JPH09226571A - Aluminum alloy profiles for railway vehicles - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an aluminum alloy shape for a rolling stock, capable of effectively improving a sound insulation characteristic through the change of only the sectional form thereof, without any weight or cost increase. SOLUTION: Regarding an aluminum alloy shape for application to a rolling stock, obtained via the extrusion of an aluminum alloy and formed to have the face plate parts 2 and 4 of flat plate type and a rib part 6 standing as integral part thereof for extension in a direction separating from the surface of one of the face plate parts 2 and 4, the thickness of the face plate parts 2 and 4, and/or the rib part 6 is changed at a grooved recess part or a projection part. In addition, the effective thickness of a foot part 8 for the connection of the rib part 6 is increased for the face plate parts 2 and 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aluminum alloy profile for a railroad vehicle, which is used as a floor, wall, roof material, etc. of a railroad vehicle to form a vehicle body structure.

[0002]

[Background Art] In order to meet the recent demand for weight reduction and strength enhancement associated with speeding up of railway vehicles, a flat plate-shaped face plate portion obtained by extrusion processing of an aluminum alloy, and the face plate portion. An aluminum alloy profile having a rib portion that integrally rises and extends in a direction away from one surface has been used as a member constituting a railway vehicle body structure. And, the weight reduction of the vehicle using this aluminum alloy profile has been promoted as a countermeasure against the increase in vibration and noise to the environment due to the speeding up of railway vehicles, but on the other hand, such weight reduction is There is a new demand for measures to increase the vibration and noise in the vehicle, and for that purpose, it is considered to cope with it by improving the vibration damping property and the sound insulating property by applying the vibration damping material and the sound absorbing material. Further, in some cases, contrary to the weight reduction, a method of expecting the mass effect and partially increasing the weight of the portion where the sound insulation is required to be improved is also considered.

[0003] In short, in order to improve the sound insulation properties of aluminum alloy profiles, conventionally, a mass law method for increasing the areal density of a material through which sound is transmitted, a damping material, and a sound absorbing material are applied, and sound energy is applied. It has been considered to adopt a method of absorbing sound, a hollow structure, a multilayer structure such as a sandwich structure to reduce the transmission of sound due to the incident effect, a method due to the vibration isolation effect provided by the spring effect due to the air layer, etc. However, none of these methods provided sufficient countermeasures. That is, including the method based on the above-mentioned mass law and all other methods including the method of applying the method, the weight of the aluminum alloy profile is increased, and in the railway vehicle body structure, The purpose of this is to deviate from the purpose of reducing the weight required for the members used in the above. Furthermore, in the above method and method, the structure becomes complicated and other materials are used, so that the number of materials used increases. However, there is an inherent problem that the manufacturing process is increased and the cost is increased.

[0004]

The present invention has been made in view of such circumstances, and the problem to be solved is that only the cross-sectional shape of a shape member is brought about without causing an increase in weight or cost. The purpose of the present invention is to provide an aluminum alloy profile for railway vehicles that can effectively improve the sound insulation characteristics.

[0005]

In order to solve such a problem, the present invention provides a flat plate-shaped face plate portion obtained by extrusion processing of an aluminum alloy and an integrated body in a direction separating from one face of the face plate portion. A rail vehicle aluminum alloy profile having a rib portion that rises up and extends to the face plate portion and / or the thickness of the rib portion in the vibration or sound propagation direction from the thin portion to the thick portion In the direction of propagation of the vibration or sound, and
The gist of the present invention is an aluminum alloy profile for a railway vehicle, which is characterized in that it is provided in more than one place.

Another object of the present invention is to provide a flat plate-like face plate portion obtained by extrusion processing of an aluminum alloy and a rib extending integrally upright in a direction away from one surface of the face plate portion. An aluminum alloy profile for a railroad vehicle having a portion, and increasing the effective thickness of the root portion where the rib portion is connected to the face plate portion, with respect to the face plate portion and / or the rib portion, The effective thickness of the root portion with respect to the face plate portion is 1.5 times the thickness of the face plate portion.
On the other hand, the effective thickness of the root portion with respect to the rib portion is equal to or more than twice the thickness of the rib portion.
The aluminum alloy profile for a railway vehicle, which is characterized in that it is configured to be 0 times or more, can be advantageously solved.

