KR102244334B1 - A mold with different metal for manufacturing combustible cartridge case - Google Patents

Abstract

The present invention relates to a lower mold of a molding machine for producing burnout casings to which different metals are applied, and improves drying characteristics and work efficiency by including fine perforations and metals of different characteristics in a mold including an outer shape part and a bottom plane part in a molding process. There is an effect of letting go.

Description

{A mold with different metal for manufacturing combustible cartridge case}

The present invention relates to a lower mold of a molding machine for producing burnout casings to which different metals are applied, and more specifically, the mold is a lower mold of the molding machine, and has an outer shape part and a bottom plane part made of different metals, and the floor It relates to a lower mold of a molding machine for manufacturing exhaust casings using different metals, characterized in that by forming perforations of fine holes having a size of 0.1 mm to 3.0 mm on a flat portion, improving drying characteristics and working efficiency of exhaust casings.

The burnout cartridge case (= burnout container, CCC, combustible cartridge case) is a product that replaces the medicine gun or metal cartridge case that has been used in military weapons. Nitrocellulose (NC), which is the main component, burns, giving additional propulsion energy to the bullet. It refers to a casing that has the characteristic of completely burning after firing a bullet.

The burnout casing dissociates nitrocellulose that gives energy and pulp that reinforces strength, and then mixes them in a mixer containing water together with resin that bonds them, and dehydrates them on a three-dimensional wire mesh to form a desired shape. It is produced by going through a felting process of temporary molding the burnout casing, followed by a molding process in which the burnout casings temporarily molded in the felting process are heated and pressed at a high temperature to finally dry them.

In Korean Patent Publication No. 1996-0004228, in order to provide a combustible casing, the slurry in which the constituent materials are mixed is put into a compression mold consisting of male and female molds and a hydraulic press, and treated with steam, vacuum, and high temperature to provide the slurry in wet felt state. It discloses a combustible casing that is completely burned and extinguished through a method of simultaneously compressing and drying the material, but it uses a mold to which the conventional technology is applied to a mold that simultaneously compresses and dries by putting slurry, and Korean Patent Publication No. 90-002150 , As disclosed in Publication Patent No. 90-001344 and Publication No. 10-2004-0073822, in the related art, corrosion resistance, workability, and As a metal such as aluminum having high thermal conductivity was applied, it was necessary to improve the dimensional safety and at the same time supplement the drying treatment of the product through excellent thermal conductivity characteristics.

As described above, in the usual felting process or molding process, when the exhausted casings are not completely dried, the strength of the exhausted casings becomes relatively weak, and the possibility of product damage during work or use increases. Along with runnability and workability, it greatly affects the quality of the part.

In addition, Japanese Patent Laid-Open Publication No. 2005-111700 on a mold for injection molding of plastic molded products is a mold for injection molding that combines a plurality of materials having different thermal conductivity and strength. Although a method for improving the shape and dimensional accuracy of the stiffener has been disclosed, such heat treatment did not efficiently dry the moisture of the slurry, and there was room for improvement in cost and efficiency due to a complex mold structure.

Accordingly, in order to increase the strength of the exhaust casing, the moisture contained between the fibers of the exhaust casing is efficiently dried, and the shape and dimensions of the exhaust casing are not changed even during the repeated exhaust casing process. A method was devised to improve cost and work efficiency.

Korean Patent Publication No. 10-1996-0004228 (1996.03.28) Japanese Unexamined Patent Application Publication No. 2005-111700 (2005.04.28.) Republic of Korea Publication Patent No. 1990-002150 (1990.04.02.) Republic of Korea Publication Patent No. 1990-001344 (1990.03.08.) Republic of Korea Patent Publication No. 10-2004-0073822 (2004.08.21.)

Therefore, the technical problem to be solved by the present invention is when manufacturing burnout casings including nitrocellulose (NC) fibers and Softwood Bleached Kraft Pulp (SwBKP), the outer shape part 122 and the bottom plane part ( 121), wherein the bottom flat portion has a fine hole having a size of 0.1 mm to 3.0 mm, and the outer shape portion is made of a first metal portion having excellent characteristics of dimensional safety and mechanical strength, and excellent thermal conductivity and workability. Molding machine for producing exhaust casings using different metals, characterized in that by manufacturing the mold, which is a lower mold of a molding machine in which the bottom plane portion is combined with the second metal portion having characteristics, the drying characteristics and work efficiency of exhaust casings are improved. Its purpose is to provide the lower mold of the.

Another object of the present invention is to provide a method of finally forming a molded article with a microstructure of nylon fiber mesh or a metal mesh made of stainless steel using the above mold.

