JP2001219280A - Method and apparatus for joining cylindrical body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem in which large toughness is required for a backing member, an apparatus required for backing is necessarily made to a large size and a heavy weight to increase an equipment cost, much manpower/time are required for handling a backing device to increase a working cost, such as backing material is not used for a slender cylindrical body. SOLUTION: The welding pressure, which backing 6, 61, 10, 17 receive from a tool 1, is supported with a cylindrical body inner face opposite to assembled parts 3, 72, the tool 1 rotating in a prescribed number of rotations is inserted into the assembled parts 3, 72 supporting the backings 6, 61, 10, 17 and is moved in a prescribed speed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for joining cylindrical bodies such as containers and tubes made of various metals by friction stir welding, and a technique for providing an apparatus therefor.

[0002]

2. Description of the Related Art Heretofore, as a typical means for producing a cylindrical body such as a container or a tube, there has been an extrusion molding method or an arc welding method. However, in the former case, there is a problem in that when manufacturing a cylindrical body having a large diameter, the apparatus becomes large-scale and the cost increases. As for the latter, a plurality of extruded products or a formed product obtained by bending a plate material into a predetermined shape are combined, and the combined portion is formed by MIG welding or TIG.
In this method, the materials to be welded and the welding rod are heated and melted to join, so that thermal distortion is likely to occur and positional accuracy is difficult to obtain. Defects are likely to occur, the surface finish is poor, the stability of the arc, the expensive inert gas is required to prevent the penetration of oxygen such as atmospheric oxygen into the molten metal, and the cost increases. there were.

On the other hand, in recent years, compared to the arc welding,
Attention has been paid to a friction stir welding method capable of joining metal materials with simpler equipment. In the friction stir welding method, as shown in FIG. 15, a tool 1 made of tool steel or the like, which rotates at high speed, is pressed along a combination portion 3 in which edges of a material 2a and a material 2b are joined. It joins by making it enter while. That is, the tool 1 is composed of a cylindrical main body 1a and a friction pin 1c protruding coaxially from the center of the lower surface of the main body 1a. The rotation of the friction pin 1c causes the vicinity of the friction pin 1c. Is heated by frictional heat, and the heat-softened workpiece 2a
2b shows a phenomenon called “plastic flow” in which the metal starts to move while being plastically deformed in accordance with the rotation and the feed of the tool 1. The material to be joined, which has been fluidized in the horizontal and vertical directions by the plastic flow, has a lower surface 1 under the main body 1a.
b, while suppressing the flow in the vertical direction,
When the friction pins 1c pass through and are cooled by the agitation, the materials to be welded are integrated into a joint 19
It becomes firmly joined.

Accordingly, in such a friction stir welding method,
Since the heat input is smaller than that of the arc welding method, the heat distortion is small and the dimensional accuracy is good, and the surface properties of the joining portion 19 are also smooth due to being pressed by the lower surface 1b. As a result, there is no welding bead as in conventional arc welding, and post-processing for the welding bead grinding can be omitted. Further, an expensive inert gas is not required, and the cost can be reduced.

[0005]

In such a friction stir welding method, a large pressing force is applied to the combination portion 3 between the workpieces 2a and 2b from the tool 1 at the time of welding. For this reason, when the material to be joined is a cylindrical body,
A backing is applied to the back surface of the combination portion 3 so that the combination portion and the cylindrical body main body are not deformed by this pressurizing force.

However, if this backing is to be securely held by a supporting member such as an arm inserted into the inside of the cylindrical body from outside, the supporting member needs to have a large rigidity, which is necessary for the backing. Inevitably increase the size and weight of the device. Therefore, not only the equipment cost is increased, but also a lot of labor and time are required for handling the backing device, and the work cost is increased, or such a backing cannot be used with an elongated cylindrical body. was there.

When the end of the tubular body is covered with a lid, it is difficult to use a conventional large supporting member as a backing in terms of working space, and it is difficult to apply the friction stir welding method. Yes, relying on arc welding, etc.
As a result, there is a problem that the sealing performance is deteriorated because the lid plate cannot be fitted with high accuracy due to the thermal strain of the joint, and
In the arc welding method, when performing double-sided welding in order to ensure the reliability of the joint, a higher thermal strain is generated. Therefore, a high-quality joint can be obtained only by a single-side joining operation from the outside. There is a strong demand for the development of a single-sided joining technique for a lid plate using a friction stir welding method.

[0008]

The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described. That is, in claim 1,
A tubular body comprising: a step of abutting a backing on the inside of a combined portion provided by combining materials to be joined in a predetermined shape; and a step of forming the tubular body by friction stir welding the combined portion sequentially from one side outside. In the joining method, the pressurizing force received by the backing from the tool is supported on the cylindrical inner surface on the side opposite to the combination portion, and the tool rotating at a predetermined rotation speed is supported by the backing portion. And moved at a predetermined speed.

According to a second aspect of the present invention, the backing according to the first aspect comprises a die which is rollably or slidably abutted on the combination portion, and a column which is fixed on the upper portion and which can be extended and contracted. And a column base that is slidably or slidably pressed against the inner surface of the cylindrical body at the lower part of the column.

According to a third aspect of the present invention, the backing device according to the second aspect is provided with a constant pressure mechanism for keeping the pressure applied to the inner surface of the cylindrical body constant.

According to a fourth aspect of the present invention, the backing according to the first aspect is a cover-like backing tool that can be inserted into the cylindrical body, and the pressing force is applied to the backing body via a corresponding tool in a direction opposite to the combination part. Is transmitted to the inner surface of the cylindrical body.

