JPH1128584A - Metal lamination joined body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the metal lamination joined body having sufficient joining strength regardless of a shape/material of members to be joined and having high reliability and stability without generating a strain/an intermetallic compound in joining. SOLUTION: In the metal lamination joined body, in which plural metal layer constituting members 20, 21, 22 are liminated/joined in the thickness direction, a rotating probe 31 is inserted to a lamination boundary face of the laminated metal constituting members 20, 21, 22, the lamination boundary face of the respective metal layer constituting members 20, 21, 22 are subjected to friction/agitation/joining, the metal lamination joined body is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated metal joint used as a structural material such as a core vessel or a component for electric equipment such as a power transmission terminal.

[0002]

2. Description of the Related Art A bonded body in which a plurality of metal members are bonded is sometimes used as the structural material or a component for electric equipment in order to reduce the weight, improve the function, and reduce the cost.

For example, as shown in FIG. 3, members (130), (131), and (132) of the same kind having different wall thicknesses are brought into abutting state in the width direction such that one surface is disposed on the same surface. By melting and joining the butted portions, a necessary portion is made thick to have mechanical strength, while the other portions are made thin to reduce the weight, such as a structural material (101) such as a tailor blank, or shown in FIG. As described above, the stainless steel plate-like member (120), the copper plate-like member (121), and the aluminum plate-like member (122) having the same size are stacked in the thickness direction and the peripheral edge portions are melt-bonded to each other. (101) in which electrical and mechanical functions are shared among the layers. In addition, in order to eliminate the cutting work that has been performed to improve the dimensional accuracy and surface smoothness of the casting, a wrought material is bonded to the surface of the casting, and the dimensional accuracy and surface smoothness are secured by the wrought material. Also, a joined body and the like are used.

[0004]

However, the above-mentioned joints are all manufactured by fusion welding of MIG, TIG, etc., but in these fusion welding methods, as shown in FIG. There is a problem that it is not possible to secure a bonding area larger than the area, or as shown by hatching in FIG. 4, that only the peripheral portion of the superposed plate-like members can be bonded, and the bonding strength of the obtained bonded body is not necessarily It was not enough. In addition, due to the high temperature during fusion welding, distortion and deformation occur in the joined body, and depending on the combination of metals to be joined, intermetallic compounds that mechanically and electrically adversely affect the joined part are produced, so that it was obtained. The joined body lacked reliability and stability with respect to mechanical strength and electrical characteristics. Further, depending on the combination of metals to be joined, there were cases where joining could not be performed by fusion welding.

[0005] The present invention has been made in view of the above problems, and has a sufficient bonding strength irrespective of the shape and material of the members to be bonded, and has a high reliability without distortion and generation of intermetallic compounds. It is an object of the present invention to provide a metal-laminated joined body having properties and stability.

[0006]

In order to achieve the above object, a metal laminated joint according to claim 1 of the present invention comprises:
A metal laminated joined body in which a plurality of metal layer constituent members are overlapped and joined in the thickness direction, and a rotating probe is inserted into a laminated boundary surface of the overlapped metal layer constituent members to form a laminate interface. Are friction stir welded.

According to a second aspect of the present invention, there is provided the metal laminated joint according to the first aspect, wherein at least two of the metal layer constituting members have different planar shapes.

Further, the invention according to claim 3 is the metal-laminated joint according to claim 1 or 2, wherein at least two of the metal layer constituting members have different material types. is there.

The metal laminated joint according to the first aspect is obtained by joining the respective metal layer constituent members in a solid state without melting by friction stir welding which belongs to the category of solid phase joining. Since the temperature at the time of joining is also lower than that of fusion welding, there is no generation of distortion due to thermal effects and no generation of intermetallic compounds that adversely affect mechanically and electrically. Further, since the rotating probe is inserted into the metal layer constituent member and the lamination interface is joined, the interface not exposed on the surface can be joined. Further, an arbitrary bonding area can be obtained by changing the insertion position and the insertion range of the probe, and thus the obtained metal laminated bonded body can have a sufficient bonding strength.

According to a second aspect of the present invention, in the metal laminated joint, the metal layer constituting members having different planar shapes are laminated and joined, for example, the members are laminated and joined only at a portion where mechanical strength is required. The laminated joint is made. For this reason, in addition to the effect of the invention according to claim 1, the metal laminated joint has an effect that sufficient mechanical strength and weight reduction can be realized at the same time and cost can be reduced.

