JPH1110327A - Brazing and joining method of metal member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a metal member into a thin wall as much as possible and to improve the quality of brazing. SOLUTION: In the brazing method of the metal member, plural metal members 12, 14 having the wall thickness are brazed by mutually bringing the joining surfaces 12m, 14m formed with the wall thickness into contact. In this case, the brazing filler metal placing part 14 capable of placing the brazing filler metal 15 in a wall shape along the joining surface 14m is provided in the vicinity of the joining surface 14m of one metal member 14, after the brazing filler metal 15 is placed in the brazing filler metal placing part 14d of the metal member 14, another metal member 12 is positioned while guiding with the brazing filler metal 15. And the joining surface 12m of another metal member 12 is combined so as to come into face contact with the joining surface 14m of one metal member 14, and the whole of combined metal members 12, 14 and the brazing filler metal 15 is put under the atmosphere of the melting temperature or above of the brazing filler metal 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brazing method in which a plurality of metal members having a large thickness are brought into contact with each other at a joining surface formed by the thickness of the metal members.

[0002]

2. Description of the Related Art A conventional brazing method related thereto is described in Japanese Patent Publication No. 57-44433, and a longitudinal sectional view showing the method is shown in FIG. The brazing method is a technique in which, when a pair of green compacts 2 and 4 obtained by press-molding a metal powder are sintered, the two are simultaneously bonded by brazing. One compact 2 has a positioning recess 2h at a predetermined position on its joint surface 2m.
Are formed, and a space 2k for accommodating the brazing material 5x is formed at the center position. The other compact 4 has a positioning projection 4t formed at a predetermined position on the joint surface 4m, and a brazing material 5 at the center.
A space 4k for accommodating y is formed.

[0003] In order to join the two compacts 2, 4 by brazing,
The brazing materials 5x, 5y are stored in the spaces 2k, 4k, and as shown in FIG. 3, the joining surfaces 2m, 4m are fitted together with the concave portions 2h and the convex portions 4t fitted to each other. Next, in this state, the green compacts 2 and 4 are set in a sintering furnace and heated at a predetermined temperature in a reducing atmosphere. Thereby, the green compacts 2, 4
Is sintered, and the brazing materials 5x and 5y melt and flow out of the spaces 2k and 4k, and penetrate between the joining surfaces 2m and 4m to perform brazing.

[0004]

However, according to the above-mentioned brazing method, the spaces 2k and 4k for accommodating the brazing materials 5x and 5y are formed in the walls of the compacts 2 and 4, respectively. It is difficult to form a compact into a thin wall. The melted brazing material permeates well in the vicinity of the spaces 2k and 4k, but does not sufficiently permeate the separated portions. In particular, the brazing material is less likely to penetrate into the fitting portion between the positioning recess 2h and the projection 4t. For this reason, the permeation amount of the brazing material becomes uneven, and the bonding strength of the green compacts 2 and 4 also decreases. Furthermore, since the spaces 2k and 4k after the melted brazing material has flown out remain, the strength of the sintered bodies 2 and 4 is also reduced.

[0005] Therefore, the invention of claim 1 of the present invention is:
The object of the present invention is to make it possible to form a thin metal member without the need for a brazing material storage space, and to further improve the joining quality by allowing the brazing material to penetrate the joining surface almost uniformly. is there. The invention of claim 2 is
In addition to the object of the first aspect of the present invention, an object of the present invention is to improve the efficiency of the brazing operation by enabling brazing at the same time as sintering. A third object of the present invention is to provide a brazing material that can be easily positioned and supported, in addition to the object of the first embodiment.

[0006]

The above object is achieved by a method for brazing and joining metal members having the following features. That is, the invention according to claim 1 is a method of brazing by bringing a plurality of metal members having a thickness into contact with each other at a joining surface formed by the thicknesses, wherein the joining is performed in the vicinity of the joining surface of one metal member. Providing a brazing material placing portion on which a brazing material can be placed in a wall shape along the joint surface, placing the brazing material on the brazing material placing portion of the metal member, and then attaching another brazing material to the brazing material. And position the other metal member so that the joining surface of the other metal member comes into surface contact with the joining surface of the one metal member. It is characterized by being placed below.

According to the present invention, since the brazing material is positioned in a fence along the joining surface, it is not necessary to provide a space for the brazing material in the wall of the metal member, and the metal member can be formed to be thin. Further, since the brazing material is positioned in a fence along the joining surface of the metal member, the melted brazing material uniformly penetrates between the joining surfaces. Further, since another metal member can be positioned by the brazing material, it is not necessary to form unevenness for positioning on the joint surface as in the related art, and there is no unevenness in the permeation amount of the brazing material.

[0008] The invention described in claim 2 is the first invention.
In the brazing method of the metal member described in the above, the metal member is a green compact obtained by pressing metal powder, and when the green compact is sintered, the brazing material is melted. It is characterized by. According to the present invention, since the brazing material is melted when the green compact is sintered, the efficiency of the brazing operation can be improved and energy can be saved.