Further, the above object of the present invention is to provide a flat plate-like face plate portion obtained by extrusion processing of an aluminum alloy and a rib portion integrally rising and extending in a direction away from one surface of the face plate portion. And a thickness of the face plate portion and / or the rib portion in the direction of vibration or sound propagation is 1.3 times the change ratio from the thin portion to the thick portion. The thickness is changed as described above, and two or more thickness changing portions are provided in the vibration or sound propagation direction.
To increase the effective thickness of the root portion to which the rib portion is connected to the face plate portion with respect to the face plate portion and / or the rib portion, in the effective thickness of the root portion with respect to the face plate portion, The thickness of the face plate portion is 1.5 times or more, while the effective thickness of the base portion with respect to the rib portion is 2.0 times or more the thickness of the rib portion. The aluminum alloy profile for railway vehicles, which is characterized by the above, can be more effectively solved.

As described above, according to the present invention, the cross-sectional shape of the aluminum alloy profile for a railroad vehicle expands the second moment of inertia of section and the difference in acoustic impedance at each location, thereby making it possible to absorb, transmit, and radiate sound. The efficiency is reduced and the sound insulation characteristics of the profile are improved.

That is, in the aluminum alloy profile for railway vehicles, assuming the case where vibration and sound propagate, the cross-sectional shape of the face plate portion or rib portion and the root portion of such profile member, for example, face plate portion or rib. In the part, the thickness is changed by grooves and protrusions in the direction of propagation of vibration and sound, and in the base part, the connecting part between the face plate part and the rib part is enlarged to increase the cross-sectional area. The effective thickness in the direction of vibration or sound propagation to the ribs or ribs is increased by a predetermined factor or more, and the acoustic impedance in the direction of propagation is changed to reduce the transmittance of vibration or sound. .

According to one of the preferred embodiments of the aluminum alloy profile for a railway vehicle according to the present invention, the face plate portion and / or the rib portion has a thickness changing portion provided with a plurality of rib portions. The central portion of the portion located between the adjacent rib portions in the face plate portion, or is formed by a groove-shaped recess provided in the central portion of the rib portion, by the formation of the groove-shaped recess in such a central portion, The feature is that the resonance point rises and the attenuation increases.

According to another aspect of the present invention, the thickness change portion of the face plate portion and / or the rib portion is a portion close to the root portion of the face plate portion or the root portion of the rib portion. It is composed of a protrusion provided in the part close to the part,
In this way, by providing the protrusion at a position closer to the end side than the central part to realize the thickness change, it is possible to advantageously suppress the sound transmission without lowering the resonance point. .

Therefore, in the case where the face plate portion and / or the rib portion of the aluminum alloy profile is changed in thickness by the formation of the groove-like concave portion and the protruding portion, each of the above-mentioned respective It is possible to exhibit the characteristics together, and thus to obtain more excellent sound insulation characteristics.

Further, the aluminum alloy profile for a railway vehicle according to the present invention is preferably a hollow (hollow) extrusion profile composed of two face plate parts and a plurality of rib parts connecting the two face plate parts. Is intended for. In particular, by applying the present invention to such a hollow extruded profile, the effect of the present invention is advantageously added to the features of the hollow profile, and the features of the present invention are maximized. There are advantages that can be demonstrated.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION By the way, an aluminum alloy profile used in a railway vehicle structure to which the present invention is applied is shown in FIG.
As shown as an example of a cross-sectional view in Fig. 2, two flat plate-shaped upper and lower face plate portions 2 and 4 are positioned to face each other with a predetermined distance therebetween, and the face plate portions 2 and 4 are A hollow structure is integrally formed by a plurality of rib portions 6 which are alternately interposed in a reverse direction with a predetermined angle therebetween. That is, in such a shape member, the rib portions 6 stand up integrally in the inclined form in the direction away from the inner side surfaces of the respective face plate portions 2 and 4, and extend to the other face plate portion side, And, it is connected to the face plate portions 2 and 4 so as to be in contact with one end of the adjacent rib portions 6 to form the root portion 8. Further, between the face plate portions 2 and 4, a plurality of rib portions 6 are formed. A plurality of triangular-shaped internal voids 10 partitioned by the above are continuously formed in the longitudinal direction of the profile (the direction perpendicular to the paper surface in the figure).
Then, the vibration and the sound are propagated in the horizontal direction and the vertical direction (in FIG. 1) of the profile. In addition, such a profile is JIS A600
It is obtained by ordinary extrusion using an aluminum alloy in the 0s, etc., and is generally known as a hollow extrusion profile or a hollow extrusion profile.

