KR20190103526A - Mold with heat insulation function - Google Patents

Abstract

According to the present invention, a mold comprises a mold main body formed in a shape corresponding to a molding to be manufactured and having a molding space in which molten metal is injected; and a heat retention part which is an empty space formed inside the mold main body, and which communicates with the molding space such that the molten metal is introduced into the molding space. A solidification rate of the molten metal injected into the molding space around the heat retention part by the molten metal introduced into the heat retention part is reduced such that the mold itself is capable of performing the heat retention function using the heat of the molten metal flowing into the heat retention part.

Description

Mold with heat insulation function

The present invention relates to a mold having a heat insulating function, and more particularly, a heat insulating part having an empty space is formed inside the main body of the mold to solidify the molten metal around the heat insulating part by the heat of the molten metal which is introduced into and received in the heat insulating part during casting. The present invention relates to a mold having a warming function, which can perform a warming function by itself by reducing a speed.

Casting refers to a work or a product in which a molten metal, that is, a molten metal is put in a mold, cooled, and solidified into a desired shape (cast). The material of the mold is made of sand, metal and the like, and is produced by injecting molten metal into the mold by gravity, pressure, centrifugal force, or the like.

Since the molten metal injected into the mold during the casting process starts to solidify from the surface of the molten metal and the interface with the mold, and the volume decreases as the solidification proceeds, shrinkage holes due to the solidification of the metal may be generated at the last solidified part. .

These shrinkage holes can act as a defect in the cast product, so to prevent this, typically forms a hot water that can provide an extra melt at the shrinking site. Since the molten metal must be able to flow into the shrinkage hole, the molten metal of the molten metal must be finally solidified, and thus, a thermal insulating material or a thermal insulating material may be provided around the molten metal to maintain the molten state.

In addition, cold metal is installed together to rapidly solidify the place far from the hot water so that the hot water of the hot water finally solidifies.

However, there is a problem in that it is difficult to apply cold or hot water due to the complicated shape of the casting, and even if cold or hot water is used, shrinkage defects in the casting due to solidification isolation of the casting (or mold) cannot be completely eliminated. It still remains.

Japanese Laid-Open Patent Publication 1995-323350

The present invention has been made in order to solve the above problems, an object of the present invention is to form a heat insulating portion that is an empty space into which the molten metal can be introduced into the mold body, the heat is introduced into the warming portion by introducing the molten portion to the warming portion It is to provide a mold with a heat retaining function for reducing the solidification rate of the melt forming the casting around the heat retaining portion by its own heat.

In order to achieve the above object, the mold with a thermal insulation function according to the present invention is formed in a form corresponding to the casting to be manufactured, the mold body having a casting space in which molten metal is injected; And an insulating portion formed inside the mold body, the insulating portion being in communication with the casting space and into which the molten metal injected into the casting space flows. The solidification rate of the molten metal injected into the casting space can be reduced.

Here, the heat insulating part may be formed in at least one predetermined area of the mold body.

Here, the thermal insulation portion, the space portion which is the main space in which the molten metal is introduced; And a communicating part communicating the casting space with the space part.

Here, the communicating part may be formed to communicate with a region in which the molten metal in the casting space is formed as a high temperature part during casting.

Here, when the casting space is formed to include the thick portion space and the thin portion space, the insulation portion may be formed in a position close to the thin portion space.

Here, the insulating part may be formed in plural in a position close to the thin portion space, or may be formed in a form surrounding the thin portion space in the circumferential direction.

Here, the insulating portion may be formed in a form in which the thickness gradually increases from one side to the other side.

Here, the heat insulating part may be formed at a position close to the casting space corresponding to a region where shrinkage defects may occur in the casting.

Here, in the casting may be further provided with hot water and / or cold.

Here, the mold may be a three-dimensional printed matter.

On the other hand, the computer-readable recording medium according to an embodiment of the present invention can be loaded into the memory of the three-dimensional printing apparatus, and when executed in the three-dimensional printing apparatus, the above-described mold may be manufactured as printed matter by three-dimensional printing. Can be.

