JP2004042115A - Double skin panel and friction stir welding method for the double skin panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain the smoothing in friction stir welding and plane welded faces with flat surfaces when double skin panels used for producing a wide panel body are subjected to friction stir welding to each other by using a bobbin tool. <P>SOLUTION: The free ends of panels are composed so that ribs are not present insides. As for the double skin panels 30A and 30B to be welded, in the thickness of face plates 31 and 32 on the sides of the free ends, compared with the thickness of the face plates in hollow parts located on the sides inner than the free ends 33A and 33B via the ribs of the panels, the thickness of the face plates in the other free ends is set so as to be made higher; and the height between the face plates in the double skin panels is set so that the face plates on the sides of the free ends are welded to each other. In the butt or engagement parts, friction stir welding is performed by a bobbin tool 10 with which friction heat is inputted from shoulder faces to both the surface and back faces so that the pressing force against the back face side is higher than that against the surface side. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
INDUSTRIAL APPLICABILITY The present invention relates to a friction stir welding method of a double skin panel used for manufacturing a wide panel body such as a side structure, a floor structure, and a roof structure when manufacturing a large structure such as a vehicle, an aircraft, a building, and the like, and the method is used for the method The present invention relates to a double skin panel (two-sided hollow panel).
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in a railway vehicle structure, a long double-skin panel or a single-skin panel extending in a longitudinal direction of a left and right side structure, a floor structure, a roof structure, and the like of a vehicle is disclosed in Japanese Patent Application Laid-Open No. 2-24663. The side structure, the floor structure, the roof structure, etc. are formed simply by doing so, and a technique is disclosed in which the workability is improved, the occurrence of welding distortion is reduced, and the strain removal and finishing work are reduced.
[0003]
On the other hand, Japanese Patent Application Laid-Open No. Hei 7-505090 discloses a novel joining method of long materials as a solid-state joining method by friction stirring, and such a joining method uses a material substantially harder than a workpiece. By inserting the rotating tool into the joint of the workpiece and moving the rotating tool while rotating, the workpiece is joined by plastic flow due to frictional heat generated between the rotating tool and the workpiece. In such a friction stir welding method, since the joining member can be joined in a solid state while moving the rotating tool while rotating and integrating the softened solid portion, there is no thermal distortion. There is an advantage that even a long material that is substantially infinitely long in the joining direction can be continuously solid-phase joined in the longitudinal direction. Furthermore, since solid-state welding is performed using plastic flow of metal due to frictional heat between the rotary tool and the joining member, joining can be performed without melting the joining portion. Further, since the heating temperature is low, deformation after bonding is small. In addition, there are many advantages, such as fewer defects, because the joints are not melted.
[0004]
Furthermore, using such friction stir welding, a plurality of hollow mold members composed of long double skin panels used for large structures such as railway vehicles are arranged in parallel and butt-joined to form a wide width by friction stir welding. A technique for forming a two-sided structure (panel) is disclosed in Japanese Patent No. 3152420.
[0005]
Next, a rotary tool used for friction stir welding will be described. The friction stir welding includes a probe type rotary tool and a bobbin tool type rotary tool as disclosed in Japanese Patent Application Laid-Open No. 7-505090, and a probe type tool has a shoulder type as shown by reference numeral 20 in FIG. A portion 21 and a probe 22 provided on the shoulder portion 21 are provided, and the shoulder portion 21 has a circular shoulder surface. Then, the rotary tool is rotated from the upper surface of the joining line in a state where a plurality of mold members are abutted or fitted, and the probe 21 is caused to enter a hole (not shown) provided in the joining line of the workpiece. The frictional heat is applied to the workpiece by the circular shoulder surface 21 that slides and rotates on the joining line of the mold material, and the probe 22 is plastically fluidized around the probe 22. In this state, the rotary tool 20 is moved along the joining line. Thereby, the two materials are stirred and kneaded while receiving pressure along the joining line while the periphery of the joining line is plastically fluidized, and moved to the rear side of the probe. As a result, the plastically flowed material loses frictional heat on the rear side and rapidly cools and solidifies, so that both panel plates are joined together in a state where the materials are mixed together and are completely integrated.