According to the present invention, in the aluminum alloy profile as shown in FIG. 1, the cross-sectional shape of the face plate portions 2, 4 and the rib portion 6, and further the root portion 8, in other words, the thickness is changed. It is intended to expand the second moment of area of the section and the difference in acoustic impedance and reduce the efficiency of sound incidence, transmission, and radiation. For example, the face plate portions 2 and 4 are shown in FIG. As described above, the depth of the face plate 4 (2) located between the bases 8 to which the ribs 6 are connected in the longitudinal direction (the horizontal direction in the drawing) is set so that the depth becomes the deepest. Groove-shaped recess 1 that gradually changes
2 is formed on the inner side surface of the face plate portion 4 (2). Due to the formation of the groove-shaped recess 12, the face plate portion 4 (2) has a thickness in the central portion between the root portions 8 and 8. While it is configured to be the thinnest, it is configured to be the thickest at the end on the root portion 8 side. In addition, even in the rib portion 6, as shown in FIG. 2B, groove-shaped concave portions 12, 12 whose depth gradually changes from both sides are respectively provided at the central portion in the length direction thereof. The thickness of the portion is thinnest, and the thickness is gradually increased toward the end portion of the rib portion 6, that is, the root portion 8, in other words, the thickness is thickest at the end portion on the root portion 8 side. It is supposed to be.

However, the groove-shaped recess 12 formed in the face plate portion 4 (2) or the rib portion 6 in this way is not limited to the shape in which the depth gradually changes as shown in the example, and its cross section is not limited. Even if it has a stepped structure that gives a rectangular groove, there is no problem and the change in thickness of the face plate portions 2 and 4 and the rib portion 6 is changed as shown in FIGS. 2 (c) and 2 (d). It can also be realized by forming the protrusions (protrusions) 14 so that the thickness becomes thicker than other portions of the face plate portions 2 and 4 and the rib portion 6. It should be noted that the groove-shaped recess 12 provided in the face plate portions 2 and 4 may be provided at the central portion in each length direction as illustrated.
It is effective in raising the resonance point and increasing the damping, and in the projection 14, as shown in the example, the end plate side portions of the face plate portions 2 and 4 and the rib portion 6 which are close to the root portion 8 Is effective in suppressing sound transmission without lowering the resonance point.

In the present invention, when the thicknesses of the face plate portions 2 and 4 and the rib portion 6 are changed in the vibration or sound propagating direction by the groove-shaped concave portions 12 and the protrusions 14, From the thin portion (thickness: t ₁ ) to the thick portion (thickness: T ₁ ), in the case of FIG. 2A and FIG. 2B, the face plate portions 2, 4 as shown in FIG. And the change rate (T ₁ / t ₁ ) of the rib portion 6 to the thickness of the end portion on the root portion 8 side) is 1.3 times or more, preferably 1.4 times or more. Two or more thickness changing portions are provided in the vibration or sound propagation direction. That is, such a thickness change ratio (T ₁ / t ₁ )
By 1.3 times or more, and by providing at least two locations where the thickness changes, it is possible to achieve practical transmission loss of vibration and sound, thus improving effective sound insulation characteristics in practical use. Can be achieved. In addition, the thickness-changed portion here means each of a portion where the thickness is thin and a portion where the thickness is thick, and the groove-shaped concave portion 12 and the protruding portion 14 are exemplified.
In this case, two thickness-changed portions are formed on the left and right of each of them, which change in the direction in which the thickness decreases or vice versa.

