JP2003260573A - Spot welding system and body structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spot welding system capable of frictional agitation of an overlapped bonding material to automatically make a spot welding by placing it on a surface plate even if it has a curved shape. <P>SOLUTION: The spot welding system is provided with a surface plate 6 on which the bonding material is placed, a moving means 7 transferring the bonding material to a given feed direction, and mounts 4, 5 movably-placing the bonding material on both inlet and outlet sides of the surface plate 6. A spot-welded head 2 is inclinably, traversably and lengthwise movably installed in a gantry frame 1. The gantry frame 1 is horizontally-movable. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spot welding system for performing spot welding of a friction stir system (friction stir spot welding) by superposing a plurality of materials to be welded, and a structure manufactured by the system. The present invention relates to a spot joining system for joining a long plate material (material to be joined) having a curved surface portion and a structure manufactured by the system.

[0002]

2. Description of the Related Art Conventionally, when manufacturing a long plate member having a curved surface portion, a metal plate is placed on a surface plate having a curved surface portion corresponding to the curved surface portion to form a welding structure. The method of manufacturing is known as described in JP-A-3-75279. A method of performing friction stir spot welding by stacking a plurality of thin flat plates is also disclosed.
It is already known as disclosed in Japanese Patent No. 314982.

Further, as shown in FIG. 12, a gate type frame 10 for moving a butt portion K'of two works K (materials to be joined) placed on a flat bed 101 in a longitudinal direction X.
The splicing head 1 mounted on the second horizontal frame portion 102a
It is also known to perform friction stir welding by means of 05, and the welding head 105 is provided so as to be movable in the lateral direction Y and movable up and down in the vertical direction Z via the movable member 104. As described above, for example, JP-A 2000-135577 discloses that the abutting portions of the materials to be welded placed on the flat bed are welded by the friction stir method.

The recently developed spot joining method using the friction stir method has the advantages that a large amount of electric power is not required and consumables are not generated. Further, the joining portions can be arranged freely and they are joined close to each other. It is also possible, and since it can be used as an exterior plate without leaving an impression or the like at the joint portion, its use has recently been considered promising.

[0005]

Therefore, when a plurality of superposed materials (metal plates) are spot-joined by a friction stir method, a spot welding system capable of automatic and continuous spot welding is developed. Is desired.

An object of the present invention is to employ a friction stir type spot welding method that does not require a large amount of electric power and does not generate consumables when spot welding by superposing a plurality of materials to be welded. A spot joining system capable of joining continuously and automatically and an assembly manufactured by the system.

[0007]

In order to achieve the above-mentioned object, the invention of claim 1 is a spot joining system for spot-joining a plurality of members to be joined by superimposing them on each other. A surface plate, a gate frame arranged so as to straddle the surface plate, and mounted on the gate frame,
A spot welding head for performing friction stir spot welding of the material to be welded placed on the surface plate, moving means for moving the material to be welded in a predetermined feeding direction, and both sides of an inlet side and an outlet side of the surface plate And a mounting table for guiding the material to be joined.

According to the invention of claim 1 having the above-mentioned structure, the material to be joined is placed on the surface plate and is moved by the moving means in a predetermined feeding direction (direction from the inlet side to the outlet side of the surface plate). While moving, the friction stir spot welding can be stably performed by the spot welding head mounted on the portal frame. Therefore, automation of friction stir spot welding is realized.

According to a second aspect of the present invention, the material to be joined is a plate material having a curved surface portion, and the surface plate and the mounting table are
It is characterized by having a curved support portion corresponding to the curved portion of the material to be joined.

According to the invention of claim 2 having the above-mentioned structure, it is possible to perform friction stir spot welding between plate materials (materials to be bonded) having at least a part having a curved surface portion. Therefore, it becomes possible to perform stable friction stir spot joining of a plate material such as an exterior material having a curved surface at least in part.

According to a third aspect of the present invention, the spot welding head is configured to be traversable and tiltable in a direction orthogonal to the feed direction of the materials to be welded, and to be vertically movable, and the gate frame. Is movable in the feed direction of the materials to be joined.