[0006]
However, in such a joining method, it is necessary to press the rotating tool against the joining line in order to generate frictional heat at the time of joining. Therefore, a backing metal is used to cope with this reaction force. The backing metal is placed in close contact with the back surface of the face plate of the workpiece, and requires a large pressing force.
[0007]
Therefore, there is a technology in which a support column for supporting the pressing force of the tool is provided at the end of the double skin panel without providing such a backing metal as Japanese Patent No. 3070735.
FIG. 7A shows a joint at the free end of a double skin panel constituting a side structure. The double skin panels 50 and 60 are composed of two face plates 51, 52, 61 and 62 and oblique ribs 53 and 63 connecting them. There are a plurality of slanted ribs 53 and 63, respectively, which are arranged in a truss shape. The inclination directions of the ribs 53 and 63 are alternate.
[0008]
The end of one double skin panel 50 enters the end of the other double skin panel 60. Near the end of the double skin panel 50 is a vertical column 54 that joins the face plate 51 and the face plate 52. Reference numeral 55 denotes a projecting piece that supports an end of the double skin panel 60.
[0009]
The ends of the thick portions (protrusions) 56 and 66 for joining the two double skin panels 50 and 60 are located on an extension of the center of the support 54 in the thickness direction (the horizontal direction in FIG. 7). The face plates 51, 52, 61, and 62 near the joint have a predetermined width on the front side (the outer side in the thickness direction of the double skin panel, the side on which the joining operation is performed, that is, the rotating body side of the rotary tool 20). It protrudes at a predetermined height to form a thick portion.
[0010]
In such a double skin panel, each probe is inserted into the joint on the thick part of the double skin panels 50 and 60 while rotating the two probe-type rotary tools 20. Then, friction stir welding can be performed by horizontally moving the rotary tool 20 along the longitudinal direction of the joint between the two double skin panels 50 and 60.
[0011]
[Problems to be solved by the invention]
In this friction stir welding, the friction stir welding is performed by inserting the probe 21 of the rotary tool 20 into the joining portion of the thick portions 56 and 66. The friction stir welding of the thick portion with the tool shoulder surface is performed. The portion softened by the heat input due to heat enters the bonding gap space 34 and becomes flat, but as shown in FIG. 7B, projections 59 and 69 are present at the corners of the thick portions 56 and 66, After the joining, it is necessary to cut the protrusions 59 and 69, and especially for a long structure such as a vehicle structure, the work is complicated.
Further, it is difficult to predict the cross-sectional area of the gap 34 at the butted portion before the friction stir welding, and it is extremely difficult to determine an appropriate thick portion size in advance.
In the joint method using the probe 11 for the rotary tool 10 as described above, the column 54 as described above is provided because the pressing force of the rotary tool is as large as 6 to 10 KN. It is difficult to set the position of the support and the width of the thick wall, which greatly restricts the design.
[0012]
In order to solve such a drawback, a rotary tool called a bobbin tool 10 has been proposed as shown in FIG.
In such a tool, a pair of shoulders 10A and 10B are provided at regular intervals so as to sandwich both front and back surfaces of a metal plate to be joined, and a probe 11 is provided between the pair of upper and lower shoulders 10A and 10B. Therefore, it is possible to generate frictional heat on both sides of the joint surface, and not only does not cause a joint failure on the back side, but also receives a mutual reaction force between the pair of upper and lower shoulders 10A and 10B. However, if there is a gap between the end surfaces of the butted portions of the two members before joining, a defect such as a dent occurs in the joined portion. For this reason, the strength is reduced, and especially in a large structure such as a vehicle, since the double skin panel becomes long, the management of the gap becomes difficult, the dent becomes large, and defects are easily generated. .
[0013]
SUMMARY OF THE INVENTION In view of the drawbacks of the prior art, the present invention relates to a bobbin tool for double-skin panels used for manufacturing wide panel bodies such as side structures, floor structures, and roof structures when manufacturing large structures such as vehicles, aircraft, and buildings. When performing friction stir welding using a double skin panel, smoothing of the friction stir welding and no unevenness in the surface shape of the joined portion can be obtained, in other words, a flat joint surface with a flat surface can be obtained. And a double-skin panel used for the method.
