JP5612135B2 - Friction stir welding tool, double skin panel assembly manufacturing method, and railcar structure - Google Patents

Description

  The present invention relates to a friction stir welding tool capable of friction stir welding a triangular top portion of a joint portion in a state where the joint portions of the two double skin panels which are abutted are in a triangular shape when viewed from the longitudinal direction. About. Furthermore, the present invention relates to a method for manufacturing a double skin panel assembly using the friction stir welding tool, and a railway vehicle structure.

  In recent years, for example, when producing a double skin panel assembly constituting a railway vehicle structure, friction stir welding has been performed. In this friction stir welding, the shoulder surface of the rotating body is pressed against the periphery of the joined part, a rotating pin-shaped stirring shaft is pushed into the joined part, and the joined part is stirred (plastic flow) with frictional heat. Joining technology. In this friction stir welding, unlike melt welding such as arc welding, since the joining is performed in a solid state, the amount of heat input is small compared to arc welding and the like, and welding distortion can be suppressed.

  A technique for manufacturing a double skin panel joined body by this friction stir welding is described in, for example, Patent Document 1 or Patent Document 2 below. In the following Patent Document 1, as shown in FIG. 14, first, the vertical ribs 524 of the other double skin panel 520 are formed on the inner side of the upper surface plate 511 and the inner surface of the lower surface plate 512 of one double skin panel 510. The protruding pieces 525 are fitted together. Next, the rotating stirring shaft 560 is inserted into the abutted thick-walled joint portion SG, and the joint portion SG is friction stir welded. In this friction stir welding, the longitudinal rib 524 and the protruding piece 525 can withstand a load acting downward from the friction stir welding tool FS2 in the vertical direction (downward in FIG. 14).

  In Patent Document 2 below, as shown in FIG. 15, first, when the two double skin panels 610 and 620 are abutted in the width direction (left and right direction in FIG. 15), end ribs 614 of the double skin panel 610 are used. 15, the projecting portions 611 a and 612 a projecting rightward in FIG. 15 and the projecting portions 621 a and 622 a projecting leftward in FIG. 15 from the end rib 624 of the double skin panel 620 are abutted. Next, the periphery of the joined part SG is sandwiched between the shoulder surface 640a of the upper rotating body 640 and the shoulder surface 650a of the lower rotating body 650, and the joining part SG is friction stir welded by the rotation of the stirring shaft 660. In this friction stir welding, the joint portion 630 of the two double skin panels 610 and 620 has a rectangular shape as shown in FIG. 15 so that the lower rotating body 650 can be disposed below the joining portion SG. .

JP-A-11-90655 JP 2010-64634 A

  By the way, in the friction stir welding described in Patent Document 1, as described above, the vertical rib 524 and the protruding piece 525 are indispensable in order to withstand the load acting downward in the vertical direction from the friction stir welding tool FS2. ing. These vertical ribs 524 and projecting pieces 525 can increase the strength of the joint portion 530, but increase the weight of the double skin panel joined by friction stir welding. Further, during the friction stir welding, the lower part of the joint portion SG may be softened by frictional heat as in the Z portion of FIG. 14 to escape and a lump portion may be generated. This lump portion is also a double skin panel joined body. Cause increase in weight.

  On the other hand, in the friction stir welding described in Patent Document 2, the periphery of the joint portion SG is sandwiched between the shoulder surface 640a of the upper rotating body 640 and the shoulder surface 650a of the lower rotating body 650, and thus the above-described lump portion is generated. There is no fear. However, since the joint portion 630 has a rectangular shape when viewed from the longitudinal direction, there is no portion to be supported below the joint portion SG subjected to friction stir welding, and the strength of the joint portion 630 becomes relatively weak. For this reason, in order to ensure sufficient strength of the joint portion 630, it is necessary to increase the thickness of the protruding portions 611a and 621a to be abutted. However, increasing the thickness increases the weight of the double skin panel assembly. Will do.

  Thus, in the conventional double skin panel assembly, the joint portion has a trapezoidal shape (see FIG. 14) or a rectangular shape (see FIG. 15) having vertical ribs when viewed from the longitudinal direction, and has a strength surface and a weight. It was not an efficient triangle in terms of surface. That is, when viewed from the longitudinal direction, a complete truss structure in which a triangular shape is continuously formed in the width direction including the joint portion is not obtained. In short, a double skin panel assembly (railway vehicle assembly) with a complete truss structure is manufactured by conventional friction stir welding, despite being extremely efficient and superior in terms of strength and weight. Was not.

  Therefore, the present invention has been made to solve the above-described problems, and is a complete truss structure in which a triangular shape is continuously formed in the width direction including the joint portion when viewed from the longitudinal direction. An object of the present invention is to provide a friction stir welding tool capable of producing a double skin panel joined body. Another object of the present invention is to provide a method for manufacturing a double skin panel assembly using the friction stir welding tool. It is another object of the present invention to provide a railway vehicle structure that is very efficient and excellent in terms of strength and weight.

