CN110670094A - Method for producing metal porous molded article - Google Patents

Method for producing metal porous molded article Download PDF

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Publication number
CN110670094A
CN110670094A CN201910589568.4A CN201910589568A CN110670094A CN 110670094 A CN110670094 A CN 110670094A CN 201910589568 A CN201910589568 A CN 201910589568A CN 110670094 A CN110670094 A CN 110670094A
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conductive layer
molded article
metal
fine particles
mold
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CN201910589568.4A
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CN110670094B (en
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渡部雅也
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Santo Industry Co Ltd
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Santo Industry Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25DPROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D1/00Electroforming
    • C25D1/08Perforated or foraminous objects, e.g. sieves
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00Moulds or cores; Details thereof or accessories therefor
    • B29C33/38Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
    • B29C33/3814Porous moulds
    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25DPROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D1/00Electroforming
    • C25D1/10Moulds; Masks; Masterforms

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

The invention provides a method for manufacturing a metal porous forming product, which can manufacture the metal porous forming product more easily. The method for producing a metal porous molded article comprises: a step 1 of causing fine particles (3) to collide with the surface of a conductive layer (2) formed on the surface of a molding master die (1) for a metal porous molded article, thereby peeling off the conductive layer at the position where the fine particles collide with the surface of the metal porous molded article, and forming fine holes (2a) penetrating the surface of the master die (1) in the conductive layer (2); and a step 2 of immersing the master model in an electroforming solution containing no surfactant to electroform the surface of the conductive layer (2).

Description

Method for producing metal porous molded article
Technical Field
The present invention relates to a method for producing a metal porous molded article.
Background
Conventionally, a metal molded product is sometimes made porous by providing through holes depending on the application. For example, a mold for transferring the shape of the mold surface to a molded article may be provided with a large number of through holes, which are small enough not to affect the shape of the mold surface, from the mold surface to the back surface, to manufacture a breathable mold. In the case of this air-permeable mold, the shape of the mold surface can be accurately transferred to the molded article by sucking from the plurality of through holes and bringing the molded article into close contact with the mold surface.
As a method for manufacturing the air-permeable mold, for example, patent document 1 discloses a method for manufacturing an air-permeable mold in which a conductive layer provided on a surface of a forming mandrel (master mold) of the air-permeable mold is implanted with a large number of short fibers and the conductive layer implanted with the short fibers is electroformed. According to this manufacturing method, the metal constituting the mold is not electrodeposited on the implanted short fibers and the extension lines of the tips of the short fibers at the time of electroforming. Therefore, it is possible to manufacture an air-permeable mold in which a through hole is formed in a portion of the surface of the conductive layer corresponding to the portion implanted with the short fibers.
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication No. 2-225687
Disclosure of Invention
Problems to be solved by the invention
However, in the production method of patent document 1, it is very complicated to implant many short fibers into the conductive coating. Moreover, there is a risk that: when the air-permeable mold is released from the master mold, short fibers may remain in the through-holes of the air-permeable mold and need to be removed, and the complexity of the manufacturing operation may be further increased.
Accordingly, the present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a method for manufacturing a breathable mold, which can manufacture a breathable mold more easily.
Means for solving the problems
As a means for solving the above problems, the present invention is a method for producing a porous metal molded article, comprising: a step 1 of forming fine holes penetrating the surface of a master mold for molding of a porous metal molding in a conductive layer by colliding fine particles with the surface of the conductive layer formed on the surface of the master mold to peel off the conductive layer at positions where the fine particles collide with the conductive layer; and a step 2 of immersing the master model in an electroforming solution containing no surfactant to perform electroforming on the surface of the conductive layer.
Accordingly, hydrogen generated on the surface of the conductive layer during electroforming is less likely to be released from the conductive layer by using an electroforming solution containing no surfactant. Meanwhile, hydrogen generated on the surface of the conductive layer is easily concentrated in minute holes formed in the conductive layer and penetrating through the surface of the master mold. As a result, the metal constituting the mold is inhibited by the concentrated hydrogen and is not electrodeposited at a portion corresponding to the minute hole. Therefore, the die formed by electroforming has through holes formed at positions corresponding to the positions of the minute holes. Therefore, for example, a metal porous molded article can be easily produced as compared with a method of implanting a large number of short fibers.
