CN114072246A

CN114072246A - Mold, molding system, and mold manufacturing method

Info

Publication number: CN114072246A
Application number: CN202080018350.4A
Authority: CN
Inventors: 松冈宽高; 古本达明; 新川真人
Original assignee: National University Corp Donghai National University; Qibao Jinxing Industrial Co ltd; Kanazawa University NUC
Current assignee: National University Corp Donghai National University; Qibao Jinxing Industrial Co ltd; Kanazawa University NUC
Priority date: 2020-06-03
Filing date: 2020-06-03
Publication date: 2022-02-18
Anticipated expiration: 2040-06-03
Also published as: JP6811454B1; CN114072246B; JPWO2021245816A1; WO2021245816A1

Abstract

Provided are a mold, a molding system, and a mold manufacturing method, wherein even if the mold is an oil-based mold release agent, the mold does not change the quality of the mold release agent, and the mold can be manufactured with high manufacturing efficiency, while the mold release component of the mold release agent is easily and effectively spread on the inner surface of the mold. A pair of molds having a molded article formed in a gap facing each other has a liquid-impregnated layer formed by melting and solidifying a metal powder and a liquid path section, and a release agent is impregnated into the gap. Specifically, the liquid-impregnated layer is a thin layer and has a high-density liquid-impregnated tube having a fine diameter communicating with the molding surface, and the liquid path portion is a three-dimensional mesh structure in which fine axes form a mesh and is arranged along the liquid-impregnated layer. The release agent flows while being in contact with the three-dimensional mesh structure, and therefore, the release agent has an advantageous effect that the release agent is not unevenly heated and can be inhibited from being deteriorated. The thin shaft is preferably in a form in which the axial direction thereof is not horizontally melted and solidified, because the thin shaft can be easily melted and solidified without collapsing.

Description

Mold, molding system, and mold manufacturing method

Technical Field

The invention relates to a mold, which can restrain the using amount of a release agent even if the mold is an oil release agent, and the release component of the release agent is easy to be effectively coated on the inner surface of the mold. Further, the present invention relates to a molding system including the mold, which can reduce the amount of a mold release agent used and shorten the molding operation. Further, the present invention relates to a mold manufacturing method capable of manufacturing a mold in which a mold surface is easily impregnated with a release agent with high manufacturing efficiency.

Background

The mold is used as a frame for forming a resin molded article or a metal molded article. Conventionally, in order to smoothly release a molded article from a mold, a mold release agent is sprayed on an inner surface of the mold each time the molded article is cast, and the mold is cooled to a temperature at which the mold release agent exerts a mold release effect. The following problems exist: if too much release agent is sprayed before the mold is cooled, only the mold surface is rapidly cooled, a large temperature difference is generated between the mold surface and the inside of the mold, and the mold is easily damaged.

Therefore, patent document 1 discloses a technique for effectively spreading a release component of a release agent on an inner surface of a mold while suppressing the amount of the release agent used. According to the description of patent document 1, there is provided a pipe having a low-density region portion of a predetermined thickness formed along the inner surface shape of a mold and an internal cavity formed in contact with the low-density region portion. The release agent is supplied to the pipe and oozed out to the surface of the mold, whereby the amount of the release agent used can be suppressed and the release effect can be maintained.

Further, cooling water is circulated through a cooling pipe inside the mold, and a mold release agent is supplied to a low-density region portion of the inner surface of the mold through the pipe, and the mold release agent is made to flow inside the mold, thereby cooling the surface of the mold to 240 ℃ or less, which is easy to obtain a mold release effect, and allowing the mold release agent to ooze from the surface of the mold. Thus, compared to a conventional release agent supply method in which a release agent is sprayed from the front surface side of a mold, it is difficult to generate a sharp temperature difference only in the surface portion of the mold, and an uneven thermal strain is not generated in a part of the mold, so that there is an effect that damage to the mold can be suppressed.

The inventors of the present application tried to apply various water-soluble and oil-soluble release agents in order to select the release agent to be supplied to the low-density region. As a result, the oil-based release agent tends to be more excellent in releasability between the mold having the low-density region and the molded article. However, when the oil-based release agent is poured into a hollow pipe in a high-temperature state, a new problem arises as follows: the release agent in contact with the surface of the hollow tube is heated earlier than the release agent flowing in the center of the tube, so that the heated state of the release agent tends to be unbalanced, and properties such as viscosity of the oil-based release agent tend to change.

When the metal powder layer is irradiated with the laser beam having the scanning speed adjusted at the uniform scanning interval and melted and solidified to form the low-density region portion in which the fine pores are continuous, the continuity of the pores tends to be uneven in the portion where the layer thickness is thick. Therefore, when the layer thickness of the low-density region is increased, it is difficult to control the inflow rate of the release agent, and unevenness is observed in bleeding of the release agent. Further, in order to improve the manufacturing efficiency of the mold itself, there is a problem that the thickness of the layer of the molten and solidified mold portion needs to be made thin.

Documents of the prior art

Patent document

Patent document 1: international publication No. 2019-069393

Disclosure of Invention

Problems to be solved by the invention

Accordingly, an object of the present invention is to provide a mold in which a release agent is not deteriorated even in an oil-based release agent and a release component of the release agent is easily and effectively spread on an inner surface of the mold, a molding system in which the amount of the release agent used is suppressed and a molding operation is shortened by using the mold, and a mold manufacturing method capable of manufacturing the mold with high manufacturing efficiency.

Specifically, the object is to provide a mold having a liquid-impregnated layer and a thin layer on a molding surface of the mold, the liquid-impregnated layer being configured as a thin layer by arranging liquid-impregnated pipes of a fine diameter communicating with the molding surface at a high density, the thin layer constituting a liquid path portion on a mold main body side of the liquid-impregnated layer, the liquid path portion having a three-dimensional mesh structure in which fine axes constitute a mesh. Further, another object is to provide a mold in which the liquid-permeable layer is a low-density region portion having a low melt-solidified density so as to be liquid-permeable.

Means for solving the problems

A first aspect of the present invention is a mold which is opposed to each other and is configured as a pair, and includes a liquid wetting unit along a surface on which a molded article is formed, the mold including a liquid wetting layer for wetting a liquid on the surface and a liquid path portion for supplying the liquid to the liquid wetting layer, the liquid wetting layer and the liquid path portion being respectively formed as thin layers which are melt-solidified, the liquid wetting layer being a low-density region portion having a low melt-solidified density and liquid permeability, the liquid path portion having a three-dimensional mesh structure in which meshes are formed by thin axes having a predetermined diameter, being arranged along the liquid wetting layer, and allowing the liquid to pass through the liquid wetting layer and be wetted onto the surface so as not to heat the liquid supplied to the liquid path portion in an unbalanced manner.