According to a fifth aspect of the present invention, the backing according to the first aspect is an annular support which can be inserted into the tubular body, and the pressing force is applied to the combination part by a corresponding tool and a cover plate. Is transmitted to the inner surface of the opposite cylindrical body.

According to a sixth aspect of the present invention, a dummy member capable of preventing the tool from interfering with the patch is interposed between the combination portion according to the fourth and fifth aspects and the patch.

According to a seventh aspect of the present invention, in the backing according to the first aspect, an outer edge portion of a cover plate which can be inserted into the cylindrical body is used, and the pressing force is combined with the combination portion through the cover plate. Is transmitted to the inner surface of the opposite cylindrical body.

According to another aspect of the present invention, the members to be joined having a predetermined shape are combined, and while the backing is kept in contact with and supported by the inside of the combination portion between the members to be joined, friction stir welding is sequentially performed from the outside of one side to form a cylinder. In a cylindrical body joining device for forming a body, a joining device for inserting a tool rotating at a predetermined number of rotations into the combination portion, and a pressing force received from the tool at a cylindrical body surface on a side opposite to the combination portion. It comprises a backing to be supported, and a feeding device capable of moving the backing and the joining device at a predetermined speed with respect to the combination part.

According to a ninth aspect of the present invention, in place of the feeder of the eighth aspect, there is provided a feeder capable of moving the combined portion at a predetermined speed with respect to the backing and joining device.

According to a tenth aspect of the present invention, the backing according to the eighth or ninth aspect is configured such that the backing is slidably or slidably contacted with the combination portion, and the corresponding backing is fixed to an upper portion to expand and contract. A backing device comprising a possible column and a column base which is slidably or slidably pressed against the inner surface of the cylindrical body at a lower portion of the column.

In the eleventh aspect, the backing device according to the tenth aspect is provided with a constant pressure mechanism for keeping the pressure applied to the inner surface of the cylindrical body constant.

According to a twelfth aspect, the backing according to the eighth or ninth aspect is a lid-shaped contact that can be inserted into a cylindrical body, and combines the pressing force through a corresponding member. It is transmitted to the inner surface of the cylindrical body on the opposite side of the part.

According to a thirteenth aspect, the backing according to the eighth or ninth aspect is an annular patch that can be inserted into the cylindrical body, and the pressing force is applied via the corresponding tool and the cover plate. Is transmitted to the inner surface of the cylindrical body on the side opposite to the combination part.

According to a fourteenth aspect, a dummy member capable of preventing the tool from interfering with the patch is interposed between the combination portion according to the twelfth and thirteenth aspects and the patch.

According to a fifteenth aspect, in the backing according to the eighth or ninth aspect, the outer peripheral portion of a lid plate that can be inserted into a cylindrical body is used, and the pressing force is applied through the lid plate. Is transmitted to the inner surface of the cylindrical body on the side opposite to the combination part.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a tubular body joining apparatus according to the present invention, FIG. 2 is a partial cross-sectional side view of the tubular body joining apparatus in a case where materials to be joined are axially joined into a cylindrical tube, and FIG. FIG. 4 is a partial cross-sectional side view of a cylindrical body joining apparatus when a material to be joined is circumferentially joined into a cylindrical tube, FIG. 5 is a front view thereof, and FIG. FIG. 7 is an explanatory view of a cylindrical body joining method in the case of joining, FIG. 7 is a side cross-sectional view of a combination portion when a lid-shaped patch is used, FIG. 8 is an enlarged sectional view of the same, and FIG. FIG. 10 is an enlarged sectional view of the combined part in the case, FIG. 11 is a side sectional view of the combined part when the lid plate is used as a patch, FIG. 12 is an enlarged sectional view of the same, and FIG. FIG. 14 is an explanatory view of a manufacturing process of the container, and FIG. 15 is a view illustrating the principle of the friction stir welding method. It is a diagram.

First, the overall structure of the tubular body joining method according to the present invention will be described with reference to FIGS. According to the joining method of the present invention, a step of contacting a backing inside a combined portion provided by combining materials to be joined having a predetermined shape, and forming the tubular body by sequentially friction stir joining the combined portion from the outside on one side. Process.

In the step of bringing the backing into contact with the inside of the combined portion provided by combining the materials to be joined in a predetermined shape, as shown in FIG. 1, the backing device 6 composed of a plurality of parts is used. After being installed inside the cylindrical workpiece 2,
One end of the backing device 6 is brought into contact with the inside of the combination portion 3. Alternatively, as shown in FIG. 6, instead of the backing device 6, a lid-like patch 10 is fitted from the end of the cylindrical tube 8, and the side plate 10 b of the patch 10 is attached to the end of the cylindrical tube 8 and the lid plate. 9
Can be brought into contact with the entire inner periphery of the combined portion 18 as a backing.

In the step of forming the cylindrical body by sequentially friction stir welding the next combination portion from one side outside, the combination portion 3
The tool 1 is inserted into the workpiece 18 and moved while rotating to join the workpieces 2 by friction stir welding. This is repeated to finish a cylindrical body such as a container or a pipe.

Next, each of these steps will be described in more detail with reference to FIGS. 1, 2, 6, 13, and 15.
First, the step of abutting the backing inside the combination portion provided by combining the materials to be joined in a predetermined shape will be described. As shown in FIGS. 1 and 2, after the backing device 6 composed of a plurality of parts is arranged inside the cylindrical workpiece 2, the entire column 15 is expanded and contracted by a cylinder 14 such as hydraulic or air. As a result, the die 13 disposed at the upper end of the backing device 6 is brought into contact with the inside (the upper side in FIG. 2) of the combination portion 3 where the ends of the workpieces 2 abut against each other, and the column 15 is placed. The placed and fixed column base 16 is brought into contact with the inner surface (the lower side in FIG. 2) of the cylindrical workpiece 2 on the opposite side to the combination part 3, and the tool 1 is moved through the workpiece 2. Is held by the surface plate 11.