The 1 st step may be a step of: an ejection device for ejecting a large number of fine particles from an ejection port by air pressure is used, the ejection port is moved while being spaced apart from the conductive layer by a predetermined distance, and a large number of fine particles are ejected from the ejection port and collide with the entire surface of the conductive layer, thereby forming fine holes over the entire conductive layer. Accordingly, since the injection hole is spaced apart from the conductive layer by a predetermined distance, the size of the minute hole formed in the conductive layer can be easily controlled to be constant. Therefore, the size of the through-hole formed in the metal porous molded article can be easily controlled to be constant. Further, since fine pores are provided throughout the entire conductive layer, a through-hole is also formed throughout the entire metal porous molded article. Therefore, the air-permeable mold can be easily and uniformly sucked. This improves the transferability from, for example, an air-permeable mold, which is one of the porous metal moldings, to the resin molded article.
Further, the fine particles may be made of a material harder than a material constituting the conductive layer. Accordingly, the constituent material of the fine particles is harder than the constituent material of the conductive layer, and thus peeling of the conductive layer occurs more reliably. The minute holes can be formed more accurately in the conductive layer according to the size of the collided minute particles and the collided part.
Further, the material constituting the conductive layer may be silver. Accordingly, the conductivity of silver is high, and electroforming can be performed more accurately, so that the productivity of the metal porous molded article is improved.
Further, the fine particles may be spherical, and the outer diameter of the fine particles may be 15 to 30 times the thickness of the conductive layer. Accordingly, since the fine particles are spherical, the collision mode of the fine particles is constant, and the shape and size of the fine pores formed in the conductive layer are also easily constant. If the outer diameter of the fine particles is such a size, the conductive film can be peeled off more reliably, and therefore, the accuracy of the size and position of the fine holes formed in the conductive layer can be further improved.
Further, the porous metal molded article to be produced can be an air-permeable mold. Accordingly, the air-permeable mold having the through-hole can be manufactured.
In addition, the metal porous molded article to be produced may be a metal molding jig for fiber-reinforced plastic molding. Accordingly, a metal forming jig capable of more accurately forming the fiber reinforced plastic can be manufactured.
ADVANTAGEOUS EFFECTS OF INVENTION
The method for manufacturing the air-permeable mold can be used for manufacturing the air-permeable mold more easily.
Drawings
Figure 1 is a side view showing a master mould.
Fig. 2 is a side view showing the inverted mold formed with respect to the master mold.
FIG. 3 is a side view showing a master model formed on an inversion mold.
Fig. 4 is a side view showing a master model provided with a conductive layer.
Fig. 5 is a schematic view showing a case where fine particles are ejected toward the conductive layer on the surface of the master mold.
Fig. 6 is a schematic view showing a state where fine particles are caused to collide with the conductive layer.
FIG. 7 is a schematic view showing a case where a conductive layer on the surface of a master mold is electroformed.
Fig. 8 is a schematic view showing a case where a gas-permeable mold is formed on the surface of a conductive layer.
FIG. 9 is a schematic view showing a metal molding jig for fiber-reinforced plastic molding.
Fig. 10 is a schematic view showing a process of molding a fiber reinforced plastic using a metal molding jig.
Description of the reference numerals
1. A female die; 2. a conductive layer; 2a, a micro-hole; 3. micro particles; 4. electroforming liquid; 5. a gas-permeable mold; 8. a metal forming jig; 10. an injection device; 10a, injection port
Detailed Description
(embodiment mode 1)
Hereinafter, embodiment 1 of a method for manufacturing an air-permeable mold, which is an example of the method for manufacturing a porous metal molded article according to the present invention, will be described with reference to the drawings. First, a manufacturing process of a master model 1 for molding a breathable mold according to the present embodiment will be described with reference to fig. 1 to 3. As shown in fig. 1, a master 6 is formed, and the master 6 has the same shape as that of a molded article finally molded by an air-permeable mold. For the master 6, for easy processing, for example, wood can be used. If necessary, a vinyl synthetic leather having a fine uneven pattern such as a leather grain pattern may be bonded to the surface 6a of the master 6 using a wax sheet or the like. The pattern of the vinyl synthetic leather or the like is a pattern to be finally transferred to the surface of the molded article.
