JPH07284856A - Manufacture of bent article - Google Patents

Abstract

PURPOSE:To manufacture a symmetrical article, without the need of a large- scale working equipment, for a reduced time in bending, under an easy parts control in the manufacturing processes, and with a superior shape accuracy. CONSTITUTION:A notch 3 is formed in the center in the longitudinal direction of a work 2 of an aluminum hollow extruded material, and the work is folded over at the notched part 3, in which state a two-dimensional bending is performed, on both sides of the work parts 7, 9 holding the folded part of the work 2 in between, integrally within a plane vertically crossing in the parallel direction of the work part; after that, the work 2 is folded back at the folding part so as to make notched faces 10, 11 abutted on each other, and welding 12 is performed.

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 bent product made of various metals such as aluminum.

[0002]

2. Description of the Related Art For example, the length in the bending direction is 6000 m.
When manufacturing a bent product such as a large U-shaped ship aggregate of up to m, it is possible to bend one long work corresponding to the length of the bent product. ,
It is necessary to prepare a considerably large bending apparatus, which is difficult in terms of equipment and space, and the bending operation requires a lot of time. Therefore, conventionally, a method for manufacturing a bent product has been proposed in which a plurality of relatively short work pieces, for example, two work pieces that are separated and independent from each other are used, and each work piece is bent, and these pieces are joined in a butt state. There is.

[0003]

However, as described above, in the method of bending a plurality of works individually and joining them to manufacture a bent product, it is possible to avoid increasing the size of the bending equipment. On the other hand, on the other hand, the problem that it takes a lot of time to bend a work remains to be solved. In addition, the increase in the number of parts causes a problem that it takes a lot of time and effort to manage the parts in the manufacturing process.

Further, particularly in the production of a bent product having symmetry such as a ship aggregate, the above-mentioned method is used.
There was also the problem that it was very difficult to obtain symmetry accuracy.

In view of the above-mentioned conventional problems, the present invention can manufacture bent products without increasing the size of the bending equipment, and can shorten the bending time as well as the manufacturing process. It is an object of the present invention to provide a method for manufacturing a bent product, which enables easy management of parts in.

[0006]

For the above-mentioned purpose, the first
According to the invention, a work is folded back at an intermediate portion in the longitudinal direction, and in that state, both work parts sandwiching the folded back portion of the work are integrally bent, and then the work is folded back at the folded back portion. The gist is a method of manufacturing a bent product characterized by the following.

According to a second aspect of the present invention, a cut portion is formed in the work at an intermediate portion in the longitudinal direction, the cut portion is folded back, and in that state, both work portions sandwiching the cut portion of the work are integrally bent. A gist of the present invention is a method for manufacturing a bent product, which is characterized in that after the work is performed, the work is folded back at the cut portion to bring the cut surfaces into a butted state, and the butted portions are joined.

[0008]

In each of the above inventions, the work to be bent is subjected to the bending work by folding the work in a folded state, so that the work to be bent is downsized, and the equipment for the bending work has a large size corresponding to the size of the bent product. It doesn't have to be a thing.
In addition, the time required for the bending process is shortened by integrally bending both side work parts sandwiching the folded-back portion with respect to the folded work. In addition, the work is not cut / separated only by being folded back but is maintained in the connected state from beginning to end, so that the number of parts is not increased and parts management in the manufacturing process of bent parts is facilitated.

According to the second aspect of the invention, a cut portion is formed in the work, the work piece is folded back at the cut portion, and after bending,
The work is folded back at the notch so that the notches are brought into contact with each other.By utilizing the joints of the notch, both work parts sandwiching the notch can be accurately and easily and properly abutted. It can be put into a state, and a joint portion having excellent butting accuracy can be easily obtained.

[0010]

Embodiments of the present invention will be described below.

The object to be manufactured is a bent product (1) made of an aluminum hollow extruded material as shown in FIG. This bent product (1) has a U-shape having symmetry in the bent shape. For example, bent products for ship aggregates. The size is, for example, about 400 in the bending direction.
The length a of one side is 30 mm and the length b of the other side is 60 mm in a rectangular cross section having a chamfered slope.
Is designed to.

The curved product (1) is manufactured as follows.

That is, as shown in FIG. 1 (a), as a work for the bent product (1), it has the same cross-sectional shape and size as the bent product (1), and the length thereof is almost the same as that of the bent product (1). A straight work (2) made of a hollow extrusion mold made of aluminum of a corresponding length is prepared. As such a work (2), for example, T1 processed or T5 processed A
An extrusion mold made of 6063 aluminum alloy is used.

Then, as shown in FIG. 1 (b-1), a notch (3) is made at a central position in the length direction of the work (2). The notch (3) is, as shown in FIG. 1 (b-2), any one of the plane walls (5) of the work (2).
The work portions (7) and (9) on both sides of the cut portion (3) are connected to each other at the connecting portion (6) corresponding to.

Thereafter, as shown in FIG.
The work (2) is folded back at the position of the cut portion (3), and the work portions (7) on both sides sandwiching the cut portion (3).
(9) are placed in parallel with each other.

Then, as shown in FIG. 2D, the work (2) is bent. In this embodiment, in consideration of the bent shape of the bent product (1), the bending work is performed by two-dimensionally bending the work (2) in the folded state in a plane orthogonal to the parallel direction of the work parts (7) and (9). The work is performed so that the work (2) has a curved shape corresponding to the curved shape on one side of the curved product (1).

