JP2000225436A - Manufacturing method of hollow material - Google Patents

Abstract

(57) [Summary] [Problem] Two outer plate portions arranged in parallel and spaced apart from each other, and a plurality of partition portions partitioning a space between the two outer plate portions are continuously formed in a length direction. Provided is a method for manufacturing a hollow material, which is manufactured by extrusion molding a wide hollow material that has been manufactured, and in which the diameter of an extrusion die can be reduced. SOLUTION: One plate-shaped portion 2 for forming an outer plate portion, which has a plurality of developed portions A to be bent and formed at a middle portion in a width direction, a rib portion 4 for forming a partition portion, and a processed portion to be developed. Site A
The hollow material main body 1 having the other outer plate portion forming plate-shaped portion 3 having the opening 6 formed in the outer facing portion of the hollow member 1 is manufactured by extrusion molding. Next, the processed portion A of the hollow material body 1 is flattened. Thereafter, the cover member 10 is put on the opening 6 and joined by friction stir welding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to, for example, railways,
The present invention relates to a method of manufacturing a floor material, a wall material, a ceiling material of a vehicle such as a bus or a ship, or a hollow material used as a constituent member of a building structure.

[0002]

2. Description of the Related Art One example of a method for producing a hollow metal member is an extrusion forming method. According to this, there is an advantage that the production of a hollow material can be performed efficiently and cost-effectively, and it is generally widely used.

The hollow member (31) shown in FIG.
Is made of a metal such as aluminum (including its alloys, the same applies hereinafter), etc., and is composed of two wide and long outer plates (32) and (33) spaced apart in parallel, and both outer plates. (32)
(33) communicate with each other and extend in the length direction, and are formed of a plurality of partition portions (34) which partition the space between both outer plate portions (32) and (33) in a zigzag shape in the width direction. .
The outer plates (32) and (33) are both formed in a flat shape. In the same figure, (35)... Are hollow portions of the hollow material (31) and are formed in a triangular cross section.

Thus, such a wide hollow material (31)
When extrusion is manufactured by extrusion, it is necessary to use an extrusion die having a considerably large diameter in order to correspond to the width of the hollow member (31).
Manufacturing had limitations.

In order to make the diameter of the extrusion die as small as possible, Japanese Patent Laid-Open No. Hei 10-244343 discloses, for example, that one of the outer plate portions (32) has a partition wall portion and a bent portion. At the same time, an opening in which the other outer plate portion (33) does not exist is formed at the inside facing portion of the bent portion, and a hollow material body bent substantially in a V-shape at the bent portion is manufactured by extrusion molding. A method is disclosed in which after the hollow material body is flattened and processed at a bent portion, a cover member is attached to the opening.

According to this method, it is not necessary to use a large-diameter extrusion die, and therefore, there is an advantage that the design and manufacture of the die become easy, and as a result, the manufacturing cost of the hollow material is reduced.

[0007]

However, in this method, it is difficult to make the diameter of the extrusion die much smaller because the cross-sectional shape of the hollow material body is substantially V-shaped or the like. In particular, in recent years, a considerably wide hollow material has been used, and in this regard, it is desired to further reduce the diameter of the extrusion die.

The present invention has been made in view of such technical background, and an object of the present invention is to provide a method for manufacturing a hollow material capable of further reducing the diameter of an extrusion die when manufacturing a hollow material. It is in.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides two outer plates having flat portions spaced apart in parallel and a space between the two outer plates. A plurality of partition walls and a method of manufacturing a hollow material for manufacturing a hollow material formed continuously in the length direction, the method including a plurality of unprocessed portions including a bent portion in an intermediate portion in a width direction. A plate portion for forming one outer plate portion, a rib portion for forming a partition wall portion, and a plate portion for forming another outer plate portion having an opening formed in a portion opposed to the development target portion. The hollow material main body is manufactured by extrusion molding, and after the processed portion of the hollow material main body is flattened and processed, the opening is covered with a cover member for closing the opening and joined. .

[0010] According to this, the hollow material body is bent at each portion to be processed, and thus has a polygonal cross section. As a result, a small-diameter extrusion die can be used for manufacturing the hollow material body.

It is preferable that the opening is formed in a portion facing the outside of the portion to be processed.