According to the invention of claim 3 having the above-mentioned structure, the material to be bonded can be moved by the moving means, and the gate frame moves to move the spot bonding head itself to move the material to be bonded. It can be moved in the same direction as the direction. Therefore, it is possible to perform spot welding regardless of the length of the material to be welded, from the material to be welded having a short length to the material to be welded having a long length, without being limited to the moving range of the portal frame.

According to a fourth aspect of the present invention, the moving means performs a feeding operation of a predetermined pitch by gripping an end portion of the material to be welded placed on the surface plate or the mounting table. .

According to the invention of claim 4 having the above-mentioned structure, the end portion of the material to be joined can be firmly gripped when the material to be joined is moved or spot-joined. Further, since it is possible to feed at a predetermined pitch, it is possible to perform spot joining at a predetermined position with a predetermined pitch interval and with high precision.

According to a fifth aspect of the present invention, there is provided a spot joining system in which a plurality of materials to be joined having a curved surface portion are overlapped and spot-joined, and a curved support portion corresponding to the curved surface portion of the material to be joined. A surface plate on which the material to be welded is placed, a gate-shaped frame disposed so as to straddle the surface plate, and a welded member mounted on the gate-shaped frame and placed on the surface plate The platen has a spot welding head for friction stir spot welding of materials, a moving means for moving the materials to be welded in a predetermined feeding direction, and a curved support portion corresponding to a curved portion of the materials to be welded. A mounting table for guiding the material to be joined on both sides of the inlet side and the outlet side of
The spot welding head is capable of traversing and tilting in a direction orthogonal to the feed direction of the materials to be welded, and is configured to be vertically movable, while the gate frame is fixed at a fixed position. It is characterized by

According to the invention of claim 5 having the above-mentioned structure, even if the gate-shaped frame is fixed at a fixed position, the members to be joined on the mounting table can be moved by the moving means, which is long. Spot welding can also be performed on materials to be welded with dimensions.

According to a sixth aspect of the present invention, there is provided a spot joining system for spot-joining a plurality of materials to be joined, each of which has a curved surface portion, by superposing, and a supporting portion having a curved surface shape corresponding to the curved surface portion of the material to be bonded. A surface plate on which the material to be welded is placed, a gate-shaped frame disposed so as to straddle the surface plate, and a welded member mounted on the gate-shaped frame and placed on the surface plate A spot welding head for friction stir spot welding of materials, the spot welding head being capable of traversing and tilting in a direction orthogonal to the feeding direction of the materials to be welded, and vertically movable. On the other hand, the portal frame is configured to be movable in the feed direction of the materials to be joined.

According to the invention of claim 6 having the above-mentioned structure, since the portal frame itself on which the spot joining head is mounted is movable, even if the material to be spot-joined has a long dimension, Spot joining can be performed by moving the gate-shaped frame.

According to a seventh aspect of the present invention, which has the above-mentioned structure, the structure is manufactured by the spot joining system according to any one of the first to sixth aspects. For example, a structure for a long vehicle such as an automobile or a train can be produced by friction stir spot welding.

The invention of claim 8 is characterized in that the surface on the side of spot joining is used as the inner surface and the surface on the side of the surface plate is used as the outer surface.

According to the invention of claim 8 having the above-mentioned structure, a structure having a flat surface which can be used as an outer surface of a long vehicle structure such as an automobile or a train is continuously produced by friction stir spot welding. You can

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the spot joining system of the present invention will be described below with reference to FIGS.

FIG. 1 is a perspective view showing the entire spot joining system of the present invention, FIG. 2 is a plan view showing the entire system, FIG. 3 is a side view thereof, and FIG. 4 is a front view thereof. 5 is an enlarged perspective view showing the moving means, FIG. 6 is an enlarged side view of the spot joining head, and FIG. 7 is an enlarged front view of the spot joining head. 8A and 8B show an embodiment of a plunge amount control device for a spot joining head, FIG. 8A is a side view showing a main portion, and FIG. 8B is a block diagram showing a control flow. Figure 9
Shows another embodiment of the plunge amount control device of the spot joining head, (a) is a side view showing a main part, and (b) is a block diagram showing a control flow.

