JP2003220477A - Rail vehicles and hollow profiles - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a two-face structural body having high strength and practicality. <P>SOLUTION: Board thickness increase parts 14 (34) are provided in the inner faces of face boards 11 (31) of hollow members 10 (30). Board thickness increase parts 16 (36) are provided in the outer faces of the end parts of face boards 12 (32) and board thickness increase parts 15 (35) are provided in the inner faces thereof. Inclined faces 21 (41) are provided in the inner faces of the face boards 11 (31) on the far sides from the end parts of the face boards 11 (31) from connection parts of the face boards 11 (31) and connection boards 13A (33A). The board thickness increase parts 15, 16, (35, 36) and the face boards 12 (32) are connected with inclined faces 22, 23 (42, 43). The face boards 11, 31 and the face boards 12, 32 are butted to each other, and the friction stir welding is conducted. According to this, when the tensile load in the right angle direction acts on a join line to which a friction stir welding is applied, bending stress in the vicinity of a join part of the face boards 12, 32 is hardly generated, and the bending stress in the vicinity of a join part of the face boards 11, 31 is greatly reduced. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a two-sided structure joined by friction stir welding. For example,
It is suitable for a two-sided structure that constitutes a railroad vehicle or a building made of an aluminum alloy.

[0002]

2. Description of the Related Art In the friction stir welding method, a round bar (referred to as a rotary tool) inserted into a joint is rotated and moved along a joint line to heat the joint, soften it, and cause it to plastically flow to solid-phase. It is a method of joining. The rotary tool includes a small diameter portion to be inserted into the joint and a large diameter portion located outside. The small diameter portion and the large diameter portion are coaxial. The boundary between the small diameter portion and the large diameter portion is slightly inserted in the joint portion. This is the special table 07-505
090 (EP0615480B1).

[0003]

Generally, when the members are friction stir welded, the strength in the vicinity of the welded parts decreases due to the effect of frictional heat generated between the rotary tool and the members. For this reason, when a load is applied to the structure manufactured using friction stir welding, the strength of the base material part that is not affected by frictional heat is sufficient, but near the joint part where the strength is reduced,
The structure may be easily destroyed.

A means for preventing the destruction of the structure near such a joint is disclosed in JP-A-11-254155. This is to increase the plate thickness in the vicinity of the joint and to improve the strength in the vicinity of the joint depending on the difference in hardness between the vicinity of the joint and the base material.

The hollow profile shown in FIGS. 5 and 6 of JP-A-11-254155 will be examined. There is a connecting plate that connects two face plates to the end of the hollow frame. This part is friction stir welded to the other hollow member. The plate thickness is increased only in the inward direction of the face plate near the joint. In this case, when a tensile load in a direction perpendicular to the joining line (width direction in FIGS. 5 and 6) is applied, a large bending deformation occurs near the joining portion, and due to the excessive bending stress generated,
The two-sided structure may be easily broken in the vicinity of the joint where the strength is reduced.

Therefore, it is possible to increase the plate thickness of the face plate in the vicinity of the joint with the center axis of the plate thickness of the face plate as the axis of symmetry without providing the connecting plate at the joint. According to this, even when a tensile load in a direction perpendicular to the joining line is applied to the two-sided structure, almost no bending deformation occurs in the vicinity of the joining portion. However, in a two-sided structure that constitutes a railway vehicle, a building, or the like, it is considered that it is not preferable in terms of designability and safety that unevenness is generated on the outer surface of the face plate that is exposed to the appearance.

An object of the present invention is to provide a two-sided structure having high strength and high practicality.

