KR101616753B1 - Portable type friction stir welding device - Google Patents

Abstract

The present invention relates to a portable friction stir welding apparatus capable of selectively extending the travel distance of a welding head while simplifying a mechanical structure, and more particularly to a portable friction stir welding apparatus for welding a joint member ; And a pair of first guide frames formed on the first bed and guiding the progress of the joining head along the joining portion in the friction stir joining A first base; And a second bed, one end of which is connected to the other end of the first bed to fix the member to be joined together with the first bed when the length of the joint is longer than the length of the first base, And a second base having a pair of second guide frames connected to the other end of the guide frame to guide the progress of the joint head together with the first guide frame when friction stir welding is performed.

Description

[0001] PORTABLE TYPE FRICTION STIR WELDING DEVICE [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable friction stir welding device, and more particularly, to a portable friction stir welding device that can selectively extend the travel distance of a welding head while simplifying a mechanical structure.

Lightweight alloys utilizing lightweight materials are widely used in various industrial fields such as transportation equipment such as automobiles, aircrafts and ships, and construction and civil engineering fields. Assembly of various devices and structures using such a lightweight alloy is performed by a bonding process.

Friction Stir Welding (FSW) has been developed and applied as a technique for joining the above-described lightweight alloys.

When the non-consumable rotary tool, which is a hard material, is brought into contact with the abutting surface of the abutting members while rotating at a higher speed than the abutting member to be bonded, heat is generated due to mutual friction between the rotating tool and the abutting member, The material of the joining member is softened and the joining members are joined on the principle that the materials on both sides of the joining face are forcibly mixed due to the plastic flow of the material by the stirring of the rotary tool. Since such a friction stir joining does not involve melting of the joining member It is possible to prevent welding defects occurring in conventional melting welding, and also, since harmful substances are not discharged during the bonding process, they are widely used as eco-friendly adapters.

As a device for performing the friction stir welding, there can be used an apparatus for performing friction stir welding such as "Korean Registered Patent No. 1143941 (Registered Date: 2012. 05. 08, Name: Friction Stir Welding Apparatus for Straight Welding)", Korean Registered Patent No. 0500514 ("Gantry Type Friction Stir Welding Apparatus"), Registered in the Republic of Korea No. 1067864 (Registered on Mar. 20, 2011, entitled "Gantry Type Friction Stir Welding Apparatus"), and Korean Registered Patent No. 0970518 (registered on June 07, 2010, name: Linear Friction Welding Apparatus and Method).

However, the devices disclosed in the above-mentioned patents have a problem of occupying an occupied space widely because of the large mechanical structure regardless of the size of the non-bonded material, thereby increasing the manufacturing cost of the device.

Further, in order to move the conventional friction stir welding apparatuses to other workplaces, it is necessary to disassemble and move the assemblies, and then reassemble the assemblies, so that the movement of the assemblies is not smooth and highly skilled workers are required to disassemble and assemble the assemblies There was another problem.

In addition, since the conventional friction stir welding apparatus is provided with a limited distance of the welding head on which the friction stir welding tool is mounted, it is necessary to manufacture the welding arm in order to join the welding object longer than the travel distance of the welding head There was another problem.

SUMMARY OF THE INVENTION It is a first object of the present invention to provide a portable type friction material which can be used in a narrow working space and can increase the space utilization of a work place, And to provide a stirring and bonding apparatus.

It is a second object of the present invention to provide a method and apparatus for selectively extending the travel distance of a bonding head on which a friction stir welding tool is mounted so that a material to be bonded having various bonding lengths can be bonded And a friction stir welding device.

The technical objects to be achieved by the present invention are not limited to the above-mentioned technical problems.

According to an aspect of the present invention, there is provided a portable friction stir welding apparatus comprising: a joint head for joining an abutting joint portion of a member to be welded in a friction stir welding manner; And a pair of first guide frames formed on the first bed and guiding the progress of the joining head along the joining portion in the friction stir joining A first base; And a second bed, one end of which is connected to the other end of the first bed to fix the member to be joined together with the first bed when the length of the joint is longer than the length of the first base, And a second base having a pair of second guide frames connected to the other end of the guide frame to guide the progress of the joint head together with the first guide frame when friction stir welding is performed.

Specifically, the first bed has a flat plate shape and extends horizontally, and a first bonding working position line is formed on an upper surface along a virtual center line bisecting the first bed in the longitudinal direction, A second joining operation position line is formed along an imaginary center line bisecting the second bed in the longitudinal direction so as to be continuous with the first joining operation position line on the upper surface.