First, the spot joining system will be described with reference to FIGS. The spot welding system of the present invention has a gate-shaped frame 1 on which a friction stir spot welding head 2 is mounted, and the gate-shaped frame 1 is provided so as to be movable on a rail 3 in the horizontal direction (X direction in FIG. 1). Has been.
Then, the spot welding head 2 is moved by the movement of the gate-shaped frame 1, so that a predetermined position of the material to be welded placed on the surface plate 6 is spot-welded. In this example, two joined materials, that is, the upper plate P1 and the lower plate P
Although the two are superposed on each other by spot joining, three or more plates can be superposed on each other by spot joining.

The spot joining head 2 can traverse the portal frame 1 in the lateral direction (Y direction in FIG. 1) and can move up and down in the vertical direction (Z direction in FIG. 1).

Therefore, if the lengths of the materials to be joined are so short that they can all be placed on the surface plate 6, all that is required is to move the portal frame 1 in the X direction (see FIG. 1). It is possible to perform spot joining at a necessary place of. However, when the length of the material to be joined is longer than the surface plate 6, the gate type frame 1
Since it is not possible to carry out spot joining to all the necessary parts only by moving the, the material to be joined itself must be moved in the X direction. Therefore, in this example, the surface plate 6
Mounting tables 4 and 5 are provided on the inlet side and the outlet side, respectively, and moving means 7 for moving the material to be welded mounted on the mounting tables 4 and 5 are arranged.

The plate members P1 and P2 (materials to be joined) placed on the inlet side placing table 4 and the surface plate 6 are held by the moving means 7 at their end portions and sent by a predetermined pitch. The spot welding head 2 that has moved to the welding position descends with respect to the material to be welded stopped at the predetermined position, performs friction stir spot welding, and raises the spot welding head 2 after the welding is completed. Then, the pitch feed of the materials to be welded or the movement of the spot welding head 2 is executed, and the next friction stir spot welding is performed. By repeating such an operation, friction stir spot welding is performed at all required positions in the longitudinal direction of the material to be welded.

The inlet side mounting table 4 and the outlet side mounting table 5 are respectively provided with moving means 7 for gripping and moving the material to be welded, so that the material to be welded can be moved in cooperation with each other. There is. The moving means 7 does not necessarily have to be provided on the inlet-side mounting table 4 and the outlet-side mounting table 5, and the materials to be bonded are moved on the surface plate 6 to perform spot bonding over the entire length thereof. If it is possible, it may be provided only for one of the mounting tables 4 and 5.

The moving means 7 will be described with reference to FIGS. The material to be joined is placed on the inlet-side placement table 4 and the moving means 7 is set. The material to be joined is an upper plate material P1 and a lower plate material P2 that are superposed on each other, and each is a plate material having a curved surface portion.

The entrance-side mounting table 4 is partially formed with a curved surface portion corresponding to the curved surface portion of the material to be joined, and a large number of rolling wheels 41, which are rolling balls, are formed on the upper surface thereof. Materials to be joined (plate materials P1, P
2) is configured so as to have a transport function that can be freely moved.

When gripping and transporting each end of the materials to be joined, the moving means 7 shown in FIG. 5A is effective, and the ball screw 75 mounted in the moving guide 71 is rotated. Thus, the screw block 74 can be moved linearly. By linearly moving the grip portion 73 and the arm portion 72, which are integrally formed with the screw block 74, the material to be joined is moved in the horizontal direction. Incidentally, 7
Reference numeral 6 is a guide guide for guiding the linearly moving arm portion 72, and is constituted by arranging a large number of rolling bearings, but another method that allows movement (transportation) with low friction may be used.

The grip portion 73 has a U-shaped cross section, and is constructed such that the upper plate member P1 and the lower plate member P2 are mounted and then fixed by a set screw. It may be fixed to the above, or may be an air chuck system.

The moving means 7 for holding and moving the respective end portions of the materials to be joined is constructed so that accurate pitch feeding can be performed.

