JP2000288749A - Structural body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the weight of a joint by forming a connection line of a rib in the vicinity of a welded part to a face plate or a connection line of a projecting piece to the rib of the bead joint of a member comprising parallel face plates and the rib to connect these parallel plates to be of arc shape projecting to a hollow part side around the welded part side. SOLUTION: Hollow shapes 100, 110 are butted to each other, and inclined surfaces 122, 122 are brought into contact with each other. A rear surface of a face plate 111 (112) located at a hollow part 119 of the hollow shape 110 is connected to a rib 116 by an arc-like projecting portion 131 projecting to the hollow part 119 side and arcs 132, 133 recessed at both ends. A rotating body 20 is inserted in projecting portions 104, 114 of the hollow shapes 100, 110, and moved along the welding line, and the hollow shapes 100, 110 are friction-agitation joined. The load of the body 20 during the joining is sustained by the rib 106. The dotted line denotes the connection line of the rib 106 to the face plate 111. The sectional area can be reduced by the difference in portion between the dotted line and the solid line.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to friction stir welding, and more particularly to a joint shape thereof.
The present invention relates to a friction stir welding suitable for joining a structure, for example, a member made of an aluminum alloy used for a railway vehicle or a building.

[0002]

2. Description of the Related Art JP-A-9-309164 (EP)
As in 0797043A2), the friction stir welding method is
This is a method in which a round bar (referred to as a rotating body) inserted into a joint is moved along a joining line while rotating, and the joint is heated and softened, plastically flows, and solid-phase joined. The rotating body is composed of a small-diameter portion inserted into the joint and a large-diameter portion located outside. The small diameter part and the large diameter part are coaxial. Rotate the large diameter side. The boundary between the small diameter portion and the large diameter portion is slightly inserted into the joint. The joining by the friction stir welding method is applied to the butted portion and the overlapped portion.

Further, as shown in FIG. 7 of the prior art, a projecting portion projecting toward the rotating body is provided at the joint of the members to be joined,
This part is joined. Also, as shown in FIG. 7, a protruding piece is provided which protrudes from the rib at the end of the hollow member of one of the members to be joined to the other hollow member, and a face plate of the other hollow member is provided on this protruding piece. Piled up.

[0004]

In friction stir welding, since a metal is fluidized by inserting a rotating body of a welding tool into a member to be welded, a large force acts on the member to be welded. For this reason, when joining a hollow profile, metal tends to flow out to the back side as shown in FIG. 8 of the prior art. For this reason, it is necessary to increase the protrusion for replenishing the outflow metal. In addition, holes are easily generated in the joining bead.

[0005] One means of preventing this is to increase the thickness of the members to be joined at the joint to prevent the metal from flowing out. For example, the diameter of the arc of the connecting line between the face plate and the rib of the joining portion or the arc of the connecting line between the protruding piece and the rib is increased to increase the thickness of the external wall. This arc is recessed toward the face plate. Therefore, the cross-sectional area increases and the weight increases. It is an object of the present invention to provide a lightweight joint.

[0006]

SUMMARY OF THE INVENTION The object of the present invention is to connect a connecting line between a rib and a face plate in the vicinity of a connecting portion or a connecting line between a protruding piece and a rib to an arc centered on the connecting portion side, that is, a hollow side. This can be achieved by forming an arc projecting from

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention is shown in FIGS.
This will be described below. The member to be joined is a hollow extruded member made of a metal member, for example, an aluminum alloy. The structural members, for example, the body of a railway vehicle, are manufactured by joining the shaped members.
A side structure, a roof structure, a wife structure, and a floor structure of the vehicle body are constituted by a plurality of shapes. In the case of the side structure and the roof structure, the length of the profile is at most the same as the length of the vehicle body. The longitudinal direction of the profile is oriented in the longitudinal direction of the vehicle body.

The hollow extruded profile 100 (110) comprises two substantially parallel face plates 101, 102 (111, 11).
2) and a plurality of ribs 103, 106 (1
13, 116) and at the end of the joint, the profile 100,
Projection 104 (114) projecting in the thickness direction of 110
And projecting pieces 117 and 117 projecting from the rib 106 at the end toward the shape member 110 of the other party.

[0009] The ribs 103 and 113 are shaped members 100 and 110, respectively.
Along the width direction. The rib 103 (113) is inclined with respect to the face plates 101, 102 (111, 112). The ribs 106 (116) are attached to the face plates 101, 102 (1
11, 112). 109, 119
Is a hollow part.

At the ends of the profiles 100, 110, a vertical surface 12 is provided.
1, an inclined surface 122 and a horizontal surface 123 connecting between the two. The vertical surfaces 121 are face plates 101, 102, 1
11 and 112. Horizontal surface 123 is face plate 10
Parallel to 1, 102, 111, 112. Shape 110
Is located on the face plate side of the projecting piece 117. The slope 122 of the profile 100 is in a recess for receiving the projecting piece 117. The inclined surface 122 is inclined from a position where the vertical surface 121 enters the thickness direction of the profile. The protruding portion 117 protrudes outward (in the side of the profile 100) in the width direction of the profile 100 from the vertical surface 121 of the profile 110. Projections 104, 11
4 is at the end of each faceplate 101, 102, 111, 112.

