KR102431732B1 - Piston core mold apparatus - Google Patents

Abstract

The present invention relates to a piston core mold device that allows the cooling rate of molten metal to be greatly improved by flowing the coolant over a wide area along the surface of a mold using a coolant flow passage manufactured by a 3D printer, wherein at least a part of a cavity is forming a core mold body; and a refrigerant passage formed inside the core mold body to cool the molten metal introduced into the cavity, wherein the refrigerant passage includes: a first main hole through which a refrigerant is introduced or discharged; a branch hole portion branching in at least one direction from the first main hole portion; One end is connected to the first branch hole so that the coolant can flow widely along the surface of the core mold body, and the surface is formed along the shape of the surface of the core mold body or is formed in a shape that is widened over a large area corresponding hole; a lamination hole portion connected to the other end of the surface-corresponding hole portion and laminated in at least one direction; and a second main hole connected to the lamination hole, through which the refrigerant is discharged or introduced.

Description

Piston core mold apparatus

The present invention relates to a piston core mold apparatus, and more particularly, a piston capable of greatly improving the cooling rate of molten metal by flowing the refrigerant over a wide area as possible along the surface of the mold using a refrigerant flow passage manufactured by a 3D printer. It relates to a core mold apparatus.

In general, automobiles burn gasoline or diesel and liquefied natural gas and use the explosive power to rotate a crankshaft to obtain driving power, and an internal combustion engine (hereinafter, engine called) is equipped. In the engine, a cylinder block forming a plurality of cylinders, a cylinder head provided on the upper part of the cylinder block to provide a combustion chamber, and a cylinder mounted in the cylinder, while reciprocating up and down the cylinder, are generated during the expansion process due to the explosion. There is provided a piston for an internal combustion engine that receives high-temperature and high-pressure gas pressure and transmits it to the crankshaft through a connecting rod. Such a conventional piston for an internal combustion engine is composed of a crown portion, a boss portion, and a skirt portion, and is manufactured by a piston die device.

On the other hand, the conventional piston mold apparatus is made of a plurality of pieces, for example, may be made of a left-hand and right-type in charge of the upper surface and outer diameter of the piston, and a core mold in charge of the lower surface of the piston.

However, in general, the lower surface of the piston is three-dimensionally very complicated in shape due to the space or the slimming space for accommodating the piston pin and the connecting rod. There were many problems, such as a weak point where the strength or durability of the piston was weakened as the cooling rate was partially slowed.

The idea of the present invention is to solve these problems, and a refrigerant flow path such as a branch hole branching from the main hole part into several branches and a corresponding hole part widened along the surface of the mold is formed with a 3D printer to form a mold corresponding to the molten metal. An object of the present invention is to provide a piston core mold device capable of uniform cooling over the entire surface area, refining the structure by greatly improving the cooling rate, and greatly improving the strength and durability of the piston. However, these problems are exemplary, and the scope of the present invention is not limited thereto.

A piston core mold apparatus according to the spirit of the present invention for solving the above problems, the core mold body forming at least a portion of the cavity; and a refrigerant passage formed inside the core mold body to cool the molten metal introduced into the cavity, wherein the refrigerant passage includes: a first main hole through which a refrigerant is introduced or discharged; a branch hole portion branching in at least one direction from the first main hole portion; One end is connected to the first branch hole so that the coolant can flow widely along the surface of the core mold body, and the surface is formed along the shape of the surface of the core mold body or is formed in a shape that is widened over a large area corresponding hole; a lamination hole portion connected to the other end of the surface-corresponding hole portion and laminated in at least one direction; and a second main hole connected to the lamination hole, through which the refrigerant is discharged or introduced.

In addition, according to the present invention, the core mold body, the central body; a front body positioned in front of the central body to facilitate removal of the mold, and detachably installed with the central body; and a rear body positioned at the rear of the central body to facilitate removal of the mold, and detachably installed with the central body.