Further, according to the present invention, the face plate portions 2 and 4 are relieved.
The face plate portions 2 and 4 of the root portion 8 to which the tab portion 6 is connected.
By increasing the effective thickness for the ribs and ribs 6,
Physically, as shown in FIG.
The connecting curved portion between the face plate portions 2 and 4 and the rib portion 6 is formed.
Curvature radius: R₁, R_ThreeOr a curved connecting portion between the rib portions 6, 6.
Radius of curvature: R_TwoRealized by increasing
It will be. Here, the base for the face plate portions 2 and 4
The effective thickness of the portion 8 means the radius of curvature: R₁(R _Three) Circle
Midpoint of arc: O₁By a straight line parallel to the face plate parts 2 and 4 passing through
Defined thickness: T_TwoAnd also for the rib portion 6
The effective thickness of the root portion 8 is the radius of curvature: R₁(R
_Three) Midpoint of arc: O₁And the radius of curvature: R_TwoOf the arc
Midpoint: O _TwoThrough each of the₁, O_Twowhile
Distance between two straight lines parallel to the rib portion 6 located at: T_Three
Is defined as

In the present invention, the effective thickness T ₂ of the base 8 with respect to the face plate portions 2 and 4 is 1.5 times or more than the thickness t ₂ of the face plate portions 2 and 4. , Preferably 1.7 times or more, and the effective thickness: T ₃ of the base portion 8 to the rib portion 6 is the thickness of the rib portion 6: t _3.
Is 2.0 times or more, preferably 2.5 times or more, and by this, practical vibration damping and sound insulation characteristic improving effects can be realized, and their effective thicknesses: T ₂ , T ₃ are
Below the respective prescribed value, the object of the present invention can no longer be fully achieved. It should be noted that the larger the change rate of the thickness is, the more effective it is to reduce the transmission of vibration and sound, but from the viewpoint of the actual production of the aluminum alloy profile, the limit is 5 times.

By the way, in the case where vibrations and sounds propagate as longitudinal waves in places having different acoustic impedances, the energy transmittance thereof can be expressed by the following equation, as is well known. In the case of the same material, the acoustic impedance is proportional to the thickness of the plate. The same applies to the case of transverse waves. Energy transmittance = 4 / [√ (acoustic impedance ratio)
+ √ (1 / acoustic impedance ratio)] ²

Therefore, in order to reduce the transmittance (energy) of vibration and sound from the above equation, it is effective to change the acoustic impedance in the propagation direction and increase the acoustic impedance ratio. Therefore, in the present invention, as described above, the predetermined thickness change portion (1) is formed on the face plate portions (2, 4) and the rib portion (6).
2, 14) are provided in plurality, or the effective thickness of the root portion (8) is increased by a predetermined ratio or more.

Incidentally, in FIG. 3, when vibration or sound propagates through the plate-like body, the relationship between the degree to which the plate thickness in the propagation direction is changed (plate thickness ratio: σ) and the transmission loss is calculated. The graph obtained by
Although the graphs showing the relationship between the acoustic impedance ratio and the transmission loss are shown, it is clear from those figures that the transmission loss or the transmission loss can be increased by increasing the plate thickness ratio or the acoustic impedance ratio (separated from 1). Can greatly increase the transmission loss and effectively suppress the propagation of vibration and sound.

In addition, in the aluminum alloy profile according to the present invention, the effective thickness of the root portion 8 is increased, so that the cross-sectional area is expanded, and thereby the second moment of area of the profile is improved. , It also improves the acoustic impedance of the entire profile, but this also increases the difference from the acoustic impedance of the atmosphere, and therefore the incidence rate of sound based on such acoustic impedance difference. In addition, the sound insulation characteristics can be effectively improved due to the decrease in emissivity.

