KR101668955B1 - Manufacturing method of structure with reinforce fiber composite using 3d printer - Google Patents

Manufacturing method of structure with reinforce fiber composite using 3d printer Download PDF

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KR101668955B1
KR101668955B1 KR1020150089935A KR20150089935A KR101668955B1 KR 101668955 B1 KR101668955 B1 KR 101668955B1 KR 1020150089935 A KR1020150089935 A KR 1020150089935A KR 20150089935 A KR20150089935 A KR 20150089935A KR 101668955 B1 KR101668955 B1 KR 101668955B1
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South Korea
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fiber
printer
matrix
reinforced composite
layer
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KR1020150089935A
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Korean (ko)
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임윤묵
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연세대학교 산학협력단
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28BSHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00Producing shaped prefabricated articles from the material
    • B28B1/30Producing shaped prefabricated articles from the material by applying the material on to a core or other moulding surface to form a layer thereon
    • B28B1/40Producing shaped prefabricated articles from the material by applying the material on to a core or other moulding surface to form a layer thereon by wrapping, e.g. winding
    • B28B1/42Producing shaped prefabricated articles from the material by applying the material on to a core or other moulding surface to form a layer thereon by wrapping, e.g. winding using mixtures containing fibres, e.g. for making sheets by slitting the wound layer
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28BSHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00Producing shaped prefabricated articles from the material
    • B28B1/52Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B33ADDITIVE MANUFACTURING TECHNOLOGY
    • B33YADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y50/00Data acquisition or data processing for additive manufacturing
    • B33Y50/02Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B33ADDITIVE MANUFACTURING TECHNOLOGY
    • B33YADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y80/00Products made by additive manufacturing
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B16/00Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B16/04Macromolecular compounds
    • C04B16/06Macromolecular compounds fibrous

Abstract

The present invention relates to a method for manufacturing a fiber-reinforcing composite material structure using a 3D printer and a fiber-reinforcing composite material structure manufactured by the method. According to the present invention, a fiber-reinforcing structure having a predetermined size, arrangement, and shape is formed in a space where the structure is to be formed by using a 3D printer and matrix formation and curing are performed in the remaining space where the structure is to be formed. With this simple method, the manufacturing process can be simplified and the duration of the process can be shortened. In addition, the dispersibility of the reinforcing fiber can be improved, the various shapes, arrangements, sizes, and the like can be controlled at will, and thus fiber-reinforcing composite material structures that have various characteristics can be manufactured.

Description

TECHNICAL FIELD [0001] The present invention relates to a method of manufacturing a fiber reinforced composite material structure using a 3D printer, and a structure manufactured by the method. [0002]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a fiber reinforced composite structure, and more particularly, to a method of manufacturing a fiber reinforced composite structure using a 3D printer capable of easily and quickly manufacturing a fiber reinforced structure having high tensile strength, bending strength, impact resistance, toughness, And to a structure manufactured by the method.
The main components of cementitious composites containing concrete, which are widely used as materials for construction, are sand, gravel, cement and water. The cementitious composite material comprises cement, water, and at least one coarse or fine aggregate. The water reacts with the cement to form a cement paste. The cement paste formed is fine aggregate or coarse aggregate. Bring the aggregates together.
When cement and water are cured (ie, hydrated) to bond cement and water, aggregates and other solid components, the final cementitious composite material can have very high compressive strength and flexural modulus, Is a brittle material having a relatively low tensile strength and low toughness in comparison with its compressive strength. Nevertheless, by adding reinforcing members such as rebars or massive structures, the cementitious aggregate material is used for roads, structural floors, and generally large large structures.
Cement based concrete materials containing concrete are prepared using hydratable cement binders, fine aggregates (eg sand) and coarse aggregates (eg small stones, gravel). Mortar is manufactured using cement and fine aggregate. Thus, mortars are fragile materials. If a cementitious composite material such as mortar or a concrete structure is subjected to stresses exceeding its maximum tensile strength, cracks can be initiated and propagated within these structures. The ability of a cementitious structure to resist crack initiation and crack propagation can be seen with reference to the "strength" and "fracture toughness" of the material.
