JPH08158089A - Production of porous forming die and porous forming die - Google Patents

Abstract

PURPOSE: To produce a porous forming die wherein plural air holes are regularly arranged while reducing the internal stress for a short time. CONSTITUTION: A grid-like member 26 is mounted on a conductive coating material 21 applied on a pattern 20 in a first stage, a non-conductive spherical body 30 is fixed on each intersection 28 of the member 26 in a second stage, and an electrocast layer is formed on the member in a third stage. The die consisting of one or N electrocast layers formed in the first and third stages is released from the pattern 20, the remaining member 26 and spherical body 30 are removed, and the plural air holes piercing the intersection 28 of the grid-like communicating groove or grid-like communicating hole and opened on the die surface at a specified interval from one another are formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a porous molding die used as a hollow molding die or an injection molding die for producing a plastic molding, and a press die for producing a fibrous molding layer body. More specifically, the present invention relates to a method for producing a porous molding die and a porous molding die, which are capable of regularly arranging a plurality of vent holes formed by electroforming.

[0002]

2. Description of the Related Art First, the structure of a porous mold of this type and an example of its use will be described with reference to FIG. In FIG. 7, the porous molding die 50 has a large number of ventilation holes 50a having a minute diameter, and a texture pattern in a vacuum molding machine 54 in which a vacuum pump 51, a heater 52, and a clamp 53 are arranged. It is equipped with the molding surface formed on the upper side. This porous mold 5
When vacuum-molding an automobile interior part such as a door trim skin and a crash pad skin using 0, first, the sheet material 55 is heated and softened by the heater 52, and the sheet material 55 is clamped above the molding die 53. Fix with.
Then, by operating the vacuum pump 51, the air between the sheet material 55 and the molding die 50 is sucked through the ventilation hole 50a to make a vacuum state between the sheet material 55 and the molding die 50, and then the sheet material 55 is molded. The sheet material 55 is molded into the same shape as the molding die 55 by being attracted to the mold and brought into close contact with the molding surface of the molding die 50.

By the way, in order to obtain a dense reversibility such as a texture pattern, it is desirable that a large number of small vent holes are formed in the mold, and many small vent holes can be formed by machining or electric discharge machining. Forming is not realistic. Therefore, conventionally, a porous mold is manufactured by the manufacturing method described below.

First, as described in JP-A-64-17888 and JP-A-1-309990, a conductive layer is formed on the surface of a model, and the conductive layer has a predetermined thickness. Form a solvent layer. Then, by placing a plurality of particles such as polystyrene at a desired position of this solvent layer,
The solvent layer is evaporated to deposit a plurality of particles on the conductive layer in a predetermined arrangement state. After that, the model is immersed in an electrolytic solution containing nickel, copper, etc. in an electroforming tank, and an electroforming treatment is performed to deposit metal such as nickel, copper, etc. so as to fill the intervals between the particles on the surface part of the conductive layer. -Laminate to form an electroformed shell. Next, the model is taken out of the electroforming tank, the electroformed shell is peeled from the model, and the electroformed shell is immersed in a solvent to elute and remove particles from the electroformed shell, thereby having a large number of vent holes. An electroformed body (porosity forming type) is manufactured.

Further, as described in JP-A-6-25885, a large number of discharge holes are formed in an electroformed master by electroforming, and a flammable mesh member is attached to the electroformed master. . After that, the electroforming master is immersed in an electrolytic solution containing nickel, copper, etc. in an electroforming tank, and the electroforming treatment is performed while discharging gas from the discharge port of the electroforming master to form a mesh member on the surface of the electroforming master. A metal such as nickel or copper is deposited and laminated so as to fill the space of (1) to form an electroformed layer, and these steps are repeated to form a forming die that is a laminated body. Then, the electroforming master is taken out of the electroforming tank, the mold is separated from the electroforming master, and the mold is heated in an oven to remove the mesh portion sandwiched between the electroformed layers. (EN) A porous electroformed mold (a porous mold) having a large number of ventilation holes and a mesh-shaped communication hole which communicates across the large numbers of ventilation holes.

