JPH09323178A - Joining structure of members each other - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the joining structure by which a joined part excellent in reliability in strength and quality is realized in good productivity and design freedom in the joining direction of members each other is enlarged. SOLUTION: One member 1 is made of aluminum extruded stock and the other member 2 is made of aluminum die cast stock, the end part of extruded member 1 is inserted/fitted in the inserting hole part 2c for fitting arranged in the die cast member 2, both members 1, 2 are integrally joined at the fitting part by friction welding method to soften/join with friction heat.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining structure of members made of metal such as aluminum which can be used in various structures such as a frame structure of a space frame of an automobile and a frame structure of a building structure.

[0002] In this specification, the term "aluminum" is used to include its alloys.

[0003]

2. Description of the Related Art For example, an automobile space frame is
It is configured by joining a large number of metal wrought materials, and the joining is performed by arc welding such as MIG or TIG, or mechanical fastening such as bolting.

[0004]

However, in the above-described joining structure by arc welding, the strength of the welded heat-affected zone is reduced, and this determines the strength of the entire joining structure material, which reduces the degree of freedom in design. It had the drawback of falling. Further, when the member is made of aluminum, for example, there is a limit to the range of alloys that can be arc-welded,
It is difficult to adopt aluminum alloys such as A6000 series and A2000 series, and this also has a drawback that the degree of freedom in design is limited. Further, there is a drawback that stress concentration is likely to occur at the toe portion, which makes it weak against fatigue. Also,
There are some cases where welding defects such as cracks and blowholes may occur in the welded portion, and there is also a troublesome problem in terms of quality of the jointed portion. In particular, in the case of aluminum alloys containing elements such as Mg and Zn, there is a disadvantage that these elements evaporate in the welded portion during welding. Furthermore, in the case of arc welding, a welding bead is produced, and when the bead needs to be removed,
There is also a drawback that the finishing process for removing it is troublesome. Furthermore, in the case of arc welding, a large strain is generated,
There is also a problem that it takes a lot of time and effort to correct distortion after welding, and it is not possible to manufacture bonded products with high productivity.

Further, in the joining structure by mechanical fastening,
In the case of bolt tightening, there is a problem that it is necessary to make a bolt hole, stress concentration is likely to occur there, and design consideration is required.

Furthermore, since the wrought materials are joined to each other, there is a limit to the degree of freedom in the joining direction of the other member with respect to one member, and the members are joined in a desired direction by design. It also had the drawback of being limited.

In view of the above-mentioned conventional problems, the present invention can realize a joint having excellent strength and reliability, and can form a good quality joint without defects. It can be manufactured with high productivity, and
An object of the present invention is to provide a joining structure of members that can increase the degree of freedom in the joining direction of the members.

[0008]

[Means for Solving the Problems] The above problem is that one member is made of a metal wrought material and the other member is made of a metal casting material, and at least one of these members is fitted with the other member. By a friction welding method in which a fitting portion for mating is provided, both members are combined in a fitted state in the fitting portion, and the members are softened and joined by friction heat,
This is solved by a joining structure of members that is joined and integrated in the fitting portion.

That is, in the present joining structure, the metal members are joined and integrated at the fitting portion by the friction welding method which does not involve melting of the joining portion. In addition to solving the problem of strength reduction due to thermal effects such as in the case, it is also possible to join members made of materials that are difficult to arc-weld and widen the material range of the members.
The problem of stress concentration due to drilling in the case of mechanical fastening is also eliminated, and therefore a joint having excellent strength reliability can be obtained while increasing the degree of freedom in designing the member base material.

In addition, the problems of welding defects and stress concentration at the toe at the time of arc welding are eliminated, and from this aspect, a joint having excellent strength reliability and quality is realized. It

Further, a bead unlike in the case of arc welding is not generated, a troublesome finishing process for removing the bead is eliminated, and a troublesome straightening correction such as in the case of arc welding is unnecessary, which reduces the number of steps. The joint structure can be obtained with good productivity.

