Molding facility, and mold insert manufacturing method

Abstract

To provide a technique for preventing a mold insert from accumulating heat and thereby preventing a molding cycle from becoming longer in a molding facility that performs molding by using a mold having the mold insert.SOLUTION: There is provided a molding facility for molding a product by using a mold having a mold insert for molding at least a part of a shape of the product. The mold insert has a hollow portion. The hollow portion inside the mold insert is made up of a three-dimensional mesh structure in which lattices that form a unit space surrounded with multiple faces are connected. The three-dimensional mesh structure has, for example, a configuration in which multiple cubic lattices are connected in a vertical direction and horizontal direction, or a truss structure in which a vertical columnar member, a horizontal columnar member and a diagonal columnar member are intersected and connected.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to molding equipment using a mold and a method for manufacturing a nest that is used by fitting into a main mold. [Background technology]

[0002] Conventionally, when manufacturing resin molded products using a mold by a method such as injection molding, temperature control has been implemented, such as by providing a cooling passage in the mold body to cool the mold, in order to prevent the temperature of the mold from becoming too high due to the molten resin material and lengthening the molding cycle.

[0003] Furthermore, in injection molding and the like, a nest that can be inserted and removed from the mold body may be used. In molding using a nest, the nest accumulates heat, making it difficult to cool the molded product, so the nest is also cooled. For example, Patent Document 1 discloses an invention relating to a mold in which a cooling passage for flowing cooling water is provided in the insert so that the insert can be cooled, and a manufacturing method thereof. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2020-66048 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, the insert having cooling passages described in Patent Document 1 requires a cooling water circulator to flow cooling water through the cooling passages provided in the insert, which results in the problem that the mold and molding equipment become complex and large-sized.

[0006] Therefore, the applicant investigated a technique for suppressing the temperature rise of the insert by manufacturing the insert from a material with good thermal conductivity (for example, beryllium copper) and transmitting the heat of the insert to the master mold (main die). As a result, it was found that, although it is possible to avoid a longer molding cycle, when beryllium copper is selected as the insert material, there is a problem that the environmental burden may be large when the deteriorated insert is disposed of.

[0007] The present invention has been made against the background described above, and has an object to provide a structure for the inserts in molding equipment that performs molding using a mold having inserts, which structure makes it difficult for the inserts to accumulate heat, thereby making it possible to avoid a long molding cycle. Another object of the present invention is to provide a molding facility equipped with a nest and a method for manufacturing the nest, which can reduce the burden on the environment when the nest is disposed of. [Means for solving the problem]

[0008] In order to solve the above problem, the invention described in claim 1 comprises: A molding facility for molding a product using a mold having a nest for molding at least a part of the shape of the product, The insert is characterized by having a hollow portion.

[0009] The invention described in claim 2 is the molding equipment described in claim 1, The hollow portion of the nest is characterized in that it is configured with a three-dimensional mesh structure in which lattices that form a unit space surrounded by a plurality of faces are connected.

[0010] The invention described in claim 3 is the molding equipment described in claim 2, The lattice constituting the unit space is characterized in that at least one side is open.

[0011] The invention described in claim 4 is the molding equipment described in claim 3, The three-dimensional mesh structure is characterized in that it is composed of a plurality of cubic lattices connected vertically and horizontally.

[0012] The invention described in claim 5 is the molding equipment described in claim 3, The three-dimensional mesh structure is characterized in that it is a truss structure in which vertical columnar members, horizontal columnar members, and diagonal columnar members are cross-connected.

[0013] The invention described in claim 6 is a molding equipment according to any one of claims 1 to 5, The volume of the hollow portion is larger than the volume of the outer shell portion of the insert.

[0014] The invention described in claim 7 is a molding equipment according to any one of claims 1 to 5, The outer shell of the insert is provided with an air injection hole penetrating from the surface of the outer shell to the hollow portion.

[0015] The invention described in claim 8 is the molding equipment described in claim 7, The outer shell portion is provided with an air exhaust hole penetrating from the surface of the outer shell portion to the hollow portion, and air injected through the air injection hole can be exhausted through the hollow portion to the outside of the nest from the air exhaust hole.

[0016] The invention described in claim 9 is the molding equipment described in claim 8, The outer shell portion has a rectangular shape, The air inlet and the air outlet are formed on different surfaces of the outer shell.