[0006]

However, in the prior art method for producing a porous mold, firstly, JP-A-64-17888 and JP-A-1-309990.
In the one described in the publication, after forming a solvent layer on the conductive layer of the model, a plurality of particles such as polystyrene are arranged at desired positions of the solvent layer, but a large number of particles are
Since a small size is usually used to secure a small diameter of the ventilation holes, it is difficult to arrange them and the mutual spacing between multiple particles is close and metal deposition by electroforming cannot be performed. However, there is a problem that it is difficult to produce an effective porous mold.

Further, in the one disclosed in Japanese Patent Laid-Open No. 6-25885, in order to form a plurality of ventilation holes in the porous molding die, electroforming treatment is performed while discharging gas from a plurality of discharge ports. Therefore, since the metal discharge is hindered by the gas discharge, it takes a long time to mold each electroformed layer, and the gas discharge force is applied to the many vent holes blocked by each electroformed layer. Internal stress is generated by this force and the strain of each electroformed layer is increased. Therefore, there is a problem that it is difficult to make the mesh member and each electroformed layer in close contact with each other. However, there is a problem in that it is not possible to regularly arrange air holes in the porous mold because the holes are blocked.

The present invention has been made to solve such a problem, and has a porous mold capable of regularly arranging a large number of ventilation holes in a short time while reducing the internal stress. It is an object to provide a manufacturing method thereof.

[0009]

In order to solve the above problems, in the method for manufacturing a porous molding die and the porous molding die according to the present invention, the method for manufacturing a porous molding die according to claim 1 comprises a model. A first step of applying a conductive coating on the surface of the conductive coating and attaching a grid member on the conductive coating; and a second step of mounting a non-conductive spherical body on each intersection of the grid member, A third step of forming an electroformed layer on the grid-shaped member, and if necessary, further mounting the non-conductive spherical body on the non-conductive spherical body;
The process is repeated to form a mold made of an electroformed layer of 1 or N on the model, and the mold is separated from the model, and the remaining lattice-like member and the non-conductive spherical shape are left. The body is removed, and a plurality of through holes are formed on the surface of the mold through the grid-like communication grooves and the intersections of the grid-like communication grooves to penetrate the mold and to open on the surface at predetermined intervals. It forms pores.

According to a second aspect of the present invention, in the manufacturing method of the first aspect, the grid-like member is attached on the non-conductive spherical body as necessary, and further, at each intersection of the grid-like member, the grid-like member is provided. Attaching a non-conductive spherical body, and the third step
The process is repeated to form a mold on the model from electroforming of 1 or N, and the mold is separated from the model to remove the remaining lattice-like member and the non-conductive spherical body. Through the grid-shaped grooves on the surface of the mold, the grid-shaped communication holes inside, and the intersections of the grid-shaped grooves and the grid-shaped communication holes, and keep a predetermined distance from each other on the surface of the mold. A plurality of vent holes that open as a result are formed.

According to a third aspect of the present invention, in the manufacturing method according to the first aspect or the second aspect, the second step of attaching the non-conductive spherical body on each intersection of the lattice-shaped member is performed on the lattice-shaped member. After applying an adhesive, the plurality of non-conductive spheres are evenly diffused and adhered onto the lattice-shaped member, and among the plurality of non-conductive spheres attached to the lattice-shaped member, This is performed by removing the non-conductive spheres attached to the intersections of the grid-like member, leaving the non-conductive spheres.

According to a fourth aspect of the present invention, in the manufacturing method according to each of the first to third aspects, a plurality of the lattice-like members are arranged in parallel in one direction and a first linear portion and the first linear portion. A plurality of second linear portions arranged in parallel in a direction orthogonal to each other is configured in a lattice shape, and by varying the distance between the first linear portions and the distance between the second linear portions, The distance between the plurality of ventilation holes is changed.

