KR102634788B1 - Casting for mold, mold, manufacturing method of casting for mold and manufacturing method of mold - Google Patents

Abstract

The present invention relates to a mold having a shape-adaptive cooling channel therein, and a method of manufacturing such a mold.
The mold according to the present invention includes a body, a cooling channel formed inside the body, and one or more auxiliary channels that communicate with the cooling channel and are connected to at least one surface of the body, and at least one of the auxiliary channels is It is characterized by being formed in an arch shape.

Description

Casting for mold, mold, manufacturing method of casting for mold, and manufacturing method of mold {Casting for mold, mold, manufacturing method of casting for mold and manufacturing method of mold}

The present invention relates to a mold casting having a shape-adaptive cooling channel therein, a mold manufactured using the same, and a method of manufacturing the mold casting and mold.

Conventional molds are processed into molds using squares made of forged steel (for example, cubes, rectangular parallelepipeds, or similar shapes), and when processing cooling channels to cool the mold, processing using a gun drill, etc. is usually used. do.

However, molds with cooling channels processed through gun drilling have limitations in the shape of the cooling channels, so the effect of cooling the molded body in the mold is often reduced.

In particular, in plastic injection molding, the cooling process takes up about 60% of the total injection process time, so it is the process variable that has the greatest impact on the productivity of the injection process. In order to shorten the cooling process during plastic injection molding, it is important to increase the cooling rate of the part where cooling occurs the slowest.

However, since cooling channels made through machining, such as gun drills, are formed only in straight lines, they cannot be processed into so-called 'conformal cooling channels' in which cooling channels are formed according to the shape of the cavity.

On the other hand, in order to process a shape-adaptive cooling channel, a brazing method is used to process a curved shape-adaptive cooling channel by dividing a conventional sheet material, machining it, and then joining them, or a shape-adaptive cooling method using lamination. The use of methods such as metal 3D printing, which directly creates a mold with channels inside, has been proposed.

However, the brazing method has a problem in that many defects occur at joints, and the metal 3D printing method has extremely limited application areas because 3D printing materials with the physical properties required for the mold have not been developed or are too expensive.

Public Patent Publication No. 2019-0109611

The problem to be solved by the present invention is to provide a mold having a shape-adaptive cooling channel that can solve the problems of the prior art described above, and a method of manufacturing such a mold at low cost.

The first aspect of the present invention for solving the above problem includes a body, a cooling channel formed inside the body, and one or more auxiliary channels that communicate with the cooling channel and are connected to at least one side of the body, At least one of the auxiliary channels provides a casting for a mold in an arch shape.

The casting for a mold according to the present invention has a cooling channel and an auxiliary channel, and the auxiliary channel is also filled with cooling water, so that heat distribution throughout the mold can be evened, reducing molding defects and increasing mold life. In particular, the arch-shaped auxiliary channel ensures the durability of the mold by forming the gap between the cooling channel and the auxiliary channel or between the auxiliary channels and the auxiliary channels at a certain distance through the arch shape, and at the same time, it can further reduce the thermal deviation within the mold. The efficiency of the mold can be further increased.

In the first aspect, the cooling channel communicating with the auxiliary channel may be of a shape-adaptive type.

The cooling channel formed inside the casting for a mold according to the present invention is formed in a shape-adaptive type along the molding surface formed in the mold, so that the molding time by the mold can be significantly shortened.

In the first aspect, the auxiliary channel may be shaped to include a pillar part extending from one side of the body, and a curved connection part connected from the pillar part to communicate with the cooling channel.

The arch-shaped auxiliary channel including the pillar portion and the connection portion increases the support strength of the cooling channel and allows the channels to be spaced apart from each other by a certain amount or more.

In a first aspect, at least a portion of the cooling channel or the auxiliary channel may have an oval cross-section, and the angle at which the long axis of the oval shape intersects the bottom of the mold may be 45° or more.

In the first aspect, the angle at which the long axis direction of the oval shape intersects the bottom surface of the mold may be 60° or more.