  A friction stir welding tool according to the present invention includes an upper rotating body and a lower rotating body that rotate around an axis and move in a direction orthogonal to the axial direction, and project between the upper rotating body and the lower rotating body. A joint portion of two double skin panels that are abutted in the width direction is joined by frictional heat by rotation of a pin-shaped stirring shaft, and both end portions of the upper rotating body and the lower rotating body facing each other are joined. A slide plate is attached to at least one of the end portions through a thrust bearing, and the slide plate is a triangular apex portion formed by the joint portion when viewed from the longitudinal direction of the double skin panel. It has a curved surface portion that continuously fits in the longitudinal direction with respect to the shape.

  According to the friction stir welding tool according to the present invention, the upper rotary body and the lower rotary body are arranged so as to sandwich the triangular top portion of the joint portion, and the triangular apex portion of the joint portion is formed by the curved surface portion of the slide plate. Press down. At this time, the curved surface portion of the slide plate continuously matches the shape of the apex portion in the longitudinal direction, and the slide plate does not rotate around the axis by the thrust bearing. For this reason, the slide plate keeps pressing the curved surface portion against the apex angle portion without scraping the apex angle portion. As a result, the apex angle portion can be prevented from being softened by frictional heat and escaping to the surroundings, and the apex portion can be friction stir welded by the rotation of the stirring shaft. Thus, even when the joint portion is triangular when viewed from the longitudinal direction, friction stir welding can be performed.

  A method for manufacturing a double skin panel assembly according to the present invention is a manufacturing method for manufacturing a double skin panel assembly by joining two double skin panels, and a plurality of inclined plates connecting an upper surface plate and a lower surface plate. When two double skin panels that are tilted alternately in the width direction are abutted in the width direction, and the joints of the two double skin panels are seen from the longitudinal direction, they abut against the adjacent slope plates. Using the friction stir welding tool according to the present invention described above, the joint portion is formed by the upper rotating body and the lower rotating body by forming the triangular shape by the end portions of the face plates or the end portions of the lower surface plate. Are arranged so as to sandwich the triangular top portion, and the top portion is joined by rotation of the stirring shaft while pressing the triangular apex portion of the joint portion with the curved surface portion of the slide plate. It is characterized in.

  According to the method for manufacturing a double skin panel assembly according to the present invention, the upper rotating body and the lower rotating body are arranged so as to sandwich the triangular top portion of the joint portion, and the curved portion of the slide plate has the triangular shape of the joint portion. Press the apex part of. At this time, the curved surface portion of the slide plate continuously matches the shape of the apex portion in the longitudinal direction, and the slide plate does not rotate around the axis by the thrust bearing. For this reason, the slide plate keeps pressing the curved surface portion against the apex angle portion without scraping the apex angle portion. As a result, the apex angle portion can be prevented from being softened by frictional heat and escaping to the surroundings, and the apex portion can be friction stir welded by the rotation of the stirring shaft. Thus, when viewed from the longitudinal direction, it is possible to manufacture a double skin panel joined body which is a complete truss structure in which a triangular shape is continuously formed in the width direction including the joint portion.

  Further, in the method for manufacturing a double skin panel assembly according to the present invention, the two double skin panels have a truss structure in which the same isosceles triangle shape is continuous in the width direction, and the two double skin panels are butted together. Sometimes, the intersection of the center line of one slope plate and the center line of the other slope plate is located on the outer surface of the top portion of the joint portion or on the inner side of the joint portion, and the joint portion is viewed from the longitudinal direction. It is preferable to form the isosceles triangle when it is formed.

  In this case, in the manufactured double skin panel joined body, since the same isosceles triangle shape including the joint portion continues in the width direction, the strength can be ensured evenly in the width direction. That is, it is not necessary to increase the weight and strength of only the joint portion by providing a member such as a vertical rib. Furthermore, since the intersection of the center line of one slope plate and the center line of the other slope plate is located on the outer surface of the top portion or inside the outer surface, the intersection point is located outside the outer surface of the top portion. Compared with the case where the apex angle part of each isosceles triangle shape is large. Accordingly, the number of slope plates is reduced, and the weight of the double skin panel assembly can be reduced. As a result, it is possible to produce a double skin panel joined body that is most efficient and excellent in both strength and weight with the minimum necessary configuration.

