JP2005263139A - Hollow extrusion - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hollow extrusion with increased rigidity of a joint. <P>SOLUTION: In this hollow extrusion 1, a plurality of slant plates 13 are connected between a top plate 11 and a bottom plate 12 in a diagonal direction, and side plates 14 are provided at both ends of a width direction approximately perpendicular to the top plate 11 and the bottom plate 12. Thick joints 15 projecting in a width direction from the side plates 14 are formed on extensions of both ends of the top plate 11 and the bottom plate 12. A intersection 23 between an extension of a centerline 21 of the slant plate 12 provided adjacent to the side plate 14 and the top face of the top plate 11 or the bottom face of the bottom plate 12 is situated nearer the joint 15 side than the upper and lower extensions of the side plate 14. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a hollow extrusion mold material used for a railway vehicle, a building, and the like, and more particularly, to a hollow extrusion mold material having a structure in which the rigidity of a joint portion is increased and a railway vehicle structure configured using 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. A hollow extrusion mold material constituting a structure of a railway vehicle 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. 9 is a view showing the joint structure of the hollow extrusion mold material described in Patent Document 1 below. The hollow extruded mold members 101, 102 are each provided with slanted plates 113, 113 ... in a truss shape in an oblique direction with respect to the first and second upper surface plate 111 and lower surface plate 112 each made of two parallel plates. The end portions 121 and 122 are provided with side plates 115 and 115 that are orthogonal to both plate materials. And the protrusion parts 123 and 124 formed so that it might fit in the edge parts 121 and 122 are piled up in parallel so that it may show in figure. Here, the upper surface plate 111 and the lower surface plate 112 are connected to each other at the abutting portions of the end portions 121 and 122 by friction stir welding using the rotary tool 200.
Japanese Patent Laid-Open No. 10-328856 (5th page, FIG. 2)

  However, the conventional hollow extrusion mold material has a problem that its rigidity is low due to the structure of the joint end portion. In other words, if a high pressure difference occurs between the interior and exterior of the vehicle body due to pressure fluctuations when the high-speed railcar enters or exits the tunnel or passes with the oncoming vehicle, a shear load is applied to the joint where the hollow extruded mold members 101 and 102 are joined. receive. On the other hand, the hollow extruded molds 101 and 102 have a truss-like shape as a whole by the slope plates 113, 113..., And thus have high rigidity against shearing force. Since it is supported by the orthogonal parallel side plates 115, 115, the structure is weak against the shearing force. On the other hand, since a slope plate cannot be inserted between the side plates 115, 115, it is required to increase the rigidity of the shape of such a joint.

  Accordingly, an object of the present invention is to provide a hollow extrusion mold material having a high joint rigidity and a railway vehicle structure using the hollow extrusion mold material in order to solve such problems.

  In the hollow extrusion mold material of the present invention, a plurality of inclined plates are connected in an oblique direction between an upper plate and a lower plate, and side plates are provided at both ends in the width direction so as to be substantially orthogonal to the upper plate and the lower plate. A thick joint protruding in the width direction from the side plate is formed on both ends of the upper surface plate and the lower surface plate, and the inclined plate provided next to the side plate has a center line The intersection of the line extended from the upper surface of the upper surface plate or the lower surface of the lower surface plate is closer to the joining portion than the vertical extension line of the side surface plate.

  Further, in the railway vehicle structure of the present invention, a plurality of slope plates are connected obliquely between the upper surface plate and the lower surface plate, and the side plates are substantially orthogonal to the upper surface plate and the lower surface plate at both ends in the width direction. A plurality of hollow extrusion mold materials provided with thick joints protruding in the width direction from the side plate on both end extensions of the upper surface plate and the lower surface plate are joined to each other and welded together. In the hollow extrusion mold material, an intersection of a line obtained by extending a center line of the slope plate provided adjacent to the side plate and an upper surface of the upper plate or a lower surface of the lower plate is the side plate. It exists in the said junction part side rather than on the up-and-down extension line of this.