The ribs 116 of the profile 110 are located on an extension of the joint. It is assumed that the axis of the rotating body 20 is located on an extension of the center of the thickness of the rib 116. The vertical surface 121 of the profile 110 is located slightly closer to the center in the width direction of the profile 110 than the center of the thickness of the rib 116.
Two vertical surfaces 12 within the extension of the thickness of the rib 116
There is one. The thickness of the rib 116 is greater than the thickness of the rib 106.

When the profiles 100 and 110 are butted,
The vertical surfaces 121 contact each other. However, this is an ideal case, and the vertical surfaces 121, 12
In many cases, there is a gap between 1. Inclined surfaces 122, 12
Although the two are shown as contacting each other, there are often gaps. The concave portion of the profile 100 having the inclined surface 122 and the convex portion of the profile 110 are provided to facilitate the combination of the two profiles. For this reason, the concave portion of the profile 100 is provided large.

The face plate 1 at the position of the hollow portion 119 of the profile 110
11 (112) and the rib 116, the hollow portion 1
It is connected by a circular arc 131 protruding to the 19 side and concave circular arcs 132 and 133 at both ends thereof. Arc 1
The recesses 32 and 133 are formed by projecting the arc 131. The concave portions of the arcs 132 and 133 are
This means that the arc 131 is more concave than the tangent at the center. The projecting portion of the arc 131 is called an arc-shaped projecting portion.

The position of the arc 131 is determined at a position where a predetermined distance is secured along the tip of the small diameter portion 21 when the rotating body 20 is inserted to a predetermined position. The center position of the arc 131 may be considered with reference to the position of the corner at the tip of the small diameter portion 21 inserted to the predetermined position. Since the insertion force of the rotating body 20 is supported by the rib 116b, the metal easily flows out from the periphery of the rib 116b to the outside. Therefore, the outside thickness is increased. According to an experiment, the distance from the corner of the small diameter portion 21 to the arc 131 is preferably, for example, 5 mm. Slope 1
The metal easily flows out from the gap between the protrusions 22 and 122 and between the protrusion 117 and the rib 106.

The dotted line is a connecting line between the rib and the face plate according to the conventional idea. In this example, it is composed of a straight line and arcs provided at both ends of the straight line. The straight line is a tangent line in contact with the center of the circular arc 131. The whole can be formed into an arc depressed toward the joining bead 30 side. As can be seen by comparing the dotted and solid lines, the cross-sectional area of this portion can be reduced according to the present invention.
Therefore, the shape member 110 can be reduced in weight.

In this example, concave portions are provided at both ends of the arc 131, but concave portions can be provided only on one side. On the side where no concave portion is provided, a straight line is connected to the end of the arc, and the end and the rib (or face plate) are connected by an arc. However, the degree of weight reduction is reduced. The rear surface of the tip of the protruding piece 117 has an arc shape that becomes thinner toward the tip. The size of the arc 135 is the same as that of the arc 131.

The rotating body 20 for friction stir welding has a small-diameter small-diameter portion 21 provided at the tip of a large-diameter round bar. A boundary 20b between the large-diameter portion 20a and the small-diameter portion 21 of the rotator 20 has an arc shape that is concave toward the large-diameter portion 20a. The small diameter portion 21 is a screw. The joining is performed by rotating the rotating body 20 to form the member 100,
110, and is moved along the joining line. The large-diameter portion 20 a side of the axis of the rotating body 20 is inclined rearward with respect to the moving direction of the rotating body 20. For this reason, the rear end of the boundary 20b enters the members 100 and 110, but the front end is outside the outer surface of the top of the projections 104 and 114 (in FIG. 1, in the case of the upper projections 104 and 114, the upper side). (Upper)
It is located in. The rear end of the boundary 20b
4 and the outer surface of the faceplates 101, 102, 111, 112 of the non-projecting portion. The “rear end”, “front end” and the like are based on the moving direction of the rotating body 20.

FIG. 1 shows a state in which the rotating body 20 has been inserted to a predetermined position of the profiles 100 and 110. A part of the tip of the small diameter portion 21 is omitted. The tip of the small diameter portion 21 is located near the horizontal plane 123.

At the time of joining, the profiles 100 and 110 are restrained by being pressed from above by a vice or a device on a bed. Also, the profile 100 is directed toward the profile 110 so that the inclined surfaces 122 of the profiles 100 and 110 contact each other (FIG. 1).
At left and right). In joining, there is a roller that moves with the movement of the rotating body 20 for friction stir welding. The rollers are located before and after in the moving direction of the rotating body 20. The rollers press the left and right of the protrusions 102, 102 or the upper surfaces of the protrusions. The upper and lower joints are formed by joining one side and then turning it over or joining the rotating body 2 up and down.
0 and 20 are arranged and bonding is performed at the same time. The number of profiles 100, 110 placed on the bed is two or more. After the friction stir welding, the structure obtained by this welding is further joined by friction stir welding or ordinary welding to form a vehicle body.

