WO2011043253A1 - Procédé et appareil pour produire une matière plastique renforcée par des fibres - Google Patents

Procédé et appareil pour produire une matière plastique renforcée par des fibres Download PDF

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Publication number
WO2011043253A1
WO2011043253A1 PCT/JP2010/067203 JP2010067203W WO2011043253A1 WO 2011043253 A1 WO2011043253 A1 WO 2011043253A1 JP 2010067203 W JP2010067203 W JP 2010067203W WO 2011043253 A1 WO2011043253 A1 WO 2011043253A1
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Prior art keywords
resin
cavity
reinforcing fiber
reinforced plastic
fiber base
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PCT/JP2010/067203
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English (en)
Japanese (ja)
Inventor
関戸俊英
篠田知行
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東レ株式会社
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Priority to JP2010548954A priority Critical patent/JPWO2011043253A1/ja
Publication of WO2011043253A1 publication Critical patent/WO2011043253A1/fr

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28Shaping operations therefor
    • B29C70/40Shaping or impregnating by compression not applied
    • B29C70/42Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
    • B29C70/46Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs
    • B29C70/48Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs and impregnating the reinforcements in the closed mould, e.g. resin transfer moulding [RTM], e.g. by vacuum

Definitions

  • the present invention relates to a method and an apparatus for manufacturing a fiber reinforced plastic (hereinafter sometimes abbreviated as FRP (abbreviated as “Fiber Reinforced Plastic”)), in particular, an ultra-large size of several meters to several tens of meters and a thickness of several millimeters.
  • FRP fiber Reinforced Plastic
  • a thick FRP molded product with a thickness of several tens of millimeters can be molded with a simple device, and the fiber volume content of the molded product (hereinafter sometimes abbreviated as Vf) can be controlled relatively easily and easily.
  • Vf fiber volume content of the molded product
  • the present invention relates to a method and an apparatus for manufacturing a fiber reinforced plastic suitable for manufacturing an ultra-large structure that requires high quality such as a wind turbine part.
  • a reinforcing fiber base for example, a laminate of reinforcing fiber fabrics
  • the die is pressed by pressing the die. Tighten and inject the pressurized matrix resin into the reinforcing fiber base material and impregnate it while adjusting the height of the internal dimensions of the cavity so that the thickness of the reinforcing fiber base material is equal to the predetermined thickness of the molded product
  • RTM ResinReTransfer Molding
  • pressure RTM pressure
  • a bag material for example, a bag film
  • the matrix resin is injected into the interior to impregnate the reinforcing fiber base
  • An RTM molding method using a bag material in which an impregnated resin is cured is known.
  • a method of applying pressure by fluid pressure from the outside of the bag material after resin impregnation is also known (for example, Patent Document 2).
  • Vf is controlled by sucking and removing excess resin in the reinforcing fiber base from a suction line arranged inside the bag material (in some cases, using an injection line).
  • a suction line arranged inside the bag material
  • the reinforcing fiber base is already pressurized at the time of resin injection and impregnation, so that the reinforcing fiber density of the reinforcing fiber base is increased, and the resin is used as the reinforcing fiber. Since it becomes difficult to flow in the base material and the impregnation property of the resin is deteriorated, in order to achieve a predetermined resin impregnation state, the thickness of the reinforcing fiber base material and thus the molded product is limited.
  • the thickness of the reinforcing fiber base is basically equal to or close to that of the molded product (after being preformed), placed on the lower mold, covered with the bag material, and sealed with the bag material.
  • This is a method of reducing the pressure by suction and injecting and impregnating the resin using the reduced pressure state, so when trying to mold a molded product having a relatively high Vf or a molded product having a relatively large thickness,
  • the reinforcing fiber base having a relatively high reinforcing fiber density and a relatively large thickness must be impregnated in advance, and it may be difficult to impregnate a predetermined resin in the entire thickness direction.
  • Vf the degree of the increase in Vf at the stage of the reinforcing fiber base, and thus the molded product.
  • the upper limit value of Vf in this method depends on the thickness, it is at most about 50 to 52% in order to achieve a predetermined stable and uniform resin impregnation. If the Vf cannot be increased (for example, 55% or more), there is a limit in increasing the strength and elastic modulus of the molded product due to the use of the reinforcing fiber, which may not be recognized as a desired product. Arise.