According to a third aspect of the present invention, there is provided a metal laminated joined body in which different materials are laminated on arbitrary layers. For this reason, the metal laminate joined body is the first aspect of the present invention.
Or, in addition to the effect of the invention according to 2, the electric / electrical
This has the effect that mechanical functions and other functions can be shared to achieve higher functions.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a metal laminated joint according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows three metal layer components (20), (21), and (22) having different planar shapes arranged in a laminated state and joined by a joining device (3) to form a metal laminated joint (1). )
Is manufactured.

The metal layer constituting members (20), (21), (2)
2) is a plate-like member having different widths and the same length and thickness. The material type of these constituent members is not particularly limited, such as steel, stainless steel, copper, aluminum, or an alloy thereof, and the manufacturing method thereof is not particularly limited, such as casting or wrought. The combination is also arbitrary, but in the case of this embodiment, the material of the three components is the same wrought aluminum product.

The metal laminated joined body (1) is superposed in the order of narrow width with one end face in the width direction and both end faces in the length direction of the metal layer constituting members (20), (21) and (22) aligned. Then, the probe (31) of the joining device (3) provided with the pin-shaped probe (31) protruding on the end face rotation axis of the large-diameter cylindrical rotor (30) is connected to the metal layer constituent member (2).
0) (21) and (22) are joined together by friction stir welding at the lamination boundary surface. As described above, the one end in the width direction is made thicker by joining, so that a high mechanical strength is imparted to a necessary portion, while the other end is made thinner in a step-like manner, thereby reducing the weight. Have been.

The method for producing the metal laminated joint (1) will be described in more detail.

A joining device (3) shown in FIG. 1 is a joining device for joining metal layer constituent members. A small-diameter pin-shaped probe (31) is provided on an end axis of a large-diameter cylindrical rotor (30). Are protruded and provided integrally. Both the rotor (30) and the probe (31) are metal layer constituent members (20) (2).
1) It is made of a material harder than aluminum constituting (22). Although not shown in the drawings, irregularities for stirring are formed on the peripheral surface of the probe (31).

The three plate-shaped metal layer constituent members (20), (21), and (22) having different widths are aligned at one end in the width direction and both ends in the length direction, and are stacked in ascending order of width. If necessary, a support jig (not shown) may be arranged below the other end of the inverted staircase so as not to rattle at the time of joining.

Next, the rotor (3) of the joining device (3)
The probe (31) is inserted in the overlapping direction from the outermost surfaces of the metal layer constituting members (20), (21), and (22) while integrally rotating the probe (0) and the probe (31). In the portion where three sheets are overlapped, the probe (31) penetrates the uppermost metal layer component (20) and the intermediate metal layer component (21), and the lowermost metal layer component. (2
The process is performed until the process reaches 2). In the portion where the two are superposed, the process is performed until the metal layer constituting member (21) of the intermediate layer is penetrated through the uppermost metal layer constituting member (20). Also,
It is desirable that the flat surface (32) of the rotor (30) on the probe (31) side presses the surface of the uppermost metal layer component (20) with the probe (31) inserted. Then, while maintaining this state, the rotor (30) and the probe (31) are slightly inclined rearward in the moving direction, and the entire length of the metal layer constituent members (20), (21), (22) in the longitudinal direction. Relatively in the width direction.

The frictional heat generated by the rotation of the probe (30) and the rubbing between the metal layer constituting members (20), (21) and (22) or the end face (3) of the rotor (30).
2) The metal layer components (20), (21), (22) in the vicinity of the contact portion with the probe (31) due to frictional heat generated due to the rubbing of the uppermost metal layer component (20).
Is plasticized and softened and agitated by the probe (31), and as the probe (31) moves, the softening and agitating portion receives the traveling pressure of the probe (31) so as to fill the passage groove of the probe (31). Then, after plastically flowing in such a manner as to go backward in the traveling direction of the probe (31), frictional heat is rapidly lost, and cooling and solidification is performed. This phenomenon is sequentially repeated with the movement of the probe (31), and finally the lamination boundary surfaces of the metal layer constituent members (20), (21), (22) are friction stir welded, and the metal laminate joint (1) is obtained. In a portion where the number of laminations differs, for example, the bonding device (3) having a probe length corresponding to the number of laminations may be replaced to accommodate the same. Also, a probe (32) from the end surface (32) of the rotor (30) may be used. 31) may be changed by changing the protruding length.

