JP3023493B2 - Casting joining method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved casting method.

[0002]

2. Description of the Related Art A conventional casting method is disclosed in
There is a thing as shown in Japanese Patent No. -183771, which is subjected to self-fluxing alloy spraying on a joint surface of a metal to be joined, and after pouring the molten metal into a mold having a predetermined shape, In this method, both metals are joined by melting and diffusing the thermal spray coating using the heat of the molten metal at that time.

[0003]

In the conventional casting method, in the case of a metal member having a gap or a metal member having a complicated shape, a uniform thermal spray coating is formed on a metal bonding surface by applying a self-fluxing alloy spray. This is difficult, and the adhesion of the thermal spray coating to the metal member is also insufficient, so that there is a problem that high joining strength cannot be obtained when joining the metal member and the molten metal. Therefore, the present invention has been made in order to solve such a problem, and it is an object of the present invention to provide a casting method in which high joining strength can be obtained when joining a metal member and a molten metal regardless of the shape of the metal member. .

[0004]

The casting method of the present invention comprises:
A sintered self-fluxing alloy film is formed from the binder applied to the surface of the metal member and the self-fluxing alloy powder attached to the binder, and the metal member and the molten metal are joined via the sintered self-fluxing alloy film. It is characterized by doing.

(1) Binder As the binder, an aqueous solution obtained by mixing water, alcohol and a water-soluble organic compound in an appropriate amount, or an organic solvent solution containing an appropriate amount of an organic compound is used. (2) Self-fluxing alloy powder As the self-fluxing alloy powder, any one of Ni-based powder, Cu-based powder, and Co-based powder is used.
It is 50 mesh, and the desirable component composition is shown below.
Cu-based self-fluxing alloy powder is B: 0.5 to 5% by weight, Si:
0.5 to 10%, Cr: 30% or less, Fe: 0.5 to 5
%, C: 0.1 to 2%, Ni: 5 to 20%, and a particle size of 100 to 3 in which the balance is Cu.
It is a powder of 50 mesh. Ni-based self-fluxing alloy powder is weight%
B: 0.5 to 5%, Si: 0.5 to 10%, Cr: 5
-30%, Fe: 0.5-5%, C: 0.1-2%
Particle size of 10 or more containing Ni and the balance being Ni
It is a grain of 0 to 350 mesh. Co-based self-fluxing alloy powder is B: 0.5-5%, Si: 0.5-10%, C
r: 5 to 30%, Fe: 0.5 to 5%, C: 0.1 to 2
% Or more, and the balance is Co with a particle size of 100 to 350 mesh. (3) Sintered self-fluxing alloy film This is a porous or homogeneous film having a thickness of 50 to 300 μm sintered in a non-oxidizing atmosphere. (4) Sintering atmosphere As the sintering atmosphere, a non-oxidizing atmosphere such as an N ₂ atmosphere or an Ar atmosphere is used.

[0006]

When a metal member having a sintered self-fluxing alloy film formed on its surface is brought into contact with a molten metal, the sintered self-fluxing alloy film is melted, diffusion-bonded to the metal member, and High bonding strength is obtained by melting contact.

[0007]

Embodiments of the present invention will be described below. An S45C steel ring 1 as shown in FIG. 1 is subjected to steel shot to remove stains such as oxides on the surface, and then an organic solvent solution containing an appropriate amount of an organic compound as a binder on the inner peripheral surface 2 of the ring 1. Is applied, a self-fluxing alloy powder as shown in Table 1 below is adhered to the inner peripheral surface 2 to a thickness of 0.1 to 0.2 mm. Next, the self-fluxing alloy powder is sintered at 960 to 1000 ° C. in a heating furnace in an N ₂ atmosphere, and then cooled in the air.
A sintered self-fluxing alloy film of about 0.2 mm is formed. afterwards,
After disposing the ring 1 in a sand mold, molten spheroidal graphite cast iron at about 1380 ° C. was poured to obtain a shaft 3 to which the ring 1 was joined as shown in FIG.

Table 1 also shows the shear load at the joint.

FIG. 3 is a photomicrograph (3% nital corrosion, magnification 50) showing a joint boundary between the ring 1 and the shaft 3.
Times), and were joined under the conditions shown in Table 2 below.

[0010] The joining method of the present invention is suitable for joining iron castings and between iron castings and dissimilar materials, but is also applicable to joining non-ferrous castings and joining nonferrous castings and dissimilar materials.

[0011]

According to the present invention, a good joint can be obtained without much restriction by the metal member and the molten metal, and a high joint strength can be obtained regardless of the shape of the metal member.
In addition, the present casting method has a good yield of the self-fluxing alloy powder, and the self-fluxing alloy powder can be easily adhered by applying a binder. Sintering prevents high temperature oxidation of the metal member.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a metal member.

FIG. 2 is a perspective view showing members joined by casting.

FIG. 3 is a micrograph showing a metal structure of a joint between a steel ring and a cast iron casting.

[Explanation of symbols]

 1 ring 2 inner peripheral surface 3 shaft

[Table 1]

[Table 2]

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B22D 19/04 B22D 19/00

Claims (1)

(57) [Claims] 1. A sintered self-fluxing alloy film is formed from a binder applied to the surface of a metal member and a self-fluxing alloy powder adhered to the binder, and the metal member is formed through the sintered self-fluxing alloy film. A cast joining method characterized by joining a molten metal.