"Strength" relates to the ability of a cement or concrete structure to resist crack initiation. In other words, the strength is proportional to the maximum load the structure can support without cracking, and is a measure of the minimum load or stress required to initiate cracking in the structure (e.g., "critical stress intensity factor").
On the other hand, "fracture toughness" refers to a specific "fracture energy" of a cement or concrete structure. This concept refers to the ability of a structure to withstand the propagation (or extension) of a crack present in it. This toughness is proportional to the energy required to propagate or expand the crack. This property can be determined by simultaneously measuring the load and the degree of deflection or intensity required to deform or "deflect" the fiber-reinforced cementitious composite beam specimen in the disclosed cracks. Therefore, the fracture toughness is determined by dividing the area under the load deflection curve (created by plotting the load on the deflection of the FRC specimen) by its cross-sectional area.
In the field of cement and concrete, fibers have been designed to increase the strength and fracture toughness of reinforcing materials. A number of fiber materials have been used for this purpose, such as steel, polymers (e.g. polyolefins), carbon, nylon, aramid and glass. The use of steel fibers to reinforce concrete structures is constantly on the rise due to the intrinsic strength of the metal.
However, one of the concerns in the design of reinforced fiber products is to increase or properly maintain the fiber "pull out" resistance because it increases the ability of the fibers to prevent crack propagation. In this regard, US Pat. No. 3,953,953 to Marsden discloses a fiber having a "J" shaped end to resist squeezing out of concrete. However, physically deformed stiff fibers are difficult to handle and can cause tangling problems where the fibers are difficult to uniformly disperse in the wet concrete mixture. More recent designs, including the use of "twisted" polymeric fibers or "wavy" polymeric fibers, may exhibit similar problems depending on the stiffness of the fiber material being used.
Polyolefin materials such as polypropylene and polyethylene have been used to reinforce cementitious composites and provide economic advantages due to their relatively low cost. However, these poly-based materials, which are hydrophobic or cariogenic, also resist the aqueous environment of wet concrete. In addition, larger amounts of polyolefin fibers required for concrete to approximate the strength and fracture toughness of steel fiber-reinforced cementitious composite materials often cause the fibers to agglomerate or "round together" and increase the mixing time in the workplace .
This tendency to form rounded fibers means that the fibers are not administered as desired. Often, the exact concentration of fibers is not obtained because the operator removes the rounded fibers with the intent to make the concrete surface smooth (when the loose bundles of fibers are visible on the concrete surface). Sometimes there are no reinforcing fibers at various locations within the cement structure. Therefore, the desired homogeneous fiber dispersion is not achieved.
Methods for easily dispersing fibers in concrete are known. For example, US Patent No. 4,961, 790 to Smith et al. Discloses a method of using a water-soluble bag for introducing a plurality of fibers into a wet mixture. U.S. Patent No. 5,224,774 to Valle et al. Discloses the use of a non-water soluble packaging which is mechanically cracked when blended so that the fibers are uniformly dispersed in the concrete mixture without agglomeration.
In addition, reinforcing fibers can be dispersed by making smaller amounts of individual fibers into a package. For example, U.S. Patent No. 5,807,458 to Sanders discloses fibers made from bundles using wrapping around the circumference. According to this patent, by stirring in a wet concrete mixture, the surrounding continuous rap is ruptured and the fibers
Can be released and dispersed in the mixture.
On the other hand, Leon, International Patent Publication No. WO 00/49211 (published Aug. 24, 2000) discloses fibers that are "tied together ", but can be separated when mixed into concrete. For example, a "packet" was made by attaching the tape to the cut end of the fiber and releasably bundling the plurality of fibers together. Within the wet cement admixture, the bundles could be loosened / loosened or disassembled separately to separate and disperse individual fibers within the mixture.
Another new solution is disclosed in U. S. Patent No. 6,197, 423 to Rieder et al., Which discloses mechanically flattened fibers. In order to improve the fixation in concrete, it is desirable to provide a method and apparatus for obtaining a stress fracture that is recognized as a discontinuous, irregular and random displacement of the polymer on the individual fiber surface via a variable width and / And flattened the fibers. This microscopic stress fracture improves the bond between the cement and the fibers and is believed to be due to the fact that the fibers are flexible to the extent that the fiber-to-fiber entanglement (and hence the rounding of the fibers) is minimized or eliminated because the stress cracks are virtually discontinuous . A method of mechanically flattening leads or the like is disclosed in Vondran, U.S. Patent No. 5,298,071, wherein the fibers are milled together with a cement clinker so that the fibers are buried in the surface of the cement particles ).