The liquid-impregnated layer and the liquid path portion are each formed as follows: the metal powder layer spread to a thickness of about 50 μm was irradiated with a high-power laser beam by 3D printing, and was formed by melting and solidifying the laser beam. The liquid-permeable layer is a low-density region portion in which the molten solidification density of the metal powder is about 40% to 99% so that fine pores are continuous and the liquid-permeable layer has liquid permeability. For example, if the density is about 40%, the liquid is likely to flow from the liquid passage portion, and if the density is 90% or more, only a very small depression is generated on the mold surface, and the molten metal is less likely to adhere.

It is needless to say that the proportion of low density is not necessarily uniform, and the density on the molding surface side of the mold may be made relatively high and the liquid path portion side may be made relatively low. The thickness of the thin layer constituting the liquid-impregnated layer may be determined depending on the shape and size of the mold and the volume of the impregnated liquid, and is not limited. For example, if the thickness of the low-density region is made to be a thin layer of about 1mm to 3mm, the continuity of the pores is less likely to be uneven when forming the low-density region in which fine pores are continuous, which is preferable. In the present invention, the liquid may be soaked by leaching the liquid or may be sprayed out.

When the diameter of the thin shaft constituting the three-dimensional mesh structure of the liquid path portion is about 1mm and the distance between adjacent thin shafts is about 1.8mm, the liquid can be made to flow well, and the liquid supplied to the mold can be supplied to the liquid-impregnated layer away from the supply port. The thickness of the thin layer constituting the liquid path portion may be about 5mm, but is not limited thereto. The form of the three-dimensional mesh structure may be designed by 3d cad software, and for example, the diamond crystal structure may be used, but is not limited thereto.

According to the mold of the first aspect of the present invention, the following advantageous effects, which have not been achieved in the past, can be achieved: even if the release agent is liquid, for example, an oily release agent, the release agent can be prevented from being deteriorated by being contacted with the fine shafts arranged in a three-dimensional mesh and uniformly heated. Further, even if the thickness of the liquid-impregnated layer and the liquid path portion is arbitrary, the functions thereof can be easily maintained, and by forming the liquid-impregnated layer and the liquid path portion to be thin layers, a mold in which the release agent is easily leached can be manufactured with high manufacturing efficiency.

A second aspect of the present invention is a mold which is opposed to each other and is configured as a pair, and includes a liquid wetting unit along a surface on which a molded article is formed, the mold including a liquid wetting layer for wetting a liquid on the surface and a liquid path portion for supplying the liquid to the liquid wetting layer, the liquid wetting layer and the liquid path portion being respectively formed as thin layers which are melt-solidified, the liquid wetting layer including liquid wetting pipes arranged at a predetermined density and communicating with the surface, the liquid path portion having a three-dimensional mesh structure in which a mesh is formed by thin shafts having a predetermined diameter, being arranged along the liquid wetting layer, and being configured to allow the liquid to pass through the liquid wetting layer and to be wetted onto the surface so as not to heat the liquid supplied to the liquid path portion in an unbalanced manner.

The liquid-impregnated layer and the liquid path portion are each formed as follows: the metal powder layer spread to a thickness of about 50 μm was irradiated with a high-power laser beam by 3D printing, and was formed by melting and solidifying the laser beam. Liquid-infiltrated tubes having a diameter of about 50 to 150 μm are formed at intersections of a lattice having a longitudinal dimension of about 1 to 2 mm. Further, it is preferable that the thickness of the thin layer constituting the liquid-impregnated layer is about 1mm, since the liquid is easily and uniformly leached and the strength can be secured, but the thickness is not limited thereto.

According to the mold of the second aspect of the present invention, the following advantageous effects, which have not been achieved in the past, can be achieved: even if the release agent is liquid, for example, an oily release agent, the release agent is contacted with the fine shafts arranged in a three-dimensional mesh and uniformly heated, and thus the release agent can be inhibited from being deteriorated. Further, even if the thickness of the liquid-impregnated layer and the liquid path portion is arbitrary, the functions thereof can be easily maintained, and by forming the liquid-impregnated layer and the liquid path portion to be thin layers, a mold in which the release agent is easily leached can be manufactured with high manufacturing efficiency.

A third aspect of the present invention is the mold according to the first or second aspect, wherein the thin shaft is not horizontally melted and solidified in the axial direction. When the metal powder is thinly spread and the horizontal portion is melted and solidified by the high-power laser, if the lower cavity is formed, the horizontal portion is collapsed, and the shape of the thin shaft is easily changed to the collapsed shape. According to the third aspect of the invention, since the thin shaft is not horizontal in the axial direction, the thin shaft which is melted and solidified is not collapsed, and the liquid flow space between the thin shaft and the thin shaft is hardly deformed, and the liquid can be easily and smoothly supplied.

A fourth aspect of the present invention is the mold according to the first to third aspects, wherein in the three-dimensional mesh structure, the fine axis has a diamond crystal structure, has an outer diameter of 0.7mm to 1.3mm, a melt-solidification density of 10% to 35% in a vertical cross section, and a melt-solidification density of 10% to 65% in a horizontal cross section, and is composed of a first fine axis constituting an upper vertical portion, a second fine axis, a third fine axis, and a fourth fine axis extending obliquely downward and uniformly from a lower end of the first fine axis, and a fifth thin shaft, a sixth thin shaft and a seventh thin shaft extending vertically downward from the lower ends of the second thin shaft, the third thin shaft and the fourth thin shaft to form a lower vertical part, the diamond crystal structure is constituted by the unit structures being stacked in a vertical direction such that the upper vertical portion is continuous with the lower vertical portion.

According to the fourth aspect of the invention, since the three-dimensional mesh structure is a diamond crystal structure, not only the strength of the liquid path portion is high, but also a space in which the liquid flows so as to contact the thin axis in both the vertical direction and the horizontal direction is secured, and the liquid is not unevenly heated, and therefore, the liquid is easily supplied to the liquid-impregnated layer.

A fifth aspect of the present invention is the mold according to the first to fourth aspects, wherein a layer thickness of the liquid-impregnated layer is 0.8mm or more and 3.0mm or less, a layer thickness of the liquid path portion is 3.5mm or more and 6.0mm or less, and a width of the liquid-impregnated layer is the same as a width of the liquid path portion. According to the fifth aspect of the present invention, since the liquid is easily extracted from the molding surface of the mold and the thickness of the layer is thin, the mold can be manufactured with high manufacturing efficiency.