[0008]

The above object is to perform friction stir welding on the abutting portions of the two face plates of the first hollow frame member and the two face plates of the second hollow frame member, respectively. Each of the first hollow section and the second hollow section,
A first face plate, a second face plate that is substantially parallel to the first face plate, and a connecting plate that connects the first face plate and the second face plate.
A first connecting portion between the connecting plate and the first face plate at one end of the hollow frame, and the connecting plate and the first connecting plate at the one end of the second hollow frame. A third connecting portion between the second connecting plate and the second connecting plate at one end of the first hollow section, and the friction stir welding part is provided between the connecting plate and the second connecting part. And the friction stir welding part is provided between the connection plate at the one end of the second hollow section and the fourth connection part between the second face plate and the first connection. An outer surface of each of the first face plates from the portion to the second connection part is substantially flush with a face plate in the vicinity thereof, and
The inner surface of each of the first face plates from the connection part to the second connection part is thicker inward than the face plate in the vicinity thereof, and the thickened part is separated from the friction stir welding part. Therefore, it becomes thinner toward the first face plate, and each of the second face plates from the third connection portion to the fourth connection portion is thickened by projecting toward both sides thereof, The thickened portion becomes thinner toward the second face plate as the distance from the friction stir welding portion increases, and the first face plate is located outside the vehicle.
Can be achieved by

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a state where one face plate of the hollow shape member is friction stir welded. FIG. 2 shows a state in which after one face plate is friction stir welded, the hollow shape member is inverted and the other face plate is friction stir welded.

The vehicle body 100 includes an underframe 101 forming a floor,
The roof structure 102 constitutes a roof, the side structure 103 constitutes a side surface, and the end structure 104 constitutes an end portion in the longitudinal direction. The underframe 101, the roof structure 102, and the side structure 103 are manufactured by joining a plurality of extruded profiles. The longitudinal direction of the extruded profile corresponds to the longitudinal direction of the vehicle body. The extruded profile is made of aluminum alloy.

Hollow frame members 10 and 3 forming the side structure 103.
The configuration around the joint portion of No. 0 and the joining method will be described.

The hollow frame member 10 (30) is composed of two face plates 1
1, 12 (31, 32) and a plurality of connecting plates 13 (33) arranged in a truss shape. Two face plates 11, 12 (3
1, 32) are substantially parallel. Connection plate 13 (3
The pitch of 3) is the same except for the connecting plate 13A (33A). The face plates 11, 12, 31, 32 have the same plate thickness. The connection plates 13 and 33 have the same plate thickness. Connection plate 13
The plate thicknesses of A and 33A are the same. The structure is manufactured by joining the end portions of the face plates 11 and 31 and the end portions of the face plates 12 and 32.

The positions of the end faces of the two face plates 11, 12 (31, 32) in the direction perpendicular to the extruding direction (vertical direction in FIG. 1) are:
Substantially match. Face plate 11 (31) and connection plate 13A
The connecting portion of (33A) includes a face plate 12 (32) and a connecting plate 13
It is located closer to the end of the hollow frame member 10 (30) than the connecting portion of A (33A). Therefore, from the connecting portion between the face plate 11 (31) and the connecting plate 13A (33A) to the face plate 11 (31)
The length of the face plate 11 (31) up to the end of the face plate 12 (3
2) to the connecting plate 13A (33A) to the face plate 12
It is shorter than the length of the face plate 11 (31) up to the end of (32).

On the outer surface of the end portion of the face plate 11 (31) (the outer surface in the thickness direction of the hollow shape member), a convex portion 18 (3) projecting in the same direction.
There is 8). The inner surface (the inner surface in the thickness direction of the hollow shape member) has a plate thickness increasing portion 14 (34) and a convex portion 17 (37). The outer surface of the face plate 11 (31) excluding the convex portion 18 (38) is flat. The plate thickness increasing portion 14 (34) continuously increases in thickness from the end of the face plate 11 (31) to the connecting plate 13A (33A). The convex portion 17 (37) is located at the end of the face plate 11 (31). The convex portion 17 (37) is formed by the plate thickness increasing portion 14 (3
4) to the center side of the hollow profile (face plate 12, 32 side)
Overhangs.