As shown in fig. 2, the reverse mold 7 having the reverse concavo-convex shape to the outer shape of the master 6 can be formed by molding the master 6 (japanese style りす る). The reverse mold 7 can be obtained by, for example, casting silicone resin onto the surface portion of the master mold 6 and curing it, followed by releasing it from the master mold 6.
As shown in fig. 3, the master mold 1 can be formed by further inverting the inversion mold 7. The master mold 1 can be obtained by, for example, casting and curing a resin different from the resin forming the inverted mold 7, and then demolding from the inverted mold 7. The outer shape of the master mold 1 thus formed is substantially the same as the outer shape of the master mold 6.
Next, a method for producing a breathable mold from the master mold 1 by electroforming will be described with reference to fig. 4 to 8. As shown in fig. 4, a conductive layer 2 is formed on the surface of the master model 1. Since the conductive layer 2 is formed to have a substantially uniform thickness, the surface shape of the master model 1 (including the fine concave-convex pattern such as the leather pattern described above in addition to the concave-convex shape) appears on the surface of the conductive layer 2 as it is. The conductive layer 2 can be formed by, for example, wet electroless plating, dry vacuum plating, or the like, in addition to coating or spraying by spraying. As a material constituting the conductive layer 2, a material having conductivity, for example, gold, silver, copper, nickel, graphite, or the like can be used, but it is preferably made of silver. This is because silver has high conductivity and can be electroformed efficiently and accurately. It is preferable to clean the master model 1 in advance before forming the conductive layer 2. This is to prevent dirt particles and the like on the surface of the master model 1 from affecting the shape of the surface of the conductive layer 2.
Next, as shown in fig. 5, many fine particles 3 are ejected from the ejection port 10a of the ejection device 10 and collide with the surface of the conductive layer 2. The ejection device 10 can eject the fine particles 3 by, for example, air pressure or water pressure. As shown in fig. 6, when the fine particles 3 collide with the conductive layer 2, the release sheet 2b is peeled off from the conductive layer 2, and fine holes 2a penetrating the surface of the master mold 1 are formed in the conductive layer 2. Here, it is preferable that the ejection port 10a is moved from above the conductive layer over the entire conductive layer, so that the ejected fine particles 3 collide with the entire surface of the conductive layer 2. This is because, when the fine holes 2a are formed over the entire conductive layer 2, the air-permeable mold is also formed with through holes over the entire surface, and therefore the air-permeable mold is easily sucked uniformly over the entire surface, and the transferability from the air-permeable mold to the resin molded article is improved.
As a material constituting the fine particles 3, for example, stainless steel, copper, ceramic, glass, silica sand, or the like can be used, but a material harder than the material constituting the conductive layer 2 is preferable. This is because the peeling sheet 2b can be reliably peeled off from the conductive layer 2 at the position where the fine particles 3 collide with each other by making the material constituting the fine particles 3 harder than the material of the conductive layer 2.
The shape of the fine particles 3 may be any shape, but is preferably spherical. If the shape is spherical, the fine particles 3 collide with the surface of the conductive layer 2 in the same manner all the time, and thus the size and shape of the fine pores 2a formed in the conductive layer 2 are also easily constant. The outer diameter of the fine particles 3 may be any size as long as the conductive layer 2 can be peeled off, but is preferably 15 to 30 times the thickness of the conductive layer 2. When the outer diameter of the fine particles 3 is less than 15 times the film thickness, it may be difficult to reliably peel off the conductive layer 2. When the outer diameter of the fine particles 3 is more than 30 times the film thickness, the conductive layer 2 may be excessively peeled off, and the electroforming may not be sufficiently performed.
The position at which the fine particles 3 are ejected and the speed at which the fine particles 3 are ejected may be appropriately adjusted so that the conductive layer 2 does not peel off excessively and the fine holes 2a having a desired size cannot be formed, or so that the conductive layer 2 does not peel off even when the fine particles 3 collide with the conductive layer 2.