Thus, conventional fiber-reinforced composite materials are structural members made of a matrix and a fiber reinforcing material including concrete. The direction and density of the arrangement in the matrix of the fiber reinforcing material determine the characteristics of the composite material, It is a big factor that affects performance. However, as described above, it is difficult to uniformly disperse and stir the fiber reinforcing material in the matrix, and it is difficult to freely control the shape, arrangement and density of the fiber reinforcing material, .
Korean Registered Patent No. 10-0854894 (Registered Date: Aug. 21, 2008) Korean Registered Patent No. 10-1211906 (Registration date: December 06, 2012)
The method for manufacturing a fiber reinforced composite material structure using the 3D printer according to the present invention and the structure manufactured by the method have the following problems.
The present invention provides a method of manufacturing a fiber-reinforced composite material structure capable of simplifying a manufacturing process and shortening a process time, Reinforced composite structure of the present invention.
Second, the present invention aims to provide a method for manufacturing a fiber-reinforced peritoneal composite material having a shortened curing time and a higher tensile strength, a bending strength, an impact resistance and a toughness, and a structure thereof.
The solution of the present invention is not limited to those mentioned above, and other solutions not mentioned can be clearly understood by those skilled in the art from the following description.
A first aspect of the present invention to solve the above-described problems is to provide a fiber reinforcing member structure in a predetermined size, arrangement and shape using a 3D printer in a space in which a structure is to be formed, Forming a fiber-reinforced composite material structure using a 3D printer.
(A1) forming a fiber reinforcement structure in a predetermined size, arrangement, and shape using a 3D printer in a mold for forming a fiber-reinforced composite structure space; (a2) injecting and curing a matrix into the mold; And (a3) releasing the die from the cured fiber-reinforced composite structure.
The matrix preferably comprises a mortar, and the fibrous reinforcement is preferably made of a short fiber made of a metal or a synthetic fiber as a raw material. The short fiber may be a steel fiber, a glass fiber, Polyethylene fibers, polypropylene fibers, aramid fibers, and carbon fibers.
A) applying a matrix to a space of a fiber-reinforced composite material structure previously designated as a 3D printer to form a base layer; b) forming a fiber reinforcing layer on the base layer by laminating a fiber reinforcing material in a predetermined size, arrangement, and shape with a 3D printer; c) applying the matrix again onto the fiber-reinforced layer with a 3D printer to form a coated layer; And d) forming a fiber reinforcing layer by laminating a fiber reinforcing material on the coating layer with a 3D printer.
Preferably, the step c) and the step d) are repeated, and after the step c), at least one of size, arrangement and shape of the fiber reinforcement is controlled and set differently through the 3D printer .
It is preferable that the fiber reinforcing material is made of short fibers made of metal or synthetic fiber as a raw material, and the short fiber is at least one of steel fiber, glass fiber, polyethylene fiber, polypropylene fiber, aramid fiber and carbon fiber It is preferable that the fiber reinforcing material is a hydrophilic synthetic fiber having a receiver or a steel fiber having an end hook, and the matrix is preferably a cementitious matrix.
In addition, the above-described manufacturing method comprises the steps of: a) forming a base layer by applying a matrix to a fiber-reinforced composite structure space previously designated with a 3D printer; b) forming a fiber reinforcing layer on the base layer by laminating a fiber reinforcing material in a predetermined size, arrangement, and shape with a 3D printer; c) curing the base layer; d) applying the matrix again onto the reinforcing layer with a 3D printer to form a coating layer; e) curing the coating layer; And f) forming the fiber-reinforced layer on the cured coating layer with a 3D printer.
Preferably, the step (d) to (f) is repeated, and after step (c), at least one of size, arrangement and shape of the fiber reinforcement is controlled and set differently through the 3D printer And the fiber reinforcing material is preferably made of a short fiber made of metal or synthetic fiber as a raw material.