This is because, for example, when the opening is formed at the inside facing portion of the unfolded portion, if the bending angle of the unfolded portion is set to be large, the other portion of the unfolded portion at the inside facing portion of the unfolded portion is This is because the plate portion for forming the outer plate portion and the rib portion for forming the partition portion may overlap with each other. For this reason, it is difficult to set a large bending angle of the portion to be processed.

On the other hand, when the opening is formed at a portion outside the portion to be processed, the other outer plate portion is formed even when the bending angle of the portion to be processed is set to be large. There is no inconvenience that the plate portion for forming and the rib portion for forming the partition portion overlap. For this reason, the bending angle of the portion to be processed can be set large. Therefore, it is not necessary to take into account the other plate-shaped portion for forming the outer plate portion and the rib portion for forming the partition portion when setting the bending angle of the portion to be developed, so that the hollow material main body is more compact. It can be extruded and manufactured in a state, so that the extrusion die can be made smaller.

In the case where the ribs are arranged in a truss shape, one of the plate portions for forming the outer plate portion and the other plate portion for forming the outer plate portion are formed by the rib portion. In this state, the unfolding process is performed on the portion to be unfolded, so that undesired bending of other portions during the unfolding process is prevented. Further, since the ribs are arranged in a truss shape, a hollow material having high strength can be obtained.

In the case where the cover member is provided with a support wall for supporting the plate-shaped portion for forming the one outer plate portion on the inner surface thereof, the cover member may be provided with one of the outer plate portions. Are supported by the support wall and reinforced. Therefore, the strength of the obtained hollow material is further improved.

[0016]

Next, embodiments of the present invention will be specifically described with reference to the drawings.

FIGS. 1 to 4 show a first embodiment of the present invention. As shown in FIG.
1) is to be manufactured.

As described above, the hollow member (31) shown in FIG. 12 has two upper and lower wide and long first outer plate portions (32) and second outer plate portions (32) which are arranged in parallel and separated from each other. 33) and a plurality of partition portions (34) that partition the space between the outer plate portions (32) and (33) are made of aluminum formed continuously in the length direction. The first outer plate portion (32)
The and the second outer plate portion (33) are both formed in a flat shape. The partition part (34) is composed of first and second outer plate parts (3
2) The space between (33) is divided in a zigzag shape in the width direction, and is arranged in a truss shape.

In the first embodiment, in order to manufacture the hollow member (32) shown in FIG. 12, first, the hollow member body (1) shown in FIG. 1 is manufactured by extrusion.

The hollow material body (1) is provided with a first outer plate portion (3).
2) A first plate-shaped part (2) for forming and the first plate-shaped part (2)
And a plurality of ribs (4) for forming a partition wall (34) formed integrally with the second plate (33) formed integrally with the ribs (4). A plate-shaped portion (3).

The first plate-like portion (2) has two unprocessed portions (A) each having a bent portion at an intermediate portion in the width direction thereof, and each of the bent portions is bent in a substantially rectangular shape. It is formed in a triangular cross section.

On the other hand, the second plate-shaped portion (3) has an opening (6) at a portion facing the outside of the processed portions (A) and (A).
(6) is formed, and the opening (6) is formed.
It is divided into three parts due to the existence of (6).

The hollow material body (1) is formed by using an extruder (not shown) equipped with an extrusion die (not shown) having a molding gap corresponding to a predetermined sectional shape, and using an extruder (not shown). It can be easily manufactured by loading and extruding a billet. During the extrusion production, the hollow material body (1) is extruded in a triangular cross-section, so that a small-diameter extrusion die can be used.

Next, the two developed portions (A) and (A) of the hollow material body (1) are flattened, respectively, so that the hollow material body (1) can be developed as shown in FIG. The entire first plate portion (2) is flattened.

This development can be easily performed by using a known development apparatus (not shown). In addition, since the ribs (4) for forming the partition walls are formed in the truss shape in the hollow material main body (1), other parts are not unintentionally bent during the unfolding process. Therefore, the first plate-shaped portion (2) having high flatness is formed.

Next, as shown in FIGS.
The two opening portions (6) and (6) of the plate-shaped portion (3) are covered with the opening closing cover members (10) and (10), respectively, and the opening portions (6) and (6) are closed.