There is a plate thickness increasing portion 15 (35) and a convex portion 19 (39) on the inner surface of the end portion of the face plate 12 (32), and a plate thickness increasing portion 16 (36) and a convex portion 20 (40) on the outer surface. ). The thickness of the plate thickness increasing portion 15 (35) and the plate thickness increasing portion 16 (36)
Is equal to the thickness of. Face plate 12 (3) in which face plate 12 (32) and plate thickness increasing portions 15, 16 (35, 36) are combined
2) Maximum thickness (excluding protrusions 19, 39, 20, 40)
Is the thickness of the face plate 11 (31) including the face plate 11 (31) and the plate thickness increasing portion 14 (34) (the convex portions 17, 37, 18,
(Excluding 38).

The convex portions 19 and 20 (39 and 40) are face plates 12.
At the end of (32). The convex portion 19 (39) is further inside the hollow shape member (face plates 11, 3) from the plate thickness increasing portion 15 (35).
1 side). The convex portion 20 (40) further projects from the plate thickness increasing portion 16 (36) to the outside of the hollow frame member.

From the ends of the convex portions 19, 20 (39, 49) toward the vicinity of the connecting plate 13A (33A), the plate thickness increasing portion 1
The thickness of 5, 16 (35, 36) is gradually reduced (becomes slopes 22, 23, 42, 43). The normal face plate 12 is provided near the middle of the connecting portion between the connection plate 13A (33A) and the face plate 12 (32) and the end of the face plate 12 (32).
The plate thickness is (32). Slopes 22, 23, 42,
The height of 43 is equivalent.

Protrusions 17, 18, 19, 20, 37, 3
The heights and widths of 8, 39 and 40 are the same.

On the end faces of the face plates 11, 12, 31, 32,
There is a fitting portion for fitting the other face plate. There are recesses 44 and 45 at the ends of the face plates 31 and 32.
Convex portions 24 and 2 that enter concave portions 44 and 45 at the end portions of 1 and 12
There is 5. The recesses 44 and 45 have the same width and depth. The protrusions 24 and 25 have the same width and height. As a result, the centers of the plate thicknesses of the face plates 11 and 31 coincide with each other. The centers of the plate thicknesses of the face plates 12 and 32 coincide with each other.

The face plate 11 (31) and the connecting plate 13A (33)
Connection plate 13 (33) side of the connection portion of A), that is, face plate 1
An inclined plate thickness increasing portion (slope portion) 21 (41) is provided on the inner surface of the face plate 11 (31) on the side far from the end of 1 (31). The slope 21 (41) is gradually thinned toward the farther side. The slopes 21 and 41 have the same width and height.

The joining procedure will be described. The hollow shape members 10 and 30 are placed on the bed 50 with the surfaces on the side of the face plates 12 and 32 facing downward. The bed 50 is flat. The ends of the hollow shape members 10 and 30 are butted, and the convex portions 24 and 25 are inserted into the concave portions 44 and 45 and fitted together. In this state, the hollow frame members 10 and 3
0 is firmly fixed to the bed 50. The plate thickness centers of the face plates 11 and 31 substantially coincide with each other. The plate thickness centers of the face plates 12 and 32 substantially coincide with each other. Also, the face plates 11, 3
The butt joints of No. 1 are temporarily welded at predetermined intervals.

Next, the abutting portions of the face plates 11 and 31 are friction stir welded. The bobbin type rotary tool 60 is inserted into the abutting portions 24 and 44, moved along the joining line, and friction stir welding is performed. The bobbin type rotary tool 60 includes a small diameter portion 61 and large diameter portions 62 and 63 at both ends thereof. The small diameter portion 61 and the large diameter portions 62 and 63 are coaxial. At the upper end of the large diameter portion 62, there is a drive device for rotating.