In addition, according to the present invention, the refrigerant passage portion, the central passage portion formed in the central body; a front flow path formed in the front body; and a rear flow path formed in the rear body.

In addition, according to the present invention, the central flow path portion, the central first main hole portion, the central branch hole portion, the center surface corresponding hole portion, the central lamination hole portion and the central second main hole formed in the interior of the central body may include.

In addition, according to the present invention, the front flow path portion, the front first main hole formed in the interior of the front body, a front branch hole portion, a front surface corresponding hole portion, the front lamination hole portion and the front second main hole portion may include.

In addition, according to the present invention, the rear flow path portion, the rear first main hole formed in the interior of the rear body, a rear branch hole portion, a rear surface corresponding hole portion, a rear lamination hole portion and a rear second main hole portion may include.

In addition, according to the present invention, the core mold body, the central body; a left body located on the left side of the central body to facilitate removal of the mold, and detachably installed with the central body; and a right body positioned on the right side of the central body to facilitate removal of the mold and detachably installed with the central body.

In addition, according to the present invention, the refrigerant passage portion, the central passage portion formed in the central body; a left flow path formed in the left body; and a right flow path formed in the right body.

In addition, according to the present invention, the central flow path portion, the central first main hole portion, the central branch hole portion, the center surface corresponding hole portion, the central lamination hole portion and the central second main hole formed in the interior of the central body may include.

In addition, according to the present invention, the left flow path portion may include a left first main hole portion, a left branch hole portion, a left surface corresponding hole portion, a left lamination hole portion and a left second main hole portion formed in the interior of the left body.

In addition, according to the present invention, the right channel portion, the right first main hole formed in the inside of the right body, the right branch hole portion, the right surface corresponding hole portion, the right lamination hole portion and the right second main hole portion may include.

In addition, according to the present invention, a sliding rail may be formed to be elongated in the longitudinal direction on the central body or the left body and the right body so that the central body can be easily separated by sliding.

In addition, according to the present invention, the refrigerant passage portion, at least one distribution protrusion formed in the surface-corresponding hole portion, and collides with the coolant to evenly distribute the flow of the coolant; may further include.

In addition, according to the present invention, the distribution protrusion may be formed in a cylindrical shape to connect one inner wall and the other inner wall of the surface-corresponding hole to each other.

Also, according to the present invention, the distribution protrusions may be dispersedly arranged in M rows and N columns to be spaced apart from each other, and columns and columns or rows and rows may be shifted from each other so that the refrigerant forms turbulence.

In addition, according to the present invention, the core mold body and the refrigerant passage portion may be a multi-layer structure formed in multi-layer using a 3D printer.

According to some embodiments of the present invention made as described above, a refrigerant flow path such as a branch hole branching into several branches from the main hole portion and a corresponding hole portion widened along the surface of the mold is formed with a 3D printer to form a mold corresponding to the molten metal It is possible to uniformly cool the entire surface area of is to have Of course, the scope of the present invention is not limited by these effects.

1 is an external perspective view showing a piston core mold apparatus according to some embodiments of the present invention.
FIG. 2 is an exploded perspective view showing the piston core mold apparatus of FIG. 1 .
3 is a perspective view showing a refrigerant flow path of the piston core mold apparatus of FIG. 1 .
4 is a front view showing a refrigerant flow path of the piston core mold apparatus of FIG. 3 .
FIG. 5 is a side view illustrating a refrigerant flow path of the piston core mold apparatus of FIG. 3 .
6 is a cross-sectional view showing a refrigerant flow path of the piston core mold apparatus of FIG. 1 .
7 is an external perspective view showing a piston core mold apparatus according to some other embodiments of the present invention.
FIG. 8 is an exploded perspective view of parts showing the piston core mold apparatus of FIG. 7 .
9 is a cross-sectional view showing a refrigerant flow path of the piston core mold apparatus of FIG. 7 .

Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Examples of the present invention are provided to more completely explain the present invention to those of ordinary skill in the art, and the following examples may be modified in various other forms, and the scope of the present invention is as follows It is not limited to an Example. Rather, these embodiments are provided so as to more fully and complete the present disclosure, and to fully convey the spirit of the present invention to those skilled in the art. In addition, in the drawings, the thickness or size of each layer is exaggerated for convenience and clarity of description.

The terminology used herein is used to describe specific embodiments, not to limit the present invention. As used herein, the singular form may include the plural form unless the context clearly dictates otherwise. Also, as used herein, “comprise” and/or “comprising” refers to the presence of the recited shapes, numbers, steps, actions, members, elements, and/or groups of those specified. and does not exclude the presence or addition of one or more other shapes, numbers, movements, members, elements and/or groups.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings schematically illustrating ideal embodiments of the present invention. In the drawings, variations of the illustrated shape can be envisaged, for example depending on manufacturing technology and/or tolerances. Accordingly, embodiments of the inventive concept should not be construed as limited to the specific shape of the region shown in the present specification, but should include, for example, changes in shape caused by manufacturing.

Hereinafter, a piston core mold apparatus according to some embodiments of the present invention will be described in detail with reference to the drawings.

1 is an external perspective view showing the piston core mold apparatus 100 according to some embodiments of the present invention, and FIG. 2 is an exploded perspective view of parts showing the piston core mold apparatus 100 of FIG. 1 .

First, as shown in FIGS. 1 and 2 , the piston core mold apparatus 100 according to some embodiments of the present invention may largely include a core mold body 10 and a refrigerant passage part 20 . .

For example, as shown in FIGS. 1 and 2 , the core mold body 10 may be a core mold body that forms at least a portion of a lower cavity corresponding to the lower surface of the piston.

More specifically, for example, as shown in FIGS. 1 and 2 , the core mold body 10 may be made of three pieces, and a central body 10-1 that serves as the center of the cavity. And, located in front of the central body (10-1) to facilitate removal of the mold, the front body (10-2) installed detachably from the central body (10-1), and the center to facilitate removal of the mold It is located at the rear of the body 10-1, and may include a rear body 10-3 that is detachably installed with the central body 10-1.

In addition, as shown in FIGS. 1 and 2 , the core mold body 10 of the present invention has the central body 10-1 or the front body so that the central body 10-1 can be easily separated by sliding. A sliding rail R may be formed in the longitudinal direction at (10-2) and on the rear body (10-3).

Therefore, for example, when the shape of the core mold body 10 is very complex in three dimensions, a phenomenon in which the piston cooled and solidified in the molten metal is bound without being separated from the core mold body 10 may occur. , At this time, in the core mold body 10 of the present invention, first, the central body 10-1 is first slidably separated, and then the front body 10-2 and the rear body 10- are freed. 3) can be separated later, so that sequential separation is possible, which facilitates the piston ejection process and increases the degree of freedom in piston design.

However, the core mold body 10 is not necessarily limited to being formed of three pieces, and may be composed of a very diverse number of pieces depending on the shape of the piston or the casting environment, such as being integrally formed or formed of four or more pieces. can

3 is a perspective view showing the refrigerant passage 20 of the piston core mold apparatus 100 of FIG. 1 , FIG. 4 is a front view showing the refrigerant passage 20 of the piston core mold apparatus 100 of FIG. 3 , and FIG. 5 is a side view showing the refrigerant flow path 20 of the piston core mold device 100 of FIG. 3 , and FIG. 6 is a cross-sectional view showing the coolant flow path 20 of the piston core mold device 100 of FIG. 1 .

3 to 6 , the refrigerant passage part 20 is a kind of cooling formed inside the core mold body 10 so as to rapidly cool the molten metal introduced into the cavity through heat exchange. It may be a channel structure.

