JP2006035287A - Hollow extruded shape material and body structure for railway vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lightweight hollow extruded shape material with a structure where the rigidity of a joint is increased, and to provide a body structure for railway vehicle composed of the hollow extruded shape material. <P>SOLUTION: The hollow extruded shape material 1 is composed of a truss structure where a plurality of slant face sheets 13 are overhung between an upper face sheet 11 and a lower face sheet 12, and the cross-section in the width direction is made into a triangle by the upper face sheet 11, the lower face sheet 12 and the slant face sheets 13. Each slant face sheet 13a located at the end in the width direction among the slant face sheets is formed of an inclined part 21 and a bent part 22 bent in the vertical directions. The bent part 22 and the free end part 15 on the elongation of the upper face sheet or lower face sheet projecting in the width direction from the bent part are thickly formed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a hollow extrusion mold material used for a railway vehicle, a building, and the like, and particularly relates to a hollow extrusion mold material that is lightweight and has a structure with increased rigidity of a joint portion, and a railway vehicle structure that includes the hollow extrusion mold material.

  Railcars are demanding high speed and require a lighter body, but they need to be strong enough to withstand the load caused by the pressure difference between the interior and exterior of the vehicle when entering or exiting a tunnel or passing by an oncoming vehicle. And A hollow extrusion mold material obtained by extruding a light alloy material such as aluminum is used for a structure constituting a railway vehicle. The hollow extrusion mold material constituting the railway vehicle structure is a panel that is several hundred mm wide and long in the longitudinal direction of the vehicle body, and they are welded in the width direction to form the structure. Therefore, in order to secure the vehicle body strength of a high-speed railway vehicle composed of a hollow extrusion mold material, it is important to increase the rigidity of the joint portion.

  Here, FIG. 11 is a view showing a joint portion of the hollow extrusion mold material constituting the railway vehicle structure. The hollow extrusion molds 100 and 110 are composed of upper surface plates 101 and 111, lower surface plates 102 and 112, and slope plates 103 and 113 connecting them. There are a plurality of slope plates 103 and 113, respectively, which are arranged in a truss shape. The inclination directions of the slope plates 103 and 113 are alternate. One hollow extrusion mold member 100 is formed with a vertical support plate 104 connecting the upper surface plate 101 and the lower surface plate 102 at the end thereof, and projecting pieces 105 project from the upper and lower positions. The protruding piece 105 is fitted into the end of the other hollow extrusion mold 110, and the support plate 104 supports the end of the hollow extrusion mold 110.

As shown in FIG. 11, the hollow extruded mold members 100 and 110 are formed with thick free end portions 106 and 116, which are abutted on the upper and lower positions of the support plate 104. Then, the friction stir welding is performed by moving the rotary tool 200 along the joining line where the free ends 106 and 116 of the two hollow extrusion mold members 100 and 110 are abutted.
By the way, the hollow extrusion mold materials 100 and 110 are provided with the support plate 104 because the pressing force of the rotary tool 200 is large. However, it is difficult to set the position and the thickness width, and the design is greatly restricted. .

  In order to eliminate such drawbacks, a rotary tool 10 is used in which a material to be joined called a bobbin tool is sandwiched between upper and lower shoulders as shown in FIG. 12 so that friction stir welding can be performed without the support plate 104. . In the hollow extruded mold 130 joined by the rotary tool 300, a slope plate 133 is connected between the parallel upper surface plate 131 and the lower surface plate 132, and side plates 134 are formed at both ends of the upper surface plate 131 and the lower surface plate 132. A free end portion 135 projects from the side plate 134 on the extension of the upper plate 131 and the lower plate 132.