Another object of the present invention is to provide a friction stir welding method for a double skin panel, which does not require the provision of a thick portion protruding on the panel surface side, and eliminates the need for cutting work for flattening the surface after joining. And a double skin panel used for the same.
[0014]
[Means for Solving the Problems]
The first invention relates to a butt-joining method of a friction stir welding method of a double skin panel used for manufacturing a wide panel body such as a side structure, a floor structure, and a roof structure when manufacturing a large structure such as a vehicle, an aircraft, and a building. In particular, the invention according to claim 1 is applicable to manufacturing wide panels such as side structures, floor structures, and roof structures when manufacturing large structures such as vehicles, aircraft, and buildings. In the friction stir welding method for a double skin panel to be used, the free end of the double skin panel has no ribs therein, and the thickness of the face plate on the free end side is increased from the free end through the ribs of the panel. The thickness of the double skin panel is set to be larger than the thickness of the face plate of the hollow portion located inside the free end, and the free ends of the double skin panel are abutted against each other. The bobbin tool frictional heat from holder surface is heat input, preferably characterized in that friction stir welding with a larger than the surface side heat input the backside heat input is made.
[0015]
According to this invention, a gap (gap) is generated as in the prior art shown in FIG. 7 because the joint structure of the joint portion is abutted, but the plate on the back surface side (hollow portion side) of the free end of the panel. By increasing the thickness, the softened portion on the back side enters the bonding gap space due to heat input due to frictional heat with the shoulder surface at the joint portion, so it is necessary to provide a thick portion on the front surface side as in the conventional technology Therefore, the surface side that can be seen from the outside can be kept flat without forming a concave portion.
As a result, surface processing after joining is basically unnecessary, and the work is particularly simplified for a long object such as a vehicle structure.
[0016]
And in order to achieve such a configuration smoothly, by performing friction stir welding while making the back side heat input larger than the front side heat input, the back side softened earlier than the front side and softened to the gap. It is preferable that the side enters, specifically, means such as making the back side pressing force larger than the front side pressing force, making the rotation speed of the back side shoulder higher than the front side, incorporating a heater in the back side shoulder, etc. Is raised.
[0017]
In order to maintain the flatness of the front side, the thickness Tt of the face plate located on the free end side, the thickness t of the face portion of the hollow portion located inside the free end via the ribs of the panel, and the gap width of the abutting portion are G And if
Tt = t + (1-3) G
It is good to set the thickness so that
Further, it is more preferable that the free end internal space length L parallel to the face plate obtained by abutting the double skin panels with each other is larger than the diameter D of the bobbin tool on the back side. descend. Therefore, the range is preferably 1.1 to 2 times the bobbin tool diameter D.
[0018]
The double skin panel used for friction stir welding by abutting the free ends to each other has a thickness Tt of the face plate located on the free end side of the double skin panel, a thickness t of the face plate located inside the rib of the panel, a gap of the butted portion. When the width is G
The free end internal space length L, which is set so that Tt = t + (1-3) G and is parallel to the face plate obtained by abutting the double skin panels with respect to the bobbin tool diameter D on the back side, is 1. It is configured as a range of 1 to 3 times.
[0019]
A second invention shows a method of manufacturing a wide panel by fitting a free end in a friction stir welding method of a double skin panel. Particularly, the invention according to claim 5, wherein the free end of the double skin panel has And the height between the face plates is set so that the face plates on the free end side are fitted to each other, and the two free ends formed by the fitting are formed. The thickness WTt of the face plates is set in the range of 2t <WTt ≦ 5t with respect to the thickness t of the hollow portion located inside the free end via the rib of the panel, and the free ends of the double skin panel are fitted together. In the fitting portion, friction stir welding is performed by a bobbin tool to which frictional heat is input from the shoulder surfaces on both front and back surfaces.
[0020]
According to this invention, since the joint structure forming the joint is a superposed structure by fitting, no gap (gap) is generated in the joint unlike the related art, and therefore, as shown in FIG. Unlike the prior art, there is little need to provide a thick portion at the joining position to provide extra space for gap entry.
In this case, even in the present invention, the friction stir welding is performed while the heat input amount on the back side is made larger than the heat input amount on the front side by the bobbin tool in which the frictional heat is input from the shoulder surfaces to both the front and back surfaces, thereby further flattening the surface. Is achieved, but not required.