The structure for a railway vehicle according to the present invention is such that adjacent double skin panels are joined, and the adjacent double skin panels have a plurality of slope plates connecting the upper surface plate and the lower surface plate in the width direction. It is a truss structure in which the same isosceles triangle shape is continuously inclined in the width direction, and the two double skin panels jointed in the width direction are viewed from the longitudinal direction. It is formed so as to be in the shape of an isosceles triangle by the end portions of the upper surface plate facing each other and the end portions of the lower surface plate, and in the joint portion, the center line of the one inclined plate and the other The intersection with the center line of the slope plate is located on or outside the outer surface of the top portion, the top portion is joined by friction stir welding, and when viewed from the longitudinal direction, the joint portion is also Including the same in the width direction Wherein the isosceles triangle is continuous.

  According to the railcar structure according to the present invention, since the same isosceles triangle shape including a plurality of joint portions continues in the width direction, the strength can be evenly ensured in the width direction. In other words, unlike conventional railcar structures, vertical ribs for securing strength at a plurality of joint portions are not provided, and only the joint portions are not thick. Therefore, the weight can be significantly reduced as compared with the conventional railway vehicle structure. In addition, since the intersection of the center line of one slope plate and the center line of the other slope plate is located on the outer surface of the top portion or on the inner side of the outer surface, the angle of the vertex portion of each isosceles triangle shape Is relatively large and the number of slope plates is small. In this way, the structure for a railway vehicle is the most efficient and excellent in terms of both strength and weight, with the minimum necessary configuration.

  According to the friction stir welding tool of the present invention and the method for manufacturing a double skin panel assembly, a complete truss structure in which a triangular shape is continuously formed in the width direction including the joint portion when viewed from the longitudinal direction. A double skin panel assembly can be produced. Moreover, according to the railway vehicle structure according to the present invention, the above-described complete truss structure is very efficient and excellent in terms of strength and weight.

It is the perspective view which showed the vehicle body of the railway vehicle. It is the perspective view which showed the state by which the two double skin panels were faced | matched by the width direction. It is the front view which showed the two double skin panels faced | matched in 1st Embodiment. It is the front view which showed the joint part of two double skin panels. It is the front view which showed the friction stir welding tool FS of this embodiment. It is the perspective view which showed the lower slide board of this embodiment. It is the perspective view which showed the lower slide board as a comparative example. It is the figure which showed the state which carries out friction stir welding of the top part of a joint part. It is the figure which showed the state which the intersection of the centerline of one slope board and the centerline of the other slope board is located outside the outer surface of a top part. It is the front view which showed the two double skin panels faced | matched in 2nd Embodiment. It is the front view which showed the two double skin panels faced | matched in 3rd Embodiment. It is the front view which showed the two double skin panels faced | matched in 4th Embodiment. It is the front view which showed the two double skin panels faced | matched in 5th Embodiment. It is the figure which showed the state which carries out friction stir welding of the joint part in which the vertical rib and the protrusion piece were provided conventionally. It is the figure which showed the state which carries out the friction stir welding of the joint part which is a rectangle shape conventionally.

  Embodiments of a friction stir welding tool, a double skin panel assembly, and a railway vehicle assembly according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a vehicle body ST of a railway vehicle. In this vehicle body ST, the side structure 1, the roof structure 2 and the frame 3 are joined in the circumferential direction, and the end structure 4 is joined to the longitudinal ends of the side structure 1, the roof structure 2 and the frame 3. It is constituted by.

  In the side structure 1 and the roof structure 2, a plurality of long double skin panels having a predetermined width are butted in the width direction (circumferential direction). The adjacent double skin panels 10 and 20 are joined by friction stir welding at a distance of 20 to 25 m, which is the length of the vehicle body ST, to form a double skin panel joined body 10A. In the present embodiment, the side structure 1 is a “railway vehicle structure” of the present invention. Here, FIG. 2 is a perspective view showing a state in which the two double skin panels 10 and 20 are abutted in the width direction, and FIG. 3 is a diagram of two double skin panels 10 that are abutted in the first embodiment. , 20 is a front view.

  As shown in FIGS. 2 and 3, the double skin panels 10 and 20 include upper surface plates 11 and 21 and lower surface plates 12 and 22 arranged in parallel, and the upper surface plates 11 and 21 and the lower surface plates 12 and 22, respectively. A plurality of slope plates 13 and 23 to be connected are provided. The double skin panels 10 and 20 are hollow extruded shapes formed by extrusion molding of an aluminum material, and the extrusion direction (direction perpendicular to the paper surface of FIG. 3) is the longitudinal direction, and the extrusion direction and the vertical direction (see FIG. 3 (the upper direction of 3) is the width direction (the left-right direction in FIG. 3).

  The upper surface plates 11 and 21 and the lower surface plates 12 and 22 are not curved and are formed in a planar shape. The slope plates 13 and 23 are disposed so as to continuously incline in the width direction between the upper surface plates 11 and 21 and the lower surface plates 12 and 22, and alternately change the direction in the width direction. Accordingly, as shown in FIG. 3, the double skin panels 10 and 20 have a truss structure in which isosceles triangles are continuous in the width direction. Here, FIG. 4 is a front view showing the joint portion 30 of the two double skin panels 10 and 20.