Specifically, the first guide frame horizontally extends along the longitudinal direction of the first bed at both sides of the upper surface of the first bed, and a first guide rail extending along the longitudinal direction of the first guide frame is mounted on the upper surface, The second guide frame horizontally extends along the longitudinal direction of the second bed at both sides of the upper surface of the second bed, and a second guide rail extending along the longitudinal direction of the second guide frame is mounted on the upper surface.

Wherein one end of each of the second guide rails extends outwardly from one end of the second guide frame and the first guide rail has a length shorter than the length of the first guide frame so that the second guide rail can be extended over the first guide frame / RTI >

Each of the first guide frames is disposed on the first bed so as to be able to ascend and descend, a first elevating cylinder is mounted on one end of each first guide frame, and on the outer side adjacent to the other end of each first guide frame, Two lift cylinders are mounted, and the extended end of the first lift cylinder rod of each first lift cylinder and the extended end of the second lift cylinder rod of each second lift cylinder are fixed on the upper surface of the first bed.

Each of the second guide frames is disposed on the second bed so that the other end of the first guide frame adjacent to one end of each second guide frame is flanged, An elevating cylinder is mounted, and the extending end of the third elevating cylinder rod of each third elevating cylinder is fixed on the upper surface of the second bed.

On the other hand, the splicing head includes a spindle assembly equipped with a friction stir tool for performing friction stir welding on the splice; And moving means for moving the spindle assembly up and down along the first and second guide frames.

Specifically, the moving means includes a bottom plate, a ceiling plate spaced apart from the top of the bottom plate, and a plurality of support plates vertically connecting the bottom plate and the edge portions of the ceiling plate, A support frame guided along the support frame; A lift frame disposed between the bottom plate and the ceiling plate and slidably fitted to each support plate so as to be able to move up and down through the bottom plate ; A first driving motor mounted on an upper surface of the ceiling plate to elevate the elevating frame; And a second drive motor mounted on the bracket extended from the bottom plate so as to be exposed on the upper surface of any one of the first guide frames to move the support frame along the first and second guide frames, A ball screw shaft, which is fastened to the nut block mounted on the lifting frame and is rotatably supported by the ceiling plate and the bottom plate, is mounted on the rotary shaft of the motor. A pinion is mounted on the rotary shaft of the second driving motor, A rack in which the pinions are engaged is formed along the longitudinal direction of the first and second guide frames on both sides of the lower surface of the bottom plate, A pair of first guide blocks to be mounted are mounted.

Specifically, the spindle assembly includes: a spindle vertically disposed in a vertical cylindrical spindle housing, the spindle assembly having an upper peripheral surface mounted on the lifting frame and a lower portion extending through the lifting frame and the bottom plate; And a third drive motor mounted on the upper surface of the lift frame, the rotation axis of which is connected to the upper portion of the spindle exposed to the upper portion of the spindle housing.

More specifically, a chuck mounted on the lower portion of the spindle is mounted to the lower portion of the spindle housing, and a tool for friction stir welding is mounted on the chuck.

As described above, the portable friction stir welding device according to the present invention has an advantage in that it can be used in a narrow working space because the overall size is reduced, and the space utilization of the workplace can be increased.

Further, the portable friction stir welding device according to the present invention has an advantage that it is possible to easily move the equipment without disassembly by simplifying the mechanical structure.

In addition, since the friction stir welding apparatus according to the present invention can selectively extend the travel distance of the welding head, there is an advantage that a work to be welded having various welding lengths can be bonded by using one equipment.

1 is a front view showing a portable friction stir welding apparatus according to the present invention,
FIG. 2 and FIG. 3 are views showing a state in which the auxiliary bed is connected to the main bed shown in FIG. 1,
4 is an enlarged view of the bonding head shown in Fig. 1, and Fig.
5 is an enlarged view of the spindle assembly shown in Fig.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same components are denoted by the same reference symbols whenever possible. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

FIG. 1 is a view showing a portable friction stir welding apparatus according to the present invention. In the portable friction stir welding apparatus 100 according to the present invention, a joint head portion for joining a joint portion of an object to be abutted by a friction stir welding method And a first base 110 for guiding the progress of the joining head 150 along the joining portion in the friction stir joining while fixing the joining portions of the members to be bonded to each other.