The direction of the axis of the bobbin type rotary tool 60 is the vertical direction. However, as is known, the bobbin type rotary tool 60 is slightly inclined rearward with respect to the joining direction. The lower end of the large diameter portion 62 has the tops of the convex portions 18, 38 and the face plates 11, 3
1 and the outer surface thereof. The upper end of the large diameter portion 63 is located between the inner surface of the plate thickness increasing portions 14 and 34 and the tops of the convex portions 17 and 37. By this friction stir welding, the gaps between the abutting portions of the face plate 11 and the face plate 31 become convex portions 17, 18, 3
Face plates 11, 31 filled with 7, 38 metal
Are joined. The large diameter portions 62, 63 form concave portions on the convex portions 17, 18, 37, 38, and burrs are generated.

After this, the convex portion 1 of the face plates 11 and 31 on the outer side of the vehicle
8 and 38 are cut with a grinder or the like to make them smooth like the outer surfaces of the face plates 11 and 31. The outer surfaces of the face plates 11 and 31 are the outer surface of the side structure 103, that is, the outer surface of the vehicle that requires a smooth surface. The cutting work may be performed after the friction stir welding of the abutting portions of the face plates 12 and 32.

Next, the joined structure (hollow frame members 10, 3)
0) is reversed, and the face plates 11 and 31 are placed on the bed 50 with the faces thereof facing downward. The hollow members 10 and 30 are firmly fixed to the bed 50. Further, the butted portions of the face plates 11 and 31 are temporarily fixed and welded at predetermined intervals.

Next, the abutting portions of the face plates 12 and 32 are friction stir welded. The bobbin type rotary tool 60 is inserted into the butt portion and moved along the joining line. The lower end of the large-diameter portion 62 has the outer surface side of the plate thickness increasing portions 16 and 36 and the convex portions 20 and 40.
Located between the top of the. The upper end of the large diameter portion 63 is located between the inner surface side of the plate thickness increasing portions 15 and 35 and the tops of the convex portions 19 and 39. By this friction stir welding, the gaps between the abutting portions of the face plate 12 and the face plate 32 become convex portions 19, 20, 3
Face plates 12, 32 filled with 9, 40 metal
Are joined. The large diameter portions 62 and 63 form concave portions on the convex portions 19, 20, 39 and 40, and burrs are generated.

Consider a case where a tensile load is applied in the width direction of the two-sided structure manufactured by the above method (the width direction of the hollow shape member, the horizontal direction in FIG. 1). It is desirable to increase the plate thickness near the FSW joint. In this case, we want to make it thicker on both sides of the board.
Therefore, the face plates 12 and 32 on the inside of the vehicle are thickened on both sides. Since the joints of the face plates 12 and 32 are thickened on both sides of the plate, the central axes of the plates are on the extension lines of the central axes of the face plates 12 and 32 in the vicinity thereof. Therefore, there is no difference in rigidity in the plate thickness direction and almost no bending stress occurs.

On the other hand, since the outside of the vehicle is desired to be smooth, the face plate 1
It is thickened inside 1, 31. The outer side of the vehicle is thicker inward, but the distance between the connecting portions of the face plates 11 and 31 and the connecting plates 13A and 33A is small, so the weight can be reduced.

Further, since the inclined portions 21 and 41 are provided at the ends of the plate thickness increasing portions 14 and 34, the central axes of the plates in these portions gradually approach the central axes of the plates of the face plates 11 and 31, respectively. Inclined portion 21,
Since 41 is on the other end side of the connection plates 13A and 31A,
The thinned portions of the face plates 11 and 31 (face plates 11, 3
Since the stress concentration does not occur in the portion having the plate thickness 1), the difference in rigidity in the plate thickness direction becomes small, and the occurrence of bending stress is greatly reduced.

The inclined portions 21 and 41 are connected plates 13A and 31A.
If it is closer to the FSW joint than the connecting plates 13A and 33A, the connecting plates 13A and 33A are connected to the thinned portions of the face plates 11 and 31 at the ends of the inclined portions 21 and 41. Undesirable stress concentration. But as mentioned above,
This can be prevented by providing the inclined portions 21 and 41 on the other end side of the connection plates 13A and 33A.