In joining the hollow extruded molds 130, the free end 135 is abutted and sandwiched between the shoulders 310 and 320 of the rotary tool 300 as shown in the figure, and the probe 330 moves along the joining line while rotating. According to the rotary tool 300, the reaction force is received between the pair of upper and lower shoulders 310 and 320, so that the support plate 104 and the backing metal shown in FIG. Then, by friction stir welding performed using the rotary tool 300, the pair of hollow extruded mold members 130 are joined by plastic flow caused by frictional heat at the portion where the free end portions 135 are abutted against each other.
JP 2004-42115 A (page 3, page 5, FIG. 1, FIG. 7)

  By the way, the hollow extrusion mold member 130 shown in FIG. 12 is provided with a side plate 134 at the joint, which is a support for supporting the pressing force when the friction stir welding is performed with the rotary tool 200 shown in FIG. As a function. Therefore, when using the rotary tool 300 that sandwiches the material to be joined between the upper and lower shoulders 310 and 320, the side plate 134 does not function at the time of joining. Further, considering the shearing force acting on the joint portion of the hollow extrusion mold material 130 after joining, the side plate 134 does not function sufficiently to increase the rigidity of the joint portion as will be described later.

Since such a side plate 134 is formed over the entire length of the long hollow extrusion mold member 130 in the longitudinal direction, the weight of the hollow extrusion mold member 130 is increased. Therefore, although the hollow extrusion mold 130 is used for a railway vehicle structure or the like, it has not been preferable in recent years for reducing the weight of the vehicle body accompanying the increase in the speed of the railway vehicle.
Therefore, when the friction stir welding is performed using the rotary tool 300 as shown in FIG. 12, the side plate 134 may be omitted, thereby reducing the weight of the railway vehicle structure. However, even in that case, the rigidity is further lowered, which is not preferable in that respect.

  Therefore, in order to solve such problems, the present invention has an object to provide a hollow extrusion mold material that is lightweight and has a structure in which the rigidity of a joint portion is increased, and a structure for a railway vehicle that includes the hollow extrusion mold material. .

The hollow extrusion mold material of the present invention comprises a truss structure in which a plurality of inclined plates are stretched between an upper surface plate and a lower surface plate, and the cross section in the width direction is triangular by the upper surface plate, the lower surface plate, and the inclined plate. The slope plate located at the end in the width direction of the slope plate is formed of an inclined portion and a bent portion bent in the up-down direction, and the bent upper portion and the bottom plate protruding in the width direction from the bent portion or the lower plate The free end on the extension of the face plate is formed to be thick.
Moreover, the hollow extrusion mold material of the present invention is characterized in that the extension of the center line of the inclined portion intersects the end surface of the free end portion.

Further, in the hollow extrusion mold material of the present invention, the intersection between the center line and the end surface of the free end is 0.3 mm when viewed from the outer surface in the vertical direction of the free end, and the thickness of the free end is 70. Characterized by the percentage position.
Further, in the hollow extrusion mold material of the present invention, the intersection of the center lines of the adjacent slope plates is from 0.3 mm when viewed from the upper side in the vertical direction of the upper surface plate or the lower surface plate, and 70% of the thickness of the free end portion. It is characterized by being located up to the position.

  On the other hand, the railway vehicle structure of the present invention has a hollow truss structure in which a plurality of slope plates are stretched between an upper surface plate and a lower surface plate, and the cross section in the width direction is triangular by the upper surface plate, the lower surface plate, and the slope plate. It is an extrusion mold material, which is formed by abutting the width direction end surfaces of the hollow extrusion mold materials, and joining the butted portions by stirring friction welding, and is located at the end of the hollow extrusion mold material among the inclined plates The slope plate is formed of an inclined portion and a bent portion bent in the vertical direction, and the bent portion and a free end portion on the extension of the upper surface plate or the lower surface plate protruding from the bent portion are formed thick. The distance between the bent portions sandwiching the joint portion is separated by a dimension into which the pin tool of the rotary tool enters.

The railcar structure according to the present invention is characterized in that the extension of the center line of the inclined portion intersects the joining end surface against which the free end portion is abutted.
Further, in the railcar structure of the present invention, the intersection of the center line and the joining end surface against which the free end is abutted is 0.3 mm when viewed from the outer side in the vertical direction of the free end. It is characterized by being up to a position of 70% of the thickness of the part.
In the railcar structure of the present invention, the intersection of the center lines of the adjacent slope plates is from 0.3 mm when viewed from the upper and lower outer surfaces of the upper surface plate or the lower surface plate, and the thickness of the free end is 70. Characterized by the percentage position.