In the first aspect, at least a portion of the cooling channel may have spiral-shaped irregularities formed on the inner surface.

In the first aspect, the cross section of the cooling channel in which the spiral-shaped irregularities are formed may have a shape in which convex portions and concave portions are intersecting and connected.

The spiral-shaped irregularities formed on the inner surface of the cooling channel expand the surface area of the cooling channel, enabling excellent cooling efficiency even with a small diameter. In addition, the spiral-shaped irregularities allow the injected coolant to form a vortex, thereby suppressing the formation of limestone in a portion of the cooling channel where the flow of coolant stagnates, thereby preventing clogging of the cooling channel.

A second aspect of the present invention to solve the above problem is to provide a mold in which a molding surface for molding an object is formed by machining on at least one side of the casting for the mold.

In a second aspect, one end of the auxiliary channel is formed on a surface other than the molding surface, and the hole formed by the one end can be sealed through a sealing member.

In a second aspect, the mold can be suitably used for plastic injection, but is not limited to this and can also be used for molds for various purposes.

The third aspect of the present invention to solve the above problem includes manufacturing a core for forming a cooling channel by 3D printing, installing the core for forming a cooling channel in a mold, and injecting molten metal into the mold. A step of solidifying and removing the mold and a core for forming a cooling channel from the solidified casting, wherein the core includes a structure for forming a cooling channel and one or more supports supporting the structure for forming a cooling channel; , to provide a method of manufacturing a casting for a mold in which at least one of the supports has an arch shape.

In the manufacturing method of the mold casting, a support formed in an arch shape is used to secure the support force for supporting the cooling channel, and at the same time, the distance between the complex cooling channel and the auxiliary channel or between the auxiliary channels is set to be more than a certain distance, It facilitates the flow of molten metal during pouring and prevents the cooling channel from being damaged during the pouring process, thereby preventing manufacturing defects in castings. In addition, the auxiliary channel formed in the casting by the arch-shaped support can secure the durability of the above-described mold and at the same time reduce heat variation within the mold, further increasing mold efficiency.

In a third aspect, the core for forming the cooling channel further includes a base, and one end of the support may be fixed to the base.

By using such a base, a more robust core for forming a cooling channel can be formed.

In a third aspect, the arch shape may include a pillar part extending from the base, and a connection part curvedly connected from the pillar part to the structure for forming the cooling channel.

In a third aspect, the mold includes an upper mold and a lower mold, and the base can be inserted into the upper mold.

In a third aspect, the mold includes an upper mold and a lower mold that are separate from each other, and the base of the core for forming the cooling channel may be formed integrally with the upper mold of the mold.

When the base is joined to the upper part of the mold or the base itself is formed to be the upper part of the mold, a large amount of gas generated from the base during the casting process can be discharged directly to the outside through the base without passing through the molten metal. Casting defects caused by gas generated by decomposition of the binder contained in can be greatly reduced.

In a third aspect, at least some of the structures or supports for forming the cooling channel may have an oval cross-section, and the angle at which the long axis direction of the oval cross-section intersects the bottom of the mold may be 45° or more.

In a third aspect, spiral-shaped irregularities may be formed on the surface of a portion of the structure for forming the cooling channel.

In a third aspect, the spiral-shaped irregularities may have a cross-sectional shape in which convex portions and concave portions intersect and connect.

This spiral shape can more easily form vortices in the coolant supplied to the cooling channel and prevent limescale from being formed by the coolant.

The fifth aspect of the present invention for solving the above problems is to provide a method of manufacturing a mold that forms a molding surface for molding an object by machining the mold casting according to the first aspect.

According to this method, a mold with a shape-adaptive cooling channel formed therein can be manufactured at low cost.

According to the present invention, a mold having a shape-adaptive cooling channel can be manufactured economically.