The portable friction stir welding machine 100 according to the present invention may further include a first base 110 connected to the other end of the first base 110 when the length of the joint is longer than the length of the first base 110, And a second base 130 for guiding the progress of the joining head 150 along the joining portion while fixing the joining material.

First, the first base 110 includes a first bed 112 for fixing the bonding portions of the materials to be bonded on the upper surface so as to be brought into contact with each other, a second bed 112 formed on the first bed 112, And a pair of first guide frames 116 for guiding the progress of the head unit 150.

The first bed 112 extends horizontally with a flat plate shape as shown. On the upper surface of the first bed 112, a first bonding operation position line 114 is formed along a virtual center line bisecting in the longitudinal direction of the first bed 112, And is formed along the position line 114. A clamp (not shown) for press-fixing one end top surface and the other end top surface of the member to be joined is detachably fixed on the first bed 112 on both sides of the first joining operation position line 114. Here, the clamp (not shown) for press-fixing the material to be bonded is a well-known technology, and a detailed description thereof will be omitted.

The first guide frame 116, which is provided as a pair, horizontally extends along the longitudinal direction of the first bed 112 on both sides of the upper surface of the first bed 112. A first guide rail 118 extending along the longitudinal direction of the first guide frame 116 is mounted on the upper surface of each first guide frame 116. The bonding head part 150 is slidably seated on the pair of first guide rails 118 thus formed and the bonding head part 150 is moved along the first guide rail 118 when the friction stir welding is performed.

On the other hand, between the lower portion of each first guide frame 116 and the upper portion of the first bed 112, a member to be joined having a variety of thicknesses or a member to be joined through friction stir joining enters and exits, Or the first guide frames 116 are arranged so as to be able to move up and down so that the joints can go in and out. To this end, a first elevating cylinder 120 is mounted on one end of each first guide frame 116, and a second elevating cylinder 122 is mounted on the outer side adjacent to the other end of each first guide frame 116 do. At this time, the extended end of the first lifting cylinder rod 124 extended or contracted by the operation of each first lifting cylinder 120 is fixed on the upper surface of the first bed 112, and similarly, An extended end of the second lift cylinder rod 126, which is extended or contracted by the operation of the cylinder 122, is fixed on the upper surface of the first bed 112. The first and second lift cylinders 120 and 122 mounted on any one of the first guide frames 116 and the other first and second lift cylinders 120 and 122 mounted on the first guide frame 116 The first and second lifting cylinders 120 and 122 operate in conjunction with each other. When the first and second lifting cylinder rods 124 and 126 are extended by the operation of the first and second lifting cylinders 120 and 122, Since the extended ends of the rods 124 and 126 are fixed to the first bed 112, the respective first guide frames 116 rise together with the first and second lift cylinders 120 and 122. On the contrary, when the first and second lifting cylinder rods 124 and 126 are retracted by the operation of the first and second lifting cylinders 120 and 122, each first guide frame 116 is retracted from the first and second lifting cylinders 120 and 122, (120, 122).

The bonding head 150 is slidably disposed on the first base 110 and the second base 130 is selectively connected to the other end of the first base 110.

2 shows a state in which the second base is connected to the first base, and the second base 130 includes a second base (not shown) such as a first base 110 for fixing the joining portions of the members to be bonded on the upper surface, And a pair of second guide frames 136 formed on the second bed 132 and guiding the progress of the joining head 150 along the joining portions when friction stir welding is performed.

The second bed 132 has a flat plate shape and extends horizontally like the first bed 112. One end of the second bed 132 is brought into contact with the other end of the first bed 112. On the upper surface of the second bed 132, a first bonding operation position line 114 and a second bonding operation position line 134 are formed. The second bonding operation position line 134 is formed along a virtual center line bisecting the second bed 132 in the longitudinal direction like the first bonding operation position line 114. On the other hand, on both sides of the second joining operation position line 134, the other end of the member to be joined, which has the same configuration as the clamp (not shown) provided on the first bed 112 and extends toward the second bed 132, (Not shown) for releasably securing the second bed 132 to the second bed 132. [0050]

Preferably the second bed 132 is provided with a length that is less than the length of the first bed 112 or a length that is greater than the length of the first bed 112 or a length that is the same as the length of the first bed 112 . More preferably, the thickness of the second bed 132 is provided to the same thickness as the thickness of the first bed 112.