According to a feature of the present invention for achieving the above object, the present invention applies a method of using different metals to the outer shape portion 122 and the bottom plane portion 121, respectively. It relates to a lower mold of a molding machine for producing casings.

In the case of the outer shape part 122, stainless metal (SUS, etc.) instead of aluminum that is generally applied, chromium molybdenum steel (KP4, etc.) as plastic mold steel, nickel chromium molybdenum steel (KP4M, etc.), Ni-Al-Cu-based Mold steel (NAK 80, etc.), Ni-Al-Cu mold steel (NAK 55, etc.), mechanical structural carbon steel (KP1, etc.), new steel type high alloy steel (ASSAB718, etc.), chrome alloy stainless steel mold (STAVAX, etc.), copper alloy mold By applying any one selected from steel (HR750, etc.) or alloy tool steel (SKD11, SKD 61, etc.) as the first metal part to the outer shape part 122, the thermal deformation is extremely lower than that of the aluminum, and the mechanical strength is high. Product dimensional stability can be achieved.

In the case of the bottom flat portion 121, copper alone or copper alloy steel as a second metal portion is applied to the bottom flat portion 121, and in the case of the copper alloy steel, bronze, brass, nickel brass, manganese brass, phosphor bronze, There may be budding, delta metal, naval brass, monel metal, cupronickel, etc., and it is a copper alloy-based material with such a high thermal conductivity compared to existing aluminum and other metals, and it can improve drying characteristics by removing moisture contained in the product. have.

By perforating a hole 123 with a diameter of 0.1mm to 3.0mm in the bottom flat part 121, water vapor generated during drying of the product in the final molding of the product can be removed, and the product can be quickly dried, demolded, and shaped. And dimensional stability and drying characteristics can be increased.

The mold of the present invention is a lower mold of a molding machine used in the molding process of the burnout casing, and the outer shape part 122 of the mold is made of a first metal part having excellent characteristics of dimensional safety and mechanical strength, and is felt. A molding space for inserting the temporary molded body of the burnout casing is included in the center of the outer shape part 122, and the molding space follows the shape of the burnout casing product, and the bottom of the molding space of the outer shape part 122 The surface is opened into an empty space in order to physically couple the bottom plane portion 121 to be positioned.

The bottom flat portion 121 is a bottom surface of the molding space in which the felt-treated temporary molded body 110 is inserted among the outer shape portions 122, and the bottom flat portion 121 of the mold has thermal conductivity and workability. It consists of a second metal part having this excellent feature, follows the shape of the final product, and is inserted and positioned on the bottom surface of the molding space among the outer shape parts 121, and is physically interposed with the outer shape part 122. Combined with an interference fit.

The thickness of the bottom flat portion 121 is not particularly limited as long as the thermal conductivity does not decrease.

The bottom plane portion 121 has holes 123, and the number of the bottom plane portions 121 is not particularly limited. In addition, only the bottom flat portion 121 can be separated from the mold of the present invention.

In the method of manufacturing a burnout casing using the mold of the present invention, nitrocellulose (NC) is added to and mixed with the beaten coniferous kraft pulp (SwBKP), and then resin and/or an additive of a water resistance enhancer is added and 1 step of mixing;

A second step of diluting the mixture of step 1 to 0.2% to 10%, and adding an antifoaming agent and a degassing agent;

A third step of putting the mixture 100 of the second step into a felting process and performing temporary molding;

A fourth step of final molding by putting the felt temporary molded body 110 of the three steps into the molding process mold of the present invention; And

It includes 5 steps of assembling and drying the molded body of step 4 to complete.

In the first step, the nitrocellulose fibers have an average fiber length of 1.0 to 5.0 mm, an average fiber width of 5.0 to 50.0 µm, and a beating state of 1.0 to 500 ml CSF, and the beaten Softwood kraft pulp uses a beating state with an average fiber length of 1.0 to 5.0 mm, an average fiber width of 5.0 to 50.0 µm, and a porosity of 1.0 to 1,000 ml CSF.

The submerged kraft pulp is mixed with water in 5 to 50% based on the weight of the final slurry solid content, and completely dissociated using a high-speed rotating blade of a dissociator to increase the specific surface area of the fiber, and nitro Cellulose is added in 50 to 90% based on the weight of the final slurry solids of the brine kraft pulp and mixed uniformly.

The fiber lengths of the nitrocellulose fibers and kraft pulp are different from each other in fiber lengths, thereby increasing the filling density in the final slurry solid content, and further improving the mechanical strength of the final product.