In addition, the mold manufactured according to the present invention is equipped with a cooling channel and an auxiliary channel in communication with the cooling channel, and the auxiliary channel is also filled with cooling water, so that heat distribution throughout the mold is evened, reducing molding defects and increasing mold life. You can.

In addition, the mold according to the present invention is provided with an arch-shaped auxiliary channel. Through the arch-shaped structure, the gap between the cooling channel and the auxiliary channel or between the auxiliary channels is maintained to be more than a predetermined distance, thereby maintaining the mold. In addition to ensuring durability, thermal deviation within the mold can be reduced, further increasing mold efficiency.

In addition, the mold according to one embodiment of the present invention has spiral irregularities formed on the inner surface of the cooling channel, forming a larger surface area compared to the cooling channel formed through existing drilling, enabling excellent cooling efficiency even with a small diameter. there is. In addition, the coolant injected by the spiral concave-convex surface forms a vortex, thereby suppressing the formation of lime contained in the coolant, thereby reducing clogging of the cooling channel.

Since the mold manufacturing method according to the present invention implements a shape-adaptive cooling channel through a casting method, there are fewer defects compared to the conventional brazing method and there is an advantage in that the mold can be made at a lower cost than the metal 3D printing method. In addition, since there are many different types of alloys that can be used compared to metal 3D printing methods, it is easy to respond to the various physical properties required depending on the type of mold.

In the mold manufacturing method according to an embodiment of the present invention, the structure for forming the cooling channel is formed to have an oval cross-section, and the angle where the long axis direction of the oval intersects the bottom of the mold is 45° or more, and molten metal is injected. By reducing the resistance of the molten metal when applied, damage to the structure for forming the cooling channel is prevented during the molten metal injection process. In particular, there is an advantage in preventing damage to the cooling channel forming structure while securing the volume of coolant per unit area by forming it with an oval cross-section in areas where there is not enough space to form the cooling channel forming structure.

According to the mold manufacturing method according to one embodiment of the present invention, it is possible to efficiently manufacture a cooling passage having a spiral concavo-convex surface, which could not be realized using conventional machining methods.

1 is a manufacturing process diagram of a mold according to a first embodiment of the present invention.
Figure 2 schematically shows the mold manufacturing and casting processes in the mold manufacturing process according to the first embodiment of the present invention.
Figure 3 is a perspective view of a core coupled to an upper mold constituting a mold in the mold manufacturing process according to the first embodiment of the present invention.
Figure 4 is a partial enlarged view of the center portion of Figure 3.
Figure 5 is a cross-sectional view of a casting for a mold manufactured according to the first embodiment of the present invention.
Figure 6 is a cross-sectional view of a mold manufactured according to the first embodiment of the present invention.
Figure 7 is a schematic diagram showing the relationship between a mold and a portion having an oval cross-section among the core for manufacturing a mold according to the second embodiment of the present invention.
Figure 8 is a perspective view of a core for forming a cooling channel according to a third embodiment of the present invention.
Figure 9 is a cross-sectional view of a mold manufactured according to a third embodiment of the present invention.

Hereinafter, with reference to the attached drawings, embodiments of the present application will be described in detail so that those skilled in the art can easily implement them. However, the present application may be implemented in various different forms and is not limited to the embodiments described herein.

In order to clearly explain the present application in the drawings, parts that are not related to the description are omitted, and similar reference numerals are assigned to similar parts throughout the specification.

Throughout the specification of the present application, when a part "includes" a certain component, this means that it may further include other components rather than excluding other components unless specifically stated to the contrary.

[First Embodiment]

1 is a manufacturing process diagram of a mold according to a first embodiment of the present invention.

As shown in Figure 1, the manufacturing process of the mold according to the first embodiment of the present invention includes the steps of manufacturing a core for forming a cooling channel with a 3D printer, manufacturing a mold, and installing the manufactured core in the mold. It includes the steps of injecting molten metal into the mold to solidify it, separating the solidified casting, and machining the separated casting to form a machined surface of the mold.

mold making

In the above process, the step of manufacturing the core for forming a cooling channel with a 3D printer and the step of manufacturing the mold are performed in parallel, or the core is manufactured first and then the mold is manufactured, or conversely, the mold is manufactured first and then the core is manufactured. It can be done in the order in which it is produced.