Then, the bent work (2)
Work pieces (7) (9) on both sides of the notch (3)
2 is rotated and unfolded around the connecting portion (6) in the cut portion and folded back, and as shown in FIG. 2 (e), the cut surfaces (10) and (11) are aligned with each other to form both work parts. (7) (9) are brought into a butted state.

Then, finally, as shown in FIGS. 2 (f-1) and (f-2), the welding (12) is applied to the abutting portion.
Then, the two work parts (7) and (9) are joined together. The joining by welding or the like may be performed over the entire circumference including the connecting portion (6) or may be performed only in a part of the circumferential direction. As described above, a U-shaped bent product (1) having symmetry as shown in FIG. 3 is manufactured.

As described above, according to the above-mentioned manufacturing method, since the work (2) is folded and bent, the work (2) to be bent is downsized and bent. The product (1) can be manufactured without increasing the size of the bending equipment. Moreover, since the work parts (7) and (9) on both sides of the work (2) folded back in this way are sandwiched by the notches (3), they are integrally bent. It can be shortened and the bending efficiency can be improved. In addition, the work (2) is not cut and separated only by turning it back, but is maintained in the connected state from beginning to end.
Therefore, the number of parts is not increased, and therefore parts management in bending work and joining work can be performed very easily.

Further, a cut portion (3) is formed in the work (2) and folded back at the cut portion (3). After bending, the work (2) is folded back at the cut portion (3) and cut surface. (10) Since the (11) are made to abut against each other, after the bending process, the cut surfaces (10) and (11) can be very easily used by utilizing the connecting portion (6) in the cut portion (3). Moreover, the butted state can be brought about with high precision, and the joining portion (12) with excellent butting precision can be easily obtained.

Further, in the production of the bent product (1) having the above-mentioned bent shape symmetry, the work (2) in the folded state is subjected to the bending work, so that both work parts (7) ( 9) is bent with good symmetry, the symmetry accuracy of the bent product (1) can be made very high, and the symmetric bent product (1) with high shape accuracy can be manufactured.

In the above embodiment, the notch (3) is formed at the central position of the work (2) in the longitudinal direction, but other than the central position depending on the shape of the bent product to be manufactured. You may make a notch and fold it back in other intermediate parts. Further, in the above-mentioned embodiment, the cut (3) is put in one place and the work (2) is folded in two, but in addition, the cut is made in a plurality of places so that the work (3) is folded in three or more. You may
Further, it goes without saying that the present invention can be used for manufacturing a bent product having no symmetry. Further, the work is not limited to a hollow material, and may be a solid material or the like.

[0023]

As described above, in the method for manufacturing a bent product according to the first and second aspects of the present invention, since the bending work is performed with the work folded back, the work to be bent is small. It is possible to manufacture bent products without increasing the size of bending equipment. Moreover, since the work pieces folded in this manner are bent integrally on both sides of the work piece that sandwiches the turn-back portion, the time required for the bending work can be shortened and the bending work efficiency can be improved. it can. In addition, the work is cut by simply folding it back,
Since they are not separated and are maintained in the connected state from beginning to end, the number of parts is not increased, and therefore parts management in the manufacturing process of bent parts can be facilitated.

Further, in the method for manufacturing a bent product according to the second aspect of the present invention, a cut portion is formed in the work, and the work is folded back at the cut portion. After bending, the work is folded back at the turn back portion and the cut surfaces are brought into abutment with each other. Therefore, compared to the conventional case where curved works that are separated and independent from each other are brought into contact with each other, both work portions sandwiching the cut portion are accurately and easily brought into proper contact with each other. Therefore, it is possible to easily obtain a joint portion having high butt precision.

[Brief description of drawings]

FIG. 1 is a diagram showing a manufacturing process according to an embodiment, and FIG.
Is a perspective view of the work, FIG. (B-1) is a perspective view of the work in which the notch is formed, and FIG. (B-2) shows the notch, and is a cross section taken along line I-I of FIG. The arrow view and FIG. 3C are perspective views of the work piece in the folded state.

FIG. 2 shows the same manufacturing process. FIG. 2D is a perspective view of a work piece that has been bent, FIG. 2E is a side view of the work piece in a folded state, and FIG. A perspective view of the bent product, FIG. (F-2) is a sectional view taken along the line II-II in FIG.

FIG. 3 (a) is a front view of a bent product, and FIG. 3 (b) is a cross-sectional view of the bent product and is taken along line III-II of FIG.
It is an I line sectional view.

[Explanation of symbols]

 1 ... Bent product 2 ... Work 3 ... Notch 6 ... Connecting part 7, 9 ... Work part 10, 11 ... Notch surface 12 ... Weld part (joint part)

Claims (2)

[Claims] 1. A work is folded back at an intermediate portion in the longitudinal direction, and in that state, both work parts sandwiching the folded back portion of the work are integrally bent, and then the work is folded at the folded back portion. A method for manufacturing a bent product, which is characterized by returning the product. 2. A notch is formed in an intermediate portion in the lengthwise direction of the work, the work is folded back at the notch, and in that state, both work parts sandwiching the notch of the work are integrally bent, and then the work is performed. A method for manufacturing a bent product, which is characterized in that the work is folded back at the cut portion to bring the cut surfaces into a butted state, and the butted portions are joined.