  • the object of the present invention is to obtain a high-quality molded product that can sufficiently exhibit the high strength and high elasticity characteristics of the reinforcing fiber by controlling to a high Vf, particularly when manufacturing a very large and thick molded product.
  • the resin can be easily impregnated in a desired state without using expensive pressure equipment such as an autoclave or a highly rigid upper and lower mold, and in a short time.
  • An object of the present invention is to provide a method and an apparatus for producing a fiber reinforced plastic which can be impregnated with a resin and have excellent molding workability.
  • a method for producing a fiber reinforced plastic according to the present invention includes a reinforcing fiber base disposed in a cavity formed by an upper mold and a lower mold, and the matrix resin is reinforced after sealing the cavity.
  • the height of the inner dimension of the cavity is larger than the thickness of the predetermined molded product.
  • the matrix resin is injected into the reinforcing fiber base material and impregnated, and then, at least one of the upper mold and the lower mold is pressed toward the other, and the resin is excessively injected and impregnated into the reinforcing fiber base material.
  • the height of the inner dimension of the cavity is set so that the thickness of the reinforcing fiber base disposed in the cavity becomes the thickness of the predetermined molded product. Controls on so that, in that state, consisting of wherein the curing the matrix resin.
  • the upper mold and the lower mold have a shape capable of forming a substantially uniform cavity, and are not like a bag film.
  • the fiber reinforced plastic manufacturing method includes a reinforcing fiber substrate disposed in a cavity formed by at least an upper mold and a lower mold, and the cavity is sealed.
  • a method for producing a fiber reinforced plastic in which a matrix resin is injected and impregnated into a reinforced fiber base material, and then the resin is cured, the reinforced fiber is formed so that a gap is not substantially formed between the upper mold and the lower mold.
  • the matrix resin is injected into the cavity from the impregnation of the reinforcing fiber base material, and after the impregnation of the reinforcing fiber base material is completed, excessive injection and impregnation of the reinforcing fiber base material are performed.
  • Reinforced fiber base material disposed within the cavity by sucking and removing the resin and pressurizing at least one of the upper mold and the lower mold toward the other.
  • the method is characterized in that the thickness is controlled to be the thickness of a predetermined molded product, and the matrix resin is cured in that state.
  • Resin may be cured by heating when the matrix resin is a thermosetting resin.
  • the reinforcing fiber base material can be formed into a preform having a shape along the molded product in advance before being placed in the cavity, the preform can also be used.
  • many reinforcing fiber layers for example, many reinforcing fiber fabric layers, many unidirectional reinforcing fiber sheet layers, many reinforcing fiber fabric layers and unidirectional reinforcement. In many cases, it is difficult to obtain a preform form because the reinforcing fiber base material is often formed by laminating fiber sheet layer combinations).
  • the reinforcing fiber base material is disposed in the cavity.
  • a reinforcing fiber base having a thickness corresponding to Vf that is relatively lower than Vf after molding is placed in a cavity in a state where the height of the inner dimension is increased, Since the matrix resin is injected and impregnated into the reinforcing fiber base material, the reinforcing fiber base material having a relatively large thickness and an extremely large reinforcing fiber base material has a low Vf and a relatively low resin flow resistance. It is possible to sufficiently impregnate the resin. However, at this stage, the thickness of the reinforcing fiber base is larger than the thickness of the target molded product, and Vf is also lower than Vf of the target molded product.
  • the excess resin is sucked and removed, and at the same time, at least one of the upper mold and the lower mold is pressurized toward the other, so that the cavity has a predetermined height.
  • the thickness of the reinforcing fiber base material impregnated with the resin is controlled to the thickness of the predetermined molded product. Therefore, at this stage, while the state where the reinforcing fiber base is sufficiently impregnated with the resin is maintained, the excess resin is removed along with the reduction of the reinforcing fiber base thickness, and the dimensions of the target molded product, In particular, the target thickness of the molded product is controlled, and the target high Vf state is achieved.
  • the molded product to be manufactured is also in a stable and uniform high Vf state, and is of a desired high quality having high strength and high elastic modulus even if it is very large and thick.
  • a fiber-reinforced plastic molded product will be obtained.