As described above, by supporting the pressure applied to the backing from the tool 1 on the cylindrical inner surface opposite to the combination portion 3, the pressure applied to the backing can be effectively processed without difficulty. Therefore, the combination portion 3 can be reliably supported even by the above-described simple device, and the equipment cost and operation cost required for manufacturing the cylindrical body by the friction stir welding method can be greatly reduced. It is.

As shown in FIG. 6, a combination portion 18 is formed by inserting the side plate 9b of the cover plate 9 into the end of the cylindrical tube 8 formed as described above. The pressing force applied to the tool 1 is transmitted to the inner surface of the cylindrical tube 8 on the side opposite to the combination portion 18 through the pressing tool 10 by fitting the contact tool 10 or the like into the backing. It can also be supported by. The method of using this backing tool is such that the backing device cannot be used in a work space, such as when the end is closed with a lid plate, or friction stir welding is performed sporadically for repair welding or the like. This is particularly effective when performing it.

Further, the pressing force applied to the tool 1 may be transmitted from the patch to the bottom plate of the cover plate, and the pressing force may be transmitted to the inner surface of the cylindrical tube 8 on the opposite side of the combination portion 18 via the bottom plate. In this case, it is possible to reduce the weight by making the abutment annular. Also, as shown in FIG.
By providing an annular dummy member 21 between the combination portion 18 and the patch 10, the friction pin 1
c to prevent interference of the material to be joined
The welding between the patch 10 and the combination portion 18 can be prevented, the damage to the patch 10 can be prevented, and the patch 10 can be easily removed after the joining operation. Then, after the patch 10 is removed, the dummy member 21 is removed by grinding using a grinder or the like, so that the notch formed near the joint is removed, and the reliability of the joint can be greatly improved. The material of the dummy member 21 is not particularly limited. However, by using substantially the same material as that of the cylindrical tube 8 and the cover plate 9 constituting the combination portion 18, the occurrence of defects such as the formation of a notch Can be considerably reduced.

Further, when a thick or high-strength material that does not deform under the pressure applied to the tool 1 is used as the cover plate, the outer edge of the cover plate is used as the cover without using the cover. In this case, a jig such as a patch may be omitted to reduce equipment costs.

The shape of the material 2 to be joined used in the present invention may be any shape as long as it can form a cylindrical body such as the above-mentioned container or tube, and may be semicircular, U-shaped, or U-shaped. Extrusion molded products and press molded products having various cross-sectional shapes such as are not particularly limited. Therefore, the cross section of the cylindrical body formed from these materials to be joined can also be formed in various shapes such as a polygon such as a circle, an ellipse, and a square, or a shape obtained by combining them.

It is preferable that the surfaces on which the materials to be joined are combined are smooth in both cases of abutting and overlapping, but in the case of overlapping, they are pressed by the tool 1. Therefore, there may be some unevenness or a curved surface portion on the overlapping surface. Various materials such as an aluminum alloy can be used as the material of the material to be joined, but any material may be used as long as it causes plastic flow by frictional heat, and is not particularly limited.

Next, a description will be given of a process of forming a cylindrical body by friction stir welding the combined portions sequentially from one side outside. As shown in FIG. 15, the tool 1 has a main body 1 made of tool steel.
a, a lower surface 1b, and a friction pin 1c. Then, as shown in FIG.
While rotating at a predetermined rotation speed, for example, 500 to 10000 rpm, the friction pin 1c is pushed in until the lower surface 1b contacts the combination portion 3, and the feeding device 7 moves the friction pin 1c along the combination portion 3 at a predetermined moving speed, for example, 0. .002-3m
It moves in the direction of the arrow at / min.

By the rotation of the tool 1 at this time, the materials 2a and 2b (hereinafter referred to as "materials 2") in the vicinity of the friction pins 1c are heated by frictional heat to generate plastic flow. Since the flow of the bonding material 2 in the surface direction is restricted by the lower surface 1b, the bonding material 2 does not fly outward from the surface,
It is sufficiently stirred and mixed in a fluid state inside the joint 19. As a result, after the friction pins 1c pass through and are cooled, the materials to be joined are integrated and firmly joined.

That is, while the tool 1 is rotated at a predetermined number of revolutions, it is inserted into the combination part 3 which is securely supported by the backing such as the backing device 6 so that the tool 1 can be moved at a predetermined speed. By doing so, it is possible to stably perform friction stir welding to a material to be joined of any shape and material, and as a result, the heat input is small, the dimensional accuracy is good, and the surface property of the joint 19 is That it is smooth by being held down by the lower surface 1b, and further that there is no welding bead such as conventional arc welding, and that post-processing for welding bead grinding can be omitted, thereby reducing work costs; Such excellent characteristics unique to friction stir welding can be sufficiently obtained.

The backing device 6 operates the constant pressure mechanism 20 by hydraulic, pneumatic, or electrical control to maintain the support force of the mold 13 for supporting the combination portion 3 at a constant level. Even if the shape of the material to be welded or the pressing force from the tool 1 slightly fluctuates, the friction stir welding can be stably performed.

Next, the overall structure of a tubular body joining apparatus utilizing the above-described friction stir welding method will be described with reference to FIGS. The tubular body joining apparatus 4 according to the present invention.
As shown in FIG. 1, as shown in FIG. 1, a joining device 5 for inserting a tool 1 rotating at a predetermined rotational speed into a combination portion 3, and a pressing force received from the tool 1 being applied to a cylindrical inner surface on the opposite side to the combination portion 3 And a feeding device 7 that can move the backing device 6 and the joining device 5 at a predetermined speed with respect to the combination portion 3.

