JP2006150387A - Friction stir welding equipment and friction stir welding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide friction stir welding equipment and its method that are capable of effectively preventing deviation from being caused by a revolving tool between adjacent materials to be joined. <P>SOLUTION: The friction stir welding equipment 1 is provided with a bobbin tool 17 which is rotatably inserted into a butted part between a tank body 5 and a mirror plate 7 mutually butted along a joining line 10, and with a driving means 19 which synchronously drives the tank body 5 and the mirror plate 7 so that the bobbin tool 17 is situated on the joining line 10. The driving means 19 is provided with: a first and second rigid bodies 21, 23 which are firmly held in a reinforcing structure provided on the tank body 5 and the mirror plate 7 respectively and which are each extendedly installed in the extending direction of the joining line; and the first and second driving mechanisms 25, 27 which drive the respective rigid bodies in the extending direction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a friction stir welding apparatus and a friction stir welding method.

In the friction stir welding method, as shown in Patent Document 1, a rotary tool made of a material substantially harder than the material of the material to be joined is inserted into the joining portion of the material to be joined, and the rotary tool is moved while rotating. Thus, the joining is performed by generating a plastic flow in the material to be joined by frictional heat generated between the rotary tool and the material to be joined.
For this reason, there is no problem of thermal distortion as compared with welding by melting the workpiece as in arc welding, and there is an advantage that it can be continuously joined along the joining line. Many proposals have been made for application to joining of shaped bodies.

  By the way, in this friction stir welding method, the axial center of the rotary tool is arranged substantially orthogonal to the surface of the material to be joined and is rotated in the surface, so that the force acting on the adjacent material to be joined Is in a direction that is 180 degrees out of phase. For this reason, a force is applied to adjacent members along the joining line, one in the front direction and the other in the rear direction. In this state, the rotary tool moves along the joining line, so that the longitudinal force applied to the adjacent materials to be joined causes front-rear distortion, or the longitudinal deviation occurs along the joining line. There is a risk that a surplus will occur. This is a more serious problem in the case of using a rotating tool called a bobbin tool that rotates with the joint portion sandwiched from both the front and back surfaces.

As countermeasures, those shown in Patent Document 2 and Patent Document 3 have been proposed.
In Patent Document 2, a fixing jig (roller) having a rotation mechanism is disposed on both the front and back surfaces of a material to be bonded and on both the front and rear of the rotary tool. It is intended to fix the material.
In addition, what is shown in Patent Document 3 includes a plurality of restraining means for restraining adjacent materials to be joined at intervals along the joining line, a material for restraining the material to be joined from both front and back surfaces by a friction member, And a rotating body configured to move integrally with the rotary tool, sandwiching the material to be joined, supporting the entire inner peripheral surface of the cylindrical material to be joined by a friction member, and cylindrical What presses with a roller with respect to a to-be-joined material from an inner surface is shown.

Japanese Patent No. 2712838 (FIGS. 1 to 4) JP-A-10-52773 (paragraphs [0021] to [0041] and FIGS. 1 to 8) JP 2004-188488 A (paragraphs [0042] to [0070] and FIGS. 1 to 10)

However, the thing shown by patent document 2 respond | corresponds with the frictional force with respect to the force which is going to shift to the front-back direction which a to-be-joined material acts, and the direction of the front-back direction generate | occur | produced in the adjacent to-be-joined material It was insufficient to prevent the deviation.
Moreover, although what is shown by patent document 2 is substantially fixed to the to-be-joined material by various methods, they are provided at intervals along the joining line, and adjoining to-be-joined materials It is still not enough to prevent the longitudinal displacement that occurs in In addition, since all other means basically correspond to the frictional force, although various improvements have been made, it is still not sufficient to prevent the longitudinal displacement that occurs in the adjacent materials to be joined.

  An object of this invention is to provide the friction stir welding apparatus and friction stir welding method which can prevent effectively the shift | offset | difference which arises between the to-be-joined materials adjacent by a rotary tool in view of the said problem.

