JPH10193135A - Joining method for metallic member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase joining strength between each joining metallic member and a brazing filler metal layer by inserting between the joining metallic members the brazing filler metal layer made of an alloy metal that causes no Kirkendall effect at the time of diffusion welding with the joining metallic member and also applying a diffusion processing. SOLUTION: A brazing filler metal layer 2 with a prescribed thickness is arranged between at least two or more joining metallic members 1, 1; after that, a space is eliminated between each joining metallic member 1, 1 and the brazing filler metal layer 2, by means of a calking jig or a holding jig; and then, with a heating diffusion treatment applied, mutual diffusion is effected between each joining metallic member 1, 1 and the brazing filler metal layer 2, which are thereby joined mutually.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for joining metal members, and more particularly to a method for joining metal members by diffusion joining.

[0002]

2. Description of the Related Art Generally, a flow path (hereinafter, referred to as a piping circuit) is formed internally for cooling a power supply, cooling a printed circuit board, and radiating heat from an air conditioner (air conditioner).
A cooling member and a heat exchanger piping member made of copper or a copper alloy are used.

In recent years, as a method of manufacturing these cooling members and heat exchanger piping members, two copper and / or copper alloy plates have been subjected to press working or the like in advance to form channels (circuits). 2. Description of the Related Art A method has been developed for forming a plate piping circuit by superimposing two copper and / or copper alloy plates with their circuit forming surfaces facing each other and joining them together.

Here, for joining copper and / or copper alloy,
Welding, brazing, soldering, and the like are used, and among them, brazing is widely used particularly for electric equipment parts, piping, heat exchangers, and the like.

[0005]

However, in the brazing of copper and / or copper alloy plates, when a high-pressure coolant or cooling gas is supplied into the plate piping circuit, the joining strength is not so high. However, there is a problem that there is a risk of peeling.

Accordingly, an object of the present invention is to solve the above problems and to provide a method for joining metal members having high joining strength.

[0007]

According to a first aspect of the present invention, a brazing material layer having a predetermined thickness is arranged between at least two or more joining metal members. Alternatively, by using a holding jig, a gap between each of the joining metal members and the brazing material layer is eliminated, and thereafter, a heat diffusion process is performed to cause the respective joining metal members and the brazing material layer to interdiffuse, thereby forming the respective joining members. The joining between the metal member and the brazing material layer is performed.

The invention according to claim 2 is the method for joining metal members according to claim 1, wherein the brazing material layer is a clad layer of a metal and a brazing material.

According to a third aspect of the present invention, an alloy layer composed of at least two or more elements is formed on the surface of at least two or more metal members to form a joint metal member. Place a thick brazing material layer, then
With a caulking jig or a holding jig, eliminate the gap between each of the joining metal members and the brazing material layer, and then perform a heat diffusion process to cause interdiffusion between the alloy layer and the brazing material layer. The joining metal member and the brazing material layer are joined.

According to a fourth aspect of the present invention, there is provided the method for joining metal members according to the first and third aspects, wherein the brazing material layer is made of a brazing material foil.

The invention according to claim 5 is the method for joining metal members according to claim 1 and claim 3, wherein the brazing material layer is formed by plating a brazing material on one surface of the joining metal member.

According to the above arrangement, a brazing material layer having a predetermined thickness is arranged between at least two or more joining metal members.
Then, with a caulking jig or a holding jig, eliminate the gap between each of the joining metal members and the brazing material layer, and then perform a heat diffusion process to cause mutual diffusion between the joining metal members and the brazing material layer. Therefore, since the joining metal members are joined to the brazing material layer, a joining method of the metal members having high joining strength is provided.

[0013]

Embodiments of the present invention will be described below.

FIG. 1 is a schematic view of a method for joining metal members according to the present invention. FIG. 1A is an external perspective view of a joining metal member, and FIG. 1B is an external perspective view of a brazing material foil.
(C) shows a schematic diagram of the lamination of the joining metal member and the brazing material foil,
FIG. 1D shows a lamination cross-sectional view of the joining metal member and the brazing material foil after the crimping process, and FIG. 1E shows a lamination cross-sectional view of the joining metal member and the brazing material foil after the pressing process. I have.