The second guide frame 136 provided as a pair extends horizontally along the longitudinal direction of the first bed 132 at both sides of the upper surface of the second bed 132. On the upper surface of each second guide frame 136, a second guide rail 138 extending along the longitudinal direction of the second guide frame 136 is mounted. One end of each of the second guide frames 136 thus formed is connected to each of the first guide frames 116 as shown in the figure. At this time, the second guide rails 138 formed on the second guide frames 136, 1 guide rails 118, respectively. The second guide rail 138 is connected to the first guide rail 118 so that the joining head 150 is guided along the second guide rail 138 via the first guide rail 118. The second guide rails 138 are connected to the first guide rails 118 so as to cover the first guide frames 116. To this end, one end of each of the second guide rails 138 is connected to the second guide frame And the first guide rail 118 is extended to one side of the first guide frame 116 so that the second guide rail 138 can be extended over the first guide frame 116 / RTI >

On the other hand, the pair of second guide frames 136 are arranged so as to be movable up and down like the first guide frame 116. To this end, one end of each second guide frame 136 and the other end of each first guide frame 116 are flange jointed so as not to interfere with the first and second guide rails 118 and 138, A third lifting cylinder 140, which operates in conjunction with the first lifting cylinder 120, is mounted on the other end of each second guide frame 136.

The first flange 144 and the second flange 146 are formed at one end of the other end of the first guide frame 116 and the second guide frame 136. The first flange 144 and the second flange 146, The two flanges 146 are brought into contact with each other when the second base 130 is connected to the first base 110. The first flange 144 and the second flange 146 which are in contact with each other are connected to each other by bolts. The extending end of the third lifting cylinder rod 142 extended or retracted from the respective third lifting cylinder 140 is fixedly mounted on the upper surface of the second bed 132, 130 are operated in conjunction with the first lifting cylinder 120. Here, the operation of the third lifting cylinder 130 for lifting and lowering the second guide frame 136 is the same as that of the first lifting cylinder 120, and thus a detailed description thereof will be omitted. 2 and 3 show the state where the second lifting cylinder 122 is mounted. However, when the second base 130 is connected to the first base 110, The cylinder 122 is preferably separated from the first bed 112 and the first guide frame 116.

4 and 5 show a bonding head in which the bonding head 150 includes a spindle assembly 178 on which a friction stir tool T for performing friction stir joining is mounted, And a moving means 152 for moving up and down.

The moving means 152 includes a supporting frame 154 guided along the longitudinal direction of the first bed 112 and the second bed 132, a lifting frame 164 which is vertically movable on the supporting frame 152, A first driving motor 164 for moving the lifting frame 164 up and down, and a second driving motor 172 for moving the supporting frame 154. [

The support frame 154 includes a bottom plate 156 having a horizontal rectangular plate shape and disposed above the pair of first guide rails 118 and a bottom plate 156 having a horizontal rectangular plate shape, And a plurality of support plates 160 that vertically connect the corner portions of the bottom plate 156 and the ceiling plate 158. [ At this time, a pair of first guide rails 118 and a pair of first guide blocks 162 slidably mounted on the second guide rails 136 are mounted on both sides of the bottom surface of the bottom plate 156.

The lifting frame 164 is disposed between the bottom plate 156 and the ceiling plate 158 and is slidably fitted to each support plate 160 so as to be able to ascend and descend through the bottom plate 156. The first drive motor 166 is mounted on the upper surface of the ceiling plate 158 and the first drive motor 166 is mounted with a vertical ball screw shaft 168. The ball screw shaft 168 is inserted through a nut block 170 mounted on the lifting frame 164 and rotatably supported by the ceiling plate 158 and the bottom plate 156. An elevating guide rail 165a is mounted on the supporting plate 160 slidably fitted in the lifting frame 164 along the vertical length direction of the supporting plate 160. On both sides of the lifting frame 164, And second guide blocks 165b slidably mounted on the guide rails 165a. As can be seen, the ball screw shaft 168 is rotatably connected to the rotation shaft of the first drive motor 166 by normal coupling.

On the other hand, the second driving motor 172 is mounted on one side of the bottom plate 156 so as to be exposed on the upper surface of any one of the first guide frames 116. That is, the second drive motor 172 is mounted on the bracket 173 extending from the bottom plate 156. A pinion 174 is mounted on the rotary shaft of the second drive motor 172 and a pinion 174 is mounted on the upper surfaces of the first and second guide frames 116 and 136 adjacent to the rotation axis of the second drive motor 172 138 of the first and second guide frames 118, 138 so that the first and second racks 176a, 176b to which the first and second guide rails 174, 174 engage are not interfered with the first and second guide rails 118, As shown in FIG. The spindle assembly 178 is mounted on the conveying means 152 thus formed.

