JP2001233208A - Bogie for railway rolling stock and manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce stress concentration and residual stress generated in a joining part of side beams and a horizontal beam for vertial, lateral and longitudinal directional loads applied to a bogie frame. SOLUTION: This bogie is composed of an upper frame 1a and a lower frame 1b having an integrally press-molded U-shaped groove-like cross section having a curved surface shape of a radius of curvature R in a connecting part of both side beams and the horizontal beam of the bogie frame. A butting plate 3 is inserted into a space of the upper frame 1a and the lower frame 1b to be frictionally agitated and joined from an outside surface. Afterwards, the butting plate is extracted, and a blocking-up plate is welded to an opening.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bogie for a railway vehicle, and more particularly to a bogie structure for a railway vehicle suitable for joining an upper frame and a lower frame in which both side beams and cross beams of a bogie frame are integrally formed. is there.

[0002]

2. Description of the Related Art As a conventional bogie for a railway vehicle, Japanese Unexamined Patent Publication No.
As shown in -56232, steel plate is used as a material,
The side beam is formed by welding a plurality of flat plates or groove-shaped bent plates, and the cross beam is made of steel pipe or the like. It is customary to make the side beam penetrate the cross beam and to assemble into a substantially H shape and integrate them.

[0003]

In such a configuration, since a load acts on the bogie frame in the up-down direction, the left-right direction, and the front-back direction, a large stress, which is a problem in strength, is applied to the joint between the side beam and the cross beam. Likely to happen. In the related art, since the penetrating portions of the side beams and the cross beams are joined by welding or press-fitting, there is a possibility of a problem in strength.

[0004] It is an object of the present invention to improve the strength reliability in joining a side beam and a cross beam.

[0005]

The object of the present invention is to provide a double-sided beam,
An upper frame formed of a cross beam connecting the both side beams is formed by pressing, and the upper frame and the lower frame are abutted with each other. , And then the friction stir welding is performed, and the backing plate is removed.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a bogie for a railway vehicle according to the present invention will be described with reference to FIGS. 10a is an upper frame which forms a bogie frame, and 10b is a lower frame. 10
In a, a side beam 1a and a horizontal beam 2a are integrally formed into a U-shaped groove-shaped cross-sectional structure by press working. The lower frame 10b is integrally formed in the same manner as the upper frame 10a. Since the upper frame 10a and the lower frame 10b are integrally formed by pressing, the side beam 1a and the side beam 2a or the side beam 1b and the side beam 2b are formed.
Is formed with a radius of curvature R.

The upper frame 10a and the lower frame 10b, which are integrally formed, are joined by friction stir welding. The contact plate 3 penetrates through the inside of the side beams 1a and 1b to support the pressing force F of the friction stir welding. The backing plate 3 is located on the back surface of the butted portion of the upper and lower frames 10a and 10b. The friction stir welding device 4 moves the tool 4 along the joining line between the upper frame 1a and the lower frame 1b in a state where the tool 4 is inserted from the side surface into the butted portion of the upper frame 1a and the lower frame 1b of the side beam, and friction stir welding is performed. I do. The axis of the tool 4 at this time is in the horizontal direction.

When the joining of the side beams is completed, the backing plate 3 is removed. Similarly, the upper frame 2a and the lower frame 2b of the cross beam are joined by friction stir welding.

After joining in this manner, a closing plate is applied to the opening at the end of the side beam and the opening at the end of the cross beam through which the backing plate 3 has penetrated, and arc welding is performed.

In FIG. 4, auxiliary plates 20a and 20b are arranged on the side surface of the backing plate 3 so as to have a gap between the auxiliary plate 20a and the tool 4.

FIG. 5 is a sectional view showing a state where the concave portion 2
1 is provided.

In such a configuration, the side beams 1a, 1b and the horizontal beams 2a, 2 are subjected to friction stir welding from the direction of the mark F at the joint between the upper frame 10a and the lower frame 10b.
b can be joined. Further, the side beams 1a and 1b and the horizontal beams 2
Since the joints a and 2b are pressed with a radius of curvature R, stress concentration can be reduced. For this reason, the strength reliability of the joint between the both-side beams 1a and 1b and the cross beams 2a and 2b can be improved. Here, the radius of curvature R is about 100 mm. The upper frame 10a and the lower frame 10b
May have the same cross-sectional shape.

The embodiment shown in FIG. 6 will be described. In the pretreatment stage of joining, the shape of the butted portions 5a and 5b of the upper frame 1a and the lower frame 1b is machined into an uneven shape, and after the machining, the upper frame 1a and the lower frame 1b are combined, It was joined by friction stir welding.

