JPS61103663A - Casting method of metal pattern - Google Patents

Abstract

PURPOSE:To transfer faithfully a fine pattern to a casting under the evacuation and hermetic pressurization of a casting mold by sucking the air of the casting mold to assist the flow of the molten metal and sucking the generated gas during casting and feeding the air to the casting mold from a top cover imposed thereon to pressurize the molten metal upon completion of casting. CONSTITUTION:A metal pattern 4 provided with vent hole 42 communicating with a recess 41 on the pattern surface is disposed onto a bottom plate 3 provided with a vent hole 31 which is connected at one port to a vacuum pump 8. The air in the vent hole 42 and the spacing between the pattern 4 and the plate 3 is sucked by the pump 8 to assist the flow of molten aluminum 5 in the stage of casting the molten aluminum into the casting mold 1 enclosing the pattern 4 with an outside flask 32 and at the same time the gas generated in the solidifying stage of the molten aluminum 5 is sucked. The top cover 6 having an air feed hole 61 connected at one port to a compressor is imposed to the top end edge of the mold 1 upon ending of casting and the air is fed through the hole 61 to pressurize the molten aluminum 5 in the mold 1, by which the metal pattern is manufactured.

Description

[Detailed description of the invention] (Industrial application field) This invention relates to a mold casting method.

(Prior art) The conventional mold casting method is carried out as shown in Fig. 5.
This is done in the order of A, B, and C.

This mold casting method involves tightening a mold Cft onto a bottom plate with a gas vent a, and then pouring molten aluminum F into a mold e surrounding the mold C with an outer frame d. There is a method to solidify it.

(Problems Solved and Eliminated by the Invention) In the mold e manufactured by this method, the riser effect cannot be obtained because the specific gravity of the aluminum f to be cast is light.

Therefore, the casting surface is poor due to insufficient gunning, and the tRiff pattern on the mold surface is difficult to transfer to the casting.

SUMMARY OF THE INVENTION The present invention aims to eliminate the above-mentioned drawbacks and to provide a mold casting method that allows for a finely finished casting surface and transfer of fine details.

(Means for Solving All Problems) In order to achieve the above object, the present invention provides: - On the bottom plate 3 provided with the gas vent hole 31 whose cutting edge is connected to the vacuum pump;
A mold 4 equipped with a gas vent hole 42 communicating with a recess 41 on the mold surface
t-1 When pouring the molten aluminum 5 into the mold 1, which is arranged so that the gas vent hole 31 and the recess 41 communicate with each other and the mold 4 is surrounded by an outer frame 32, the gas vent hole is opened by the vacuum pump 2. 42 and the air in the gap between the mold 4 and the bottom plate 3 is sucked to help the flow of the aluminum 5, and at the same time the gas generated when the aluminum 4 solidifies is sucked, and when the casting of the aluminum 5 is completed, -force is applied. (b) A top cover 6 having nine air feed holes 61 connected to all the compressors is placed on the upper edge of the mold 1 and sealed by pressing, and air is sent through the air feed holes 61 to melt the aluminum 5 in the mold 1. The machine is configured to pressurize and make molds.

(Embodiment) Hereinafter, one embodiment of the present invention will be described based on the drawings.

Figures 1 to 4 relate to this invention; Figure 1 is a cross-sectional view of the mold 4 placed inside the mold 1, and Figure 2 is a sectional view of the mold 1 in which molten aluminum 5 is cast. FIG. 3 is an explanatory diagram when the mold 1 is closed with the upper lid 6, and FIG. 4 is an explanatory diagram when air 7 is sent into the mold 1.

Hereinafter, a detailed explanation will be given based on FIGS. 1 to 4.

The mold 1 includes a bottom plate 3 on which a mold 4 is placed, and an outer frame 32 surrounding the mold 4.