[0017] The invention described in claim 10 is the molding equipment described in any one of claims 2 to 4, an air inlet and an air outlet hole are provided in an outer shell portion of the insert, the air inlet and the air outlet hole penetrating from a surface of the outer shell portion to the hollow portion; an air passage extending from the air injection hole to the air discharge hole is provided in the hollow portion, The lattice constituting the unit space is characterized in that at least the lattice surface facing the air passage is open.

[0018] The invention described in claim 11 is a molding equipment according to any one of claims 1 to 5, The hollow portion is characterized by being a vacuum.

[0019] The invention described in claim 12 is a molding equipment according to any one of claims 1 to 5, The nest is characterized in that it is formed by a three-dimensional modeling device that utilizes three-dimensional lamination technology.

[0020] The invention described in claim 13 is a molding equipment according to any one of claims 1 to 5, The insert is characterized in that it is made of a material that places a small burden on the environment when disposed of.

[0021] The invention described in claim 14 is A method for manufacturing a hollow nest for forming at least a part of a shape of a product, the method comprising the steps of: manufacturing the hollow nest using a three-dimensional modeling device that utilizes a three-dimensional lamination technique and is disposed in a container that can be evacuated; transferring the interior of the container to a vacuum state; molding a product in the container, the inside of which is in a vacuum state, by the three-dimensional modeling device; Bringing the interior of the vessel to a pressure equal to the pressure outside the vessel; The present invention is characterized by having the following. Effect of the Invention

[0022] According to the invention described in claim 1, since the insert has a hollow portion, it is possible to reduce the heat capacity compared to an insert that does not have a hollow portion, which makes it difficult for the insert to accumulate heat and contributes to avoiding a long molding cycle.

[0023] According to the invention as recited in claim 2, since the hollow portion is formed by a plurality of lattices, the structure is simplified and the manufacture of the insert is relatively easy.

[0024] According to the invention described in claim 3, at least one side of the lattice is open, so that air circulates within the lattice, which speeds up the transfer of heat and enables the insert to be cooled more quickly.

[0025] According to the invention described in claim 4, since the cubic lattice has a relatively simple framework, the manufacture of the nesting block is relatively easy.

[0026] According to the invention as recited in claim 5, the strength of the insert can be increased with a relatively small weight.

[0027] According to the invention as set forth in claim 6, the relative volume of the hollow portion can be increased, and the heat capacity of the insert can be efficiently reduced.

[0028] According to the invention as recited in claim 7, air can be introduced into the interior of the insert, thereby making it possible to increase the cooling speed of the insert.

[0029] According to the invention as recited in claim 8, air can be circulated in the hollow portion inside the insert, making it possible to further increase the cooling speed of the insert.

[0030] According to the invention recited in claim 9, it is possible to increase the amount of air circulating in the hollow part inside the insert, and to increase the cooling speed of the insert, compared to a case in which an air inlet hole and an air outlet hole are provided on the same surface.

[0031] According to the invention recited in claim 10, an air passage is provided between the air inlet and air outlet of the insert, thereby increasing the amount of air circulating in the hollow portion inside the insert, thereby making it possible to further increase the cooling speed of the insert.

[0032] According to the invention as recited in claim 11, since the hollow portion is a vacuum, the heat capacity of the insert can be further reduced.

[0033] According to the invention as set forth in claim 12, a nest having a hollow portion therein can be formed using a commercially available device, and the cost of molding equipment can be reduced.

[0034] According to the invention as set forth in claim 13, it is possible to reduce the burden on the environment when discarding deteriorated inserts.

[0035] According to the invention as set forth in claim 14, a nesting member the interior of which is in a vacuum state can be easily manufactured. [Brief description of the drawings]