In order to solve the above problems, the present invention employs the following means.
That is, the friction stir welding apparatus according to the present invention includes a rotary tool that is rotationally inserted into a butt portion of a material to be joined that is abutted along a joining line, and the material to be joined so that the rotating tool is positioned at the joining line. A friction stir welding apparatus provided with a drive means for driving the joints in synchronism with each other. A rigid body extending in the direction of movement and a drive mechanism for driving the rigid bodies in the direction of extension are provided.

According to the present invention, when the rigid body is moved in the extending direction of the joining line by the drive mechanism, the material to be joined is moved through the reinforcing structure portion, and the butted portion moves in the direction along the joining line. When the rotating tool is inserted into the moving butting portion while rotating, the butting portion of the material to be joined is plastically fluidized by frictional heat generated between the rotating tool and the kneading and kneading. Since the materials to be joined are moved relative to the rotary tool, the plastic-flowed butt portion is moved in the moving direction and loses frictional heat from the rotary tool and is rapidly cooled and hardened. For this reason, the materials to be joined are joined in a state in which the materials are mixed together and completely integrated.
At this time, a force to shift the moving tool back and forth with respect to the moving direction by the rotation of the rotary tool acts on the adjacent materials to be joined, but this force is firmly held by the rigid body, so that the joining position is displaced. Can be prevented. Thereby, the adjoining materials to be joined can be joined together with no excess.
In order to drive the rigid bodies synchronously, for example, appropriate means such as driving the drive mechanism synchronously or connecting the rigid bodies together can be used.

  In the friction stir welding apparatus according to the present invention, the holding of the rigid body by the reinforcing structure portion is performed by penetrating a rod-like member through a hole provided in both the reinforcing structure portion and the rigid body. Features.

As described above, the rigid body is held by the reinforcing structure portion by the rod-shaped member penetrating through the holes provided in the reinforcing structure portion and the rigid body, so that the load transmission between the rigid body and the reinforcing structure portion is the surface pressure. And shearing. For this reason, the material to be joined can be easily restrained and strengthened.
Note that, for example, a hole-pin, a screw-screw hole, or the like is suitable for the connection between the rigid body and the reinforcing structure.

  Moreover, in the friction stir welding apparatus according to the present invention, the reinforcing structure portion is provided in a material to be joined as a function.

Thus, since the reinforcement structure part utilizes what was provided in the to-be-joined material as a function, the rigid body of a drive means can be attached, without changing the structure of a to-be-joined material.
As the structural reinforcing portion, for example, a rib, a flange, a node having an isogrid structure, or the like provided on the material to be joined is used.

  Moreover, in the friction stir welding apparatus according to the present invention, the reinforcing structure portion is provided in the vicinity of the joining line.

  Thus, since the reinforcement structure part is provided in the vicinity of the joining line, the load concerning joining acts only on the butt | matching part vicinity of each to-be-joined material. For this reason, since the special reinforcement is unnecessary for most of the materials to be bonded to which the load applied to the bonding does not act, the weight of the materials to be bonded can be reduced.

  Moreover, the friction stir welding apparatus according to the present invention is characterized in that it includes a restraining means for restraining the butt portion in the thickness direction of the materials to be joined.

As described above, since the constraining means for restraining the butt portion in the thickness direction of the materials to be joined is provided, the joining in the thickness direction of the adjacent materials to be joined, that is, steps can be eliminated.
In addition, as a restraining means, it is provided with the member which each guides a to-be-joined material on both surfaces of the thickness direction in the vicinity of the to-be-joined material of a to-be-joined material, or to-be-joined materials adjoining at intervals along a joining line. Bonding or the like is preferably used.

  Moreover, in the friction stir welding apparatus according to the present invention, the materials to be joined are cylindrical bodies.

Thus, since the materials to be joined are cylindrical bodies, the rigid body is provided so as to surround the materials to be joined. For this reason, the rigid body becomes a cylindrical structure, for example, a ring frame structure, and the strength is increased, so that the weight can be reduced.
In addition, since the material to be bonded mainly consists of rotational motion during bonding, the structure for holding the material to be bonded can be simplified, and the structure of the entire apparatus can be reduced in size and cost.

  In the friction stir welding apparatus according to the present invention, the butt portion of the material to be joined is substantially circular.