Figure 2 schematically shows the manufacturing and casting process of the mold 100 in the mold manufacturing process according to the first embodiment of the present invention.

As shown in Figure 2, first, an upper mold 110 and a lower mold 120 having a predetermined shape are manufactured using a mold manufacturing method generally used in sand casting.

Even if the upper mold 110 and the lower mold 120 are not divided into two structures, the process according to the present invention can be performed as long as the core for forming a cooling channel can be inserted, so they can be manufactured in three or more separate shapes. It may be possible. When manufacturing an upper mold and a lower mold in several separate shapes, the mold placed on the upper side of the core is called the upper mold, and the mold placed on the lower side of the core is called the lower mold.

This is because it is economical to use a mold manufacturing method for the upper mold 110 and lower mold 120 in a general sand casting method, and it does not exclude manufacturing the upper mold 110 and lower mold 120 through a 3D printer.

Next, the core 130 to form a shape-adaptive cooling channel is molded using a 3D printer. The cooling channel core 130 is formed using a 3D printer because it is difficult to manufacture a complex three-dimensional shape using a general mold manufacturing method.

The core 130 for the cooling channel can be manufactured through various 3D printing methods. For example, it can be produced by 3D printing using silica sand with an average particle size of about _140㎛ and furan resin, a binder. The 3D printing method used to manufacture the core 130 for the cooling channel may use a variety of methods. For example, a binder such as furan resin is sprayed on a bed made of silica sand according to set 2D spray data. A three-dimensional shape can be realized by layering. In addition, a method of sintering resin-coated sand with a laser without spraying a binder can be used, or a three-dimensional shape can be realized by using an inorganic binder rather than an organic binder.

Figure 3 is a perspective view of the core for the cooling channel coupled to the upper mold constituting the mold.

As shown in FIG. 3, the cooling channel core 130 includes a cooling channel forming structure 131, a support 132 for supporting the cooling channel forming structure 131, and the support 132. It includes a base 133 for forming and fixing the core 130 to the mold 100.

As shown in FIG. 4, a portion of the support 132 includes a column portion 132a extending in the longitudinal direction, and a connection portion curvedly connected toward the cooling channel near the end of the column portion 132a. It may be formed into an arch shape including (132b).

In the present invention, the 'arch shape' includes a shape having an arc-shaped portion, and the pillar portion may be formed of one, two, or three or more column portions. In addition, in the embodiment of the present invention, the connection portion 132b connected to the cooling channel forming structure 131 is formed as one, but of course, it can optionally be formed as two or more.

Additionally, the cross-sectional shape of the pillar portion 132a and the connecting portion 132b may be formed in various shapes such as a circle, an oval, a triangle, a square, or a polygon such as a pentagon.

The arch-shaped support 132 allows the cooling channel forming structure 131 to be properly supported even if it has a complicated cooling channel shape, and at the same time, the cooling channel forming structure 131 and the support 132 The spacing between the supports 132 or the spacing between the supports 132 can be properly maintained. Accordingly, the durability of the manufactured mold is maintained and at the same time, the thermal deviation within the mold can be made more uniform, thereby further increasing the molding efficiency.

In addition, a flat flat portion 132c may be formed at the inner end of the pillar portion 132a, as shown in FIG. 4. This flat portion 132c forms a horizontal portion inside the casting for the mold. , It can be used as a reference point to measure the machining position and depth during machining of a cast mold, and can be used as a reference structure for precise subsequent machining.

Additionally, a button-shaped end portion 132d having a much larger diameter than the diameter of the pillar portion 132a is formed at the outer end of the pillar portion 132a. This button-shaped end forms a different diameter from the pillar on the surface of the mold casting, and can be used as a standard for matching the machining depth and horizontality when machining on the surface, so it is a reference structure for precise subsequent machining. It can be used as.

