KR20240109463A - manufacturing apparatus for integrated solid frame using high vacuum continuous infusion forming - Google Patents

Abstract

In order to improve manufacturing precision, the present invention provides a mold portion in which a molded portion corresponding to the outer contour of the three-dimensional structure to be molded is formed on one surface on which the reinforced fiber fabric is disposed; A vacuum bag tightly coupled along the edge of the molded portion exposed from the reinforced fiber fabric so that the reinforced fiber fabric is placed in a closed space partitioned from the outside; a resin injection unit connected to one side of the vacuum bag to inject matrix resin into the sealed space so that the reinforced fiber fabric is impregnated; a vacuum forming unit connected to the other side of the vacuum bag to form a vacuum lower than a preset process pressure in the sealed space so that the injected matrix resin is vacuum diffused; And the mattress resin in the closed space is provided with a glass fiber material having pores through which gas inside the closed space passes for vacuum diffusion, one end of which is in close contact with the suction end of the vacuum forming unit and the other end is disposed in the closed space. An integrated three-dimensional structure manufacturing device using high vacuum continuous infusion molding including an air bridge portion disposed on the edge of the reinforced fiber fabric is provided.

Description

{Manufacturing apparatus for integrated solid frame using high vacuum continuous infusion forming}

The present invention relates to an integrated three-dimensional structure manufacturing device using high vacuum continuous infusion molding, and more specifically, to an integrated three-dimensional structure manufacturing device using high vacuum continuous infusion molding with improved manufacturing precision.

Recently, in order to improve the energy efficiency of transportation methods such as aircraft, ships, and automobiles, efforts are being made to replace structural materials of transportation devices with composite materials that are lightweight and have high structural stability.

Here, a representative example of a composite material is fiber reinforced plastic (FRP), which is a reinforcing material such as glass fiber or carbon fiber impregnated with a curable matrix resin such as epoxy.

In this structure using composite materials, dried reinforced fiber fabrics are placed on the mold surface in the form of a preform, the product surface is packed with a vacuum bag, and resin is injected in a vacuum to form the preform corresponding to the surface contour of the mold. It is manufactured using infusion molding technology that impregnates and hardens into shapes.

However, in the past, when a plurality of air outlets for forming a vacuum and resin inlets for resin injection are provided between the mold and the vacuum bag, the air outlet for maintaining the vacuum pressure cannot be locked before the resin injection is completed, so the resin injection process Inevitably, there was a difference in the resin injection speed in each area, and there was a problem that the resin was discharged from the air outlet in the area where resin injection was completed.

Accordingly, there was a problem of excessive discharge of resin through the air outlet and a flow of resin inside the vacuum bag, which acted as a factor impeding resin impregnation of the unimpregnated area.

To solve this problem, resin discharge is prevented by lowering the pressure of the vacuum pump, but there is a problem in that the vacuum pressure is artificially adjusted by the operator, causing difficulties in production management/quality control. There was a problem that the internal vacuum pressure was lowered, and the resin content of the molded product was higher than necessary, which lowered economic efficiency.

Korean Patent No. 10-1621817

In order to solve the above problems, the present invention aims to provide an integrated three-dimensional structure manufacturing device using high vacuum continuous infusion molding with improved manufacturing precision.

In order to solve the above problem, the present invention provides a mold portion in which a molded portion corresponding to the outer contour of the three-dimensional structure to be molded is formed on one surface on which the reinforced fiber fabric is disposed; A vacuum bag tightly coupled along the edge of the molded portion exposed from the reinforced fiber fabric so that the reinforced fiber fabric is placed in a closed space partitioned from the outside; a resin injection unit connected to one side of the vacuum bag to inject matrix resin into the sealed space so that the reinforced fiber fabric is impregnated; a vacuum forming unit connected to the other side of the vacuum bag to form a vacuum lower than a preset process pressure in the sealed space so that the injected matrix resin is vacuum diffused; And the mattress resin in the closed space is provided with a glass fiber material having pores through which gas inside the closed space passes for vacuum diffusion, one end of which is in close contact with the suction end of the vacuum forming unit and the other end is disposed in the closed space. An integrated three-dimensional structure manufacturing device using high vacuum continuous infusion molding including an air bridge portion disposed on the edge of the reinforced fiber fabric is provided.

Here, both sides of the air bridge are in close contact with the rim of the vacuum bag and the rim of the forming part by vacuum pressure, and one end of the air bridge part is preferably arranged to cover the entire cross-section of the suction end of the vacuum forming part.

In addition, the air bridge unit is a flat plate having a preset length between one end and the other end so that a vacuum below the process pressure is maintained in the sealed space until the mattress resin is cured in the sealed space by the vacuum forming unit. Preferably, the suction end and the reinforcing fiber fabric are spaced apart from each other at a predetermined distance.