The resin of the first step is a compound of Table 1 instead of a single polymer system such as CMC (carboxymethyl cellulose), a natural polymer such as starch, and a single polymer system such as PAM (polyacrylamide), which are generally used to increase the strength of paper. Combining empty spaces between fibers that are bonded as the polymer layer adsorbed on the fiber surface is thickened through a single or dual-polymer system using species or a polymer system using two or more of the above polymers. It becomes easy, and it can be used by continuously increasing the amount of input (i.e., the amount of adsorption on the fiber surface) by appropriately adjusting the charge density and amount of the two polymers, and in a single polymer system using natural polymers such as CMC and starch, or PAM It is possible to overcome the charge reversal phenomenon and the limit of the amount of addition on the fiber surface that occurs when an excessive amount of the same cationic polymer is added.

The resin includes polyamideamine-epichlorohydrin (PAE), which is a cationic polymer, micropolymer (MP), which is an anionic polymer used as a retention enhancer in the paper industry, and polyurethane (PU) having anionic, cationic, or nonionic properties. ), but nonionic polyurethane or nonionic but polyvinyl alcohol (PVA) and polyvinyl acetate (PVAc), which may have weakly anionic properties through contact with cationic substances, are used in the combination of the ionic polymer compound. Although it can be added and used, if it is a combination of a polymer having a cationic property and a polymer having an anionic property, it can be used as the resin of the present invention.

In the present invention, the resin is mixed or externally added to the nitrocellulose and kraft pulp mixture, and at the time of mixing, simple mixing, cationic, anionic, and nonionic polymers are sequentially added to the nitrocellulose and kraft pulp mixture, or , In the mixture, a composite prepared by premixing two or more polymers including the anionic polymer and the cationic polymer may be added, thereby improving the wet strength and drying strength of the burnout casing composed of the NC-SwBKP. I can make it.

The micropolymers are organic microparticles, which are prepared by modifying PAMs having a mostly linear structure by attaching a hydrophobic functional group, and such as a polymer constituting acrylamide or a water-soluble anionic copolymer of acrylamide and acrylic acid. , As meaning charged organic polymer microbeads or organic microparticles having a highly structured three-dimensional network structure of about 50 nm size, the MP of the present invention is As in US 8308902 B2, Christopher Lewis and Marco Polverari (2008) and Dan S.Honig et al. (2000), which disclose methods of using MPs with ionicity, most of them activate intermolecular interactions in PAMs having a linear structure. Anionic organic polymer of a three-dimensional structure that has ionicity by attaching and modifying a hydrophobic functional group to be modified was used, and accordingly, it is very effective in retaining clay and calcium carbonate, has a small molecular weight, and has a low charge density. It is high enough to form small aggregates and adsorb to the fibers.

A composite in which the resin is simply mixed in a mixture of beating coniferous kraft pulp and the nitrocellulose, or a cationic polymer and an anionic polymer as resin are sequentially added, or the cationic polymer and anionic polymer are premixed Can be injected as.

The resin is added to the uniformly mixed NC-SwBKP slurry alone, or two or more materials are mixed and added to 0.2 to 15% based on the weight of the uniformly mixed NC-SwBKP slurry solids, and uniformly mixed on the surface of the fiber. Can be applied.

Examples of the water resistance enhancer (water resistance) include rosin, alum, alkyl ketene dimers (AKD, Alkyl Ketene dimers), alkenyl succinic anhydride (ASA), CaCO ₃ , silicone, starch, methyl Cellulose (MC, methyl cellulose), carboxymethyl cellulose (CMC), carboxy cellulose (CC), polyacrylamide (PAM), styrene-acrylic acid-cationic monomer (Stylene-acrylate-cationic) monomer), or a fluorine-based resin.

When the water-resistance enhancer (water-resistance agent) is manufactured, it is mixed with raw materials and then surface-treated after product molding, and the exhausted casing composed of NC-SwBKP is changed from hydrophilic to hydrophobic. Be resistant to.

Methods of surface treatment on the outside may include methods such as impregnation, spraying, and coating.

In the second step, before the mixture is felt, an antifoaming agent or a degassing agent as an additive may be added to the mixture of step 1 diluted with an excess of water to a concentration within 0.2 to 10%, and the molding time according to the diluted concentration You can adjust the final weight of the product by adjusting.

The third step is to felt the mixture of the second step, as a material containing nylon (nylon) nylon 6, nylon 11, nylon 12, nylon 46, nylon 66, nylon 610, nylon 612, nylon-MXD 6, nylon It is felt with a nylon mesh selected from a copolymer and a transparent nylon resin or a stainless steel metal mesh having an opening size of 0.1 μm to 100 μm.