  As described above, since the butted portion of the material to be joined is substantially circular, the drive means only needs to drive the material to be joined to rotate about its axis. For this reason, the drive means can be further reduced in size and cost can be reduced.

  In the friction stir welding apparatus according to the present invention, the rigid body is installed outside the material to be joined, which is a cylindrical body.

  Thus, since the rigid body is installed outside the material to be joined that is a cylindrical body, it is easy to approach. For this reason, since it becomes easy to attach the rigid body to the material to be joined, the time for attachment and detachment can be shortened, and the joining work can be shortened.

  In the friction stir welding method according to the present invention, the materials to be joined that have been abutted along the joining line are moved in a direction along the joining line, and a rotating tool is inserted into the moving abutting portion while rotating to cause friction. In the friction stir welding method for performing stir welding, a rigid body that is held by a reinforcing structure provided in the material to be joined and is provided along the extending direction of the joining line is synchronized with the extending direction by a drive mechanism. And moving it.

According to the present invention, when the rigid body is moved by the drive mechanism in synchronization with the extending direction of the joining line, the material to be joined is moved through the reinforcing structure portion, and the butt portion is moved in the direction along the joining line. When the rotating tool is inserted into the moving butting portion while rotating, the butting portion of the material to be joined is plastically fluidized by frictional heat generated between the rotating tool and the kneading and kneading. Since the material to be joined is moved relative to the rotary tool, the plastic-flowed butt portion is moved in the moving direction and loses frictional heat from the rotary tool and is rapidly cooled and solidified. For this reason, the materials to be joined are joined in a state in which the materials are mixed together and completely integrated.
At this time, a force to shift the moving tool back and forth with respect to the moving direction by the rotation of the rotary tool acts on the adjacent materials to be joined, but this force is firmly held by the rigid body, so that the joining position is displaced. Can be prevented. Thereby, the adjoining materials to be joined can be joined together with no excess.

In addition, it is suitable for the reinforcement structure part to utilize what was provided in the to-be-joined material as a function. If it does in this way, a rigid body can be attached, without changing the structure of a to-be-joined material.
Further, it is preferable that the reinforcing structure is provided in the vicinity of the joining line. If it does in this way, the load concerning joining will act only on the butt part vicinity of each joined material. For this reason, since the special reinforcement is unnecessary for most of the materials to be bonded to which the load applied to the bonding does not act, the weight of the materials to be bonded can be reduced.

  In the friction stir welding method according to the present invention, the butt portion is restricted in the thickness direction of the material to be joined by a restraining means.

  As described above, since the butt portion is restrained in the thickness direction of the material to be joined by the restraining means, it is possible to join without any deviation in the thickness direction of adjacent materials to be joined, that is, a step.

  Moreover, in the friction stir welding method according to the present invention, the materials to be joined are cylindrical bodies.

  Thus, since the materials to be joined are cylindrical bodies, the rigid body is provided so as to surround the materials to be joined. For this reason, since the material to be joined mainly has a rotational motion at the time of joining, the structure for holding the material to be joined can be simplified, and the structure of the entire apparatus can be reduced in size and cost.

  In the friction stir welding method according to the present invention, the butted portion of the material to be joined is substantially circular.

  Thus, since the butted portion of the material to be bonded is substantially circular, the drive mechanism only needs to drive the material to be bonded to rotate about its axis. For this reason, since the whole apparatus can be further simplified, further downsizing and cost reduction can be achieved.

  In the friction stir welding method according to the present invention, the rigid body is installed outside the material to be joined, which is a cylindrical body, and is driven from the outside by a drive mechanism.

  Since the rigid body is installed outside the material to be joined which is a cylindrical body, it is easy to approach. For this reason, since it becomes easy to attach the rigid body to the material to be joined, the time for attachment and detachment can be shortened, and the joining work can be shortened.

  According to the friction stir welding apparatus and the friction stir welding method according to the present invention, even if a force to move back and forth with respect to the moving direction acting on the adjacent workpieces is applied by the rotary tool, the joining position is displaced. It can be prevented from occurring. Thereby, the adjoining materials to be joined can be joined together with no excess.