[0009] The invention described in claim 3 is the first invention.
In the brazing method of the metal member described in the above, the brazing material mounting portion is formed in a step shape so that the band-shaped brazing material can be arranged in a fence along the joining surface of the metal member. And According to the present invention, by setting the brazing material on the brazing material placing portion, the brazing material can be easily positioned along the joining surface.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION

[First Embodiment] A method for brazing and joining metal members according to a first embodiment of the present invention will be described below with reference to FIG. The brazing method of metal members according to the present embodiment is a technique of simultaneously bonding a pair of bowl-shaped thin green compacts 12 and 14 at the time of sintering, and FIG. FIG. 3 is a longitudinal sectional view showing a state in which the thin green compacts 12 and 14 are set and combined. In the drawings, the thicknesses of the thin green compacts 12 and 14 are shown in an enlarged manner in order to show the joining portions in detail.

The thin green compacts 12 and 14 are formed with narrow ring-shaped joining surfaces 12m and 14m at the opening edges, and a step 12 is formed inside the joining surfaces 12m and 14m.
d and 14d are formed parallel to the joining surfaces 12m and 14m. Therefore, when the two thin green compacts 12 and 14 are aligned at the positions of the joining surfaces 12m and 14m, a ring-shaped groove is formed along the joining surfaces 12m and 14m by the steps 12d and 14d. Then, a band-shaped brazing material 15 formed in the groove portion according to the shape of the ring groove.
Is inserted.

Next, a description will be given of a process from the production of the metal member according to the present embodiment to the completion of the brazing. First, a metal powder (not shown) of a press is filled with a metal powder as a sintering material. Here, iron-based metal powder
The composition of Fe-2% Cu-0.8% Gr-0.8% ZnSt is used. When the metal powder is filled in the mold, the press is driven to press-mold the metal powder, and the green compacts 12 and 14 having a density of 7.0 g / cm ³ and a thickness of 2 mm are formed.

When the thin green compacts 12 and 14 are formed, the ring-shaped brazing material 1
5 is set. Thus, the brazing material 15 is positioned in a wall shape along the joining surface 14m. When the brazing material 15 is set on one thin green compact 14 in this way, the other thin green compact 12 is guided by the brazing material 15 and covered on one thin green compact 14. As a result, both the thin green compacts 12 and 14 are
m, and the brazing material 15 is
d and 14d are fitted into the grooves in a ring shape (see FIG. 1). Here, the brazing material 15 is Cu
A material having a composition of -40Ni-15Mn-2Si-1.5B is used.

Next, the thin green compacts 12, 14 and the brazing material 15 assembled in the state shown in FIG. 1 are set in a sintering furnace (not shown) and heated at about 1150 ° C. in a reducing atmosphere. You. As a result, the thin green compacts 12, 14 are sintered, and the brazing material melted between the joining surfaces 12m, 14m penetrates, and the thin green compacts 12, 14 (thin sintered compact 1) are melted.
2, 14) are joined by brazing.

As described above, according to the present embodiment, it is not necessary to provide a space for accommodating the brazing material 15 in the walls of the thin green compacts 12 and 14, so that the thin green compacts 12 and 14 are not required.
Can be formed as thin as possible. Further, the brazing material 15 is formed in a belt shape, and the joining surfaces 12m, 14 of the thin green compacts 12, 14 are formed.
Since it is positioned in a fence along m, the melted brazing material permeates evenly between the joining surfaces. Further, since the thin green compacts 12 and 14 can be positioned by the brazing material 15, unevenness for positioning is formed in the joining surface 12 m,
There is no need to form the brazing material at 14 m, and there is no unevenness in the permeation amount of the brazing material. Therefore, the thin green compacts 12, 14
The quality of the brazing of the (thin sintered bodies 12, 14) is improved. Further, since no space or the like exists in the walls of the thin sintered bodies 12 and 14, the strength does not decrease.

Further, since the brazing material 15 is melted when the thin green compacts 12 and 14 are sintered, it is not necessary to heat the brazing material 15 or the like only for brazing, thereby improving work efficiency and saving energy. Can be achieved. Further, the brazing material 15 is joined to the joining surface 1 by the steps 12d and 14d.
Since it can be positioned along 2m and 14m, the brazing material 15
Positioning is easily maintained. The thin green compact 12,
After the sintering of the thin-walled sinters 14 and 14, the thin-walled sinters 12 and 14 and the brazing material 15 are combined and heated to join the thin-walled sinters 12 and 14, as shown in FIG. No.

In the present embodiment, an iron-based material having a composition of Fe-2% Cu-0.8% Gr-0.8% ZnSt is used as the metal powder, and Cu-40Ni-15Mn-2Si-1.5 is used as the brazing material. Although an example is shown in which the thin green compacts 12 and 14 are sintered at about 1150 ° C. and brazing is performed using the composition B, the present invention is not limited to this. For example, a metal powder having a composition of Ti-6Al-4V is used, a brazing material of Ti-5-50% wt% Fe is used, and thin green compacts 12 and 14 are sintered at a temperature of about 1300 ° C. Even in this case, brazing can be performed well.