Therefore, in the hollow extrusion mold material of the present invention, it is possible to reduce the weight because it is a structure that does not have a support plate that supports the load applied during friction stir welding, and the slope plate is formed from an inclined portion and a bent portion, Since the virtual truss can be constructed by increasing the rigidity by thickening the free end and the bent part, the joint made by abutting the hollow extrusion mold material and friction stir welded can be made rigid by making the structure stable externally. It becomes possible to increase.
Further, the structure for a railway vehicle of the present invention formed from such a hollow extruded mold material was able to reduce the weight and increase the rigidity.

Further, in the railway vehicle structure of the present invention formed by joining hollow extrusion mold materials, the distance between the bent portions sandwiching the joint portion is wide, and the pin tool of the rotary tool is inserted during the friction stir welding. It is not scraped off to reduce the strength.
Further, in the hollow extrusion mold material of the present invention and the railway vehicle structure formed thereby, the intersection of the center lines of the slope plates is 70% of the plate thickness of the top plate or the bottom plate from a distance of 0.3 mm from the surface. Therefore, the intersection point can be brought close to the upper surface plate or the lower surface plate, or the thickness center of the free end, and the rigidity against shear deformation can be improved.

Next, an embodiment of a hollow extrusion mold material according to the present invention will be described below with reference to the drawings. FIG. 1 is a view showing a joint portion of the hollow extrusion mold material of the present embodiment.
This hollow extruded mold 1 is a truss-like structure in which a plurality of inclined plates 13 are alternately stretched between two parallel upper surface plates 11 and lower surface plates 12 in the same manner as in the prior art. Panel. In the present embodiment, thick free ends 15 and 15 are formed on the extension of the upper surface plate 11 at both ends in the horizontal direction of the drawing.

  The hollow extruded mold 1 of this embodiment is a panel that is several hundred mm wide and long in the longitudinal direction of the vehicle body so as to constitute a railway vehicle structure, and is welded and joined in the width direction on the left and right sides of the drawing. Here, FIG. 9 is an external view showing a structure for a railway vehicle composed of a hollow extrusion mold material. The railcar structure 80 includes a side structure 81 that forms left and right surfaces with respect to the longitudinal direction, a wife structure 82 that forms surfaces that close both ends with respect to the longitudinal direction of the vehicle body, and a roof structure 83 that forms a roof. , And a frame 84 that forms the floor surface. Among them, the side structure 81 and the roof structure 83 are formed by welding the long hollow extruded mold 1 formed with a predetermined width in the width direction.

When joining the hollow extruded molds 1 to each other, a pair of hollow extruded molds 1 are arranged side by side, and as shown in FIG. Each other is abutted. And each butted part T1, T2 of the free end part 15 and the lower surface board 12 is joined by friction stirring. Here, FIG. 2 is a diagram showing a state at the time of joining.
For the friction stir welding, the same rotary tool 50 as that shown in FIG. 12 is used. The rotary tool 50 is provided with pin tools 51 and 52 for sandwiching the free end portion 15 and the bottom plate 12 of the upper surface plate 11 which is a material to be joined from above and below, and an agitating pin 53 that rotates and moves the joint portion. , 52 and the same axis. The integrally formed pin tools 51 and 52 and the stirring pin 53 are rotated by a motor (not shown).

  Therefore, when the hollow extruded molds 1 abutted in the width direction are joined to each other with the rotary tool 50, the free end 15 of the abutted upper surface plate 11 or the joined portion of the lower surface plate 12 is respectively pin tools 51, 52. The agitating pin 53 is pressed against the abutting portions T1 and T2 (see FIG. 1), and the rotary tool 50 is moved along the longitudinal direction (direction passing through the drawing) as it is. At this time, the free end portion 15 of the upper surface plate 11 and the abutting portions T1 and T2 of the lower surface plate 12 are heated and softened, causing plastic flow and solid phase bonding. The hollow extruded mold 1 is subjected to friction stir welding at the abutting portions T1 and T2 in the width direction along the joining line in the longitudinal direction.