As described above, according to the present invention, the sectional moment of inertia and the difference in acoustic impedance at each location are enlarged depending on the cross-sectional shape of the profile to reduce the efficiency of sound incidence, transmission and radiation. 5 and 6 show another example of such an aluminum alloy profile according to the present invention, which is designed to improve the sound insulation characteristics of the profile.

That is, the aluminum alloy profile for a railway vehicle according to the present invention shown in FIG. 5 is similar to the profile shown in FIG. 1, in the form in which a plurality of rib portions 6 are inclined in opposite directions to each other. It is formed as an integrally formed extruded shape member that connects the two face plate portions 2 and 4, and is formed in the center portion of the rib portion 6 and the center portion between the root portions 8 of the upper and lower face plate portions 2 and 4. The stepped groove 12 is provided in a predetermined length, and the upper and lower face plate portions 2 and 4 are provided with protrusions 14 at positions close to the base 8, respectively. , Radius of curvature R ₁ , R ₃ between the face plate portions 2, 4 and the rib portion 6 and radius of curvature R ₂ between the rib portions 6, 6.
Is set to have a larger radius of curvature than before, and its effective thickness T
₂ , T ₃ are made large, and the cross-sectional area of the root portion 8 is enlarged.

Further, in the aluminum alloy profile for a railway vehicle according to the present invention shown in FIG. 6, the upper and lower face plate portions 2 and 4 are a plurality of parallel rib portions opposed to each other at a predetermined interval. 6 is formed as a hollow extruded shape member that is integrally connected by 6 and has a hollow section 10 having a rectangular cross-sectional shape formed therein. The stepped groove recess 12
Is formed, and a similar groove-shaped recess 12 is formed inside the upper face plate portion 2. Further, a protrusion 14 is provided at a position close to the base portion 8 of the upper and lower face plate portions 2 and 4. ,
It is provided at a predetermined height.

A plurality of aluminum alloy profiles shown in FIGS. 5 and 6 are welded, bolted, or the like at the edge portions in the width direction, either directly or through appropriate connecting members. By being connected with each other, the floor, side walls, roof, etc. of the railcar are formed to form the railcar structure.

As described above, the present invention is applied to a hollow extruded profile having a hollow structure as shown in the figure and exhibits excellent characteristics. However, the present invention is limited to such a hollow extruded profile. However, the extruded profile having the structure shown in FIG. 7 can be advantageously applied.

The profile shown in FIG. 7 is an extruded structure having an integral structure in which a plurality of rail-shaped rib portions 18 are vertically arranged on a flat plate-shaped face plate portion 16 at a predetermined interval. The rib portions 18 and 1 of the face plate portion 16 are formed as materials.
The groove-shaped concave portion 12 and the protrusion 14 with respect to the portion located between 8
And the rib portion 18 is formed with respect to the face plate portion 16.
In the base 20 to which is connected, the left and right radii of curvature are made large, and the cross-sectional area of the relevant portion is enlarged. In addition, in such a shape member, an interior material, a pillar, or a beam is arranged on the head of the rib portion 18 to form a railway vehicle structure.

In the aluminum alloy profile for a railroad vehicle according to the present invention as described above, the thickness of the face plate portion or the rib portion is changed by the groove-shaped recesses or protrusions, and the cross-sectional shape of the root portion (effective Since it is just an expanded thickness, it can be obtained by adding a device to the extrusion die, and no special manufacturing process or material is required. The alloy extrusion process can be applied as it is, and the target profile can be easily manufactured.