In addition, it is preferable that the air bridge further includes a porous resin absorbent sheet disposed between the reinforced fiber fabric and the vacuum bag, and the air bridge portion is made of the same material as the resin absorbent sheet.

In addition, the vacuum forming unit includes a vacuum pump driven to form vacuum pressure, a resin trap provided to store the introduced mattress resin, one end connected to the suction end and the other end branched, and the vacuum pump and the resin It is preferable to include a branch connection pipe that is connected to the trap and has a first on-off valve at one end connected to the suction end, and has a second on-off valve at the other branched end connected to the vacuum pump.

Through the above solutions, the present invention provides the following effects.

First, one end and the other end of the air bridge located on the suction end of the vacuum forming part and the edge of the reinforced fiber fabric are made of a porous glass fiber material to continuously maintain the vacuum pressure in the closed space evenly, thereby maintaining the entire closed space. Since the mattress resin is uniformly vacuum diffused and hardened, manufacturing precision can be significantly improved.

Second, the two sides of the air bridge are closely attached by vacuum pressure between the vacuum bag and the forming part, and the movement speed of the mattress resin flowing to the suction end of the vacuum forming part is delayed as it passes through the pores of the air bridge part made of glass fiber, making it a three-dimensional object to be molded. The mattress resin discharged until the structure is manufactured can be minimized, thereby significantly improving economic efficiency.

Third, the curing by-products generated during curing of the matrix resin are smoothly collected and removed in the porous resin absorbent sheet placed between the reinforced fiber fabric and the vacuum bag, so that the molding quality of the process can be further improved.

Figure 1 is a longitudinal cross-sectional view showing an integrated three-dimensional structure manufacturing apparatus using high vacuum continuous infusion molding according to an embodiment of the present invention.
Figure 2 is a cross-sectional view taken in the AB direction of Figure 1.
Figure 3 is a cross-sectional view in the CD direction of Figure 1.
Figure 4 is an exemplary diagram showing the use state of an integrated three-dimensional structure manufacturing device using high vacuum continuous infusion molding according to an embodiment of the present invention.
Figure 5 is an exemplary view showing a three-dimensional structure to be molded manufactured through an integrated three-dimensional structure manufacturing apparatus using high vacuum continuous infusion molding according to an embodiment of the present invention.

Hereinafter, a device for manufacturing an integrated three-dimensional structure using high vacuum continuous infusion molding according to a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

Figure 1 is a longitudinal cross-sectional view showing an integrated three-dimensional structure manufacturing apparatus using high vacuum continuous infusion molding according to an embodiment of the present invention, Figure 2 is a cross-sectional view in the A-B direction of Figure 1, and Figure 3 is a cross-sectional view in the C-D direction of Figure 1. , Figure 4 is an exemplary diagram showing the state of use of an integrated three-dimensional structure manufacturing device using high vacuum continuous infusion molding according to an embodiment of the present invention, and Figure 5 is a diagram showing the use state of high vacuum continuous infusion molding according to an embodiment of the present invention. This is an example diagram showing a three-dimensional structure to be molded manufactured using an integrated three-dimensional structure manufacturing device.

As shown in Figures 1 to 5, the integrated three-dimensional structure manufacturing apparatus 100 using high vacuum continuous infusion molding according to an embodiment of the present invention includes a mold part 10, a vacuum bag 20, and a resin injection part ( 30), a vacuum forming unit 30, and an air bridge unit 40.

In addition, the method of manufacturing an integrated three-dimensional structure using high vacuum continuous infusion molding according to an embodiment of the present invention consists of the following processes. First, a mold part 10 in which a molded part 11 having an outline corresponding to the outer surface contour of the three-dimensional structure to be molded (S) is formed is prepared.

Here, the three-dimensional structure (S) to be molded is a hollow three-dimensional structure having a closed peripheral surface, such as a three-dimensional structure in the shape of a hull, a pipe with one side closed, or a pipe with an opening of a certain size or more on one side. It means dimensional structure.

In addition, it is preferable that a molding portion 11 corresponding to the outer profile of the three-dimensional structure to be molded (S) is formed on one side of the mold portion 10 where the reinforced fiber fabric is disposed. That is, one surface of the mold part 10 is provided with the molding part 11 for molding the surface structure of the three-dimensional structure S to be molded. At this time, the molded portion 11 is provided to have a surface contour corresponding to the outer contour of the three-dimensional structure to be molded (S), such as a flat shape, wrinkled shape, uneven shape, or embossed shape, and is formed of a reinforced fiber fabric (f) and a matrix. Resin may be molded along the surface of the molded portion 11 to form the three-dimensional structure (S) to be molded.