The moving means 7A shown in FIG. 5 (b) is for holding and moving the end of the intermediate portion of the material to be joined,
The moving guides 71 are arranged on both sides of the machine base, and the connecting arms 72a can be horizontally moved via the screw blocks 74 between the moving guides 71. The screw block 74 linearly moves by the rotation of the ball screw 75. The vertical member 73b is provided at a predetermined position of the connecting arm portion 72a.
And a gripping member 73a are integrally provided, and are configured to grip and feed the rear end of the materials to be joined.

If the moving means 7A is adopted, it can be held at any position of the rear end of the materials to be joined, and the upper plate P1 can be held.
The place to be gripped can be selected by a combination of the lower plate member P2 and the lower plate member P2. However, depending on the size of the gripping member 73a, it is necessary to secure a traveling space in which the gripping means 73a moves. In that case, a step may be provided on the upper surface of the mounting table 4 to allow the gripping means 73a to travel, or the mounting table may be divided into two mounting tables 4a and 4b to provide a moving space. Which of the moving means 7 and the moving means 7A is used depends on the shape or combination of the upper plate P1 and the lower plate P2 of the material to be joined.

The spot bonding head 2 will be described with reference to FIGS. 6 and 7. A bracket 25a is mounted on the gate-shaped frame 1 so as to traverse in a direction orthogonal to the feeding direction of the materials to be joined, and the pivot shaft 24 is attached to the bracket 25a.
A linear guide 23d, a guide member 23c, and a mounting plate 25b are arranged via g. The mounting plate 25b
A rotary tool 21 which is a spot welding tool, a motor 22a for rotating the rotary tool 21, and an air cylinder 23a for vertically moving the rotary tool 21 are integrally provided in the machine, and the rotary tool 21 is rotated while being welded. It is configured to press against the material. A servo motor 24a is also arranged on the bracket 25a. This servo motor 2
The driving force of 4a is transmitted to the worm 24e via the pulley 24b, the transmission belt 24c and the pulley 24d,
It is used to rotate the worm wheel 24f. Since the linear guide 23d, the guide member 23c and the mounting plate 25b are integrally provided on the pivot shaft 24g of the worm wheel 24f, the spot welding head 2 is rotated by the rotation of the servo motor 24a. Therefore, the servo motor 24a allows the spot welding head 2 to maintain a state in which the head is swung by a predetermined angle with respect to the vertical direction.
Spot joining can be performed by inclining at a predetermined angle with respect to the vertical direction.

The joining head 2 is vertically movable together with the mounting plate 25b by the expansion and contraction of the piston rod 23b of the air cylinder 23a arranged above the linear guide 23d.

The joining head 2 has a motor 22a at the top.
The rotary tool 21 is rotatably supported by the bearing 22c at the lower end thereof. The rotary tool 21 is integrally rotatably connected to the lower end of the rotary shaft 22b of the motor 22a.
The rotary tool 21 has a center pin 21b protruding from the center of the tip of a tool body 21a, and is made of a metal material that is harder and has higher rigidity than the materials to be joined.

By controlling the air cylinder 23a to control the movement amount of the piston rod 23b, the amount of protrusion of the rotary tool 21 with respect to the materials to be joined may be controlled, but in order to control the amount of protrusion more precisely. In Fig. 8
As shown in (a) and (b), the air cylinder 23a
Instead of this, it is also possible to employ a control device 80 that uses a servo motor 81 and a load cell 83.

The bonding head 2 is driven by the servo motor 81.
Move downwards. The joining head 2 is attached to the L-shaped bracket 82 so as to be slidable in the vertical direction, and a load cell 83 is interposed between the bracket 82 and the joining head 2. Then, at the time of joining work, the reaction force from the rotary tool 21 at the tip is measured by the load cell 83, and as shown in FIG. 8B, a reaction force value preset by the controller 84 and a comparator (not shown) are used. By comparison, the rotation amount of the servo motor 81 is controlled via the CPU 85. The controller 84 can arbitrarily set the optimum pressing force of the rotary tool 21. Reference numeral 81a in the drawing is a screw shaft, and reference numeral 81b is a nut.