  Since the hollow extrusion mold material 1 of the present embodiment uses the rotary tool 50 that sandwiches the material to be joined by the pin tools 51 and 52 as described above, the pressing force unlike the rotary tool 200 shown in FIG. Therefore, unlike the hollow extrusion mold materials 100, 110, and 130 shown in FIGS. 11 and 12, a support plate perpendicular to the end portion is not provided. The hollow extruded mold 1 is composed of a truss in which a plurality of inclined plates 13 are alternately stretched between two parallel upper and lower plate 11 and 12 as described above. Thus, the rigidity against the shearing force is increased. Therefore, the structure for a railway vehicle configured by joining the hollow extruded molds 1 to each other is configured such that the cross-sections of the side structure 81 and the roof structure 83 all form a triangular truss.

However, when the truss is to be configured by the inclined plate 13 also at the joint, it is necessary to secure a space for the pin tool 51 of the rotary tool 50 to enter the joint. Otherwise, the pin tool 51 scrapes off the joint and causes a decrease in strength.
For example, FIG. 10 shows a joint portion of a hollow extrusion mold 150 having a configuration similar to the hollow extrusion mold of the present embodiment. This hollow extruded mold 150 is also joined by the rotary tool 50 that sandwiches the materials to be joined by the pin tools 51 and 52.

  Therefore, when looking at the slope plate 153 constituting the truss, the intersection point p1 of the reference line L passing through the approximate center of the thickness of the slope plates 153a and 153b or between the slope plates 153b is the upper surface plate 151 or the lower surface plate 152. Located in. On the other hand, in the end slope plates 153 a located at the joint, the intersection point p <b> 2 of the reference line L is located outside the lower surface plate 152. That is, the cross-sectional shape surrounded by the slope plate 153a, the upper surface plate 151, and the lower surface plate 152 formed at the joint is not a triangle but a trapezoid. However, when the cross-sectional shape is trapezoidal, it is unstable with respect to the shearing force acting on the upper surface plate 151 and the lower surface plate 152 and has low rigidity. The same applies to the hollow extruded mold 130 having the side plate 134 shown in FIG.

  On the other hand, in the case of the one shown in FIG. 10, if the angle of the inclined plate 153a is changed so that the intersection point p2 enters the hollow extruded mold 150 or comes closer, the space where the pin tool 51 of the rotary tool 50 enters becomes narrower. Then, as described above, at the joint portion between the upper surface plates 151, the inner surface is a curved surface 155 as indicated by a broken line from the inclined surface plate 153 to the upper surface plate 151, and the curved surface 155 portion is scraped off. This is not preferable because the required strength of the hollow extrusion mold 150 is also lowered. If an excessive thickness is formed in consideration of scraping, problems such as reduced stability of extrusion processing, increased material waste, and increased weight will occur.

  Therefore, the hollow extrusion mold material 1 of the present embodiment is configured with a cross-sectional shape as shown in FIG. 1 in consideration of such points. As described above, the hollow extruded mold 1 is provided with the plurality of slope plates 13 constituting the truss between the upper surface plate 11 and the lower surface plate 12, but the inclined portion of the end portion disposed with the joint portion interposed therebetween. The face plate 13a has a different cross-sectional shape from the other slope plates 13b. That is, when the inclined plate 13a is viewed from the lower surface plate 12 to the upper surface plate 11, a thin inclined portion 21 is first formed continuously from the lower surface plate 12, and further bent so as to be substantially orthogonal to the upper surface plate 11. The thick bent portion 22 is formed so as to be continuous.

  In the present embodiment, the inclined plate 13a is configured by the inclined portion 21 and the bent portion 22 in this manner, so that the pin tool 51 of the rotary tool 50 can be inserted while the inclination θ of the inclined portion 21 is further increased. A space between the portions 22 and 22 is secured.

  Next, the characteristics of the slope plate 13a and the other slope plate 13b at the joint portion of the hollow extruded mold 1 will be described in more detail. First, FIG. 3 is a view showing a part of the slope plate 13 b, and particularly a view showing the apex portion of the truss that the adjacent slope plates 13 b are constituted by the upper surface plate 11 or the lower surface plate 12. Here, the apex angle portion formed on the upper surface plate 11 side is shown, but the configuration is the same when it is formed on the lower surface plate 12 side.

