JPH04361833A - Method for reinforcing part to be joined in intermediate part in hollow bending shape - Google Patents

Abstract

PURPOSE:To obtain a reinforced structure having good outward appearance by executing bending work to a shape bringing into the fixed shape after inserting and setting a faucet joint core material into position at joint part of a hollow part in the shape under straight condition. CONSTITUTION:The faucet joint core material 3 inserted into the hollow part in the hollow shaped material 4 under fitting condition, is inserted from one end opening part of the straight hollow shape 4 before executing the bending work and set to the joint planned position in the shape 2 for joining. The faucet joint core material 3 is fixed in the shape 4 with frequency induction brazing. After that, the bending work is executed to the straight shape 4 and to the reinforced part 5 to be joined, tip part of the hollow shaped material 2 for joining is joined. The reinforced condition of the reinforced part in the bending shape can not be observed from the outer part and end reinforced structure having good outward appearance can be obtd.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reinforcing a welded intermediate portion of a hollow bent metal member such as aluminum used for automobile parts, building material parts, and the like.

0002

2. Description of the Related Art In automobile structures, architectural structures, etc., a T-shaped structure, for example, in which another member is joined to the middle part of a hollow bent metal member such as aluminum, is sometimes employed.

[0003] In such cases, conventionally, the most common practice has been to join another member by welding to a predetermined position in the middle of the bent material which has been bent as it is.

0004

[Problem to be Solved by the Invention] However, in the T-shaped structure as described above, stress is likely to be concentrated at the joint, and as a result, there is a risk of damage to the jointed part of the bent member. there were. Therefore, it is necessary to reinforce the area of the bent part to be joined with something stronger, but because the object is a bent part, it is necessary to strengthen it with a suitable material that does not impair the appearance and has good reinforcing workability. There was no way to strengthen it.

SUMMARY OF THE INVENTION In view of this background, an object of the present invention is to provide a method capable of reinforcing the welded portion in the intermediate portion of a hollow bent member with a good appearance and good workability.

[0006]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a spigot core material for reinforcing a welded part that is tightly inserted into a hollow part of a hollow shape material in a straight state before bending. and inserting the spigot core material into the hollow part of the straight shape material to be welded, and then bending the shape material into a predetermined shape. The gist of this paper is a method for reinforcing the intermediate part to be joined.

[0007]

[Operation] In the above method, since the pilot core material is inserted into the hollow portion of the straight shape material before bending, the pilot core material can be placed at a predetermined position within the shape material for reinforcement. Therefore, a reinforcing structure that is not visible from the outside is realized.

[0008]

[Example] Next, the reinforcing method of the present invention will be applied to a hollow curved extruded aluminum material as shown in Fig. 1(e).
1) The part to be joined of the hollow curved member (1) when realizing a T-shaped joint structure in which the tip of another aluminum member (2) for joining is joined at a predetermined position in the middle part in the length direction An example applied to the reinforcing method will be described.

For reinforcement, a spigot core material (3) as shown in FIG. 1(a) is used. This spigot core material (3)
is also made of aluminum and has a short solid profile. As aluminum, A6063, 6061
, 6N01, or aluminum may be used. The shape and size of the cross section of the pilot core material (3) are the cross section of the hollow section of the hollow curved material (1) in the straight state before bending (see Figure 1 (A)). The straight material (4
) is molded so that it can be smoothly inserted into the hollow part (4a) of the tube. In addition, it is preferable to form the hollow part (4a) of the mold material (4) so that there is a gap of, for example, about 0.1 mm on one side. Further, the outer periphery of this spigot core material (3) is coated with a brazing material. The material of the spigot core material (3) is the same as the material of the mold material (1), or if the material of the mold material (1) is A6063, the material of the spigot core material (3) is A6061. ) is used in terms of strength. Of course, depending on the required reinforcing strength, a material weaker than the strength of the shape material may be used.

[0010] As shown in Fig. 1(a), the reinforcement is as follows.
Insert the spigot core material (3) through the opening at one end of the straight hollow shape material (4) before bending, and place it at the planned joining position of the joining shape material (2) as shown in the same figure (b). Place it in The pilot core material (3) is connected to the hollow part (4a) of the mold material (4).
) is formed slightly smaller than the mold material (4
) is a straight material before bending, so it can be easily inserted.