A sixth aspect of the present invention is the mold according to the second to fifth aspects, wherein a low-density portion in which fine pores are continuous is provided between the liquid-impregnated layer and the liquid path portion. According to the sixth aspect of the invention, since the liquid-impregnated layer is connected to the liquid path portion through the low-density portion, the strength of the liquid-impregnated layer is high.

A seventh aspect of the present invention is the mold according to the first to sixth aspects, wherein the surface for molding is subjected to carbon coating processing. According to the seventh aspect of the invention, the inflow resistance when the molten material constituting the molded article flows into the gap formed by the pair of molds is reduced, and therefore the molten material smoothly flows in.

An eighth aspect of the present invention is a molding system including a liquid circulation mechanism for circulating a liquid of at least one system, the mold including the first to seventh aspects, wherein the liquid circulation mechanism includes a pump for causing the liquid to flow from the liquid tank into the liquid circulation path, a liquid tank for circulating the liquid through the mold and back to the liquid tank, and a liquid circulation path for causing the liquid to flow from the liquid tank into the liquid circulation path, and causing the liquid to infiltrate from the surface through the liquid infiltration unit and for recovering a remaining liquid that does not infiltrate from the surface into the liquid tank, and the liquid is a mold release agent for spreading the mold release agent on the surface.

The liquid circulated in the liquid circulation mechanism is not limited to the release agent. In addition to the system for circulating the release agent, it is needless to say that a liquid circulation mechanism for circulating cooling water may be provided as the second system. According to the eighth aspect of the present invention, the residual liquid not infiltrated from the liquid infiltrating unit is recovered, and the release agent capable of obtaining the release effect is spread on the inner surface of the mold at a minimum. This makes it possible to reduce the amount of the release agent used, reduce the environmental load, and facilitate wastewater treatment.

A ninth aspect of the present invention is the molding system of the eighth aspect, wherein the liquid circulation mechanism includes a check valve disposed upstream of the liquid immersion unit, and gas generated at least along with the molding does not flow into the liquid circulation path upstream of the check valve.

According to the ninth aspect of the present invention, it is needless to say that the liquid release agent that has flowed in cannot flow back to the upstream side of the check valve, and at least the release agent or the gas generated by vaporization of water cannot flow back to the upstream side of the check valve, so that the release agent can smoothly flow into the mold at the time of the subsequent molding operation, and the advantageous effect of shortening the molding step can be achieved.

A tenth aspect of the present invention is a mold manufacturing method for manufacturing a mold by using a mold body as a base, uniformly laying a metal powder on the base in a thin manner, irradiating the metal powder with a high power laser beam, melting and solidifying the metal powder to form a solidified layer, and laminating the solidified layer, wherein the high power laser beam is irradiated from a design outer peripheral position of a liquid infiltration pipe for infiltrating a liquid into a mold molding surface to a position spaced apart by a predetermined distance, and the metal powder is melted and solidified to the design outer peripheral position of the liquid infiltration pipe by heat of melting and solidifying the metal powder at the irradiated position to form the liquid infiltration pipe as a pipe having a fine diameter facing the mold molding surface, and the spaced distance is 100 μm or more and 150 μm or less.

The diameter of the metal powder was about 30 μm, and the spread uniform metal powder layer was about 50 μm. If the design aperture of the liquid immersion tube is 50 μm, the aperture is slightly larger than the outer diameter of the metal powder, but the oversize is approximately the same as the thickness of the metal powder layer. When the high power laser is scanned, the metal powder is melted up to the periphery of the scanning track, and therefore, when the laser is scanned to the design position of the outer periphery of the liquid immersion pipe, the metal powder at the position of the outer periphery is melted, the liquid immersion pipe cannot be formed into a pipe, and the liquid immersion layer cannot function. In order to form the liquid-infiltrated tube into a tube, the distance between the scanning position at which the high-power laser beam is irradiated and the designed outer circumferential position of the liquid-infiltrated tube may be selected within a range of 100 μm to 150 μm, depending on the output of the high-power laser beam and the irradiation speed of the laser beam.

According to the tenth aspect of the present invention, by irradiating the high-power laser beam from the design position on the outer periphery of the liquid-infiltrated tube to the predetermined distance to melt and solidify the metal powder layer, it is possible to manufacture a mold which can function as a tube even if the liquid-infiltrated tube has a pore diameter of 50 μm and can leach the liquid out of the molding surface.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the first and second aspects of the present invention, the following advantageous effects, which have not been achieved in the past, can be achieved: even if the release agent is a liquid, for example, an oily release agent, the release agent uniformly contacts the fine shafts arranged in a three-dimensional mesh, and the release agent is inhibited from being deteriorated by partial heating of the liquid. Further, even if the thickness of the liquid-impregnated layer and the liquid path portion is arbitrary, the functions thereof can be easily maintained, and by forming the liquid-impregnated layer and the liquid path portion to be thin layers, a mold in which the release agent is easily leached can be manufactured with high manufacturing efficiency.

According to the third invention of the present invention, the following advantageous effects can be achieved: the shape of the thin shaft which is melted and solidified is not collapsed, and the liquid flow space between the thin shaft and the thin shaft is difficult to deform, and the liquid is easy to be smoothly supplied.

According to the fourth aspect of the present invention, since the three-dimensional mesh structure is a diamond crystal structure, the liquid path portion has high strength, and a space in which the liquid flows so as to contact the thin shaft in both the vertical direction and the horizontal direction is secured, and the liquid is not unevenly heated, and thus the liquid is easily supplied to the liquid-impregnated layer.

According to the fifth aspect of the present invention, since the liquid is easily extracted from the molding surface of the mold and the thickness of the layer is small, the mold can be manufactured with high manufacturing efficiency.

According to the sixth aspect of the present invention, since the liquid-permeable layer is connected to the liquid path portion through the low-density portion, the strength of the liquid-permeable layer is high.

According to the seventh aspect of the present invention, since the inflow resistance when the molten material constituting the molded article flows into the gap formed by the pair of molds is reduced, the molten material smoothly flows in.

According to the eighth aspect of the present invention, the amount of the release agent used can be suppressed, the environmental load can be reduced, and the wastewater treatment can be easily performed.

According to the ninth aspect of the present invention, it is needless to say that the liquid release agent that has flowed in cannot flow back to the upstream side of the check valve, and at least the release agent or the gas generated by vaporization of water cannot flow back to the upstream side of the check valve, so that the release agent can smoothly flow into the mold in the subsequent molding operation, and the advantageous effect of shortening the molding step can be achieved.

According to the tenth aspect of the present invention, it is possible to manufacture a mold which can function as a tube and can leach a liquid out of a molding surface even when the liquid-infiltrated tube has a pore diameter of 50 μm.

