JPH06154995A - Casting method - Google Patents

Abstract

PURPOSE:To obtain a high quality work without cracking on a shell layer and the work by making all pipes flexible, at the time of casting a cast product including the pipes as cast-in by a lost wax method. CONSTITUTION:At the time of casting the work W contg. the pipe as cast-in, all pipes are made flexible pipes P. At the time of manufacturing a shell layer (b) by the lost wax method, as the flexible pipe P is freely expanded/shrunk, the crack is not developed on the shell layer (b). Further, even if molten metal is poured after dewaxing, the flexible pipe P is freely expanded/shrunk and the crack is not developed on the work W. In the step (c), after dipping a wax pattern (x) into slurry (b) for forming the shell layer (b), stuccoing material (silica sand)is spread and applied and dried. This process is repeated service times to form the shell layer (b) having a prescribed thickness on the surface of the wax pattern (x). By this method, the high quality work can be obtd.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a casting method, and more particularly,
The present invention relates to a cast product containing a cast-in-gurus pipe.

[0002]

2. Description of the Related Art Conventionally, for example, in order to obtain a cast product (hereinafter referred to as a work) containing a cast gurney pipe for cooling, the pipe is assembled in a cavity of a mold and the molten metal is poured into the cavity. Is being manufactured.

Further, in the case of a material having a large difference in storage rate between the material of the pipe and the cast stuff, a flexible portion is provided in a part of the pipe in order to prevent cracking or breakage due to the difference in contraction rate between the two. Has also been proposed (for example, JP-A-52)
No. 149225).

[0004]

However, when the work containing the cast gurney hype is manufactured by the lost wax method, cracks are liable to occur even in the step of forming the shell layer, and in the lost wax method, the work containing the cast gurney pipe is produced. Was difficult to make. In order to prevent this cracking, even if a flexible portion is provided in a part of the pipe as in the conventional proposal, it is still impossible to completely prevent the cracking.

Therefore, the present invention has been made in order to eliminate the above-mentioned drawbacks, and an object of the present invention is to provide a casting method capable of producing a work containing a cast gurney pipe by the lost wax method. It is in.

[0006]

In the casting method according to the present invention, in order to achieve the above object, when casting a work containing a cast gurney pipe by the lost wax method, all the pipes are made to be flexible pipes. Is characterized by.

[0007]

In the above operation, the flexible pipe becomes elastic when the shell layer is manufactured by the lost wax method, and the shell layer is not cracked. Further, even if the molten pipe is poured after the dewaxing, the flexible pipe freely expands and contracts and the work is not cracked.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment method of the present invention will be described below with reference to the flow sheet of FIG.

(A) Mold 1 comprising upper mold 1a and lower mold 1b
The flexible pipe P is held and set in the cavity C formed by the spacer S. Then, wax (wax) a is injected into the cavity C.

(B) The mold 1 is unframed and the wax mold B is taken out.

(C) After the wax type a is immersed in the slurry b'for forming the shell layer b, a stucco material (silica sand) is sprinkled, and the first layer is coated and dried.

(D) The above step (c) is repeated several times (usually 6 times).
Repeatedly (up to 7 times), a shell layer b having a predetermined thickness is formed on the surface of the wax type a.

(E) The shell layer b is heated to remove the wax a and form the cavity C in the shell layer b, and the shell layer b is baked and reinforced.

(F) The molten metal is injected into the shell layer b having the cavity C therein, and after the molten metal has been solidified, the frame is unframed to obtain the work W.

FIG. 2 is a front view showing a cross section of a part of the work W produced according to the above flow. That is, this work W is cast in an aluminum alloy by causing a flexible pipe P made of stainless steel having a diameter of 10φ to meander as illustrated.

When the work W was cut along the plane of the flexible pipe P and examined, it was confirmed that the work W was a good work without any cracks or cracks. Of course, neither cracks nor cracks were generated in the shell layer in the process of forming the shell layer.

[0017]

EFFECT OF THE INVENTION The casting method according to the present invention, when casting a work containing a cast-in-guest pipe by the lost wax method, since all of the pipe is made flexible, the shell layer and the work do not have cracks or cracks, You can get quality work.

[Brief description of drawings]

FIG. 1 is a flow sheet of a method according to an embodiment of the present invention.

FIG. 2 is a front view showing a cross section of a part of a work obtained by an experiment.

[Explanation of symbols]

 1 Mold a Wax b Shell layer P Flexible pipe C Cavity S Spacer Brazing type B Mold W Work (cast product)

Claims (1)

[Claims] 1. A casting method, wherein when a cast product containing a cast-in-gurney pipe is cast by the lost wax method, the entire pipe is made into a flexible pipe.