  The slope plate 13b is formed such that the intersection point p3 of the reference line L passing through the approximate center thereof is located on the upper surface plate 11 or the lower surface plate 12. The thickness a of the upper surface plate 11 is 1.8 mm (the same applies to the lower surface plate 12), and the intersection point p3 of the reference line L is 0.5 mm from the surface of the hollow extruded mold 1 (the outer surface of the upper surface plate 11 or the lower surface plate 12). Only in the position moved inward. That is, the value of the distance b from the surface table of the hollow extrusion mold material 1 is 0.5 mm. In the present embodiment, the distance b from the surface of the intersection point p3 is located in the range of 0.3 mm to 70 percent of the plate thickness of the upper surface plate 11 or the lower surface plate 12.

  Next, see the joints between the slope plates 13a shown in FIG. The slope plate 13a is formed so that the intersection point p4 between the reference lines L1 of the inclined portion 21 is also located on the upper surface plate 11 (free end portion 15). In other words, the hollow extruded mold 1 is formed with the inclined portion 21 so that the reference line L1 has an inclination θ intersecting the end face of the free end portion 15. Therefore, the triangle connecting the reference line L1 and the lower surface plate 12 is closed in the hollow extrusion mold 1, and an externally stable truss is virtually formed.

  As described above, the hollow extruded mold 1 has the thicknesses of the upper surface plate 11 and the lower surface plate 12, the thickness a of the inclined plate 13b is 1.8 mm, and the inclined portion 21 of the inclined plate 13a has a thickness of 1.8 mm. It gradually changes to become thicker. On the other hand, the plate thickness c of the free end portion 15 of the top plate 11 has a thickness of 4.0 mm, and the thickness d of the bent portion 22 of the slope plate 13a is 4.5 mm thicker than that. ing. That is, regarding the virtual truss created by the reference line L1 of the slope plate 13a, the thickness of the portion where the reference line L1 does not actually overlap is formed thick, and the rigidity of the virtual truss near the top of the triangle is increased. The thickness d of the bent portion 22 is set to 90 to 130 percent of the plate thickness c of the free end portion 15 in this embodiment.

  Furthermore, the abutted free end portion 15 is constituted by a flat portion having a width e over both and an R corner portion to the bent portion 22. Here, the length f of the joint portion at the free end 15, that is, the distance between the bent portions 22, 22 is 22 mm by adding the curvature e of the corner R of 15 mm to the width e of the flat portion and 15 mm. It becomes. By the way, this is a case where the plate thickness c of the free end portion 15 is 4 mm. If the plate thickness c changes to 3 mm and 5 mm, the length f of the joint portion is changed to 18 mm and 26 mm accordingly. Therefore, regarding the plate thickness c and the length f of the joint at the free end 15, the three patterns I to III shown in FIG. 4 were considered as follows.

  Comparing the pattern II with I, the length f of the joint is about 82% of the pattern I of the pattern II, and the plate thickness c is 75%. Since the deformation amount due to the shearing force acting on the hollow extruded mold 1 is proportional to (length f / plate thickness c), the rigidity is lower in the case of the pattern I where the plate thickness c is thinner than the length f. Similarly, when comparing pattern II with III, the length f of the joint is about 18% increase in pattern III over pattern II, and the plate thickness c is increased by 25%. Therefore, the rigidity of the pattern III in which the increase amount of the plate thickness c is large becomes higher. However, in the case of Pattern III, the weight increases even if the rigidity is increased, and the difference in the other components such as the upper surface plate 11 becomes larger than the plate thickness (1.8 to 3.5 mm). This is contrary to the purpose of weight reduction. Therefore, in the present embodiment, as described above, the plate thickness c of the free end portion 15 is 4.0 mm, and the length f of the joint portion is 22 mm.