Drawings

Fig. 1 is an explanatory diagram of the structure of a mold (example 1).

Fig. 2 is a perspective view illustrating a crystal structure of diamond (example 1).

Fig. 3 is a side view for explaining a step of molding a cell structure (example 1).

Fig. 4 is a plan view illustrating a scanning track of the high-power laser (embodiment 1).

Fig. 5 is a perspective view illustrating an example of a three-dimensional mesh structure (example 2).

Fig. 6 is a perspective view illustrating an example of a three-dimensional mesh structure (example 3).

Fig. 7 is a perspective view illustrating an example of a three-dimensional mesh structure (example 4).

Fig. 8 is a cross-sectional view illustrating a low-density portion in which fine pores are continuous (example 5).

Fig. 9 is a cross-sectional photograph (see fig.) of the liquid-impregnated layer and the liquid path portion.

Detailed Description

A pair of molds having a molded article formed in a gap facing each other has a liquid-impregnated layer formed by melting and solidifying a metal powder and a liquid path section, and a release agent is impregnated into the gap. More specifically, the liquid-impregnated layer is a thin layer and has a high-density fine-diameter liquid-impregnated tube communicating with the molding surface. The liquid path portion has a three-dimensional mesh structure in which fine axes form a mesh, and is arranged along the liquid-impregnated layer. The release agent uniformly contacts the fine shaft constituting the three-dimensional mesh structure and flows into the fine shaft, whereby the release agent is prevented from being unevenly heated, and the release agent is prevented from being deteriorated.

Example 1

In example 1, a mold having a liquid immersion unit and a molding system including the mold will be described with reference to fig. 1 to 4 and 9. Fig. 1 shows an explanatory diagram illustrating the structure of the mold. Fig. 1 (a) is an explanatory view showing the overall structure of the molding system including the mold. Fig. 1 (B) is a perspective view showing the right surface of the nested mold 1 having the liquid-infiltrating unit as an upper side, and fig. 1 (C) is a perspective view showing only the internal structure of the nested mold. Fig. 1 (D) shows a partially enlarged cross-sectional view of a portion of the broken-line circle of fig. 1 (C). In the following embodiments, the cross-sectional view of the mold and the perspective view of the liquid path portion constituting the liquid immersion unit show the molding surface side upward in the drawing.

Fig. 9 (a) shows a cross-sectional photograph of the liquid-impregnated unit portion of the mold fabricated by 3D printing. Fig. 9 (B) is a partially enlarged sectional photograph of the liquid-impregnated layer, and fig. 9 (C) is a partially enlarged sectional view of the liquid path portion. In fig. 1, for ease of understanding, the exhaust pipe, the cooling pipe, and the like other than the nest die are omitted. Fig. 2 shows a perspective view of a diamond crystal structure, and fig. 3 shows an explanatory view of a process of forming a cell structure by a high-power laser. Fig. 4 shows an explanatory diagram illustrating a scanning track of the high-power laser.

In example 1, a mold 100 is composed of a fixed mold 110, a movable mold 120, and a nest mold 1 having a liquid immersion unit (see fig. 1 a). The fixed die 110 has a depressed portion 111 having a circular cross section formed in a stepped manner at a central portion thereof, and a melt injection hole 112 for injecting a molten metal is formed at a lower side thereof.

The movable mold 120 has a fixed recess 121 into which the nest mold 1 is fitted, at a position facing the recessed portion 111. The outer shape of the nest die 1 is formed into a two-stage cylindrical shape in which the front portion on the molding surface 10 side has a small diameter and the base portion has a large diameter. The shape of the gap formed by the cylindrical portion 11 of the front portion, the cylindrical portion 12 of the base portion, and the recessed portion 111 corresponds to the shape of the molded article.

The movable mold 120 is moved in the horizontal direction by a drive mechanism not shown. The movable mold 120 is moved toward the fixed mold 110 and fixed in position, and a molten metal is injected into a gap 113 formed between the fixed mold 110, the movable mold 120, and the nest mold 1 through a molten metal injection hole 112 on the back surface side of the fixed mold 110 to form a molded product. After the molten metal is solidified, the movable mold is moved to return to the initial position, and the molded article is taken out.

The molded article may be difficult to be released from the mold due to, for example, a difference in thermal expansion coefficient between the molded article and the mold. Since the temperature after the molten metal is poured and before the molten metal is solidified is lowered, a part of the molded article is confined to a part of the mold, and the mold may be difficult to be released. Therefore, in example 1, the liquid infiltrating means 20 was provided in the end face portion of the nest mold 1, which is one of the positions where the molded product of the mold is difficult to be released, and the molded product was easily released. In addition, in order to improve the mold releasability, carbon coating processing (carbon coating) is performed on the entire molding surface of the mold.

The nest die 1 includes a liquid wetting unit 20 formed to be curved on the molding surface 10 (see fig. 1B). The width of the liquid infiltration unit 20 is about 5 mm. The liquid infiltration unit 20 is formed by: the high-power laser beam is irradiated to a metal powder layer uniformly spread from the molding surface 10 side in the order of the liquid-impregnated layer 30 and the liquid path portion 40, the metal powder is melted and solidified, and the liquid-impregnated unit 20 is formed by 3D printing. In the mold of the present embodiment, only the nest mold 1 has the liquid immersion unit, but needless to say, the fixed mold 110 and the movable mold 120 may have the liquid immersion unit.

The liquid-impregnated layer 30 has a thickness of about 1mm, and has liquid-impregnated tubes 31, … …, and the liquid-impregnated tubes 31 are arranged at a predetermined density toward the molding surface so as to communicate the liquid path portion 40 with the molding surface 10 (see fig. 1 (D) and 9 (B)). The diameter of the liquid-impregnated tube 31 may be about 50 μm to 150 μm so that the liquid can seep out to the molding surface 10 side. When the diameter is about 50 μm, the trace of the liquid-impregnated tube 31 is difficult to transfer to the surface of the molded article, and therefore, it is preferable. Further, a carbon coating processed layer 13 is laminated on the molding surface side of the liquid-impregnated layer 30. The thickness of the carbon coating processed layer 13 is not limited as long as it does not block the thin film layer of the liquid immersion pipe 31. For example, in the case where the diameter of the hole of the liquid immersion pipe 31 is 100 μm so that the thickness of the thin film layer does not exceed the radius of the liquid immersion pipe, the thickness of the carbon coating processed layer 13 may be about 20 μm.

