JP2006169594A - Method for producing aluminum alloy member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing an aluminum alloy member light in weight and having high degree of freedom of shape and excellent strength and corrosion resistance. <P>SOLUTION: A T4-refined material of Al-Mg-Si based aluminum alloy material is used as a blank (Step S1); the blank is press-formed to make a halved bodies (Step S2); successively, after butting both halved bodies by press-forming at their end surfaces, the butted parts are joined to make the member having product shape (Step S3); and by applying a heat treatment to the member, the refining is made to T6 (Step S4) or by applying over-aging treatment to the member, the refining is made to T7. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for producing an aluminum alloy member used as a structural member of a transport device such as an automobile.

  Aluminum alloy materials are lightweight and excellent in recyclability, and are therefore used in structural members for various transport equipment including automobiles. In general, when a structural component such as a frame material is formed of an aluminum alloy material, extrusion molding is used (see, for example, Patent Document 1). In Patent Document 1, the Mg content is 0.40 to 0.40. 0.80% by mass, Si content of 0.50 to 1.0% by mass, consisting of an Al—Mg—Si based aluminum alloy hollow extruded material that has been subjected to aging treatment after press-quenching, has a proof stress of 200 MPa or more, and has a surface An impact-absorbing member is disclosed in which the thickness of the recrystallized layer is 1 to 50% of the thickness, and the crystal grain size in the thickness direction of the surface recrystallized layer is 200 μm or less.

  However, although extrusion molding has the advantage that a hollow member having a complicated cross-sectional shape can be produced by one molding, only a member having the same shape in the longitudinal direction can be produced, so that the applicable parts are limited. There is a problem. Therefore, conventionally, in order to produce an aluminum member having a more complicated shape, a portion having the same shape with respect to the longitudinal direction is produced by extrusion molding, and an aluminum alloy plate is pressed for a portion having the same shape with respect to the longitudinal direction. There is also proposed a method of making a hollow member by welding and joining the extruded profile and a pressed member (for example, see Patent Document 2).

JP 2003-183757 A Japanese Utility Model Publication No. 5-35405

  However, the conventional techniques described above have the following problems. When aluminum alloy materials are welded together as in the suspension arm described in Patent Document 2, the heat-affected zone is softened, resulting in a problem that strength and corrosion resistance are lowered. For the performance of structural members for transportation equipment such as vehicles and automobiles, especially structural members used for the suspension of transportation equipment, not only high strength but also excellent corrosion resistance is an important factor. . For this reason, it is difficult to use the aluminum alloy member manufactured by the conventional method as described in Patent Document 2 as a structural member for a transport aircraft.

  This invention is made | formed in view of this problem, Comprising: It aims at providing the manufacturing method of the aluminum alloy member which is lightweight, has a high freedom degree of shape, and was excellent in intensity | strength and corrosion resistance.

  The method of manufacturing an aluminum alloy member according to the first invention of the present application includes a step of pressing a T4 tempered material of an Al—Mg—Si aluminum alloy material to obtain a pair of halves, and the halves After the abutting at the end face, there are a step of joining the abutting portions to obtain a product-shaped member, and a step of heat-treating the member to make its tempering T6.

  In the present invention, a pair of halves are produced by press-molding a T4 tempered material of an Al—Mg—Si aluminum alloy material, and the halves are joined together to form a product shape. The moldability is excellent, and the degree of freedom in shape is high. Moreover, since the member after joining is heat-processed and the tempering is set to T6, intensity | strength improves and the lightweight and high intensity | strength aluminum alloy member is obtained. In the present invention, T4 and T6 indicating the tempering of the aluminum alloy material are categorized according to JIS standard H0001.

  The method for producing an aluminum alloy member according to the second invention of the present application includes a step of pressing a T4 tempered material of an Al—Mg—Si aluminum alloy material to obtain a pair of halves, and the halves After the abutting at the end face, there is a step of joining the abutting portions to obtain a product-shaped member, and a step of subjecting this member to an overaging treatment to make its temper to T7.