The base 133 of the cooling channel core 120 manufactured as described above is inserted into the insertion portion 111 formed in the upper mold 110 to be coupled to the upper mold 110. In the first embodiment of the present invention, the mold was manufactured in a shape in which the cooling channel core 130 was inserted into the upper mold 110, but the upper mold 110 or lower mold 120 and the cooling channel core 130 were manufactured. The mold 100 can also be manufactured by integrally molding it and then assembling it into an opposing mold (upper mold or lower mold).

In the mold manufacturing method according to the first embodiment of the present invention, the base 133 of the core 130 for forming a cooling channel is coupled to the upper mold 110, so that a large amount of gas generated from the base during the casting process passes through the molten metal. Since it is designed to be discharged to the outside directly through the base without having to do so, casting defects due to gas generated by decomposition of the binder contained in the core 130 can be greatly reduced. In addition, although not shown, an exhaust hole may be formed in the base 133 through which air and generated gas within the mold can be discharged.

Manufacturing castings for molds

As shown in FIG. 2, molten alloy is poured into the mold 100 completed through the above process. Various alloys that can be used in molds can be used as the molten alloy, but preferably, the physical properties required for the mold (e.g., strength, elongation, impact resistance, corrosion resistance, etc.) are used in the cast state or when heat treatment is performed after casting. ) Select and use an alloy that can be implemented.

After the molten alloy is solidified, the upper mold 110 and the lower mold 120, including the cooling channel core 130, are removed, and a mold casting 10 having a cross-sectional structure as shown in FIG. 5 is created.

As shown in Figure 5, inside the mold casting 10, a shape-adaptive cooling channel 11 and an auxiliary channel 12 are formed in communication with this and one end of which is connected to one surface of the mold casting 10. .

In the present invention, 'auxiliary channel' refers to a channel formed in the support 132.

The auxiliary channel 12 is formed by transferring the shape of the support 132 to form a pillar portion 12a and a connection portion 12b extending from the pillar portion 12a. A flat area 12aa is formed in the pillar portion 12a to allow the position of the inner end of the pillar portion to be measured from the surface of the body.

In addition, a button-shaped end 12ab having a much larger diameter than the diameter of the pillar 12a is formed at the outer end of the pillar 12a (the part exposed to the surface of the body to form a hole). .

Meanwhile, although not shown, if a flat area is formed inside the cooling channel at the area where the cooling channel is connected to the auxiliary channel, which is straight rather than arched, the distance from the hole of the auxiliary channel exposed to the outside to the cooling channel is Since it can be measured accurately, if the flat area 12aa is not sufficient in the pillar portion 12a, a flat area that can be used as an internal reference point can be formed at the area where the auxiliary channel and the cooling channel are connected.

Machining of castings for molds

Since the surface of such a casting is rough, it is difficult to use it as a mold as is, so a mold is manufactured by performing a process of machining the fastening surface for fastening the mold and the molding surface (i.e., cavity) of the mold.

As described above, a plurality of holes formed by the cooling channel 11 and the auxiliary channel 120 are formed on the surface of the mold casting 10.

And, at the end of the hole, a button-shaped end 12ab having a larger diameter than the diameter of the cooling channel 11 and the auxiliary channel 12 is formed to a predetermined depth (several mm to hundreds of mm), so that there is no step in the diameter. The point can be used as a reference point for surface processing. For example, surface machining (roughing or finishing machining) can be performed up to the point where there is a difference in diameter. Accordingly, the button-shaped end portion 12ab can be used as an external reference point for machining.

In the first embodiment of the present invention, button-shaped end portions 12ab with different diameters are formed, but the cross-sectional shape can be formed differently, such as triangle, square, or oval, so that the operator can easily recognize the processing depth. there is.