  • the upper mold and the lower mold have shapes that can form a substantially uniform cavity, and the height of the inner dimension of the cavity is, for example, the height of a spacer described later. By controlling the above, even when the mold is pressurized, a substantially uniform height can be maintained. Further, in the method according to the present invention, since no bag material is used for molding, the molding cycle can be shortened and workability for molding is greatly improved.
  • the pressurizing die does not require great strength and rigidity, and an inexpensive and simple low-rigidity die can be used as the pressurizing die. As a result, it is possible to simplify manufacturing equipment and reduce costs.
  • the inside of the cavity is vacuumed and decompressed, and the matrix resin is removed from the place communicating with the cavity. It is possible to inject and impregnate the reinforcing fiber substrate using a differential pressure between the atmospheric pressure and the cavity internal pressure.
  • the reinforcing fiber base placed on the mold is covered with a bag material (for example, bag film), the inside is depressurized by vacuum suction, and the matrix resin is injected into the reinforcing fiber base using the reduced pressure state.
  • the bag is made of a low-rigidity material such as a film
  • the degree of thickness reduction varies depending on the location, and the thickness of the molded product varies depending on the location.
  • the height of the inner dimension of the cavity is kept larger than the thickness of a predetermined molded product.
  • the reinforcing fiber base material using the bag material as described above The matrix resin is injected into the reinforcing fiber base in a state where no pressing force is applied to the side, that is, the reinforcing fiber base is not excessively compacted and is maintained in a state corresponding to low Vf.
  • the matrix resin is sufficiently satisfactorily impregnated throughout, and the inside of the cavity is sucked and depressurized, and the matrix resin is reinforced by using the differential pressure between the atmospheric pressure and the cavity internal pressure.
  • the method of injecting and impregnating it is possible to achieve good resin impregnation with a uniform Vf over the entire target without an unimpregnated portion even for a thick substrate or an ultra-large substrate.
  • the thickness can be reduced uniformly throughout the entire bag, so that there is no problem that the thickness varies depending on the location even in a wide molded product.
  • the matrix resin can be injected into the reinforced fiber substrate through a plurality of resin injection paths. That is, the matrix resin can be injected into the reinforcing fiber base almost simultaneously through a plurality of resin injection paths arranged in the surface direction of the reinforcing fiber base.
  • the member for providing the plurality of resin injection paths is not particularly limited, and can be provided, for example, in an upper mold or a resin injection plate described later.
  • the matrix resin is injected into the reinforcing fiber substrate almost simultaneously through the plurality of resin injection paths while diffusing the matrix resin in a direction along the surface of the reinforcing fiber substrate.
  • the resin can be injected in a shorter time, and the reinforcing fiber base material can be more uniformly impregnated with the resin.
  • a resin injection plate is formed so that a gap is not substantially formed between one of the upper mold and the lower mold and the reinforcing fiber base. And / or a resin diffusion medium is interposed, the resin injection plate and / or the resin diffusion medium are communicated with the plurality of resin injection paths, and the matrix resin is injected into the reinforcing fiber base through the plurality of resin injection paths. It is desirable to do so.
  • the resin injection plate may be used as an upper mold, but may be configured separately from the mold to be pressurized, as shown in an embodiment described later. By making it separate, it is possible to further simplify the pressed mold itself.
  • the resin injection plate has a plurality of resin diffusion paths communicating with at least one resin injection path and an opening in the resin diffusion path. It is also possible to form a resin injection port and impregnate the reinforcing fiber base material from the resin injection port via a plurality of resin diffusion paths.
  • the resin diffusion medium has a network structure, and the matrix resin can be diffused in a direction along the surface of the reinforcing fiber substrate through the network structure.
  • the plurality of resin injection paths can be used not only for injecting resin, but also for sucking and removing excessively injected and impregnated resin into the preform. That is, it can be used for injection, suction, and removal by switching the same passage. Excessly injected and impregnated resin is also sucked and removed from the vacuum suction port, but the resin injection path and injection port are arranged over a wide area or the entire surface of the preform, so it is more efficient than the vacuum suction port. The excessively injected and impregnated resin can be sucked and removed.
  • a pressure reducing means by vacuum suction is provided in advance in the resin injection line, and the pressure reducing means is not used during the impregnation of the matrix resin into the reinforcing fiber base.
  • the resin injection line is closed, and a method of sucking and removing the resin excessively impregnated into the reinforcing fiber base using a decompression means can be adopted.