For example, as shown in FIGS. 3 to 6 , the refrigerant passage part 20 includes a first main hole part 21 through which a refrigerant such as cooling oil or coolant is introduced or discharged, and the first main hole part 21 . A branch hole 22 branching from at least one direction, and one end connected to the first branch hole 22 so that the coolant can flow widely along the surface of the core mold body 10, and the core mold A surface-corresponding hole 23 formed along the shape of the surface of the body 10 or formed in a shape that is widened to a large area, and the other end of the surface-corresponding hole 23, are connected in at least one direction It may include a lamination hole portion 24 to be laminated and a second main hole portion 25 connected to the lamination hole portion 24 through which the refrigerant is discharged or introduced.

More specifically, for example, as shown in FIGS. 1 to 6 , the refrigerant passage part 20 includes the central body 10-1, the front body 10-2, and the rear body 10. -3), the refrigerant passage 20 includes a central passage 20-1 formed inside the central body 10-1, and the front body 10 -2) may include a front flow path portion 20-2 formed inside and a rear flow path portion 20-3 formed inside the rear body 10-3.

For example, as shown in FIGS. 3 and 6 , the central flow path part 20-1 includes a central first main hole part 21-1 formed in the central body 10-1, a central branch hole part ( 22-1), a center surface corresponding hole portion 23-1, a center lamination hole portion 24-1 and a center second main hole portion 25-1 may be included.

Here, as shown in FIGS. 3 to 6 , the central branch hole part 22-1 may extend from the central first main hole part 21-1 and be connected to the central surface-corresponding hole part 23-1. have.

That is, the refrigerant may be uniformly supplied over the entire area of the center surface-corresponding hole 23 - 1 .

Accordingly, the refrigerant is introduced into the central first main hole portion 21-1 and passes through the central branch hole portion 22-1 so that heat exchange is performed as quickly as possible along the surface of the mold in the center surface-corresponding hole portion 23-1. It may flow so as to be made in such a way that it may be merged in the central lamination hole portion 24-1 and discharged through the central second main hole portion 25-1.

In addition, for example, as shown in Figures 3 to 6, the front flow path portion 20-2, the front first main hole portion 21-2 formed in the front body 10-2, the front branch It may include a hole portion 22-2, a front surface corresponding hole portion 23-2, a front lamination hole portion 24-2 and a front second main hole portion 25-2.

Here, as shown in FIGS. 3 to 6 , the front branch hole part 22-2 may extend from the front first main hole part 21-2 and be connected to the front surface corresponding hole part 23-2. have.

That is, the refrigerant can be supplied so that the refrigerant can be uniformly supplied over the entire area of the front surface corresponding hole 23 - 2 .

Accordingly, the refrigerant is introduced into the front first main hole portion 21-2, passes through the front branch hole portion 22-2, and spreads to the largest area along the surface of the mold in the front surface corresponding hole portion 23-2. The flow may be dispersed and flowed so that heat exchange can be performed quickly, and may be merged in the front lamination hole part 24-2 and discharged through the front second main hole part 25-2.

In addition, for example, as shown in Figures 3 to 6, the rear flow path portion 20-3, the rear first main hole portion 21-3 formed in the rear body 10-3, the rear branch It may include a hole portion 22-3, a rear surface corresponding hole portion 23-3, a rear lamination hole portion 24-3 and a rear second main hole portion 25-3.

Here, as shown in FIGS. 3 to 6, the rear branch hole 22-3 extends from the rear first main hole 21-3 to be connected to the rear surface corresponding hole 23-3, respectively. can

That is, the refrigerant can be supplied so that the refrigerant can be uniformly supplied over the entire area of the rear surface corresponding hole 23 - 3 .

Accordingly, the refrigerant is introduced into the rear first main hole portion 21-3 and extends through the rear branch hole portion 22-3, and in the rear surface-corresponding hole portion 23-3, along the surface of the mold as much as possible. It can be dispersed and flowed so that heat exchange can be performed quickly over a large area, and then merged in the rear lamination hole part 24-3 and discharged through the rear second main hole part 25-3.

