JPH1157935A - Method for cooling cast product in mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply and efficiently cool a cast product in a mold by alloing air to flow, through a chamber connected to a blower arranged at the lower part of the mold, among sand grains in the mold composed of the fine grain of facing sand and coarse grain of backing sand consisting of ceramic sand having a specific grain size. SOLUTION: The mold is composed of the fine grain of facing sand 2 and the coarse grain of backing sand 3. As this backing sand 3, the ceramic send having >=80% of 10-50 mesh grain size is used. Futher, at the lower part of the mold, the chamber 4 connected with the blower (not shown by Figure) is formed. At the time of casting the cast product 1 by pouring molten metal into the mold, the air in the chamber 4 is exhausted or sucked with the blower. By this method, the permeability of the mold is improved and the flow of the air is kept to vertically the fixed direction by arranging the chamber 4 and the cooling effect of the cast product 1 is increased and the cast product is efficiently cooled. Thus, the cooling time of the cast product in the mold is shortened, and the poduction efficiency is improved and the directional solidification is accelerated and qulity is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of cooling a casting in a mold, and more particularly to a method of improving the cooling effect by improving the air permeability of the mold.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG.
As a method of cooling the inside of the mold (cooling method in the mold), there is a method of installing cold gold 5 at the time of molding, or embedding a cooling pipe 6 and cooling by flowing air or water.

[0003]

In the conventional method of cooling in a mold, it is necessary to install cold gold or a cooling pipe at the time of molding, which requires much labor, and the cooling effect is limited to a part of the product. was there.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and is intended to be simple and easy by exhausting or sucking air from a chamber provided under a mold to generate a flow of air between coarse sands. An object of the present invention is to provide an efficient method for cooling a casting in a mold.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a method of cooling a casting in which a casting mold composed of fine-grained sand and coarse sand is used. ~ 50
Using ceramic sand that mesh occupies more than 80%,
And having a chamber connected to the blower below the mold,
It is characterized by flowing air between sand grains.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a conceptual diagram showing the principle of a cooling method in a mold according to the present invention, FIG. 3 is a conceptual diagram showing a cooling method of exhausting from a chamber according to the present invention, and FIG. FIG. 5 is a conceptual diagram showing a cooling method for sucking air into a chamber, and FIG. 5 is a view showing a cooling effect when a cooling method for exhausting air from a chamber according to the present invention is applied, particularly when the pressure in the chamber is set to 0.5 atm. .

In these figures, 1 indicates a cast product, 2 indicates fine-grained skin sand, 3 indicates coarse-grained back sand, and 4 indicates a chamber.

As shown in FIG. 1, a mold is made of fine-grained skin sand 2.
And coarse sand 3. And back sand 3
Is formed of ceramic sand in which 10 to 50 mesh accounts for 80% or more. A chamber 4 is formed below the mold, and the chamber 4 is connected to a blower (not shown). Then, by operating the blower, when air flows along the vertical direction between the sand grains, the air permeability is high, so that effective cooling is performed.

In FIG. 3, the chamber 4 is blown by a blower.
This shows the situation when cooling is performed by exhausting air from the air.
In this way, air flows from above to below in the mold, and cooling is performed. In addition, the cooling proceeds from above to below, and the solidification proceeds from above to below. That is, directional coagulation is promoted.

In FIG. 4, the chamber 4 is blown by a blower.
This shows the situation when cooling is performed by inhaling air into the mold. By doing so, air flows upward from below in the mold, and cooling is performed. Moreover, cooling proceeds from below to above, and solidification proceeds from below to above. That is, directional coagulation is promoted.

FIG. 5 shows a comparison between a temperature condition when cooling is performed according to the present embodiment and a temperature condition when cooling is not performed. As can be seen from this figure, good cooling is achieved by cooling according to the present embodiment.

[0013]

As described in detail with the above embodiments, the present invention relates to a method for cooling a casting in which a casting mold composed of fine-grained skin sand and coarse sand is used. In this case, ceramic sand occupying 80% or more of 10 to 50 mesh was used, and a chamber connected to a blower was provided below the mold to allow air to flow between sand grains.

In the present invention having such a configuration, by using coarse-grained ceramic sand for the back sand, the air permeability of the mold is improved, and the cooling effect is increased. Also, by installing a chamber at the bottom of the mold, keep the air flow in a constant vertical direction,
It can be cooled efficiently. As a result, the cooling period of the casting in the mold can be shortened and the production efficiency improved,
By promoting directional solidification, the quality of the cast product is improved.

If the back sand has a mesh size of 10 mesh or less, there is a problem in the strength of the mold. In the present invention, based on such knowledge, 10 to 50 mesh ceramic sand is used for the back sand.

According to the cooling method in the mold of the present invention, the cooling time in the mold of the casting can be shortened, the production efficiency can be improved, and the quality of the casting can be improved by promoting the directional solidification.

[Brief description of the drawings]

FIG. 1 is a conceptual view showing the principle of a cooling method in a mold according to the present invention.

FIG. 2 is a conceptual diagram showing the principle of a conventional cooling method in a mold.

FIG. 3 is a conceptual diagram showing a cooling method for exhausting air from a chamber according to the present invention.

FIG. 4 is a conceptual diagram showing a cooling method according to the present invention for sucking air from a chamber into a mold.

FIG. 5 is a characteristic diagram showing a cooling effect when a cooling method for exhausting air from a chamber according to the present invention is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casting product 2 Fine-grained skin sand 3 Coarse-grained back sand 4 Chamber 5 Cold gold 6 Cooling pipe

Claims (1)

[Claims] 1. A method of cooling a casting in which a casting mold is composed of fine-grained skin sand and coarse sand backing sand, wherein the backing sand comprises 10-50 mesh ceramic sand occupying 80% or more, A method for cooling a cast product in a mold, comprising a chamber connected to a blower below the mold, and allowing air to flow between sand grains.