Then, instead of the backing device 6, as shown in FIG.
May be provided, and the pressing force may be transmitted to the inner surface of the cylindrical body on the opposite side of the combination unit 18 via the tool 10 or the like.

First, an embodiment of the present invention using the backing device 6 will be described in detail with reference to FIGS. As shown in FIGS. 1 to 3, in the tubular body joining apparatus 4 according to the present invention, a surface plate 11 is laid on the floor, and on the surface plate 11, angular stoppers 12. 12
Are separated from each other, and between the stoppers 12 and 12, the workpiece 2 formed by bending a plate material into a cylindrical shape is placed such that a combination part 3 having curved surface ends butted in the axial direction comes upward. Place and fix.

The backing device 6 is erected inside the cylindrical workpiece 2. The backing device 6 is composed of a mold 13, a column 15, and a column base 16 in this order from above. I have. The column base 16 is rotatably abutted on the inner surface below the material 2 to be joined via the pressure transmitting rollers 30, and the column base 16 and the base 31 of the column base 16 and the upper column 15. Between the telescopic cylinder 14
The pressure chamber 59 in the cylinder 14 is provided inside an accumulator 58 provided adjacent to the column 15.
It is communicated via a pressure reducing valve 57.

The cylinder 14, the pressure reducing valve 57,
The constant pressure mechanism 20 including the accumulator 58 is provided, and the constant pressure mechanism 20 absorbs the impact pressure caused by the pressing force applied to the mold 13 from the tool 1, so that the support force of the combination unit 3 can be kept constant. Even if there is a change in the shape of the material to be welded or a change in the pressing force from the tool 1, stable friction stir welding can be performed. In addition, air other than hydraulic pressure, electric control, or the like can be applied to the constant-pressure mechanism 20, and is not particularly limited.

A height adjusting pipe 32 is connected to the upper end of the cylinder 14 via a lower connecting part 34, and the upper end of the height adjusting pipe 32 is connected to an upper part via an upper connecting part 33. The sliding tube 41 to which the die 13 is fixed is connected, and both the upper connecting portion 33 and the lower connecting portion 34 can be easily removed by bolting or the like. The sliding tube 41 is inserted and supported in a holding hole 29a so as to be slidable in the vertical direction, and the holding hole 29a is
A hole is opened at the tip of a holding arm 29 extending in parallel with the axis. The base of the holding arm 29 is fixed to the side of the moving column 27 of the feeder 7. Further, the die 13 on the upper part of the sliding tube 41 includes a pedestal 35 and a plurality of backing rollers 36 rotatably supported by the pedestal 35. The roller 3 is rotatably abutted on the inside.

In such a configuration, the height adjusting tube 3
2 is replaced with one of various lengths, so that the length from the lower end of the pressure transmitting rollers 30, 30 to the upper end of the die 13;
That is, the entire length of the backing device 6 can be freely changed, and it is possible to cope with the joining of the cylindrical members of the materials 2 having any pipe diameters. Further, by providing the plurality of pressure transmitting rollers 30 and the backing rollers 36 at the upper and lower ends, the backing device 6 can be smoothly moved in the axial direction along the inner surface of the cylindrical workpiece 2. Thus, it is possible to reliably follow the pressing force received from the tool 1 at the time of joining the cylindrical body.

A feeding device 7 is provided on a rail 22 laid toward the surface plate 11 so that the backing device 6 as described above can be held and moved at a predetermined speed. , The self-propelled vehicle 23 on the rail 22 and the self-propelled vehicle 2
The moving column 27 is fixed on the moving column 3, and a head arm 28 having a base fixed to an upper portion of the moving column 27 and supporting the joining device 5 at a front end.

The self-propelled vehicle 23 is disposed on the rail 22 via a driving wheel 24a and a driven wheel 24b which are pivotally supported by the moving table 26, and a driving motor is mounted on the moving table 26. When power of the drive motor 25 is transmitted to the drive wheel 24a via the belt 60, the drive wheel 24a and the driven wheel 24b are rotated,
The self-propelled vehicle 23 can run on the rail 22.

The moving column 27 is erected on the self-propelled vehicle 23, and the holding arm 29 extends from the moving column 27 toward the workpiece 2 as described above. , Holding the backing device 6. on the other hand,
A head arm 28 extends from an upper portion of the moving column 27, and a joining head 37 is fixed to a leading end of the head arm 28 via a posture control adjusting member 38 and the like. The tool 1 is provided. As described above, the tool 1 and the backing device 6 are supported by the same feeding device 7, and the positional relationship between the tool 1 and the backing device 6 can be maintained constant during the operation. Pressing force from the tool 1 at the time of joining the cylindrical body
The backing device 6 can reliably receive and support it.

The joining device 5 including the joining head 37 and the tool 1 is provided with the attitude control adjusting member 38, a drive motor (not shown), and the like. Since the rotation speed and the rotation speed can be freely changed, adjustment to appropriate joining conditions according to the shape and material of the member to be joined 2 can be performed easily and reliably. By arranging the combination part 3 and the die 13 on the pressing direction line of the pressing force applied to the tool 1, the pressing force from the tool 1 at the time of joining the cylindrical body can be more reliably applied by the backing device 6. Can be received.