  In the present invention, a pair of halves are produced by press-molding a T4 tempered material of an Al—Mg—Si aluminum alloy material, and the halves are joined together to form a product shape. The moldability is excellent, and the degree of freedom in shape is high. Moreover, since the member after joining is over-aged and its tempering is set to T7, an aluminum alloy member that is lightweight and has excellent corrosion resistance can be obtained. In the present invention, T7 indicating the tempering of the aluminum alloy material is a quality defined in JIS standard H0001.

  The member may be hollow. Thereby, the aluminum alloy hollow member of a complicated shape is obtained. Moreover, the method of joining the said press-formed halves is a friction stir welding, for example. As a result, the heat-affected zone at the joint is reduced, the strength of the joint is improved, and the rise of the surface bead can be reduced.

  According to the present invention, since the halves obtained by press-molding the T4 tempered material of the Al-Mg-Si-based aluminum alloy material are joined to form a product-shaped member, the formability and the shape freedom are improved. Furthermore, since the tempering of the member is set to T6 or T7 by the treatment after joining, a high-strength, excellent corrosion resistance and lightweight aluminum alloy member can be obtained.

  Hereinafter, a method for producing an aluminum alloy member according to an embodiment of the present invention will be specifically described with reference to the accompanying drawings. First, the manufacturing method of the aluminum alloy material which concerns on the 1st Embodiment of this invention is demonstrated. FIG. 1 is a flowchart showing a method for manufacturing an aluminum alloy member of the present embodiment, and FIG. 2 is a perspective view showing an aluminum alloy member manufactured by the method shown in FIG. As shown in FIG. 1, in the aluminum alloy member manufacturing method of the present embodiment, first, a T4 tempered material of an Al—Mg—Si (6000) aluminum alloy material is prepared as a material (step S1). Then, this material is press-molded to produce halves 2 and 3 having the shape shown in FIG. 2 (step S2). Since press molding can be made with members having different cross-sectional areas and cross-sectional shapes in the longitudinal direction, which is difficult with extrusion molding, and partial processing such as drilling can be performed at the same time as molding, The member having the shape having the holes 5 can also be produced in a single molding step.

  The Al—Mg—Si-based aluminum alloy material is an alloy material that has excellent formability and high strength. For example, a T4 tempered material of an Al—Mg—Si based aluminum alloy material is a material which has been subjected to a natural aging without performing cold working after the solution treatment of the Al—Mg—Si based aluminum alloy material. Is excellent and good moldability is obtained. In addition, it is known that the strength of the T4 tempered material is improved by quenching and aging treatment. Furthermore, the Al—Mg—Si-based aluminum alloy material is excellent in corrosion resistance and recyclability.

  Next, as shown in FIG. 2, the halves 2 and 3 produced in step S2 are joined together along the abutting surface 4 after abutting the ends, and a product shape, that is, a hollow part is provided. It is set as the member 1 of the cylindrical closed cross-section structure (step S3). As a joining method at that time, arc welding, laser welding, friction stir welding, or the like can be applied. FIG. 3A is a cross-sectional view showing a butt portion of the halves 2 and 3, and FIG. 3B is a cross-sectional view showing a state when the butt portion shown in FIG. 3A is arc welded. FIG. 3C is a cross-sectional view showing a state when friction stir welding is performed. As shown in FIG. 3C, the friction stir welding is performed by inserting the pin portion 11a into the abutting portion while rotating the welding tool 11, and moving the welding tool 11 along the abutting surface 4 in this state. This is a method of joining the butted portions of the halves 2 and 3 which are members to be joined. In this friction stir welding, as shown in FIG. 3 (b), an arc 9 is generated between the welding wire 8 and the halves 2 and 3, and the torch 10 is moved along the butt surface 4 in this state. Thus, unlike arc welding in which the butted portions of the halves 2 and 3 are melted and joined, the materials to be joined (half halves 2 and 3) are joined without melting, so the heat affected zone 7 is small. There is almost no swell of the bead 6 on the surface. Therefore, when joining the half body 2 and the half body 3, it is preferable to apply friction stir welding.