FIG. 9 shows another embodiment of the thrust amount control device for the rotary tool 21. In this example, the rotary tool 21
A control device 80 ′ is provided for measuring and controlling the amount of plunge into the material to be joined by the distance sensor 86. Further, a pressing roller 87 is attached prior to the distance sensor 86 so that the superposed members to be joined do not float up. Therefore, the distance sensor 86 is attached to the rotary tool 21, the distance between the rotary tool 21 and the material to be welded is measured, and the distance is preset by the controller 88 and compared by a comparator.
Control 1 '. Distance information such as a measured value by the distance sensor 86 is fed back to the CPU 89.

Next, the spot joining operation will be described in more detail with reference to FIGS. The gate-shaped frame 1 has a horizontal frame portion 11 and a vertical frame portion 12, and a traveling portion 13 having wheels 14 at the front and rear is arranged. Rails 3 are laid on the floor B on both sides of the surface plate 6 in parallel with the longitudinal direction. When the wheels 14 roll on the rails 3, the gate-shaped frame 1 travels in the longitudinal direction (horizontal movement).
To do. The traveling unit 13 includes a traveling drive motor 13a and a brake 13b.

Guide rails 16 and 17 are laid laterally on the upper surface of the horizontal frame portion 11. A guide base 25 is provided along the guide rails 16 and 17, and a ball screw shaft 18 is provided immediately below the horizontal frame portion 11. It is laid across the vertical frame portions 12 on both sides. A nut portion 18c is screwed onto the ball screw shaft 18, and the nut portion 18c is rotated by a servo motor 18a mounted on each guide base 25 through an endless belt 18b at a predetermined angle in either forward or reverse directions. It is configured to rotate and stop. The guide base 25 is laterally moved to an arbitrary position by rotating the nut portion 18c screwed on the ball screw shaft 18 in a predetermined direction by the servo motor 18a.

Then, by rotating the worm 24e clockwise and counterclockwise by the servomotor 24a, the worm wheel 24f meshing with the worm 24e rotates integrally with the pivot shaft 24g, and the joining head mounted on the mounting plate 25b. 2 pivots about the central axis of the pivot 24g,
The angle is set to correspond to the joint portion located on the curved surface of the material to be joined. Note that FIG. 7 shows the joining head 2 tilting about the pivot shaft 24g.

The spot welding head 2 shown in FIG. 4 is movable laterally (Y direction) by each servo motor 18a, and the screw shaft 15a and the nut 1 are driven by the servo motor 15 installed on the upper end of the guide base 25.
It is vertically movable (Z direction) via 5b.
Further, the joining head 2 is configured to be tiltable by the servo motor 24a and vertically movable by the air cylinder 23a or the servo motor 81.

Therefore, first, the servo motor 18a performs lateral positioning, and the servo motor 15 generally performs vertical positioning. After that, the servo motor 24
The joining head 2 whose inclination is adjusted to correspond to the curved portion of the material to be joined by a is pushed down by the air cylinder 23a or the servomotor 81, and the rotary tool 21 attached to the tip of the joining head 2 is attached to the material to be joined. The spot joining is performed by pushing it against.

When the spot joining work is completed at a predetermined position, the air cylinder 23a or the servomotor 8
1, the respective bonding heads 2 are lifted and separated from the materials to be bonded. Then, the gate frame 1 is run to the next spot joining position. Alternatively, the material to be joined on the surface plate is moved horizontally by the moving means 7. By repeating this operation, spot bonding is performed at all predetermined positions in the longitudinal direction of the material to be bonded.

By the way, generally, in friction stir spot welding, the plate thickness of the material to be welded on the entry side (upper side) of the rotary tool (spot welding tool) tends to be thinner due to the welding, and the strength of that portion is likely to decrease. . Therefore, in order to eliminate such a decrease in strength, regardless of the shape of the rotary tool, the plate thickness on the entry side of the rotary tool of the material to be welded is made thicker from the beginning, so that Can be gripped.

As shown in FIG. 10, the upper plate member P1 on the entry side of the rotary tool 21 has a thick portion P1a thicker in thickness than other portions at the joining portion, and is thicker than the surrounding thickness even after spot joining. Can be configured so as not to become thin. Figure 1
1 is an example of joining the upper joined material 92 (structural plate material) to the lower joined material 91 (structural plate material), and the joining portion of the joined material 92 on the side where the rotary tool 21 enters , Fig. 11
As shown in (a), the joint portion 9 is thickened from the beginning.
2A may be used, or as shown in FIG. 11B, a strip-shaped long thick portion 92B may be formed along the joint portion. Further, as shown in FIG. 11C, each joint may be formed as an independent columnar thick portion 92C.