According to a fifth aspect of the present invention, there is provided a porous molding die having a plurality of ventilation holes penetrating through the molding die, wherein each of the plurality of ventilation holes is a lattice shape formed on the surface of the molding die. It penetrates through each intersection part of a groove | channel, and is opening to the surface of the said mold mutually at predetermined intervals.

According to a sixth aspect of the present invention, in the porous molding die of the fifth aspect, the grid-shaped communication holes are formed inside the mold, and the plurality of ventilation holes are formed in the grid-shaped grooves and the grid-shaped communication holes. Through the respective intersections, and are opened at a predetermined distance from each other on the surface of the mold.

[0015]

As described above, according to the method for manufacturing the porous mold and the porous mold of the present invention, the non-conductive spherical bodies are attached to the respective intersections of the grid-like member mounted on the conductive paint of the model. That is, it is possible to arrange a plurality of ventilation holes regularly by an extremely simple work, and to arrange a grid-shaped member and a non-conductive spherical body on a conductive paint, and to form a large number of ventilation holes and a grid shape by electroforming. Since the grooves and the grid-shaped communication holes are formed, it is possible to reduce distortion of the electroformed layer due to internal stress generated inside each electroformed layer during the electroforming process in a short time,
As a result, even if the electroformed layer becomes thick, a sufficient space can be provided in the electroformed layer, and porosity can be secured in multiple directions.

Further, after a plurality of non-conductive spherical bodies are evenly diffused and adhered on the grid-shaped member coated with the adhesive,
Since the non-conductive spheres attached to each intersection are left behind, the non-conductive spheres to each intersection of the grid-like member can be removed in a short time and in a very simple operation. Can be attached and arranged.

Further, by varying the distance between the linear portions of the grid-like member, the distance between the plurality of non-conducting spherical bodies, and hence the distance between the plurality of ventilation holes, can be changed. Can be arranged regularly.

Furthermore, since a plurality of vent holes penetrate the mold through the intersections of the grid-like communicating holes and are opened at a predetermined distance from each other on this surface, the automobile interior member It is possible to suck the sheet material for molding with substantially the same suction force throughout.

Further, since a plurality of ventilation holes pass through the intersections of the grid-like grooves and the grid-like communication holes and are opened at a predetermined interval on the surface of the mold, a sufficient space is provided. Since it has the porosity and can secure the porosity in multiple directions, it is possible to suck the sheet material for molding the automobile interior member with substantially the same suction force over the entire sheet.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A porous mold and a method for manufacturing the same according to an embodiment of the present invention will be described below with reference to the drawings.
FIG. 1A is a cross-sectional view showing the structure of the porous molding die of this embodiment, and FIG. 1B is a cross-sectional view taken along the line AA of FIG. 1A, showing the structure of the porous molding die of this embodiment. FIGS. 2 to 5 are cross-sectional views for explaining the method for manufacturing the porous forming die in this embodiment, and FIG. 6 is a diagram showing a modification of the porous forming die in this embodiment. Note that an example of using the porous molding die is the same as that described with reference to FIG. 7, so description thereof will be omitted.

In FIGS. 1 (a) and 1 (b), reference numeral 1 is a porous mold, which is formed by depositing a metal such as nickel or copper by electroforming, for example, a first electroformed layer. 2,
It is a plate-like body in which a second electroformed layer 3 and a third electroformed layer 4 (the number of these layers is arbitrary) are laminated, and protrudes from the central portion (projects in the Z-axis direction). It is formed in an uneven shape having a convex plate portion 5. In addition, the porous mold 1 is opened in the surface 1A (the surface of the first electroformed layer 1) and is in two directions (X and Y axis directions) orthogonal to the direction in which the convex plate portion 5 projects (Z axis direction). ) And a plurality of ventilation holes 7 having a minute diameter and penetrating the porous mold 1.
The lattice-shaped grooves 6 extend in the X-axis direction and are provided in a plurality in parallel in the Y-axis direction, and the first communication hole portions 10 that extend in the Y-axis direction and are provided in a plurality in parallel in the X-axis direction. Second communication hole 1
1 and the distances A and B between the first communication hole portions 10 and between the second communication hole portions 11 are the same as each other in the method for manufacturing a porous mold described below. Casting layer 2
In order to effectively deposit nickel, copper and the like in the electroforming process of No. 4 to No. 4, the range is 0.8 mm to 3.0 mm.