  As shown in FIG. 4, at the end portion in the width direction of the double skin panel 10 (right end portion in FIG. 4), the end portion 11 a of the upper surface plate 11 hardly protrudes from the upper end of the slope plate 13. The end of the bottom plate 12 protrudes relatively large from the bottom end of the slope plate 13. For this reason, the part which protrudes from the lower end of the slope board 13 among the lower surface boards 12 is called the protrusion part 12a. The end surface of the end portion 11 a of the upper surface plate 11 and the end surface of the protruding portion 12 a of the lower surface plate 12 are planes orthogonal to the plane of the double skin panel 10.

  Similarly, at the end in the width direction of the double skin panel 20 (the left end in FIG. 4), the end 21a of the upper surface plate 21 hardly protrudes from the upper end of the slope plate 23, whereas the lower surface plate 22 The end portion protrudes relatively large from the lower end of the slope plate 23. For this reason, the part which protrudes from the lower end of the slope board 23 among the lower surface boards 22 is called the protrusion part 22a. The end surface of the end portion 21 a of the upper surface plate 21 and the end surface of the protruding portion 22 a of the lower surface plate 22 are planes orthogonal to the plane of the double skin panel 20.

  When such two double skin panels 10 are butted together in the width direction, the end portions 11a and 21a of the upper surface plates 11 and 21 are butted together, and the projecting portions 12a and 22a of the lower surface plates 12 and 22 are butted together. Thus, the joint portion 30 is configured. And when this joint part 30 is seen from a longitudinal direction, it has a triangular shape by protrusion part 12a, 22a which face | matches the adjacent slope plates 13,23. An intersection point P1 between the center line L1 of the slope plate 13 and the center line L2 of the slope plate 23 is located on the outer surface of the top portion 31 of the joint portion 30. In the present embodiment, as will be described later, the end portions 11a and 21a of the upper surface plates 11 and 21, that is, the triangular top portion 31 of the joint portion 30 are friction stir welded and the protruding portions 12a of the lower surface plates 12 and 22 are joined. , 22a are friction stir welded together.

  By the way, in the conventional friction stir welding, the top part 31 of the joint part 30 shown in FIG. 4 was not friction stir welded. This is based on the following reason. First, when a pin-type friction stir welding tool is used, that is, when a rotating body is arranged only on one side (upper side in FIG. 4) with respect to the top portion 31 and friction stir welding is performed, the top portion is removed from the rotating body. A large load is applied to 31 in the downward direction in the vertical direction, and the material of the top portion 31 is softened by frictional heat and escapes downward in FIG. For this reason, in order not to let the material of the top part 31 escape to the lower side of FIG. 4, for example, as shown in FIG.

  On the other hand, when a bobbin tool type friction stir welding tool is used (see FIG. 15), that is, when friction stir welding is performed by sandwiching the upper rotating body and the lower rotating body from both sides with respect to the top portion 31, the lower rotating body is used. Thus, it is possible to support a downward load acting on the top portion 31 in the vertical direction. However, since the lower rotating body is generally cylindrical, the apex angle portion 32 of the joint portion 30 is scraped off by high-speed rotation during friction stir welding. Even if the shape of the lower rotating body is matched with the shape of the apex angle portion 32, the apex angle portion 32 is slightly scraped off by the lower rotating body rotating at a high speed due to distortion of the joint portion 30 or manufacturing errors. As a result, the strength is reduced in the joint portion 30 of the manufactured double skin panel assembly. Thus, with the conventional bobbin tool type friction stir welding tool, the top portion 31 could not be friction stir welded.

  From such a technical background, the joint part joined by the conventional friction stir welding has a trapezoidal shape (see FIG. 14) or a rectangular shape (see FIG. 15) having vertical ribs when viewed from the longitudinal direction. In terms of strength and weight, it is not an efficient triangle. That is, in the conventional double skin panel joined body, when viewed from the longitudinal direction, a complete truss shape in which a triangular shape is continuously formed in the width direction including the joint portion is not formed. Therefore, the present inventors have devised a friction stir welding tool FS that can friction stir weld the top portion 31 of the joint portion 30 without scraping the apex angle portion 32, and a method for manufacturing a double skin panel assembly, as well as strength. In addition, the side structure 1 is devised which is very efficient and excellent in terms of weight.

  FIG. 5 is a front view showing the friction stir welding tool FS of the present embodiment. In FIG. 5, the left half shows a cross section, and the right half shows the appearance. The friction stir welding tool FS is a bobbin tool type tool, and as shown in FIG. 5, the upper rotating body 40 and the lower rotating body 50 rotating around the axis O1, and the upper rotating body 40 and the lower rotating body 50. A pin-like stirring shaft 60 projecting from the upper rotating body 40, an upper slide plate 70 attached to the lower end portion of the upper rotating body 40 via the thrust bearing B 1, and an upper end portion of the lower rotating body 50 via the thrust bearing B 2. And a lower slide plate 80 attached thereto.