Also in the present invention, the free end internal space length L parallel to the face plate obtained by fitting the double skin panels together is 1.1 to 2 times the bobbin tool diameter D on the back side. Is good.
[0021]
The double skin panel according to the present invention, in which the free ends are fitted together and the fitting portion is friction stir welded, the panel free end is configured to have no ribs therein, The height between the face plates is set so that the face plates on the free end side are fitted to each other, and the thickness WTt between the two free end face plates formed by the fitting is freely set via the ribs of the panel. With respect to the thickness t of the face plate of the hollow portion located inside the end, a range of 2t <WTt ≦ 5t is set,
It is preferable that the free end internal space length L parallel to the face plate obtained by fitting the double skin panels to each other is in a range of 1.1 to 3 times the diameter D of the bobbin tool on the back side.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail using embodiments shown in the drawings. However, unless otherwise specified, the dimensions, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention, but are merely illustrative examples.
[0023]
First, the free end of the double skin panel applied to the first invention and its butting configuration will be described with reference to FIG.
As shown in the figure, the double skin panels 30A and 30B have upper and lower two parallel face plates 31 and 32 and a rib 39 provided between the face plates 31 and 32 in a zigzag triangle shape. On the outside, two free ends 33A, 33B extend horizontally and parallel to the face plates 31, 32 via vertical ribs 38. Both free ends 33A and 33B extend flush with the face plates 31 and 32, and are abutted through a gap 34 so that the surfaces of the face plates 31 and 32 are flush.
As shown in the figure, the free end face is flat by the butting of the free ends 33A and 33B when joining the two double skin panels 30A and 30B. Therefore, when the bobbin tool 10 is used, the double joint to be joined is used. Since the front and back surfaces of the free ends 33A and 33B of the skin panels 30A and 30B can be sandwiched between the pair of upper and lower shoulders 10A and 10B via the probe 11, frictional heat can be generated on both surfaces of the joint surface. Not only does not cause a joint failure on the side, but also has the effect that back reaction metal is not required because the pair of upper and lower shoulders 10A and 10B receive a mutual reaction force, and the back side shoulder 10B of the bobbin tool is not required. Is movable in the longitudinal direction of the skin panel free ends 33A, 33B, and the internal space 37 of the free ends 33A, 33B is provided with ribs 39 therein. 38 is required to be hollow is absent.
In this case, it is necessary that the free space 33L of the free ends 33A, 33B parallel to the face plates 31, 32 obtained by abutting the double skin panels 30A, 30B is larger than the diameter D of the bobbin tool on the back side. However, if it is too large, the strength of that part decreases. Therefore, the range is set to a range of 1.1 to 2 times the diameter D of the bobbin tool.
[0024]
In order to maintain the flatness on the front side, it is necessary that the base material softened on the back side has an extra capacity enough to fill the gap 34, and the free space 33A, 33B has an internal space length L of the bobbin tool diameter D. In the case of twice, the back surface portion corresponding to the diameter D, in other words, about 1/3 of the back surface of the free ends 33A and 33B is softened and enters the gap 34, so that the softened portion has extra free space. The thickness Tt of the face plates 31 and 32 located on the ends 33A and 33B side, the thickness t of the face plates 31 and 32 of the hollow portion located inside the free ends 33A and 33B via the ribs 39 of the panel, and the width of the gap 34 of the butted portion are G. And if
Tt = t + (3) G
It is good to set the thickness so that
When the internal space length L of the free ends 33A, 33B is 1.1 times the diameter D of the bobbin tool, the back surface portion corresponding to the diameter D, in other words, about ／ of the back surface of the free ends 33A, 33B is softened. In order to enter the gap 34, the portion to be softened has excess thickness in the free ends 33A, 33B via the ribs of the face plates 31, 32 located on the free ends 33A, 33B side and the panels 30A, 30B. Assuming that the thickness t of the face plates 31 and 32 of the located hollow portion and the width of the gap 34 of the butted portion are G,
Tt = t + (1.3 ≒ 1) G
It is good to set the thickness so that
[0025]
Furthermore, in this case, preferably, the back side is softened earlier than the front side, so that the flatness on the front side can be maintained, and the back side can be used as a softening excess for entering the gap 34.