[0031]

EXAMPLE An aluminum alloy profile for a railway vehicle according to the present invention shown in FIG. 5 was extruded using an aluminum alloy: A6N01 material according to a conventional method.
Manufactured. In addition, the thickness of the upper and lower face plate portions 2 and 4 is 2.5 m.
m, and a protrusion 14 with a height of 2 mm near the base portion 8
Is provided, and the thickness of the face plate portion is 1.8 at the central portion.
The groove-shaped recess 12 was formed to have a size of mm. Further, in the rib portion 6, the thickness (t ₂ ) was set to 2.4 mm, while the groove-shaped recess 12 was formed in the central portion so that the rib portion thickness was 1.8 mm. Furthermore, the base 8
In the above, the radii of curvature R ₁ and R ₃ between the upper and lower face plate portions 2 and 4 and the rib portion 6 are set to 4 mm, and
Lower surface plate curvature between the ribs 6, 6 of the base portion 8 of 4 radius: the R ₂ without a 6 mm, also the curvature between the ribs 6, 6 of the base portion 8 of the upper surface plate portion 2 radius: R ₂ was 8 mm.

Then, two of the obtained aluminum alloy profiles were joined in the width direction, and a sample of 400 mm × 400 mm was cut out from the obtained joined body, and its sound insulation characteristics were evaluated. .

On the other hand, for comparison, the above-mentioned groove-shaped recess 1
2 and the protrusion 14 are not provided, and the radius of curvature is:
Each of R ₁ , R ₂ and R ₃ was reduced by 2 mm to obtain an aluminum alloy profile having a reduced cross-sectional area of the root portion 8 by extrusion, and samples were cut out from the two in the same manner as described above. , And similar sound insulation characteristics were evaluated.

FIG. 8 shows the evaluation results of the sound insulation characteristics obtained for these two samples.
As is clear from the results of the above, in the aluminum alloy profile according to the present invention, the sound transmission loss is large, and therefore,
It is understood that the sound insulation properties are excellent.

The specific construction of the present invention has been described in detail above with reference to specific examples and examples. However, the present invention should be construed as being limited to the above specific description and examples. However, the present invention can be carried out in variously modified, modified, improved, etc. modes based on the knowledge of those skilled in the art, and such modes of implementation do not depart from the spirit of the present invention. It is to be understood that, as long as they are within the scope of the present invention.

The term "and / or" used in the present specification is, as is well known,
Corresponding to "and / or", for example, in the case of "face plate part and / or rib part", there are three cases of "face plate part", "rib part" and "face plate part and rib part". It is used as a phrase that represents.

[0037]

As is apparent from the above description, in the aluminum alloy profile for a railway vehicle having the structure according to the present invention, there is no application of a new damping material and the increase of weight,
By changing only the cross-sectional shape of the profile itself, it is possible to improve the sound insulation characteristics, and therefore, the use of such profile is not a constraint for reducing the weight of railway vehicles, In addition, since it is possible to improve the sound insulation characteristics only by changing the cross-sectional shape of the aluminum alloy profile, there is no need for a new manufacturing process, and it is possible to exert features such as no increase in manufacturing cost. Becomes

Even if the above-mentioned effect is used together with the conventionally adopted measures for improving the sound insulation characteristics, there is no interference, and further improvement of the characteristics can be expected.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of an aluminum alloy profile for a railway vehicle to which the present invention is applied.

FIG. 2 is an explanatory view showing an example in which the present invention is applied to each part of the aluminum alloy profile shown in FIG.
(A), (b), (c), (d) and (e) show examples in which the present invention is applied to the A, B, C, D and E sites in FIG. 1, respectively.

FIG. 3 is a graph showing the relationship between plate thickness ratio and transmission loss.

FIG. 4 is a graph showing the relationship between acoustic impedance ratio and transmission loss.

FIG. 5 is a cross-sectional explanatory view showing an example of an aluminum alloy profile for a railway vehicle according to the present invention.

FIG. 6 is a cross-sectional explanatory view showing another example of the aluminum alloy profile for a railway vehicle according to the present invention.

FIG. 7 is a partial cross-sectional explanatory view showing still another example of the aluminum alloy profile for a railway vehicle according to the present invention.

FIG. 8 is a graph showing the sound insulation characteristic results obtained in the examples.