  Therefore, according to the hollow extrusion mold material of the present invention, the intersection of the line extending the center line of the slope plate provided adjacent to the side plate and the upper surface of the upper surface plate or the lower surface of the lower surface plate is on the vertical extension line of the side plate. For example, in a railway vehicle structure configured by using the hollow extrusion mold material, the stress acting on the side plate of the joint portion is reduced with respect to the force applied during traveling. It was possible to increase the rigidity of the entire joint.

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 an end surface in the extrusion direction of the hollow extrusion mold material of the present embodiment.
This hollow extruded mold 1 is a truss in which a plurality of slope plates 13, 13... Are stretched between two parallel upper surface plates 11 and lower surface plates 12 while changing their inclination alternately. Shaped panel. Further, side plates 14, 14 orthogonal to the upper surface plate 11 and the lower surface plate 12 are provided at both left and right ends of the drawing, and on the extension of both ends of the upper surface plate 11 and the lower surface plate 12 from the side plates 14, 14. Protruding thick joints 15 and 15 are formed. In particular, the hollow extruded mold 1 of the present 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.

  When the hollow extruded mold members 1 and 1 are bonded to each other, the hollow extruded mold members 1 and 1 are arranged side by side, and the ends of the bonding portions 15 and 15 are abutted as shown in FIG. And the abutting part T of the junction parts 15 and 15 is joined by friction stir welding. The joining portion 15 is formed to be thicker than the upper surface plate 11 and the lower surface plate 12 on the inner side of the side surface plate 14. However, since the load of the rotary tool 50 is applied when performing friction stir welding, the joint portion 15 can withstand that load. This is because the rigidity to obtain is necessary. When joining the upper surface plates 11 and 11 by friction stir welding, the rotating shaft of the rotary tool 50 is pressed against the abutting portion T of the joints 15 and 15, and the rotary tool 50 is moved in the longitudinal direction (see the drawing). Move along the direction of penetration). At this time, the abutting portion T between the joining portions 15 and 15 generates heat and softens, causing plastic flow and solid phase joining. The abutting portion T at the tip of the joints 15 and 15 is similarly friction stir welded on the opposite lower surface plates 12 and 12 side.

Next, about the hollow extrusion mold material 1 of this embodiment joined in this way, the rigidity of the junction part is demonstrated compared with the rigidity of the junction part by a conventional hollow extrusion mold material. FIG. 3 shows a comparison of joint structures such as the hollow extrusion mold material of the present embodiment and the conventional hollow extrusion mold material. Among these, Fig.3 (a) shows the junction part of the conventional hollow extrusion mold material 1m, and FIG.3 (c) has shown the junction part of the hollow extrusion mold material 1 of this embodiment. FIG. 3B shows a joint portion of the hollow extruded mold 1n at an intermediate stage, which shifts from the conventional type to that of the present embodiment.
All of the hollow extruded molds 1, 1m, 1n have the same shape. Therefore, the same constituent members are given the same numbers, and those shown in FIGS. 3A and 3B are distinguished by adding m and n at the end. And about the description of a structure common to all, although the code | symbol of the structural member of the hollow extrusion mold materials 1m and 1n is abbreviate | omitted, it is set as description of what attached m and n suitably.

  As shown in the figure, the joined portions of the hollow extruded molds 1, 1m, and 1n have the same shape. That is, as shown in FIGS. 3A to 3C, the upper surface plates 11 and 11 and the lower surface plates 12 and 12 are connected to each other by the joint portions 15 and 15 so as to be flush with each other. Side plates 14 and 14 are arranged in parallel at symmetrical positions with a joining line L overlapping (see FIG. 2). In addition, the slope plates 13 and 13 provided next to the side plates 14 and 14 are connected to the bottom plate 12 and 12 in a bilaterally symmetrical manner. The hollow extrusion mold materials 1, 1 m and 1 n to be compared are formed with the same dimensions in terms of the thickness of each member and the distance between the upper surface plate 11 and the lower surface plate 12.