Further, according to the present invention, in a joining structure by a friction welding method in which members are softened by friction heat and joined, one of the members is a wrought material and the other is a casting material having a large degree of freedom in shape design. Since one member made of wrought material is joined to the other member made of cast material with a high degree of freedom in direction, it is difficult to realize by joining wrought materials up to now. It is very easy to realize the joining with the directionality which was impossible.

[0013]

Next, an embodiment of the present invention will be described.

The joining structure of metal members according to the present embodiment is adopted in the space frame structure of an automobile, but the joining structure of the present invention is not limited to this, and it can be used for building structures and the like. It goes without saying that it can be widely adopted in various structures.

In the joining structure of members shown in FIG. 1 (a), (1) ... Is an aluminum extrusion die material as a wrought material, and (2) is an aluminum die casting material as a casting material. The members (1) and (2) may be made of an A6000 series or A2000 series aluminum alloy or the like, which is difficult to weld. Fig. 1 (a)
As shown in (b), the die-cast material (2) is provided with a plurality of protrusions (2b) ... on its main body (2a) in a predetermined direction, and each protrusion (2b). Are provided with fitting insertion hole portions (2c) with a predetermined depth so that the ends of the extruded mold materials (1) can be fitted and fitted properly. Each extruded die material (1) is inserted and fitted at its end into the fitting insertion hole portion (2c) of the die casting material (2), whereby the die casting material (2) is designed as designed. It is directed in the direction of and is combined in a fit state without play.

The joining portion (3) between the extruded mold materials (1) ... And the die casting material (2) is formed by a friction welding method in which the fitting portions are heated and softened by friction heat and joined. . This friction welding method is a kind of solid-phase joining method for joining without joining the joining portion, and friction heat is applied to the contact portion between the members (1) and (2) in the fitting portion or a portion in the vicinity thereof to be softened. Then, if necessary, that portion is pressed to join.

When the friction welding method is applied, the members (1) and (2) may be frictionally joined to each other, but the following method is practical.
That is, as shown in FIGS. 2A and 2B, the frictional heat imparting operation body such as the shaft (4) rotated at a high speed is provided with a boundary portion or a boundary between the members (1) and (2) in the fitting portion. This is a method of bringing the parts (1) and (2) into contact with each other or a part in the vicinity thereof by softening and joining the parts (1) and (2) with each other by bringing the parts into close contact with each other under a predetermined pressure. In this way, for example, when using the high-speed rotating shaft (4), as shown in the figure, for example, as shown in FIG. This can be done by moving the shaft (4) around the entire circumference of the protrusion (2a).

In this friction welding, the member (1)
(2) When the contact portions of the two members are pressed against each other, the pressure is applied by pressing the above-described high-speed rotating shaft (4) against the member (2), or the member (1).
It may be performed by applying an external force to (2) separately.

In the joining structure of members according to the above-mentioned embodiment, the main body (2a) is provided with the projection (2b) oriented in a predetermined direction, and the projection (2b) is fitted with a predetermined depth. The die-cast material (2) provided with the insertion hole (2c) is provided as a constituent member, and the extrusion mold material (1) is inserted into the fitting insertion hole (2c) of the protrusion (2b) of the die-cast material (2). The ends are fitted and fitted properly to each other, and the die-cast material (2) and the extrusion mold material (1) are joined and integrated by a friction welding method in which the fitting portions soften and are joined by friction heat. Therefore, one member (1) is bonded to the other member (2) with a large degree of freedom in direction and appropriately joined in a desired direction due to the degree of freedom in designing the die casting material. can do.