In addition, a flat area (12aa) is formed inside the hole, so that the distance from the surface of the mold casting to the flat area (12aa) can be accurately measured. The flat area 12aa can be used as an internal reference point for machining.

For example, the external and internal reference points above are used to check the position and level based on the external reference point and then perform cutting. If the external reference point is not sufficient to check the position and level or more precise processing is required, the internal reference point is used. It can be used as a way to check. Of course, machining can also be performed using external and internal reference points simultaneously. This processing standard structure makes it possible to perform precise post-processing in a short time without damaging the cooling channels embedded inside.

After machining is completed, the mold manufacturing is completed by blocking the holes of the auxiliary channels 13 exposed on the surface of the mold body, which are not used for coolant injection, using a blocking member.

Figure 6 is a cross-sectional view of a mold manufactured according to the first embodiment of the present invention.

As shown in FIG. 6, the mold manufactured according to the first embodiment of the present invention has a molding surface 13 (a surface on which molding is performed in the mold) formed through the machining process on one surface. In addition, a shape-adaptive cooling channel 11 is formed inside the mold, and a number of auxiliary channels 12 whose ends communicate with the cooling channel 11 are formed.

The auxiliary channel 12 is exposed on a side of the body other than the molding surface 13, and the exposed hole of the auxiliary channel 12 is sealed with a blocking member 14, so that the coolant injected into the cooling channel 11 is prevented from leaking through the auxiliary channel (12).

[Second Embodiment]

The manufacturing method of the mold according to the second embodiment of the present invention is substantially the same in all processes as the first embodiment. However, the cross-sectional shape of at least a portion of the cooling channel forming structure 131 constituting the cooling channel core 130 or the support 132 for supporting the cooling channel forming structure 131 is oval, The characteristic feature is that the angle of the oval is in a specific shape.

Figure 7 is a schematic diagram showing the relationship between a mold and a portion having an oval cross-section among the cooling channels or supports constituting the core in the mold manufacturing method according to the second embodiment of the present invention.

As shown in FIG. 7, the cross-section of the cooling channel forming structure 131 of the cooling channel core 130 is oval-shaped, and the long axis direction of the oval is formed by the bottom surface of the mold (bottom surface of the lower mold). It is formed so that the angle θ is 45° or more (preferably 60° or more, more preferably 70° or more, and most preferably 80° or more).

As in the second embodiment of the present invention, when the cross-section of the cooling channel forming structure 131 is made of an ellipse and the angle (θ) formed between the long axis direction of the ellipse and the bottom surface of the mold is 45° or more, When molten metal is injected, the resistance to the flow of molten metal rising from the bottom of the mold can be reduced, and the structure for forming the cooling channel 131 is thin, preventing it from being damaged by the resistance of the molten metal during the filling process. there is.

[Third Embodiment]

The manufacturing method of the mold according to the third embodiment of the present invention is substantially the same in all processes as the first embodiment. However, it is unique in that a spiral concavo-convex portion is formed on at least a portion of the surface of the cooling channel forming structure constituting the cooling channel core.

Figure 8 is a perspective view of a core for forming a cooling channel according to a third embodiment of the present invention.

As shown in FIG. 8, a spiral concavo-convex portion 131a is formed on a portion of the cooling channel forming structure 131. The spiral concave-convex portion 131a is formed of a threaded portion 131aa and a threaded concave portion 131ab, and its cross section has a shape in which the threaded portion 131aa and the threaded concave portion 131ab are intersecting and connected.

It is preferable that the spiral concavo-convex portion 131a is formed in a portion that requires strong cooling or a portion where the diameter of the cooling channel cannot be increased compared to other portions. The surface shape of this core is transferred through the casting process, and as shown in Figure 9, when the cross section of the mold 10 manufactured after casting intersects the convex portion and the concave portion, a cooling channel 12 is formed in a spiral shape. forms.