However, the hollow extrusion mold materials 1, 1m, and 1n are formed in substantially the same shape. However, the hollow extrusion mold material 1 of the present embodiment is a conventional hollow extrusion mold material in the following points in order to increase the rigidity of the joint portion. It is different from 1m. That is, the method of attaching the slope plate 13 located adjacent to the side plate 14 is different from the slope plates 13m and 13n of the hollow extruded molds 1m and 1n shown in FIGS.
Therefore, the difference is compared by the relationship between the position of the action point 23 where the center line 21 of the slope plate 13 abuts the lower surface of the lower surface plate 12 and the outer surface (reference line) 22 of the side surface plate 14. That is, it is confirmed whether the action point 23 is inside or outside the rectangular portion 40 formed by the left and right side plates 14, 14 and the upper and lower joint portions 15, 15.

First, in the conventional hollow extruded mold 1m shown in FIG. 3A, the center line 21m does not intersect the reference line 22m. That is, the action points 23m and 23m are located outside the rectangular portion 40m with the distance Bm wider than the interval between the reference lines 22m and 22m.
Next, in the hollow extruded mold 1n shown in FIG. 3C shown as an intermediate example between the conventional type and the present embodiment, the center line 21n and the reference line 22n are just overlapped with the lower surface of the lower surface plate 12n. Therefore, the action points 23n and 23n are located on the quadrangular portion 40n with the distance Bn matching the interval between the reference lines 22n and 22n.
And in the hollow extrusion mold material 1 of this embodiment, the center line 21 and the reference line 22 cross. Therefore, the action points 23 and 23 are located on the inner side of the rectangular portion 40 with the distance B being narrower than the interval between the reference lines 22 and 22.
The distance Bm of the hollow extrusion mold 1m in FIG. 3A is 22 mm, the distance Bn of the hollow extrusion mold 1n in FIG. 3B is 16 mm, and the distance B of the hollow extrusion mold 1 in FIG. 3C is 10 mm. Met.

The difference between the positions of the action points 23 and 23 is that the angle formed between the inclined plate 13 and the upper surface plate 11 is different, and the angle of the hollow extruded mold 1n shown in FIG. 3B is the same as that shown in FIG. This is because the hollow extrusion mold 1 is smaller than the hollow extrusion mold 1m, and the angle of the hollow extrusion mold 1 shown in FIG. 3C is smaller than that of the hollow extrusion mold 1n shown in FIG.
Due to these differences, in the hollow extruded mold 1m of FIG. 3 (a), the inclined plate 13m is connected to the lower surface plate 12m side, whereas in the hollow extruded mold 1 of FIG. 3 (c), the inclined plate 13 The lower surface plate 12 side connecting portion is connected at a position so as to rise to the side plate 14 side.

  Next, FIG. 4 is a diagram showing a rigidity experiment of the joint portion by the hollow extrusion mold material 1. Although not shown, the same rigidity experiment is performed for the hollow extruded molds 1m and 1n. In this rigidity experiment, the hollow extrusion mold materials 1 and 1 are cut by one inclined plate 13 and 13 to extract only the joint portion, and the joint test mold material 30 (hollow extrusion mold material 1m, The one formed with 1n is used as a joint test mold material 30m, 30n.). Then, one block 31 is fixed to a rigid wall so that the joining test die 30 is horizontal, and a vertical load W is applied to the other block 32 side, and the vertical load W determines how vertical the evaluation position S of the joining test die 30 is. It was measured whether it was displaced in the direction.

FIG. 5 is a diagram showing an experimental result of the rigidity experiment. In other words, the joining test molds 30, 30m, and 30n deformed by the vertical load W are shown in an overlapping manner, and the actual deformation amount is shown by 100 times for easy understanding.
From these experimental results, it can be seen that the displacement amounts of the joining test molds 30, 30m, and 30n are different. The vertical displacement at each evaluation position S is 0.227 mm for the conventional bonding test mold 30 m, 0.158 mm for the intermediate bonding test mold 30 n, and 0.102 mm for the bonding test mold 30 of the present embodiment. And the value was the smallest.

When the same vertical load W is applied, the vertical displacement of the evaluation position S between the joining test molds 30, 30m, and 30n is so different because of the difference in deformation amount of the square portion 40 that is not in the truss shape. it is conceivable that. Therefore, the rigidity of the rectangular portion 40 will be considered below.
First, since the space | interval of the side plates 14 and 14 at the time of joining the hollow extrusion mold materials 1 and 1 etc. needs a fixed space | interval by design, it cannot change freely. Therefore, the joint portions of the hollow extruded molds 1, 1m, and 1n are formed so that the intervals between the side plates 14 and 14 are equal. Accordingly, the quadrangular portions 40, 40m, 40n such as the joining test mold 30 have the same shape and dimensions.