  Next, the bonded member 1 is subjected to heat treatment, and the tempering is set to T6 (step S4). As heat treatment conditions at that time, the treatment temperature is, for example, 180 ° C., and the treatment time is, for example, 18 hours. Thereby, the intensity | strength of the member 1 improves and rigidity increases.

  In the manufacturing method of the aluminum alloy member of this embodiment, since the T4 tempered material of an Al-Mg-Si type aluminum alloy material is used as a raw material, the moldability is excellent. Moreover, since a pair of halves obtained by press-molding this material are joined together to form a product-shaped member, the degree of freedom in shape is higher than that of a conventional method using extrusion molding. Furthermore, since the member after joining is heat-treated and the tempering is set to T6, a lightweight and high-strength aluminum alloy member can be obtained.

  Next, the manufacturing method of the aluminum alloy member of the 2nd Embodiment of this invention is demonstrated. FIG. 4 is a flowchart showing the method for manufacturing the aluminum alloy member of the present embodiment. As shown in FIG. 4, in the manufacturing method of the aluminum alloy member of the present embodiment, as in the first embodiment, first, as a material, an Al—Mg—Si (6000 series) aluminum alloy material is used. A T4 tempered material is prepared (step S11), and this material is press-molded to produce halves 2 and 3 having the shape shown in FIG. 2 (step S12). Next, the halves 2 and 3 produced in step S12 are joined together along the abutting surface 4 after abutting the ends thereof to form a member 1 having a cylindrical closed cross-sectional structure having a hollow part. (Step S13). And the over-aging process is performed with respect to the member 1 after joining, and the tempering is set to T7 (step S14). As processing conditions at that time, the processing temperature is, for example, 200 ° C., and the processing time is, for example, 18 hours. In addition, the structure other than the above in the manufacturing method of the aluminum alloy member of this embodiment is the same as that of the above-mentioned 1st Embodiment.

  In the manufacturing method of the aluminum alloy member of this embodiment, since the T4 tempered material of an Al-Mg-Si type aluminum alloy material is used as a raw material, the moldability is excellent. Moreover, since a pair of halves obtained by press-molding this material are joined together to form a product-shaped member, the degree of freedom in shape is higher than that of a conventional method using extrusion molding. Furthermore, since the member 1 after joining is over-aged and its tempering is set to T7, the corrosion resistance can be improved as compared with the aluminum alloy member manufactured by the conventional method.

  The method for producing an aluminum alloy member of the present invention is suitable as a structural member for a transport device such as an automobile.

It is a flowchart figure which shows the manufacturing method of the aluminum alloy member of the 1st Embodiment of this invention. It is a perspective view which shows the aluminum alloy member manufactured by the method shown in FIG. (A) is sectional drawing which shows the butt | matching part of the halves 2 and 3, (b) is sectional drawing which shows a state when arc-welding the butt | matching part shown to (a), (c) is friction It is sectional drawing which shows a state when stirring joining. It is a flowchart figure which shows the manufacturing method of the aluminum alloy member of the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1; Member 2,3; Half part 4; Butting surface 5; Hole 6; Bead 7; Heat affected zone 8; Welding wire 9; Arc 10; Torch 11; Joining tool 11a;

Claims (4)

A step of press-molding a T4 tempered material of an Al-Mg-Si-based aluminum alloy material to obtain a pair of halves, and abutting the halves together at their end faces; A method for producing an aluminum alloy member, comprising: a step of obtaining a product-shaped member; and a step of heat-treating the member to change the tempering to T6. A step of press-molding a T4 tempered material of an Al-Mg-Si-based aluminum alloy material to obtain a pair of halves, and abutting the halves together at their end faces; A method for producing an aluminum alloy member, comprising: a step of obtaining a product-shaped member; and a step of subjecting the member to an overaging treatment to change the tempering to T7. The said member is hollow, The manufacturing method of the aluminum alloy member of Claim 1 or 2 characterized by the above-mentioned. The method for producing an aluminum alloy member according to any one of claims 1 to 3, wherein the press-formed halves are joined by friction stir welding.

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