It is preferable that the staple fiber is at least one of steel fiber, glass fiber, polyethylene fiber, polypropylene fiber, aramid fiber and carbon fiber, and the matrix is preferably a cement matrix.
The second aspect of the present invention is a fiber-reinforced composite material structure using a 3D printer, which is manufactured by the above-described method for manufacturing a fiber-reinforced composite material structure.
The method for manufacturing a fiber reinforced composite material structure using the 3D printer according to the present invention and the fiber-reinforced composite material structure produced by the method have the following effects.
First, the present invention provides a simple fiber reinforced composite material manufacturing method that can simplify the process and shorten the process time.
Second, the present invention provides a method for manufacturing a fiber-reinforced composite material structure having various properties by freely controlling various shapes, arrangements, sizes and the like as well as improving the dispersibility of the reinforcing fibers without going through the reinforcing fiber stirring process to provide
Third, the present invention can shorten the curing time of the concrete structure, and can stably form the fiber reinforcing layer, and can provide a high quality fiber reinforced with properties of higher tensile strength, bending strength, impact resistance and toughness A method for manufacturing a composite material structure and a fiber-reinforced composite material structure thereof are provided.
The effects of the present invention are not limited to those mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the following description.
1 is a view showing a flow of a method of fabricating a fiber-reinforced composite material structure using a 3D printer according to an embodiment of the present invention.
2 is a schematic view illustrating a process of manufacturing a fiber-reinforced structure according to an embodiment of the present invention.
3 is a schematic diagram of a 3D printer for fabricating a fiber-reinforced composite structure according to an embodiment of the present invention.
4 is a flowchart illustrating a method of fabricating a fiber-reinforced composite structure using a 3D printer according to another embodiment of the present invention.
5 is a schematic view illustrating a process of manufacturing a fiber reinforced structure according to an embodiment of the present invention.
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Wherever possible, the same or similar parts are denoted using the same reference numerals in the drawings.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular forms as used herein include plural forms as long as the phrases do not expressly express the opposite meaning thereto.
Means that a particular feature, region, integer, step, operation, element and / or component is specified and that other specific features, regions, integers, steps, operations, elements, components, and / It does not exclude the existence or addition of a group.
All terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Predefined terms are further interpreted as having a meaning consistent with the relevant technical literature and the present disclosure, and are not to be construed as ideal or very formal meanings unless defined otherwise.
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
1 is a view showing a flow of a method of fabricating a fiber-reinforced composite material structure using a 3D printer according to an embodiment of the present invention. As shown in FIG. 1, a method of fabricating a fiber-reinforced composite material structure using a 3D printer according to an embodiment of the present invention includes the steps of: And forming a matrix in the remaining space where the fiber-reinforced composite structure is to be formed, thereby curing the fiber-reinforced composite structure.
As described above, the embodiment of the present invention improves the difficulty of forming a conventional fiber reinforcing member structure by forming the fiber reinforcing member structure included in the fiber reinforced composite structure precisely and finely using a 3D printer, Reinforced composite material structure can be formed quickly and easily, thereby simplifying the manufacturing process and shortening the process time. In addition, it is possible to provide a simple fiber-reinforced composite material structure having various shapes, The present invention provides a new method of fabricating a fiber-reinforced composite material structure capable of freely controlling the arrangement, size, and the like of the fiber-reinforced composite material structure.
Fig. 2 is a schematic view of a process for manufacturing a fiber-reinforced composite material structure according to an embodiment of the present invention. As shown in FIG. 2, a fiber reinforced structure manufacturing method according to an embodiment of the present invention includes the steps of (a1) forming a fiber reinforcing structure in a predetermined size, arrangement, and shape using a 3D printer in a mold for forming a structure space ; (a2) injecting and curing a matrix into the mold; And (a3) releasing the mold from the cured fiber-reinforced composite structure.
That is, as shown in FIG. 2, according to the embodiment of the present invention, a mold frame is formed in a space in which a fiber reinforced composite structure is to be formed according to a design plan, and a three- As shown in Fig. The fiber reinforced composite structure can be manufactured quickly and easily by curing the matrix by injecting the matrix into the space inside the mold.
