectional view of a friction stir welding tool capable of adjusting the length of a probe according to a first embodiment of the present invention;
2A and 2B are front and bottom views of a shank of a friction stir welding tool capable of adjusting the length of a probe according to the first embodiment;
3A and 3B are longitudinal cross-sectional views and plan views of a shoulder of a friction stir welding tool capable of adjusting the length of a probe according to the first embodiment;
4A and 4B are front and bottom views of the probe of the friction stir welding tool capable of adjusting the length of the probe according to the first embodiment;
5A and 5B are a longitudinal cross-sectional view and a plan view of a support holder of a friction stir welding tool capable of adjusting the length of a probe according to the first embodiment;
6A and 6B are plan and front views of a first fixing plate of a friction stir welding tool capable of adjusting the length of a probe according to the first embodiment;
7A and 7B are a bottom view and a longitudinal sectional view of a second fixing plate of a friction stir welding tool capable of adjusting the length of a probe according to the first embodiment;
8A and 8B are plan and longitudinal sectional views of a third fixing plate of a friction stir welding tool capable of adjusting the length of a probe according to the first embodiment;
9A and 9B are plan and longitudinal sectional views of the adjustment bolt of the friction stir welding tool capable of adjusting the length of the probe according to the first embodiment;
10 is a diagram illustrating a process of adjusting the protruding length of the probe of the friction stir welding tool capable of adjusting the length of the probe according to the first embodiment;
11A and 11B are longitudinal cross-sectional views of a friction stir welding tool capable of adjusting the length of a probe according to a second embodiment of the present invention;
12A and 12B are plan and longitudinal sectional views of a third fixing plate of a friction stir welding tool capable of adjusting the length of a probe according to the second embodiment;
13A and 13B are front and front views of an adjustment disk of a friction stir welding tool capable of adjusting the length of a probe according to the second embodiment;
14 is a diagram illustrating a process of adjusting the protruding length of the probe of the friction stir welding tool capable of adjusting the length of the probe according to the second embodiment.

Hereinafter, a friction stir welding tool capable of adjusting the length of a probe according to the present invention will be described in detail with reference to the accompanying drawings.

Hereinafter, “upward”, “downward”, “front” and “rear” and other directional terms are defined based on the state shown in the drawings.

1 is a longitudinal sectional view of a friction stir welding tool capable of adjusting the length of a probe according to a first embodiment of the present invention.

The friction stir welding tool 100 capable of adjusting the length of the probe according to the first embodiment of the present invention includes a shank 110, a shoulder 120, a probe 130, a support holder 140, and a first fixing plate 150. , A second fixing plate 160, a third fixing plate 170, an adjustment bolt 180, and a fixing bolt 190.

2A and 2B are front and bottom views of a shank of a friction stir welding tool capable of adjusting the length of a probe according to the first embodiment.

The shank 110 is a portion connected to the rotating shaft, and a probe connection part 112 is provided at the lower end of the support holder insertion part 111 to which the probe 130 is detachably installed.

The support holder insertion portion 111 of the shank 110 is provided with a plurality of cooling air circulation holes 113 in the vertical direction.

The shoulder 120 is a part that protects the probe 130 and is inserted and installed around the lower circumference of the probe 130.

3A and 3B are longitudinal sectional views and plan views of a shoulder of a friction stir welding tool capable of adjusting the length of a probe according to the first embodiment.

The shoulder 120 is a cylindrical shape through which the probe 130 passes in the vertical direction, and fitting grooves 121 are provided on both sides of the outer circumference of the upper end.

4A and 4B are front and bottom views of a probe of a friction stir welding tool capable of adjusting the length of the probe according to the first embodiment.

The probe 130 is a portion that contacts the welding surface and is detachably installed at the lower end of the shank 110.

A shank connection head 131 coupled to the probe connection part 112 of the shank 110 is provided on the upper end of the probe 130.

The support holder 140 is a portion that supports the shoulder 120 and is installed under the shank 110.

5A and 5B are longitudinal sectional views and plan views of a support holder of a friction stir welding tool capable of adjusting the length of a probe according to the first embodiment.

The support holder 140 is a cylindrical shape with a lower end sealed, a shank insertion portion 141 is provided at an upper portion thereof, and a fixed plate receiving portion 142 of a regular octagonal planar shape is provided at the lower inner portion.

A shoulder withdrawal hole 143 is provided in the lower center of the support holder 140, and a cooling air inlet hole 144 connected to the shank insertion part 141 is provided at a predetermined inclination angle on the outer one side and the other outer side of the support holder 140. Road is formed.

The first fixing plate 150 is a portion that fixes the shoulder 120 and is installed at the lower end of the fixing plate receiving portion 142 of the support holder 140.

6A and 6B are plan and front views of a first fixing plate of a friction stir welding tool capable of adjusting the length of a probe according to the first embodiment.

The first fixing plate 150 has a regular octagonal planar shape, and has a shape that can be cut in half and separated from side to side.

A fitting hole 151 is provided in the center of the first fixing plate 150 to be inserted into the fitting groove 121 of the shoulder 120.