[Explanation of symbols]

 2, 4, 16 Face plate portion 6, 18 Rib portion 8, 20 Root portion 10 Internal space 12 Groove-shaped concave portion 14 Projection portion

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hidenori Ito 5-11-3 Shimbashi, Minato-ku, Tokyo Sumitomo Light Metal Industries, Ltd. (72) Inventor Hironori Akiyama No. 1 Sanbonmatsucho, Atsuta-ku, Nagoya-shi, Aichi No. 1 in Japan Vehicle Manufacturing Co., Ltd. (72) Inventor Hiroaki No. 1-1 Sanbonmatsucho, Atsuta-ku, Nagoya-shi, Aichi Japan Vehicle Manufacturing Co., Ltd. (72) Inventor Takuo Kusano 2-chome, Higashi-Shinagawa, Shinagawa-ku, Tokyo No. 20 Japan Light Metal Co., Ltd.

Claims (7)

[Claims] 1. Aluminum for a railroad vehicle, which has a flat plate-shaped face plate portion obtained by extruding an aluminum alloy and a rib portion integrally rising and extending in a direction separating from one surface of the face plate portion. Formed into an alloy shape, and in the direction of vibration or sound propagation, the face plate and / or
Alternatively, the thickness of the rib portion is changed so as to be 1.3 times or more at a change rate from a thin portion to a thick portion, and the thickness changing portion is provided at two places in the vibration or sound propagation direction. An aluminum alloy profile for railway vehicles, characterized by being provided as above. 2. A railroad vehicle aluminum having a flat plate-shaped face plate portion obtained by extrusion processing of an aluminum alloy and a rib portion integrally rising and extending in a direction separating from one surface of the face plate portion. An alloy profile is used to increase the effective thickness of the root portion to which the rib portion is connected to the face plate portion, with respect to the face plate portion and / or the rib portion, and the root portion is effective with respect to the face plate portion. The thickness is 1.5 times or more the thickness of the face plate portion, while the effective thickness of the root portion with respect to the rib portion is 2.0 times the thickness of the rib portion. An aluminum alloy profile for a railway vehicle, which is configured as described above. 3. A railroad vehicle aluminum having a flat plate-shaped face plate portion obtained by extrusion of an aluminum alloy and a rib portion integrally rising and extending in a direction away from one surface of the face plate portion. Formed into an alloy shape, and in the direction of vibration or sound propagation, the face plate and / or
Alternatively, the thickness of the rib portion is changed so as to be 1.3 times or more at a change rate from a thin portion to a thick portion, and the thickness changing portion is provided at two places in the vibration or sound propagation direction. In addition to providing the above, the effective thickness of the root portion to which the rib portion is connected to the face plate portion is increased with respect to the face plate portion and / or the rib portion, and the effective thickness of the root portion with respect to the face plate portion is increased. In the above, the thickness of the face plate portion is 1.5 times or more, while the effective thickness of the root portion with respect to the rib portion is 2.0 times or more the thickness of the rib portion. An aluminum alloy profile for railway vehicles, characterized by being configured as follows. 4. The thickness changing portion of the face plate portion and / or the rib portion is a central portion of a portion located between adjacent rib portions in a face plate portion having a plurality of the rib portions, or the rib portion. The aluminum alloy profile for a railway vehicle according to claim 1 or 3, wherein the aluminum alloy profile is formed by a groove-shaped recess provided in a central portion of the. 5. A portion where a thickness change portion of the face plate portion and / or the rib portion is close to the root portion of the face plate portion,
Alternatively, the aluminum alloy profile for a railway vehicle according to claim 1 or 3, which is configured by a protrusion provided in a portion of the rib portion close to the root portion. 6. The thickness changing portion of the face plate portion and / or the rib portion is a central portion of a portion located between adjacent rib portions in a face plate portion provided with a plurality of the rib portions, or the rib portion. 1 or claim 2, which is configured by a groove-shaped recess provided in the central portion of the face plate and a protrusion provided in a portion of the face plate portion near the root portion or in a portion of the rib portion near the root portion. Item 3. The aluminum alloy profile for railway vehicles according to Item 3. 7. The aluminum extruded profile is a hollow extruded profile including two of the face plate portions and a plurality of rib portions connecting the two face plate portions. The aluminum alloy profile for a railway vehicle according to any one of claims.