However, the flow form of the refrigerant may be very diverse, such as the inflow or discharge direction of the refrigerant being alternated with each other in the forward direction and the reverse direction, or the inflow or discharge of the refrigerant is mixed and simultaneously performed in both directions.

On the other hand, as shown in FIGS. 3 to 6 , the refrigerant flow path part 20 is formed in the surface-corresponding hole part 23 and collides with the refrigerant to evenly distribute the flow of the refrigerant at least one distribution. It may further include a protrusion (T).

More specifically, for example, as shown in FIGS. 3 to 6 , the distribution protrusion T is formed in a cylindrical shape to connect one inner wall and the other inner wall of the surface-corresponding hole 23 to each other. can

However, the distribution protrusion T is not necessarily limited thereto. For example, it is formed in a polygonal shape, a round protrusion shape, or is formed to be misaligned with one inner wall and the other inner wall, etc., so that the refrigerant can form a turbulent flow. can be formed in the form.

In addition, for example, as shown in FIGS. 3 to 6 , the distribution protrusions T are dispersedly arranged in M rows and N columns to be spaced apart from each other, and columns and columns or rows and rows are arranged so that the refrigerant forms turbulence. They may be displaced from each other.

However, the arrangement of the distribution protrusions T is not necessarily limited thereto, and for example, a zigzag arrangement or arrangement for forming a turbulence, such as a lattice arrangement, may all be applied.

Accordingly, the refrigerant collides with the distribution protrusions (T) while passing between the distribution protrusions (T) and other neighboring distribution protrusions (T) in a zigzag while passing through the surface-widened portion (23), and heat exchange efficiency This high turbulence is formed, and the cooling rate can be further improved due to this turbulence.

The shape of the refrigerant passage part 20 of the present invention may be very complex in three dimensions, and in order to form such a complex structure, the core mold body 10 and the refrigerant passage part 20 are 3D printed It may be a multi-layer structure formed by using a metal material, a synthetic resin material, or the like in multi-layers.

Therefore, according to the present invention, refrigerant passages such as branching holes branching from the main hole and corresponding holes that are widened along the surface of the mold are formed with a 3D printer to uniformly cool the entire surface area of the mold corresponding to the molten metal. The cooling rate can be greatly improved to refine the structure, the strength and durability of the piston can be greatly improved, and the productivity can be greatly improved by increasing the cooling rate.

7 is an external perspective view showing the piston core mold apparatus 200 according to some other embodiments of the present invention, and FIG. 8 is an exploded perspective view of parts showing the piston core mold apparatus 200 of FIG. 7 .

First, as shown in FIGS. 7 and 8 , the piston core mold apparatus 200 according to some embodiments of the present invention may largely include a core mold body 10 and a refrigerant passage part 20 . .

For example, as shown in FIGS. 7 and 8 , the core mold body 10 may be a core mold body that forms at least a portion of a lower cavity corresponding to the lower surface of the piston.

More specifically, for example, as shown in FIGS. 7 and 8 , the core mold body 10 may be made of three pieces, and a central body 10-4 that serves as the center of the cavity. And, located on the left side of the central body (10-4) to facilitate removal of the mold, the left body (10-5) and the central body (10-4) and detachably installed to facilitate removal of the mold and the center It is located on the right side of the body 10-4, and may include a right body 10-6 that is detachably installed with the central body 10-4.

In addition, as shown in Figs. 7 and 8, the core mold body 10 of the present invention has the central body 10-4 or the left body so that the central body 10-4 can be easily separated by sliding. A sliding rail R may be formed in the longitudinal direction at (10-5) and the right body (10-6).

Therefore, for example, when the shape of the core mold body 10 is very complex in three dimensions, a phenomenon in which the piston cooled and solidified in the molten metal is bound without being separated from the core mold body 10 may occur. , At this time, in the core mold body 10 of the present invention, first, the central body 10-4 is first slidably separated, and then the left body 10-5 and the right body 10- are freed. 6) can be separated later, so that sequential separation is possible, thereby facilitating the piston ejection process and increasing the degree of freedom in piston design.