The plurality of vent holes 7 are in the shape of a continuous string of balls pressed against each other, and the direction in which the convex plate portion 5 projects is the Z-axis direction.
And penetrates the porous mold 1 through either the first communication hole portion 10 of the lattice-shaped groove 6 or each intersection 12 with the second communication hole portion 11. Also, a plurality of ventilation holes 7
Is in the range of 0.3 mm to 1.0 mm in order to effectively perform the electroplating treatment of nickel, copper, etc. of the electroformed layers 2 to 4 in the method for producing a porous mold described later. Is opened at the front surface 1A (and the back surface 1B) of the porous mold 1 while maintaining the interval (distance between the diameter outer circumference of each vent hole 7), and suction is possible without impairing the transferability of the surface, The diameter is within the range of 1.0 mm to 2.0 mm.

Next, a method of manufacturing the above-mentioned porous mold will be described with reference to FIGS.

(1) First, as shown in FIG. 2 (a), a convex model 20 (reverse shape of the porous molding die 1), which is the same as the molded product, is made of epoxy resin, polyester resin, etc. The conductive paint 21 is applied to the entire surface of the model 20 (convex side) and dried. An epoxy-based paint containing copper or silver, a thin film silver layer by a silver mirror reaction, or the like is used as the conductive paint 21. Then, after the electrically conductive coating material 21 is dried, as shown in FIG. 2B, the entire surface of the dried electrically conductive coating material 21 is electrically conductive such as glass fiber coated with an adhesive. Flammable grid-like fiber member 2
Paste 5. This lattice fiber member 25 is shown in FIG.
As shown in (b) and FIG. 2C, a plurality of longitudinal fiber portions 26 (first linear portions) arranged in parallel in one direction (X-axis direction) and a direction orthogonal to the longitudinal fiber portions 26. (Y-axis direction)
A plurality of horizontal fiber portions 27 (second linear portion) arranged in parallel with each other
And the thickness of each fiber portion 26, 27 is within the range of 0.3 mm to 2.0 mm, and each longitudinal fiber portion 2
The distance A between the 6 and 26 and the distance B between the horizontal fiber portions 27 and 27 are set within the range of 1.3 mm to 3.0 mm. Therefore, each fiber portion 2 of this lattice-like fiber member 25
By varying the intervals A and B of 6, 27, the number of non-conductive spherical bodies 30 to be arranged and the distance between them are desired, that is, the number of ventilation holes 7 of the porous molding die 1 to be arranged. It is easy to make the interval desired. (First step)

(2) Then, as shown in FIG.
The longitudinal fiber portion 26 and the transverse fiber portion 27 of this lattice-like fiber member 25
The non-conducting spherical body 30 is provided on each intersection 28 with
Are attached (fixed) according to the following procedure. The non-conductive spherical body 30 is made of a styrene resin or an acrylic resin that can be dissolved in a solvent and has a diameter of 1.0 mm to
The size of 2.0 mm is used.

First, as shown in FIG. 3A, the model 2
When a large number of non-conductive spherical bodies 30 are evenly dropped (diffused or scattered) from the upper side of 0 to the grid-like fiber member 25, an adhesive is applied over the entire surface of the grid-like fiber member 25. Therefore, the plurality of non-conductive spherical bodies 30 are randomly attached on the plurality of longitudinal fiber portions 26 and the transverse fiber portions 27.