The spindle assembly 178 includes a spindle 180 and a third drive motor 186 for rotating the spindle 180.

The spindle 180 is vertically disposed in a vertical cylindrical spindle housing 182 whose upper peripheral surface is mounted on the lifting frame 164 and the lower portion is extended through the lifting frame 164 and the bottom plate 156 And is rotatably supported. At this time, a chuck 184 mounted on the lower portion of the spindle 180 is mounted to a lower portion of the spindle housing 182 extending through the bottom plate 156. The friction stir tool T is mounted on the chuck 184 mounted on the lower portion of the spindle 180 so that the center of rotation of the friction stir tool T is located on the first and second beds 112 and 132 And are disposed so as to face the first and second bonding operation position lines 114 and 134 provided.

On the other hand, the third drive motor 186 is mounted on the upper surface of the lift frame 164. The third drive motor 186 mounted on the lifting frame 164 transmits the rotational force to the spindle 180. To this end, the rotational axis of the third drive motor 186 is connected to the spindle housing 182 exposed to the upper portion of the spindle housing 182 180). As can be seen, the rotation axis of the third drive motor 186 is connected to the spindle 180 by a normal coupling.

Hereinafter, the state of use of the portable friction stir welding device formed as described above will be briefly described.

In order to bond the joint portions of the two sheets of the member to be bonded together, the two members to be joined are inserted between the first guide frame 116 and the first bed 112. At this time, if the second bed 132 is connected to the first bed 112, the second elevating cylinder 122 and a clamp (not shown) provided on the other end side of the first bed 112 are separated Two pieces of the member to be joined are inserted between the upper portion of the first and second beds 112, 132 and the first and second main guide frames 116,

When the object to be joined is inserted as described above, after the jointed portion of the object to be joined is aligned with the first bonding operation position line 114, a clamp (not shown) provided to the first bed 112 is used Fix the material to be bonded. At this time, if the second bed 132 is connected to the first bed 112, the joining portion of the inserted member to be joined is aligned with the first and second joining operation position lines 114 and 1134, (Not shown) provided at the start end side of the first bed 112 and another clamp (not shown) provided at the second bed 132 at the other end upper surface of the object to be bonded And fix it.

When the first bed 112 or the bonding portions of the materials to be bonded to the first and second beds 112 and 132 are fixed in close contact with each other, the bonding head 150 is operated, And a bonding operation for the above is performed.

In order to perform joining on the abutted portions, first, the third driving motor 186 is operated to rotate the spindle 180 mounted with the friction stir tool T at a high speed. The first driving motor 166 is operated to lower the elevating frame 164 and then the second driving motor 172 is operated to transfer the bonding head unit 150. At this time, The friction stir tool T is inserted into the joint portion at a high speed by the lifting frame 164 descending by the second drive motor 172 To perform the friction stir joining on the joining portion while being guided along the first and second joining working position lines 114 and 134. [

It will be appreciated that the first drive motor 166, the second drive motor 172, and the third drive motor 186 are electrically connected to a controller (not shown) and controlled by the controller.

The portable friction stir welding apparatus 100 according to the present invention formed as described above can be used not only in a narrow work space but also in space utilization in a workplace because the overall size is reduced.

Further, the portable friction stir welding device 100 according to the present invention simplifies the mechanical structure, thereby making it possible to easily move the equipment without disassembling.

In addition, since the friction stir joining apparatus 100 according to the present invention can selectively extend the travel distance of the bonding head unit 150, it is possible to use a single equipment to join the materials W having various bonding lengths I will.

The above-described portable friction stir welding device 100 is not limited to the construction and operation of the above-described embodiments. The embodiments may be configured so that all or some of the embodiments may be selectively combined so that various modifications may be made.