The cooling channel in which the spiral concavo-convex portion is formed according to the third embodiment of the present invention has an increased cooling area compared to the conventional cooling channel with a smooth surface (cooling channel formed during machining), providing a better cooling effect even with the same diameter. You can get it. In particular, the cooling channel formed in a spiral shape can increase the speed of the cooling water and prevent the cooling channel from clogging due to lime growing in the area where the fluid stagnates in the cooling channel by forming a vortex.

10: Casting for mold
10': mold
11: Cooling channel
12: Auxiliary channel
13: Molded surface (cavity)
14: Blocking member
100: mold
110: Hieroglyph
120: lower type
130: middle character
131: Structure for forming cooling channels
132: Support
133: base

Claims (18)

body,
a cooling channel formed inside the body,
Comprising one or more auxiliary channels connected to the surface of the body while communicating with the cooling channel,
A portion of the one or more auxiliary channels is formed in an arch shape,
A mold casting in which the part of the auxiliary channel connected to the surface of the body is sealed with a blocking member to prevent the inflow or outflow of coolant. According to claim 1,
A mold casting in which the cooling channel communicating with the auxiliary channel is of a shape-adaptive type. According to claim 1,
The auxiliary channel includes a pillar portion extending from one side of the body,
A casting for a mold having a shape including a connection part curvedly connected from the pillar part to communicate with the cooling channel. According to claim 1,
At least a portion of the cooling channel or auxiliary channel has an oval cross-section,
A casting for a mold in which the angle where the major axis of the oval shape intersects the bottom of the mold is 45° or more. According to claim 4,
A casting for a mold in which the angle at which the long axis of the oval shape intersects the bottom of the mold is 60° or more. According to claim 1,
A casting for a mold in which at least a portion of the cooling channel has spiral irregularities formed on its inner surface. According to claim 6,
The cross section of the cooling passage in which the spiral irregularities are formed is a mold casting in which convex portions and concave portions are intersecting and connected. A mold having the structure of the mold casting according to any one of claims 1 to 7, and having a molding surface for molding an object on at least one side formed by machining. According to claim 8,
A mold where the portion of the auxiliary channel connected to the surface of the body is formed in a portion other than the molding surface. According to claim 8,
The mold is a mold for plastic injection. Manufacturing a core for forming a cooling channel by 3D printing,
Installing the core for forming the cooling channel in the mold;
Injecting molten metal into the mold and solidifying it;
Comprising the step of removing the mold and the core for forming the cooling channel from the solidified casting,
The core includes a structure for forming a cooling channel and one or more supports supporting the structure for forming a cooling channel, and at least one of the supports has an arch shape,
The casting from which the core is removed includes a body, a cooling channel formed inside the body, and one or more auxiliary channels that communicate with the cooling channel and are connected to the surface of the body,
A portion of the at least one auxiliary channel is formed in an arch shape, and a portion of the auxiliary channel connected to the surface of the body is sealed with a blocking member to prevent the inflow or outflow of coolant. According to claim 11,
The core for forming the cooling channel further includes a base,
A method of manufacturing a casting for a mold in which one end of the support is fixed to the base. According to claim 12,
The arch shape includes a pillar portion extending from the base,
A method of manufacturing a casting for a mold having a shape including a connecting portion curvedly connected from the pillar portion to the structure for forming the cooling channel. According to claim 12,
The mold has an upper mold and a lower mold,
A method of manufacturing a casting for a mold in which the base is inserted into the upper mold. According to claim 11,
At least a portion of the structure or support for forming the cooling channel has an oval cross-section, and the angle at which the long axis direction of the oval cross-section intersects the bottom of the mold is 45° or more. According to claim 11,
A method of manufacturing a casting for a mold in which spiral-shaped irregularities are formed on the surface of a portion of the structure for forming the cooling channel. According to claim 16,
A method of manufacturing a casting for a mold in which the spiral-shaped irregularities have a cross-sectional shape in which convex portions and concave portions are intersecting and connected. A method of manufacturing a mold, which includes machining the casting for a mold according to any one of claims 1 to 7 to form a molding surface for molding an object.