Then, as shown in FIG. 3 (b), the model 20 itself is inverted so that a plurality of non-conducting spheres placed on the model 20 between the fiber portions 26 and 27 of the lattice fiber member 25. The body 30 is dropped and removed, and as shown in FIG. 3 (c), the non-conducting spheres that are on the fiber portions 26 and 27 of the grid-like fiber member 25 and are attached to portions other than the intersections 28. The body 30 is removed. As a result, the plurality of non-conducting spherical bodies 30 attached to the grid-like fiber member 25 have a predetermined distance C (distance between the diameter outer circumferences of the respective non-conducting spherical bodies 30) of 0.3.
It can be regularly arranged within a range of mm to 1.0 mm. (Second step)

(3) Next, the model 20 on which the conductive paint 21, the grid-like fiber member 25 and the non-conductive spherical member 30 are arranged is
As shown in FIG. 4, it is immersed in an electrolytic solution 36 in an electroforming tank 35, a metal electrode 37 of nickel, copper or the like in the electrolytic solution 36 is connected to a positive electrode, and a conductive paint 21 is connected to a negative electrode. Electricity is applied to perform electroforming treatment. As a result, a metal such as nickel or copper is deposited on the electrically conductive coating material 21 to form the first electroformed layer 2. However, no metal is deposited on the grid-like fiber member 25 and the plurality of non-conductive spherical bodies 30. Since the grid-shaped communicating holes 5 and the vent holes 7 are formed without being deposited, the first electroformed layer 2 is kept to a thickness such that the non-conductive spherical body 30 is exposed. (Third
Process)

(4) By the way, when the size of the non-conductive spherical body 30 is smaller than the desired thickness of the first electroformed layer 2, FIG.
As shown in (a), the model 20 is taken out of the electrolytic solution 35, and the non-conductive spherical body 30 is further adhered onto the non-conductive spherical body 30 with an adhesive or the like, and the model 20 is put into the electrolytic solution 35 again. Perform electroforming. By repeating this, the first electroformed layer 2 to the third electroformed layer 4 having a desired thickness are obtained.

(5) Further, on the first electroformed layer 2, as shown in FIG.
As shown in (b), when the second electroformed layer 3 is further formed to form the grid-shaped communication holes 38 and the plurality of ventilation holes 7, the model in which the formation of the first electroformed layer 2 is completed. The grid-like fibrous member 25 is adhered to the plurality of non-conductive spheres 30 on each of the intersections 28 so as to be exposed from the first electroformed layer 2. According to the same procedure as the process, the non-conductive spherical body 3 is provided on each of the intersections 28 of the grid-like fiber member 25 attached on the first electroformed layer 2.
After 0 is attached, the second electroformed layer 30 is formed by electroforming according to the same procedure as the third step shown in (3) above. By repeating this, the third electroformed layer 4, ...
.., molding of the Nth electroformed layer can be obtained.

(6) As described above, the first electroformed layer 2 or the second electroformed layer 3, the third electroformed layer 4, ... On the model 20.
.. When the mold, which is a laminated body including the Nth electroformed layer, is molded, the model 20 is taken out of the electrolytic solution 36, the model is separated from the model 20, and the lattice-like fiber member remaining in the mold is formed. When 25 and a plurality of non-conductive spherical bodies 30 are burned in an oven or the like (not shown) or extracted and removed with a solvent or the like, as shown in FIGS. 1 (a) and 1 (b), they are separated from each other at predetermined intervals. A porous mold in which a plurality of continuous ventilated ventilation holes 7 and a lattice-shaped groove 6 are formed, or as shown in FIGS. 6A and 6B, the lattice-shaped groove 6 and a plurality of communication holes are formed. Along with the pores 7, inside the second electroformed layer 3 and the third electroformed layer 4, grid-like communicating holes 38 are formed which are arranged in series in a direction in which the convex portions 5 project with respect to the grid-like grooves 6. A porous mold 40 is produced. This porous mold 40 is shown in FIG. 6 (a) and FIG.
As shown in (b), the grid-shaped communication holes 38 are formed in the second electroformed layer 3 and the third electroformed layer 4, respectively, and the projections 5 project from the grid-shaped communication holes 38. In the two directions (X and Y axis directions) orthogonal to the direction (Z axis direction) which has the same configuration as the grid-like grooves 6 opening on the surface of the first electroformed layer 2 and the vertical communication hole portion 41. A plurality of horizontal communication holes 42 are provided, and a plurality of ventilation holes 7 pass through each intersection 43 of the vertical communication holes 41 and the horizontal communication holes 42.