Next, the intersection point p4 of the reference line L1 of the inclined portion 21 of the inclined plate 13a has a value of the distance g from the surface of the hollow extruded mold 1 here also 0.5 mm. That is, the distance g from the surface of the intersection point p4 is set in the range of 0.3 mm to 70 percent of the plate thickness of the upper surface plate 11 or the lower surface plate 12 with respect to the surface, like the intersection point p3 described above.
Thus, the intersections p3 and p4 are set at positions separated from the surface by the distances b and g (offset amounts) because the intersections p3 and p4 and the upper surface plate 11 or the lower surface plate 12 or the thickness center of the free end portion 15 are set. This is because the rigidity against shear deformation in the cross section of the hollow extruded mold 1 can be improved.

  Here, FIG. 5 and FIG. 6 are graphs showing the deformation amount of the hollow extrusion mold material 1 with respect to the offset amount of the intersection P3. In both figures, the amount of deformation indicates a relative value when the amount of deformation is 1 when the intersection point p3 is positioned on the surface of the hollow extruded mold 1 (offset amount = 0) and the amount of offset is changed. FIG. 5 shows a case where the offset amount is expressed by an actual dimension, and FIG. 6 shows a case where the offset amount is expressed by a ratio in the plate thickness at the location where the intersection point p3 is located.

  In both figures, the amount of deformation changed with a parabola. That is, the position of the intersection point p3 moves away from the outer surface of the upper surface plate 11 or the lower surface plate 12, and the amount of deformation decreases and takes a minimum value as the offset amount increases. Further, when the value of the offset amount is further increased, the deformation amount is changed to increase. The offset amount of the intersection points p3 and p4 is most preferably set so that the deformation amount takes a minimum value.

  However, if, for example, the slope plates 13b where the intersection point p3 is located or the portion where the slope plates 13a and 13b intersect is too small or too large as shown in FIG. 1, the thickness of the R portion is increased. When the hollow extrusion mold material 1 is extruded, the material may not be easily removed from the mold. Therefore, the slope θ of the slope plates 13a and 13b needs to be within a predetermined range, and the offset amount corresponding to the minimum value shown in FIGS. 5 and 6 is not necessarily optimal. Therefore, it is necessary to determine a preferable offset amount within a certain predetermined range.

  In that case, since the thickness of each part of the hollow extrusion mold material 1 is not limited to that of the present embodiment, the thickness of the intersection p4 at the thick part such as the free end 15 is determined by the ratio as shown in FIG. As the offset amount becomes large, the opposite side of the intersection p3 is affected by the inclination θ of the slope plate 13a, and as described above, the problem of missing occurs. Therefore, in determining the range of the offset amount, the lower limit is taken from the actual distance from FIG. 5, and the upper limit is taken at the ratio shown in FIG. Therefore, the offset amount (distances b, g) is 70% of the plate thickness of the upper surface plate 11 (including the free end portion 15) or the lower surface plate 12 from a distance of 0.3 mm from the surface of the upper surface plate 11 or the lower surface plate 12. Within the range. In addition, if it is in this range, since the change of the rigidity with respect to the shear deformation is not so large, it is not always necessary to make the intersection point p3 of the inclined plate 13b coincide with the plate thickness center of the upper surface plate 11 or the lower surface plate 12.

  Subsequently, a rigidity experiment of the joint portion of the hollow extrusion mold material 1 will be described. 7 and 8 are diagrams showing the experimental results of the rigidity experiment. Here, the present embodiment shown in FIGS. 1 and 12 was compared with the conventional hollow extrusion mold materials 1 and 130. The test used the joining test molds 30 and 40 which were cut out with a pair of inclined plates 13a and 13a sandwiching the joint and extracted only the joint. The joining test molds 30 and 40 have the same thickness blocks 31, 32/41, 42 fixed at both ends, and the thickness of the upper surface plate and the lower surface plate, and the distance between them. ing.

  In the joining test molds 30 and 40, one of the blocks 31 and 41 is fixed to a rigid wall and cantilevered horizontally, and a vertical load W is applied downward to the blocks 32 and 42 on the free end side. In this rigidity experiment, how much the evaluation position S of the bonding test molds 30 and 40 was displaced in the vertical direction by the vertical load W was measured. Here, for the sake of easy understanding, the actual deformation amount is shown by 100 times. And from this experimental result, there was a difference in the amount of displacement between the two. When the measurement was performed at the evaluation point S on the block side where the vertical load W acts, the displacement amount of the joining test die 30 of this embodiment was suppressed to about 65 percent compared to the joining test die 40 of the conventional example. Therefore, the difference in deformation of the joining test molds 30 and 40 will be considered.

