WO2022215819A1

WO2022215819A1 - Casting for mold, mold, method for manufacturing casting for mold, and method for manufacturing mold

Info

Publication number: WO2022215819A1
Application number: PCT/KR2021/015723
Authority: WO
Inventors: 박성수; 박경수; 김용래; 강래철; 김준헌
Original assignee: (주)영신특수강
Priority date: 2021-04-07
Filing date: 2021-11-02
Publication date: 2022-10-13
Also published as: KR20220139809A; KR20220139808A; WO2022215820A1; KR102634789B1; KR102634788B1

Abstract

The present invention relates to a mold having a conformal cooling channel therein, and a method for manufacturing the mold. The mold according to the present invention includes a body, a cooling channel formed inside the body, and one or more auxiliary channels communicating with the cooling channel and connected to at least one surface of the body, wherein at least one of the auxiliary channels is formed in an arch shape.

Description

Mold casting, mold, manufacturing method of mold casting and mold manufacturing method

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

A conventional mold is processed into a mold using a square material (for example, a cube, a cuboid or a similar shape) made of forged steel, and in processing a cooling channel for cooling the mold, processing using a gun drill is used do.

However, the mold in which the cooling channel is processed through the gun drilling process has a limitation in the shape of the cooling channel, so the effect of cooling the molded body in the mold is often reduced.

In particular, in plastic injection molding, since the cooling process occupies about 60% of the total injection process time, it is a process variable that has the greatest influence on the productivity of the injection process. In order to shorten the cooling process in such plastic injection molding, it is important to increase the cooling rate of the part where cooling occurs last.

However, since the cooling channel made by machining such as a gun drill is formed only in a straight line, it cannot be processed into a so-called 'conformal cooling channel' in which the cooling channel is formed according to the shape of the cavity.

On the other hand, in order to process the shape adaptive cooling channel, the conventional plate material is divided and machined, and then the curved shape adaptive cooling channel is processed through a method of joining them, the brazing method, or the shape adaptive cooling through lamination. The use of a method such as a metal 3D printing method for directly making a mold having a channel inside has been proposed.

However, the brazing method causes a lot of defects in the bonding area, and the metal 3D printing method has a problem in that the material for 3D printing having the properties required for the mold is not developed or is too expensive, so the application field is extremely limited.

An object of the present invention is to provide a mold having a shape-adaptive cooling channel capable of solving the problems of the prior art, and a method for manufacturing such a mold at low cost.

A first aspect of the present invention for solving the above problems includes a body, a cooling channel formed inside the body, and one or more auxiliary channels communicating with the cooling channel and connected to at least one surface of the body, At least one of the auxiliary channels is to provide a casting for a mold made of an arch shape.

The casting for a mold according to the present invention has a cooling channel and an auxiliary channel, and since the cooling water is also filled in the auxiliary channel, it is possible to reduce the molding defect and increase the mold life by evening the heat distribution of the entire mold. In particular, the arch-shaped auxiliary channel secures the durability of the mold and further reduces the thermal deviation in the mold by forming the interval between the cooling channel and the auxiliary channel or the auxiliary channel and the auxiliary channel to be separated by a certain amount through the arch shape. 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 have a shape including a pillar portion extending from one surface of the body, and a connecting portion connected in a curved shape to communicate with the cooling channel from the pillar portion.

The arch-shaped auxiliary channel including the column part and the connecting part can be formed to separate the channel spacing by a certain level or more while increasing the support strength of the cooling channel.

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

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

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

In the first aspect, the cross section of the cooling channel in which the spiral irregularities are formed may have a shape in which a convex portion and a concave portion intersect each other.

The spiral irregularities formed on the inner surface of the cooling channel increase the surface area of the cooling channel to realize excellent cooling efficiency even with a small diameter. In addition, the spiral irregularities allow the injected cooling water to form a vortex, thereby suppressing the formation of lime in a portion of the cooling channel where the flow of the cooling water is stagnant, thereby preventing clogging of the cooling channel.

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

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

In the second aspect, the mold may be suitably used for plastic injection, but is not limited thereto, and may be used in a mold for various purposes.