Since the inclined surfaces 122 are provided on the butting surfaces of the profiles 100 and 110, the two profiles can be easily combined. In addition, it is possible to prevent the two profiles 100 and 110 from shifting vertically. In addition, when the two inclined surfaces 122 are in contact with each other, it is possible to prevent the metal from flowing out of this portion as compared with the case where the two inclined surfaces 122 are not in contact with each other. The gap between the vertical surfaces 121, 121 is closed by the movement of the metal from the protrusions 104, 114.

The vertical surfaces 121, 121 may be inclined, but it is necessary to increase the amount of metal movement from the protrusions 104, 114. At the end of the protruding piece 117 and the profile 100, there is an inclined surface 122, but the face plates 101, 102, 1
It may be a plane parallel to 11, 112.

After joining, if necessary, protrusions 104, 11
4 is cut so as to be flush with the outer surfaces of the face plates 101 and 111. When used for the body of a railway car, as shown in FIG. 2, the protruding portions 104 and 114 on the outer surface of the car body are cut. Reference numeral 30 denotes a joining bead.

The embodiment of FIG. 3 shows the rib 106 and the rib 116b.
And the joining portion is located in the middle of the above. The rib 116b and the face plate 111 (112) are connected by the arc-shaped protrusion 131 as described above. Rib 116b
And the base of the protruding piece 117 are connected by an arc 141 that is convex toward the other protruding piece 117 and a concave arc that is directed toward the face plate 111 on both sides thereof. Rib 106 and face plate 1
01 (102), an arc 1 convex toward the hollow portion 109 side
45 and concave arcs 1 on both sides thereof on the vertical surface 121 side.
46 and 147. Dotted lines are connection lines based on conventional thinking, all of which are arcs. Projection piece 1
The dotted line for the arc 141 of the seventeenth section and the profile 100
The dotted line on the side is omitted. Arc 131, 141, 1
The size of 45 is the same.

According to this, since the load at the time of joining is borne by the two ribs 106, 116, the two ribs 106, 1
The vicinity of 16b is thickened. Also, two ribs 10
6 and 116b can be made smaller than in FIG. Therefore, the weight can be reduced. Also, the rib 106b
Between the rib 106b and the face plate, between the rib 106b and the projecting piece 117, and between the rib 106 and the face plate.

Since the recess (132) between the arc 131 and the rib 116b is small, the recess can be omitted. For example, a tangent is provided at the end of the arc 131 on the side of the rib 116b, and the tangent and the rib 116b are connected by an arc. Also, the projecting piece 117 on the side of the face plate 112 is
The same can be done by installing it on the side. Further, the horizontal surface 123 may be used without the inclined surface 122.

When the profiles 100 and 110 are combined, the inclined surfaces 122 and 122 come into contact with each other,
1 and 121 are provided so as to form a gap. For example, the interval between the inclined surfaces 122 of the concave portions is provided smaller than the interval between the inclined surfaces 12 of the convex portions. According to this, the outflow of metal from the inclined surface can be further prevented.

The technical scope of the present invention is not limited to the language described in the claims or the language described in the section for solving the problems, and is easily replaced by those skilled in the art. It extends to a range.

[0028]

According to the present invention, when the friction stir welding method is applied, the weight of the member can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a joint for friction stir welding according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a structure made of a profile using the joint of FIG. 1;

FIG. 3 is a longitudinal sectional view of a friction stir welding joint according to another embodiment of the present invention.

[Explanation of symbols]

Reference numeral 20: rotating body, 30: joining bead, 100, 110: hollow extruded member, 101, 102, 111, 112: face plate, 104, 114: projecting portion, 106, 116: rib,
109, 119: hollow portion, 117: projecting piece, 121: vertical surface, 131, 141, 147: arc-shaped projecting portion.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F16S 1/12 E04B 1/60 503N // B23K 103: 10 (72) Inventor Akihiro Sato Kudamatsu City, Yamaguchi Prefecture 794 Higashi Toyoi Inside the Kasado Plant of Hitachi, Ltd. (72) Inventor Kazunari Fukuyoro In-house 794 Higashi Toyoi Hitachi Kasamatsu Machinery Industries Co., Ltd. (72) Inventor Ken Kawasaki Kudamatsu City, Yamaguchi Prefecture 794, Higashitoyoi, Kasado Plant, Hitachi, Ltd.

Claims (1)

[Claims] 1. A first member comprising two substantially parallel face plates, a plurality of ribs connecting the two face plates, and a second member having two substantially parallel face plates. The first member and the second member are joined by two joining beads, and one of the joining beads is one of the face plate of the first member and the second member. And the other joining bead joins the other face plate of the first member and the other face plate of the second member, and the joining bead Wherein the connecting line between the rib near the first member and the back surface of the face plate at the position of the hollow portion of the first member has an arc shape protruding toward the hollow portion.