  First, when the deformation shape is seen, it is considered that the deformation of the joining test die 40 is large because the trapezoidal shape portion surrounded by points p, q, r, and s is structurally unstable. . The large deformation of the trapezoidal shape appears in the bending of the side plate 134, and the upper surface plate 31 constituting the triangular truss is also greatly bent by the amount of the bending of the lower surface plate 32. Therefore, it is considered that the displacement in the vertical direction of the entire joining test die 40 has increased.

On the other hand, the joining test mold 30 made of the hollow extrusion mold 1 of the present embodiment has a small vertical displacement, but this is stable in the structure of the trapezoidal approximate shape part surrounded by the points h, i, j, and k. It is thought that it is doing. That is, as shown in FIG. 1, the intersection point p4 of the reference line L1 of the opposing slope plate 13a is on the free end portion 15, and the intersection point p4 has high rigidity due to the thick free end portion 15 and the bent portion 22. This constitutes the triangular top of the virtual truss.
Therefore, although there is actually a side connecting the h point and the k point and the like is not a triangle, the deformation of the free end portion 15 and the bent portion 22 is very slight. The trapezoidal approximate shape portion surrounded by the points h, i, j, and k can be considered to overlap with the reference line L1 shown in FIG. 1 and constitute an externally stable truss shape. Therefore, since the bending amount of the slope plate 13b and the lower surface plate 12 is small, it is considered that the upper surface plate 11 is also less bent and the vertical displacement of the whole joining test die 30 is reduced.

  Therefore, in this embodiment, like the hollow extrusion mold material 110 shown in FIG. 11, the support plate 104 that connects the upper surface plate 101 and the lower surface plate 102 for friction stir welding, and the hollow extrusion mold material 130 shown in FIG. Further, the hollow extrusion mold 1 can be reduced in weight because there is no side plate 134 for connecting the upper plate 131 and the lower plate 132 to each other. Further, the sloped plate 13a is formed from the inclined portion 21 and the bent portion 22, and the free end portion 15 and the bent portion 22 are thickened to increase the rigidity so as to constitute a virtual truss, so that the hollow extruded mold 1 is abutted. The joint obtained by friction stir welding has an externally stable structure and can increase rigidity. Furthermore, the structure for a railway vehicle formed from such a hollow extruded mold 1 can be reduced in weight and rigidity.

Further, in the railway vehicle structure formed by joining the hollow extruded mold 1, the distance of the bent portion 132 sandwiching the joint portion is wide, and the pin tool 51 of the rotary tool 50 is inserted during the friction stir welding. As in the case of the hollow extruded mold 150 shown in FIG. 10, the material is not scraped off and the strength is not lowered.
Further, in the hollow extruded mold 1 of the present embodiment, the distances b and g from the surfaces of the intersections p3 and p4 by the inclined plate 13 are set within the range of 0.3 mm to 70 percent of the plate thickness of the upper plate 11 or the lower plate 12. Therefore, the intersection points p3 and p4 can be brought close to the plate thickness center of the upper surface plate 11 or the lower surface plate 12 or the free end portion 15, and the rigidity against the shear deformation in the cross section of the hollow extrusion mold material 1 can be improved. It was.

As mentioned above, although embodiment was described about the structure for railway vehicles which consists of the hollow extrusion mold material and its hollow extrusion mold material of this invention, this invention is not limited to this, A various change is possible in the range which does not deviate from the meaning. It is.
For example, in the above-described embodiment, the hollow extrusion mold material 1 constituting the structure for a railway vehicle has been described. However, the hollow extrusion mold material 1 having such a configuration is used as a construction material other than the railway vehicle or in other fields such as an aircraft. It may be a thing.