A third aspect of the present invention for solving the above problems includes the steps of manufacturing a core for forming a cooling channel by 3D printing, installing the core for forming the cooling channel in a mold, and injecting molten metal into the mold, 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 at least one support for supporting the structure for forming a cooling channel, , at least one of the supports is to provide a method of manufacturing a casting for a mold made of an arch shape.

In the manufacturing method of the casting for a mold, by using an arch-shaped support, the supporting force for supporting the cooling channel is secured and at the same time, the distance between the complex cooling channel and the auxiliary channel or between the auxiliary channel and the auxiliary channel is separated by a certain level or more, It is possible to smooth the flow of the molten metal during pouring and prevent the cooling channel from being damaged during the pouring process, thereby preventing manufacturing defects of the casting. In addition, the auxiliary channel formed in the casting by the arch-shaped support secures the durability of the above-described mold, and at the same time reduces the thermal deviation in the mold, thereby further increasing the efficiency of the mold.

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

By using such a base, it is possible to form a more robust core for forming a cooling channel.

In the third aspect, the arch shape may be a shape including a pillar portion extending from the base and a connecting portion connected in a curved shape to be connected to the structure for forming the cooling channel from the pillar portion.

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

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

When the base is combined with the upper part of the mold or the base itself is formed to become the upper part of the mold, the gas generated in a large amount from the base during the casting process can be discharged directly to the outside through the base without passing through the molten metal. It is possible to greatly reduce casting defects due to gas generated by the decomposition of the binder contained in the .

In the third aspect, at least a portion of the structure or support for forming the cooling channel may have an elliptical cross-section, and an angle at which the long axis direction of the elliptical cross-section and the bottom surface of the mold intersects may be formed to be 45° or more.

In the third aspect, a helical unevenness may be formed on the surface of a portion of the structure for forming the cooling channel.

In the third aspect, the helical unevenness may have a cross-section in which a convex portion and a concave portion are connected to each other.

Such a spiral shape can more easily form a vortex of the cooling water supplied to the cooling channel, thereby preventing the formation of lime by the cooling water.

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

According to this method, a mold having 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 economically manufactured.

In addition, the mold manufactured by the present invention has a cooling channel and an auxiliary channel communicating with the cooling channel, and since the cooling water is also filled in the auxiliary channel, the heat distribution of the entire mold is even, reducing molding defects and increasing the mold life. can

In addition, the mold according to the present invention is provided with an arch-shaped auxiliary channel. Through the arch-shaped structure, the distance between the cooling channel and the auxiliary channel or between the auxiliary channel and the auxiliary channel is maintained to be more than a predetermined distance to increase the thickness of the mold. At the same time, the durability of the mold can be ensured, and the thermal deviation within the mold can be reduced, thereby further increasing the mold efficiency.

In addition, the mold according to an embodiment of the present invention has a spiral unevenness formed on the inner surface of the cooling channel to form a larger surface area compared to the cooling passage formed through conventional drilling, so that excellent cooling efficiency can be realized even with a small diameter. have. In addition, by forming a vortex of the cooling water injected by the helical uneven surface, it is possible to suppress the formation of lime contained in the cooling water, thereby reducing clogging of the cooling channel.

Since the mold manufacturing method according to the present invention implements the shape-adaptive cooling channel through the 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 low cost compared to the metal 3D printing method. In addition, since the types of alloys that can be used are diverse compared to the metal 3D printing method, it is easy to respond to various physical properties required according to the type of mold.

In the method for manufacturing a mold according to an embodiment of the present invention, the structure for forming the cooling channel is formed to have an elliptical cross-section, and the angle of intersection between the long axis direction of the ellipse and the bottom surface of the mold is 45° or more, and the molten metal is injected By reducing the resistance of the molten metal, it is prevented that the structure for forming the cooling channel is damaged in the process of pouring the molten metal. In particular, by forming an elliptical cross section in an area where the space for forming the cooling channel forming structure is insufficient, there is an advantage in that it is possible to prevent damage to the cooling channel forming structure while securing the volume of cooling water per unit area.

According to the method for manufacturing a mold according to an embodiment of the present invention, it is possible to efficiently manufacture a cooling flow path having a helical uneven surface, which cannot be realized by a conventional machining method.

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

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

3 is a perspective view of a core coupled to an upper mold constituting a mold in the manufacturing process of the mold according to the first embodiment of the present invention.

FIG. 4 is a partially enlarged view of the center of FIG. 3 .