Particularly, as described above, the die-cast material (2)
Is adopted as an intermediate joint member for connecting a plurality of extruded materials (1) ..., the plurality of projections (2b) ... are respectively projected in desired directions, and each projection (2b) is projected. )
The intermediate joint member (2) having a complicated shape in which the fitting insertion hole (2c) is provided in the ... can also be easily formed by die casting, and each extruded material (1) ... becomes the die cast material (2). On the other hand, it is possible to very easily realize a proper joint portion which is joined in various desired directions.

Although one embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications can be made. For example, the number of joined extruded materials (1) to the die cast material (2) is not limited, and may be one, and the extruded material (1) to the die cast material (2) ...
The joining direction can also be designed in various directions by adopting various die-cast moldable shapes for the die-cast material (2), and there is no particular limitation. Extruded material (1)
The cross-sectional shape thereof may be a circular shape or a modified cross-section other than the circular shape, and the cross-section of the insertion hole portion (2c) of the die-cast material (2) may have a cross-sectional shape corresponding thereto. In the above embodiment, the die-cast material (2) is provided with the fitting insertion hole (2c) for inserting the end portion of the extruded material (1), which is shown in FIG. So that
Prepare a die-cast material (2) provided with an insertion protrusion (2d) by die-cast molding, and insert this insertion protrusion (2d) into the end of the hollow extruded material (1) in a fitted state, A joining structure in which both members (1) and (2) are joined and integrated (3) by a friction welding method by friction heat softening may be used. In the above embodiment, one member (1) ... Is an extruded material and the other member (2) is a die cast material. However, the extruded material is an example of a wrought material and the die cast material is an example of a cast material. However, other wrought materials and other casting materials may be adopted. Further, although aluminum members are used as the members (1) and (2) in the above embodiment, these members (1) and (2) are used.
(2) may be made of various metal materials including other iron-based materials.

[0022]

As described above, the joining structure of members according to the present invention is a structure in which metallic members are joined and integrated by a friction welding method of softening and joining by friction heat.
In addition to solving the problem of strength reduction due to the effect of heat, such as in the case of arc welding of IG, TIG, etc., the range of the material of the member is expanded, and the problem of stress concentration due to drilling in the case of mechanical fastening Therefore, it is possible to realize a joint having excellent strength and reliability, and it is possible to expand the degree of freedom in designing the structure and the range of application. In addition, the problem of welding defects in the case of arc welding, the problem of stress concentration at the toe, etc. are eliminated, and from this aspect as well, it is possible to realize a joint with excellent strength reliability and quality. . Furthermore, the beading that occurs in the case of arc welding does not occur, the troublesome finishing process for removing it is eliminated, and the troublesome straightening of strain is also unnecessary. You can

Further, according to the present invention, in the joining structure by the friction welding method, one of the members is made of the wrought material and the other is made of the cast material having a large degree of freedom in shape design. One member can be joined to the other member by casting in any direction with a high degree of freedom in the direction, which was difficult or impossible to achieve with the conventional joint structure of wrought materials. A directional joint can be realized very easily.

[Brief description of drawings]

FIG. 1 shows a joining structure of members according to an embodiment, FIG. 1A is a perspective view, and FIG. 1B is a perspective view showing members separated from each other.

2A and 2B show a joining method of the joining portion, wherein FIG. 2A is a sectional view and FIG. 2B is a sectional view taken along line II-II of FIG. 2A.

3A and 3B show a joint portion of a joint structure according to another embodiment, in which FIG. 3A is a cross-sectional view and FIG. 3B is III in FIG.
It is a III-line sectional view.

[Explanation of symbols]

 1 ... Extruded material (expanded material) 2 ... Die cast material (cast material) 2c ... Insertion hole for fitting 3 ... Joined portion

Claims (1)

[Claims] 1. One member is made of a metal wrought material, the other member is made of a metal casting material, and a fitting portion for fitting at least one member of these members to the other member is provided. The two members are combined in a fitted state in the fitting portion, and the members are joined and integrated in the fitting portion by a friction welding method in which the members are softened and joined by friction heat. A structure for joining members to each other.