It is the figure which showed the junction part about one Embodiment of a hollow extrusion type | mold material. It is the figure which showed the joining state by a rotary tool about one Embodiment of a hollow extrusion type | mold material. It is the figure which showed the apex angle part of the truss which adjacent slope plates comprise with an upper surface board or a lower surface board about one Embodiment of a hollow extrusion type | mold material. It is the figure which showed three patterns I-III regarding the plate | board thickness and length of a junction part. The deformation amount of the hollow extrusion mold material with respect to the offset amount at the intersection of the reference lines is shown as a graph when expressed in actual dimensions. The deformation amount of the hollow extrusion mold material with respect to the offset amount of the intersection of the reference line is shown as a graph when expressed as a ratio in the plate thickness at the location where the intersection is located. It is the figure which showed the rigidity test of the joining test die material formed with the hollow extrusion die material of embodiment. It is the figure which showed the rigidity test of the joining test die material formed with the conventional hollow extrusion die material. It is the external view which showed the structure for railway vehicles comprised with the hollow extrusion type | mold material. It is the figure which showed the state which joins a junction part with a rotary tool about the conventional hollow extrusion type | mold material. It is the figure which showed the junction part of the hollow extrusion type | mold material which comprises the structure for rail vehicles. It is the figure which showed the junction part of the other hollow extrusion type | mold material which comprises the structure for rail vehicles.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hollow extrusion type | mold material 11 Upper surface board 12 Lower surface board 13 Slope board 15 Free end part 21 Inclined part 22 Bending part 50 Rotating tool 51,52 Pin tool 80 Rail vehicle structure 81 Side structure 83 Roof structure

Claims (8)

In a hollow extrusion mold material having a truss structure in which a cross section in the width direction is triangular by the upper surface plate, the lower surface plate and the inclined surface plate, a plurality of inclined surface plates are stretched between the upper surface plate and the lower surface plate.
The slope plate located at the end in the width direction among the slope plates is formed of an inclined portion and a bent portion bent in the vertical direction, and the upper surface plate or the lower surface plate protruding in the width direction from the bent portion and the bent portion. A hollow extrusion mold material, characterized in that a free end portion on the extension is formed to be thick. In the hollow extrusion mold material according to claim 1,
A hollow extrusion mold material, wherein an extension of a center line of the inclined portion intersects an end surface of the free end portion. In the hollow extrusion mold material according to claim 2,
The intersection of the center line and the end surface of the free end portion is from 0.3 mm when viewed from the vertical outer side surface of the free end portion to a position of 70 percent of the thickness of the free end portion. Hollow extrusion mold. In the hollow extrusion mold material according to any one of claims 1 to 3,
The intersection of the center lines of the adjacent slope plates is from 0.3 mm to the position of 70% of the thickness of the free end portion when viewed from the upper and lower outer surfaces of the upper surface plate or the lower surface plate. Hollow extrusion mold material. A hollow extrusion mold material having a truss structure in which a plurality of inclined plates are stretched between an upper surface plate and a lower surface plate, and a cross section in the width direction is triangular by the upper surface plate, the lower surface plate, and the inclined plate, and the hollow extrusion mold materials In the structure for a railway vehicle that is configured by abutting the width direction end faces and joining the abutting portions by stirring friction welding,
Of the inclined plates, an inclined plate located at the end of the hollow extrusion mold is formed of an inclined portion and a bent portion bent in the vertical direction, and the bent portion and the upper surface plate or the lower plate protruding from the bent portion are formed. A structure for a railway vehicle, characterized in that the free end portion on the extension is formed thick and the distance between the bent portions sandwiching the joint portion is separated by a dimension into which the pin tool of the rotary tool enters. In the railway vehicle structure according to claim 5,
The railcar structure according to claim 1, wherein an extension of a center line of the inclined portion intersects with a joined end face against which the free end is abutted. The structure for a railway vehicle according to claim 6,
The intersection of the center line and the joining end surface against which the free end is abutted is from 0.3 mm when viewed from the vertical outer side surface of the free end to a position of 70 percent of the thickness of the free end. A structure for a railway vehicle characterized by being. In the structure for a railway vehicle according to any one of claims 5 to 7,
The intersection of the center lines of the adjacent slope plates is from 0.3 mm to the position of 70% of the thickness of the free end portion when viewed from the upper and lower outer surfaces of the upper surface plate or the lower surface plate. Railway vehicle structure.

Images