Next, as shown in fig. 7, the master mold 1 on which the conductive layer 2 is formed is immersed in the electroforming solution 4. The electroforming solution 4 may be a conventionally used electroforming solution, and may be used depending on the type of metal to be laminated on the surface of the conductive layer 2 by electroforming. Specifically, an electroforming solution containing ions of the metal to be laminated is used.
Examples of the electroforming solution that can be used as the electroforming solution 4 include, for example, when copper is laminated by electroforming, an electroforming solution containing copper ions, such as a copper cyanide electroforming solution, a copper pyrophosphate electroforming solution, and a copper sulfate electroforming solution. When electroforming nickel, an electroforming solution containing nickel ions, such as a nickel sulfamate electroforming solution or a nickel sulfate electroforming solution, can be used. When electroforming of chromium is performed, an electroforming solution containing chromium ions such as a hexavalent chromium electroforming solution can be cited. When electroforming zinc, an electroforming solution containing zinc ions, such as a zinc cyanide electroforming solution or a zinc cyanide-free electroforming solution, can be used. When electroforming tin, an electroforming solution containing tin ions, such as an alkaline tin electroforming solution or an acidic tin electroforming solution, can be used.
The copper cyanide electrocasting solution is, for example, an electrocasting solution containing cuprous cyanide and sodium cyanide, and the pH of the electrocasting solution can be 11 to 12. The copper pyrophosphate electroforming solution is, for example, an electroforming solution containing copper pyrophosphate, pyrophosphoric acid, and ammonia water, and an electroforming solution having a pH of 8.2 to 8.8 can be used. As the copper sulfate electroforming solution, for example, an electroforming solution containing copper sulfate and sulfuric acid can be used. The nickel sulfamate electroforming solution is, for example, an electroforming solution containing nickel sulfamate, nickel chloride and boric acid, and an electroforming solution having a pH of 3.0 to 4.0 can be used. The nickel sulfate electroforming solution is, for example, an electroforming solution containing nickel sulfate, nickel chloride and hydrochloric acid, and an electroforming solution having a pH of 4.0 to 5.5 can be used. As the hexavalent chromium electroforming solution, for example, an electroforming solution containing chromic anhydride or sulfuric acid can be used. As the zinc cyanide electroforming solution, for example, an electroforming solution containing zinc cyanide, zinc chloride, and sodium cyanide can be used. The zinc cyanide-free electroforming solution may be, for example, an electroforming solution containing zinc chloride and sodium hydroxide, and the pH of the electroforming solution may be 4.5 to 5.5. As the alkaline tin electroforming solution, for example, an electroforming solution containing sodium stannate and sodium hydroxide can be used. As the acidic tin electroforming solution, for example, an electroforming solution containing stannous sulfate or sulfuric acid can be used.
However, as the electrocasting solution 4, an electrocasting solution containing no surfactant such as sodium lauryl sulfate or the like is used. This is because, when the surfactant is contained, hydrogen generated on the surface of the conductive layer 2 is peeled off from the surface of the conductive layer 2, and the through-hole is not formed at all in the formed mold.
As shown in fig. 7, the conductive layer 2 of the master model 1 immersed in the electroforming solution 4 is connected to an electrode 12 containing a predetermined metal (for example, copper, nickel, chromium, zinc, tin, or the like) to be laminated on the surface of the conductive layer 2, by a dc power supply 13. As a result, the metal constituting the electrode 12 is eluted from the electrode 12 as an anode as metal ions (for example, copper ions, nickel ions, chromium ions, zinc ions, tin ions, and cobalt ions) into the electroforming solution. A part of the metal ions or a part of the metal ions dissolved in the electroforming solution 4 is electrodeposited on the surface of the conductive layer 2 serving as a cathode, and is laminated as a metal layer. The metal layers are laminated to form the air-permeable mold 5 (see fig. 8).