[0036] [Figure 1] 1 is a schematic diagram showing the schematic configuration of an injection molding device using a mold having a nest to which the present invention is applied. [Diagram 2] FIG. 2 is a perspective view showing an example of an insert and a mold in a mold open state. [Diagram 3] 1A and 1B show examples of the cross-sectional structure of a nest used in the injection molding apparatus of the first embodiment of the present invention, where 1A is a cross-sectional view of a nest having a hollow interior, and 1B is a cross-sectional view of a nest having a three-dimensional mesh structure inside. [Figure 4] 13(A) to 13(F) are perspective views showing specific examples of lattices constituting a three-dimensional mesh structure inside a nest of an embodiment. [Diagram 5] 10A is a perspective view showing an example of a nest used in an injection molding apparatus according to a second embodiment of the present invention, and FIG. 10B is a cross-sectional explanatory view showing an example of an air passage inside the nest shown in FIG. [Figure 6] 13(A) and 13(B) are schematic enlarged views each showing a part of an air passage provided in a three-dimensional mesh structure inside a nest. [Figure 7] 11 is an explanatory cross-sectional view showing an example of the configuration of a fitting-type insert and a mold used in the injection molding apparatus of the second embodiment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0037] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. (First embodiment) FIG. 1 shows a schematic diagram of an injection molding machine as a molding facility using a nest. 1 includes a fixed-side cavity insert 11A, a movable-side core insert 11B facing the cavity insert 11A, a fixed-side mold base 12A that holds the cavity insert 11A, and a movable-side mold base 12B that holds the core insert 11B. The cavity insert 11A and the mold base 12A form a fixed-side mold, and the core insert 11B and the mold base 12B form a movable-side mold.

[0038] The fixed mold base 12A is supported by a fixed die plate 13A, and the movable mold base 12B is supported by a movable die plate 13B. The fixed mold base 12A and the cavity insert 11A are provided with a material supply passage 14 (spool, runner, gate, etc.) through which the molten material flows. The fixed die plate 13A is provided with an opening 13a through which an injection nozzle 15 for the molten material faces, and the tip of the injection nozzle 15 is abutted against the entrance of the material supply passage 14.

[0039] On the other hand, the core insert 11B and the movable mold base 12B are configured to be movable up and down via the mold base 12B by a lifting device such as a hydraulic cylinder (not shown). The cavity formed when the core insert 11B is raised and joined to the cavity insert 11A is filled with molten material injected into the passage 14 by the injection nozzle 15, and is cooled and solidified to form a product (molded item). The fixed mold base 12A and the movable mold base 12B are provided with cooling water passages 16 through which cooling water flows.

[0040] 2 shows specific examples of the above-mentioned inserts 11A and 11B and mold bases 12A and 12B. Insert 11A is placed in an inner recess of mold base 12A, and insert 11B is placed in an inner recess of mold base 12B. Mold base 12A containing insert 11A and mold base 12B containing insert 11B are joined together to form a cavity. Incidentally, some of the inserts used in the mold are of a type that is fitted into a recess provided in the master mold (main mold). The molding device to which the present invention is applied is not limited to one that uses a cavity and core insert as shown in Fig. 2, but can also be applied to one that uses a fitting type insert. Such an example will be described later with reference to Fig. 7.

[0041] Furthermore, in this embodiment, the inserts 11A and 11B are completely hollow as shown in FIG. 3(A) or have a three-dimensional mesh structure as shown in FIG. 3(B). Examples of three-dimensional mesh structures include a lattice structure and a truss structure, which is a framework structure with triangles as basic units. Lattice structures include a cubic lattice as shown in Figure 4(A), a cubic lattice with side diagonal supports as shown in (B), a cubic lattice with bottom center supports as shown in (C), a cubic lattice with center supports as shown in (D), a diamond lattice as shown in (E), and an octahedral lattice as shown in (F). Among these lattices, the cubic lattice shown in (A) has the simplest framework, making it relatively easy to manufacture the nest. On the other hand, when a truss structure is adopted, the strength of the nest can be increased with a relatively small framework, and the weight of the nest can be reduced.

[0042] As can be seen from FIGS. 4(A) to (E), there is space within the lattice, so even if the inside is a three-dimensional mesh structure, the nesting can be said to have a hollow portion. The lattices shown in Figures 4(A) to (E) are frameworks made up of multiple columnar members, but they may be walls between the lattices to form closed spaces (rooms), which may be connected horizontally and vertically to form a three-dimensional mesh structure. When walls are provided at the boundaries of the lattices, they may be provided on all sides surrounding the space of each lattice, but it is preferable to leave at least one side open and without walls. This allows air to circulate within the lattice, accelerating heat transfer and increasing the cooling speed of the nesting.