[0032]

As described above, according to the method for producing a porous mold and the porous mold of the present invention, a non-conductive spherical body is formed at each intersection of the grid-like member mounted on the conductive paint of the model. Adhering, it is possible to arrange a plurality of ventilation holes regularly by an extremely simple work, and to arrange a grid-shaped member and a non-conductive spherical body on a conductive paint, a large number of ventilation holes by electroforming, Since the grid-shaped grooves and grid-shaped communication holes are formed, it is possible to reduce distortion of the electroformed layer due to internal stress generated inside each electroformed layer during the electroforming process in a short time. Even if the thickness is increased, a sufficient space can be provided in the electroformed layer, and porosity can be secured in multiple directions. As a result, at the time of molding, all the vent holes suck the sheet material over the entire surface with a substantially uniform suction force, so that the sheet material is evenly adhered to the molding die and the molding die for the molded product is formed. It is possible to secure a uniform reversibility with respect to.

Further, after a plurality of non-conductive spherical bodies are evenly diffused and adhered on the grid-shaped member coated with the adhesive,
Since the non-conductive spheres attached to each intersection are left behind, the non-conductive spheres to each intersection of the grid-like member can be removed in a short time and in a very simple operation. Since they can be attached and arranged, the plurality of ventilation holes can be formed more accurately so as to keep a predetermined distance from each other.

Furthermore, by varying the distance between the linear portions of the grid-like member, the distance between the plurality of non-conducting spherical bodies, and thus the distance between the plurality of ventilation holes, can be changed. Since it can be arranged regularly, the number of ventilation holes in the porous mold must be changed or the distance between them must be changed according to various conditions when molding the sheet material. Is possible.

Furthermore, since a plurality of ventilation holes pass through the mold through the intersections of the grid-like communication holes and are opened on this surface at a predetermined interval, at the time of molding,
By all the air holes, the sheet material is sucked over the entire surface with a substantially uniform suction force, and the sheet material is evenly adhered to the molding die, so that the molded product can be uniformly inverted with respect to the molding die. It becomes possible to secure.

Further, since a plurality of ventilation holes pass through the intersections of the grid-like grooves and the grid-like communicating holes and open at the mold surface at predetermined intervals, a sufficient space is provided. Since it has the porosity and can secure the porosity in multiple directions, it is possible to suck the sheet material for molding the automobile interior member with substantially the same suction force over the entire sheet.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a porous molding die according to an embodiment of the present invention, in which (a) is a cross-sectional view and (b) is a view taken along the line AA of (a).

2A and 2B are views for explaining a method for manufacturing a porous mold according to an embodiment of the present invention, in which FIG. 2A is a cross-sectional view showing a state in which conductive paint is applied on a model, and FIG. FIG. 3C is a cross-sectional view showing a state in which the grid-like fiber member on the conductive paint is attached, and FIG. 7C is a top arrow view showing a state in which the grid-like fiber member on the conductive paint is attached.

FIG. 3 is a diagram for explaining a method for manufacturing a porous mold according to an embodiment of the present invention, in which (a) is a cross section showing a state in which a non-conductive spherical body is dropped onto a lattice-shaped fiber member. Figure,
(B) is a cross-sectional view showing a state in which the non-conducting spheres remaining between the lattice-like fiber members are discharged, and (c) shows a state in which the non-conducting spheres are attached to each intersection of the lattice-like fiber members. FIG.

