JP2002160076A - Manufacturing method for structural body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structural body which has high strength. SOLUTION: Projections 11 and 21 are provided on one side faces of the end parts of plate materials 10 and 20, and projections 12 and 22 are provided on the other side faces thereof. The centers of plate thickness of the plate materials 10 and 20 are substantially made to coincide with each other, the end parts thereof are abutted on each other, and friction stir welding is applied thereon. The projections 11 and 12 are cut, and height of the projections 11 and 21 and that of the projections 12 and 22 are substantially equal. In the structural body manufactured by this method, when a tensile load is acted in a direction perpendicular to a joint line, bend deformation is not caused in the vicinity of a joint part even the plate thickness therein is increased. Accordingly, stress generated in the vicinity of the joint part can be reduced, and the structural body can bear under the high tensile load.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a structure. For example, it is suitable for manufacturing a structure such as a railway vehicle or a building made of an aluminum alloy.

[0002]

2. Description of the Related Art In a friction stir welding method, a round bar (referred to as a rotary tool) inserted into a joint is moved along a joining line while rotating, so that the joint is heated, softened, plastically fluidized, and solid-phased. It is a joining method. The rotary tool has a small diameter portion 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 into the joint. This is disclosed in
No. 5 (USP 6050474).

[0003]

Generally, when members are joined by friction stir welding, the strength near the joint decreases due to the influence of frictional heat generated between the rotary tool and the members. For this reason, when a load is applied to a structure manufactured using friction stir welding, in spite of the fact that the strength of the base material portion without the influence of frictional heat is sufficient, in the vicinity of the joint where the strength has decreased,
The structure may be easily destroyed.

A means for preventing such easy destruction of the structure near the joint is disclosed in Japanese Patent Application Laid-Open No. H11-254155.
No. in the official gazette. In this method, a convex portion is provided on one surface of the plate material, the thickness of the sheet near the joint is increased according to the difference in hardness near the joint, and the strength near the joint is improved. However, if there is a gap between the butted portions during the friction stir welding, the plate thickness is not vertically symmetrical, and a predetermined strength cannot be secured. An object of the present invention is to provide a structure having high strength.

[0005]

SUMMARY OF THE INVENTION The object of the present invention is to provide, on both ends, a first projection having substantially the same projection height at one end of a plate, and a second projection provided on one of the first projections. A first member and a second member having a convex portion are prepared, and the end of the first member and the end of the second member are abutted, and the second convex portion is abutted against each other. The friction stir welding is performed with the small diameter portion of the rotating tool inserted into the butted portion while the large diameter portion of the rotating tool is inserted into the second projection, and the second projection is cut. That can be achieved.

[0086]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention is shown in FIGS.
This will be described below. The vehicle body 100 includes an underframe 10 constituting a floor.
1, a roof structure 102 constituting a roof, a side structure 103 constituting a side surface, and a wife structure 104 constituting an end in a longitudinal direction. Underframe 101, roof structure 102, side structure 103
Are manufactured by joining a plurality of extruded members. The longitudinal direction of the extruded profile coincides with the longitudinal direction of the vehicle body. The extruded profile is made of an aluminum alloy.

[0007] The structure near the joint between the plate members 10 and 20 constituting the underframe 101 and the joining method will be described. Plate 10
One end of the end of (20) has a protrusion 11 (21) on the one surface, and the other surface has a protrusion 12 (22) on the other surface. Convex part 11
(21) has a convex portion 13 (23). Plate material 10,
20 have the same thickness. The heights and widths of the protrusions 11 and 21 excluding the protrusions 13 and 23 are equivalent. Convex part 12, 2
2 are equivalent in height and width. The height of the projections 13, 23,
The widths are equivalent. The width of the convex portions 11 and 21 is
3 is larger than the width. The tops of the projections 11, 12, 21, 22 and the surfaces of the plate members 10, 20 are connected obliquely. The combined width of the convex portions 13 and 23 is the large-diameter portion 52 of the rotary tool 50.
Larger than the diameter of.

The plate members 10 and 20 are placed on a bed 30 with the surfaces on the side of the protrusions 12 and 22 facing downward. The end faces of the plate members 10 and 20 are butted, and the plate members 10 and 20 are firmly fixed to the bed 30. The butting surface 40 is perpendicular to the bed 30. The plate thickness centers of the plate members 10 and 20 are substantially the same.

In such a configuration, the plate members 10 and 20 are friction stir welded. The small diameter portion 51 at the tip of the rotary tool 50 is inserted into the butting surface 40 and moved along the joining line.
The rotary tool 50 includes a small diameter part 51 and a large diameter part 52. The small diameter portion 51 and the large diameter portion 52 are coaxial. The axis of the rotary tool 50 and the butting surface 40 substantially coincide. However, as is well known, the rotary tool 50 is slightly inclined in the joining direction. The lower end of the small diameter portion 51 is located slightly above the lower surfaces of the protrusions 12 and 22. The lower end of the large diameter portion 52 is located slightly above the upper surfaces of the convex portions 11 and 21 excluding the convex portions 13 and 23. By this friction stir welding, the gap between the butting surfaces 40 is filled, and the plates 10 and 20 are joined.