Unlike the conventional method of injecting a fiber reinforcing material into a mold and then injecting a matrix into the mold, the fiber reinforcing material is uniformly dispersed and distributed in the space of the fiber reinforced composite structure, A stacked fiber reinforcing member structure is formed on a layer basis using a 3D printer so that it can be accurately formed and the density, arrangement, direction, shape and the like of the fiber reinforcing member can be precisely and accurately formed without distortion, The present invention provides a method for manufacturing a high quality fiber-reinforced composite material structure having properties such as bending strength, impact resistance and toughness, and a structure thereof.
The matrix preferably comprises a mortar. Mortar is a mixture of cement and water. It has a sufficient mixing capacity to withstand the weight of the brick, even though it can be treated with trowel and thin as it flows down. Therefore, it forms the base material for forming the structure inside the formwork. And the strength of the structure can be increased by maintaining the shape and shape of the fiber reinforced structure sufficiently in the fiber reinforced composite structure.
In addition, it is possible to add calcium hydroxide, coloring agent, and the like as an additive material among the constituents of the mortar, and in particular, the cement is a necessary factor for maintaining the firmness and the waterproof effect. In addition, if the mortar is hardened, it is hard like a stone, and if it is used properly, it can disperse the load of the structure evenly along the bonded surface and can also prevent wind and rain. Therefore, It may be applied by varying the mixing ratio.
FIG. 3 is a view showing a flow of a method of manufacturing a fiber-reinforced composite material structure using a 3D printer according to another embodiment of the present invention, and FIG. 4 is a schematic view of a process of manufacturing a fiber- And FIG. 5 is a schematic view of a 3D printer for manufacturing a fiber-reinforced structure according to an embodiment of the present invention.
3 and 4, a method of fabricating a fiber-reinforced composite structure according to an embodiment of the present invention includes the steps of: a) forming a base layer by applying a matrix to a 3D printer (S100); b) forming a fiber reinforcing layer on the base layer by stacking the fiber reinforcing material in a predetermined size, arrangement, and shape with a 3D printer (S110); c) forming a coating layer by applying the matrix again on the fiber reinforcing layer with a 3D printer (S120); And d) forming a fiber reinforcing layer by laminating a fiber reinforcing material on the coating layer with a 3D printer (S130).
As described above, in the method of fabricating a fiber-reinforced composite material structure according to an embodiment of the present invention, a mold is formed, a reinforcing frame is formed inside the fiber-reinforced composite material manufacturing method, A fiber reinforced composite material structure is manufactured by stacking a fiber reinforcing layer having a matrix layer and a predetermined size, shape and arrangement, etc. using a 3D printer, thereby simplifying the manufacturing process and shortening the process time The present invention provides a simple structure manufacturing method.
In addition, in the case of the conventional fiber reinforcing material, the fiber reinforcing material is not uniformly dispersed in the method in which the fiber reinforcing concrete composite is formed by mixing the cement matrix through the mixer or agitator in the case of the conventional fiber reinforcing material, In order to improve the arrangement, shape, size, and the like of the fiber reinforcing material so as to form the performance, and to solve the problem that can not be controlled in the process as necessary, a 3D printer The present invention provides a method of repeatedly fabricating a structure by laminating a fiber reinforcing layer having a predetermined arrangement, shape and size.
As shown in FIG. 5, the 3D printer used in the method of manufacturing a fiber-reinforced structure according to the embodiment of the present invention includes a nozzle for scanning a printing material, such as a general printer, And an integrated control unit for integrally controlling them.
Here, the nozzle is composed of a matrix nozzle for scanning a matrix, which is a structure printing material, and a fiber reinforced layer nozzle for scanning a fiber reinforcing material, and the transfer device is formed in a structure similar to a crane and is an integrated control part for controlling the nozzle and the transfer device. Device is included and configured. That is, the computing device, which is an integrated controller, controls the drive to position the matrix or fiber reinforcement for stacking, and controls the nozzles to control the amount of stack or thickness and size.
Preferably, the 3D printer used in the method for fabricating a fiber-reinforced structure according to the embodiment of the present invention further includes a structure material storage device connected to the nozzle to receive and store a printing material, And a storage device for storing the fiber reinforcing material are separated from each other.