Here, the mold part 10 may be divided up and down, left and right, front and back, or may be provided so that each side is separated from each other. Each divided part is transported to the work space and assembled, but when assembling, there is a gap between each divided part. It is preferable that the assembled end is sealed so as to be airtight.

Meanwhile, the vacuum bag 20 is in close contact with the edge of the molded portion 11 exposed from the reinforced fiber fabric (f) so that the reinforced fiber fabric (f) is placed in the sealed space 21 partitioned from the outside. Combination is preferred.

In detail, when the mold part 10 is prepared, the reinforcing fiber fabric (f) is placed along the molding part 11, and the arranged reinforcing fiber fabric (f) is preferably sealed by a vacuum bag (20). do. Moreover, in some cases, an air tube (not shown) is disposed outside the molded part 11 of the molded part 10 so that the reinforced fiber fabric (f) is temporarily fixed to the surface side of the molded part 11 to be expanded. It may be possible.

Here, the reinforced fiber fabric (f) is formed by weaving high-strength fibers such as glass fiber and carbon fiber, and can also be provided as a prepreg pre-impregnated with a matrix resin at a preset ratio to have a predetermined viscosity. However, for economic efficiency of the process, it is preferable that it is provided as a dry preform without preliminary impregnation with matrix resin.

At this time, the matrix resin is preferably provided as a thermosetting resin such as epoxy, amino, phenol, or polyester that cures at a certain temperature or higher.

In addition, the reinforced fiber fabric (f) can be laminated in multiple layers on the surface of the molded part 11, and is temporarily fixed to the surface of the molded part 11 with spray bond or grass tape, etc. desirable. At this time, it is preferable that the reinforced fiber fabric (f) is laminated on the surface of the molded part 11 and simultaneously covered by the vacuum bag 20.

In addition, the vacuum bag 20 is made of a polyolefin-based sheet that has a certain flexibility, excellent strength, and low air permeability.

In addition, the vacuum bag 20 is laminated to cover the laminated reinforced fiber fabric (f) and is closely coupled along the edge of the molded portion 11 exposed from the reinforced fiber fabric (f), thereby forming the reinforced fiber fabric. (f) may be placed in a closed space 21 partitioned from the outside.

In addition, it is preferable that the edge of the vacuum bag 20 is hermetically fixed along the edge of the mold part 10 using a sealant tape or the like. At this time, a closed space 21 encompassing the entire three-dimensional structure of the three-dimensional structure S to be molded may be formed integrally between the vacuum bag 20 and the mold part 10 to communicate with each other.

Here, it is more preferable that the edge of the vacuum bag 20 is coupled so as to be exposed to the outside of the mold part 10, and one side and the other part of the vacuum bag 20 exposed to the outside of the mold part 10. The discharge end of the resin injection unit 30 and the suction end of the vacuum forming unit 40 may be connected to each other.

At this time, one side of the vacuum bag 20 is preferably understood as a part corresponding to one edge of the mold part 10, and the other side of the vacuum bag 20 corresponds to the other edge of the mold part 10. It is desirable to understand it as a part that becomes possible.

Moreover, at the same time that the placement of the reinforced fiber fabric (f) and sealing through the vacuum bag 20 are completed, an air tube (not shown) may be placed outside the mold part 10. At this time, the outside of the air tube (not shown) is disposed opposite to the vacuum bag 20, and as compressed air is injected into the air tube (not shown), it expands and can come into close contact with the vacuum bag 20. there is. Here, the air tube (not shown) is formed of an elastic resin material such as polyurethane, silicone, or polyethylene, and its final expanded form is shaped to fit into the vacuum bag 20 surrounding the molded part 11. It is desirable to have it provided. At this time, an expansion control device (not shown) is connected to the air tube (not shown), so that the inflation pressure and internal temperature of the air tube (not shown) can be adjusted.

Here, the expansion control device (not shown) is connected to the inlet of the air tube (not shown) and is a compressed air supply unit that selectively supplies low-temperature compressed air below the preset curing temperature and high-temperature compressed air exceeding the curing temperature. (not shown) and a pressure control valve (not shown) that opens and closes the outlet of the air tube (not shown). That is, as the compressed air supply unit (not shown) is driven, low-temperature compressed air or high-temperature compressed air is injected into the air tube (not shown), thereby causing the air tube (not shown) to expand. And, when the air tube (not shown) is expanded into a shape corresponding to the molded part 11, the reinforced fiber fabric (f) can be temporarily fixed in close contact with the surface side of the molded part 11. Here, the sealing operation on the edge of the vacuum bag 20 can also be performed after the placement and expansion of the air tube (not shown), and the reinforced fiber fabric (f) disposed in the forming part 12 is further It can be quickly temporarily fixed, and disruption of the initial arrangement can be minimized. Accordingly, the reinforced fiber fabric (f) arranged three-dimensionally in the mold part 10 to correspond to the three-dimensional structure (S) can stably maintain its initial shape arranged in the molding part 11 without falling or sagging due to its own weight. there is. That is, in the subsequent process in which the reinforced fiber fabric (f) is impregnated and formed between the vacuum bag 20 and the molding unit 11 by vacuum pressure, the initial arrangement of the reinforced fiber fabric (f) is disturbed, resulting in forming errors and The occurrence of defects can be minimized.