FIG. 4 is a cross-sectional view showing a state in which a model of a method for manufacturing a porous mold according to an embodiment of the present invention is electroformed.

FIG. 5 is a view for explaining a method for manufacturing a porous mold according to an embodiment of the present invention, in which (a) is an enlarged cross-sectional view showing a procedure for forming a plurality of electroformed layers; (B) is an enlarged cross-sectional view showing a procedure for forming the grid-shaped communication holes inside a plurality of electroformed layers.

6A and 6B are views showing a modified example of the porous mold in one embodiment of the present invention, in which FIG. 6A is a sectional view and FIG. 6B is a sectional view taken along line BB in FIG. 6A.

FIG. 7 is a cross-sectional view showing a structure of a porous molding die according to a conventional technique and a usage mode thereof.

[Explanation of symbols]

 1, 40 Porous mold 2-4 First to third electroformed layer 6 Lattice groove 7 Vent hole 12, 28, 43 Intersection 20 Model 21 Conductive paint 25 Lattice fiber member (Lattice member) 30 N Conductive Spherical Body 38 Lattice Communication Hole

Claims (6)

[Claims] 1. A first step of applying a conductive paint on the surface of a model and attaching a grid member on the conductive paint,
The method includes a second step of attaching a non-conductive spherical body on each intersection of the lattice-like member, and a third step of forming an electroformed layer on the lattice-like member, and the non-conductivity is optional. The step of further mounting the non-conductive spherical body on the spherical body and the first to third steps are repeated to form a mold made of one or N electroformed layers on the model. The mold is separated from the model, the remaining grid-like member and the non-conductive spherical body are removed, and the grid-like grooves are formed on the surface of the mold through the intersections of the grid-like grooves. A method for producing a porous molding die, which comprises forming a plurality of vent holes penetrating the die and opening on the surface of the die at predetermined intervals. 2. A step of mounting the grid-like member on the non-conductive spherical body as required, and further mounting the non-conductive spherical body at each intersection of the grid-shaped member, By repeating 3 steps, a mold is formed on the model by electroforming of 1 or N layers, and the mold is separated from the model to remove the remaining lattice-like member and the non-conductive spherical body. After being removed, it penetrates through the surface of the mold through the grid-like grooves and the grid-like communicating holes inside, and through the intersections of the grid-like grooves and the grid-like communicating holes, and at predetermined intervals with respect to the surface of the mold. The method for producing a porous mold according to claim 1, wherein a plurality of ventilation holes that are opened while maintaining the above are formed. 3. The second step of attaching non-conductive spheres on each intersection of the grid-like member, applying an adhesive to the grid-like member to attach the plurality of non-conductive spheres to the grid. Of the plurality of non-conducting spheres attached to the lattice-like member after being evenly diffused and attached to the lattice-like member, the non-conducting spheres attached to the intersections of the lattice-like member. The method for producing a porous mold according to claim 1 or 2, wherein the removal is carried out by leaving. 4. The grid is composed of a plurality of first linear parts arranged in parallel in one direction and a plurality of second linear parts arranged in parallel in a direction orthogonal to the first linear part. It is comprised in the shape of, It is characterized by changing the space | interval of each said 1st linear part, and mutually changing each space | interval of each 2nd linear part. Item 1
4. The method for producing a porous mold according to claim 3, wherein 5. A porous molding die having a plurality of vent holes penetrating through a mold, wherein each of the plurality of vent holes penetrates through each intersection of grid-like grooves formed on the surface of the mold. A porous molding die, which is opened at a predetermined distance from each other on the surface of the die. 6. The surface of the mold is formed by forming a grid-like communication hole inside the mold, and through which the plurality of ventilation holes pass through the grid-like groove and each intersection of the grid-like communication hole. The porous molding die according to claim 5, wherein the porous molding dies are opened at predetermined intervals.