As shown in FIGS. 1 (a), 1 (b) and 1 (c), a brazing material foil having a predetermined thickness is provided between at least two or more (two in the figure) joining metal members 1 and 1. (Brazing material layer) 2.

Thereafter, as shown in FIGS. 1 (d) and 1 (e), a caulking process 6 or a pressing process from the direction of arrow Y is performed to provide a space between each of the joining metal members 1, 1 and the brazing material foil 2. In addition to eliminating the gap, the laminated joining metal members 1 and 1 and the brazing material foil 2 are caulked to form a joining unit (not shown). In this joining unit, the joining surfaces of the joining metal members 1 and 1 and the surface of the brazing foil 2 are always in contact.

After that, a diffusion treatment is performed by heating and holding at a predetermined atmosphere, temperature, and time, and the metal foils 2 are mutually diffused between the joining metal members 1, 1 and the brazing material foil 2, so that the joining metal members 1, 1 Bonding between brazing material foils 2 is performed.

The material of the joining metal member 1 is not particularly limited, but copper or a copper alloy is particularly desirable.

The material of the brazing material foil 2 is Kirkendall in the case of diffusion bonding with the bonding metal member 1.
The alloy is not particularly limited as long as it does not produce an effect.

The atmosphere in the diffusion treatment is not particularly limited, and may be any atmosphere in which the brazing material component is not oxidized, and examples thereof include a vacuum, an inert gas atmosphere, and a reducing gas atmosphere.

The temperature and time in the diffusion treatment are not particularly limited, and are appropriately selected according to the materials of the joining metal member 1 and the brazing material foil 2.

That is, according to the method for joining metal members of the present invention, a brazing material foil made of an alloy that does not cause the Kirkendall effect at the time of diffusion joining with the joining metal member is used as the brazing material layer. Since it is sandwiched between the joining metal members and subjected to the diffusion treatment, the joining strength between each joining metal member and the brazing material foil is increased.

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

FIG. 2 is a schematic view of a method of joining metal members according to the first embodiment. FIG. 2A is an external perspective view of the joining metal member, FIG. 2B is an external perspective view of the brazing material foil, and FIG. 2C is a schematic diagram of the lamination of the joining metal member and the brazing material foil. 2 (d) shows a lamination cross-sectional view of the joining metal member and the brazing material foil after the crimping process, and FIG. 2 (e) shows a lamination cross-sectional view of the joining metal member and the brazing material foil after the pressing process. Is shown. The same members as those in FIG. 1 are denoted by the same reference numerals.

As shown in FIGS. 2 (a) to 2 (c), the method of joining metal members according to the present embodiment is such that the joining metal members 1 and 1 are subjected to rolling or press working in advance so as to form a circuit. 3 and 3 are formed, and the circuit forming surfaces face each other so as to overlap each other. The brazing material foil 2 is formed by punching or punching according to the shape of the circuit 3 of the joining metal members 1 and 1. The punching circuit 4 is formed.

Thereafter, as shown in FIGS. 2 (d) and 2 (e), a crimping process 6 or a pressing process from a direction indicated by an arrow Y in the drawing is performed to join each of the joined metal members 1, 1. The gap between the material foils 2 is eliminated, and the laminated joining metal members 1 and 1 and the brazing material foil 2 are caulked to form a joining unit (not shown).

Thereafter, a diffusion treatment is carried out by heating and holding at a predetermined atmosphere, temperature, and time, so that the respective bonding metal members 1, 1 and the brazing material foil 2 are mutually diffused, and the respective bonding metal members 1, 1 Bonding between brazing material foils 2 is performed.

It goes without saying that the metal member joining method of the present embodiment exhibits the same operation and effect as the present invention.

FIG. 3 is a schematic view of a method for joining metal members according to the second embodiment. FIG. 3A shows an external perspective view of a joining metal member, FIG. 3B shows an external perspective view of a brazing filler metal foil, and FIG. 3C shows an external perspective view of a brazing filler metal foil. 3 (d) shows a schematic lamination diagram of the joining metal member and the clad brazing material foil, and FIG. 3 (e) shows a lamination cross-sectional view of the joining metal member and the cladding brazing material foil after crimping.
(F) shows the lamination cross-sectional view of the joining metal member and the brazing filler metal foil after the pressing process. The same members as those in FIG. 1 are denoted by the same reference numerals.

