JPH04270078A - Joined structure of aluminum material and copper material and joining method - Google Patents

Abstract

PURPOSE:To obviate the necessity of large equipment at the time of joining an aluminum material and a copper material having large joining areas, respectively. CONSTITUTION:The joined structure is constituted of a copper material 12, whose joining surface is divided by projecting parts 10a, 10b, 10c, and aluminum connecting materials 18a, 18b, 18c, whose ends 16a, 16b, 16c are pressure-welded to the ends 14a, 14b, 14c of the projecting parts 10a, 10b, 10c, and an aluminum material 22 to which the other ends 20a, 20b, 20c of the aluminum connecting materials 18a, 18b, 18c are joined. The aluminum connecting materials 18a, 18b, 18c are successively pressure-welded to the ends 14a, 14b, 14c, respectively. As to the electric current or pressure necessary for a single rolling, one-third of the electric current or pressure required at the time when the whole joining area is pressure-welded at a time suffices.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bonding structure and method suitable for bonding aluminum and copper materials, which have a large bonding area.

0002

[Prior art] A joining member between aluminum and copper materials is
For example, it is used for switching parts between aluminum and copper materials, such as the outlet of a transformer. This type of conventional joining structure is one in which the linear ends of an aluminum material and a copper material are simply joined, and consist of one joining surface. Conventional joining methods of this type include energized heat pressure welding, in which the ends of aluminum and copper materials are brought together and heated by electricity, and pressure is applied to join the aluminum and copper materials, and welding is performed without applying heat. Cold pressure welding involves applying pressure to join aluminum and copper materials. According to these methods, a hard and brittle alloy layer of aluminum and copper is less likely to form, so a joint with excellent strength can be obtained.

0003

However, in such a joining structure and method, it is necessary to increase the current or pressure in proportion to the joining area. Therefore, very large equipment was required to join aluminum and copper materials, which have a large bonding area.

SUMMARY OF THE INVENTION An object of the present invention is to provide a joining structure and a joining method that do not require large equipment even when joining aluminum materials and copper materials, which have a large joining area.

[0005]

[Means for Solving the Problems] The structure and method for joining aluminum and copper materials according to the present invention are as follows, which achieve the above-mentioned objects.

[0006] The joining structure according to the present invention includes a copper material whose joining surface is divided by a plurality of protruding pieces, a plurality of aluminum connecting members each having one end pressure-welded to the end of the said protruding pieces, and these aluminum connecting members. It consists of an aluminum material with the other end joined.

[0007] In the joining method according to the present invention, one end of an aluminum connecting material is sequentially pressure-welded to each end of a plurality of protrusions formed on a copper material, and the other ends of these aluminum connecting materials are joined to the aluminum material. It is something.

[0008] Also, the pressure welding here refers to energized heating pressure welding,
This includes cold pressure welding, etc. Furthermore, joining here includes pressure welding, welding, brazing, and the like.

[0009]

[Operation] In the joining structure and joining method according to the present invention, aluminum connecting material is sequentially pressure-welded to the ends of a plurality of protrusions formed on a copper material. The current or pressure required for one press-welding is determined not by the entire joint area, but by the joint area between the end of the protruding piece and the aluminum connecting material in one press-welding. Therefore, even if the total bonding area is large, since the total bonding area is divided into a plurality of parts, the current or pressure required for one press contact becomes small. Further, the aluminum connecting material and the aluminum material can be easily joined with simple equipment due to conditions such as being of the same type of metal, having a low melting point, and being soft.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a perspective view showing an embodiment of a joining structure according to the present invention, and FIGS. 2 to 4 are perspective views showing an embodiment of a joining method according to the invention.

[0011] The joining structure according to the present invention includes protrusions 10a,
Copper material 12 having 10b and 10c and projecting pieces 10a and 10
One end 16a is attached to the ends 14a, 14b, and 14c of b and 10c.
, 16b, 16c are press-welded to the aluminum connecting material 18.
a, 18b, 18c and aluminum connecting materials 18a, 1
The other ends 20a, 20b, 20c of the aluminum members 8b, 18c are joined to an aluminum material 22.