Mold having a heat insulation function according to an embodiment of the present invention, the molten metal is introduced into and received in the heat retaining portion to reduce the solidification rate of the molten metal in the casting space around the heat retaining portion by the heat of the molten metal, thereby performing the self-heating function of the mold It can work.

Accordingly, it is possible to cause solidification to occur in a desired direction in the casting, so that shrinkage defects due to solidification isolation and the like in the casting can be removed, thereby improving the quality and reliability of the casting.

In addition, the present invention does not require a separate thermal insulation material or a heating insulation material to slow down the solidification rate of the molten metal, and by using the molten metal that is merely a casting material, it is possible to reduce the casting process cost and simplify the casting process step. There is an advantage.

1 is an exemplary view showing a cross section of a mold having a heat insulation function according to an embodiment of the present invention.
2 is an exemplary view showing a cross section of a mold having a heat insulation function according to a first embodiment of the present invention.
3 is an exemplary view showing a cross section of a mold having a heat insulation function according to a second embodiment of the present invention.
4 is an exemplary view showing a cross section of a mold having a heat insulation function according to a third embodiment of the present invention.
Figure 5 is an exemplary view showing an embodiment of a mold with a thermal insulation function of the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail a mold with a thermal insulation function according to the present invention. The drawings introduced below are provided by way of example so that the spirit of the invention to those skilled in the art can fully convey. Accordingly, the present invention is not limited to the drawings presented below and may be embodied in other forms, and the drawings presented below may be exaggerated to clarify the spirit of the present invention. At this time, if there is no other definition in the technical terms and scientific terms used, it has a meaning commonly understood by those of ordinary skill in the art to which the present invention belongs, the gist of the present invention in the following description and the accompanying drawings Descriptions of well-known functions and configurations that may be unnecessarily blurred are omitted.

1 is an exemplary view showing a cross-section of a mold having a heat insulating function according to an embodiment of the present invention, as shown, the mold 10 of the present invention is largely the mold body 100 and the heat insulating part 200 It may be formed to include.

The mold main body 100 is a mold in which a casting space 110 having a shape corresponding to a casting to be manufactured is formed therein, and a casting is manufactured by injecting and solidifying molten metal into the casting space 110.

The mold 10 of the present invention includes a thermal insulation portion 200, where the thermal insulation portion 200 is in communication with the casting space 110 to provide a space in which the molten metal can be received and accommodated. That is, the heat insulating part 200 is an empty space formed inside the mold main body 100, and may be formed in a shape in which an inner surface thereof is closed to allow the molten metal to be introduced and received from the casting space 110.

According to the present invention, when molten metal is injected into the casting space 110 of the mold main body 100 during casting, a part of the molten metal is introduced into the thermal insulation unit 200 and accommodated, and the molten metal is introduced and accommodated in the thermal insulation unit 200. The solidification rate of the molten metal in the casting space 110 around the heat retaining part 200 may be reduced by the heat of.

That is, the molten metal has high thermal energy as a molten metal, and the molten metal is accommodated in the thermal insulation unit 200, so that the thermal insulation effect of continuously dissipating heat around the thermal insulation unit 200 occurs. The solidification rate of the molten metal in the casting space 110 around the 200 can be reduced.

In the present invention, the heat insulating part 200 is formed in a predetermined region of the mold main body 100, and may be formed at least one.

The mold 10 may be formed to produce a variety of complex castings, wherein the casting is composed of a thick thick portion and a thin thin portion. The casting space 110 of the mold main body 100 may also include a thick portion space and a thin portion space.

In general, more molten metal is gathered in the thicker space than the thinned space to form a high temperature part, so that the molten metal in the thickened space proceeds at a slower solidification rate than the molten metal in the thinned space.

At this time, as described above, during casting, solidification may finally occur in the molten metal to induce shrinkage defects in the molten metal to prevent shrinkage defects in the casting, and the thinner space is located between the two thicker spaces. When formed as a passageway connecting the meat spaces, the molten metal of the thinner space solidifies faster than the molten metal of one thicker space (e.g., the thicker space with a greater distance from the melt). The molten metal is isolated, and thus the molten metal in the isolated thickened space may solidify before the molten metal in the molten metal so that shrinkage defects may occur in the casting.