  • the height of the internal dimension of the cavity is kept larger than the thickness of the predetermined molded product, and the height of the internal dimension of the cavity is controlled to be small after resin injection and impregnation.
  • spacers are arranged around the cavity, particularly between the upper mold and the lower mold.
  • a spacer is placed between the upper mold and the lower mold to determine the height of the internal dimension of the cavity to a predetermined initial height.
  • the spacer is separated from the sealing mechanism outside the cavity between the upper mold and the lower mold.
  • the height of the cavity internal dimension is disposed within the cavity.
  • the thickness of the reinforcing fiber base can be controlled to be a predetermined thickness of the molded product. By interposing such a spacer, the thickness of the reinforcing fiber substrate is more reliably maintained at a predetermined large value that can be easily impregnated with the resin at the time of resin injection and impregnation. It can control to become the thickness of a molded article.
  • Such a height adjustment of the spacer is made up of a relatively rigid member separate from the sealing means interposed between the upper die and the lower die around the cavity.
  • the height can be adjusted by a dedicated height adjustment mechanism, and the spacer is composed of, for example, a rubber-like elastic body interposed between the upper mold and the lower mold, and the rubber-like elastic body Use the thickness change due to elastic deformation, or use a hollow elastic body, inject fluid into the hollow elastic body, change the volume and pressure of the fluid, and adjust the height of the spacer You can also These height adjustment methods for both spacers can be used in combination.
  • a commercially available bolt can be used for the height adjustment method.
  • a tap female screw
  • a bolt is inserted while being screwed therein, and the height of the bolt protruding from the surface of the lower die is used as the height of the spacer.
  • the height adjustment method using a bolt is preferable because fine adjustment can be easily performed by the amount of rotation of the bolt.
  • the height adjustment method using bolts may be either inside or outside the sealing mechanism of the upper and lower molds, but if there is no particular restriction, it can be provided outside the sealing mechanism. This is preferable because the matrix resin does not flow into the bolt and the tap portion.
  • the spacer When the spacer is made of a rubber-like elastic body, the amount of deformation of the spacer can be adjusted by adjusting the degree of decompression in the cavity, and the height of the spacer can be adjusted through adjustment of the amount of deformation of the spacer. .
  • the height of the spacer can be adjusted by adjusting the pressure applied to the spacer by the differential pressure between the atmospheric pressure applied outside the cavity and the reduced pressure inside the cavity by adjusting the degree of pressure reduction inside the cavity. . Therefore, in this case, the pressure applied toward at least one of the upper mold and the lower mold can be adjusted by the degree of decompression in the cavity.
  • the spacer when the spacer is made of a rubber-like elastic body, the spacer can also serve as a sealing means interposed between the upper mold and the lower mold.
  • cylinder means is used to inject the resin into the reinforcing fiber base and pressurize toward the other of at least one of the upper mold and the lower mold after impregnation. It can also be performed by applying pressure toward the mold. In this method, the applied pressure can be easily controlled by adjusting the pressure of the pressurized fluid to the cylinder means. As described above, since this pressurization is performed together with the suction and removal of the excess resin, a large pressure is not required, and therefore, for example, a relatively low pressure (for example, 0.1 MPa or less) is used without using a large hydraulic cylinder or the like. An air cylinder or the like that uses compressed air can be used.
  • the bladder bag can be made of various materials, and may be a simple rubber bag, a fabric-coated bag, or a hybrid state of a rubber bag and a fabric-like bag.
  • a flat plate as the bladder bag, and to pressurize at least one of the upper die and the lower die substantially in a planar shape with substantially no gap.
  • a predetermined molded product is obtained by a mechanism having a sealing function between the upper mold and the lower mold provided outside the cavity and a height adjusting function of the cavity.
  • the matrix resin is injected and impregnated into the reinforcing fiber base material, and then at least one of the upper mold and the lower mold is moved toward the other to be predetermined. It is also possible to adjust the thickness of the molded article and to suck and remove the resin that has been excessively injected and impregnated into the reinforcing fiber base, and to cure the matrix resin in that state.
  • the positional relationship between the upper mold and the lower mold after controlling the height of the inner dimension of the cavity.
  • the positional relationship between the upper mold and the lower mold is fixed, the cavity is also fixed to a predetermined size, and the resin is cured in this state, so that a molded product having a target dimension is surely formed.