In the method for joining metal members of the present invention,
As shown in FIG. 1, the brazing material foil 2 sandwiched between the joining metal members 1 and 1 was a single layer.

As shown in FIGS. 3 (a) to 3 (d), the joining method of the metal member according to the present embodiment is such that the brazing material layers 14, 14 having a predetermined thickness are electroplated or melted on both surfaces of the metal foil 13. The clad brazing foil 12 formed by plating is sandwiched between the joining metal members 11 and 11. Joined metal member 1
Circuits 3 and 3 are formed by applying rolling or press working in advance to 1, 1 and 11 so that the circuit forming surfaces face each other so as to be overlapped. The punching circuit 4 is formed by punching or punching according to the shape of the circuit 3 of the members 11 and 11.

Thereafter, as shown in FIGS. 3 (e) and 3 (f), a crimping process 6 or a pressing process from a direction indicated by an arrow Y in the drawing is performed, so that each of the joining metal members 11, 11 The gap between the brazing material foils 12 is eliminated, and the laminated joining metal members 11 and 11 are stacked.
And the clad brazing foil 12 are caulked to form a joining unit (not shown).

After that, a diffusion treatment is performed by heating and holding at a predetermined atmosphere, temperature, and time, so that each bonded metal member 1
1,11 and the clad brazing foil 12
The joining between the joining metal members 11 and the clad brazing material foil 12 is performed.

Material and thickness of metal foil 13, brazing material layer 1
The material and thickness of 4 are not particularly limited, and are appropriately selected according to the required bonding strength and the material of the bonding metal member 11.

It is needless to say that the metal member joining method according to the present embodiment exhibits the same operation and effect as the present invention, and that the brazing material foil sandwiched between the joined metal members has a clad structure. As a result, the bonding strength is further improved.

FIG. 4 is a schematic view showing a method of joining metal members according to the third embodiment. FIG. 4A is an external perspective view of the joining metal member, FIG. 4B is a schematic diagram of the joining metal member, and FIG. 4C is a cross-sectional view of the joining metal member after caulking. FIG. 4D is a cross-sectional view of a laminated metal member after pressing. The same members as those in FIG. 1 are denoted by the same reference numerals.

In the method for joining metal members of the present invention,
As shown in FIG. 1, a brazing filler metal foil 2 was sandwiched between the joined metal members 1 and 1.

As shown in FIGS. 4A and 4B, at least one joining metal member 21a, 21b (joining metal member 21 in FIG.
b) forming a brazing material layer 22 having a predetermined thickness on one surface by electroplating or hot-dip plating;
The brazing material layer forming surfaces a and 21b face each other and are superposed. Either one of the joining metal members 21a,
The circuit 3 is formed on the metal member 21b (joining metal member 21a in the figure) by rolling or press working in advance, and the circuit forming surfaces are faced and overlapped.

Thereafter, as shown in FIGS. 4 (c) and 4 (d), a crimping process 6 or a pressing process from a direction indicated by an arrow Y in the drawing is carried out, so that the joining metal member 2 is formed.
The gap between the brazing filler metal layers 21a, 21b and the brazing filler metal layer 22 is eliminated, and the laminated joining metal members 21a, 21b and the brazing filler metal layer 22 are caulked to form a bonding unit (not shown).
And

After that, a diffusion process is performed by heating and holding at a predetermined atmosphere, temperature, and time, so that
The metal members 21a and 21b and the brazing material layer 22 are joined by mutually diffusing between the a and 21b and the brazing material layer 22.

The material and thickness of the brazing material layer 22 are not particularly limited, and are appropriately selected according to the required bonding strength and the material of the bonding metal member 21.

It goes without saying that the method of joining metal members according to the present embodiment also exerts the same functions and effects as the present invention, and since the brazing material layer is integrally formed on the surface of the joined metal members, It is not necessary to form a punched circuit by punching or punching in accordance with the shape of the circuit of the joining metal member as in the case of brazing material foil, so that manufacturing costs can be reduced.