Hereinafter, an embodiment in which the friction stir welding apparatus 1 according to the present invention is applied to the joining of the tank body 5 of the rocket tank 3 (pressure vessel) and the end plates 7 and 8 will be described with reference to FIGS. 1 and 2. explain.
FIG. 1 is a perspective view showing an overall schematic configuration in which a part of the friction stir welding apparatus 1 is omitted. FIG. 2 is a sectional view taken along line XX in FIG.
The tank 3 is a pressure vessel made of an aluminum alloy and formed by joining end plates (joined materials) 7 to both ends of a cylindrical tank body (joined material) 5. A diameter D of the tank body 5 is, for example, 4000 mm. The length of the tank 3 is, for example, 6000 mm.

End plates 7 and 8 have a shape in which cylindrical end portions protrude in a substantially hemispherical shape. The end plate 7 is provided with a manhole 9 at the tip of the hemispherical portion, and a flange (reinforcing structure portion) 11 protruding outward over the entire circumference at the base thick portion. The flange 11 is provided to attach the rocket tank 3 to the installation location.
A substantially circular joining line 10 is formed at the butted portion where the tank body 5 and the end plate 7 are butted.
On the inner peripheral surface of the tank body 5, thick ribs (reinforcing structure portions) 13 that reinforce the tank structure are provided at a distance L from the end portions over the entire circumference. A plurality of screw holes 15 are provided in the rib 13 from the outer peripheral side at intervals in the circumferential direction.
The distance L is, for example, 200 mm, and is 5% of the diameter D of the tank body 5.

The friction stir welding apparatus 1 includes a bobbin tool (rotary tool) 17, a driving device (driving means) 19, and a restraining means 45.
The bobbin tool 17 is made of, for example, tool steel and has a substantially cylindrical shape. A pair of circular shoulder surfaces are provided at the tip of the bobbin tool 17 with the constricted portion interposed therebetween in the axial direction. Each of the bobbin tools 17 has a circular shoulder surface. When the bobbin tool 17 is sandwiched between the front and back surfaces of the workpiece (the tank body 5 and the end plate 7) by a pair of shoulder surfaces, the bobbin tool 17 is rotated about the axis center by a drive mechanism (not shown). The shoulder surface and the constriction are configured to impart frictional heat to the workpiece.

The drive device 19 includes a first rigid body (rigid body) 21 attached to the tank body 5, a second rigid body (rigid body) 23 attached to the end plate 7, and a first drive mechanism (drive mechanism) that drives the first rigid body 21. 25, a second drive mechanism (drive mechanism) 27 for driving the second rigid body 23, and a control means 29 for controlling the drive of the first drive mechanism 25 and the second drive mechanism 27 are provided.
The first rigid body 21 has a ring shape having an inner peripheral diameter larger than the diameter D of the tank body 5, and the cross section thereof is, for example, a rectangle. A tooth shape is formed on the outer periphery of the first rigid body 21.
A plurality of L-shaped attachment members 31 are fixed to the inner circumferential side of the first rigid body 21 at intervals in the circumferential direction. The first rigid body 21 is firmly fixed to the tank body 5 by fixing the mounting member 31 with the bolt 33 that is screwed into the screw hole 15.

The second rigid body 23 has a ring shape having the same outer diameter as that of the first rigid body 21, and the cross section thereof is, for example, a rectangle. On the outer periphery of the second rigid body 23, a tooth pattern having the same pitch as that of the first rigid body 21 is formed.
The second rigid body 23 is firmly fixed to the flange 11 by bolts 35 provided at intervals in the circumferential direction.
The first drive mechanism 25 is provided with a first motor 37 incorporating a speed reduction mechanism, and a first drive gear 39 attached to the output shaft of the first motor 37. The first drive gear 39 is configured to mesh with the tooth profile on the outer periphery of the first rigid body 21 to drive the first rigid body 21 to rotate.