In the fourth step, the temporary molded body felt in the third step is inserted into the mold of the present invention and subjected to a molding process to perform final molding.

In the 5th step, the molded body is assembled, and then, if necessary, a water-resistance enhancer is additionally treated.The method includes completely immersing the molded body in a water-resistance enhancer and drying or curing it after surface application, or There is a method of applying it by placing it in a vacuum chamber, putting a water resistance increasing agent in a tank connected to the chamber, and injecting a water resistance increasing agent into the vacuum chamber. It may be applied by putting it first, or it may be applied to the surface of the final product after manufacturing the final product.

In the case of using the nylon mesh in the fourth step, the size of the scale is smaller than that of the metal mesh, so that even short fibers can be formed, and the weight of the product molded body due to bonding is not necessary because bonding by welding the mesh to the felting mold is not required. By minimizing the deviation, the weight of the product can be manufactured evenly.

In addition, since the weight of the final product is determined, a post-treatment process corresponding to the final stage such as trimming (cutting process) is performed by applying a mold matching the dimensions of the product in the molding process of the 5th step. By omitting it, it is possible to increase the manufacturing cost and work efficiency according to the reduction of the manufacturing process.

Therefore, the lower mold of the molding machine for producing exhaust casings using different metals of the present invention according to the above-described problem solving means has the effect of improving drying characteristics by perforation and copper alloy, and improving efficiency in repetitive manufacturing processes.

1 is a schematic view of a lower mold of a molding machine for manufacturing burnout casings to which different metals of the present invention are applied.
Figure 2 is a schematic process diagram of the exhaust cartridge manufacturing method of the present invention.
Figure 3 is a schematic partial enlarged view of the felting equipment of the present invention.
Figure 4 is a schematic cross-sectional view of the felting equipment of the present invention.
5 is a flow chart for a molding process using the mold of the present invention.
6 is a flow chart for a molding process using a conventional mold.
7 is a perspective view of an exhaust cartridge manufactured using the mold of the present invention.

As described above, the present invention is to manufacture exhaust casings using a mold for manufacturing exhaust casings to which different metals are applied, and specific details for carrying out the present invention will be described as follows, but the scope of the present invention is limited thereto. It is not, and units are based on weight unless otherwise indicated.

In the method of manufacturing a burnout casing using the mold of the present invention, in one step, nitrocellulose (NC) is added and mixed in the beaten coniferous kraft pulp (SwBKP), and then the resin and/or the water resistance enhancer Additives are added to the mixture and mixed.

As the pulp of the present invention, coniferous kraft pulp (SwBKP, made in Canada) and nitrocellulose (NC) fibers are mixed, first in a standard disintegrator (Pulp disintegrator, L & W, Sweden) based on the weight of the final slurry solids, the kraft pulp Mix with water to make 20-30% and 67-77% nitrocellulose and dissociate for 10 minutes, respectively.

The dissociated coniferous kraft pulp has an average fiber length of 1.0 to 5.0 mm and an average fiber width of 5.0 to 50.0 µm, and is beaten for 30 minutes at 1% concentration through a Valley beater, and Yeosu is 440 to 460 mL. The dissociated nitrocellulose fibers having an average fiber length of 1.0 to 5.0 mm and an average fiber width of 5.0 to 50.0 µm were beaten and beaten by CSF, and the stiffness was 1.0 It was used to create a beating state of ~500ml CSF.

Thereafter, the beaten coniferous kraft pulp and nitrocellulose were mixed in a ratio of 20:80, and the stock concentration was adjusted to 0.5%.

The fiber lengths of the nitrocellulose fibers and kraft pulp are different from each other in fiber lengths, thereby increasing the filling density in the final slurry solid content, and further improving the mechanical strength of the final product.

The resin is a polymer adsorbed on the fiber surface through a single- or dual-polymer system using one or two polymers of Table 1 instead of a single polymer system, or a polymer system using two or more of the polymers. As the layer becomes thicker, the empty space between the fibers to be bonded is reduced to make it easier to bond, and by appropriately adjusting the charge density and input amount between polymers, the input amount (i.e., the amount of adsorption to the fiber surface) can be continuously increased and used. In a single polymer system, it is possible to overcome the charge reversal phenomenon and the addition amount limit on the fiber surface that occurs when an excessive amount of one cationic polymer is added.