The cover member (10) is made of, for example, an extruded aluminum material and has a width substantially equal to the width of the opening (6) and a length equal to the length of the opening (6). A plate-like closing portion (11) set to be approximately the same size as
A support wall (12) having an inverted V-shaped cross section is provided integrally on the inner surfaces of both side edges of the closing portion (11) and extends in the longitudinal direction of the closing portion (11). The support wall portion (12) abuts and supports the first plate-shaped portion (2) on its inner surface, and has the same shape as two adjacent rib portions (4) and (4) for forming a partition wall portion. have. And
As shown in FIG. 3, the cover member (10) is connected to the opening (6).
When the support wall portion (12) is put on the support plate, the top portion of the support wall portion (12) abuts on the inner surface of the developed portion to be flattened by the unfolding process, thereby supporting the first plate portion (2). are doing. Further, in this state, the outer surface of the closing portion (11) is flush with the outer surface of the second plate-shaped portion (3).

Next, as shown in the figure, the cover member (10) is joined to the opening (6) by friction stir welding, and the cover member (10) is fixed. This joining is performed, for example, at the contact portions (15) (15) between the closing portion (11) and the second plate-shaped portion (3).

The friction stir welding will be briefly described as follows. (20) is a welding tool for friction stir welding,
It has a large-diameter cylindrical rotor (21) and a small-diameter pin-shaped probe (22) protruding on the axis of the end face (21a) of the rotor (21). By using the joining tool (20), the rotor (21) is rotated and the probe (2) is rotated.
2) While rotating, insert it into the contact part (15). Then, the probe (22) is relatively moved along the contact portion (15) in the inserted state. Friction heat generated by the rotation of the probe (22), or furthermore, friction generated by sliding between the end surface (21a) of the rotor (21) and the outer surfaces of the second plate-shaped portion (3) and the closing portion (11). The probe (2
2) The vicinity of the contact portion with the softening portion is softened, and the softened portion is stirred by the rotation of the probe (22), and the softening and stirring portion reduces the traveling pressure of the probe (22) with the movement of the probe (22). After receiving the plastic flow in such a manner as to flow backward in the traveling direction of the probe (22) so as to fill the passage groove of the probe (22), the frictional heat is rapidly lost and the solidified material is cooled and solidified. This phenomenon is sequentially repeated with the movement of the probe (22), and finally, as shown in FIG. 4B, the cover member (10) is fitted to the opening (6) by the contact part (15). In (15), it is firmly joined and integrated.
(W) and (W) are joining portions formed by the friction stir welding, and are formed along the contact portions (15) and (15). In addition,
Although not shown, the top of the support wall (12) of the cover member (10) may be further joined to the first plate-like portion (2) by friction stir welding.

This friction stir welding is a kind of solid-phase welding method. Since the heat input amount is smaller than that of fusion welding such as MIG or TIG and the stress accompanying solidification shrinkage does not occur, the welding portion (W) This has the advantage that deformation and cracking due to nearby thermal strain hardly occur. Therefore, it is desirable to join the cover member (10) to the opening (6) by friction stir welding. However, it is also possible to join by fusion welding such as MIG or TIG.

The hollow member (31) thus obtained has high strength and high flatness because the partition walls (34) are arranged in a truss shape. Further, the strength of the hollow member (31) is further increased because the first outer plate portion (32) is supported by the support wall portion (12) of the cover member (10). Further, since the joining of the cover member (10) to the opening (6) is performed by friction stir welding, deformation and cracking due to thermal strain near the joining portion (W) hardly occur. Therefore, the bonding state is good.

In the first embodiment, the hollow material body (1) is manufactured by extrusion with a triangular cross section. However, as in the second embodiment shown in FIGS. It is also possible to extrude and manufacture the hollow material body (1) in the shape of a pentagonal cross section.

In the second embodiment, as shown in FIG.
By manufacturing the hollow material main body (1) by extrusion molding in the shape of a pentagonal cross section, a hollow material (see FIG. 7) wider than the hollow material of the first embodiment is to be manufactured.

The first plate portion (2) of the hollow material body (1)
Has four unfolded portions (A) at the middle portion in the width direction. On the other hand, the second plate portion (3)
Are formed with openings (6) at the outside facing portions of the developed processing portions (A).
Is divided into five parts.

After manufacturing such a hollow material body (1) by extrusion molding, a desired hollow material is manufactured by the same steps as in the first embodiment. The manufacturing procedure will be briefly described as follows.