  The upper rotator 40 and the lower rotator 50 can be rotated coaxially at high speed by a rotation drive mechanism (not shown). Further, the upper rotating body 40 and the lower rotating body 50 can be adjusted in the vertical position in FIG. 5 by a moving pressing mechanism (not shown) and at the same time, the direction orthogonal to the axis O1 (the direction orthogonal to the plane of FIG. 5), that is, The double skin panel 10 can be moved in the longitudinal direction. The stirring shaft 60 extends coaxially with the upper rotating body 40 and the lower rotating body 50 and is assembled to the upper rotating body 40 and the lower rotating body 50 so as to be integrally rotatable.

  The upper slide plate 70 is prevented from rotating about the axis O1 with respect to the upper rotating body 40 by the thrust bearing B1, and the surfaces of the end portions 11a and 21a of the abutted upper surface plates 11 and 21 are the lower surface 70a. It is what you press. However, the upper slide plate 70 actually receives a resistance force from a material that plastically flows during friction stir welding and rotates slightly around the axis O1. In the upper slide plate 70, the stirring shaft 60 passes through, and the upper side has a truncated cone shape and the lower side has a cylindrical shape. And the lower surface 70a is a plane which opposes the surface of the double skin panels 10 and 20, and is a magnitude | size which functions as a shoulder surface so that the material which plastically flows during friction stir welding may not escape.

  The lower slide plate 80 is prevented from rotating around the axis O1 with respect to the lower rotating body 50 by the thrust bearing B2. Here, FIG. 6 is a perspective view showing the lower slide plate 80. As shown in FIG. 6, in the lower slide plate 80, the stirring shaft 60 penetrates, the lower cross-sectional shape is a substantially trapezoid, the upper cross-sectional shape is a mountain shape, and the length of the double skin panels 10, 20 is A predetermined amount extends in the direction. The lower slide plate 80 has, on the upper side, a curved surface portion 80 a that continuously fits in the longitudinal direction with respect to the shape of the apex angle portion 32 of the joint portion 30. The curved surface portion 80a can continue to press a predetermined range (plastic flow region) in the longitudinal direction of the apex portion 32 without rotating around the axis O1 during the friction stir welding, so that the plastic flowing material does not escape. It functions as a shoulder surface.

  Here, the reason why the curved surface portion 80a is continuously aligned with the shape of the apex angle portion 32 in the longitudinal direction will be described. FIG. 7 is a perspective view showing a lower slide plate 90 having a dome shape as a comparative example. The curved surface portion 90a of the lower slide plate 90 shown in FIG. 7 partially matches with the plane HM indicated by a two-dot chain line with respect to the shape of the apex angle portion 32, but does not continuously match the longitudinal direction. For this reason, if the lower slide plate 90 of the comparative example is used, the curved surface portion 90a cannot continue to press the predetermined range in the longitudinal direction of the apex portion 32 during the friction stir welding, and the plastic flowing material escapes. It will not function as a shoulder surface. Therefore, the “curved surface portion that continuously fits in the longitudinal direction” of the present invention does not include a dome-shaped surface or a conical surface.

  Next, the manufacturing process of the double skin panel assembly 10A of the present embodiment will be described. First, as shown in FIG. 2, the two double skin panels 10 and 20 which comprise the side structure 1 are installed on the mount frame 5, and are faced | matched in the width direction. Thereby, as shown in FIG. 4, the end portions 11 a and 21 a of the upper surface plates 11 and 21 are abutted with each other, and the projecting portions 12 a and 22 a of the lower surface plates 12 and 22 are abutted with each other. At this time, the intersection P1 between the center line L1 of the slope plate 13 and the center line L2 of the slope plate 23 is located on the outer surface of the top portion 31 of the joint portion 30, and the joint portion 30 has an isosceles triangle shape. Formed as follows.

  Subsequently, the top portion 31 of the joint portion 30 is friction stir welded using the friction stir welding tool FS of the present embodiment. Here, FIG. 8 is a view showing a state in which the top portion 31 of the joint portion 30 is friction stir welded. As shown in FIG. 8, the upper rotating body 40 and the lower rotating body 50 are disposed so as to sandwich the top portion 31, and the lower surface 70 a of the upper slide plate 70 is placed between the end portions 11 a and 21 a of the upper surface plates 11 and 21. While pressing against the surface (surface around the top portion 31), the curved surface portion 80 a of the lower slide plate 80 is pressed against the top angle portion 32.