The second fixing plate 160 is a portion that fixes the shoulder 120 and is installed on the first fixing plate 150 of the fixing plate receiving portion 142 of the support holder 140.

7A and 7B are bottom and longitudinal sectional views of a second fixing plate of a friction stir welding tool capable of adjusting the length of a probe according to the first embodiment.

Like the first fixing plate 150, the second fixing plate 160 has a regular octagonal planar shape, and a shoulder insertion groove 161 is provided in the center of the lower end.

The third fixing plate 170 is a part that adjusts the protruding length of the probe 130 and is installed on the second fixing plate 160 of the fixing plate receiving portion 142 of the support holder 140.

8A and 8B are plan and longitudinal sectional views of a third fixing plate of a friction stir welding tool capable of adjusting the length of a probe according to the first embodiment.

The third fixing plate 170 has a regular octagonal planar shape, like the first fixing plate 150 and the second fixing plate 160, and an adjustment screw hole 171 is provided in the center.

9A and 9B are plan and longitudinal cross-sectional views of an adjustment bolt of a friction stir welding tool capable of adjusting the length of a probe according to the first embodiment.

The adjustment bolt 180 is a part that adjusts the protruding length of the probe 130 and is fastened to the adjustment screw hole 171 of the third fixing plate 170.

The fixing bolt 190 is a portion that fixes the first fixing plate 150, the second fixing plate 160, and the third fixing plate 170 to the support holder 140, and penetrates the lower end of the support holder 140 to provide a first It is fastened to the fixing plate 150, the second fixing plate 160, and the third fixing plate 170 in order.

The friction stir welding tool 100 capable of adjusting the length of the probe according to the first embodiment of the present invention can maintain uniform welding quality by adjusting the protrusion length of the probe worn during the friction stir welding process.

10 is a diagram illustrating a process of adjusting the protruding length of the probe of the friction stir welding tool capable of adjusting the length of the probe according to the first embodiment.

When friction stir welding is performed in the state of the initial probe protrusion length H as shown in FIG. 10A, the probe 130 is worn and the probe protrusion length is shortened, thereby deteriorating the welding quality.

In the friction stir welding tool 100 capable of adjusting the length of the probe according to the first embodiment of the present invention, the probe 130 is worn during the friction stir welding process, and the initial probe protrusion length H as shown in FIG. 10B. When the probe protrusion length is shorter, the reduced probe protrusion length Hw is elongated to the initial probe protrusion length H, so that welding quality is not deteriorated.

When adjusting the extension of the reduced probe protrusion length (Hw) to the initial probe protrusion length (H), the probe 130 and the support holder 140 are separated from the shank 110 as shown in FIG. 10(c), and then FIG. 10 As shown in (d) of, the probe 130 is lowered through the adjustment bolt 180.

After adjusting the extension of the reduced probe protrusion length (Hw) to the initial probe protrusion length (H), insert the shank 110 into the support holder 140 as shown in FIG. 10(e), and connect the shank of the probe 130 The head 131 is coupled to the probe connection 112 of the shank 110.

11A and 11B are longitudinal cross-sectional views of a friction stir welding tool capable of adjusting the length of a probe according to a second embodiment of the present invention, and FIGS. 12A and 12B are a frictional stir welding tool capable of adjusting the length of the probe according to the second embodiment. A plan view and a longitudinal sectional view of the third fixing plate of the stirring welding tool, and FIGS. 13A and 13B are front and front views of the control disk of the friction stir welding tool capable of adjusting the length of the probe according to the second embodiment.

The friction stir welding tool 100 capable of adjusting the length of the probe according to the second embodiment of the present invention has a shape such that the protruding length of the probe can be adjusted through the control plate 180 ′.

The friction stir welding tool 100 capable of adjusting the length of the probe according to the second embodiment of the present invention has a regular octagonal planar shape like the first fixing plate 150 and the second fixing plate 160, and has a probe through hole in the center. And a third fixing plate 170 ′ having 171 ′ provided thereon, and an adjustment disk 180 ′ having a probe through hole 181 ′ in the center thereof.

In the friction stir welding tool 100 capable of adjusting the length of the probe according to the second embodiment of the present invention, the outer diameter of the adjustment disk 180 ′ passes through the probe formed in the center of the third fixing plate 170 ′ as shown in FIG. 11A. It is formed larger than the hole 171 ′ and is formed smaller than the probe through hole 171 ′ formed in the center of the third fixing plate 170 ′ or in contact with the upper end of the third fixing plate 170 ′, as shown in FIG. It is in contact with the upper end of the fixing plate 160.

14 is a diagram illustrating a process of adjusting the protruding length of the probe of the friction stir welding tool capable of adjusting the length of the probe according to the second embodiment.

The friction stir welding tool 100 capable of adjusting the length of the probe according to the second embodiment of the present invention is also used as the friction stir welding tool 100 capable of adjusting the length of the probe according to the first embodiment of the present invention. By controlling the protrusion length of the probe worn during the stirring welding process, it is possible to maintain the welding quality uniformly.