Specific means for performing friction stir welding while making the heat input amount on the back side larger than the heat input amount on the front side is to make the back side pressing force larger than the front side pressing force or to reduce the rotation speed of the back side shoulder. Means are required such as making it larger than the front side or incorporating a heater in the back side shoulder.
[0026]
The specific configuration will be described with reference to FIG.
In the figure, reference numeral 10A denotes a surface-side cylindrical shoulder, in which a rotary shaft 29 functioning as the probe 11 extends along the central axis, and a rotary drive unit 17 such as a servomotor is provided at the shaft end.
On the other hand, 10B is a back side shoulder, and the shoulder 10B is formed of a ring-shaped cylinder rotatably fitted to the rotating shaft 29 and a cylindrical rotating cylinder 26 fitted to the rotating shaft 29 outside. And a rotation drive unit 27 such as a servomotor is provided at the shaft end.
Each of the rotary driving units 17 and 27 is connected to a load load body 40 including feed screws 49A and 49B and screw storage units 41A and 41B in which feed screw drive motors 42A and 42B and load cells 44A and 44B are stored. The load body 40 and the rotation driving units 17 and 27 are connected to a control circuit 28, and adjust the rotation phases of the feed screw drive motors 42A and 42B based on the signals of the load cells 44A and 44B of the load body 40, respectively. For example, in a state where the butt joint of the double skin panels 30A, 30B is sandwiched between the shoulder surfaces 10A, 10B on the back side and the front side, the load of the front shoulder 10A on the front side of the joint surface is 10 kgf, The load on the back shoulder surface 10B is controlled to be 200 kgf, and the load on the front shoulder 10A surface is controlled. It is greatly smaller than the load applied to the rear surface side shoulder 10B side.
[0027]
Further, the control circuit 28 is configured to be able to control the number of rotations of the servo motors of the rotation drive units 17 and 27, for example, to control the frictional heat input to the shoulder 10B on the back side and the frictional heat input to the shoulder 10A on the front side. It is controlled by either one of the rotation speed and the pressing load or a combination of both.
[0028]
FIG. 3 shows that the load load body 40 is not a load load body composed of a feed screw, a feed screw drive motor and a load cell storage unit, but the hydraulic cylinders 23A and 23B in which the load cells 24A and 24B are stored and the hydraulic power supply hydraulic sources 25A and 25B. The operation and effect are the same as those in FIG.
[0029]
As shown in FIG. 4, a heater 47 is built in the back side shoulder 10B, and the back side shoulder 10B surface is first brought to the temperature range of 450 ° C. to 560 ° C. which is the temperature range of friction stir welding at the beginning of friction stir welding. Only the back side of the skin panels 30A and 30B may be softened first, and the softened aluminum base material may enter the gap 34 of the butt joint first.
Therefore, the present embodiment requires a heater 47, a temperature sensor 48 for detecting the temperature of the back side shoulder 10B, and a heater control circuit 46 for turning off the heater when the temperature reaches a temperature near the friction stir welding temperature range.
[0030]
Next, the free ends 35 and 36 of the double skin panels 30A and 30B as the second embodiment of the present invention and the fitting structure thereof will be described with reference to FIG.
As shown in the figure, the double skin panels 30A and 30B have upper and lower two parallel face plates 31 and 32 and a rib 39 provided between the face plates 31 and 32 in a zigzag triangle shape. On the outside, two free ends 35 and 36 extend in parallel with the face plates 31 and 32 horizontally through vertical ribs 38. One free end 35 extends flush with the face plates 31 and 32, and the other free end 36 is formed to fit on the inner surface side of the one free end 35, and the two 35 and 36 fit together. It is configured as follows.
Therefore, the double skin panels 30A and 30B in the present embodiment have a configuration in which the panel free ends 35 and 36 have no ribs therein, and the joints between the double skin panel free ends 35 and 36 to be joined to each other. The height between the free ends 35, 36 is set so as to match, and the thickness WTt between the two free ends 35, 36 formed by the fitting is set via the vertical ribs 38, 38 of the panels 30A, 30B. With respect to the thickness t of the hollow face plates 31 and 32 located inside the free ends 35 and 36, the thickness t is set in the range of 2t <WTt ≦ 5t, and the face plate 31, which is obtained by fitting the double skin panels 30A and 30B together, The internal space length L of the free ends 35 and 36 parallel to 32 is preferably in a range of 1.1 to 3 times the diameter D of the bobbin tool (shoulder 10B) on the back side.