[0011] Thereafter, the spigot core material (3) is fixed at the above-mentioned position in the hollow part (4a) of the straight member (4) by high-frequency brazing. This is because the spigot core material (3) does not shift position after placing the spigot core material (3) until the end of the bending process on the shape material (4) as described later, or after the bending process. The purpose is to do so.

[0012] Thereafter, the straight member (4) is
As shown in c), bending is performed in a predetermined manner. This bending process can be performed using various bending machines, but here, a three-dimensional bending machine called a so-called multi-bender is used.

As shown in FIG. 3, this bending device includes a fixed mold (6) having a workpiece through hole (6a), and is disposed in front of the fixed mold (6). A movable mold (7), which also has a workpiece conduction hole (7a) and is supported so as to be able to be turned and displaced three-dimensionally, and a workpiece placed at a rear position of a fixed mold (6) are connected to both molds. Type (6)
The main component is a workpiece feeder (8) with a pusher or the like that connects the workpiece through holes (6a) and (7a) in (7), and the work feeder (8) feeds the workpiece through both through holes (6a) and (7a). By turning and displacing the movable mold (7) while electrically conducting to the workpiece (7a), the workpiece is bent using the fixed mold (6) as a fulcrum, and is formed into a predetermined curved shape.

[0014] Using this bending device, a straight profile (4) having a pilot core material (3) installed therein is bent. During this bending process, the pilot core material (3) is brazed to a predetermined position within the hollow part (4a) of the mold material (4), so that it maintains its initial placement position without causing any displacement. Become.

[0015] Through this bending process, the shape material (4)
The inside of the hollow part (4a) undergoes deformation, and the influence of this deformation extends to the spigot core material (3), which becomes the core material (3) shown in Figure 1 (
As shown in (d), an even stronger fixed state is achieved. As a result, the welded part (5) of the bent member (1)
) reinforcement is achieved.

[0016] The tip of the hollow member (2) for joining is joined to the reinforced part (5) of the curved hollow member (1) to be joined. It is preferable to employ a mechanical fitting method for this joining. That is, a predetermined length of a pair of opposing side walls at the tip of the joining hollow member (2) is removed, and a large number of irregularities (9) are formed on the opposing surfaces of the remaining pair of side walls (2a) (2a). ) to form. And Figure 1 (d)
As shown in FIG. 2, the part (5) to be joined of the bent member (1) is placed between the both side walls (2a) (2a). While maintaining this state, the two walls (2a) are caulked onto the outer peripheral surface of the part to be joined (5) of the bent member (1) by, for example, the Magneform method. As a result, the joining section (2) is firmly joined to the bent section (1). In addition, due to the presence of the spigot core material (3), there is no occurrence of crushing of the part to be joined (5) due to caulking, and the spigot core material (3)
The fixed state of 3) becomes even stronger.

[0017] In the above embodiment, the spigot core material (3
) is fixed by brazing, but brazing may be omitted in cases where the fixed state of the spigot core material (3) is realized by bending. Moreover, it goes without saying that a hollow material may be used as the core material for the spigot.

[0018]

[Effects of the Invention] According to the above, the reinforcing method of the present invention is as follows:
Prepare a spigot core material for reinforcing the parts to be joined that is tightly inserted into the hollow part of the straight hollow shape material before bending, and insert the spigot core material into the hollow part of the straight shape material. After being inserted into the position of the part to be joined, the molded material is bent into a predetermined shape. Therefore,
The reinforcing state of the reinforced portion of the obtained bent member is not visible from the outside, and a reinforced structure with good appearance can be realized. In addition, reinforcement can be performed with a simple operation of inserting the pilot core material into the hollow portion of the straight shape, and the reinforcement can be performed with good workability.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing each step of a reinforcing method and a joining method.

FIG. 2 is a cross-sectional view of a joint.

FIG. 3 is a partially sectional side view of the bending device.

[Explanation of symbols]

1...Hollow curved material 3...Inlay core material 4...Straight material

Claims (1)

[Claims] Claim 1: Prepare a pilot core material for reinforcing the parts to be joined, which is inserted snugly into the hollow part of a hollow shape material in a straight state before bending, and insert the pilot core material in the straight state. A method for reinforcing a welded intermediate portion of a hollow curved shape material, the method comprising: inserting the shape material into a position of the welded portion in the hollow portion of the shape material, and then bending the shape material into a predetermined shape.