  Then, the upper rotating body 40 and the lower rotating body 50 move in the longitudinal direction while rotating around the axis O1, so that the rotating stirring shaft 60 is inserted into the top portion 31 and along the joint 30X (see FIG. 2). Move. Thereby, the material of the joint part 30X is softened by frictional heat, and turns around in the advancing direction of the stirring shaft 60 while plastically flowing. In the joint portion 30X in which the material is stirred in this way, the material is cured and joined immediately after the stirring shaft 60 passes.

  Here, in the friction stir welding of the present embodiment, the curved surface portion 80a of the lower slide plate 80 is continuously matched with the shape of the apex angle portion 32 of the joint portion 30 in the longitudinal direction, and the lower slide plate 80 is thrust bearing B2. Does not rotate around the axis O1. For this reason, the lower slide plate 80 moves in the longitudinal direction while continuously pressing the curved surface portion 80 a against the apex angle portion 32 without scraping the apex angle portion 32. Thus, the material plastically fluidized by frictional heat can be prevented from escaping from below the top portion 31, and the top portion 31 can be friction stir welded by the rotation of the stirring shaft 60.

  In the friction stir welding of the present embodiment, as described above, the lower slide plate 80 does not rotate around the axis O1 by the thrust bearing B2, and the curved surface portion 80a is pressed against the apex portion 32, and the upper slide plate The thrust bearing B <b> 1 presses the lower surface 70 a against the peripheral surface of the top portion 31 without rotating around the axis O <b> 1 like the upper rotating body 40 by the thrust bearing B <b> 1. Thereby, the frictional heat generated on the peripheral surfaces of the apex angle portion 32 and the apex portion 31 can be suppressed. As a result, it is possible to suppress the occurrence of joint marks on the peripheral surfaces of the apex angle portion 32 and the apex portion 31 and improve the appearance.

  In this manner, after the top portion 31 of the joint portion 30 is friction stir welded, the double skin panels 10 and 20 are inverted upside down and placed on the gantry 5. Thereafter, the projecting portions 12a and 22a of the lower surface plates 12 and 22 that are abutted with each other are subjected to friction stir welding using a conventional bobbin tool type friction stir welding tool. Thereby, the double skin panel joined body 10A to which the double skin panels 10 and 20 are joined can be manufactured, and the side structure 1 can be produced by further friction stir welding the plurality of double skin panel joined bodies 10A. it can.

The effect of 1st Embodiment is demonstrated.
According to the first embodiment, even if the joint portion 30 is triangular when viewed from the longitudinal direction, the lower slide plate 80 does not rotate around the axis O1 by the thrust bearing B2, as described above, and the lower portion Since the curved surface portion 80a of the slide plate 80 can keep pressing the apex angle portion 32 of the joint portion 30, the apex portion 31 can be friction stir welded by rotating the agitation shaft 60 without scraping the apex angle portion 32. As a result, as shown in FIG. 3, a double skin panel joined body 10 </ b> A having a complete truss structure in which a triangular shape is continuously formed in the width direction including the joint portion 30 can be manufactured.

  Further, according to the first embodiment, as shown in FIG. 3, the joint portion 30 has an isosceles triangle shape, and is formed on the double skin panels 10 and 20 and the isosceles triangle shape of the joint portion 30. Each isosceles triangle shape is the same. For this reason, in the double skin panel joined body 10A, since the same isosceles triangle shape including the joint part 30 continues in the width direction, the strength can be ensured evenly in the width direction. That is, it is not necessary to increase the weight and strength of only the joint portion 30 by providing a member such as a vertical rib.

  Further, as shown in FIG. 4, in the joint portion 30, the intersection P <b> 1 between the center line L <b> 1 of the slope plate 13 and the center line L <b> 2 of the slope plate 23 is located on the outer surface of the top portion 31. For this reason, compared with the case where the intersection P1 as shown in FIG. 9 is located outside the outer surface of the apex portion 31, the angle of the apex angle portion of each isosceles triangle is larger. Accordingly, the number of the slope plates 13 and 23 is reduced, and the weight of the double skin panel assembly 10A can be reduced. As a result, the double skin panel assembly 10A is the most efficient and superior in terms of both strength and weight, with the minimum necessary configuration. Furthermore, compared to the case where the intersection point P1 is located outside the outer surface of the top portion 31, the angle of the apex angle portion of each isosceles triangle is larger, so the lower rotating body 50 enters the lower side of the apex portion 32. Can be made easier.

  And according to the side structure 1 of 1st Embodiment, since it was comprised by several double skin panel conjugate | zygote 10A, the effect of 10A of double skin panel conjugate | zygote mentioned above appears notably. That is, in the side structure 1 of this embodiment, since the same isosceles triangle shape including the some joint part 30 continues long in the width direction, intensity | strength can be ensured equally over the width direction. In other words, unlike conventional side structures, vertical ribs for securing strength are not provided at a plurality of joint portions, and only the joint portions are not thick. Therefore, the weight can be significantly reduced as compared with the conventional side structure. Further, as described above, since the angle of the apex portion of each isosceles triangle is large, the number of the slope plates 13 and 23 is reduced. Thus, the side structure 1 of the present embodiment is the most efficient and superior in terms of both strength and weight, with the minimum necessary configuration.