[0031]
Further, in this case, the free space 35, 36 parallel to the face plates 31, 32 obtained by fitting the double skin panels 30A, 30B to each other, the range of the internal space length L is 1.1 to 2 with respect to the bobbin tool diameter D. As described above, it is preferable that the gap is set to the double range. Further, in the case of the present embodiment, the gap 34 does not exist, but a slight gap is formed in the fitting surface parallel to the face plates of the free ends 35 and 36. Therefore, in order to maintain the flatness on the surface side of the free ends 35 and 36, it is necessary to have a margin on the back side that enters a slight gap between the fitting surfaces.
Accordingly, the thickness WTt between the two free ends 35 and 36 formed by the fitting is equal to the thickness t of the hollow face plates 31 and 32 located inside the free ends 35 and 36 via the ribs of the panels 30A and 30B. On the other hand, a thickness more than twice (2t <WTt) is required. If the thickness WTt exceeds five times, the friction stir welding using the bobbin tool cannot be effectively performed. Therefore, it is necessary to set WTtmax ≦ 5t.
[0032]
In this case, since the joint structure forming the joint has an overlapping structure by fitting, the gap between the fitting surfaces is extremely small, and a gap 34 is formed in the joint as in the first embodiment. (Gap) does not occur, and therefore flatness can be maintained without providing a thick portion at the joining position and providing extra space for entering the gap 34 as in the first invention. Also, if the friction stir welding is performed by the bobbin tool shown in the embodiment of FIGS. 2 to 4 while the heat input amount on the back side is larger than the heat input amount on the front side in the presence of a small gap between the fitting surfaces, Since the back side softens earlier than the front side, the flatness of the front side can be maintained, and the back side can be used as a softening excess to enter the small gap, further flattening the surface is achieved. You.
[0033]
【The invention's effect】
As described above, according to the present invention, a bobbin tool is used for double skin panels used for manufacturing wide panels such as side structures, floor structures, and roof structures when manufacturing large structures such as vehicles, aircraft, and buildings. When the friction stir welding is performed by using the friction stir welding, smoothness of the friction stir welding and no unevenness in the surface shape of the joined portion can be obtained, in other words, a flat joint surface having a flat surface can be obtained.
Further, according to the present invention, there is no need to provide a thick portion protruding on the panel surface side, and further, after joining, there is no need for a cutting work for flattening the surface.
[Brief description of the drawings]
FIG. 1 is a schematic view illustrating a method of manufacturing a wide panel by abutting free ends of a double skin panel according to a first embodiment of the present invention.
FIG. 2 shows that the back side pressing force is larger than the front side pressing force in order to join the double skin panel of FIG. 1 or 5 using a bobbin tool, or the rotation speed of the back side shoulder is larger than that of the front side. 1 is an overall schematic diagram showing a first example of a friction stir welding apparatus to be used.
FIG. 3 shows that the back side pressing force is larger than the front side pressing force in order to join the double skin panel of FIG. 1 or 5 using a bobbin tool, or the rotation speed of the back side shoulder is larger than that of the front side. FIG. 5 is an overall schematic view showing a second example of the friction stir welding apparatus to be performed.
FIG. 4 is an overall schematic view showing a friction stir welding apparatus having a built-in heater on a back side shoulder for joining the double skin panel of FIG. 1 or 5 using a bobbin tool.
FIG. 5 is a schematic view illustrating a method of manufacturing a wide panel by fitting a free end of a double skin panel according to a second embodiment of the present invention.
FIG. 6 is a basic configuration diagram of a friction stir welding probe tool and a bobbin tool according to a conventional technique.
FIG. 7 is a schematic view showing a method for manufacturing a wide panel by abutting free ends of a double skin panel by friction stir welding according to a conventional technique. (A) shows a state of joining by a hobbin tool, and (B) shows a state after joining.