The liquid path portion 40 has a thickness of about 5mm, and the thin shaft is formed to form a three-dimensional mesh structure (see fig. 1 (D) and 9 (a) and (C)). In example 1, an example in which the three-dimensional mesh structure is the diamond crystal structure 41 is described with reference to fig. 2. Fig. 2 (a) shows a perspective view of a unit structure 410 constituting a diamond crystal structure. Fig. 2 (B) shows a state in which the upper vertical portion and the lower vertical portion of the cell structure are connected and stacked. Fig. 2 (C) shows a state in which the cell structures are stacked and juxtaposed. For ease of understanding, the stacking direction is referred to as a vertical direction, and the parallel direction is referred to as a horizontal direction.

The diamond crystal structure 41 is configured by stacking the unit structures 410 in the vertical direction and arranging them in the horizontal direction (see fig. 2 (C)). In the unit structure 410 (see fig. 2 a), the first thin shaft 421 constitutes the upper vertical portion 411, the second thin shaft 422, the third thin shaft 423, and the fourth thin shaft 424 extend obliquely downward from the lower end of the first thin shaft 421, and the fifth thin shaft 425, the sixth thin shaft 426, and the seventh thin shaft 427 extend vertically downward from the respective lower ends so as to constitute the lower vertical portion 412.

The lower vertical shaft 412 of the unit structure disposed above is integrated with the upper vertical part 411 of the unit structure disposed below, and the unit structures 410 are stacked to form a three-dimensional mesh structure (see fig. 2C). The diameter of the thin axis in any direction of the three-dimensional mesh structure is about 1.0 mm. With respect to the length of each thin shaft, the first thin shaft 421, the fifth thin shaft 425 to the seventh thin shaft 427 is about 0.9mm, and the second thin shaft 422 to the fourth thin shaft 424 are about 1.8 mm.

When the upper vertical portion 411 of the unit structure constituting the lower layer and the lower vertical portion 412 of the unit structure constituting the upper layer are integrated so as to be connected to each other, the length of the vertical axis 428 connected vertically and the tilt axis 429 formed by the second to fourth thin axes are the same and about 1.8mm (see the broken line (B) in fig. 2). By repeating the stacking and arrangement of the unit structures 410, a three-dimensional mesh structure in which the axial direction of any thin axis is not horizontally melted and solidified is formed, and a diamond crystal structure 41 in which the vertical axis 428 and the tilt axis 429 have the same length and all the adjacent axes are uniformly expanded at intervals of 120 degrees is formed.

In the three-dimensional mesh structure of these fine axes, the axes of the upper vertical portion 411 and the lower vertical portion 412 are at the respective vertex positions of a regular hexagon in a plan view, and the space surrounded by the respective vertices is a liquid flow space in the vertical direction (see fig. 2 (C)). Further, a liquid flow space is formed from the side to penetrate each vertex of the hexagon, and liquid can smoothly flow in both the horizontal and vertical directions.

The melt solidification density of the vertical cross section of the liquid path portion 40 is set to 10% or more and 35% or less depending on the cutting position. For example, the cut surface is about 15% at a vertical cross-sectional position passing through only the oblique thin axis, and about 30% at a vertical cross-sectional position passing through the axial center of the vertical thin axis. The melt-solidification density in the horizontal cross section is set to 10% or more and 65% or less depending on the cutting position.

The position of the cut surface at the middle portion of the vertical thin axis is about 12.5%, and the position of the intersection between the vertical thin axis and the first to fourth thin axes is about 30%. And about 60% at the position where the area of the horizontal cross section below the intersection point is the largest. It goes without saying that the melt-solidification density can be changed according to the diameter and the interval of the thin shaft.

The molding system 1000 (see fig. 1 a) including the mold 100 has a liquid circulation mechanism 101 that circulates liquid. The liquid circulation mechanism 101 is composed of a first system 102 for circulating the release agent and a second system 103 for circulating the cooling water. The first system 102 includes a liquid circulation path 50 for flowing the release agent into the nest die 1, a liquid tank 51 for storing the release agent, a pump 52, a liquid circulation path 53 for recovering excess liquid from the die, and a check valve 54.

The liquid path unit 40 constituting the liquid wetting unit is connected to a liquid circulation path 50 for supplying the release agent (see fig. 1 a and 1C). The release agent is pumped from the liquid tank 51 to the liquid circulation path 50 by the pump 52, and flows into the nest die 1. In the nested mold 1, the mold release agent is infiltrated and spread from the molding surface 10 through the liquid infiltration unit 20. The excess release agent that has not been wetted from the molding surface is recovered to the liquid tank 51 through the liquid circulation path 53 (see arrows (a) and (C) in fig. 1).

Since the release agent is pressurized and fed under pressure to the liquid path portion 40 by the pump 52, the release agent is supplied to the entire liquid-impregnated unit 20, and the release agent is impregnated into the molding surface 10 from the liquid-impregnated layer 30. The impregnated release agent conducts and spreads on the surface of the nested mold 1 as a vertical surface, and wets a range larger than the surface area of the liquid-impregnated cell by the release agent. The release agent can be discharged from the liquid-permeable layer 30 into the mold by increasing the pressure by the pump 52.

The check valve 54 is disposed further upstream in the first system 102 than to the liquid infiltration unit 20. The check valve 54 prevents the gas formed by vaporization of the liquid accompanying molding and the mold release agent flowing into the check valve 54 from flowing back toward the liquid circulation path 50 upstream of the check valve 54 in the nest mold 1. This allows the release agent to smoothly flow into the mold in the next molding operation, thereby shortening the molding operation. The form of the check valve 54 is not limited, and may be any valve having a structure in which a valve body operates to prevent a reverse flow by a back pressure of a fluid, for example.

The second system 103 constituting the liquid circulation mechanism includes: a liquid circulation path 60 for circulating cooling water, a cooling pipe 61 (see fig. 1C) formed in the nest die, a cooling water tank 62 for storing cooling water, and a pump 63. The cooling tube 61 has a surrounding tube 64 that surrounds along the periphery of the nesting mold and a straight tube 65 that extends perpendicularly from the beginning and the back of the surrounding tube. The circulating pipe 64 is configured to circulate around the peripheral edge of the nesting mold 1 for about 1 week, then to be bent downward, and to circulate around the peripheral edge of the nesting mold 1 for about half a week, thereby cooling the entire nesting mold 1.

The cooling pipe 61 is connected to a cooling water circulation path 60 (see fig. 1 a and 1C) through which cooling water circulates. The cooling water is caused to flow from the cooling water tank 62 into the cooling water circulation path 60 by the pump 63, and then flows into the nest die 1 and circulates through the cooling pipe 61, and the cooling water is recovered into the cooling water tank 62 through the cooling water circulation path 60 (see arrows (a) and (C) in fig. 1). The entire peripheral surface of the nest die 1 is cooled by the cooling water circulating through the cooling pipe 61, and the die is not damaged by thermal strain even if the layer thickness of the liquid immersion unit 20 is thin. As another example of the second system 103, a pipe for connecting the cooling water may be connected instead of the cooling water tank and the pump, and the cooling water flowing into the mold may be discharged without being collected.