Next, when the difference in the amount of vertical displacement is compared with respect to the deformation shape of the bonding test mold members 30, 30m, and 30n, the deformation of the side plate 14m and 14n of the bonding test mold members 30m and 30n with respect to the side plate 14 of the bonding test mold member 30. Can be seen to be large.
Therefore, the stress generated in the joining test molds 30, 30m, and 30n when the vertical load W is applied to the deformation was verified. 6 to 8 are diagrams showing the stress distributions of the joining test molds 30m, 30n, and 30 in order. In each drawing, it is shown that the stress becomes relatively higher as the color becomes darker.

  As shown in FIG. 6 to FIG. 8, when the vertical load W is applied to the joining test molds 30, 30m, 30n, the side plates 14, 14m, 14n are subjected to high stress due to the darkness. I understand. In particular, the stress in the vicinity of the connecting portion between the upper surface plate 11 and the lower surface plate 12 is high. Therefore, the stresses in the vicinity of the connecting portions of the side plates 14, 14m, 14n with the lower surface plate 12 were measured. Then, although the left and right side plates 14, 14m, and 14n are somewhat different, the maximum stress was 77.6 MPa in the conventional joining test mold 30m shown in FIG. 6, whereas the joining test of the intermediate example shown in FIG. The mold material 30n was 55.5 MPa, and the joining test mold material 30 of the present embodiment shown in FIG. 8 was only 38.6 MPa.

  Here, how to apply a force when a vertical load W is applied to the joint test molds 30, 30m, and 30n will be considered. When the vertical load W acts on the block 32 of the joint test mold 30 (the same applies to the joint test molds 30m and 30n), a shearing force acts on the upper surface plate 11 and the lower surface plate 12, and a compressive force acts on the slope plate 13. To do. By such a force, a moment acts on the rectangular section 40 having a rectangular cross section formed by the left and right side plates 14, 14 and the upper and lower joint portions 15, 15, and deformation is applied.

  When a moment acts on the rectangular portions 40, 40m, and 40n, the joint portion 15 formed of a thick wall has a high rigidity, and is hardly deformed as can be seen from FIG. On the other hand, the side plates 14 and 14 are thin, and are greatly influenced by the moment and deformed. The amount of deformation is proportional to the stress applied to the side plates 14 and 14, and the side plate 14m and 14m are the most deformed with respect to the joint test mold 30m in which the largest stress is applied to the joint portions Pm and Pm. The joining test die 30 having the smallest stress in the vicinity of the connecting portion P and P had the smallest deformation amount of the side plates 14 and 14.

That is, the deformation of the joint test mold 30 by the hollow extrusion mold 1 of the present embodiment was small and the rigidity was high because the deformation of the rectangular portion 40 was small, that is, it acts on the side plates 14 and 14. This is probably because the stress is small.
As a configuration for that purpose, the hollow extruded mold 1 of the present embodiment is characterized by the position of the connecting portion of the slope plate 13 adjacent to the side plate 14, and the action point 23 shown in FIG. That is, it is formed so as to be located in the rectangular portion 40.

In the case of the bonding test mold 30m, the reaction force of the compressive force that compresses the inclined plate 13m acts on the action point 23m. A moment acts on the side plate 14m through a rigidly joined portion where the slope plate 13m and the side plate 14m are welded to the bottom plate 12m, and stress acts on the side plate 14m.
In the case of the bonding test die 30n, the reaction force of the compressive force that compresses the inclined plate 13n acts on the action point 23n. Then, a moment acts on the side plate 14n through a rigidly joined portion where the slope plate 13n and the side plate 14n are welded to the lower plate 12n, and a stress acts on the side plate 14n.