[Explanation of symbols]
10 bobbin tools
10A Front shoulder
10B back side shoulder
11 Probes
17 Rotation drive
23A, 23B hydraulic cylinder
25A, 25B hydraulic power source
29 Rotation axis
26 cylindrical rotating cylinder
27 Rotation drive
30A, 30B Double skin panel
31, 32 face plate
33A, 33B Free end
34 gap
35, 36 Free end
40 load body
41A, 41B Screw storage section
42A, 42B feed screw drive motor
44A, 44B load cell
46 Heater control circuit
47 heater
48 Temperature sensor
49, 49 Lead screw

Claims (9)

In the friction stir welding method of a double skin panel used for manufacturing a wide panel body when manufacturing a large structure,
The free end of the double skin panel has no ribs therein, and the thickness of the face plate on the free end side is a face plate of a hollow portion located on the inner side of the free end from the free end via the rib of the panel. The thickness is set to be larger than the thickness, and the free ends of the double skin panel are abutted against each other, and at the abutting surface, friction stir welding is performed by a bobbin tool to which frictional heat is input from the shoulder surfaces on both front and back surfaces. Stir welding method for double skin panels. The double-skin panel according to claim 1, wherein the friction stir welding is performed while making the amount of heat input to the back side larger than the amount of heat input to the front side by a bobbin tool into which frictional heat is input from the shoulder surface to both the front and back surfaces. Friction stir welding method. When the thickness Tt of the face plate located on the free end side, the thickness t of the face plate of the hollow portion located inside the free end via the rib of the panel, and the gap width of the butted portion are G,
Tt = t + (1-3) G
The friction stir welding method for a double skin panel according to claim 1 or 2, wherein the thickness is set so as to be as follows. The free end internal space length L parallel to the face plate obtained by abutting the double skin panels is 1.1 to 2 times the bobbin tool diameter D on the back side. 4. The method of friction stir welding of the double skin panel according to 2 or 3. In a double skin panel used for friction stir welding with free ends butted against each other,
When the thickness Tt of the face plate located on the free end side of the double skin panel, the thickness t of the face plate located inside the rib of the panel, and the gap width of the butted portion are G,
The free end internal space length L, which is set so that Tt = t + (1-3) G and is parallel to the face plate obtained by abutting the double skin panels with respect to the bobbin tool diameter D on the back side, is 1. Double skin panel characterized by the range of 1-3 times In the friction stir welding method of a double skin panel used for manufacturing a wide panel body when manufacturing a large structure,
The free end of the double skin panel is configured to have no ribs therein, and the height between the face plates is set so that the face plates on the free end side of the double skin panel to be joined are fitted to each other, The thickness WTt of the two free end face plates formed by the fitting is set in the range of 2t <WTt ≦ 5t with respect to the face plate thickness t of the hollow portion located inside the free end via the rib of the panel. The free ends of the double skin panels are fitted with each other, and at the fitting site, the back side pressing force is made larger than the front side pressing force by a bobbin tool in which frictional heat is input to the front and back sides from the shoulder surfaces. A friction stir welding method for a double skin panel, wherein friction stir welding is performed. 7. The double-skin panel according to claim 6, wherein friction stir welding is performed by a bobbin tool into which frictional heat is input from the shoulder surface to both the front and back surfaces while making the heat input amount on the back side larger than the heat input amount on the front side. Friction stir welding method. The free end internal space length L parallel to the face plate obtained by fitting the double skin panels together is 1.1 to 2 times the diameter D of the bobbin tool on the back side. 8. The method for friction stir welding of a double skin panel according to 6 or 7. In a double skin panel in which free ends are fitted together and the fitting site is friction stir welded,
The free end of the double skin panel is configured to have no ribs therein, and the height between the face plates is set so that the face plates on the free end side of the double skin panel to be joined are fitted to each other. The thickness WTt between the two free end face plates formed by the fitting is set in a range of 2t <WTt ≦ 5t with respect to the face plate thickness t of the hollow portion located inside the free end via the rib of the panel. With
A double skin characterized in that a free end internal space length L parallel to the face plate obtained by fitting the double skin panels together is 1.1 to 3 times the diameter D of the bobbin tool on the back side. panel.

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