On the other hand, when the reinforced fiber fabric (f) is placed in the closed space 21 between the molding part 11 and the vacuum bag 20 and is temporarily fixed through expansion of an air tube (not shown), the closed space ( The air in 21) is discharged to form a vacuum, and the matrix resin is injected into the sealed space 21.

Here, the resin injection unit 30 is preferably connected to one side of the vacuum bag 22 so that the reinforced fiber fabric (f) is impregnated and is provided to inject the matrix resin into the sealed space 21.

In addition, the vacuum forming unit 40 is connected to the other side of the vacuum bag 20 so that the matrix resin injected into the closed space 21 is vacuum diffused so that the process pressure lower than the preset process pressure in the closed space 21 It is preferable that it is provided to form a vacuum. At this time, vacuum diffusion means that the mattress resin spreads in the closed space 21 and the gas remaining in the closed space 21 is discharged to the vacuum forming unit 40 and removed.

In detail, the vacuum bag 20 includes the discharge end 31 of the resin injection part 30 and the vacuum forming part 40 on one side and the other side of the sealed portion along the opening of the mold part 10. The suction ends 41 may be connected respectively.

At this time, the resin injection part 30 has a storage part 34 in which the matrix resin in a liquid state is stored, and the storage part 34 and the discharge end 31 are connected, and a resin locking valve 33 is provided on one side. It may be provided including a resin supply pipe 32.

In addition, the vacuum forming unit 40 includes a vacuum pump 46 driven to form vacuum pressure, a resin trap 45 provided to store the introduced mattress resin, and one end connected to the suction end 41. The other end may be branched and include a branch connector 42 connected to the vacuum pump 46 and the resin trap 45.

At this time, the branch connector 42 is provided with a first opening and closing valve 43 at one end connected to the suction end 41, and a second opening and closing valve 43 at the branched other end connected to the vacuum pump 46. A valve 44 may be provided.

Here, when the vacuum pump is driven while the resin locking valve 33 is locked and the first on-off valve 43 and the second on-off valve 44 are open, the air in the closed space 21 is discharged, The pressure in the closed space 21 may decrease, forming a vacuum below the preset process pressure. At this time, the process pressure is preferably set to a high vacuum of 0.000075 torr or less, but can also be set to a medium vacuum of 25 torr or less for process productivity.

Then, when the pressure of the sealed space 21 decreases, the vacuum bag 20 comes into close contact with the molded part 11, and the reinforced fiber fabric (f) is transformed into a shape corresponding to the molded part 11. It can be.

Here, when the resin locking valve 33 is opened, the matrix resin in the storage unit 34 can be sucked into one side of the sealed space 21. At this time, the second opening/closing valve 44 is locked to prevent the inflow of resin into the vacuum pump 46, and the branch connector 42 passes through the other suction end 41 of the sealed space 21. The remaining resin flowing into can be discharged into the resin trap (45).

Then, when sufficient matrix resin is supplied to the closed space 21, the resin locking valve 33 and the first opening/closing valve 43 are closed, and the matrix resin previously sucked into the closed space 21 is vacuumed. As the diffusion rate increases due to the atmosphere, it can smoothly diffuse and penetrate into the pores in the reinforced fiber fabric (f) and be uniformly impregnated without defects such as bubbles. At this time, the expansion pressure of the air tube (not shown) may be controlled so that the diffused matrix resin is distributed and arranged at a preset thickness.