Such resins include polyamideamine-epichlorohydrin (PAE), which is a cationic polymer, micropolymer (MP), which is an anionic polymer used as a retention enhancer in the paper industry, polyurethane having anionic, cationic, or nonionic properties. (PU) is used, but nonionic polyurethane or nonionic but polyvinyl alcohol (PVA) and polyvinyl acetate (PVAc), which can have weakly anionic properties through contact with cationic substances, are used in the ionic polymer compound. It can be used by adding it to the combination, but if it is a combination of the above polymers, it can be used as the resin of the present invention.

With at least one selected from PAE, a cationic polymer, polyvinyl alcohol (PVA), micropolymer, polyvinyl acetate (PVAc), and polyurethane (PU), which are also used as retention enhancers, in the nitrocellulose and kraft pulp mixture Mixing or adding externally, at the time of mixing, simple mixing, or sequentially adding the polymers to the nitrocellulose and kraft pulp mixture, or premixing the two or more polymers into the mixture to be introduced into a composite prepared Through this, it is possible to improve the wet strength and dry strength of the exhausted casing composed of the NC-SwBKP.

The resin may be applied to the surface of the fiber by mixing it with a uniformly mixed NC-SwBKP slurry, adding 0.5 to 1.5% based on the weight of the uniformly mixed NC-SwBKP slurry solid, and mixing uniformly.

Examples of the water resistance enhancer (water resistance) include rosin, alum, alkyl ketene dimers (AKD, Alkyl Ketene dimers), alkenyl succinic anhydride (ASA), CaCO ₃ , silicone, starch, methyl Cellulose (MC, methyl cellulose), carboxymethyl cellulose (CMC), carboxy cellulose (CC), polyacrylamide (PAM), styrene-acrylic acid-cationic monomer (Stylene-acrylate-cationic) monomer), or a fluorine-based resin.

When the water-resistance enhancer (water-resistance agent) is manufactured, it is mixed with raw materials and then surface-treated after product molding, and the exhausted casing composed of NC-SwBKP is changed from hydrophilic to hydrophobic. It can be made to have resistance, and 0.5 to 1.5% can be added based on the weight of the final slurry solid content.

Methods of surface treatment on the outside may include methods such as impregnation, spraying, and coating.

In the second step of the present invention, the mixture mixed in the first step is diluted to 0.2 to 10% by weight, air bubbles are removed from the diluted mixture, and an antifoaming agent and a degassing agent that affect dehydration and drying of the product are added.

As an additive, the antifoaming agent or the degassing agent may be added to the mixture of step 1 diluted with excess water at a concentration of 0.7 to 1.3% by weight based on the weight of the final slurry solid content, and the molding time according to the diluted concentration To adjust the final weight of the product.

In the third step of the present invention, as a primary molding in which the weight-adjusted mixture 100 of the second step is put into the felting process and felt, nylon 6, nylon 11, nylon 12, nylon as a material containing nylon 46, nylon 66, nylon 610, nylon 612, nylon-MXD 6, a nylon mesh selected from nylon copolymer and transparent nylon resin, or stainless steel having an opening size of 0.1㎛ to 100㎛ ) Felt treatment with a metal mesh made of material.

The nylon mesh is a resilient material such as a general stocking, so it can be forcibly fitted to fit the shape by covering the frame or surface of the felting mold, but if the mold mesh made of a conventional stainless steel (SUS) material is applied, it is fixed to the shape. It becomes difficult, and a separate operation of welding and fixing the mesh is required.

The mesh 102 has a maximum fiber width of 50.0 µm of the fibers included in the mixture to be fed into the felting process, so if the pores of the mesh are too large, excessive fibers will escape through the pores, resulting in increased product loss as well as product loss. If the mesh size is too small, the vacuum capacity decreases in adsorbing the fibers evenly on the nylon surface while removing the moisture from the bottom of the mesh by vacuuming the slurry diluted in water, so that the required quantity is adsorbed. It becomes difficult, and non-uniformity can be caused.

The felting treatment is to perform temporary molding by injecting the raw material mixture (slurry, 100) of the second step into the felting equipment to be used and adsorbing it to the nylon or metal mesh 102, and at this time, the slurry 100 in the tank 104 is uniform. It must be distributed in an intaglio or embossed manner, and induce a local vacuum state on the felting mold by suction 105 under the felting mold (inside the felting equipment) installed in an intaglio or relief, and a vacuum in which air is sucked from the felting mold. By fixing a nylon mesh (102) on the outer surface of the felting mold on the opposite side of the direction, a certain amount of slurry is adsorbed to the nylon mesh using a vacuum state according to the infiltration, and the product is temporarily molded (felting treatment) ([ Fig. 3], [Fig. 4]).