When a structure is manufactured by a lamination method using such a 3D printer, not only the construction of the structure is very easy, but also the construction period is shortened. In addition, the fiber-reinforced composite structure formed by laminating the fiber-reinforced layer and the matrix layer has a high rigidity and a high crack resistance, as well as a considerable improvement in tensile strength, bending strength, impact resistance and toughness of the fiber- Can be obtained.
Hereinafter, the process of each step will be described in detail with reference to the drawings.
As shown in Figs. 3 and 4, (a) step (S100) is a step of forming a base layer by applying a matrix to a 3D printer. Here, the matrix refers to a main component of a building material composite, that is, a portion that becomes a matrix for various additive components as building materials. In general, the matrix refers to a cement matrix, and the cement matrix is a binder made of a mixture of various materials in limestone as a bonding agent for use in construction, civil engineering, and the like.
There are various types of cement matrix depending on the material to be mixed, strength, etc., alumina cement, blast furnace slag cement. Pozzolan cement, and other additives. Generally, cementitious matrix used for concrete as building material is usually portland cement, and cementitious matrix having a compressive strength of 28 days is widely used.
That is, step (a) is a step of forming the base layer by applying the cement matrix while moving the nozzle to a position designated by the design drawing through the 3D printer.
(b) Step (S110) is a step of forming a fiber reinforcing layer on the base layer by laminating a fiber reinforcing material in a size, arrangement and shape predetermined by a 3D printer. That is, the step of laminating the fiber reinforcing material on the base layer is spraying and stacking by the fiber reinforcing layer nozzle so as to match the size, arrangement and shape preset by the integrated controller of the 3D printer.
It is preferable that the fiber reinforcing material is made of a short fiber made of metal or synthetic fiber as a raw material, and the short fiber is at least one of steel fiber, glass fiber, polyethylene fiber, polypropylene fiber, aramid fiber, . Further, the fiber reinforcing material may be of a type of hydrophilic synthetic fiber having a receiver or a steel fiber having an end hook.
Conventionally, since the concrete has a small tensile and bending strength and a small deformation capacity, it has a drawback that it is liable to cause cracks which are harmful to self-durability or safety during a public period. After the maximum stress is reached, It is common to use a fiber reinforced cement composite material or a fiber reinforced concrete composite material.
Fiber Reinforced Concrete is a concrete material that improves tensile strength, bending strength, impact resistance and toughness by mixing short-fiber material made of metal or synthetic resin as raw material. Include steel fibers, glass fibers, polyethylene fibers, polypropylene fibers, aramid fibers, and carbon fibers.
That is, it is possible to reinforce concrete by using carbon fiber, aramid fiber vinyl fiber, and the like. Conventionally, not only a method of dispersing and mixing them into concrete as short fibers, but also a reinforcing effect It is preferable to use it as a material of the fiber reinforcing material.
Conventionally, PFRC reinforced with polypropylene fiber for concrete admixture has been developed and popularized. This has a property of significantly increasing the resistance to various factors such as crack suppression, impact, abrasion, permeability, corrosion, It is preferable to use it as a material of the fiber reinforcing material.
It is preferable that the fiber reinforcing material is a hydrophilic synthetic fiber having a receiver or a steel fiber having an end hook so that the hydrophilic synthetic fiber can enhance hydration and adhesion with the cement which is the matrix layer and the steel fiber having an end hook as a steel fiber It is possible to obtain an effect that the hook acts as a ring to increase the resistance.
However, such a conventional fiber-reinforced concrete composite material is difficult to mix and knead when the amount of mixed fibers is increased, and it is difficult to uniformly disperse the fiber reinforcing material, and the workability is also deteriorated.
In addition, conventional fiber-reinforced concrete has many advantages, but there is a great difference in the air amount, slump, dispersibility, crack reduction and strength improvement effect of concrete depending on the kind, form and mixing ratio of the fiber. Therefore, The size, the arrangement and the shape of the fiber reinforcement can be selectively controlled so that the composite fiber can be used as a high-performance composite material.