Next, the cylindrical tube 8 manufactured as described above is used.
Will be described with reference to FIG. As shown in FIGS. 4 and 5,
A surface plate 11 is laid on the floor, and two sets of driven roller portions 42, 42, 43, 43 are disposed on the surface plate 11 in the axial direction so as to be shifted back and forth, and the driven roller portions 42 Two sets of drive roller units 67, 67, 68, 68 which can be driven by a motor or the like are arranged between the driven roller units 43, 43. The cylindrical tube 8a is rotatably bridged on the four rollers 65, 65, 69, 69 between the adjacent driving roller portions 67, 67 and the driven roller portions 42, 42. The cylindrical tube 8b is also rotatably bridged between the four driving rollers 66, 66, 70, 70 between the adjacent driving rollers 68, 68 and the driven rollers 43, 43. The end faces of the cylindrical tube 8b and the cylindrical tube 8a abut each other.

A backing device 61 is erected below the butted combination portion 72, and the backing device 61 is configured by the die 50 and the column 1 in order from the top.
5. It is constituted by a column base 46. Of these, the column base 46 has four pressure transmitting rollers 63, 63, 6
4 and 64, it is brought into contact with the inner surfaces of the cylindrical tubes 8a and 8b on the back side of the rollers 65, 65, 66 and 66, and between the base portion 48 of the column base 16 and the column 15 above. An extendable cylinder 39 is interposed and communicates with the adjacent accumulator 58.

The constant pressure mechanism 20 including the cylinder 39 and the like is provided, and the constant pressure mechanism 20 absorbs the impact pressure caused by the pressing force from the tool 1 as in the case of the cylindrical body joining device 4. The support force of the combination portion 72 can be kept constant, and stable friction stir welding can be performed even if there is a change in the shape of the material to be welded or a change in the pressing force from the tool 1.

A height adjusting tube 32 is connected to the upper end of the cylinder 39 via a lower connecting portion 34, and is connected to the upper end of the height adjusting tube 32 via an upper connecting portion 33. The sliding tube 71 on which the die 50 is fixed is connected, and both the upper connecting portion 33 and the lower connecting portion 34 can be easily removed by bolting or the like. The sliding tube 71 is inserted and held in the holding hole 29a so as to be slidable in the vertical direction.
The holding hole 29a is supported, and is opened at the tip of a holding arm 29 extending in parallel with the axis in the cylindrical tubes 8a and 8b. The base of the holding arm 29 It is fixed to the side of the column 27. Further, the die 50 above the sliding tube 71 includes a pedestal 49 and one backing roller 62 pivotally supported by the pedestal 49,
The backing roller 62 is in rolling contact with the inside of the combination section 72.

Therefore, similarly to the tubular body joining device 4,
The length of the backing device 61 can be freely changed by replacing the height adjusting tube 32 with a tube having various lengths, and the cylindrical members having various tube diameters can be joined to each other. Can be. Further, by providing a plurality of pressure transmitting rollers 63, 63, 64, 64 and a backing roller 62 at the upper and lower ends of the backing device 6, the cylindrical tubes 8a and 8b are rotated in the circumferential direction as described later. Even if the backing device 61 is moved, the backing device 61 can smoothly slide in the circumferential direction along the inner surface of the combination portion 72 where the ends of the cylindrical tubes 8a and 8b of the material to be joined abut with each other. To be able to reliably follow.

The backing device 61 having the above configuration
Is fixed to the side of the feeder 7 via a holding arm 29, while the head arm 28 is
Is extended, and a joining head 37 is fixedly mounted at the tip of the head arm 28 via an attitude control adjusting member 38 and the like.
Further, the tool 1 is provided below the joining head 37. That is, the tool 1 and the backing device 61 are supported by the same feeding device 7, and the feeding device 7 of the tubular body joining device 51 is fixed on the rail 22 using a fixing tool (not shown). I have to.

The joining device 5 is provided with the attitude control adjusting member 38, a drive motor (not shown), and the like so that the angle and rotation speed of the friction pin 1c with respect to the combination portion 72 can be freely changed. Adjustment to appropriate joining conditions according to the shape and material of the joining member 2 can be easily performed. Further, the combination part 72 and the die 50 are arranged on the pressing direction line of the pressing force applied to the tool 1 so that the pressing force from the tool 1 at the time of joining the cylindrical body can be reliably supported by the backing device 61. I have to.

In such a configuration, when the drive roller portions 67 and 68 are driven, the cylindrical tube 8a is rotated by the rollers 65 and the cylindrical tube 8b is simultaneously rotated by the rollers 66 and 66. Therefore, instead of moving the backing device 6 and the joining device 5 with respect to the combination portion 3 as in the tubular body joining device 4, on the contrary, the combination portion 72 is moved to the backing device 61 and the joining device 5. Can be moved at a predetermined speed, and even in the case of joining curved surfaces as in the present embodiment, there is no need to provide a complicated feeding mechanism in the feeding device 7.
Further, since the tool 1 and the backing device 61 are supported by the fixed feeding device 7, the tool 1 and the backing device 6 are supported.
The positional relationship with the tool 1 can be maintained constant during the operation, and the pressing force from the tool 1 at the time of joining the cylindrical body can be reliably received and supported by the backing device 6.

By using the tubular body joining devices 4 and 51 having the backing devices 6 and 61 as described above, even if the equipment is simple and relatively small-scale equipment, it is possible to receive the tools received from the tool 1 during the joining operation. The pressure can be reliably supported, and the equipment cost and operation cost required for manufacturing the cylindrical body by friction stir welding can be significantly reduced.