The bottom plate 3 is placed on the base 2, has a flat top surface, and is provided with a gas vent hole 31. The single blade opening 33 of the gas vent hole 31 is located approximately in the center of the bottom plate 3. The external power port 34 is connected to the vacuum pump 8.

Degree of vacuum of the vacuum pump> Furthermore, a recess 41 is provided on the mold surface of the mold 4, and the mold 4 is provided with one or more gas vent holes 42° communicating with the recess 41. . This mold 4 has a recess 4
1 and the single blade opening 33 of the bottom plate 3 are arranged so as to communicate with each other.

Further, the outer frame 32 has a shape surrounding the mold 4, for example, a rectangular shape, and is arranged on the bottom plate 3.

Next, molten aluminum 5 is poured into the mold 1 from above. When casting this molten aluminum 5, vacuum pump 8
Air is sucked through the gas vent hole 42 and the gap between the mold 4 and the bottom plate 3 to help the flow of the molten aluminum 5 and at the same time to suck the gas generated when the aluminum 5 solidifies. There is.

Furthermore, when the casting of the molten aluminum 5 is finished,
An upper lid 6t is placed on the upper edge of the mold 1 and sealed by pressing.

This upper cover 6 is provided with an air supply hole 61.

The first hole 62 of this air hole 61 is located inside the mold 1.

The other port 63 is connected to the compressor 9.

This compressor 9 sends air to the air feed hole 61 to pressurize the molten aluminum 5 in the mold 1.

A mold 4 is manufactured.

(Function/Effect) According to this invention, during the casting process, the vacuum pump sucks air through the hole and the gap between the mold and the bottom plate to help the flow of molten aluminum, and at the same time, air is generated when the aluminum solidifies. At the end of aluminum casting, the mold is sealed with an upper lid, and air is sent through the air feed hole in the upper lid to pressurize the molten aluminum inside the mold.

This makes it possible to create beautiful casting surfaces that cannot be achieved with conventional casting methods.

In addition, by creating a vacuum inside the concave part of the mold and applying pressure after sealing it, the fine rutted pattern of the mold can be faithfully transferred to the casting.

Furthermore, since there is no problem with the pressurization and vacuuming and poor flow of the molten metal, it is possible to eliminate the phenomenon of rounded corners of the uneven parts, and it is possible to produce castings with rounded corners of the uneven parts. .

Furthermore, by pressurizing the molten metal, a feeder effect can be obtained even if the amount of molten metal is small.

[Brief explanation of drawings]

Figures 1 to 4 relate to this invention and are related to β9.
Figure 1 is a cross-sectional view when the mold is placed inside the μ mold, Figure 2 is an explanatory diagram when all of the molten aluminum is poured into the mold, and Figure 3 is when the upper lid is placed on the mold and the mold is sealed. A sectional view, FIG. 4 is an explanatory view when air is sent into the mold, and FIG. 5 is an explanatory view of a conventional embodiment. Applicant: Vacuum Mold Industry Co., Ltd. No. 1
Figure 2

Claims (1)

[Claims] A mold (4) equipped with a gas vent hole (42) communicating with a recess (41) in the mold surface is mounted on a bottom plate (3) equipped with a gas vent hole (31), one opening of which is connected to a vacuum pump. Gas vent hole (
When pouring the molten aluminum (5) into the mold (1), which is arranged so that the mold (4) and the recess (41) communicate with each other, and the mold (4) is surrounded by an outer frame (32), a vacuum pump is used. The air in the gas vent hole (42) and the gap between the mold (4) and the bottom plate (3) is sucked to help the flow of the aluminum (5) and at the same time suck the gas generated when the aluminum (4) solidifies. death,
When the casting of aluminum (5) is completed, a top lid (6) having an air feed hole (61) connected to a compressor at one end is placed on the upper edge of the mold (1) and then sealed by pressing. Air is sent through the air feed hole (61) to fill the mold (1).
) is a mold casting method characterized by pressurizing molten aluminum (5) to produce a mold.