In addition, a large amount of matrix resin is disposed in the permanently closed space 21 on one side adjacent to the discharge end 31 of the resin injection unit 30 and on the other side adjacent to the suction end 41 of the vacuum forming unit 40. , a smaller amount of matrix resin may be disposed as the distance from the discharge end 31 or the suction end 41 increases. At this time, when the internal pressure of the air tube (not shown) supporting the inner surface of the vacuum bag 20 radially outward increases, the matrix resin disposed between the outer surface of the vacuum bag 20 and the molded part 11 It can be dispersed by being pressurized. That is, the air tube (not shown) is in a first internal pressure state expanded to support the reinforced fiber fabric (f) and the vacuum bag 20 toward the forming part 11, and the compressed air supply unit (not shown) is When additional compressed air is injected through the state, the state is converted into a second internal pressure exceeding the first internal pressure, and the vacuum bag 20 can be pressed toward the forming part 11. In addition, the air tube (not shown) is arranged to cover the entire inner surface of the vacuum bag 20, and the compressed air filled inside forms a uniform expansion pressure on each part of the surface of the air tube (not shown). Therefore, each inner part of the vacuum bag 20 can be uniformly pressurized.

Accordingly, one side of the sealed space 21 adjacent to the discharge end 31 of the resin injection unit 30 and the other side of the closed space 21 adjacent to the suction end 41 of the vacuum forming unit 40 The matrix resin disposed in can be smoothly dispersed to parts distant from the discharge end 31 or the suction end 41, and each part of the reinforced fiber fabric (f) can be impregnated and molded to a uniform thickness. there is. That is, partial swelling of the vacuum bag 20 due to excessive placement of the matrix resin is removed, and the three-dimensional structure to be molded (S) has a uniform thickness between the vacuum bag 20 and the mold portion 10. This can be molded.

In this way, the matrix resin, which is primarily diffused in the vacuum atmosphere of the sealed space 21, is secondarily pressurized by the expansion pressure of the air tube (not shown), so that it adheres precisely along the outline of the mold part 10 and adheres to the true shape of the mold part 10. The molding quality can be significantly improved by being distributed to a uniform thickness between the blank 20 and the mold portion 10.

In addition, even when forming the wide closed space 21 encompassing the overall structure of the three-dimensional structure to be molded (S), partial agglomeration or sagging of the matrix resin is minimized and each part of the reinforced fiber fabric (f) Because this can be stably impregnated, large three-dimensional structures can be manufactured integrally without division.

Meanwhile, in the step where the air tube (not shown) is expanded to temporarily fix the reinforced fiber fabric (f) and the vacuum bag 20, the inlet of the air tube (not shown) has a temperature lower than the curing temperature of the matrix resin. Low-temperature compressed air is injected. In addition, in the step where the expansion pressure of the air tube (not shown) is controlled, the compressed air filled in the air tube (not shown) is preferably replaced with high-temperature compressed air whose temperature exceeds the curing temperature of the matrix resin. do. For this purpose, a heating means is provided inside the compressed air supply unit (not shown) so that the compressed air supplied to the inlet of the air tube (not shown) can be selectively heated. Here, the curing temperature refers to the temperature at which the curing reaction of the matrix resin begins, and may vary depending on the type or content of the curing agent or accelerator added to the matrix resin.

For example, when imidazole or a tertiary amine salt is added to an epoxy resin, the curing reaction begins at 60 to 100°C, and the low-temperature compressed air is used at a temperature below 60°C to maintain the inactive state of the curing reaction. It is provided to have a temperature, but it is more preferable to have it at room temperature for process economics. In addition, the high-temperature compressed air is provided to have a temperature exceeding 60°C to activate the curing reaction, and is preferably provided at a temperature of 100°C or higher in consideration of activation energy to enable a smooth curing reaction.

At this time, from the step of temporarily fixing the reinforced fiber fabric (f) to the step of dispersing the matrix resin, low-temperature compressed air is filled when the air tube (not shown) is expanded and the expansion pressure is adjusted. In other words, the compressed air supplied inside when the air tube (not shown) is expanded is provided at a low temperature that does not cause hardening of the matrix resin, so the fluidity of the pre-impregnated matrix resin or the subsequently supplied liquid matrix resin can be maintained. there is.

Accordingly, since the matrix resin pre-impregnated or subsequently impregnated in the reinforced fiber fabric (f) can flow flexibly and smoothly, the reinforced fiber fabric (f) pressurized by an air tube (not shown) and the vacuum bag 20 ) and the matrix resin are gently deformed and can be precisely adhered to the molded part 11 and molded to an accurate thickness, thereby improving the quality of the molding process.

Then, the air tube (not shown) is expanded to a second internal pressure so that the matrix resin in the closed space 21 is dispersed, and when the preset dispersion waiting time elapses and the dispersion of the matrix resin is completed, the air tube (not shown) The compressed air filled in the compressed air is replaced with high-temperature compressed air. That is, high-temperature compressed air heated through the heating means is injected from the compressed air supply unit (not shown) into the inlet of the air tube (not shown), and the pressure is controlled according to the expansion pressure of the air tube (not shown). A valve (not shown) is opened and closed, and the filled compressed air can be circulated and discharged so that the air tube (not shown) maintains the second internal pressure state.