FIG. 5 is a schematic view of a method for joining metal members according to the fourth embodiment. 5A shows an external perspective view of the metal member, FIG. 5B shows an external perspective view of the joined metal member, and FIG. 5C shows a brazing material layer on one surface of one of the joined metal members. FIG. 5D shows a laminated cross-sectional view of the bonded metal member after caulking, and FIG.
(E) shows the lamination cross-sectional view of the joining metal member after the pressing process. The same members as those in FIG. 1 are denoted by the same reference numerals.

When diffusion bonding is performed by disposing a brazing material layer between joining metal members that have not been subjected to surface treatment, voids are generated on the joining surface due to the Kirkendall effect, and a combination of elements that causes a reduction in the strength of the joining portion may occur. is there.

For example, as a combination of face-centered cubic metals, Cu-Ni, Cu-Au, Ag-Au, Ag-P
d, Ni-Co, Ni-Au, Fe (γ) -Ni, Cu
-CuAl (Al <7 wt%), Cu-CuSn (Sn
<10 wt%), which limits the combination of materials of the joining metal member and the brazing material layer.

Therefore, the joining method of the metal member according to the present embodiment is, as shown in FIGS.
a, an alloy layer 31b of at least two or more elements having a predetermined thickness is formed by electroplating or hot-dip plating, and the brazing material layer 32 and the joining metal member 31 are formed.
The diffusion bonding is performed by using the joining metal member 31 in which the surface of the metal member 31a is covered with the alloy layer 31b so that the Kirkendall effect does not occur between the metal members 31a and 31b.

Thereafter, as shown in FIGS. 5 (d) and 5 (e), each of the joining metal members 31, 31 and the brazing material layer 3 are subjected to crimping 6 or pressing from the direction of arrow Y.
The gap between the two is eliminated, and the laminated joining metal members 31, 31 and the brazing material layer 32 are caulked to form a joining unit (not shown).

After that, a diffusion treatment is performed by heating and holding at a predetermined atmosphere, temperature, and time, so that each bonding metal member 3
The metal members 31 and 31 and the brazing material layer 32 are bonded by mutually diffusing between the metal members 31 and the brazing material layer 32.

The chemical composition of the alloy layer 31b is not particularly limited as long as it is made of a material other than the brazing material layer 32 and an element which causes the Kirkendall effect, and is appropriately selected according to the materials of the metal member 31a and the brazing material layer 32. And
Further, the thickness of the alloy layer 31b is not particularly limited.

In the method of joining metal members according to the present embodiment, it is needless to say that the same operation and effect as those of the present invention can be obtained. Further, an alloy layer composed of at least two or more elements is formed on the surface of the metal member. Since they are integrally formed, there is no restriction on the combination of the materials of the metal member and the brazing material layer, and there is no possibility that a void is generated in the bonding surface and the strength of the bonding portion is reduced, and it is possible to obtain the necessary bonding strength. it can.

In this embodiment, the brazing material layer 32 is used.
Is formed by plating one surface of the joining metal member 31, but it goes without saying that a brazing material foil as shown in FIG. 1 may be used.

FIG. 6 is a schematic view showing a method of joining metal members according to the fifth embodiment. 6A shows an external perspective view of the metal member, FIG. 6B shows an external perspective view of the joined metal member, and FIG. 6C shows a brazing material on one surface of one of the joined metal members. FIG. 6D is a schematic view showing a laminated structure of the bonded metal member, FIG. 6E is a cross-sectional view of the laminated metal member after crimping, and FIG.
(F) shows the lamination cross-sectional view of the joining metal member after the pressing process. The same members as those in FIG. 1 are denoted by the same reference numerals.