Next, an embodiment of the present invention using a patch will be described in detail with reference to FIGS. First,
A description will be given of a case where the pressing force is transmitted only by the applicator.
As shown in FIGS. 6 to 8, a cover plate 9 is inserted into an end 8 c of the cylindrical tube 8, and a side plate 9 b of the cover plate 9 and the end 8 c overlap to form a combined portion 18. The side plate 10b of the patch 10 is in contact with the entire inner periphery of the combination portion 18. In this embodiment, the bottom plate 9a of the cover plate 9 is bent to provide a gap 78 between the bottom plate 9a and the side plate 10b of the patch 10.
The pressing force applied to the patch 10 is not applied to the cover plate 9 so that the cover plate 9 is not deformed even when the cover plate 9 is thin or has low strength.

In this manner, the contact tool 10 is connected to the combination section 18.
The cylindrical pipe 8 contacting the entire inner surface is disposed in place of the cylindrical pipe 8b of the cylindrical body joining device 51 shown in FIGS.
When the cylindrical tube 8 is rotated by the drive roller unit 68 while the tool 1 is pressed against the combination unit 18, as in the case where the backing device 61 is used, an additional force received from the tool 1 during the joining operation is obtained. The pressure is applied to the combination part 1 via the patch 10.
The light can be transmitted to the inner surface of the cylindrical tube 8 opposite to the surface 8 and supported by the inner surface. In addition, this patch 10
It is necessary to select a high-strength material that is not easily deformed by the pressing force from the tool 1.

Further, as shown in FIG.
0 is provided with a notch 10c in the side plate 10b.
By externally fitting the annular dummy member 21 to 0c,
Since the interference of the friction pin 1c with the patch 10 and the outflow of the material to be joined to the patch 10 can all be prevented by the dummy member 21, the welding of the patch 10 to the joint portion is prevented. The damage to the tool 10 is minimized, and the patch 10 can be easily removed after the joining operation.

Next, a case will be described in which a pressing tool is used, but the pressing force is transmitted mainly through the cover plate. 9 and 1
As shown in FIG. 0, an annular patch 17 is inserted below the combination portion 18, and further, the cover plate 7
The outside of a shoulder 73b having the outer periphery of 3 bent in a U-shape is in contact with no gap. The bottom plate 73a connected to the shoulder portion 73b is different from the bottom plate 9a of the lid plate 9 in a flat plate shape perpendicular to the side surface of the cylindrical tube 8. In such a configuration, the pressing force applied from the tool 1 to the combination portion 18 is transmitted from the patch 17 via the bottom plate 73 a of the cover plate 73 to the inner surface of the opposite cylindrical tube 8 and supported.

That is, when the cover plate has a certain strength in the vertical direction, like the cover plate 73, by using the bottom plate 73 a of the cover plate 73, the backing plate 17 is used.
Can be made annular to reduce the weight, and the work load and the cost of the jig can be reduced.

Further, it is also possible to use the outer edge of the cover plate as a contact without using the contact, and to transmit the pressing force only via the cover. As shown in FIG. 11 and FIG.
A cover plate 74 having a high strength and a thick outer edge portion 74b is inserted into c, and a bottom plate 74a of the cover plate 74 has a flat plate shape perpendicular to the side surface of the cylindrical tube 8. In such a configuration,
A combination portion 75 is formed from the end portion 8c and the outer edge portion 74b. A pressing force applied from the tool 1 to the combination portion 75 is applied to the opposite cylindrical tube 8 via the bottom plate 74a of the cover plate 74.
It is transmitted to the inner surface and supported.

That is, when the cover plate has a shape or strength such that it is not deformed at all by the pressing force applied to the tool 1 like the cover plate 74, the jig such as a patch is omitted and the jig is applied to the jig. Costs can be reduced. In addition, as shown in FIGS.
In a state where 6.77 is inserted in the outermost part of the cylindrical tube 8, friction stir welding is performed together with the combination portions 18 and 75, so that the appearance and the sealing performance can be improved.

The use of the backing device 10 or 17 or the tubular body joining device 51 using the cover plate 74 usable as the backing device as a backing allows the backing device 6 to be used in a work space. It is possible to quickly cope with a case where it is impossible or a case where friction stir welding is performed spontaneously for repair welding or the like.

Finally, an outline of a procedure for manufacturing a cylindrical closed container using the friction stir method and the apparatus according to the present invention will be described with reference to FIG. First, the upper cover plate 52 and the bottom cover plate 53 are formed by extrusion or press working, and the flat plate is formed into a tubular material 54 by bending or the like.
Process into 55 (S1). Next, the ends 54b and 55b of the side surfaces of the cylindrical workpieces 54 and 55 are abutted to each other, and the obtained combination portion 3 is joined using the tubular body joining device 4 having the backing device 6. Joined, upper cylindrical tube 54
a and the lower cylindrical tube 55a are prepared (S2). Then, using the tubular body joining device 51 having the backing device 61,
The upper lid plate 52 is abutted and joined to one end of the upper cylindrical tube 54a (S3).
The lower cylindrical tube 55a is abutted and joined to the other end of "a" (S4). Finally, the bottom lid plate 53 is joined to the end of the lower cylindrical tube 55a using the patch 10 or the like, thereby manufacturing a cylindrical airtight container 56.

That is, in such a process, by applying the friction stir method and the apparatus according to the present invention, a cylindrical body can be manufactured by friction stir welding with simple and relatively small-scale equipment. Equipment costs and work costs required for manufacturing can be greatly reduced.