Finally, the projections 11 and 21 are cut, and the projections 1 and 21 are cut.
The heights 1 and 21 and the height t of the protrusions 12 and 22 are substantially equal.

Underframe 101 manufactured by the above method
When a tensile load is applied in the direction perpendicular to the joining line, no bending deformation occurs near the joining portion despite the increase in the plate thickness near the joining portion. Therefore, it is possible to reduce the stress generated near the joint and to withstand a high tensile load. Thus, when a high tensile load is applied in a direction perpendicular to the joining line, such as when the vehicle body 100 passes through a tunnel, the above structure is considered to exert a great effect in terms of strength. Although the above embodiment is applied to the underframe 101, the roof structure 1
02 can be applied.

Another embodiment of the present invention will be described with reference to FIGS. The hollow extruded shape member 210 (220) includes two face plates 211 and 212 (221 and 222) and a plurality of ribs 213 (223) arranged in a truss shape. The two face plates 211, 212 (221, 222) are substantially parallel. The pitch of the ribs 213 (223) is the same. The positions of the end faces of the two face plates 211 and 212 (221 and 222) in the direction perpendicular to the extrusion direction substantially match. The end portions of the face plates 211 and 221 and the face plates 212 and 2
The structure is manufactured by joining the ends of the 22. The hollow extruded members 210 and 220 are made of an aluminum alloy.

The structure near the joint between the hollow extruded members 210 and 220 and the joining method will be described. Here, face plate 2
The shapes of the joints 11 and 221 and the joints of the face plates 212 and 222 are the same. Therefore, only the configuration near the joint between the face plates 212 and 222 and the joining method will be described.

A convex portion 214 (224) is provided on one side of the end of the face plate 212 (222), and a convex portion 215 is provided on the other side.
(225) exists. The protrusion 214 (224) has a protrusion 216 (226). The plate thicknesses of the face plates 212 and 222 are equivalent. Convex part 2 excluding convex parts 216 and 226
The height and width of 14, 224 are equivalent. Convex part 216,
226 have the same height and width. Convex parts 216, 226
The height and width of the convex portions 214 and 224 excluding the
5, 225 are equivalent to height and width. Convex parts 214, 22
4 is larger than the widths of the protrusions 216 and 226. Convex part 2
14, 215, 224, 225
The connection to the surface 22 is oblique. Convex parts 215 and 22
6 is larger than the diameter of the large diameter portion 252 of the rotary tool 250. That is, the configuration of the joint is the same as the configuration of the embodiment of FIG.

With the surfaces of the face plates 211 and 221 facing downward,
The hollow extruded members 210 and 220 are placed on the bed 230, butted against each other, and firmly fixed to the bed 230. The butting surface 240 is perpendicular to the bed 230. The plate thickness centers of the face plates 212 and 222 substantially coincide with each other.

In such a configuration, the face plates 212, 222
Is subjected to friction stir welding. As the rotary tool 250, the small diameter portion 2
One having large-diameter portions 252 and 253 at both ends of the 51 axis is used. The diameters of the large diameter portions 252 and 253 are equivalent. The small diameter portion 251 is inserted into the butting surface 240 from the end of the joining line, and is moved along the joining line. The lower end of the large-diameter portion 252 enters the projections 216 and 217 as in the above-described embodiment. The axis of the rotary tool 250 and the butting surface 240 substantially coincide. However, the rotary tool 250 is slightly inclined in the joining direction. That is, the axis of the large-diameter portion 252 is inclined backward so that the axis of the large-diameter portion 253 is located behind the axis of the large-diameter portion 253 in the moving direction. The lower ends of the large diameter portions 252 are convex portions 214, 22 excluding the convex portions 216, 226.
4 is located above the upper surface. The upper end of the large diameter portion 253 is
It contacts the lower ends of the protrusions 215 and 225, but is at a position like this.

By this friction stir welding, the gap between the butting surfaces 240 is filled, and the face plates 212 and 222 are joined. After that, the convex portions 216 and 226 are cut. Thereby, the heights of the protrusions 214 and 224 and the protrusions 215 and 225
Are substantially equal.

Although a slight protrusion is formed on the lower surfaces of the protrusions 215 and 225 due to the joining, it is acceptable as an error range. Similarly, cutting of the protrusions 216 and 226 may be unnecessary. When the joining of the butted portions on the upper surface side is completed, the hollow profile is turned upside down and joined in the same manner.

The technical scope of the present invention is not limited to the language described in each claim or the language described in the Summary of the Invention, and is easily replaced by those skilled in the art. It extends to a range.

[0020]

According to the present invention, when a tensile load is applied in the direction perpendicular to the joint line, the stress generated near the joint can be reduced, so that a structure having high strength can be provided.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing the vicinity of a joint according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view showing a state in which the components joined according to FIG. 1 are finished.

FIG. 3 is a perspective view of a vehicle body of a railway vehicle.

FIG. 4 is a longitudinal sectional view showing a vicinity of a joint according to another embodiment of the present invention.