As shown in FIGS. 6A to 6D, the joining method of the metal member according to the present embodiment employs an alloy layer 31b having a predetermined thickness made of at least two or more elements on the surface of the metal member 31a. Are formed by electroplating or hot-dip plating on the joining metal members 31 and 31 so that the circuits 3 and 3 are formed in advance by rolling or pressing, and the circuit forming surfaces are faced and overlapped. To

Thereafter, as shown in FIGS. 6 (e) and 6 (f), each of the joining metal members 31 is welded by performing a crimping process 6 or a pressing process from a direction indicated by an arrow Y in the drawing. The gap between the material layers 32 is eliminated, and the laminated joining metal members 31, 31 and the brazing material layer 32 are caulked to form a joining unit (not shown).

After that, a diffusion treatment is performed by heating and holding at a predetermined atmosphere, temperature, and time, so that each bonding metal member 3
The metal members 31 and 31 and the brazing material layer 32 are bonded by mutually diffusing between the metal members 31 and the brazing material layer 32.

Needless to say, the method of joining metal members according to the present embodiment exhibits the same functions and effects as the method of joining metal members according to the fourth embodiment.

By using the method for joining metal members of the present invention, it is possible to join metal members having complicated shapes, which were conventionally difficult to join, at low cost. It is possible to reduce the size and weight of the cooling member and the heat exchanger piping member using the member.

[0058]

In summary, according to the present invention, the following excellent effects are exhibited.

(1) Since a brazing material layer made of an alloy that does not cause the Kirkendall effect at the time of diffusion bonding with a joining metal member is sandwiched between the joining metal members and diffusion treatment is performed, each joining metal is The joining strength between the member and the brazing material layer is high.

(2) Since the brazing material layer is integrally formed on the surface of the joining metal member, a punched circuit is formed by punching or punching according to the circuit shape of the joining metal member like a brazing material foil. The manufacturing cost can be reduced.

(3) At least 2
Since the alloy layer composed of more than two kinds of elements is integrally formed, there is no restriction on the combination of the materials of the metal member and the brazing material layer, and there is no possibility that a void is generated on the joint surface and the strength of the joint part is reduced, which is necessary. Can be obtained according to the bonding strength.

(4) It is possible to join metal members having complicated shapes at low cost.

(5) According to the present invention, it is possible to reduce the size and weight of cooling members and heat exchanger piping members using diffusion bonded metal members.

[Brief description of the drawings]

FIG. 1 is a schematic view of a method for joining metal members of the present invention.

FIG. 2 is a schematic view of a method for joining metal members according to the first embodiment.

FIG. 3 is a schematic view of a method for joining metal members according to a second embodiment.

FIG. 4 is a schematic view of a method of joining metal members according to a third embodiment.

FIG. 5 is a schematic diagram of a method for joining metal members according to a fourth embodiment.

FIG. 6 is a schematic view of a method of joining metal members according to a fifth embodiment.

[Explanation of symbols]

 1, 11, 21, 31 Joined metal member 2 Brazing filler metal foil (brazing filler metal layer) 12 Clad brazing filler metal foil (brazing filler metal layer) 13 Metal foil 14, 22, 32 Brazing filler metal layer 31a Metal member 31b Alloy layer

Claims (5)

[Claims] 1. A brazing material layer having a predetermined thickness is disposed between at least two or more joining metal members, and thereafter, between each of the joining metal members and the brazing material layer by a caulking jig or a holding jig. A metal member, which is subjected to a heat diffusion process to cause mutual diffusion between the joining metal members and the brazing material layer, thereby joining the joining metal members and the brazing material layer. Joining method. 2. The method according to claim 1, wherein the brazing material layer is a clad layer of a metal and a brazing material. 3. An alloy layer comprising at least two kinds of elements formed on at least two or more metal members to form a joint metal member, and a brazing material layer having a predetermined thickness between the joint metal members. After that, the gap between each of the joining metal members and the brazing material layer is eliminated by a caulking jig or a holding jig, and thereafter, a heat diffusion process is performed to allow mutual exchange between the alloy layer and the brazing material layer. A method of joining metal members, wherein the metal members are diffused and joined between the joining metal members and the brazing material layer. 4. The method according to claim 1, wherein the brazing material layer is made of brazing material foil. 5. The brazing material layer according to claim 1, wherein the brazing material layer is formed by plating a brazing material on one surface of the joining metal member.
The joining method of the metal member as described in the above.