In the fourth step of the present invention, the felt-treated temporary molded body 110 is inserted into the mold of the present invention for a molding process, and the final molding (molding treatment) is performed. A schematic view of the molding process of the fourth step is shown in FIG. 5.

Specifically, the felting-treated false molded body 110 is moved to the molding presses 111 and 112, and the felting mold 101 is in the felting mold 101 that is intaglio or embossed. As it moves along, the slurry 100 is temporarily molded in the shape of the product.

In a molding press for a molding process using a conventional mold, as shown in FIG. 6, in general, the molding molds 114 and 115 are connected to the upper part 111 and the lower part 112 of the press, respectively, and a heat source in the molding mold connected to the upper and lower parts of the press ( Thermocouple, hot oil, steam, hot water, etc.), air, and vacuum are used to form the final product.

In the general molding treatment as described above, first, the primary molded slurry (caustic molded body) is transferred to a molding equipment, and then the false molded body moved to the molding equipment of a press supplying a heat source to the upper/lower part is pressed. At this time, the moisture and vapor contained in the slurry fibers due to high-temperature compression are removed in the vacuum direction 113 of [Fig. 6] by sucking air through holes drilled in the upper/lower parts of the molding mold respectively connected to the press.

The first molded product is molded into the final product through the second or third stage, and the thickness of the product can be reduced little by little, and if the thickness is not decreased little by little in multiple stages, the fibers will be torn during product molding.

In the case of the mold of the present invention as shown in FIG. 5, as a lower mold formed in a form in which the bottom flat portion 121 (indicated in yellow) is physically fitted to the outer shape portion 122, the felting of the outer shape portion 122 The bottom surface of the molding space in which the processed temporary molded body 110 will be located is positioned on the floor plane part 121 to physically couple with the outer shape part 122, and then the outer shape part 122 and the floor The felt-treated temporary molded body 110 is loaded into the molding space made of the flat part 121.

In the case of the external shape, stainless metal (SUS, etc.) as a first metal part instead of aluminum, chromium molybdenum steel (KP4, etc.) as a plastic mold steel, nickel chromium molybdenum steel (KP4M, etc.), Ni-Al-Cu Series mold steel (NAK 80, etc.), Ni-Al-Cu mold steel (NAK 55, etc.), mechanical structural carbon steel (KP1, etc.), new steel type high alloy steel (ASSAB718, etc.), chrome alloy stainless steel mold steel (STAVAX, etc.), copper alloy It was manufactured using any one selected from mold steel (HR750, etc.) or alloy tool steel (SKD11, SKD 61, etc.).

In the case of the bottom flat part 121, copper alone or a second metal part of copper alloy steel is applied, and in the case of the copper alloy, bronze, brass, nickel brass, manganese brass, phosphor bronze, shinjin, delta metal, naval brass, monel Any one selected from metal, cupronickel, etc. can be used, and it is a copper alloy-based material having such a high thermal conductivity compared to existing aluminum and other metals, and can improve drying properties by removing moisture contained in the product.

Existing molds used in the above molding process are mainly made of aluminum, which is because the high thermal conductivity of aluminum, corrosion resistance to water, and excellent workability can reduce the production cost a lot, but it is directly related to the drying time of the product. There is a problem in that heat loss occurs due to the use of an indirect heat transfer method such as thermocouple, heat medium oil, or steam rather than direct heat, resulting in an increase in manufacturing cost.

In addition, the existing aluminum mold has high thermal conductivity and can have excellent properties for general pulp mold products such as paper containers, but the strength of the aluminum material is weak, so it is severely deformed by external impacts, and the dimensional safety is good due to the high coefficient of thermal expansion. This increases the defect rate when manufacturing precision-sized products such as mold removal/attachment and burnout casings.

As shown in Table 2, an Al mold was used in the existing pulp mold, but in the present invention, a first metal part having a low coefficient of thermal expansion such as SUS and a high Vickers hardness, which is a mechanical strength, and a Cu-based material having excellent thermal conductivity and workability. 2 Use metal parts. The molding temperature of the product is made at a high temperature of about 140 ~ 170℃.

The Al has a large coefficient of thermal expansion, and not only has a large dimensional change during molding at a high temperature, but also has low hardness, so that deformation of the mold may easily occur due to high pressure during product molding. That is, when a product is placed between the upper and lower molds of a conventional pulp mold, and when the product is compressed and molded at a high temperature of 140 to 170°C and high pressure, the Al has low hardness and can be easily deformed. .