The metal laminate joined body (1) obtained as described above is composed of the respective metal layer constituting members (20), (21) and (22).
Is joined by the friction stir welding method, which is a solid-state welding method, so that the joining part does not become molten as in the case of fusion welding, and metal that adversely affects the joining strength and electrical characteristics The joined body is free from the formation of inter-compounds or distortion due to thermal effects.

Further, the friction stir welding method for producing the metal laminated joined body (1) uses the probe (31) of the joining apparatus (3).
(20) (21) (2)
Since 2) can be inserted in the thickness direction in a penetrating state and the respective boundary surfaces can be joined, any (for example, in the state where the probe (31) is inserted into the metal layer constituent members (20), (21), (22)) Move it in a meandering shape, or move the probe (3
By inserting 1), a large bonding area can be secured. Therefore, the obtained metal laminated joined body (1) is a joined body having high joining strength.

In this embodiment, the metal layer constituting members (20) and (21) differ only in the planar shape and the same material and the like.
(22) shows the laminated metal joined body (1) joined, but the present invention is not limited to the above embodiment.
Arbitrary combinations can be selected for the shape and material of the metal layer constituting member. For example, as shown in FIG. 2, the metal layer components (20), (21) and (22) have the same shape, the material type of the uppermost metal layer component (20) is stainless steel, and the member of the intermediate layer ( 21) is copper, and the lowermost member (22) is aluminum. The joining device (3) is moved linearly several places to join the metal layer constituent members (20), (21), and (22). The obtained laminated metal joint may be used.

Further, the same kind of metal may be used, and a metal laminated member obtained by joining one of the metal layer constituting members using a casting and the other as a wrought material may be used.

[0025]

According to the first aspect of the present invention, in the metal laminated joint, a plurality of metal layer constituting members are overlapped in the thickness direction, and a probe of the joining apparatus is inserted into the metal layer constituting member.
Since it is obtained by friction stir welding, which is a solid-phase welding, at the lamination boundary surface of each metal layer constituent member, the joining portion does not become a molten state unlike a joined body joined by melt welding, Joined in the phase state. Therefore,
An intermetallic compound that has an adverse effect on the bonding strength and electrical characteristics is not generated at the bonding portion, and the bonded body can be formed without distortion due to heat. Further, since the probe of the joining device is inserted in the overlapping direction from the outermost surface of the metal layer constituent member to join the boundary portion, it is possible to join the boundary portion that is not exposed on the surface, and at the same time, the insertion position and insertion of the probe. By changing the range, an arbitrary bonding area can be obtained, and thus the obtained metal-laminated bonded body can have sufficient bonding strength.

According to the second aspect of the invention, in addition to the effect of the first aspect of the invention, it is possible to reduce the weight and the cost while securing sufficient mechanical strength of the metal laminated joint.

According to the third aspect of the invention, in addition to the effects of the first or second aspect of the invention, each layer can be assigned an electric / mechanical function and other functions and roles. It can be a metal laminate joint having a high commercial value that can be handled.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a manufacturing state of a metal laminated joint according to an embodiment of the present invention.

FIG. 2 is a perspective view showing another embodiment.

FIG. 3 is a perspective view showing a conventional example.

FIG. 4 is a perspective view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Metal laminated joined body 3 ... Joining apparatus 20, 21, 22 ... Metal layer constituent member 30 ... Rotor 31 ... Probe

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takenori Hashimoto 6224, Kaiyamacho, Sakai City Showa Aluminum Co., Ltd.

Claims (3)

[Claims] 1. A metal laminated joined body in which a plurality of metal layer components are overlapped and joined in a thickness direction, and a rotating probe is inserted into a lamination boundary surface of the superposed metal layer components. , Wherein the lamination boundary surface is subjected to friction stir welding. 2. At least two of said metal layer constituting members
The metal laminate joined body according to claim 1, wherein the pieces have different planar shapes. 3. At least two of the metal layer constituent members
The metal laminated joint according to claim 1 or 2, wherein the individual materials are different in material type.