Therefore, the face plates 12 and 32, and the face plate 1
It is possible to significantly reduce the stress generated in the vicinity of the joint portions 1 and 31 and to withstand a high tensile load. Further, since the outer surfaces of the face plates 11 and 31 in the vicinity of the joint are finished smoothly, they can be used on the outside of the vehicle.

In the above embodiment, the connection plates 13A and 33A are inclined with respect to the face plates 11 and 31, but the face plates 11 and 3 are not shown.
It may be substantially orthogonal to 1.

Incidentally, the connection plates 13A, 3 on the side with a small interval
The interval of 3 A is made larger than the range of the heat affected zone by friction stir welding.

The technical scope of the present invention is not limited to the wording described in each claim of the claims or the wording described in the section of means for solving the problem, and can be easily replaced by those skilled in the art. It extends to a range.

[0035]

According to the present invention, the stress generated in the vicinity of the joint can be reduced even when a tensile load in the direction perpendicular to the joint line is applied.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of the periphery of a joining portion at the time of joining according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of the periphery of a joint portion when joining according to an embodiment of the present invention.

FIG. 3 is a vertical cross-sectional view of the periphery of a joint after joining according to an embodiment of the present invention.

FIG. 4 is a perspective view of a vehicle body of a railway vehicle.

[Explanation of symbols]

10, 30: Hollow shape members, 11, 11b, 12, 12b,
31, 31b, 32, 32b: Face plate, 13, 33: Connection plate, 14, 15, 16, 34, 35, 36: Plate thickness increasing portion, 17, 18, 19, 20, 37, 38, 39, 4
0: convex part, 21, 22, 23, 41, 42, 43: taper, 24, 25, 44, 45: fitting part, 50: bed,
60: bobbin type rotary tool, 61: small diameter part, 62, 63:
Large diameter part, 100: vehicle body, 101: underframe, 102: roof structure, 103: side structure, 104: wife structure

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masaaki Shigeyama             Yamaguchi Prefecture Kudamatsu City Oita Toyoi 794 Stock Association             Inside Hitachi Kasado Works (72) Inventor Satsun             4-6 Kanda Surugadai, Chiyoda-ku, Tokyo             Within Hitachi, Ltd. F-term (reference) 4E067 DA13 DA17

Claims (14)