However, the core mold body 10 is not necessarily limited to being formed of three pieces, and may be composed of a very diverse number of pieces depending on the shape of the piston or the casting environment, such as being integrally formed or formed of four or more pieces. can

9 is a cross-sectional view showing the refrigerant passage 20 of the piston core mold apparatus 200 of FIG. 7 .

As shown in FIG. 9 , the refrigerant passage part 20 is a kind of cooling channel structure formed inside the core mold body 10 so as to rapidly cool the molten metal introduced into the cavity through heat exchange. can

For example, as shown in FIG. 9 , as shown in FIGS. 3 and 4 , the refrigerant passage 20 includes a first main hole through which a refrigerant such as cooling oil or cooling water is introduced or discharged, and from the first main hole. A branch hole branching in at least one direction, and one end connected to the first branch hole portion so that the refrigerant can flow widely along the surface of the core mold body, a large area along the shape of the surface of the core mold body A surface-corresponding hole formed in a shape that is widened as a second main that is connected to the other end of the surface-corresponding hole, and is connected to the laminating hole and the laminating hole that are laminated together in at least one direction, so that the refrigerant is discharged or introduced It may include a hole part.

More specifically, for example, as shown in FIG. 9 , the refrigerant passage part 20 includes the central body 10-4, the left body 10-5, and the right body 10-6. As can be formed independently of each other, the refrigerant flow path portion 20 includes a central flow path formed inside the central body 10-4, and the left body 10-5 formed inside. It may include a left flow path part and a right flow path part formed inside the right body 10 - 6 .

For example, the central flow path portion may include a central first main hole portion, a central branch hole portion, a center surface-corresponding hole portion, a central lamination hole portion and a central second main hole portion formed in the central body.

Here, the central branch hole portion may be separated from the central first main hole portion and connected to the central portion, the left end portion, and the right end portion of the center surface corresponding hole portion, respectively.

That is, the refrigerant may be distributed and supplied so that the refrigerant may be uniformly supplied over the entire area of the central surface-corresponding hole portion.

Accordingly, the refrigerant is introduced into the central first main hole and is first dispersed into a plurality of galleries while passing through the central branching hole, and heat exchange is quickly performed in the central surface-corresponding hole along the surface of the mold in a wide area as possible. The secondary dispersed flow may be merged into one in the central lamination hole part and discharged through the central second main hole part.

In addition, for example, the left channel portion may include a left first main hole portion, a left branch hole portion, a left surface corresponding hole portion, a left lamination hole portion and a left second main hole portion formed in the left body.

Here, the left branch hole portion may be separated from the left first main hole portion to be connected to the left end portion and the right end portion of the left surface corresponding hole portion, respectively.

That is, the refrigerant may be distributed and supplied so that the refrigerant may be uniformly supplied over the entire area of the left surface corresponding hole portion.

Accordingly, the refrigerant is introduced into the left first main hole and is first dispersed into a plurality of galleries while passing through the left branch hole, and heat exchange is quickly performed over a wide area as possible along the surface of the mold in the left surface corresponding hole. The secondary dispersed flow may be merged into one in the left lamination hole and discharged through the left second main hole.

Also, for example, the right flow passage may include a right first main hole portion, a right branch hole portion, a right surface corresponding hole portion, a right lamination hole portion and a right second main hole portion formed in the right body.

Here, the right branch hole portion may be separated from the right first main hole portion to be connected to the left end portion and the right end portion of the right surface corresponding hole portion, respectively.

That is, the refrigerant may be distributed and supplied so that the refrigerant may be uniformly supplied over the entire area of the right surface corresponding hole portion.

Therefore, the refrigerant is introduced into the right first main hole and is first dispersed into a plurality of galleries while passing through the right branching hole, and heat exchange is quickly performed in the right surface-corresponding hole along the surface of the mold in a wide area as possible. The secondary dispersed flow may be merged into one in the right lamination hole portion and discharged through the right second main hole portion.