  Next, a second embodiment will be described with reference to FIG. FIG. 10 is a front view of two double skin panels 110 and 120 that are faced to each other in the second embodiment. As shown in FIG. 10, the end surfaces of the end portions 111a and 121a of the upper surface plates 111 and 121 that face each other are a predetermined angle θ (for example, 20 degrees) in the clockwise direction with respect to the plane orthogonal to the plane of the double skin panels 110 and 120. The slope is inclined. Further, the end surfaces of the projecting portions 112a and 122a of the lower surface plates 112 and 122 that face each other are inclined surfaces that are inclined by a predetermined angle (for example, 20 degrees) counterclockwise with respect to the surface orthogonal to the plane of the double skin panels 110 and 120. Yes. Since the other structure of 2nd Embodiment is the same as that of the structure of 1st Embodiment mentioned above, the code | symbol of No. 100 is attached | subjected and the description is abbreviate | omitted.

  According to the second embodiment, as shown in FIG. 10, the two double skin panels 110 and 120 are abutted while being pressed in the direction indicated by the arrow (abutting direction), and friction stir welding is performed. Thereby, even if the protrusions 112a and 122a of the lower surface plates 112 and 122 have relatively low rigidity and are distorted in the thickness direction, friction stir welding can be performed while correcting the distortion by the pressing force. Other functions and effects of the second embodiment are the same as the functions and effects of the first embodiment, and a description thereof will be omitted.

  Next, a third embodiment will be described with reference to FIG. FIG. 11 is a front view showing two double skin panels 210 and 220 which are brought into contact with each other in the third embodiment. As shown in FIG. 11, the configuration of the double skin panels 210 and 220 of the third embodiment is upside down from the configuration of the double skin panels 10 and 20 of the first embodiment, and the friction of the third embodiment. The stir welding tool FS1 is upside down from the configuration of the friction stir welding tool FS of the first embodiment. For this reason, the structure of 3rd Embodiment attaches | subjects the code | symbol of the 200th generation, and abbreviate | omits the description.

  According to the third embodiment, as shown in FIG. 11, the upper slide plate 270 does not rotate around the axis O1 by the thrust bearing B1, and the curved surface portion 270a of the upper slide plate 270 is the apex angle portion 232 of the joint portion 230. Therefore, the top portion 231 can be friction stir welded by rotating the stirring shaft without scraping the top angle portion 232. Since the other effect of 3rd Embodiment is the same as that of 1st Embodiment, the description is abbreviate | omitted.

  Next, a fourth embodiment will be described with reference to FIG. FIG. 12 is a front view showing two double skin panels 310 and 320 that are brought into contact with each other in the fourth embodiment. As shown in FIG. 12, the upper surface plates 311 and 321 and the lower surface plates 312 and 322 of the double skin panels 310 and 320 are slightly curved inward (downward in FIG. 12). Since the other configuration of the fourth embodiment is the same as the configuration of the first embodiment described above, reference numeral 300 is assigned and description thereof is omitted.

  According to the fourth embodiment, it is possible to manufacture the double skin panel joined body 310A (side structure 301) that is slightly curved inward. Since the other effect of 4th Embodiment is the same as that of 1st Embodiment, the description is abbreviate | omitted.

  Next, a fifth embodiment will be described with reference to FIG. FIG. 13 is a front view showing two double skin panels 410 and 420 that are brought into contact with each other in the fifth embodiment. As shown in FIG. 13, the upper surface plates 411 and 421 and the lower surface plates 412 and 422 of the double skin panels 410 and 420 are slightly curved inward (downward in FIG. 13). The end surfaces of the end portions 411a and 421 of the upper surface plates 411 and 421 that face each other are inclined surfaces that are inclined at a predetermined angle θ (for example, 20 degrees) in the clockwise direction with respect to the surface that is orthogonal to the direction in which they face each other. Further, the end surfaces of the projecting portions 412a and 422a of the lower surface plates 412 and 422 that face each other are inclined surfaces that are inclined by a predetermined angle (for example, 20 degrees) in a counterclockwise direction with respect to a surface that is orthogonal to the direction to be abutted. The other configurations of the fifth embodiment are the same as the configurations of the first embodiment described above, and therefore the reference numerals of number 400 are attached and the description thereof is omitted.