[0043] The thickness of the shell of the nest having the hollow portion as described above depends on the strength of the material of the nest, but is set to a dimension that does not deform due to the pressure of the molten resin injected into the inside of the mold. When the inside has a three-dimensional mesh structure, it is less likely to deform due to external pressure compared to when it is completely hollow, so the thickness of the shell may be made thinner than when it is completely hollow. However, as described later, it is also possible to make the internal space of the nest a vacuum, and in that case, the thickness of the shell is set so that the nest does not deform due to the pressure obtained by adding the pressure of the molten resin injected into the inside of the mold to the atmospheric pressure. The volume of the hollow portion of the nest may be set to be larger than the volume of the shell, thereby increasing the relative volume of the hollow portion and efficiently reducing the heat capacity of the nest.

[0044] Furthermore, when using the injection molding apparatus of this embodiment to manufacture a resin molded product, a material that places a small burden on the environment when discarded, such as iron or aluminum, is selected as the material for the inserts 11A and 11B. If the material for the inserts is a versatile metal such as iron or aluminum, it can also be recycled. In addition, if the inside is a three-dimensional mesh structure, the structure is complex, so it is advisable to use a 3D printer to create the nests 11A and 11B. Materials that can be used with commercially available metal 3D printers vary depending on the manufacturer and method, and there are models that can use stainless steel, tool steel, copper, titanium alloys, etc.

[0045] On the other hand, when manufacturing metal products by casting molten metal using a mold with a nest, the nest is made of heat-resistant ceramics, etc. Specifically, it is possible to form the nest by using a mixture of sand and resin liquid as the material, repeating the process of additively manufacturing the material using a 3D printer and the process of hardening it with an ultraviolet laser after modeling. In this case, too, it is desirable to select a material for the nest that does not contain substances that have a large burden on the environment when disposed of.

[0046] As described above, in the injection molding device of this embodiment, since the inserts 11A and 11B are hollow inside, the heat capacity of the inserts is small, and when cooling the molten resin or molten metal after it is injected into the mold, the temperature can be reduced in a shorter time than when a non-hollow insert is used, thereby shortening the molding cycle and improving manufacturing efficiency. Also, since the three-dimensional mesh structure inside the inserts is formed by multiple lattices, that is, a structure in which the same pattern is repeated, it is relatively easy to create a program for the 3D printer used to manufacture the inserts.

[0047] Second embodiment In the second embodiment, a pair of ventilation holes is provided in a portion of the outer shell of a hollow insert that does not face the cavity, and air flows through the interior to increase the cooling rate. Furthermore, it is preferable to provide the molding device with an air nozzle for injecting air into the inside of the insert through the pair of ventilation holes. In this case, one of the pair of ventilation holes serves as an air injection hole and the other serves as an air discharge hole, increasing the air circulation speed and enabling a faster cooling speed. The air nozzle may be configured integrally with the mold base (metal mold), or may be configured to be moved to the air injection hole of the insert after the mold is opened.

[0048] Fig. 5 shows an example in which the movable core insert 11B shown as an example in the first embodiment is provided with an air injection hole 17a and an air discharge hole 17b. In Fig. 5, (A) is a perspective view of the core insert 11B, and (B) is a cross-sectional plan view of the core insert 11B shown in (A) cut at the position of the air injection hole 17a and the position of the air discharge hole 17b. Although not shown, the fixed core insert 11A may also be provided with a similar air injection hole and air discharge hole. As shown in FIG. 5, the core insert 11B of this embodiment has an air injection hole 17a at the upper left of the front surface, and an air discharge hole 17b at a position corresponding to the lower right of the rear surface when viewed from the front surface side.

[0049] Furthermore, in the nest 11B of this embodiment, by omitting a part of the internal three-dimensional mesh structure, an air passage is formed to improve the flow of air from the air injection hole 17a to the air discharge hole 17b, as shown by the arrow A in FIG. 5(B). Fig. 6 shows an enlarged view of the portion surrounded by dotted line B in Fig. 5(B), which is a part of the air passage inside the insert. In Fig. 6(A), dashed line C represents the lattices that make up the three-dimensional mesh structure. As shown in Fig. 6(A), by omitting some of the multiple lattices that make up the three-dimensional mesh structure, a passage through which the injected air flows is formed with particularly good efficiency, and the cooling speed of the insert can be increased.