In order to solve such a problem, a method of using different metal types having different advantages is applied to the lower mold of the molding machine for producing burnout casings. More specifically, the mold steel is applied to the outer shape part 122 of the mold. By using, the thermal conductivity is low, the coefficient of thermal expansion is small, the mechanical strength is high, and the dimensional stability is excellent, and by applying copper or copper alloy steel having excellent workability and excellent thermal conductivity than aluminum to the bottom flat portion 121 , It has the effect of maintaining the drying characteristics of the product.

That is, in the present invention, the first metal part, such as the SUS, has a low coefficient of thermal expansion and has high hardness, so that the aforementioned dimensional change and deformation are low, and thermal properties through the second metal part of the Cu series to complement the low thermal conductivity characteristics. Was supplemented.

In addition, since the hole 123 of the bottom flat portion 121 is finer and the harder the material is applied, the worse the workability is, the more difficult it is to perforate, so by applying the second metal portion to the bottom flat portion 121, more Specifically, by applying a metal that is softer than the metal applied to the outer shape part 122, the hole 123 can be easily drilled, and through the hole 123, it occurs when the product is dried. The vapor can be quickly removed using vacuum conditions, which can greatly help improve product productivity.

In addition, by supplying air through the perforated hole 123, the molded product can be easily demolded and separated. When molding the exhaust container, fibers inevitably accumulate in the hole 123 to block or deform the hole. The possible problem is that, as different metals are applied, only the bottom flat portion 121 can be detached to be cleaned and reprocessed, so that the process can be restored to its original state in a short time.

By perforating a hole 123 with a diameter of 0.1mm to 3.0mm in the bottom flat part 121, water vapor generated during drying of the product in the final molding of the product can be removed, and the product can be quickly dried, demolded, and shaped. And dimensional stability and drying characteristics can be increased.

The hole 123 promotes drying of the product and blows air for demoulding of the product. As the size of the hole 123 is smaller than 0.1 mm, it is difficult to remove moisture from the product, resulting in a decrease in drying characteristics. Thus, manufacturing time is increased, and as the size of the hole 123 is greater than 3.0 mm, fibers are sucked through the hole during compression vacuum to block the hole or the product is torn, thereby increasing the defect rate.

In the fifth step of the present invention, the molded body is assembled, and then, if necessary, after additional treatment with a water resistance enhancer, the surface is dried and cured, and the water resistance enhancer is added to the mixture before the resin depending on the type of resin. It may be added or applied to the surface of the final product after manufacturing the final product.

As shown in Fig. 7, the final product may be removed by inhaling moisture and air through the micro-perforated holes in the mold of the molding process, so that fine spots may remain on the final product, and the propellant in the upper container 132 of the final product. By making the inlet 124 and the stopper 133, a propellant (explosives) can be injected, and the upper container 132 of the final product as a lid was manufactured to seal the propellant after the injection.

In addition, when the water resistance enhancing agent is applied to the surface, it is applied by a method generally used, and is not limited to a special method.

In the pulp mold, fibers (slurry) that has been first preformed (felting treatment) are produced in the shape required by using a mold, and the moisture contained in the fiber is supplied in the form of steam through the heat source supply and vacuum of the mold. Slurry is dried by suction, but in general, aluminum molds have high thermal expansion and contraction values, so precision molding of products is difficult. Although it is not suitable for use, an aluminum mold was used because the production cost could be greatly reduced due to its high thermal conductivity, corrosion resistance to water, and excellent workability (machining of micropores at the top and bottom).

In addition, the exhausted casing (container) should not cause problems in the product even if it is stored for a long time due to the characteristics of the product, but in the existing molding process, the thickness of the initial thick fiber (thickness because it contains moisture) is adjusted little by little in order by focusing on mass productivity. The thickness was reduced by performing a multi-stage operation, and at this time, about 3 based on the right angle of the bottom surface, such as the inclined wall surface 116 of the mold indicated by the red circular dotted line in FIG. 6 for minimizing the defect rate of the product and for convenience of transportation. A burnout casing (container) with a wall surface 116 inclined outward by ~ 6° was manufactured.

However, since the exhaust casing (container) has to assemble the upper and lower containers with adhesive, the walls of the upper and lower containers are inclined about 3 to 6 degrees from the vertical of the bottom surface, and the side that was bonded by stress during long-term storage. In addition to this fall, there is a disadvantage in that the product can be more easily opened and torn due to a vertical load, and when the upper mold 114 descends to the lower mold 115 and compresses the slurry in the molding process, the upper and lower parts Since burrs 117 are generated along the gaps between the molds, additional secondary processing of the product for removing the burrs 117 is required.