However, the flow form of the refrigerant may be very diverse, such as the inflow or discharge direction of the refrigerant being alternated with each other in the forward direction and the reverse direction, or the inflow or discharge of the refrigerant is mixed and simultaneously performed in both directions.

On the other hand, as shown in FIG. 9 , the refrigerant passage part 20 is formed in the surface-corresponding hole part 23 and collides with the refrigerant to evenly distribute the flow of the refrigerant. At least one distribution protrusion (T) ) may be further included.

More specifically, for example, as shown in FIG. 9 , the distribution protrusion T may be formed in a cylindrical shape to connect one inner wall and the other inner wall of the surface-corresponding hole 23 to each other.

However, the distribution protrusion T is not necessarily limited thereto. For example, it is formed in a polygonal shape, a round protrusion shape, or is formed to be misaligned with one inner wall and the other inner wall, etc., so that the refrigerant can form a turbulent flow. can be formed in the form.

In addition, for example, as shown in FIG. 9 , the distribution protrusions T are dispersedly arranged in M rows and N columns to be spaced apart from each other, and columns and columns or rows and rows are displaced from each other so that the refrigerant can form turbulence. can be

However, the arrangement of the distribution protrusions T is not necessarily limited thereto, and for example, a zigzag arrangement or arrangement for forming a turbulence, such as a lattice arrangement, may all be applied.

Accordingly, the refrigerant collides with the distribution protrusions (T) while passing between the distribution protrusions (T) and other neighboring distribution protrusions (T) in a zigzag while passing through the surface-widened portion (23), and heat exchange efficiency This high turbulence is formed, and the cooling rate can be further improved due to this turbulence.

The shape of the refrigerant passage part 20 of the present invention may be very complex in three dimensions, and in order to form such a complex structure, the core mold body 10 and the refrigerant passage part 20 are 3D printed It may be a multi-layer structure formed by using a metal material, a synthetic resin material, or the like in multi-layers.

Therefore, according to the present invention, refrigerant passages such as branching holes branching from the main hole and corresponding holes that are widened along the surface of the mold are formed with a 3D printer to uniformly cool the entire surface area of the mold corresponding to the molten metal. The cooling rate can be greatly improved to refine the structure, the strength and durability of the piston can be greatly improved, and the productivity can be greatly improved by increasing the cooling rate.

Although the present invention has been described with reference to the embodiment shown in the drawings, which is only exemplary, those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

10: core mold body
10-1, 10-4: center body
10-2: front body
10-3: rear body
10-5: left body
10-6: right body
20: refrigerant passage part
20-1, 20-4: central flow path part
20-2: front flow path part
20-3: rear flow path part
21: first main hole part
21-1, 21-4: center first main hole part
21-2: front first main hole part
21-3: rear first main hole part
22: branch hole
22-1, 22-4: central branch hole
22-2: front branch hole
22-3: rear branch hole
23: surface corresponding hole part
23-1, 23-4: center surface corresponding hole part
23-2: front surface corresponding hole part
23-3: rear surface corresponding hole part
24: paper hole part
24-1, 24-4: central lamination hole part
24-2: front lamination hole part
24-3: rear lamination hole part
25: second main hole part
25-1, 25-4: center second main hole part
25-2: front second main hole part
25-3: Chapter 2 main hole part
R: sliding rail
T: distribution protrusion
100, 200: piston core mold device