Next, a step of shaping the diamond crystal structure 41 by the high power laser will be described with reference to fig. 3. Fig. 3 (a) shows a state where high-power laser light is irradiated to the uniformly spread metal powder layer 200. Fig. 3 (B) shows a state where the laser irradiation of the first layer is completed and the metal powder layer 201 of the second layer is uniformly spread. Fig. 3 (C) shows a state in which the thin shaft is formed in an inclined manner. The output power of the high power laser was 320W, the scanning speed was about 700mm/s, and the diameter of the focal point of the high power laser was about 200 μm. The scanning speed is in the range of about 600mm/s to 800mm/s, and thus the fine axis having a high density can be melted and solidified.

The diamond crystal structure 41 (see fig. 2C) is formed by melting and solidifying on the base 14 constituting the mold main body by 3D printing (see fig. 1D and fig. 3, respectively). First, the base 14 is fixed on a laser irradiation stage for 3D printing, and the metal powder layer 200 of the first layer is uniformly spread so as to cover the top surface of the base (see fig. 3 a). In example 1, the thickness of the metal powder layer 200 was about 50 μm. The metal powder is a maraging steel powder having an average particle size of about 30 μm.

The position to irradiate the high power laser beam 300 is set according to the horizontal cross-sectional shape of the three-dimensional model prepared in advance. In the first layer, horizontal cross-sectional positions of the fifth, sixth, and seventh fine axes (see fig. 2) constituting the diamond crystal structure 41 are irradiated. The metal powder at the position irradiated with the high power laser beam 300 is melted and solidified, thereby forming the first solidified layer 413, and the first solidified layer 413 forms a lower portion of a vertically extending thin axis (see a hatched portion in fig. 3B). A second layer of metal powder layer 201 is laid uniformly over the first solidified layer 413. Then, a high-power laser beam is irradiated as in the first layer, and a second solidified layer 414 is stacked over the first solidified layer 413.

When the solidified layers are repeatedly stacked to form the tops of the fifth to seventh thin axes extending vertically, the next solidified layer 416 is sequentially stacked upward so as to extend obliquely from the next solidified layer 415 to form the second to fourth thin axes (see fig. 3C). Since each solidified layer is a thin layer, the length of the protrusion to the side of one solidified layer is very small, and even if the protrusion 417 is not supported by the solidified layer of the lower layer, a part of the metal powder is difficult to melt and fall. Furthermore, it is of course possible to scan the high power laser continuously from the top surface of the stage outside the area of the liquid immersion unit.

After the liquid path portion 40 is formed (see (D) in fig. 1), the liquid-wetting layer 30 continuous with the top of the diamond crystal structure 41 is formed. In the liquid-impregnated layer 30, since the metal powder is densely melted and solidified except for the liquid-impregnated tube 31 having a fine diameter, the liquid-impregnated layer 30 can be formed so as to horizontally expand from the top of the diamond crystal structure 41 (see fig. 1 (D) and 9 (a)). Needless to say, the liquid-impregnated layer 30 may be formed by stacking the solidified layers while extending obliquely upward.

Next, a step of forming the liquid-impregnated tube 31 having a very small diameter constituting the liquid-impregnated layer will be described with reference to fig. 4. Fig. 4 is a plan view illustrating a scanning trajectory of the high power laser 300 and a design position of the liquid immersion tube. The case where the design diameter of the liquid-impregnated tube is 150 μm and the design interval of the liquid-impregnated tube is 1mm will be described as an example.

In fig. 4, a circle 301 indicated by a one-dot chain line indicates a position where the high power laser light is not irradiated (see fig. 4 a). Black circles 302 indicate positions where the high-power laser light is intermittently irradiated, dotted circles 303 (see (C) in fig. 4) indicate positions where the high-power laser light is not irradiated, and these aligned circles indicate scanning tracks of the high-power laser light 300. The high power laser beam was irradiated intermittently at an output power of 320W, a scanning speed of about 700mm/s, and a focal diameter of about 200 μm at the center of the circle 302.

Fig. 4 (a) shows a state where the high power laser beam 300 is intermittently irradiated while being moved in one direction, and fig. 4 (B) shows a state where the position of the focal point is moved when the moving direction of the high power laser beam 300 is folded back. Fig. 4 (C) shows a state where the high-power laser beam is irradiated from the design position 32 of the liquid immersion pipe 31 by a predetermined distance. Fig. 4 (D) shows the liquid-infiltrated tube and the region 33 where the metal powder is melted and solidified by heat transfer.

The liquid-infiltrated tube 31 had a diameter of about 150 μm and was disposed at a grid point of about 1mm in both the lateral and longitudinal directions (see fig. 4 (D)). The high power laser is set with a non-irradiation region 34 (see a circle 301 of a one-dot chain line in fig. 4 a) including the design position 32 of the liquid immersion tube and an irradiation region 35 outside the non-irradiation region. The non-irradiated region 34 is a circular region having a diameter of about 450 μm and ranging from about 150 μm from the outer periphery of the design position 32 of the liquid-infiltrated tube.

While the focal point of high power laser light 300 is located in irradiation region 35, high power laser light 300 is intermittently irradiated in a linear scanning trajectory to melt and solidify the metal powder (see black circle 302 in fig. 4 a). When high power laser light 300 reaches the end of irradiation region 35, the position of the focal point of high power laser light 300 moves (see fig. 4B). Next, the moving direction of the high power laser beam is turned back and irradiated (see fig. 4C). When the focal point of the high power laser beam reaches the non-irradiation region 34, the irradiation of the high power laser beam is stopped (see a circle 303 of a broken line in fig. 4C).

The non-irradiated region 34 around the design position 32 is uniformly spread with the metal powder, and the metal powder is melted and solidified by the heat of the molten metal irradiated with the high-power laser. Specifically, under the laser irradiation conditions of example 1, the metal powder in the range of about 100 μm to 150 μm from the boundary of the non-irradiated region was melted to form the melted and solidified region 33 (see the hatched region in fig. 4 (D)).