In order to solve the above problems, the mold of the present invention, for precise dimensional molding, a material having a low coefficient of thermal expansion was applied to the separated upper and lower molds, respectively, and a heat source was supplied to the upper mold 124 (air/vacuum drilling). None) was used, and in the lower mold 120, a metal material having a low coefficient of thermal expansion and high mechanical strength with excellent dimensional safety was used for the outer shape part 122, and the bottom flat part 121 In order to quickly dry during high-temperature compression and remove water vapor generated from the inside, dry the manufactured exhaust casing (container) through a lower mold that uses a copper alloy-based material that has excellent heat transfer and good workability. Was intended to promote.

Through this, in the mold of the present invention, in order to solve the above two (tilt, burr) problems, a mold having excellent dimensional stability is used, and a mold having a wall surface of 87° to 90° (right angle) from the bottom surface is made of thick fibers. The first pre-compression is performed using a jig inside, and the upper and lower molds are manufactured to be the same as the product dimensions, so that the burr (117) can be molded to prevent the occurrence of the product, thereby increasing the manufacturing efficiency. do.

Conventional molds are generally molded with a 3-6 degree gradient from the right angle of the bottom surface for molding excellence. At this time, the upper/lower molds are not completely sealed and are designed to be higher than the dimension (height) of the product. It goes up through the gap and a burr occurs. Burr generated in this way undergoes an additional secondary processing process to meet the dimensions required by the product, but the mold of the present invention can be all 84 to 90 degrees at the wall angle of the mold, and in particular, in the mold of the present invention As one that can be manufactured closer to the vertical than the angle of the wall surface of the conventional mold, more preferably, the wall surface angle of the mold of the present invention is preferably 87 to 90 degrees. In this way, when the upper and lower molds mold the fibers, the upper and lower molds exactly match the product dimensions and are completely sealed to prevent the product from rising through the gap, so that the burr does not occur. No secondary processing is required.

This is aluminum, which is a material of the conventional mold, and when the product is completely sealed, the density of the product increases, and the aluminum mold may be deformed due to the product. However, the mold of the present invention has a high strength due to the first metal part such as SUS material. It is excellent and hardly changes in dimensions, etc., and the copper material of the second metal part has a low strength, but it is possible because the strength can be increased with additives as well as the thickness of the product can be supplemented.

100: raw material slurry (mixture)
101: felting mold
102: Mesh
103: felting hole
104: felting machine tank
105: felting machine vacuum direction
110: felt-treated pseudoformed body
111: upper molding press
112: molding press lower part
113: molding machine vacuum direction
114: upper mold of a conventional molding machine
115: Lower mold of conventional molding machine
116: wall
117: Burr
120: lower mold of the molding machine of the present invention
121: floor plane portion
122: outer shape part
123: hole
124: upper mold of the molding machine of the present invention
131: lower container of the exhaust cartridge
132: upper container of the exhaust cartridge
133: propellant inlet plug
134: propellant inlet

Claims (5)

It has an outer shape part 122 made of a first metal part and a bottom flat part 121 made of a second metal part,
The bottom plane part 121 forms a bottom surface of the molding space into which the felt-treated temporary molded body 110 is inserted among the outer form parts 122, and the outer form part 122 and the bottom plane part 121 Are combined in a physical fit form,
The lower mold of the molding machine for manufacturing burnout casings to which different metals are applied, characterized in that a hole 123 having a diameter of 0.1mm to 3.0mm is formed in the bottom flat portion 121. The method of claim 1, wherein the first metal part is a stainless steel metal, a chromium molybdenum steel as a plastic mold steel, a nickel chromium molybdenum steel, a Ni-Al-Cu-based mold steel, a machine structural carbon steel, a chromium alloy stainless steel mold, a copper alloy mold steel, or The lower mold of the molding machine for producing burnout casings to which different metals are applied, characterized in that any one selected from alloy tool steel is applied. The lower mold of claim 1, wherein the second metal part is made of copper alone or copper alloy steel. The lower mold of a molding machine for producing burnout casings to which different metals are applied, according to claim 1, wherein the bottom flat portion (121) is detachable from the lower mold of the molding machine. A method for manufacturing an exhaust casing by using the lower mold of the molding machine for manufacturing an exhaust casing according to any one of claims 1 to 4, comprising: nylon 6, nylon 11, nylon 12, nylon 46, nylon 66, nylon 610, nylon 612 , Nylon-MXD 6, nylon copolymer, transparent nylon resin selected from any one nylon mesh or stainless steel metal mesh with a scale size of 0.1 μm to 100 μm, including final molding of an exhausted casing and a temporary molded body. How to make a casing.

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