By doing so, it becomes possible to continuously manufacture a structure having a curved surface portion by spot joining, and to obtain a spot joining system capable of producing a product with low power consumption, no consumables, and a clean outer surface. You can It will also be possible to automatically produce the body of vehicles such as automobiles and trains, and the exterior materials of aircraft.

In the above embodiment, both the gate type frame and the material to be joined are configured to move in the feeding direction (X direction), but either one is configured to move depending on the purpose. You can also That is, the means for moving the gate-shaped frame or the means for moving the materials to be joined can be omitted.

[0052]

According to the first aspect of the present invention, a surface plate on which a plurality of superposed materials are placed, a gate frame disposed so as to straddle the surface plate, and the gate shape A configuration including a spot welding head mounted on a frame, a moving unit that moves a material to be welded in a predetermined feeding direction, and a mounting table that guides the material to be welded on both sides of an inlet side and an outlet side of the surface plate. Therefore, it is possible to accurately perform spot joining on the surface plate by the spot joining head, which is stably supported by the portal frame, while moving the joining members by the moving means.

According to the invention of claim 2, the material to be joined is a plate material having a curved surface portion, and the surface plate and the mounting table have a portion having a curved surface shape corresponding to the curved surface portion of the material to be joined. Therefore, flat plates having curved portions can be spot-joined. Therefore, it becomes possible to perform friction stir spot joining of a plate material such as an exterior material having a curved surface portion.

According to the third aspect of the present invention, the spot welding head is capable of traversing and tilting in a direction orthogonal to the feeding direction of the materials to be welded, and is vertically movable. Since the die frame is movable in the feeding direction of the material to be welded, the material to be welded can be moved by the moving means, and the spot welding head itself can be moved by the movement of the gate type frame. The range of movement is not limited, and spot welding can be performed for all the materials to be welded, from short ones to long ones.

According to the invention of claim 4, the moving means is a moving means for gripping an end portion of the material to be welded placed on the surface plate or the mounting table and performing a feeding operation at a predetermined pitch. The material to be joined can be firmly gripped when moving or joining the joining material. Further, since the predetermined pitch feed is possible, spot joining can be correctly performed at a predetermined position at a predetermined pitch interval.

According to the fifth aspect of the present invention, the spot welding head is capable of traversing and tilting in a direction orthogonal to the feeding direction of the materials to be welded, and is vertically movable and has a gate. Since the mold frame is fixed, it is possible to move the material to be welded on the surface plate by the moving means even if the gate type frame is fixed. Will also be possible.

According to the sixth aspect of the present invention, the spot welding head is configured to be traversable and tiltable in a direction orthogonal to the feed direction of the material to be welded, and vertically movable. Since the portal frame on which the joining head is mounted is movable in the feed direction of the material to be welded, the portal frame itself on which the spot welding head is mounted is movable, and the workpiece to be spot welded is spotted. Even if the length is long, it can be joined without any problem.

According to the invention of claim 7, since the structure is manufactured by the spot joining system of the present invention, a long vehicle structure such as an automobile or a train can be manufactured by spot joining.

According to the eighth aspect of the present invention, there is provided a structure in which the surface to be spot-bonded by the spot-bonding system of the present invention is an inner surface (back surface) and the surface to be mounted on the surface plate is used as an outer surface. Therefore, it becomes possible to produce a structure having a surface that can be used as an outer surface of a long vehicle structure such as an automobile or a train by spot joining.

[Brief description of drawings]

FIG. 1 is a perspective view showing an entire spot joining system according to the present invention.

FIG. 2 is a plan view showing an entire spot joining system according to the present invention.

FIG. 3 is a side view showing the entire spot joining system according to the present invention.

FIG. 4 is a front view showing the entire spot joining system according to the present invention.

FIG. 5 is an enlarged perspective view showing a moving unit.