[0050] The air passage shown in Fig. 6(B) is formed by forming a part of the lattice that constitutes the three-dimensional mesh structure (part indicated by solid line D) as a wall that does not or does not allow air to pass through easily, forming multiple chambers with openings facing the air passage. With this configuration, a loop-shaped air flow is generated in each chamber, as shown by arrow E in Fig. 6(B), making it easier to cool the entire insert uniformly.

[0051] FIG. 7 shows an example in which the second embodiment is applied to a nesting type connector. The insert 21 shown in Fig. 7 is used by being fitted into a recess 22a provided in a fixed mold 22A. The left and lower parts of the recess 22a in the figure have the same shape as the left side surface and lower surface of the insert 21, and a three-dimensional mesh structure 21c is provided inside. Instead of providing the three-dimensional mesh structure 21c inside the insert 21, the insert 21 may be made completely hollow. Furthermore, an air injection hole 21a and an air discharge hole 21b are provided in a portion of the insert 21 that does not face the cavity. Of these, the air injection hole 21a is provided with a recess into which the tip of the air nozzle 23 can be engaged.

[0052] The right side of the recess 22a provided in the fixed mold 22A is spaced from the right side surface of the insert 21, and a part of the molded product is formed by filling the gap (part of the cavity) between the insert 21 and the recess 22a with molten resin. In addition, a movable mold 22B is disposed above the fixed mold 22A and the insert 21 at a predetermined distance, and another part of the molded product is formed by filling the gap (part of the cavity) between the mold 22B and the mold 22A and the insert 21 with molten resin. At this time, heat is transferred from the molten resin in the cavity to the insert 21 (arrow F), and the temperature of the insert 21 rises.

[0053] Therefore, inside the mold 22A, a cooling water passage 22b for flowing cooling water is provided. Moreover, the insert 21 is configured so that after the cavity is filled with molten resin, the tip of the air nozzle 23 is engaged with the air injection hole 21a and air is blown in while the mold is open, thereby enabling rapid cooling. Although not shown, a part of the three-dimensional mesh structure 21c inside the insert 21 may be omitted to form an air passage from the air inlet 21a to the air outlet 21b.

[0054] 7 has a shape that is inclined with respect to the direction of movement of movable mold 22B, and when the molds are opened to remove the molded product, insert 21 is pulled out of recess 22a of mold 22A. When insert 21 is pulled out, air discharge hole 21b is separated from the wall surface of mold 22A, so that air injected into insert 21 from air injection hole 21a by air nozzle 23 can be more easily discharged from air discharge hole 21b, thereby enabling the temperature of insert 21 to be lowered more quickly.

[0055] (Modification) In either the first or second embodiment, the insert 11A, 11B, or 21 may be formed so that the internal hollow portion is in a vacuum state. Note that an insert having an internal hollow portion in a vacuum state can be manufactured by installing a 3D printer in a vacuum tank and modeling the insert. Here, the inserts having a vacuum in the hollow portion include those having a lattice that forms an internal three-dimensional mesh structure, and those having no three-dimensional mesh structure and being completely hollow. As described above, by making the hollow portion inside the insert a vacuum, the heat capacity of the insert can be further reduced, and the cooling speed during cooling can be increased to shorten the molding cycle.

[0056] In addition, when manufacturing a nesting piece whose hollow portion is in a vacuum state, the following steps are carried out: transferring the inside of a vacuum tank (a container capable of creating a vacuum inside) to a vacuum state; molding the nesting piece inside the vacuum tank with a three-dimensional modeling device (3D printer) that utilizes three-dimensional lamination technology; and transferring the inside of the vacuum tank to a pressure equal to the pressure outside the vacuum tank.

[0057] Although the present invention has been described above based on the embodiments, the present invention is not limited to the above-mentioned embodiments. For example, if the diameter of the lattice forming the three-dimensional mesh structure inside the nest is sufficiently small, the amount of heat transferred through the lattice material can be reduced, so that the temperature inside the nest can be made less likely to rise by using air as a heat insulator without creating a vacuum in the hollow part inside.