Therefore, even if the non-irradiation region 34 is set outside the region of the design position 32 of the liquid immersion pipe, the liquid immersion pipe having a pore diameter of a minute diameter can be configured to have a substantially designed pore diameter without clogging (see fig. 9 (B)). Further, by changing the diameter of the non-irradiation region 34, a liquid-impregnated tube having an aperture diameter smaller than 150 μm can be formed. For example, when the aperture of the liquid immersion tube is about 50 μm, the non-irradiation region may be set to a circular region having a diameter of 350 μm so that the laser beam is not irradiated to a region of 150 μm from the outer edge of the design position.

Although not shown in the drawings, a liquid-permeable layer having a liquid-permeable tube may be replaced with a liquid-permeable layer having a low-density region portion with a low melt-solidified density and having liquid permeability. In the low-density region, the high-power laser may have an output power of 320W, a scanning speed of about 1450mm/s to 2000mm/s, a focal diameter of about 200 μm, and a melt-solidification density of 40% to 99%.

Example 2

In example 2, a second example of a three-dimensional mesh structure will be described with reference to fig. 5. Fig. 5 (a) shows a perspective view of the second unit structure. Fig. 5 (B) is a perspective view showing a state in which the second cell structures shown in fig. 5 (a) are arranged side by side in the horizontal direction. In fig. 5, the cell structure arranged in the rear row is shown in color for easy understanding.

The second unit structure 70 constituting the three-dimensional mesh structure is constituted only by the obliquely inclined thin shafts 71. Specifically, 8

thin shafts

71, 71 … … extend obliquely from the center of gravity of the cube 72 inscribed in the second unit structure toward the respective vertices of the cube 72 (see fig. 5 a). An example is shown in which the length of the single side of the cube 72 is about 1.8mm and the single side of the cross section of the thin shaft 72 is about 0.2 mm.

In the three-dimensional model, the horizontal arrangement of the second cell structures 70 is arranged such that the

adjacent cell structures

70 and 70 … … overlap the end portions 73 of the respective thin shafts 71 (see fig. 5B). The vertical arrangement is such that the end surfaces 74 of the thin axes overlap. By forming the three-dimensional mesh structure in which the end portions of the thin shaft 71 overlap, a high-strength liquid path portion in which the thin shaft is integrally formed can be formed.

Example 3

In example 3, a third example of a three-dimensional mesh structure will be described with reference to fig. 6. Fig. 6 (a) is a perspective view showing the third unit structure 80. Fig. 6 (B) is a perspective view of the cell structure shown in fig. 6 (a) arranged side by side in the horizontal direction. In fig. 6, a part of the third unit structure is shown in color.

The third unit structure 80 constituting the three-dimensional mesh structure is constituted only by the obliquely inclined thin shafts 81, as in the second unit structure. Specifically, the third unit structure 80 is formed by combining the intersecting loop structure 82 with the second unit structure 70 of example 2 (see fig. 5 a). In the intersecting loop structure 82, two loops 85 each formed of a thin shaft 81 are orthogonal to each other, and the respective overlapping portions 86 are integrally formed, and the thin shaft 81 passes through the center points of 4

peripheral surfaces

84, 84 … … of a cube 83 inscribing the third unit structure 80.

The fine shafts constituting the intersecting loop structure 82 are inserted through the gaps of the fine shafts constituting the second unit structure 70, and are arranged in the vertical direction and the horizontal direction, thereby forming a three-dimensional mesh structure wound in a locked state with each other (see fig. 6 (B)). According to the third unit structure 80, the number of thin shafts supporting the liquid-impregnated layer can be increased and the thin shafts can be arranged in a dispersed manner.

Example 4

In example 4, a fourth example of the three-dimensional mesh structure will be described with reference to fig. 7. Fig. 7 shows a perspective view of a three-dimensional mesh structure 90. For ease of understanding, fig. 7 is explained based on a view in which the three-dimensional mesh structure 90 is cut into rectangular parallelepiped. For the left side surface 91 of the rectangular parallelepiped in the figure, only the end surfaces of the hexagonal holes extending obliquely upward are shown for easy understanding, and the hexagonal holes extending vertically are omitted.

The three-dimensional mesh structure 90 of example 4 has a honeycomb structure in which hexagonal tubes 92 extending in the axial direction in the vertical direction are filled without gaps, and has a plurality of hexagonal through-holes 93 extending in an obliquely upward direction. The hexagonal through

holes

93 and 93 … … have a predetermined interval, and thereby form a communication hole 95 that horizontally communicates the side walls 94 of the adjacent

hexagonal cylinders

92 and 92 … …. It is needless to say that a plurality of sets of hexagonal through holes extending obliquely upward may be provided, and the sets may be arranged in a direction intersecting the direction.

The release agent flows not only in the axial direction of the hexagonal cylinder 92 (see vertical arrow in fig. 7), but also in the axial direction of the hexagonal through hole 93 (see diagonal arrow in fig. 7) and the axial direction of the communication hole 95 (see hollow arrow in fig. 7). Therefore, even if any one of the holes is clogged, the liquid can be supplied to the liquid-impregnated layer while bypassing the adjacent

hexagonal cylinders

92 and 92. Further, since the three-dimensional mesh structure 90 is formed into a honeycomb structure, the strength of the liquid passage portion can be increased.

Example 5

In example 5, a description will be given of a nest mold 2 having a low-density portion 130 between a liquid-impregnated layer 30 and a liquid path portion 40, with reference to fig. 8. Fig. 8 shows a cross-sectional view of the mold. The liquid-impregnated layer 30 and the liquid path unit 40 have the same structure as in example 1.

The low-density portion 130 is formed by melting and solidifying a metal powder with a high-power laser so that fine pores are continuous in the vertical direction, and has liquid permeability. The low density portion 130 has a melt-solidified density of about 90% to about 95% to facilitate liquid penetration and a layer thickness of about 0.5 mm. The average diameter of the pores was about 100 μm. The output power of the high power laser for molding the low density portion was 320W, the scanning speed was 1450mm/s to 2000mm/s, and the focal diameter of the high power laser was about 200 μm.

By disposing the low-density portion 130 between the liquid-impregnated layer 30 and the liquid path portion 40, the shaping of the liquid-impregnated layer is easier than the shaping of the liquid-impregnated layer directly from the top of the thin shaft as in example 1. This can improve the strength of the liquid immersion unit.

(others)

In the present example, the carbon coating process was performed on the molding surface, but it goes without saying that the carbon coating process may not be performed. Further, although the example in which the liquid-wetting means is provided in a part of the molding surface of the nest die has been described, it goes without saying that the liquid-wetting means may be provided in the entire molding surface. The liquid immersion unit is not limited to only the case where the nested molds have the liquid immersion unit, and it is needless to say that the fixed molds and the movable molds may have the liquid immersion unit. The shape of the molding surface of the mold is not limited, and may be changed according to the shape of the molded article.