FIG. 6 is an enlarged side view of the spot joining head.

FIG. 7 is an enlarged front view of the spot joining head.

8A and 8B show an embodiment of a plunge amount control device for a spot joining head, FIG. 8A is a side view showing a main portion, and FIG. 8B is a block diagram showing a control flow.

FIG. 9 shows another embodiment of the plunge amount control device of the spot joining head, (a) is a side view showing a main part,
(B) is a block diagram showing a flow of control.

FIG. 10 is an explanatory diagram of an example in which the thickness of the joint portion is maintained.

11 (a), (b), and (c) are explanatory views of examples in which the plate thickness does not become smaller than the surrounding plate thickness even after spot joining.

FIG. 12 is an overall perspective view of a conventional friction stir welding apparatus.

[Explanation of symbols]

1 Gate frame 2 spot joining head 3 rails 4 Entrance side mounting table 5 Exit side mounting table 6 surface plate 7 means of transportation 73 gripping member 15 Servo motor 21 rotary tool 41 rolling wheels P1 Upper plate material (material to be joined) P2 Lower plate material (material to be joined)

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hideto Nishida             3-1-1 Higashikawasaki-cho, Chuo-ku, Kobe-shi, Hyogo             No. Kawasaki Heavy Industries, Ltd.Kobe factory F-term (reference) 4E067 CA04

Claims (8)

[Claims] 1. A spot joining system for spot-joining a plurality of materials to be joined by superimposing them, wherein a surface plate on which the materials to be bonded are placed, and a gate type arranged so as to straddle the surface plate. A frame; a spot welding head that is mounted on the portal frame and that performs friction stir spot welding of the materials to be welded placed on the surface plate; and a moving unit that moves the materials to be welded in a predetermined feed direction, A spot joining system comprising: a mounting table that guides the material to be joined on both sides of an inlet side and an outlet side of the surface plate. 2. The material to be joined is a plate material having a curved surface portion, and the surface plate and the mounting table have a support portion having a curved surface shape corresponding to the curved surface portion of the material to be joined. The spot joining system according to claim 1. 3. The spot welding head is configured to be traversable and tiltable in a direction orthogonal to the feeding direction of the material to be welded, and vertically movable, and the gate frame is configured to be movable to the welded material. The spot joining system according to claim 1 or 2, wherein the spot joining system is movable in a material feeding direction. 4. The moving means grips an end portion of a material to be bonded placed on the surface plate or a mounting table and performs a feeding operation at a predetermined pitch.
The spot joining system according to any one of 1. 5. A spot joining system for spot-joining a plurality of materials to be joined, each of which has a curved surface portion, by superimposing the material to be welded, the supporting material having a curved surface shape corresponding to the curved surface portion of the material to be bonded. A surface plate on which the bonding material is placed, a gate-shaped frame arranged so as to straddle the surface plate, and a material to be welded mounted on the gate-shaped frame and placed on the surface plate are friction stir spots. A spot joining head for joining, a moving means for moving the material to be joined in a predetermined feed direction, and a curved-shaped support portion corresponding to the curved portion of the material to be joined. And a mounting table that guides the material to be joined on both sides of the side, the spot joining head is capable of traversing and tilting in a direction orthogonal to the feeding direction of the material to be joined, and vertically movable. While composed A spot joining system, wherein the portal frame is fixed in place. 6. A spot joining system for spot-joining a plurality of materials to be joined, each of which has a curved surface portion, by superposing the curved surface-shaped supporting portion corresponding to the curved surface portion of the material to be welded. A surface plate on which the bonding material is placed, a gate-shaped frame arranged so as to straddle the surface plate, and a material to be welded mounted on the gate-shaped frame and placed on the surface plate are friction stir spots. A spot joining head for joining, wherein the spot joining head is configured to be traversable and tiltable in a direction orthogonal to the feeding direction of the materials to be joined, and vertically movable A spot joining system, wherein a frame is configured to be movable in a feeding direction of the materials to be joined. 7. A structure manufactured by the spot bonding system according to claim 1. 8. The surface on the side of spot joining is an inner surface,
The structure according to claim 7, wherein a surface on the surface plate is used as an outer surface.