[0068]

The present invention is configured as described above.
The following effects are obtained. That is, as in claim 1, a step of abutting a backing on the inside of a combined portion provided by combining materials to be joined in a predetermined shape, and frictionally stir welding the combined portion sequentially from one side to form a cylindrical body. Forming the cylindrical body joining method, the pressing force received by the backing from the tool, while supporting the cylindrical body surface on the opposite side of the combination portion, the tool that rotates at a predetermined number of rotations Since it is inserted into the combination part supported by the backing and is moved at a predetermined speed, the pressing force applied to the backing can be easily and effectively processed, so that the combination part is surely supported by a simple device. This makes it possible to greatly reduce equipment costs and operation costs required for manufacturing a cylindrical body by the friction stir welding method, and furthermore, it is possible to sufficiently cope with the use of an elongated cylindrical body.

According to a second aspect of the present invention, there is provided the backing according to the first aspect, wherein the die is rolled or slidably abutted on the combination portion, and the column is fixed on the upper portion and is extendable. Since the backing device is composed of a column base that is slidably or slidably pressed against the inner surface of the cylindrical body at the bottom of the column, the entire length of the backing device can be freely changed, It is possible to cope with the joining of the cylindrical members of the material to be joined, and furthermore, it is possible to smoothly move the backing device along the inner surface of the material to be joined, and to reliably follow the pressing force received from the tool, The tubular body can be stably bonded.

According to a third aspect of the present invention, the backing device according to the second aspect is provided with a constant pressure mechanism for keeping the pressure applied to the inner surface of the cylindrical body constant. It can be kept constant, and stable friction stir welding can be performed even when the shape of the material to be welded or the pressure applied from the tool fluctuates.

According to a fourth aspect of the present invention, the backing according to the first aspect is a cover-like backing tool that can be inserted into a cylindrical body, and the pressing force is applied to the combination part via a corresponding tool. Since it is transmitted to the inner surface of the cylindrical body on the opposite side, even when the backing device cannot be used in the working space, or when performing friction stir welding for repair jointing, etc., one-side joining can be performed quickly. Can be.

According to a fifth aspect of the present invention, the backing according to the first aspect is an annular support that can be inserted into the cylindrical body, and the combination of the pressing force is applied to the backing through a corresponding tool and a cover plate. Is transmitted to the inner surface of the cylindrical body on the opposite side, so that the weight of the patch can be reduced.

As in claim 6, claim 4 or claim 5
Since a dummy member capable of preventing the tool from interfering with the patch is interposed between the described combination portion and the patch, damage to the patch and welding between the patch and the combination portion can be prevented. In addition, it is possible to easily remove the patch after the joining operation.

According to a seventh aspect of the present invention, in the backing according to the first aspect, an outer edge portion of a cover plate which can be inserted into a cylindrical body is used, and the pressurizing force is combined through the cover plate. When the cover plate is thick or high-strength, a jig such as a backing jig can be omitted to reduce the cost of the jig.

According to the eighth aspect, the members to be joined having a predetermined shape are combined, and while the backing is kept in contact with and supported by the inside of the combination portion between the members to be joined, friction stir welding is sequentially performed from the outer surface on one side to form the cylindrical member. In a cylindrical body joining device for forming a body, a joining device for inserting a tool rotating at a predetermined number of rotations into the combination portion, and a pressing force received from the tool at a cylindrical body surface on a side opposite to the combination portion. Since it is composed of a backing to be supported and a feeder capable of moving the backing and the joining device at a predetermined speed with respect to the combination part, even a simple and relatively small-sized equipment can be used even during the joining operation. Can reliably support the pressing force received from the pressure sensor.

According to a ninth aspect, in place of the feeder according to the eighth aspect, a feeder capable of moving the combined portion at a predetermined speed with respect to the backing and the joining device is provided, so that the curved surface portions are joined. Even in this case, a complicated feed mechanism is not required, and the positional relationship between the tool and the backing device can be kept constant during the work, and the pressing force from the tool during friction stir welding is backed up. Can be received and supported reliably.

According to a tenth aspect, the backing according to the eighth or ninth aspect is characterized in that the backing is slidably or slidably contacted with the combination portion, and the corresponding backing is fixed to an upper portion to expand and contract. Since it is a backing device composed of a possible column and a column base which is slidably or slidably pressed against the inner surface of the cylindrical body at the lower part of the column, friction stir welding between cylindrical tubes having various tube diameters Can be performed, and the pressing force received from the tool can be reliably followed.

In the eleventh aspect, the backing device according to the tenth aspect is provided with a constant pressure mechanism for keeping the pressure applied to the inner surface of the cylindrical body constant. Friction stir welding can be performed.

According to a twelfth aspect, the backing according to the eighth or ninth aspect is a lid-shaped contact that can be inserted into a cylindrical body, and combines the pressing force through a corresponding member. Since it is transmitted to the inner surface of the cylindrical body on the opposite side of the part, even when the backing device cannot be used in the work space, such as when a lid plate is attached to the end of the cylindrical body, it can be quickly used on one side. We can respond by joining.

According to a thirteenth aspect, the backing according to the eighth or ninth aspect is an annular patch that can be inserted into the cylindrical body, and the pressing force is applied via the corresponding tool and the cover plate. Is transmitted to the inner surface of the cylindrical body on the side opposite to the combination part, so that the weight of the patch can be reduced, thereby reducing the work load and the cost of the jig.

According to a fourteenth aspect, a dummy member capable of preventing the tool from interfering with the patch is interposed between the combination portion according to the twelfth and thirteenth aspects and the patch. Can be prevented and can be easily removed.

According to a fifteenth aspect, in the backing according to the eighth or ninth aspect, the outer peripheral portion of a lid plate that can be inserted into a cylindrical body is used, and the pressing force is applied through the lid plate. Is transmitted to the inner surface of the cylindrical body on the side opposite to the combination portion, so that the cost of a jig such as a patch can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of a tubular body joining apparatus according to the present invention.