Accordingly, the present invention reduces the solidification rate of the molten metal in the casting space 110 around the thermal insulation portion 200 by forming the thermal insulation portion 200 at a predetermined position in consideration of this point, thereby causing shrinkage defects in the casting. It can be prevented.

In addition, in the molten metal injected into the casting space 110 at the time of casting, a plurality of thermal insulation parts 200 may be formed so as to correspond to a plurality of portions that locally need to suppress the solidification rate of the molten metal.

Looking in more detail with respect to the heat retaining portion 200 in the present invention, as shown in Figure 1, the main portion (210), the casting space 110 and the space, the main space (main) space in which the molten metal is introduced The communication unit 220 may communicate with the unit 210.

The communication unit 220 communicates the space 210 and the casting space 110 to perform a function of a passage for introducing a molten metal injected into the casting space 110 into the space 210 when casting, 210 is an empty space in which most of the molten metal flowing into the heat insulating part 200 is accommodated, and the shape, size, position, and number thereof may be variously modified in consideration of solidification aspects of the molten metal forming a casting. have.

Here, the thermal insulation unit 200 is to prevent the defects are formed in the casting and should be removed after the casting is completed, in order to easily remove the thermal insulation unit 200 between the space 210 and the casting space 110 It is advantageous that the connecting portion, that is, the communication portion 220 for introducing the molten metal in the casting space 110 into the space 210 is narrow and thin.

The shape, size, and the like of the communication unit 220 may be variously changed, and one or more communication units 220 may be provided in one space 210 in consideration of the size and / or shape of the space 210. May be formed.

On the other hand, when the molten metal is injected into the casting space 100 during casting, the temperature distribution of the molten metal in the casting space 100 may be differently formed according to its position, and thus may be formed as a relatively high temperature region and a low temperature region.

In this case, the temperature of the molten metal flowing into the space 210 through the communication unit 220 is different according to the temperature of the molten metal in the casting space 100 at the portion where the communication unit 220 communicates with the casting space 100. In order to maximize the effect of the insulating part 200, the communicating part 220 is preferably formed to communicate with a region in which the molten metal in the casting space 100 is formed as a high temperature part.

Hereinafter, various embodiments of the mold 10 according to the present invention will be described.

2 is an exemplary view showing a cross section of a mold having a heat insulation function according to a first embodiment of the present invention. As shown, the casting space 110 includes a thick portion space T and a thin portion space S. As shown in FIG. When formed to include, the heat retaining portion 200 may be formed in a position close to the thin portion space (S).

Here, when the molten metal is introduced into the thermal insulation portion 200, it means that the heat of the molten metal in the thermal insulation portion 200 is formed at a position close enough to reach the molten metal of the casting space 110. Meaning, it means that is formed in a suitable position in consideration of the durability of the mold body 100, etc. together.

As the heat insulating part 200 is formed to be close to the thin part space S as in the first embodiment of the present invention, the thin part space S by the heat insulating effect by the heat of the molten metal accommodated in the heat keeping part 200. The solidification speed of the molten metal can be slowed down, and casting defects due to solidification isolation of the thin portion space S can be prevented.

Here, a plurality of independent thermal insulation unit 200 is formed in a position close to the thin portion (S), or the thermal insulation portion 200 is formed in a shape surrounding the thin portion space (S) in the circumferential direction of the thin portion space , The thermal insulation effect to the molten metal in the thin portion space (S) by the thermal insulation unit 200 can be further increased.

3 is an exemplary view showing a cross section of a mold having a heat insulation function according to a second embodiment of the present invention, as shown in the heat insulation portion 200 in a form that gradually increases in thickness from one side to the other side Can be formed.

That is, the cross-sectional area perpendicular to the direction from one side to the other side gradually increases from one side to the other side, so that the amount of the molten metal accommodated in the heat insulating part 200 also gradually increases from one side to the other side. Will increase.

Therefore, in the solidification step after the injection of the molten metal in the casting space 110 is completed during casting, one side of the thin thickness of the heat insulating part 200 solidifies faster than the other side of the thick thickness, and thus the heat insulating part 200 and The molten metal in the corresponding casting space 110 in close proximity may also cause solidification from one side to the other side, thereby generating directional solidification in the casting. That is, the molten metal to form the casting using the form of the thermal insulation portion 200 can be made to solidify with a directivity.