In the embodiment of the present invention, a fiber reinforcing layer having a uniform thickness is formed in a cement matrix layer having a uniform thickness, and the fiber reinforcing layer is laminated according to a predetermined size, arrangement, By arranging the fiber-reinforced composite material structure of the present invention, it is possible to improve the dispersibility by positioning the fibers at regular intervals without any mixing and stirring process, and to freely control various shapes, arrangements, The present invention provides a method of manufacturing a semiconductor device.
(c) a step (S120) of coating the matrix again on the fiber reinforcing layer with a 3D printer to form a coating layer; and d) a step (S130) Thereby forming a fiber reinforcing layer. That is, steps c) and d) are a step of repeating steps a) and b) to stain the matrix layer and the fiber reinforcing layer.
In other words, since the embodiment of the present invention repeatedly laminates the matrix layer and the fiber reinforcing layer to form a fiber-reinforced composite material structure, it can be uniformly distributed on the plane according to the arrangement of the two-dimensional short fibers to increase the dispersibility, It is possible to obtain an effect that the fiber reinforcing layer is uniformly distributed by the lamination in the height or depth direction to improve the dispersibility. Therefore, the tensile strength, the bending strength, and the tensile strength of the concrete structure are higher than those of the conventional fiber reinforced concrete Impact resistance, toughness and the like can be greatly improved.
FIG. 6 is a view showing a flow of a method of fabricating a fiber-reinforced composite material structure using a 3D printer according to another embodiment of the present invention, and FIG. 7 is a schematic view of a process of manufacturing a fiber- to be.
6 and 7, a method of fabricating a fiber-reinforced composite structure according to an embodiment of the present invention includes the steps of: a) forming a base layer by applying a matrix to a 3D printer (S200); b) forming a fiber reinforcing layer on the base layer by stacking the fiber reinforcing material in a predetermined size, arrangement, and shape with a 3D printer (S210); c) curing the base layer (S220); d) forming a coating layer by applying the matrix again on the reinforcing layer with a 3D printer (S230); e) curing the coating layer (S240); And f) forming the fiber-reinforced layer on the cured coating layer with a 3D printer (S250).
The embodiment shown in Figs. 6 and 7 differs from the embodiment shown in Figs. 3 and 4 in that a cement matrix layer is formed and then cured, wherein a fiber reinforcing layer is formed on the cement matrix layer, The cement matrix is cured to a certain extent by heating or the like to secure the rigidity of the layer on which the lamination is based and to improve the adhesion performance of the fiber reinforcing layer to uniformly and stably form the fiber reinforcing layer.
 Here, the curing is slightly different from the curing of the concrete. The curing is an operation in which the concrete is subjected to hydration and hydration naturally over time. However, the curing applied in the embodiment of the present invention is such that the moisture is completely evaporated Refers to the step of curing the cement matrix layer by adjusting moisture, time, and temperature to form a predetermined and simulated hardness that is not fully cured.
That is, in the practice of the present invention, when the matrix layer is formed and then lightly cured to form the matrix layer and the fiber reinforcing layer and then laminated in a weakly curing manner to form the fiber reinforced composite structure, It is possible not only to shorten the time, but also to stably form the fiber reinforcing layer, and it becomes possible to produce a fiber reinforced composite material structure of high quality having characteristics of higher tensile strength, bending strength, impact resistance and toughness .
Here, the curing of the matrix layer may be performed by setting the curing time, the temperature, the humidity, and the like in advance, or may be set differently depending on the stacking height. This is because the stresses due to gravity depend on the stacking height, and the proper strengths required for each layer of the matrix are different.
The embodiments and the accompanying drawings described in the present specification are merely illustrative of some of the technical ideas included in the present invention. Accordingly, the embodiments disclosed herein are for the purpose of describing rather than limiting the technical spirit of the present invention, and it is apparent that the scope of the technical idea of the present invention is not limited by these embodiments. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (19)

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  6. Arranging the fiber reinforcement structure in a predetermined size, arrangement and shape using a 3D printer in a space where a structure is to be formed, forming a matrix in the remaining space where the structure is to be formed,
    a) applying a matrix to a space of a fiber-reinforced composite material structure previously designated as a 3D printer to form a base layer;
    b) forming a fiber reinforcing layer on the base layer by laminating a fiber reinforcing material in a predetermined size, arrangement, and shape with a 3D printer;
    c) applying the matrix again onto the fiber-reinforced layer with a 3D printer to form a coated layer; And
    d) forming a fiber reinforcing layer by laminating a fiber reinforcing material on the coating layer with a 3D printer to form a fiber reinforced composite structure.