The second drive mechanism 27 is provided with a second motor 41 with a built-in speed reduction mechanism and a second drive gear 43 attached to the output shaft of the second motor 41. The second drive gear 43 is configured to mesh with the tooth profile on the outer periphery of the second rigid body 23 and drive the second rigid body 23 to rotate.
The control means 29 is configured to control the first motor 37 and the second motor 41 to rotate in synchronization.
The control means 29 may detect the rotational positions of the first rigid body 21 and the second rigid body 23 and individually control the driving of the first motor 37 and the second motor 41 so that they match.

The restraining means 45 is provided with an inner clamper 47, a first outer clamper 49, and a second outer clamper 51.
The inner clamper 47 has a ring shape in which both ends of the cylinder protrude outwardly over the entire circumference, that is, the cross section has a U-shape. The outer diameter of the inner clamper 47 is substantially the same as the inner diameter of the cylindrical portion of the tank main body 5 and the end plate 7, and supports the cylindrical portion of the tank main body 5 and the end plate 7 from the inside during the joining operation and restricts its position. is there.
The inner clamp 47 is divided into a plurality of parts.

The first outer clamp 49 has a truncated conical shape and forms a ring shape. The large-diameter portion end of the first clamp 49 is held by a plurality of support columns 53 attached to the side surface of the first rigid body 21 at intervals in the circumferential direction. The diameter of the end of the small diameter portion of the first clamp 49 is substantially the same as the outer diameter of the tank body 5, and regulates the outer position of the tank body 5 during the joining operation.
The second outer clamp 51 has a frustum side shape and forms a ring shape. The large-diameter portion end of the second clamp 51 is held by a plurality of support posts 55 attached to the side surface of the second rigid body 23 at intervals in the circumferential direction. The diameter of the end of the small diameter portion of the second clamp 51 is substantially the same as the outer diameter of the cylindrical portion of the end plate 7, and regulates the outer position of the cylindrical portion of the end plate 7 during the joining operation.

Operation | movement of the friction stir welding apparatus 1 concerning this embodiment demonstrated above is demonstrated including an effect.
First, preparation work for joining work will be described.
The tank body 5 is installed at the work position. Then, the first rigid body 21 is passed through the outside of the tank body 5 and disposed at a predetermined position. The first rigid body 21 is fixed to the tank body 5 by fixing the attachment member 31 to the rib 13 with bolts 33. At the same time, the inner clamp 47 is installed inside the end of the tank body 5.
The bobbin tool 17 is installed at a predetermined position, and the end plate 7 is carried in and installed. Then, the end portion of the tank body 5 and the end portion of the end plate 7 are abutted to form the joining line 10.
Next, the second rigid body 23 is firmly attached to the flange 11 by the bolt 35.
Then, the first drive gear 39 is engaged with the first rigid body 21 and the second drive gear 43 is engaged with the second rigid body 23.

Thus, since the 1st rigid body 21 and the 2nd rigid body 23 are installed in the outer side of the tank main body 5 and the end plate 7 to be joined, an operator can easily approach. For this reason, since the attachment work of the 1st rigid body 21 and the 2nd rigid body 23 becomes easy, attachment time can be shortened. Moreover, the removal time after completion | finish of work can be shortened. Thereby, joining work can be shortened.
In addition, since the first rigid body 21 and the second rigid body 23 are attached using the rib 13 provided to reinforce the strength of the tank body 5 and the flange 11 provided on the end plate 7 for attaching the tank 3. The rigid body can be attached without changing the structure of the tank body 5 and the end plate 7.
Furthermore, since the rib 13 is provided in the vicinity of the joining line 10, the load applied to the joining acts only in the vicinity of the joining line 10 of the tank body 5. For this reason, the load applied to joining does not act on most of the tank body 5. For this reason, special reinforcement is not required for most of the tank body 5, so that the weight of the tank 3 can be reduced.

By installing the first rigid body 21 and the second rigid body 23, the first outer clamp 49 and the second outer clamp 51 are installed at predetermined positions.
The first outer clamp 49 and the second outer clamp 51 regulate the outer position of the tank body 5 and the end plate 7 at positions near both sides of the entire length of the joining line 10, and the inner clamp 47 regulates the inner position of the same part. Will do.