4 is an exemplary view showing a cross section of a mold having a heat insulation function according to a third embodiment of the present invention. In general, the casting is complicated in shape, it is difficult to completely eliminate the occurrence of shrinkage defects in the casting due to its structure. In such a case, it is preferable that shrinkage defects occur in a place where a defect may occur relatively in a casting, and the heat insulating part 200 is located at a position close to the corresponding casting space 110 in order to induce a shrinkage defect. Can be formed.

Accordingly, the molten metal in the casting space 110 proximate to the thermal insulation portion 200 is slowly solidified by the heat of the molten metal accommodated in the thermal insulation portion 200, so that shrinkage defects may occur at a desired portion in the casting. Here, the place where a defect may occur in the casting may be, for example, a place corresponding to the unprocessed surface in the casting process after completion of casting, but is not limited thereto.

Figure 5 is an exemplary view showing an embodiment of a mold with a thermal insulation function of the present invention, the mold 10 of the present invention is further provided with a hot water 20 and / or cold metal 30 at the time of casting and / or Or cold metal.

As described above, it is common to install a hot dip during casting to induce a shrinkage defect in the hot dip to prevent shrinkage defects in the casting.

In order for shrinkage defects to occur in the molten metal, the molten metal must finally solidify (ie, solidification direction is formed), and for this purpose, cold metals may be installed together to solidify the molten metal from a distance from the molten metal.

However, the casting manufactured through casting is not limited in shape, and thus, when the casting is formed in a complicated shape as illustrated, the casting space 110 is also complicated.

In this case, even if cold metal is used, there is a limit to the cooling effect even inside the casting space 110 having a complicated shape, and in some cases it is difficult to apply cold metal.

At this time, the present invention can form a heat retaining portion 200 in the mold main body 100, it is possible to supplement the place where the effect of the cold in the casting space (110) does not.

That is, the principle of cold metal is to increase the solidification rate of the molten metal in the desired specific part and the final goal is to cause the solidification finally occurs in the molten metal, the present invention is to form a thermal insulation unit 200 between the cold metal and the molten metal By decreasing the solidification speed of the molten metal around the heat retaining part 200, the molten metal can be solidified in a direction from the cold metal to the molten metal.

Here, the position, shape, size, etc. of the heat retaining part 200 may be formed as in the first to third embodiments described above, but it is obvious that the present invention may be appropriately modified in various ways.

As described above, according to the present invention, solidification may finally occur in the hot water by appropriately combining the heat retaining part 200 together with cold metal and hot water, and thus castings due to solidification isolation occurring in the casting space 110 may be formed. The defect can be more reliably prevented.

In addition, the principle of the cold metal and the heat insulating part 200 is to form a solidification direction of the molten metal during casting, in that the complementary relationship does not use a plurality of cold metals, and reduces the number of cold metals to the mold body 100. By forming the heat insulating part 200, since the same effect as using a plurality of cold metals can be expected, the number of cold metals can be reduced, which is economically advantageous.

The mold 10 according to an embodiment of the present invention may be a three-dimensional printed matter.

The present invention includes a computer readable recording medium which can be loaded into a memory of a three-dimensional printing apparatus and, when executed in a three-dimensional printing apparatus, the above-described mold 10 is made of printed matter by three-dimensional printing. That is, the present invention includes a computer readable recording medium storing three-dimensional data in which the above-described mold 10 is made of printed matter by three-dimensional printing.

The three-dimensional data of the mold 10 may be generated through a three-dimensional drawing tool such as CAD, three-dimensional modeling software, or three-dimensional scanner.

The present invention includes a three-dimensional printing apparatus including a computer-readable recording medium in which the three-dimensional data described above is stored.

The present invention includes a method for producing a three-dimensional printed matter, which is the above-described mold 10 using three-dimensional printing.

The above-mentioned three-dimensional printed matter may include a three-dimensional sand printed matter, a three-dimensional ceramic printed matter, a three-dimensional wax printed matter, a three-dimensional metal printed matter, and the like. The above-described three-dimensional printing apparatus may include a three-dimensional sand printing apparatus, a three-dimensional ceramic printing apparatus, a three-dimensional wax printing apparatus, a three-dimensional metal printing apparatus, and the like.