5 is a cross-sectional view of a casting for a mold manufactured according to the first embodiment of the present invention.

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

Fig. 7 is a schematic diagram showing the relationship between a mold and a part having an elliptical cross section in a core for manufacturing a mold according to a second embodiment of the present invention;

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

9 is a cross-sectional view of a mold manufactured according to a third embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, embodiments of the present application will be described in detail so that those of ordinary skill in the art to which the present application pertains can easily carry out. However, the present application may be implemented in several different forms and is not limited to the embodiments described herein.

And in order to clearly explain the present application in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

Throughout this specification, when a part "includes" a component, it means that other components may be further included, rather than excluding other components, unless otherwise stated.

[First Embodiment]

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

mold making

In the above process, the steps of manufacturing the core for forming the cooling channel with the 3D printer and the step of manufacturing the mold are performed in parallel, or after the production of the core is first made, then the mold is manufactured, or conversely, after the mold is first manufactured, the core is made This can be done in the order in which they are manufactured.

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

As shown in FIG. 2 , first, an upper die 110 and a lower die 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 separated into two structures, if they have a shape in which a core for forming a cooling channel can be inserted, the process according to the present invention can be performed, so that three or more separate shapes can be produced. may be When the upper and lower molds are manufactured in several separate shapes, the mold disposed on the upper side of the core is called the upper mold, and the mold disposed on the lower side of the core is called the lower mold.

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

Then, the core 130 for forming the shape-adaptive cooling channel is molded using a 3D printer. Molding the core 130 for the cooling channel with a 3D printer is because it is difficult to manufacture a complex three-dimensional shape using a general mold manufacturing method.

The core 130 for the cooling channel may be manufactured through various 3D printing methods. For example, it can be manufactured by 3D printing using silica (SiO ₂ ) sand having an average particle size of about 140 μm and furan resin as a binder. Various methods may be used for the 3D printing method used for manufacturing the core 130 for the cooling channel. For example, a binder such as furan resin is sprayed on a bed made of silica sand according to the 2D spray data determined. It is possible to implement a three-dimensional shape in a stacking method. In addition, a method of sintering the resin-coated sand with a laser without spraying a binder may be used, or a three-dimensional shape may be implemented using an inorganic binder instead of an organic binder.

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

As shown in FIG. 3 , the core 130 for the cooling channel includes a structure 131 for forming a cooling channel, a support 132 for supporting the structure 131 for forming a cooling channel, and the support 132 . and 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 pillar portion 132a extending in the longitudinal direction, and a connection portion connected in a curved shape toward the cooling channel in the vicinity of an end of the pillar portion 132a. It can be formed into an arcuate shape including 132b.

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

In addition, 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 ellipse, a triangle, a polygon such as a square, and a pentagon.

The arch-shaped support 132 makes it possible to properly support the cooling channel forming structure 131 even though it has a complex cooling channel shape, and at the same time, the cooling channel forming structure 131 and the support 132 . It is possible to properly maintain the spacing between the supports or the spacing of the supports 132 . Accordingly, the durability of the manufactured mold can be maintained, and the thermal deviation within the mold can be made more uniform, so that the molding efficiency of the mold can be further increased.

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

In addition, a button-shaped end portion 132d having a much larger diameter than that of the pillar portion 132a is formed at the outer end of the pillar portion 132a. This button-shaped end forms a diameter different from that of the column on the surface of the casting for a mold, so that when processing on the surface, it can be used as a reference for aligning the processing depth and horizontality. can be used as

By inserting the base 133 of the cooling channel core 120 manufactured as described above into the insertion part 111 formed in the upper mold 110 , it is coupled to the upper mold 110 . In the first embodiment of the present invention, the mold was manufactured in the shape of inserting the cooling channel core 130 into the upper mold 110, but the upper mold 110 or the lower mold 120 and the cooling channel core 130 were used. After being integrally molded, the mold 100 may be manufactured by assembling it to an opposing mold (upper mold or lower mold).

In the manufacturing method of the mold according to the first embodiment of the present invention, by coupling the base 133 of the core 130 for forming a cooling channel to the upper die 110, the gas generated in a large amount from the base during the casting process passes through the molten metal. Since it can be discharged directly to the outside through the expectation, it is possible to greatly reduce casting defects caused by the gas generated by the decomposition of the binder included in the core 130 . In addition, although not shown, the base 133 may have a discharge hole for discharging the air and the generated gas in the mold.