In addition, in a state where the air tube (not shown), the vacuum bag 20, the reinforced fiber fabric (f), and the molded part 11 are in close contact with each other due to the expansion pressure of the air tube (not shown), the air When high-temperature compressed air is circulated and supplied inside the tube (not shown), the inside of the air tube (not shown) is naturally replaced with high-temperature compressed air, and the heat of the high-temperature compressed air is impregnated into the reinforced fiber fabric (f). It is transferred to the matrix resin and the curing reaction can begin.

Accordingly, the subsequent curing process, such as transferring the reinforced fiber fabric (f) impregnated with the matrix resin to a separate heating chamber, can be simplified, and it can be easily cured even in the case of large three-dimensional structures for which it is practically impossible to construct a heating chamber. Since hardening can be achieved, the economics and compatibility of the process can be significantly improved.

In addition, unlike the conventional method of transmitting curing heat through a mold, material limitations on the mold can be eliminated, and unlike metal molds that require separate preheating time and have temperature deviations due to heat conduction, rapid and uniform curing can be achieved. Fairness can be done.

In this way, the matrix resin maintains an inactive state for the curing reaction through an air tube (not shown) filled with low-temperature compressed air below the curing temperature and is smoothly dispersed and deformed in a high fluidity state, but high-temperature compressed air is supplied to the air tube (not shown). As is replaced and filled, the matrix resin and the reinforced fiber fabric (f) can be naturally cured by accurately maintaining the final molded form in close contact with the mold part 10. In other words, vibration or shock due to the transfer of the matrix resin and reinforced fiber fabric (f) can be prevented, and the high-temperature compressed air is subsequently injected into the inner space of the air tube (not shown) filled with low-temperature compressed air, and the compressed air Since the internal temperature of the air tube (not shown) can be uniformly raised without deviation for each part due to heat diffusion due to molecular motion and intermolecular heat exchange, curing precision can be significantly improved.

Meanwhile, the step in which the expansion pressure of the air tube (not shown) is controlled is performed on the inlet side of the air tube (not shown) according to the expansion pressure and internal temperature of the air tube (not shown) until the preset curing waiting time has elapsed. It is preferable to include a step of controlling the injection flow rate and the discharge flow rate at the outlet of the air tube (not shown) in conjunction with each other.

In detail, the control unit (not shown) controls the supply flow rate of the high-temperature compressed air and the discharge flow rate of the air tube (not shown) according to the expansion pressure and internal temperature of the air tube (not shown). At this time, the air tube (not shown) is equipped with a temperature sensor (not shown) and a pressure sensor (not shown) signal-connected to the control unit (not shown).

That is, the control unit (not shown) controls the compressed air supply unit (not shown) and the heating means to supply high-temperature compressed air according to the internal temperature of the air tube (not shown) measured through the temperature sensor (not shown). Controls the flow rate and controls the discharge flow rate of the air tube (not shown) by controlling the pressure control valve (not shown) according to the inflation pressure of the air tube (not shown) measured through the pressure sensor (not shown). .

First, when the arrangement of the reinforced fiber fabric (f) and the vacuum bag 20 is completed, the compressed air supply unit (not shown) is driven so that the air tube (not shown) is filled with low-temperature compressed air, and the pressure sensor ( The internal pressure of the air tube (not shown) is measured through (not shown). At this time, when the measured internal pressure increases to correspond to the first internal pressure, the operation of the compressed air supply unit (not shown) is terminated, and the process of injecting the matrix resin and forming a vacuum proceeds.

Then, when the diffusion process due to injection of the matrix resin and vacuum formation is completed, the compressed air supply unit (not shown) is driven to additionally fill the air tube (not shown) with low-temperature compressed air, and the pressure sensor (not shown) The internal pressure of the air tube (not shown) is measured. At this time, when the measured internal pressure increases to correspond to the second internal pressure, the operation of the compressed air supply unit (not shown) is terminated, and the dispersion process of the matrix resin proceeds.

In addition, when the preset dispersion waiting time elapses, the heating means is driven to prepare high-temperature compressed air, and the compressed air supply unit (not shown) is driven to fill the air tube (not shown) with the prepared high-temperature compressed air. . At this time, the internal pressure of the air tube (not shown) is measured through the pressure sensor (not shown). And, the pressure control valve (not shown) is opened and closed so that the internal pressure of the air tube (not shown) is maintained at a value corresponding to the second internal pressure. At this time, the internal temperature of the air tube (not shown) is measured through the temperature sensor (not shown). In addition, the supply of high-temperature compressed air and the opening and closing process of the pressure control valve (not shown) are continuously performed until the internal temperature of the air tube (not shown) becomes higher than the curing temperature. Here, when the process of maintaining internal pressure through supplying high-temperature compressed air and opening and closing the pressure control valve (not shown) so that the internal temperature of the air tube (not shown) is maintained above the curing temperature, the preset curing waiting time elapses. It is carried out continuously until.