In the above-described method for producing a three-dimensional printed matter, three-dimensional sand printing, as known, can be performed by laminating and binding a substance (including particulate matter) into a layer by layer according to the three-dimensional data described above. Can be. As an example based on three-dimensional sand printing, three-dimensional sand printing may be performed by removing sand that is not binder jetted after the sand layer generation and the binder jetting are repeatedly performed.

More specifically, the three-dimensional sand printing is to laminate and cure one by one using a binder solution as a binder jetting head to a mold material mixed with a binder which binds the mold sand, and to separately manufacture a wooden mold or a mold that becomes a circle of the casting. It is possible to manufacture the mold directly without reducing the production time and cost reduction effect of the casting, it is possible to form a mold with a higher dimensional accuracy than the mold manufacturing using a conventional mold or mold, and further to form a draft There is no need, and the shape of the mold can be freely formed.

As such, the mold 10 of the present invention is a printed matter printed by a three-dimensional sand printing apparatus, and the heat insulating part 200 is not limited to the size, position, and number of the heat insulating part 200 on the mold main body 100. Can be formed.

As described above, the present invention can reduce the solidification rate of the molten metal in the casting space 110 in the region adjacent to the heat retaining portion 200 by the mold 10 includes the heat retaining portion 200, As a result, the solidification direction of the molten metal in the casting space 110 can be controlled to remove the solidification defect in the casting or the position where the solidification defect occurs in the casting is relatively safe even if a shrinkage defect occurs in the casting. It will be able to induce.

In the present invention as described above has been described by specific embodiments and limited embodiments and drawings, but this is only provided to help a more general understanding of the present invention, the present invention is not limited to the above embodiments, the present invention Those skilled in the art can make various modifications and variations from this description.

Accordingly, the spirit of the present invention should not be limited to the described embodiments, but all of the claims that follow, as well as equivalent or equivalent modifications, will fall within the scope of the present invention.

10: mold of the present invention
100: mold body 110: casting space
200: heat insulation portion 210: space portion
220: communication part

Claims (11)

A mold body formed in a shape corresponding to the casting to be manufactured and having a casting space in which molten metal is injected; And
An empty space formed inside the mold body, the heat insulating part communicating with the casting space and into which the molten metal injected into the casting space flows;
And a solidification rate of the molten metal injected into the casting space around the thermal insulation part by the heat of the molten metal flowing into the thermal insulation part.
The method of claim 1,
The heat insulating part is formed with at least one predetermined area of the mold body, the mold with a heat insulating function.
The method of claim 1,
The thermal insulation unit,
A space part which is a main space into which the molten metal is introduced and accommodated; And
A mold having a heat insulating function, comprising: a communicating portion communicating the casting space with the space portion.
The method of claim 3,
The communicating portion,
A mold having a thermal insulation function, which is formed to be in communication with a region in which the molten metal in the casting space is formed at a high temperature portion during casting.
The method of claim 1,
When the casting space is formed including the thick portion space and the thin portion space,
The thermal insulation portion is formed in a position close to the thin portion space, the mold with a thermal insulation function.
The method of claim 5,
The thermal insulation unit,
A mold having a thermal insulation function, which is formed in plural in a position close to the thin portion space or surrounds the thin portion space in a circumferential direction.
The method of claim 1,
The insulation portion is formed in a form that gradually increases in thickness from one side to the other side, the mold with a heat insulation function.
The method of claim 1,
The thermal insulation unit,
A mold having a thermal insulation function, which is formed at a position close to the casting space corresponding to a region where shrinkage defects may occur in the casting.
The method of claim 1,
Mold with heat retention function, which is further provided with hot water and / or cold metal during casting.
The method according to any one of claims 1 to 9,
The mold is a three-dimensional print, the mold with a heat insulation function.
A computer-readable recording medium which can be loaded into a memory of a three-dimensional printing apparatus and, when executed in the three-dimensional printing apparatus, the mold according to claim 10 is manufactured into printed matter by three-dimensional printing.

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