Casting for molds

In the inside of the mold 100 completed through the above process, as shown in FIG. 2, the molten alloy is poured. As the alloy molten metal, various alloys that can be used in the mold may be used, but preferably, when heat treatment is performed in the cast state or after casting, the physical properties required for the mold (eg, strength, elongation, impact resistance, corrosion resistance, etc.) ), select and use an alloy that can be implemented.

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

As shown in FIG. 5 , a shape-adaptive cooling channel 11 and an auxiliary channel 12 communicating with the mold casting 10 and having one end connected to one surface of the mold casting 10 are formed in the inside of the casting 10 as shown in FIG. .

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

In the auxiliary channel 12, the shape of the support 132 is transferred to form a pillar portion 12a and a connecting portion 12b extending from the pillar portion 12a. A flat area 12aa is formed in the pillar portion 12a so that the position of the inner end of the pillar portion can be measured from the surface of the body.

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

On the other hand, although not shown, when a flat area is formed inside the cooling channel at the portion where the auxiliary channel and the cooling channel are connected, the distance from the hole of the auxiliary channel exposed to the outside to the cooling channel is measured. Since it can be accurately measured, if the flat area 12aa is not sufficient in the pillar part 12a, a flat area that can be used as an internal reference point may be formed at a portion where the auxiliary channel and the cooling channel are connected.

Machining of castings for molds

Since the surface of such a casting is rough and difficult to be used as a mold as it is, a process of machining the fastening surface for fastening the mold and the molding surface (ie, the cavity) of the mold is performed to manufacture 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 casting 10 for the mold.

And the end of the hole has 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 several hundred mm), so that the step difference in diameter This point can be used as a reference point for surface processing. For example, surface machining (roughing or finishing) can be performed to the point where there is a difference in diameter. Accordingly, the button-shaped end portion 12ab may be utilized as an external reference point for machining.

In the first embodiment of the present invention, the button-shaped end portion 12ab having a different diameter is formed, but the cross-sectional shape is formed differently such as a triangle, a square, an oval, etc., so that the operator can easily recognize the processing depth. have.

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

The external reference point and the internal reference point as described above, for example, check the position and horizontality based on the external reference point and perform cutting. It can be used as a verification method. Of course, machining can also be performed using the external and internal reference points at the same time. With this processing reference structure, it is possible to perform precise post-processing in a short time without damaging the cooling channel embedded inside.

After the machining is completed, by blocking the holes of the auxiliary channels 13 exposed on the surface of the body of the mold that are not used for injection of cooling water through the blocking member, the mold manufacturing is completed.

As shown in Fig. 6, the mold manufactured according to the first embodiment of the present invention is formed with a molding surface (surface on which molding is made in the mold) 13 formed through the above machining on one surface. In addition, a shape-adaptive cooling channel 11 is formed inside the mold, and a plurality of auxiliary channels 12 having one end communicating with the cooling channel 11 are formed.

The auxiliary channel 12 is exposed as a surface other than the molding surface 13 in the body, and the exposed hole of the auxiliary channel 12 is sealed with a blocking member 14 , and the coolant injected into the cooling channel 11 is exposed. is not leaked through the auxiliary channel (12).

[Second embodiment]

In the method for manufacturing a mold according to the second embodiment of the present invention, all steps are substantially the same as those of the first embodiment. However, at least a portion of the support 132 for supporting the cooling channel forming structure 131 or the cooling channel forming structure 131 constituting the cooling channel core 130 has an elliptical cross-sectional shape, It is characterized in that the angle of the ellipse has a specific shape.

7 is a schematic diagram showing the relationship between a part having an elliptical cross section among cooling channels or supports constituting a core and a mold in a method for manufacturing a mold according to a 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 has an elliptical shape, and the long axis direction of the ellipse and the bottom surface of the mold (the bottom surface of the lower mold) form It is formed so that the angle θ may be 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 structure 131 for forming a cooling channel is formed in an ellipse, the angle θ between the long axis direction of the ellipse and the bottom surface of the mold is 45° or more, It is possible to reduce the resistance to the flow of the molten metal coming up from the bottom of the mold when pouring the molten metal, so that the structure 131 for forming the cooling channel is thin and can be prevented from being damaged by the resistance of the molten metal during the filling process of the molten metal. have.