First, the four development processing portions (A)... Of the hollow material main body (1) are flattened, respectively, so that the first plate of the hollow material main body (1) as shown in FIG. The entire shape (2) is flattened.

Next, the cover members (1) are respectively inserted into the openings (6) of the second plate-shaped portion (3) of the hollow material body (1).
0), the opening is closed, and the cover member (10) is joined to the opening (6) by friction stir welding. FIG. 7 shows the hollow member (31) thus obtained.

The obtained hollow member (31) is wider than that of the first embodiment. Therefore, by manufacturing the hollow material body (1) by extrusion molding in a polygonal cross-sectional shape, a wider hollow material can be obtained with a small-diameter extrusion die.

In the first and second embodiments, the hollow member (31) to be manufactured is flat, but the third embodiment shown in FIGS. A right angle corner (B1) (B2)
It is also possible to manufacture a hollow material (31) bent in an L-shape in the width direction around the corners (B1) and (B2).

The hollow member (3) manufactured in the third embodiment
1), as shown in FIG. 10, one piece becomes a floor material and the other piece becomes a wall material, and the first outer plate portion (32) has two flat portions (32a). (32a) and one corner portion (B1), and these two flat portions (32a) (32a) are connected via the corner portion (B1). Similarly, the second outer plate portion (33)
Has two flat portions (33a) (33a) and one corner portion (B2), and these two flat portions (33a).
a) (33a) is connected via a corner (B2). In addition, the flat portion (3
2a) and (33a) are spaced apart in parallel.

In order to obtain such a hollow material (31), in the third embodiment, as shown in FIG. 8, the hollow material body (1) is manufactured by extrusion molding in a pentagonal cross section.

The first plate-like portion (2) of the hollow material body (1)
Has three developed processing portions (A) each having a bent portion at an intermediate portion in the width direction thereof, and has the corner portion (B).
1) is provided. On the other hand, the second plate-shaped portion (3) is formed by forming openings (6) at the outside opposing portions of the unprocessed portions (A). Have been.

After manufacturing such a hollow material main body (1) by extrusion molding, a desired hollow material (31) is manufactured by the same process as in the first and second embodiments. The manufacturing procedure will be briefly described as follows.

First, each of the three development processing portions (A)... Of the hollow material body (1) is flattened and processed, thereby forming the first plate-like portion (2) as shown in FIG. Two flat portions (2a) and (2a) are formed.

Next, the cover members (1) are respectively placed in the openings (6) of the second plate-shaped portion (3) of the hollow material body (1).
0), the opening is closed, and the cover member (10) is joined to the opening (6) by friction stir welding.

By doing so, the part to be the floor material,
Section L shown in FIG. 10 integrally having a portion to be a wall material
A hollow member (31) in the shape of a letter can be obtained.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments.

For example, as the cover member (10), FIG.
1 (a) and (b) may be used.

The cover member (10) shown in FIG.
A support wall portion (13) formed of one rising rib extending in the length direction of the closing portion (11) is integrally provided on the inner surface of the middle portion in the width direction of the closing portion (11). Things.

The cover member (10) shown in FIG.
A support wall (1) having a V-shaped cross section extending in the longitudinal direction of the closing portion (11) is provided on the inner surface of the middle portion in the width direction of the closing portion (11).
4) is an erect body.

Alternatively, as shown in FIG.
It is also possible to use a cover member (10) consisting only of a closing part (11) without a supporting wall.

[0052]

As described above, according to the present invention, there are provided two outer plate portions having flat portions spaced apart in parallel and a plurality of partition portions partitioning a space between the two outer plate portions. Is a method for manufacturing a hollow material for manufacturing a hollow material formed continuously in the length direction, wherein one outer plate portion having a plurality of unprocessed portions to be processed formed of a bent portion in an intermediate portion in a width direction. A hollow member body having a plate portion for forming, a rib portion for forming a partition wall portion, and a plate portion for forming another outer plate portion having an opening formed in a portion opposed to the developed portion, Since the hollow member main body can be manufactured by extrusion with a polygonal cross-section because it is manufactured by extrusion molding, the diameter of the extrusion die can be further reduced. As a result, extrusion die design,
Manufacturing is much easier, which can significantly reduce manufacturing costs.