Furthermore, a notch 24d is provided between the protrusions 10a and 10b, and a notch 24d is provided between the protrusions 10b and 10c.
e are formed respectively. Furthermore, like the copper material 12, the aluminum material 22 has protrusions 26a and 26b.
, 26c and notches 28d and 28e can be formed.

[0013] The structure consisting of the projections 10a, 10b, 10c and the notches 24d, 24e has parts unrelated to pressure welding cut out, so that the current, heat, pressure, etc. during pressure welding can be applied to the aluminum connecting material 18a. , 18b, 18c.

Next, the joining method according to the present invention will be explained.

First, the end 14a of the protruding piece 10a of the copper material 12
One end 16a of the aluminum connecting material 18a is pressed into contact with the aluminum connecting member 18a. As a pressure welding method, for example, cold pressure welding is performed after energizing heat pressure welding. In the energization heat pressure welding, the end 14a of the protruding piece 10a and the one end 16a of the aluminum connecting material 18a are bonded at 1.0 kg/
They are brought together under a pressure of mm2 and heated with a current of 50 A/mm2. Then, when the end portion 14a of the copper material 12 and the one end 16a of the aluminum connecting material 18a begin to melt, they are further pressurized at a pressure of 30 kg/mm2 and the process is completed. In cold welding, copper materials 12 are welded together by energizing heat welding.
and one end 16a of the aluminum connecting material 18a.
and further pressurized at a pressure of 230 kg/mm2. At this time, the copper-aluminum alloy layer remaining on the joint surface 30a is completely pushed out (FIGS. 2 and 3). In addition,
The above pressure and current values are all examples.

Similarly, the protrusions 10b, 10 of the copper material 12
Aluminum connecting material 18b at the ends 14b and 14c of c,
One end 16b and 16c of 18c are successively pressed together (FIG. 4).

[0017] The current or pressure during pressure welding is proportional to the joint area. However, in this embodiment, the entire bonding area is divided into three parts, so the current or pressure required for one pressure welding is three times smaller than that of the conventional method in which the entire bonding area is pressure welded at one time. One of these is fine.

Finally, aluminum connecting materials 18a, 18
The other ends 20a, 20b, 20c of b, 18c are joined to the aluminum material 22, and a joining structure as shown in FIG. 1 is completed. In this case, bonding can be easily achieved with simple equipment due to the use of similar metals, low melting point, softness, and other conditions. Preferred examples of the joining method include electrically heated pressure welding, cold pressure welding, and brazing with an aluminum alloy.

[0019]

According to the bonding structure and bonding method of the present invention, by dividing the bonding area between the aluminum material and the copper material into a plurality of parts, the current or pressure required for one pressure welding can be reduced. Therefore, it is possible to join the aluminum material and the copper material, which have a large joint area, even with small-scale equipment.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of a joining structure according to the present invention.

FIG. 2 is a perspective view showing an embodiment of the joining method according to the present invention.

FIG. 3 is a perspective view showing an embodiment of the joining method according to the present invention.

FIG. 4 is a perspective view showing an embodiment of the joining method according to the present invention.

[Explanation of symbols]

10a, 10b, 10c...copper material protrusion 12...copper material 14a, 14b, 14c...copper material protrusion 16a, 1
6b, 16c... One end of aluminum connecting material 18a, 18
b, 18c...Aluminum connecting material 20a, 20b, 20
c...Other end of aluminum connecting material 22...Aluminum material

Claims (2)

[Claims] Claim 1: A copper material whose joining surface is divided by a plurality of protruding pieces, a plurality of aluminum connecting members whose one ends are pressure-welded to the ends of the protruding pieces, and the other ends of these aluminum connecting members are joined. A joint structure of aluminum and copper materials. [Claim 2] One end of an aluminum connecting material is sequentially pressure-welded to each end of a plurality of protrusions formed on a copper material, and the other ends of these aluminum connecting materials are joined to the aluminum material. joining method.