JP3161857B2 - Joining method of casting and dissimilar alloy - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for joining a casting to a dissimilar alloy in a casting step, not a so-called cast glue, and a method for joining a casting and a dissimilar alloy.

[0002]

2. Description of the Related Art When a dissimilar alloy to be joined is thin, good joining is achieved. However, when the thickness of the dissimilar alloy is 10 mm or more, for example, when the thickness of the casting is equal to the dissimilar alloy, the dissimilar alloy is simply used. Even if the alloy is put into a mold and the molten metal of the casting is poured into the injection portion above the joining surface, the joining is not performed.

[0003] Conventionally, for example, when a casting (FC) having substantially the same thickness is joined to steel (S50C) as a dissimilar alloy, first, as shown in FIG. The molten metal is poured out of the mold 3 one after another, and the joining surface 2 of the dissimilar alloy 1 is heated by washing the joining surface 2 of the dissimilar alloy 1 with the molten metal. When the heating is sufficient, FIG. As shown in b), a so-called pouring preheating method has been proposed in which the discharge port of the molten metal is closed, the molten metal (FC) is cast into the joining pouring portion 6 above the joining surface 2 and the cast iron 4 is joined onto the dissimilar alloy 1. ing.

[0004] However, the pouring preheating method is practical for a large vessel because the molten metal is wasted, but is expensive for a small vessel and is not practical.

[0005] As shown in FIG. 3, a method of preheating by applying a voltage to the dissimilar alloy 1 is conceivable in place of the pouring preheating method, but it is expensive and difficult to put to practical use.

[0006]

SUMMARY OF THE INVENTION In view of the above situation, the present invention is excellent in that it is possible to preheat different kinds of alloys very easily at a low cost without requiring equipment costs, and the joining strength is remarkably improved. It is an object of the present invention to provide a method for joining a cast metal and a dissimilar alloy.

[0007]

The gist of the present invention will be described with reference to the accompanying drawings.

[0008] The joint surface 2 of the dissimilar alloy 1 steel to be joined is subjected to thermal spraying, and the dissimilar alloy 1 steel is disposed and fixed in the middle stage of the mold 3.
Then, a joint injection part 6 is formed on the upper part of the dissimilar alloy 1.
At the same time, in the lower part, the joint surface 2 of the dissimilar alloy 1 is preheated.
Sufficient molten metal to form a preheating injecting section 5 capable of injecting the molten metal of cast iron 4 joining preheated heterogeneous alloy 1 cast in a said preheating injecting section 5, the bonding surface 2 dissimilar alloy 1 is heated after, relates to a method of bonding cast heterologous alloy, characterized in that joining the cast iron 4 and heterogeneous alloys 1 steel is cast a melt of cast iron 4 on the bonding injection portion 6 in contact with the bonding surface 2 is there.

[0009]

In this embodiment, for example, steel (J
This is joined to the upper surface of S50C) in IS standard
As a dissimilar alloy 1, a casting 4 ( cast iron 4 (F
C)) is the case where the present invention is applied.

A schematic configuration diagram of this embodiment will be described below with reference to FIG.

First, the upper surface which is the bonding surface 2 of the dissimilar alloy 1 is subjected to thermal spraying.

This thermal spraying treatment is to increase the bonding strength, and performs gas flame spraying or supersonic gas flame spraying of a Ni self-fluxing alloy on the bonding surface 2 of steel (S50C).

This gas flame spraying is, for example, for
This is a method in which a sprayed torch is sprayed into a fuel mixture gas from a spray torch to a joining surface, and the sprayed material powder is blown onto the joining surface to form a coating.

In the supersonic gas flame spraying, a high-quality coating is formed on a joint surface by spraying a sprayed powder material at a supersonic speed.

Next, in the present embodiment, the dissimilar alloy 1 having the joint surface 2 sprayed thereon is disposed and fixed at a middle position in the mold 3 with the joint surface 2 facing upward, and a joint injection portion 6 is formed above the dissimilar alloy 1. At the same time, a preheating injection portion 5 is formed at the lower portion, which can inject a molten metal sufficient to preheat the bonding surface 2 of the dissimilar alloy 1.

Then, first, the lower preheating injection section 5
The molten metal of the cast iron 4 is poured, the high temperature of the molten metal heats the dissimilar alloy 1, and after the heat is conducted to the joining surface 2 of the dissimilar alloy 1, the molten metal of the cast iron 4 is then fed to the upper joint injection portion 6. Cast.

[0017] Accordingly, since the joining surface 2 of the dissimilar alloy 1 is cast in a preheated state, and the joining surface 2 of the dissimilar alloy 1 has been subjected to thermal spraying in advance, a joint having extremely strong joining strength is obtained. Can be done.

In addition, according to the present embodiment, the preheating means only needs to simply draw the molten metal of the cast iron 4 and inject it into the lower side of the dissimilar alloy 1, and the preheating means is used for this preheating.
Since the cast iron 4 and the lower surface of the dissimilar alloy 1 are cast without preheating, they are not joined and are easily separated from the upper joint.

Incidentally, the applicant changed various materials and dimensions, and compared and experimented with the method of the prior art shown in FIG. The tensile strength of the object and the cut surface of the joined part are confirmed by cutting.The joint strength is clearly higher than that of the conventional casting preheating method, and the joint strength is superior to that of the simple joining method using only thermal spraying. Confirmed that it was.

[0020]

Since the present invention is constructed as described above, it is possible to reduce the cost by extremely simple means without using equipment costs and the like, to reduce the cost, and to obtain a casting excellent in joining strength as compared with the conventional method. And a dissimilar alloy joining method.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of the present embodiment.

FIG. 2 is a schematic configuration diagram of a conventional pouring preheating method.

FIG. 3 is a schematic configuration diagram of a conventional electric preheating method.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Dissimilar alloy 2 Joining surface 3 Mold 4 Cast iron (casting) 5 Injection part for preheating 6 Injection part for joining

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Takeshi Kato 420-6, Enomachi, Miyashita-cho, Nagaoka-shi, Niigata Examiner Shinagawa Casting Co., Ltd. Kimikohiko Kim (56) References JP-A 64-28356 A) JP-A-58-181644 (JP, A) JP-A-61-60255 (JP, A) JP-A-6-226424 (JP, A) JP-A-59-220271 (JP, A) JP-A-2 -205247 (JP, A) JP-A-58-112649 (JP, A) JP-A-58-38654 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B22D 19/00 B22D 19/04

Claims (1)

(57) [Claims] Claims: 1. A joint surface of a dissimilar alloy steel to be joined is subjected to a thermal spray treatment, and the dissimilar alloy steel is arranged and fixed in a middle stage of a mold .
While forming a joint injection part on the upper part of this dissimilar alloy,
The lower part is filled with molten metal sufficient to preheat the joint surface of the dissimilar alloy.
Forming an injection part for preheating can enter, the cast iron melt joining
Preheating the heterologous alloy is cast into the preheating injection unit, and after the joining surfaces of the dissimilar alloy is heated, cast iron and heterogeneous alloys by casting the cast iron melt in the joint for injection portion in contact with the bonding surface Steel And a method for joining a casting and a dissimilar alloy.