[Second Embodiment] FIG. 2 is a longitudinal sectional view showing a method of brazing a metal member according to a second embodiment of the present invention. The method of brazing and joining metal members according to the present embodiment is a modification of the method of positioning and supporting the brazing material. Other methods are substantially the same as those of the method of brazing and joining metal members according to the first embodiment. The same is true.

On one thin green compact 24 used in the present embodiment, a shelf 24t for positioning and supporting the brazing material 25 is formed to protrude in a ring shape inside the joint surface 24m. . Therefore, as described above, the thickness of the thin green compacts 22 and 24 can be reduced as compared with the case where the brazing material 15 is supported by the step 14d. The thickness of the thin green compact 24 in this embodiment is 1 mm,
The thickness of the thin green compact 24 at the portion of 4t is 2 mm.

Next, from the structure of the metal member according to the present embodiment to the end of the brazing connection will be described. First, a metal powder as a sintering material is filled in a mold (not shown) composed of a mold and a rubber mold, and is subjected to hydrostatic molding at a pressure of about 400 MPa. Here, Ti-6 is used as the metal powder.
An Al-4V composition is used. In this manner, the metal powder is subjected to hydrostatic pressing, whereby thin green compacts 22 and 24 having a thickness of about 1 mm are formed.

Next, a ring-shaped brazing material 25 is set on a shelf 24t of one thin green compact 24. by this,
The brazing material 25 is positioned like a wall along the joining surface 24m. Further, in this state, the other thin green compact 22 is guided by the brazing material 25 and covered on one thin green compact 24. Here, as the brazing material 25, Ti-5 to 50
% Wt% Fe is used.

Next, the thin green compacts 22, 24 and the brazing material 25 assembled in the state shown in FIG. 2 are set in a sintering furnace (not shown), and are heated under a reduced pressure atmosphere (10 ^-5 Torr). 13
Heat at 00 ° C. Thereby, the thin green compacts 22 and 2
4 is sintered, the brazing material melted between the joining surfaces 22m and 24m penetrates, and the thin compacts 22 and 24 (the thin sintered bodies 22 and 24) are joined by brazing.

As described above, according to the brazing method according to the present embodiment, similarly to the brazing method according to the first embodiment, the thin-walled sintered bodies 22 and 24 can be satisfactorily joined. Also, one thin green compact 24 has a brazing material 2
Since the shelf 24t for positioning and supporting the metal 5 is formed to protrude in a ring shape, as shown in the first embodiment, the case where the brazing material 15 is supported by the step 14d is smaller than the case where the brazing material 15 is supported by the step 14d.
The thickness of the thin green compacts 22 and 24 can be reduced.
In the first and second embodiments, the example in which the brazing material is positioned inside the thin green compact has been described. However, when the appearance of the product does not matter, the brazing material is positioned outside the thin green compact. Positioning is also possible.

The embodiments of the present invention have been described above. However, it should be noted that the embodiments of the present invention have the following technical matters in addition to the technical matters described in the claims. Please note. (1) The method for brazing a metal member according to claim 1, wherein the metal member is obtained by sintering a green compact obtained by pressing a metal powder. A method for brazing metal members.

[0025]

According to the present invention, it is not necessary to provide a space for accommodating the brazing material in the wall of the metal member, so that the metal member can be formed thin. Further, since the melted brazing material uniformly penetrates between the joining surfaces, the quality of the brazing joint is improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view illustrating a method of brazing and joining metal members according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view illustrating a brazing method of a metal member according to a second embodiment of the present invention.

FIG. 3 is a longitudinal sectional view illustrating a conventional brazing method.

[Explanation of symbols]

 12 Thin green compact (metal member) 12m joining surface 12d step 14 Thin green compact (metal member) 14m joining surface 14d step 15 brazing material 24t shelf (step)

Claims (3)

[Claims] 1. A method of brazing by bringing a plurality of metal members having a large thickness into contact with each other at a joining surface formed by the thicknesses of the metal members. After the brazing material is placed on the brazing material placing part of the metal member, the brazing material is placed on the brazing material placing portion of the metal member, and another metal member is positioned while being guided by the brazing material. And combining the other metal member so that the joint surface of the other metal member is in surface contact with the joint surface of the one metal member, and placing the combined metal member and the entire brazing material in an atmosphere at or above the melting temperature of the brazing material. Brazing method for joining metal members. 2. The method for brazing a metal member according to claim 1, wherein the metal member is a green compact obtained by pressing a metal powder, and the green compact is sintered. A brazing material is melted at the time. 3. The method for brazing and joining metal members according to claim 1, wherein the brazing material mounting portion has a step so that the band-shaped brazing material can be arranged in a wall shape along the joining surface of the metal members. A brazing method of a metal member, characterized in that it is formed in a shape.