As a result, the assembling of the upper frame 1a and the lower frame 1b at the time of abutting is easy and accurate, so that the working time required for joining can be shortened.

The embodiment shown in FIG. 7 will be described. The integrally formed up-and-down butt portions 7a and 7b are provided with irregularities, and the upper frame 10 is formed by friction stir welding from the side.
a and the lower frame 10b. Next, the recess is covered with a joint 4a, and this is joined by friction stir welding.

According to this, the insertion depth of the tool can be reduced, and the joining can be easily performed.

The embodiment shown in FIGS. 8 and 9 will be described.
As shown in FIG. 9, the inner reinforcing plate 8 is provided in the lower frame 1b and the upper frame 1a.
a or 8b is welded in the pretreatment stage. The internal reinforcing plate 9 has a shape with four corners, and is arranged inside the butted portion of the upper frame 1a and the lower frame 1b. Thereafter, the upper frame 1a and the frame 1b are joined by friction stir welding without using a backing plate.

In such a configuration, the inner beams 9a and 1b and the side beams 2a and 1b serve the role equivalent to the above-mentioned backing plate in a form in which the internal reinforcing plate 9 arranges the internal reinforcement of the upper frame 1a and the lower frame 1b.
The strength reliability of a and 2b is improved.

As a matter of course, as an alternative to the friction stir welding shown in FIGS. 6 to 8, the upper frame and the lower frame may be assembled by welding a conventional MIG or the like to assemble the bogie frame. . As a matter of course, the backing plate 3 may not be provided.

[0020]

As described above, according to the present invention, the bogie frame has a radius of curvature for reducing the concentration of stress generated at the joint between the side beam and the cross beam by integrally forming the both beam and the cross beam. R
Is formed. Further, the butted portion of the upper frame and the lower frame is provided with an uneven shape, so that the accuracy in assembling can be improved and the strength reliability of the joined portion due to friction stir welding can be improved, and the working time can be shortened.
Furthermore, since the unevenness of the joining portion is reduced, a bogie frame having a good appearance can be formed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment according to the present invention.

FIG. 2 is a longitudinal sectional view of a side beam of FIG. 1;

FIG. 3 is a side view of the side beam of FIG. 1;

FIG. 4 is a cross-sectional view illustrating an embodiment of a backing plate by friction stir welding according to the present invention.

FIG. 5 is a cross-sectional view showing another embodiment of the backing plate by friction stir welding of the present invention.

FIG. 6 is a longitudinal sectional view of a side beam showing another embodiment according to the present invention.

FIG. 7 is a longitudinal sectional view of a side beam showing another embodiment according to the present invention.

FIG. 8 is a perspective view of a lower frame showing another embodiment according to the present invention.

FIG. 9 is a longitudinal sectional view of the side beam of FIG. 8;

[Explanation of symbols]

 1a: upper frame, 1b: formed frame, 3: backing plate.

Continued on the front page (72) Inventor Motomi Hiraishi 794, Higashi-Toyoi, Kazamatsu, Kamamatsu, Yamaguchi Prefecture Inside the Kasado Works of Hitachi, Ltd. Inside the Kasado Works of the Works (72) Inventor Shigeru Noguchi 794, Higashi-Toyoi, Oaza, Kudamatsu-shi, Yamaguchi Prefecture F-term in the Kasado Works of Hitachi, Ltd.

Claims (6)

[Claims] 1. A bogie frame for a railway vehicle comprising a beam on both sides and a cross beam connecting the both beams, wherein the bogie frame integrally forms the side beam and the cross beam with a U-shaped groove-shaped cross section. A bogie for a railway vehicle, comprising an upper frame and a lower frame, wherein the upper frame and the lower frame are formed by friction stir welding. 2. The bogie for a railway vehicle according to claim 1, wherein closing plates are welded to the longitudinal ends of the side beams and the longitudinal direction of the cross beams, respectively. 3. The bogie for a railway vehicle according to claim 1, wherein a contact plate is disposed at the butting portion inside the bogie frame at a butting portion between the upper frame and the lower frame. A bogie for railway vehicles. 4. The bogie for a railway vehicle according to claim 1, wherein internal reinforcement is arranged on said upper frame and said lower frame. 5. A space comprising an upper frame and a lower frame, which is formed by pressing a frame as an upper frame composed of both side beams and a horizontal beam connecting the both side beams, and butting the upper frame and the lower frame. A method for manufacturing a bogie for a railway vehicle, comprising: performing friction stir welding from the outside with a backing plate inserted into the vehicle, and removing the backing plate. 6. A method for manufacturing a bogie for a railway vehicle according to claim 5, wherein a blocking plate is welded to each of longitudinal ends of the side beam and the cross beam.