[Claims] 1. The abutting portions of the two face plates of the first hollow shape member and the two face plates of the second hollow shape member are friction stir welded together, and the first hollow shape member and Each of the second hollow frame members comprises a first face plate, a second face plate substantially parallel to the first face plate, and a connecting plate connecting the two, and the first hollow A first connecting portion between the connecting plate and the first face plate at one end of the shape member, the connecting plate and the first face plate at the one end of the second hollow shape member, The second connection part of the, and the friction stir welding part between, the third connection part of the connection plate and the second face plate of one end of the first hollow profile, The friction stir welding part is provided between the connection plate at the one end of the second hollow shape member and the fourth connection part of the second face plate, and the first connection Wherein from up to the second connecting portion first
The outer surface of each of the face plates is substantially flush with the face plate in the vicinity thereof, and the first connecting portion extends from the first connecting portion to the second connecting portion.
The inner surface of each of the face plates is thicker inward than the face plate in the vicinity thereof, and the thickened portion becomes thinner toward the first face plate as the distance from the friction stir welding portion increases, The second from the third connecting portion to the fourth connecting portion
Each of the face plates is thicker so as to project toward both sides thereof, and the thickened portion becomes thinner toward the second face plate as the distance from the friction stir welding portion increases, A railroad vehicle characterized in that the face plate is on the outside of the vehicle. 2. The railway vehicle according to claim 1, wherein the first vehicle
The railroad vehicle, wherein the connecting portion, the second connecting portion, the third connecting portion, and the fourth connecting portion are outside the heat-affected portion of the friction stir welding portion. 3. The railroad vehicle according to claim 1, wherein each of the thinned portions is thinned on the opposite side of the friction stir welding portion with respect to the connection portion between the connection plate and the face plate. A railroad vehicle characterized by: 4. The railway vehicle according to claim 1, wherein the first vehicle
2. The railroad vehicle according to claim 1, wherein the connection plates on both sides of the friction stir welding part for joining the face plates are inclined toward the friction stir welding part. 5. The railroad vehicle according to claim 4, wherein each of the thinned portions is thinned on the opposite side of the friction stir welding portion with respect to the connection portion between the connection plate and the face plate. A railroad vehicle characterized by: 6. The abutting portions of the two face plates of the first hollow frame member and the two face plates of the second hollow frame member are friction stir welded together, and the first hollow frame member and Each of the second hollow frame members comprises a first face plate, a second face plate substantially parallel to the first face plate, and a connecting plate connecting the two, and the first hollow A first connecting portion between the connecting plate and the first face plate at one end of the shape member, the connecting plate and the first face plate at the one end of the second hollow shape member, The second connection part of the, and the friction stir welding part between, the third connection part of the connection plate and the second face plate of one end of the first hollow profile, The friction stir welding part is provided between the connection plate at the one end of the second hollow shape member and the fourth connection part of the second face plate, and the first connection Wherein from up to the second connecting portion first
The outer surface of each of the face plates is substantially flush with the face plate in the vicinity thereof, and the first connecting portion extends from the first connecting portion to the second connecting portion.
The inner surface of each of the face plates is thicker inward than the face plate in the vicinity thereof, and the thickened portion becomes thinner toward the first face plate as the distance from the friction stir welding portion increases, The second from the third connecting portion to the fourth connecting portion
Each of the face plates is thicker so as to project toward both sides thereof, and the thickened portion becomes thinner toward the second face plate as the distance from the friction stir welding portion increases. The structure to do. 7. The structure according to claim 6, wherein the first connecting portion, the second connecting portion, the third connecting portion, and the fourth connecting portion are heat-affected by the friction stir welding portion. A structure characterized by being outside the part. 8. The structure according to claim 6, wherein each portion where the thickened portion is thinned is thinned on the opposite side of the friction stir welding portion with reference to the connection portion between the connection plate and the face plate. A structure characterized by: 9. The structure according to claim 6, wherein the connection plates on both sides of the friction stir welding part for joining the first face plate are inclined toward the friction stir welding part. Structure. 10. The structure according to claim 9, wherein each portion where the thickened portion is thinned is thinned on the opposite side of the friction stir welding portion with respect to the connection portion between the connection plate and the face plate. A structure characterized by: 11. A hollow shape member comprising a first face plate, a second face plate, and a connecting plate connecting the two, wherein the end portion of the face plate is a portion for friction stir welding. An outer surface of the first face plate from a first connecting portion between the face plate and the connection plate to the end portion of the first face plate is substantially on the same plane as the first face plate in the vicinity thereof, The inner surface of the face plate from the first connecting portion to the end portion of the first face plate is thicker inward than the face plate in the vicinity thereof, and the thickened portion is separated from the friction stir welding part. Therefore, it becomes thinner toward the first face plate, and the second face plate from the second connecting portion between the second face plate and the connecting plate to the end portion of the second face plate is It is thickened by protruding toward both sides, and the thickened part is the friction stir welding part. The hollow shaped member is characterized in that it becomes thinner toward the second face plate as the distance from the hollow face increases. 12. The hollow profile member according to claim 11, wherein each portion where the thickened portion is thinned is thinned on a side opposite to the end portion with respect to a connection portion between the connection plate and the face plate. Hollow profile characterized by being 13. The hollow frame member according to claim 11, wherein the connecting plate is inclined toward the end portion of the first face plate. 14. The hollow profile member according to claim 13, wherein each of the thinned portions is thinned on the opposite side of the end portion with respect to the connection portion between the connection plate and the face plate. Hollow profile characterized by being