FIG. 5 is a longitudinal sectional view showing a state where the components joined according to FIG. 4 are finished;

FIG. 6 is a longitudinal sectional view of a hollow extruded member.

[Explanation of symbols]

10, 20: plate material, 11, 12, 21, 22: convex portion, 1
3, 23: convex, 30: bed, 40: joining surface, 50:
Rotating tool, 51: small diameter part, 52: large diameter part, 100: body, 101: underframe, 102: roof structure, 103: side structure, 104: wife structure, 210, 220: hollow extruded shape member, 211, 212 , 221, 222: face plate, 213,
223: rib, 214, 215, 216, 224, 22
5, 226: convex portion, 230: bed, 240: joining surface,
250: rotary tool, 251: small diameter portion, 252, 253:
Large diameter part

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshiaki Makino 794, Higashi-Toyoi, Kazamatsu-shi, Yamaguchi Prefecture Inside the Kasado Plant of Hitachi, Ltd. F term in Hitachi, Ltd. (reference) 4E067 AA05 BG00 DA13 DA17 EB00

Claims (7)

[Claims] 1. An end portion of a plate has a first convex portion having substantially the same protrusion height on both surfaces at one end thereof, and one of the first convex portions.
Preparing a first member and a second member having a second convex portion on the convex portion of the first member, abutting the end of the first member with the end of the second member, and The small diameter portion of the rotary tool is inserted into the butted portion while the large diameter portion of the rotary tool is inserted into the second convex portion, and friction stir welding is performed. Cutting the convex part of the structure, The manufacturing method of the structure characterized by the above-mentioned. 2. The method of manufacturing a structure according to claim 1, wherein
The rotary tool has large diameter portions at both ends in the axial direction of the small diameter portion. One of the large diameter portions is located in the second convex portion, and the other large diameter portion is the second large diameter portion. Wherein the friction stir welding is performed by being positioned on a side other than the convex portion of the structure. 3. The method of manufacturing a structure according to claim 1, wherein
The top of each of the first projections and the surface of the plate are connected by an inclined surface, and the friction stir welding is performed by abutting the first member and the second member.
A method of manufacturing a structure characterized by the following. 4. An end portion of a plate has first projections having substantially the same projection height on both surfaces at one end, and one of the first projections is provided at one end of the plate.
Preparing a first member and a second member having a second convex portion on the convex portion of the first member, abutting the end of the first member with the end of the second member, and The small diameter portion of the rotary tool is inserted into the butted portion while the large diameter portion of the rotary tool is inserted into the second convex portion, and friction stir welding is performed. The method of manufacturing a railway vehicle, characterized in that the convex portion is cut and the second convex portion side is arranged on the lower surface side of the underframe or the upper surface side of the roof of the railway vehicle. 5. An end portion of a plate has a first convex portion having substantially the same protrusion height on both surfaces at one end thereof, and one of the first convex portions.
Preparing a first member and a second member having a second convex portion on the convex portion of the first member, abutting the end of the first member with the end of the second member, and The small diameter portion is inserted into the butted portion using a rotary tool having large diameter portions at both axial ends of the small diameter portion, and one of the large diameter portions is the second diameter. Positioned inside the convex portion, the other large-diameter portion is positioned on the side other than the second convex portion, friction stir welding is performed, and the second convex portion is cut, and the member is used for a railway vehicle. A method for manufacturing a railway vehicle, wherein the method is used for an underframe, and a side other than the second convex portion is used on a lower surface side of the underframe or an upper surface side of a roof. 6. An end portion of each of two plates constituting an outer surface of the hollow profile, having a first convex portion having substantially the same protruding height on both surfaces thereof, and A first hollow member and a second hollow member having a second convex portion on the first convex portion on the outer surface side are prepared, and the end of the first member and the end of the second member are prepared. And abutting the second convex portions with each other, using a rotary tool having a large diameter portion at each axial end of the small diameter portion, inserting the small diameter portion into the butted portion, The large-diameter portion is located in the second convex portion, and the other large-diameter portion is located on a side other than the second convex portion, and friction stir welding is performed. While cutting, the hollow profile is used for the undercarriage of a railway vehicle, and the second convex portion side is used as the underside of the underframe or the roof. A method for manufacturing a railway vehicle, wherein the method is used on an upper surface side. 7. At each end of two plates constituting the outer surface of the hollow profile, first and second surfaces have first projections having substantially the same protrusion height. A first hollow member and a second hollow member having a second convex portion on the first convex portion on the outer surface side are prepared, and the end of the first member and the end of the second member are prepared. And abutting the second convex portions with each other, using a rotary tool having a large diameter portion at each axial end of the small diameter portion, inserting the small diameter portion into the butted portion, The large-diameter portion is located in the second convex portion, and the other large-diameter portion is located on a side other than the second convex portion, and friction stir welding is performed. While cutting, the hollow profile is used for the underframe of a railway vehicle, and the side other than the second convex portion is the underside of the underframe or Is used on the upper surface side of the roof, and a method of manufacturing a railway vehicle.