Claims (16)

a core mold body forming at least a portion of the cavity; and
and a refrigerant passage formed inside the core mold body to cool the molten metal introduced into the cavity.
The refrigerant passage part,
a first main hole through which refrigerant is introduced or discharged;
a branch hole portion branching in at least one direction from the first main hole portion;
One end is connected to the branch hole so that the coolant can flow widely along the surface of the core mold body, and the surface-corresponding hole part is formed along the shape of the surface of the core mold body or is formed in a shape that is widened to a large area ;
a lamination hole portion connected to the other end of the surface-corresponding hole portion and laminated in at least one direction; and
A second main hole part connected to the lamination hole part through which the refrigerant is discharged or introduced;
The core mold body,
central body;
a front body positioned in front of the central body to facilitate removal of the mold, and detachably installed with the central body; and
a rear body positioned at the rear of the central body to facilitate removal of the mold, and detachably installed with the central body; including,
The refrigerant passage part,
a central flow path formed in the central body;
a front flow path formed in the front body; and
a rear flow path formed in the rear body;
A piston core mold device comprising a. delete delete The method of claim 1,
The central flow path portion, a center first main hole portion, a center branch hole portion, a center surface-corresponding hole portion, a center lamination hole portion and a center second main hole portion formed in the center body, the piston core mold device comprising a. The method of claim 1,
The front flow passage, a piston core mold device comprising a front first main hole portion, a front branch hole portion, a front surface corresponding hole portion, a front lamination hole portion and a front second main hole portion formed in the interior of the front body. The method of claim 1,
The rear flow path portion, a rear first main hole portion, a rear branch hole portion, a rear surface corresponding hole portion, a rear lamination hole portion and a rear second main hole portion formed in the rear body, the piston core mold device comprising a. a core mold body forming at least a portion of the cavity; and
and a refrigerant passage formed inside the core mold body to cool the molten metal introduced into the cavity.
The refrigerant passage part,
a first main hole through which refrigerant is introduced or discharged;
a branch hole portion branching in at least one direction from the first main hole portion;
One end is connected to the branch hole so that the coolant can flow widely along the surface of the core mold body, and the surface-corresponding hole part is formed along the shape of the surface of the core mold body or is formed in a shape that is widened to a large area ;
a lamination hole portion connected to the other end of the surface-corresponding hole portion and laminated in at least one direction; and
A second main hole part connected to the lamination hole part through which the refrigerant is discharged or introduced;
The core mold body,
central body;
a left body located on the left side of the central body to facilitate removal of the mold, and detachably installed with the central body; and
and a right body located on the right side of the central body to facilitate removal of the mold, and detachably installed with the central body;
The refrigerant passage part,
a central flow path formed in the central body;
a left flow path formed in the left body; and
a right flow path formed in the right body;
A piston core mold device comprising a. delete 8. The method of claim 7,
The central flow path portion, a center first main hole portion, a center branch hole portion, a center surface-corresponding hole portion, a center lamination hole portion and a center second main hole portion formed in the center body, the piston core mold device comprising a. 8. The method of claim 7,
The left flow path portion, the piston core mold device comprising a left first main hole portion, a left branch hole portion, a left surface corresponding hole portion, a left lamination hole portion and a left second main hole portion formed in the interior of the left body. 8. The method of claim 7,
The right channel portion, the piston core mold device comprising a right first main hole portion, a right branch hole portion, a right surface corresponding hole portion, a right lamination hole portion and a right second main hole portion formed in the inside of the right body. 8. The method of claim 7,
A piston core mold device, wherein a sliding rail is formed in the longitudinal direction on the central body or the left body and the right body to facilitate the sliding separation of the central body. The method of claim 1,
The refrigerant passage part,
at least one distribution protrusion formed in the surface-corresponding hole and collided with the refrigerant to evenly distribute the flow of the refrigerant;
Further comprising, a piston core mold device. 14. The method of claim 13,
The distribution protrusion is formed in a cylindrical shape to connect one inner wall and the other inner wall of the surface-corresponding hole to each other, the piston core mold device. 14. The method of claim 13,
The distribution protrusions are dispersedly arranged in M rows and N columns to be spaced apart from each other, and rows and columns or rows and rows are displaced from each other so that the refrigerant can form turbulence. The method of claim 1,
The core mold body and the refrigerant passage portion is a multi-layer structure formed in multi-layer using a 3D printer, a piston core mold device.

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