When the probe 130 is worn in the process of friction stir welding using the friction stir welding tool 100 capable of adjusting the length of the probe according to the second embodiment of the present invention, it is reduced as shown in FIG. 14B. In order to adjust the extension of the protruding probe length (Hw) to the initial protruding length (H) as shown in Figure 14 (a), the shank 110 is separated from the probe 130 and the support holder 140, and then the probe ( 130) is removed from the shoulder 120, and at least one of the plurality of control discs 180' installed on the upper end of the third fixed disc 170' is removed or replaced with a thin one, and then the probe 130 and When the shank 110 is coupled, the initial probe protrusion length H can be adjusted as shown in (c) of FIG. 14.

As described above, in the friction stir welding tool 100 capable of adjusting the length of the probe according to the present invention, when the probe 130 is worn during the friction stir welding process and the protruding length of the probe 130 is shortened, the probe 130 through the length adjusting means. ) By adjusting the protruding length, it is possible to maintain the joint quality uniformly.

In addition, since the friction stir welding tool 100 capable of adjusting the length of the probe according to the present invention can continue to be used without discarding the worn probe 130, economic use of the probe 130 can be achieved.

Although the invention made by the present inventor has been described in detail according to the above embodiment, the invention is not limited to the above embodiment, and can be changed in various ways without departing from the gist of the invention.

100: Friction stir welding tool with adjustable probe length
110: shank
120: shoulder
130: probe
140: support holder
150: first fixed plate
160: second fixed plate
170, 170': 3rd fixed edition
180: adjustment bolt
180': control disc
190: fixing bolt

Claims (5)

A shank 110 provided with a probe connection part 112 on which the probe 130 is detachably installed at the lower end of the support holder insertion part 111;
A shoulder 120 inserted and installed around the lower circumference of the probe 130;
A probe 130 detachably installed at the lower end of the shank 110;
A support holder 140 installed under the shank 110, provided with a shank insertion portion 141 at an upper portion of the shank, and provided with a fixing plate receiving portion 142 at the lower portion thereof;
A first fixing plate 150 installed at the lower end of the fixing plate receiving portion 142 of the support holder 140 and fixing the shoulder 120;
A second fixing plate 160 installed on the first fixing plate 150 of the fixing plate receiving portion 142 of the support holder 140 and fixing the shoulder 120;
A third fixing plate 170 installed on the second fixing plate 160 of the fixing plate receiving part 142 of the support holder 140;
Adjustment bolt 180 is screwed to the third fixing plate 170 to adjust the protruding length of the probe 130;
Friction agitation capable of adjusting the length of the probe, comprising: fixing bolts 190 for fixing the first fixing plate 150, the second fixing plate 160, and the third fixing plate 170 to the support holder 140 Welding tools. The method of claim 1,
A plurality of cooling air circulation holes 113 are provided in the vertical direction in the support holder insert 111 of the shank 110,
A friction stir welding tool capable of adjusting the length of the probe, characterized in that a cooling air inlet hole 144 connected to the shank insertion part 141 is provided on one outer side and the other side of the support holder 140. The method of claim 1,
Fitting grooves 121 are provided on both sides of the outer circumference of the upper end of the shoulder 120,
The first fixing plate 150 has a shape that can be cut in half and separated left and right,
A fitting hole 151 is provided in the center of the first fixing plate 150 to be inserted into the fitting groove 121 of the shoulder 120,
A friction stir welding tool capable of adjusting the length of the probe, characterized in that a shoulder insertion groove 161 is provided in the center of the lower end of the second fixing plate 160. A shank 110 provided with a probe connection part 112 on which the probe 130 is detachably installed at the lower end of the support holder insertion part 111;
A shoulder 120 inserted and installed around the lower circumference of the probe 130;
A probe 130 detachably installed at the lower end of the shank 110;
A support holder 140 installed under the shank 110, provided with a shank insertion portion 141 at an upper portion of the shank, and provided with a fixing plate receiving portion 142 at the lower portion thereof;
A first fixing plate 150 installed at the lower end of the fixing plate receiving portion 142 of the support holder 140 and fixing the shoulder 120;
A second fixing plate 160 installed on the first fixing plate 150 of the fixing plate receiving portion 142 of the support holder 140 and fixing the shoulder 120;
A third fixing plate 170 ′ installed on the second fixing plate 160 of the fixing plate receiving portion 142 of the support holder 140;
An adjustment disk 180 ′ that is installed on the upper end of the third fixing plate 170 ′ or on the upper end of the second fixing plate 160 to adjust the protruding length of the probe 130;
Friction agitation capable of adjusting the length of the probe, comprising: fixing bolts 190 for fixing the first fixing plate 150, the second fixing plate 160, and the third fixing plate 170 to the support holder 140 Welding tools. The method of claim 4,
The outer diameter of the control disk 180 ′ is formed larger than the probe through hole 171 ′ formed in the center of the third fixing plate 170 ′ and contacts the upper end of the third fixing plate 170 ′ or the third fixing plate 170 ′. ). A friction stir welding tool capable of adjusting the length of the probe, characterized in that it is formed smaller than the probe through hole 171 ′ formed in the center of the probe to contact the upper end of the second fixing plate 160.

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