  7. The method of claim 6,
    Wherein the step c) and the step d) are repeated.
  8. The method of claim 6,
    Further comprising, after the step (c), controlling at least any one of the size, arrangement and shape of the fiber reinforcement through the 3D printer to set differently. Gt;
  9. The method of claim 6,
    The fibrous reinforcement material may be,
    A method for manufacturing a fiber-reinforced composite material structure using a 3D printer, comprising the steps of: preparing a short fiber made of metal or synthetic fiber as a raw material;
  10. The method of claim 9,
    The staple fiber may be a single-
    Wherein the fiber reinforced composite material is at least one of steel fiber, glass fiber, polyethylene fiber, polypropylene fiber, aramid fiber, and carbon fiber.
  11. The method of claim 6,
    Wherein the fiber reinforcing material is a hydrophilic synthetic fiber having a receiver or a steel fiber having an end hook.
  12. The method of claim 6,
    Wherein the matrix comprises:
    Wherein the fiber reinforced composite material is a cement matrix.
  13. Arranging the fiber reinforcement structure in a predetermined size, arrangement and shape using a 3D printer in a space where a structure is to be formed, forming a matrix in the remaining space where the structure is to be formed,
    a) applying a matrix to a space of a fiber-reinforced composite material structure previously designated as a 3D printer to form a base layer;
    b) forming a fiber reinforcing layer on the base layer by laminating a fiber reinforcing material in a predetermined size, arrangement, and shape with a 3D printer;
    c) curing the base layer;
    d) applying the matrix again onto the reinforcing layer with a 3D printer to form a coating layer;
    e) curing the coating layer; And
    f) forming the fiber-reinforced layer on the cured coated layer with a 3D printer.
  14. Claim 13:
    And repeating the steps d) to f). ≪ Desc / Clms Page number 20 >
  15. 14. The method of claim 13,
    Further comprising, after the step (c), controlling at least any one of the size, arrangement and shape of the fiber reinforcement through the 3D printer to set differently. Gt;
  16. 14. The method of claim 13,
    The fibrous reinforcement material may be,
    A method for manufacturing a fiber-reinforced composite material structure using a 3D printer, comprising the steps of: preparing a short fiber made of metal or synthetic fiber as a raw material;
  17. 18. The method of claim 16,
    The staple fiber may be a single-
    Wherein the fiber reinforced composite material is at least one of steel fiber, glass fiber, polyethylene fiber, polypropylene fiber, aramid fiber, and carbon fiber.
  18. 14. The method of claim 13,
    Wherein the matrix comprises:
    Wherein the fiber reinforced composite material is a cement matrix.
  19. A fiber-reinforced composite material structure using a 3D printer, which is manufactured by the method for manufacturing a fiber-reinforced composite material structure according to claim 6 or claim 13.
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KR101914523B1 (en) * 2017-01-19 2018-11-02 연세대학교 산학협력단 Apparatus for 3d printed concrete binding redistribution
KR101911404B1 (en) * 2017-01-19 2018-12-19 연세대학교 산학협력단 Concrete extrusion apparatus for 3d printing system
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KR20200094600A (en) 2019-01-30 2020-08-07 임기택 The manufacturing technology of modified glass fiber reinforced concrete(MGFRC) matrix which is possible to use 3D printing method and the bottom fountain made with the structure of MGFRC matrix by 3D printing method
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US10807186B2 (en) 2016-04-06 2020-10-20 Honda Motor Co., Ltd. Hybrid structures for joining of metals and continuous fiber materials
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KR20200094600A (en) 2019-01-30 2020-08-07 임기택 The manufacturing technology of modified glass fiber reinforced concrete(MGFRC) matrix which is possible to use 3D printing method and the bottom fountain made with the structure of MGFRC matrix by 3D printing method

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