Accordingly, the expansion pressure of the air tube (not shown) can be accurately maintained so that the reinforced fiber fabric (f) and the matrix resin are maintained in close contact with the mold portion 10, and the curing of the matrix resin is completed. Since curing heat can be continuously and uniformly supplied until complete curing, high curing quality can be provided beyond the level of supplying curing heat by inserting the mold part 10 into a separate special heating chamber.

Meanwhile, in the step of placing the reinforced fiber fabric (f) and the vacuum bag 20 in the mold part 10, the porous resin absorbent sheet 22 is formed between the reinforced fiber fabric (f) and the vacuum bag 20. Includes placement steps. At this time, the porous resin absorption sheet 22 may be made of a glass fiber material.

In the step of curing the matrix resin, the excess of the injected matrix resin and curing by-products of the matrix resin are formed through the vacuum atmosphere of the sealed space 21 and the expansion pressure of the air tube (not shown). It includes the step of being collected in an absorbent sheet.

At this time, the porous resin absorption sheet refers to a sheet equipped with a mesh sheet or a fine open pore structure such as a flow mat, bleeder, or breather, and is used to cure the matrix resin. By-products refer to additional gas, moisture, foreign substances, etc. generated when the matrix resin, hardener, accelerator, etc. undergo a curing reaction by heat.

Here, since the expansion pressure of the air tube (not shown) is continuously maintained during the curing process of the matrix resin, a continuous processing pressure is applied between the vacuum bag 20 and the mold part 10, which generates pressure during curing of the matrix resin. Curing by-products can be smoothly collected and removed within the porous resin absorption sheet 22, and the molding quality of the process can be further improved.

On the other hand, in the step of placing the reinforced fiber fabric (f) and the vacuum bag 20 in the mold part 10, one end is in close contact with the suction end 41 of the vacuum forming part 40 and the other end is in close contact with the sealed space ( It includes the step of arranging an air bridge portion 50 disposed in contact with the other edge of the reinforced fiber fabric (f) disposed in 21).

In addition, in the step of curing the matrix resin, the remaining mattress resin flows into the air bridge portion 50 and is collected, and at the same time, the gas (a) inside the sealed space 21 flows into the air bridge portion 50. It includes the step of passing through and being sucked into the vacuum forming unit 40.

Here, the air bridge unit 50 delays the inflow of the matrix resin into the vacuum forming unit 40 when the mattress resin is vacuum diffused into the closed space 21, while the gas inside the closed space 21 is The other side of the reinforced fiber fabric (f) is made of a glass fiber material with passing pores, one end of which is in close contact with the suction end 41 of the vacuum forming unit 40, and the other end is disposed in the closed space 21. It is preferable that it is placed in contact with the edge. In addition, it is preferable that a resin discharge delay hole (k) is formed in a curved manner through the air bridge portion 50 and communicates between one end and the other end of the air bridge portion 50.

In addition, the air bridge part 50 is disposed along the free space formed in communication with the sealed space 21 between the edge of the vacuum bag 20 and the edge of the molded part 11, and has both sides of the air bridge part 50. It is closely adhered to the vacuum bag 20 and the forming part 11 by the vacuum pressure formed in the sealed space 21 and the free space by the vacuum forming part 40, and one end of the air bridge part 50 is preferably arranged to cover the entire cross section of the flow path of the suction end 41 of the vacuum forming unit 40. At this time, the free space refers to the space formed between the edge of the vacuum bag 20 where the air bridge part 50 is disposed and the edge of the molded part 11 in FIG. 1.

In addition, the suction end 41 and the reinforcement are maintained so that a vacuum below the process pressure is maintained in the closed space 21 until the mattress resin is cured in the closed space 21 by the vacuum forming unit 40. The fiber fabric (f) is arranged to be spaced apart at a predetermined interval, and the air bridge portion 50 has a predetermined length between one end and the other end and is provided in the form of a flat sheet extending along the width direction. desirable.

Additionally, the air bridge portion 50 may be made of the same material as the resin absorbent sheet 22, and may be provided as a sheet with a fine open pore structure.

Accordingly, the air bridge portion 50 has one end in close contact with the suction end 41 of the vacuum forming portion 40 and the other end disposed on the edge side of the reinforced fiber fabric f disposed in the sealed space 21. ) is made of a porous glass fiber material, so that the discharge of the mattress resin to the vacuum forming part 40 is delayed even until the mattress resin is completely cured, thereby making it possible to continuously maintain the vacuum pressure in the sealed space 21 uniformly. Manufacturing precision can be significantly improved.