As shown in fig. 8, minute holes 2a are formed at a plurality of positions of the conductive layer 2. During electroforming, bubbles of hydrogen gas are generated on the surface of the conductive layer 2 by electrolysis. Since the electroforming solution 4 does not contain a surfactant, bubbles of hydrogen gas do not peel off from the surface of the conductive layer 2, and tend to concentrate in the minute holes 2a exposing the master model. Therefore, electrodeposition does not occur above the minute hole 2a, and even if electroforming is continued, metal is not laminated above the minute hole 2 a. Therefore, when electroforming is performed on the surface of the conductive layer 2, the through-holes 5a are formed in the portions of the breathable mold 5 to be formed, which correspond to the minute holes 2 a.
In the present embodiment, the minute holes 2a are formed over the entire conductive layer 2. Therefore, the through holes 5a formed in the air-permeable mold 5 are also formed over the entire air-permeable mold 5. With this air-permeable mold 5, suction can be performed through the entire air-permeable mold 5, so that the entire molded article of the air-permeable mold 5 can be uniformly sucked, and the target surface shape or the target pattern can be accurately transferred to the molded article.
(embodiment mode 2)
Embodiment 2 will be described below. Embodiment 1 is a method for manufacturing an air-permeable mold, but the manufacturing method can also be applied to the metal molding jig for Fiber Reinforced Plastic (FRP) molding of embodiment 2. The manufacturing method of the metal molding jig for fiber reinforced plastic molding is basically the same as the manufacturing method of the air-permeable mold according to embodiment 1. The metal molding jig for fiber reinforced plastic molding (hereinafter, also simply referred to as "metal molding jig") manufactured by the method of embodiment 2 will be described below.
In conventional fiber reinforced plastic molding, for example, a sheet-like member is first prepared in a state before reinforcing fibers such as carbon fibers are cured in a resin-impregnated state. Such a sheet-like member is generally called a prepreg resin sheet. Next, a molding jig in the shape of an inversion mold of the target shape of the fiber reinforced plastic is prepared. The prepreg sheet is placed on the molding jig. A molding jig on which a prepreg sheet is placed in a bag-shaped vacuum bag, and the vacuum bag is depressurized. Then, the vacuum bag is tightly attached to the forming jig, and the prepreg sheet is pressed against the forming jig. Then, the molding jig wrapped by the vacuum bag is placed in an autoclave in a state of being in close contact with the prepreg resin sheet, and is pressurized and heated to be cured, whereby a fiber reinforced plastic having a desired shape can be formed.
However, when such a molding jig is used, the shape of the prepreg sheet is determined by reducing the pressure in the vacuum bag and bringing the vacuum bag into close contact with the molding jig. Namely, the prepreg sheet is adhered to the molding jig by the difference between the internal pressure of the vacuum bag and the atmospheric pressure. Therefore, the prepreg sheet is adhered to the molding jig only under a pressure of atmospheric pressure or less, and there is a concern that it is difficult to completely conform the prepreg sheet to the outer shape of the molding jig. Therefore, for example, when the outer shape of the molding jig is complicated or the outer shape of the molding jig is fine, there is a possibility that the fiber reinforced plastic cannot be accurately transferred to the target shape. In addition, when the external shape of the molding jig is transferred to the prepreg sheet as accurately as possible, if a method of directly adhering the entire prepreg sheet in the thickness direction is adopted, it can be expected that the prepreg sheet more accurately follows the external shape.
Here, as shown in fig. 9, a metal molding jig 8 for fiber reinforced plastic molding manufactured by the manufacturing method of embodiment 2 is provided with fine through holes 8a throughout the entire metal molding jig (fig. 9 and 10 are schematic views, and therefore, the through holes 8a are formed to be small and small enough to be difficult to see at a glance, although they are large in appearance). As shown in fig. 10, the metal molding jig 8 is covered with the prepreg sheet 15, and suction is performed from the through hole, so that the prepreg sheet 15 can be brought into close contact with the metal molding jig (see arrow a in fig. 10).