[0058] It is also possible to provide a space without a lattice and filled with air at the part inside the insert facing the cavity of the mold, so that the air in this space acts as a heat insulator, making it difficult for heat from the molten resin filling the cavity to be transmitted to the center of the insert, thereby suppressing the temperature rise of the insert. In addition, in the above embodiment, it has been described that the nest having a three-dimensional mesh structure therein is created using a 3D printer, but the creation of the nest is not limited to using a 3D printer, and any configuration of three-dimensional modeling device utilizing three-dimensional stacking technology may be used.

[0059] Furthermore, in the above embodiment, the present invention has been described as being applied to an injection molding device that supplies molten resin into a mold to form a resin molded product, but the present invention is not limited to injection molding devices, and may be applied to a device that supplies molten metal from a supply device into a mold to cast a metal product. In this case, too, the same effects as those of the above embodiment can be obtained, and by using a insert having a hollow portion inside, the heat capacity of the insert can be reduced, and the cooling rate when the molten metal injected into the mold is cooled and solidified can be increased. [Explanation of symbols]

[0060] 10 Injection molding equipment 11A Cavity nest 11B Core nest 12A Fixed side mold base 12B Moving mold base 13A Fixed side die plate 13B Movable die plate 14 Material supply passage 15 Injection nozzle 16 Cooling water passage 17a Air injection hole 17b Air exhaust hole 21 Nesting 21a Air injection hole 21b Air exhaust hole 21c 3D mesh structure 22A Fixed side mold 22B Movable side mold 22a Recess 22b Cooling water passage 23 Air nozzle

Claims

1. A molding facility for molding a product using a mold having a nest for molding at least a part of the shape of the product, The molding equipment is characterized in that the insert has a hollow portion.

2. 2. The molding equipment according to claim 1, wherein the hollow portion of the nesting member is configured as a three-dimensional mesh structure in which lattices each forming a unit space surrounded by a plurality of surfaces are connected.

3. 3. The molding facility according to claim 2, wherein the lattice constituting the unit space has at least one open side.

4. 4. The molding equipment according to claim 3, wherein the three-dimensional mesh structure is configured by connecting a plurality of cubic lattices in the vertical and horizontal directions.

5. 4. The molding equipment according to claim 3, wherein the three-dimensional mesh structure is a truss structure in which vertical columnar members, horizontal columnar members, and diagonal columnar members are cross-connected.

6. 6. The molding equipment according to claim 1, wherein the volume of the hollow portion is larger than the volume of the outer shell portion of the insert.

7. 6. The molding equipment according to claim 1, wherein an outer shell portion of the insert is provided with an air injection hole penetrating from a surface of the outer shell portion to the hollow portion.

8. 8. The molding equipment according to claim 7, wherein the outer shell portion is provided with an air exhaust hole penetrating from a surface of the outer shell portion to the hollow portion, and air injected through the air injection hole can be exhausted through the hollow portion to the outside of the insert from the air exhaust hole.

9. The outer shell portion has a rectangular shape, 9. The molding equipment according to claim 8, wherein the air inlet and the air outlet are formed on different surfaces of the outer shell portion.

10. an air injection hole and an air discharge hole are provided in an outer shell portion of the insert, the air injection hole and the air discharge hole penetrating from a surface of the outer shell portion to the hollow portion; an air passage extending from the air injection hole to the air discharge hole is provided in the hollow portion, The molding equipment according to any one of claims 2 to 4, characterized in that the lattice constituting the unit space has at least an open lattice surface facing the air passage.

11. The molding equipment according to any one of claims 1 to 5, characterized in that the hollow portion is a vacuum.

12. The molding facility according to any one of claims 1 to 5, wherein the nest is formed by a three-dimensional modeling device that utilizes a three-dimensional lamination technique.

13. 6. The molding equipment according to claim 1, wherein the insert is made of a material that imposes a small load on the environment when disposed of.

14. A method for manufacturing a hollow nest for forming at least a part of a shape of a product, the method comprising the steps of: manufacturing the hollow nest using a three-dimensional modeling device that utilizes a three-dimensional lamination technique and is disposed in a container that can create a vacuum inside, the three-dimensional modeling device comprising: transferring the interior of the container to a vacuum state; molding a product by the three-dimensional modeling device in the container, the inside of which is in a vacuum state; Bringing the interior of the vessel to a pressure equal to the pressure outside the vessel; A method for manufacturing an insert, comprising the steps of:

Images