Next, the friction stir welding operation will be described.
The first motor 37 and the second motor 41 are operated, the first drive gear 39 is in the direction of the arrow 59 (clockwise as viewed from the first motor 37 side), and the second drive gear 43 is in the direction of the arrow 61 (second Drive clockwise as viewed from the motor 41 side. Thereby, the 1st rigid body 21 and the 2nd rigid body 23 rotate synchronizing with counterclockwise rotation (movement direction 63) seeing from the end plate 7 side.
The rotation of the first rigid body 21 is transmitted to the tank body 5 via the mounting member 31, the bolt 33 and the rib 13, while the rotation of the second rigid body 23 is transmitted via the bolt 35 and the flange 11. Therefore, the tank body 5 and the end plate 7 rotate integrally in the moving direction 63.
Further, the abutting portion of the tank main body 5 and the end plate 7 is entirely regulated by the inner clamp 47 and the outer position by the first outer clamp 49 and the second outer clamp 51 over the entire circumference. There is no position shift in the thickness direction, that is, no step between the end plate 5 and the end plate 7.

  At substantially the same time, when the bobbin tool 17 is rotated in the direction of the arrow 57, the butted portion of the tank body 5 and the end plate 7 is plastically fluidized by frictional heat generated between the bobbin tool 17 and stirred and kneaded. Since the tank main body 5 and the end plate 7 are moved in the moving direction 63, the plastic-flowed butted portion moves in the moving direction 63. When the plastic-flowed butted portion moves in the moving direction 63, the frictional heat generated by the bobbin tool 17 does not act, so that it rapidly cools and solidifies. In this way, the tank body 5 and the end plate 7 are joined in a state in which the materials are mixed and completely integrated.

Then, the tank body 5 and the end plate 7 are rotated once, whereby the joining of both is completed.
When the joining operation is completed, the bobbin tool 17 is moved to a position that does not affect the removal of the first rigid body 21 and the like. Then, the bolt 35 is removed and the second rigid body 23 is removed. Next, the bolt 33 is removed, and the first rigid body 21 is removed.
Further, the inner clamp 47 is disassembled and carried out from the manhole 9.
And the tank 3 is carried out.

  During the joining operation, the rotation of the bobbin tool 17 causes a force in the direction of the arrow 65 (clockwise when the end plate 7 is viewed from the side) to act on the tank body. A counterclockwise force is applied. These forces (loads) try to shift the positions of the tank body 5 and the end plate 7 in the direction opposite to the moving direction 63. However, since these forces are transmitted to the first rigid body 21 and the second rigid body 23 and are firmly held by them, it is possible to prevent the joining position from being displaced. As a result, the tank body 5 and the end plate 7 can be joined together with little excess.

  In this embodiment, since the tank body 5 and the end plate 7 are cylindrical bodies, and the joining line 10 is substantially circular, the drive device 19 moves the tank body 5 and the end plate 7 around the axis center. Just rotate it. In addition, the position movement of the bobbin tool 17 in the thickness direction may be unnecessary, and the structure for holding the tank body 5 and the end plate 7 and the support structure for the bobbin tool 17 can be simplified. The manufacturing cost can be reduced.

In this embodiment, the bobbin tool 17 that engages both the front and back surfaces is used as the rotary tool. However, the present invention is not limited to this, and a probe-type rotary tool that rubs from one side may be used.
Moreover, in the friction stir welding apparatus 1 of this embodiment, although it applies to joining of the tank main body 5 and the end plate 7 in which the joining line 10 becomes substantially circular shape, it is not limited to this.
For example, the present invention can be applied to the joining of cylindrical bodies, where the joining line is an ellipse, an ellipse, or an arbitrary curved shape. In such a case, the position of a rotary tool such as a bobbin tool may be adjusted in the thickness direction. Further, if the drive device 19 is devised, it can be applied to a rectangular shape.
Furthermore, the joining target of the friction stir welding apparatus according to the present invention is not limited to the cylindrical body as in the present embodiment, and can be applied to joining flat plates, for example.