Thus, the prepreg sheet 15 can be brought into close contact with the molding jig more strongly (pressure equal to or higher than atmospheric pressure) than when the molding jig on which the prepreg sheet is placed in a vacuum bag and reduced in pressure. Therefore, the external shape of the metal forming jig 8 can be transferred to the prepreg sheet 15 more accurately, and the accuracy of forming the reinforced plastic is also improved. Further, since the metal molding jig 8 is sucked in the thickness direction of the prepreg sheet 15 through the through-holes 8a, the external shape of the metal molding jig 8 is easily transferred to the prepreg sheet 15 more accurately. Further, since the through-hole 8a is a minute hole, the outer shape of the metal forming jig 8 is not affected. Therefore, the external shape of the metal forming jig 8 is not prevented from being accurately transferred to the prepreg sheet 15.
In addition, the metal forming jig 8 manufactured by the manufacturing method of embodiment 2 is provided with fine through holes 8a throughout the entire surface thereof. Therefore, the entire prepreg sheet 15 can be uniformly sucked, and therefore the external shape of the metal forming jig 8 is less likely to be transferred to the shape of the prepreg sheet 15 with uneven depth. That is, even if different metal molding tools 8 are used, the shape transferred to the prepreg sheet 15 is less likely to fluctuate.
The suction force can be adjusted according to the amount and speed of the air sucked from the through-hole 8 a. Therefore, the prepreg sheet 15 can be molded in accordance with the softness and strength of the prepreg sheet 15.
In addition, the prepreg sheet 15 is cured in an autoclave capable of being pressurized and heated in a state where the prepreg sheet 15 is adsorbed to the metal molding jig 8, whereby a fiber reinforced plastic molded into a desired shape can be obtained.
(other embodiments)
The present invention is not limited to embodiments 1 and 2 described above with reference to the drawings, and various modifications, additions, and deletions can be made within the scope not changing the gist of the present invention. The metal porous molded article produced by the production method of the present invention can also be applied to a method for producing a member such as a vacuum chuck that sucks and moves a workpiece by suction from a through hole.
The method for producing the master mold is not limited to the method described in the embodiment. Examples of the method include a method of producing the surface of the target substrate by machining, a method of applying a photosensitive resin to the surface of the polished substrate, and irradiating the surface with light to transfer a pattern or shape of the resin to the surface of the substrate, and other physical or chemical etching methods.
The shape of the master model is not limited to the illustrated shape, and may be various shapes corresponding to the target shape.
In the above embodiment, a large number of fine particles 3 are injected at once by the injection device 10, but the fine particles 3 may be injected one by one. Further, as the means for injecting fine particles, for example, a means for physically ejecting particles by bounce may be used instead of the injection means using air pressure.

Claims (7)

1. A method for producing a porous metal molded article, wherein,
the method for producing a porous metal molded article comprises:
a step 1 of causing fine particles to collide with a surface of a conductive layer formed on a surface of the master mold for a metal porous molded article to peel off the conductive layer at a position where the fine particles collide with the surface of the master mold, thereby forming fine holes penetrating the surface of the master mold in the conductive layer; and
and a step 2 of immersing the master model in an electroforming solution not containing a surfactant to perform electroforming on the surface of the conductive layer.
2. The method for producing a metal porous molded article according to claim 1, wherein,
the 1 st step is a step of: and an ejection device for ejecting a plurality of the fine particles from an ejection port, wherein the ejection port is moved while being spaced apart from the conductive layer by a predetermined distance, and the plurality of the fine particles are ejected from the ejection port and collide with the entire surface of the conductive layer, thereby forming the fine holes over the entire conductive layer.
3. The method for producing a metal porous molded article according to claim 1 or 2, wherein,
the fine particles are made of a material harder than a material constituting the conductive layer.
4. The method for producing a metal porous molded article according to any one of claims 1 to 3, wherein,
the material constituting the conductive layer is silver.
5. The method for producing a metal porous molded article according to any one of claims 1 to 4, wherein,
the fine particles are spherical, and the outer diameter of the fine particles is 15 to 30 times the thickness of the conductive layer.
6. The method for producing a metal porous molded article according to any one of claims 1 to 5, wherein,
the porous metal molding is an air-permeable mold.
7. The method for producing a metal porous molded article according to any one of claims 1 to 5, wherein,
the metal porous molded article is a metal molding jig for molding a fiber-reinforced plastic.
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