[Third embodiment]

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

As shown in FIG. 8 , a spiral concave-convex portion 131a is formed in a part of the structure 131 for forming a cooling channel. The spiral concave and convex portion 131a is formed of a screw thread portion 131aa and a screw concave portion 131ab, and a cross-section of the screw thread portion 131aa and the screw concave portion 131ab intersects and connects.

The spiral concave-convex portion 131a is preferably formed in a portion that requires strong cooling or where the diameter of the cooling channel cannot be increased compared to other portions. The surface shape of such a core is transferred through the casting process, and as shown in FIG. 9 , when the cross section crosses the convex part and the concave part inside the mold 10 manufactured after casting, the cooling channel 12 is formed into a spiral. to form

According to the third embodiment of the present invention, the cooling channel having the spiral concavo-convex portion has an increased cooling area compared to the conventional cooling channel having a smooth surface (cooling channel formed during machining), so that even with the same diameter, a better cooling effect is obtained. can be obtained In particular, the spirally formed cooling channel can increase the speed of the cooling water and prevent the cooling channel from clogging due to lime growing in the portion where the fluid is stagnant in the cooling channel by forming a vortex.

[Explanation of code]

10: casting for mold

10': mold

11: cooling channel

12: auxiliary channel

13: molding surface (cavity)

14: blocking member

100: mold

110: hieroglyph

120: lower type

130: middle character

131: structure for forming a cooling channel

132: support

133: base

Claims

body and

a cooling channel formed inside the body;

and one or more auxiliary channels connected to at least one surface of the body while communicating with the cooling channel,

At least one of the auxiliary channels is an arch shape for a mold casting.
The method of claim 1,

The cooling channel communicating with the auxiliary channel is a mold casting made of a shape-adaptive type.
The method of claim 1,

The auxiliary channel includes a pillar portion extending from one surface of the body;

A mold casting having a shape including a connecting portion connected in a curved shape to communicate with the cooling channel from the pillar portion.
The method of claim 1,

At least a portion of the cooling channel or the auxiliary channel is formed in an elliptical cross section,

An angle of intersection between the long axis direction of the oval and the bottom surface of the mold is 45° or more.
5. The method of claim 4,

An angle of intersection between the long axis direction of the oval and the bottom surface of the mold is 60° or more.
The method of claim 1,

At least a portion of the cooling channel is a casting for a mold in which a spiral irregularity is formed on the inner surface.
The method of claim 1,

The cross-section of the cooling flow passage in which the spiral irregularities are formed has a shape in which a convex portion and a concave portion are intersected and connected.
A mold having the structure of the 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.
9. The method of claim 8,

One end of the auxiliary channel is formed on a surface other than the molding surface, and the hole formed by the one end is sealed through a sealing member.
9. The method of 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 a mold;

pouring and solidifying the molten metal into the mold;

removing the mold and the core for forming a cooling channel from the solidified casting;

The core includes a structure for forming a cooling channel and at least one support supporting the structure for forming a cooling channel,

At least one of the supports is a method of manufacturing a casting for a mold made of an arch shape.
12. The method of claim 11,

The core for forming the cooling channel further includes a base,

One end of the support is a method of manufacturing a casting for a mold that is fixed to the base.
12. The method of claim 11,

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 connected in a curved shape to be connected to the structure for forming a cooling channel from the pillar portion.
12. The method of claim 11,

The mold has an upper mold and a lower mold,

The base is a method of manufacturing a casting for a mold that is inserted into the upper die.
12. The method of claim 11,

At least a portion of the structure or support for forming the cooling channel has an elliptical cross-section, and the cross-section of the long axis of the elliptical cross-section and the bottom surface of the mold is formed to be 45° or more.
12. The method of claim 11,

A method of manufacturing a casting for a mold in which spiral irregularities are formed on the surface of a part of the structure for forming the cooling channel.
17. The method of claim 16,

The method of manufacturing a casting for a mold in which the helical irregularities have a cross-section connected to a convex portion and a concave portion intersecting each other.
A method for manufacturing a mold, wherein the mold casting according to any one of claims 1 to 7 is machined to form a molding surface for molding an object.