In the case where the opening is formed at a portion outside the portion to be processed, the plate-shaped portion for forming the other outer plate portion is used when setting the bending angle of the portion to be processed. It is not necessary to take into account the ribs for forming the partition and the partition wall, so that the hollow material body can be extruded and manufactured in a more compact state, and thus the extrusion die can be made smaller in diameter.

When the ribs are arranged in a truss shape, one of the plate portions for forming the outer plate portion and the other plate portion for forming the outer plate portion are formed by the rib portions. It is strongly reinforced, and in this state, the unfolding process of the unfolded portion is performed, so that it is possible to prevent other portions from being unintentionally bent during the unfolding process, and thus has high dimensional accuracy. High strength hollow material can be obtained.

In the case where the cover member is provided with a support wall portion for supporting the one plate portion for forming the outer plate portion on its inner surface, the plate member for forming the one outer plate portion is provided. Since the shape is supported and reinforced by the support wall, there is an advantage that the strength of the obtained hollow material is further improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a hollow material main body according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of a hollow member main body and a cover member that have been developed.

FIG. 3 is an enlarged sectional view showing a state in which a cover member is placed over an opening of a hollow material main body.

4A is a cross-sectional view showing a state in which a cover member is joined to an opening of a hollow material main body, and FIG. 4B is an enlarged cross-sectional view of FIG.

FIG. 5 is a sectional view of a hollow material body according to a second embodiment of the present invention.

FIG. 6 is a cross-sectional view of a hollow member main body and a cover member that have been developed.

7A and 7B are a cross-sectional view and a partially enlarged cross-sectional view illustrating a state in which a cover member is joined to an opening of the hollow material main body.

FIG. 8 is a sectional view of a hollow material body according to a third embodiment of the present invention.

FIG. 9 is a cross-sectional view of the hollow member main body and the cover member that have been subjected to the development processing.

FIGS. 10A and 10B are a cross-sectional view and a partially enlarged cross-sectional view illustrating a state in which a cover member is joined to an opening of the hollow material main body.

FIG. 11 is an enlarged sectional view showing a modification of the cover member.
(A) is a first modification, (b) is a second modification, and (c) is a third modification.

FIG. 12 is an explanatory perspective view of a hollow member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Hollow material main body 2 ... One plate-shaped part (1st plate-shaped part) for forming one outer plate part 3 ... Plate-shaped part (second plate-shaped part) for forming the other outer plate part 4 ... Partition wall formation 6 Rib 6 Opening 10 Cover member 12 Support wall 20 Joining tool 31 Hollow material 32 One outer plate (first outer plate) 32a Flat portion 33 Other outer plate (Second outer plate portion) 33a: Flat portion 34: Partition portion 35: Hollow portion A: Worked portion to be developed W: Joined portion

 ──────────────────────────────────────────────────の Continued on the front page (72) Mitsuo Hattori Inventor F-term (reference) 4E029 AA06 EA01 EA02 4E067 BG02 4E087 BA04 CA21 DB01 DB11 DB24 HB01

Claims (4)

[Claims] 1. Two outer plate portions (32) and (33) having flat portions arranged in parallel and separated from each other, and a plurality of partition portions (34) partitioning a space between the two outer plate portions. Is a method for producing a hollow material (31) formed continuously in the longitudinal direction, comprising a plurality of unprocessed portions (A) each having a bent portion at an intermediate portion in a width direction. One plate-shaped part for forming an outer plate part (2)
A rib portion (4) for forming a partition portion; and a plate-shaped portion (3) for forming an outer plate portion having an opening (6) formed at a portion facing the portion to be processed (A). The hollow material body (1) having the following structure is manufactured by extrusion molding, and after the developed portion (A) of the hollow material body is flattened, the cover member for closing the opening is formed in the opening (6). (10) A method for producing a hollow material, comprising covering and joining. 2. The method for manufacturing a hollow member according to claim 1, wherein the opening (6) is formed in a portion facing the outside of the portion (A) to be processed. 3. The method for manufacturing a hollow member according to claim 1, wherein the ribs (4) are arranged in a truss shape. 4. The cover member (10) includes support wall portions (12), (13), and (14) for abuttingly supporting the plate-shaped portion (2) for forming the one outer plate portion on an inner surface thereof. The method for manufacturing a hollow member according to claim 1, wherein the hollow member is provided.