In addition, the air bridge portion 50 has both sides in close contact between the rim of the vacuum bag 20 and the rim of the forming portion 11 by vacuum pressure to prevent the inflow of the matrix resin into the vacuum forming portion 40. While delaying, the gas inside the sealed space 21 passes and is discharged, and even if the resin curing speed at each location is different, the vacuum pressure is maintained until all areas of the mattress resin are cured, so the precision of the manufactured product can be significantly improved. there is.

And, as the mattress resin flowing to the suction end 41 of the vacuum forming part 40 passes through the pores of the air bridge part 50 made of glass fiber, that is, the resin discharge delay hole (k), the moving speed increases. Because of the delay, the mattress resin discharged to the resin trap 45 of the vacuum forming unit 40 is minimized until the three-dimensional structure to be molded (S) is cured and manufactured, thereby significantly improving economic efficiency.

In addition, curing by-products generated during curing of the matrix resin are smoothly collected and removed in the porous resin absorption sheet 22 disposed between the reinforced fiber fabric (f) and the vacuum bag 20, thereby improving the molding quality of the process. It can be improved further.

At this time, terms such as “include,” “comprise,” or “equipped” described above mean that the corresponding component may be present, unless specifically stated to the contrary, excluding other components. It should be interpreted as being able to include other components. All terms, including technical or scientific terms, unless otherwise defined, have the same meaning as generally understood by a person of ordinary skill in the technical field to which the present invention pertains. Commonly used terms, such as terms defined in a dictionary, should be interpreted as consistent with the contextual meaning of the related technology, and should not be interpreted in an idealized or overly formal sense unless explicitly defined in the present invention.

As explained above, the present invention is not limited to the above-described embodiments, and modifications and implementations can be made by those skilled in the art without departing from the scope of the claims of the present invention. And such modifications fall within the scope of the present invention.

10: mold part 20: vacuum bag
21: closed space 30: resin injection part
40: Vacuum forming part 50: Air bridge part
100: Integrated three-dimensional structure manufacturing device using high vacuum continuous infusion molding

Claims (5)

A mold portion having a molded portion corresponding to the outer contour of the three-dimensional structure to be molded on one side where the reinforced fiber fabric is disposed;
A vacuum bag tightly coupled along the edge of the molded portion exposed from the reinforced fiber fabric so that the reinforced fiber fabric is placed in a closed space partitioned from the outside;
a resin injection unit connected to one side of the vacuum bag to inject matrix resin into the sealed space so that the reinforced fiber fabric is impregnated;
a vacuum forming unit connected to the other side of the vacuum bag to form a vacuum lower than a preset process pressure in the sealed space so that the injected matrix resin is vacuum diffused; and
The mattress resin in the closed space is made of a glass fiber material having pores through which gas inside the closed space passes for vacuum diffusion, one end of which is in close contact with the suction end of the vacuum forming unit, and the other end is disposed in the closed space. An integrated three-dimensional structure manufacturing device using high vacuum continuous infusion molding including an air bridge portion disposed on the edge of the reinforced fiber fabric. According to claim 1,
Both sides of the air bridge part are in close contact with the edge of the vacuum bag and the edge of the molded part by vacuum pressure,
An integrated three-dimensional structure manufacturing device using high vacuum continuous infusion molding, characterized in that one end of the air bridge portion is arranged to cover the entire cross section of the suction end of the vacuum forming portion. According to claim 1,
The air bridge part is provided as a flat plate having a preset length between one end and the other end so that a vacuum below the process pressure is maintained in the sealed space until the mattress resin is cured in the sealed space by the vacuum forming unit. ,
An integrated three-dimensional structure manufacturing device using high vacuum continuous infusion molding, characterized in that the suction end and the reinforcing fiber fabric are spaced apart at a preset interval. According to claim 1,
Further comprising a porous resin absorption sheet disposed between the reinforced fiber fabric and the vacuum bag,
An integrated three-dimensional structure manufacturing device using high vacuum continuous infusion molding, characterized in that the air bridge portion is made of the same material as the resin absorption sheet. According to claim 1,
The vacuum forming unit
A vacuum pump driven to create vacuum pressure,
A resin trap provided to store the introduced mattress resin,
One end is connected to the suction end, the other end is branched and connected to the vacuum pump and the resin trap, and a first opening/closing valve is provided at one end connected to the suction end, and is provided at a portion connected to the vacuum pump among the other branched ends. An integrated three-dimensional structure manufacturing device using high vacuum continuous infusion molding, characterized by including a branch connector equipped with two on-off valves.