100: Portable friction stir welding device 110: First base
112: first bed 114: first bonding position line
116: first guide frame 118: first guide rail
120: first elevating cylinder 122: second elevating cylinder
130: second base 132: second bed
134: second bonding position line 136: second guide frame
138: second guide rail 140: third lift cylinder
150: joining head part 152: moving means
154: support frame 156: bottom plate
158: ceiling plate 160: support plate
164: lift frame 166: first drive motor
172: second drive motor 178: spindle assembly
180: spindle 186: third drive motor

Claims (10)

A joining head portion joining the butted portions of the materials to be joined by a friction stir joining method;
And a pair of first guides formed on the first bed and guiding the progress of the joint head along the joint at the friction stir welding step, A first base having a frame; And
A second bed, one end of which is connected to the other end of the first bed to fix the object to be bonded together with the first bed when the length of the joint is longer than the length of the first base, And a second base having a pair of second guide frames, one end of which is connected to the other end of the first guide frame to guide the progress of the bonding head together with the first guide frame when friction stir welding is performed,
Wherein each of the first guide frames is disposed on the first bed so as to be able to lift,
A first elevating cylinder is mounted on one end of each of the first guide frames and a second elevating cylinder is mounted on an outer side adjacent to the other end of each of the first guide frames, Wherein the extending end of the first lifting cylinder rod and the extending end of the second lifting cylinder rod of each second lifting cylinder are fixed on the upper surface of the first bed.
The method according to claim 1,
A first bonding operation position line is formed along an imaginary center line bisecting the first bed in the longitudinal direction on the upper surface,
The second bed has a flat plate shape and extends horizontally. On the upper surface, along the imaginary center line bisecting the second bed in the longitudinal direction so as to be continuous with the first bonding operation position line, Is formed on the inner circumferential surface of the friction stir welding device.
The method according to claim 1,
The first guide frame horizontally extends along the longitudinal direction of the first bed at both sides of the upper surface of the first bed, and a first guide rail extending along the longitudinal direction of the first guide frame is mounted on the upper surface of the first guide frame ,
The second guide frame horizontally extends along the longitudinal direction of the second bed at both sides of the upper surface of the second bed and a second guide rail extending along the longitudinal direction of the second guide frame is mounted on the upper surface Wherein said friction stir welding device is a friction stir welding device.
The method of claim 3,
One end of each of the second guide rails extends outwardly from one end of the second guide frame, and the first guide rails extend from one end of the first guide frame to the first guide frame, And the length of the friction stir welding device is shorter than the length of the friction stir welding device.
delete The method according to claim 1,
Each of the second guide frames is disposed on the second bed so as to be able to lift,
The other end of the first guide frame adjacent to one end of each of the second guide frames is flanged,
And a third lifting cylinder is mounted on the other end of each of the second guide frames and an extending end of the third lifting cylinder rod of each third lifting cylinder is fixed on the upper surface of the second bed. Type friction stir welding device.
The method according to claim 1,
The bonding head portion
A spindle assembly having a friction stir tool mounted thereon for performing friction stir welding on the abutment; And
And moving means for moving the spindle assembly up and down along the first and second guide frames.
The method of claim 7,
Wherein,
A bottom plate, a ceiling plate spaced apart from the top of the bottom plate, and a plurality of support plates vertically connecting the bottom plate and the corner portions of the ceiling plate, A guided support frame;
A lift frame disposed between the bottom plate and the ceiling plate and slidably fitted to each of the support plates so as to be able to move up and down through the bottom plate;
A first driving motor mounted on an upper surface of the ceiling plate to elevate the elevating frame; And
And a second driving motor mounted on the bracket extended from the bottom plate to be exposed on the upper surface of any one of the first guide frames to move the support frame along the first and second guide frames,
A ball screw shaft which is inserted into a nut block mounted on the lifting frame and is rotatably supported by the ceiling plate and the bottom plate is mounted on a rotary shaft of the first driving motor,
Wherein a pinion is mounted on a rotary shaft of the second driving motor and a rack in which the pinion is engaged is mounted on an upper surface of the first and second guide frames adjacent to the second driving motor in a longitudinal direction of the first and second guide frames And a pair of first guide blocks slidably mounted on the first and second guide rails are mounted on both sides of the lower surface of the bottom plate.
The method of claim 8,
The spindle assembly comprising:
A spindle vertically disposed in a vertically cylindrical spindle housing extending through the lifting frame and the bottom plate, and rotatably supported by the spindle; And
And a third drive motor mounted on an upper surface of the lifting frame and having a rotation axis connected to an upper portion of the spindle exposed above the spindle housing.
The method of claim 9,
Wherein a chuck mounted on a lower portion of the spindle is mounted to a lower portion of the spindle housing, and the friction stir tool is mounted on the chuck.

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