Moreover, in this embodiment, although the rib 13 or the flange 11 is used as a reinforcement structure part, it is not limited to this.
For example, an isogrid structure 71 shown in FIG. 3 is used where light weight and robustness are required. The isogrid structure 71 forms a lattice-like streak 75 by shaving the inner wall side of the tank wall 73, and the streaks 75 form a continuous structure in which adjacent regular triangles are alternately inverted. A thick node 77 formed where the streaks 75 intersect may be used as the reinforcing structure portion. That is, as shown in FIG. 4, a screw hole 79 that is screwed into the bolt 33 that fixes the attachment member 31 of the first rigid body 21 from the outside of the node 77 may be provided.
Further, as a reinforcing structure portion, what is provided as a function to a material to be joined such as a tank may be added to the material to be joined as a separate member when it is not in an appropriate position.

In the present embodiment, the first rigid body 21 and the rib 13 are coupled to each other by using a bolt 33 and applying a load accompanying the joining to the first rigid body by surface pressure and shear acting between the bolt 33 and the screw hole 15. 21, the tank body 5 can be easily restrained and strengthened.
The connection between the tank body 5 and the first rigid body 21 is not limited to a bolt, but may be a connection by a pin, or any other appropriate connection structure.

  In the present embodiment, the first rigid body 21 and the second rigid body 23 are driven in synchronization with each other, and the first drive mechanism 25 and the second drive mechanism 27 are driven in synchronization. This may be performed, for example, by mechanically coupling the first rigid body 21 and the second rigid body 23 together.

It is a perspective view which shows the friction stir welding apparatus of one Embodiment of this invention. It is XX sectional drawing of FIG. It is a perspective view which shows another embodiment of the reinforcement structure part of this invention. It is YY sectional drawing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Friction stir welding apparatus 5 Tank main body 7 End plate 10 Joining line 13 Rib 17 Bobbin tool 19 Drive device 21 First rigid body 23 Second rigid body 25 First drive mechanism 27 Second drive mechanism 45 Restraining means 77 Node

Claims (13)

A rotary tool that is rotationally inserted into the butted portion of the material to be joined that has been butted along the joining line;
In the friction stir welding apparatus comprising: a driving unit that synchronously drives the materials to be joined so that the rotary tool is positioned on a joining line;
The driving means is held by a reinforcing structure provided in each of the materials to be joined, and each rigid body is provided to extend in the extending direction of the joining line,
A friction stir welding apparatus comprising: a drive mechanism that drives the rigid bodies in the extending direction thereof.   3. The holding of the rigid body by the reinforcing structure portion is performed by penetrating a rod-shaped member through a hole provided in both the reinforcing structure portion and the rigid body. 4. Friction stir welding equipment. The friction stir welding apparatus according to claim 1, wherein the reinforcing structure portion is provided in a material to be joined as a function. The friction stir welding apparatus according to any one of claims 1 to 3, wherein the reinforcing structure portion is provided in the vicinity of the joining line. The friction stir welding apparatus according to any one of claims 1 to 4, further comprising a restraining unit that restrains the butting portion in a thickness direction of the material to be joined. The friction stir welding apparatus according to any one of claims 1 to 5, wherein the materials to be joined are cylindrical bodies. The friction stir welding apparatus according to claim 6, wherein the butted portion of the material to be joined is substantially circular. The friction stir welding apparatus according to claim 5 or 7, wherein the rigid body is installed outside the material to be joined which is a cylindrical body. In the friction stir welding method in which the materials to be joined that are abutted along the joining line are moved in the direction along the joining line, and the friction stir welding is performed by inserting the rotating tool into the moving abutting portion while rotating the rotating tool.
Friction, which is held by a reinforcing structure provided in the material to be joined, and is moved in synchronization with the extending direction by a drive mechanism, with a rigid body provided along the extending direction of the joining line. Stir welding method. The friction stir welding method according to claim 9, wherein the butt portion is restrained in the thickness direction of the material to be joined by restraining means. The friction stir welding method according to claim 9 or 10, wherein the materials to be joined are cylindrical bodies. The friction stir welding method according to claim 11, wherein the butted portion of the material to be joined is substantially circular. The friction stir welding method according to claim 11 or 12, wherein the rigid body is installed outside the material to be joined, which is a cylindrical body, and is driven from the outside by a driving mechanism.

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