FIG. 2 is a partial cross-sectional side view of a tubular body joining apparatus in a case where materials to be joined are axially joined to form a cylindrical tube.

FIG. 3 is a front view of the same.

FIG. 4 is a partial cross-sectional side view of a tubular body joining apparatus in a case where materials to be joined are joined in a circumferential direction into a cylindrical tube.

FIG. 5 is a front view of the same.

FIG. 6 is an explanatory view of a cylindrical body joining method when a lid plate is joined to a cylindrical tube.

FIG. 7 is a side cross-sectional view of a combination part when a lid-shaped patch is used.

FIG. 8 is an enlarged sectional view of the same.

FIG. 9 is a side cross-sectional view of a combination portion when an annular patch is used.

FIG. 10 is an enlarged sectional view of the same.

FIG. 11 is a side cross-sectional view of a combination portion when a cover plate is used as a patch.

FIG. 12 is an enlarged sectional view of the same.

FIG. 13 is an enlarged sectional view of a combination part when a dummy member is used.

FIG. 14 is an explanatory diagram of a manufacturing process of the container.

FIG. 15 is an explanatory diagram of the principle of the friction stir welding method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tool 2.52.53.54.55 Material to be joined 3.72 Combined part 4.51 Tubular body joining apparatus 5 Joining apparatus 6.61 Backing apparatus 7 Feeding device 8.54a / 55a Cylindrical body 9.73・ 74 Lid plate 10 ・ 17 Patch 13 ・ 50 Die 15 Column 16 ・ 46 Column base 20 Constant pressure mechanism 21 Dummy member 74b Outer edge

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B23K 101: 04 B23K 101: 04

Claims (15)

[Claims] 1. A step of abutting a backing on the inside of a combination portion provided by combining members to be joined having a predetermined shape, and a step of forming a cylindrical body by friction stir welding the combination portion sequentially from one side outside. In the cylindrical body joining method, the pressing force applied to the backing from the tool is supported on the cylindrical inner surface on the side opposite to the combination portion, and the tool rotating at a predetermined rotation speed is A cylindrical body joining method, wherein the cylindrical body is inserted into the supported combination and moved at a predetermined speed. 2. The mold according to claim 1, wherein the backing is a roll that is slidably or slidably brought into contact with the combination portion, a column that is fixed to the upper portion and that can be extended and contracted, 2. The method for joining tubular bodies according to claim 1, wherein the backing apparatus comprises a column base which is slidably or slidably pressed against the inner surface of the body. 3. The method for joining cylindrical bodies according to claim 2, wherein the backing device is provided with a constant pressure mechanism for keeping a pressure applied to the inner surface of the cylindrical body constant. 4. The backing is a cover-like backing tool that can be inserted into a cylindrical body, and transmits the pressing force to the inner surface of the cylindrical body on the side opposite to the combination part via a corresponding tool. The method for joining cylindrical bodies according to claim 1, wherein: 5. The backing member is a ring-shaped holding member that can be inserted into the cylindrical member, and applies the pressing force to the inner surface of the cylindrical member on the side opposite to the combination portion via a corresponding member and a cover plate. The method for joining cylindrical bodies according to claim 1, wherein the transmission is performed. 6. A cylindrical member according to claim 4, wherein a dummy member capable of preventing the tool from interfering with the patch is interposed between the combination portion and the patch. Body joining method. 7. The backing uses an outer edge portion of a cover plate that can be inserted into a tubular body, and applies the pressing force to the inner surface of the tubular body on the opposite side to the combination portion through the cover plate. The method for joining cylindrical bodies according to claim 1, wherein the transmission is performed. 8. A tubular body is formed by combining frictionally joined materials having a predetermined shape and sequentially performing friction stir welding from one outer side while a backing is kept in contact with and supported on the inside of the combined portion between the materials to be joined. A joining device for inserting a tool rotating at a predetermined number of rotations into the combination portion, and a backing for supporting a pressing force received from the tool on a cylindrical inner surface opposite to the combination portion; And a feeding device capable of moving the backing and the bonding device at a predetermined speed with respect to a combination part. 9. The tubular body joining apparatus according to claim 8, further comprising a feeding device capable of moving the combination portion at a predetermined speed with respect to the backing and joining device, in place of the feeding device. 10. The backing according to claim 1, wherein said backing is a rolling die or slidably abutting on said combination part, a column which is fixed to an upper part thereof and which can be extended and contracted, and a cylindrical part which is formed at a lower part of said column. The cylindrical body joining device according to claim 8 or 9, wherein the device is a backing device including a column base that is slidably or slidably pressed against a body surface. 11. The tubular body joining device according to claim 10, wherein the backing device is provided with a constant pressure mechanism for keeping the pressure applied to the inner surface of the tubular body constant. 12. The backing is a lid-like contact that can be inserted into a cylindrical body, and transmits the pressing force to the inner surface of the cylindrical body on the side opposite to the combination part via a corresponding tool. The cylindrical body joining device according to claim 8 or 9, wherein 13. The backing is an annular backing that can be inserted into the tubular body, and applies the pressing force to the inside of the tubular body on the side opposite to the combination portion via a corresponding tool and a cover plate. The cylindrical body joining device according to claim 8 or 9, wherein the transmission is performed to the cylindrical member. 14. A tubular member according to claim 12, wherein a dummy member capable of preventing interference of the tool with the patch is interposed between the combination portion and the patch. Body joining device. 15. The backing uses an outer edge of a cover plate that can be inserted into a cylindrical body, and applies the pressing force to the inner surface of the cylindrical body on the opposite side to the combination unit through the cover plate. The cylindrical body joining device according to claim 8 or 9, wherein the transmission is performed to the cylindrical member.