  According to the fifth embodiment, as shown in FIG. 13, the two double skin panels 410 and 420 are butted against each other while being pressed in a direction (abutting direction) indicated by an arrow, and friction stir welding is performed. Thereby, even if the protrusions 412a and 422a of the lower surface plates 412 and 422 have relatively low rigidity and are distorted in the thickness direction, friction stir welding can be performed while correcting the distortion by the pressing force. And double skin panel joined body 410A (side structure 401) slightly curved inward can be manufactured. Since the other effect of 5th Embodiment is the same as that of 5th Embodiment, the description is abbreviate | omitted.

As mentioned above, although each embodiment of the friction stir welding tool which concerns on this invention, the manufacturing method of a double skin panel joined body, and the structure for railway vehicles was described, this invention is not limited to this, The range which does not deviate from the meaning Various changes are possible.
For example, in the first embodiment, the friction stir welding tool FS in which the thrust bearing B1 and the upper slide plate 70 are attached to the lower end portion of the upper rotating body 40 is used, but the thrust bearing B1 is used at the lower end portion of the upper rotating body 40. Alternatively, a friction stir welding tool to which the upper slide plate 70 is not attached may be used. That is, it is sufficient that the thrust bearing and the slide plate are attached only to the rotating body facing at least the apex portion 32.

Moreover, in 1st Embodiment, as shown in FIG. 4, although the intersection P1 of the centerline L1 of the slope board 13 and the centerline L2 of the slope board 23 is located on the outer surface of the top part 31, P1 may be located on the inner side (lower side in FIG. 4) of the outer surface of the top portion 31.
Moreover, although each embodiment demonstrated the side structure 1 as an example as a structure for rail vehicles, the structure for rail vehicles is not restricted to a side structure, For example, a roof structure may be sufficient.

DESCRIPTION OF SYMBOLS 1 Side structure 10,20 Double skin panel 10A Double skin panel joined body 11,21 Upper surface board 11,21a End part 12,22 Lower surface board 12a, 22a Protruding part 13,23 Slope board 30 Joint part 31 Top part 32 Vertical part 40 Upper Rotating Body 50 Lower Rotating Body 60 Agitation Shaft 70 Upper Slide Plate 70a Lower Surface 80 Lower Slide Plate 80a Curved Surface B1, B2 Thrust Bearing FS Friction Stir Welding Tool

Claims (4)

An upper rotating body and a lower rotating body that rotate around an axis and move in a direction perpendicular to the axial direction;
Friction stir welding, in which joints of two double skin panels that are butted in the width direction are agitated by frictional heat by the rotation of a pin-shaped stirring shaft protruding between the upper rotating body and the lower rotating body In the tool
A slide plate is attached to at least one of the opposite ends of the upper rotating body and the lower rotating body via a thrust bearing,
The slide plate has a curved surface portion that continuously fits in the longitudinal direction with respect to the shape of the triangular apex portion formed by the joint portion when viewed from the longitudinal direction of the double skin panel. A friction stir welding tool. In the method of manufacturing a double skin panel assembly, in which two double skin panels are bonded to manufacture a double skin panel assembly,
A plurality of slanted plates connecting the top and bottom plates are alternately turned in the width direction, but the two double skin panels are abutted in the width direction, and the joints of the two double skin panels are seen from the longitudinal direction. When viewed, it is formed so as to be triangular by the end portions of the upper surface plate or the end portions of the lower surface plate that face the adjacent slope plate,
The friction stir welding tool according to claim 1, wherein the upper rotary body and the lower rotary body are arranged so as to sandwich a triangular top portion of the joint portion, and the curved surface portion of the slide plate A method for producing a double skin panel joined body, wherein the top part is joined by rotation of the stirring shaft while pressing a triangular apex part of the part. In the manufacturing method of the double skin panel joined body described in claim 2,
The two double skin panels are truss structures in which the same isosceles triangle shape continues in the width direction,
When the two double skin panels are brought into contact with each other, the intersection of the center line of one slope plate and the center line of the other slope plate is located on the outer surface of the top portion of the joint or on the inner side of the outer surface. The method for producing a double skin panel assembly, wherein the joint portion is formed so as to have the isosceles triangle shape when viewed from the longitudinal direction. In the structure for railway vehicles where adjacent double skin panels are joined,
The adjacent double skin panel has a truss structure in which a plurality of inclined plates connecting the upper surface plate and the lower surface plate are alternately inclined in the width direction and the same isosceles triangle shape continues in the width direction. Yes,
When the joint parts of two double skin panels that are butted in the width direction are viewed from the longitudinal direction, the isosceles triangle shape is formed by the ends of the upper surface plates or the end portions of the lower surface plates that face adjacent slope plates. It is formed to become
In the joint portion, the intersection of the center line of one slope plate and the center line of the other slope plate is located on or on the outer surface of the top portion, and the top portion is joined by friction stir welding. And
The structure for a railway vehicle , wherein the same isosceles triangle shape is continuous in the width direction including the joint portion when viewed from the longitudinal direction .

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