  On the other hand, in the case of the joining test mold 30, a reaction force of the compressive force that compresses the slope plate 13 acts on the action point 23. Here, when the stress states applied to the joints 15, 15m, and 15n shown in FIGS. 6 to 8 are compared, the stress applied to the joint test mold 30m is small, whereas the position of the action point 23 exceeds the reference line 22. Accordingly, the stress gradually increased from the bonding test mold 30 n to the bonding test mold 30. Therefore, the force acting on the action point 23 brings the action point 23 onto the joint 15 to increase the stress applied to the joint 15 while reducing the moment for deforming the side plate 14. .

Therefore, according to the hollow extrusion mold material 1 of the present embodiment, since the slope plate 13 adjacent to the side plate 14 is formed so that the action point 23 is located at the joint 15 beyond the reference line 22, the hollow extrusion mold material It was possible to reduce the deformation amount of the rectangular portion 40, particularly the side plates 14, 14, which is a joined portion obtained by joining 1 and 1. That is, the hollow extrusion mold material 1 of the present embodiment was able to increase the rigidity of the joined portion where the hollow extrusion mold materials 1 and 1 were joined together.
Moreover, the vehicle body strength of the high-speed railway vehicle could be ensured by configuring the vehicle structure using the hollow extrusion mold material 1 with the increased rigidity of the joint portion. In addition, the strength of the vehicle body can be increased at a low cost without greatly changing the design.

As mentioned above, although one embodiment of the hollow extrusion mold material which concerns on this invention was described, this invention is not limited to this, A various change is possible in the range which does not deviate from the meaning.
In the hollow extrusion mold 1, the joint portion in a state where the slope plate 13 is connected to the lower surface plate 12 on the side plate 14 side is shown, but the slope plate 13 is turned to the upper surface plate 11 on the side plate 14 side upside down. It may be connected.

It is the figure which showed the extrusion direction end surface about one Embodiment of the hollow extrusion mold material. It is the figure shown about joining of hollow extrusion mold materials. FIG. 2 shows a comparison of the joint structure of a hollow extrusion mold material. FIG. (A) shows a conventional type, FIG. (B) shows an intermediate part, and FIG. (C) shows a joint part of the hollow extrusion mold material of this embodiment. It is a figure. It is the figure shown about the rigidity experiment of the junction part by a hollow extrusion mold material. It is the figure which compared the deformation | transformation shape of the joining test type | mold material by a vertical load, and the actual deformation | transformation was multiplied by 100 times so that it might be easy to understand. It is the figure which showed the stress distribution of the joining test type | mold material by the conventional hollow extrusion type | mold material. It is the figure which showed the stress distribution of the joining test type | mold material by an intermediate | middle hollow extrusion type | mold material. It is the figure which showed the stress distribution of the joining test die material by the hollow extrusion die material of this embodiment. It is the figure which showed the junction part structure of the conventional hollow extrusion type | mold material.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Medium extrusion type | mold material 11 Upper surface board 12 Lower surface board 13 Slope board 14 Side board 15 Joint part 21 Center line 22 of a slope board The outer surface (reference line) of a side board
23 working point 30 joint test die 40 square part

Claims (2)

A plurality of inclined plates are connected obliquely between the upper surface plate and the lower surface plate, and side plates are provided at both ends in the width direction so as to be substantially orthogonal to the upper surface plate and the lower surface plate. In the hollow extrusion mold material formed with a thick joint protruding in the width direction from the side plate on the extension,
The slope plate provided next to the side plate is such that the intersection of the line extending the center line and the upper surface of the upper surface plate or the lower surface of the lower surface plate is more than the vertical extension line of the side plate. Hollow extrusion mold material characterized by being on the side. A plurality of inclined plates are connected obliquely between the upper surface plate and the lower surface plate, and side plates are provided at both ends in the width direction so as to be substantially orthogonal to the upper surface plate and the lower surface plate. In the railway vehicle structure constituted by welding a plurality of hollow extruded mold members formed with thick joints protruding in the width direction from the side plate on the extension, butting the joints together,
In the hollow extrusion mold material, an intersection of a line obtained by extending a center line of the inclined plate provided adjacent to the side plate and an upper surface of the upper plate or a lower surface of the lower plate is on a vertical extension line of the side plate. A railway vehicle structure characterized by being on the side of the joint portion.