The embodiments of the liquid-impregnated layer, the liquid path portion, and the low-density portion constituting the liquid-impregnated unit shown in the present embodiment are examples of thickness, width, shape, melt-solidification density, and the like, and are not limited thereto.

The output power, scanning speed, and focal diameter of the high-power laser disclosed in the embodiments are merely examples, and can be adjusted according to the specification of 3D printing without any problem.

The embodiments disclosed herein are exemplary in all respects and should not be considered as limiting. The technical scope of the present invention is defined by the claims, is not limited to the above description, and is intended to include meanings equivalent to the claims and all modifications within the scope.

Description of the reference numerals

1. 2 … nested molds, 100 … molds, 1000 … molding system,

110 … fixed die, 120 … movable die,

10 … molding surface, 20 … liquid wetting unit, 30 … liquid wetting layer, 40 … liquid path part,

11. 12 … cylindrical part, 13 … carbon coating processing layer, 14 … base platform,

31 … liquid immersion tube, 32 … design position, 33 … melting and solidifying area,

34 … non-irradiation region, 35 … irradiation region,

41 … diamond crystal structure,

50. 53 … liquid circulation path, 51 … liquid tank, 52 … pump, 54 … check valve,

60 … cooling water circulation path, 61 … cooling pipe, 62 … cooling water tank, 63 … pump,

64 … surrounding pipe, 65 … straight pipe,

70 … second unit structure, 71 … thin shaft, 72 … cube, 73 … end, 74 … end face,

80 … third unit structure, 81 thin axes, 82 … crossed ring structure, 83 … cube,

84 …, 85 … two rings, 86 … overlapping,

90 … three-dimensional mesh structure, 91 … left side, 92 … hexagonal cylinder, 93 … hexagonal through hole,

Side wall of 94 …, communication hole of 95 …,

101 … liquid circulation mechanism, 102 … first system, 103 … second system,

111 … recess, 112 … melt injection hole, 113 … gap,

121 … fixed recess, 130 … low-density part,

200. 201 … metal powder layer,

300 … high power laser, 301 … single dot chain line circle,

A black circle of 302 …, a dashed circle of 303 …,

410 … cell structure, 411 … upper vertical portion, 412 … lower vertical portion,

413 … a first solidified layer, 414 … a second solidified layer, 415, 416 … a solidified layer,

417 … protrusion, 421 … first thin shaft, 422 … second thin shaft,

423 … third slender shaft, 424 … fourth slender shaft, 425 … fifth slender shaft,

426 … sixth fine axis, 427 … seventh fine axis, 428 … vertical axis,

429 … tilt axis.

Claims

1. A pair of molds which are opposed to each other and include a liquid-wetting unit along a surface on which a molded article is formed, the molds being characterized in that,

the liquid immersion unit has a liquid immersion layer for immersing the surface with a liquid and a liquid path section for supplying the liquid to the liquid immersion layer,

the liquid-wetting layer and the liquid path portion are respectively formed as thin layers which are melted and solidified,

the liquid-permeable layer is a low-density region portion having a low melt-solidified density and liquid permeability,

the liquid path section has a three-dimensional mesh structure in which a mesh is formed by fine shafts having a predetermined diameter and is arranged along the liquid-permeable layer,

the liquid is caused to penetrate through the liquid-impregnated layer and to be impregnated into the surface so as not to heat the liquid supplied to the liquid path portion in an unbalanced manner.

2. A pair of molds which are opposed to each other and include a liquid-wetting unit along a surface on which a molded article is formed, the molds being characterized in that,

the liquid-impregnated layer has liquid-impregnated tubes arranged at a predetermined density and communicating with the surface,

3. The mold according to claim 1 or 2,

the axial direction of the thin shaft is not horizontally melt-solidified.

4. The mold according to claims 1 to 3,

in the three-dimensional mesh structure, the fine axis becomes a diamond crystal structure,

the outer diameter of the thin shaft is more than 0.7mm and less than 1.3mm,

a melt-solidified density in a vertical cross section of 10% to 35%, a melt-solidified density in a horizontal cross section of 10% to 65%,

the diamond crystal structure is formed by stacking a first thin shaft constituting an upper vertical portion, a second thin shaft, a third thin shaft, and a fourth thin shaft extending obliquely downward from a lower end of the first thin shaft, and a fifth thin shaft, a sixth thin shaft, and a seventh thin shaft extending vertically downward from lower ends of the second thin shaft, the third thin shaft, and the fourth thin shaft so as to constitute a lower vertical portion, wherein the unit structure is formed by vertically stacking the upper vertical portion and the lower vertical portion.

5. The mold according to any one of claims 1 to 4,

the layer thickness of the liquid infiltration layer is more than 0.8mm and less than 3.0mm,

the thickness of the liquid path part is 3.5mm to 6.0mm,

the liquid-impregnated layer has a width equal to that of the liquid path portion.

6. The mold according to any one of claims 2 to 5,

a low-density portion in which fine pores are continuous is provided between the liquid-permeable layer and the liquid path portion.

7. The mold according to any one of claims 1 to 6,

the surface for molding is subjected to carbon coating processing.

8. A molding system having a liquid circulation mechanism that circulates liquid of at least one system, said molding system characterized in that,

having a mold according to any one of claims 1 to 7,

the liquid circulation mechanism comprises a pump, a liquid tank and a liquid circulation path,

the pump flows the liquid from the liquid tank into the liquid circulation path,

the liquid circulation path circulates the liquid through the die and back to the liquid tank,

in the mold, infiltrating the liquid from the face through the liquid infiltrating unit, and recovering the remaining liquid not infiltrated from the face into the liquid tank,

the liquid is a release agent that is spread on the surface.

9. The molding system of claim 8,

the liquid circulation mechanism is provided with a check valve,

the check valve is disposed further upstream than the liquid reaches the liquid immersion unit,

at least gas generated accompanying the molding does not flow into the upstream of the check valve in the liquid circulation path.

10. A mold manufacturing method for manufacturing a mold by using a mold body as a base, uniformly spreading a metal powder on the base in a thin state, irradiating the metal powder with a high-power laser beam, melting and solidifying the metal powder to form a solidified layer, and laminating the solidified layer, characterized in that,

irradiating the high power laser beam from a design outer peripheral position of a liquid immersion pipe for immersing the liquid in the mold molding surface to a position spaced apart by a predetermined distance, melting and solidifying the metal powder at the design outer peripheral position of the liquid immersion pipe by the heat of melting and solidifying the metal powder at the irradiated position, and forming a liquid immersion pipe which is a pipe having a fine diameter facing the mold molding surface,

the separation distance is 100 μm or more and 150 μm or less.