  • a clamp means having a simple structure can be used. That is, the upper die and the lower die may be sandwiched from above and below by the clamping means, and the positional relationship between the upper die and the lower die may be fixed against the separation force of the upper and lower die due to the cavity internal pressure.
  • the apparatus for producing fiber-reinforced plastic according to the present invention is an apparatus used in the above method.
  • the height of the inner dimension of the cavity is kept larger than the thickness of a predetermined molded product during the resin injection impregnation, and after the resin injection impregnation, pressurization of the mold and suction of excess resin, Since the height of the inner dimension of the cavity is reduced to a predetermined thickness by the removal, it is necessary that the height of the inner dimension of the cavity can be adjusted in at least two stages.
  • the height of the cavity internal dimension is controlled by adjusting the height of a relatively rigid spacer different from the sealing means around the cavity, and the sealing means arranged around the cavity.
  • elastic deformation which can also serve as the spacer. Both of these methods can be used in combination.
  • the present invention provides the following fiber-reinforced plastic manufacturing apparatus. That is, the apparatus for producing a fiber reinforced plastic according to the present invention is an apparatus used in the above-described method, and the height of the inner dimension of the cavity is between the upper mold and the lower mold and around the cavity. It has a height adjusting means capable of adjusting the distance between the corresponding upper mold and lower mold in at least two stages of the distance at the time of the resin injection and impregnation and the distance at the time of the resin curing. Become.
  • the height adjusting means is composed of means having a spacer capable of adjusting the distance between the upper mold and the lower mold by adjusting the vertical position of the upper mold and the lower mold.
  • the height adjusting means can be configured to include a sealing means that can seal the cavity and adjust the distance between the upper mold and the lower mold by its own elastic deformation.
  • both types of height adjusting means can be provided.
  • a string-like rubber capable of adjusting its own thickness can be used as the sealing means.
  • this string-like rubber for example, an O-ring can be used.
  • a height adjustment mechanism using bolts can be adopted, and commercially available bolts can also be used.
  • a tap female screw
  • the height adjustment mechanism using a bolt is preferable because it can be easily finely adjusted by the amount of rotation of the bolt.
  • the height adjustment mechanism using bolts may be either inside or outside the sealing mechanism of the upper mold and the lower mold, but if there is no particular restriction, it can be provided outside the sealing mechanism. This is preferable because the matrix resin does not flow into the bolt and the tap portion.
  • the fiber reinforced plastic manufacturing apparatus a configuration in which the ratio of the bending rigidity between the upper mold and the lower mold is 10 times or more can be adopted. That is, one of the upper die and the lower die requires a high rigidity that does not impair the target shape in order to mainly determine the shape of the final cavity for molding, but the other die is pressurized.
  • the mold only needs to be configured so that the height of the inner dimension of the cavity can be adjusted in at least two stages as described above, and can be much lower in rigidity than a highly rigid mold. Therefore, it becomes possible to give a rigidity difference of 10 times or more between both molds, and by constructing one mold with low rigidity, the mold can be manufactured easily and inexpensively, That type of pressurizing operation and pressurizing apparatus can be simple.
  • one of the upper mold and the lower mold is a plate-like low-rigidity mold having a surface portion that conforms to the surface shape of the molded product on the reinforcing fiber substrate side. Even if it is a simple plate-like low-rigidity type, it is possible to maintain the desired internal cavity height as described above at the time of resin injection impregnation. As long as the height can be reduced to the target height, the target molding in the present invention becomes possible.
  • a C-shaped or H-shaped mold material may be assembled in the shape of a shoji as a plate-shaped mold, and the plate-shaped mold may be reinforced from the back surface.
  • This is a feature of the present invention.
  • the low rigidity type (simple type) with a low rigidity and a simple structure.
  • the low-rigidity mold itself is slightly bent (even if it is slightly bent, this bending is completely applied to the other member like a bag film. This is basically different from the deformation to the shape following the above).) Since the shape of the resin injection plate located on the reinforcing fiber substrate side only needs to be kept in a predetermined shape, this also makes the structure simpler. It becomes possible to constitute a low-rigidity type.
  • the mold on the pressurized side can be maintained at a desired height of the cavity internal dimension when the resin is injected and impregnated. There is no need to generate an unnecessary pressure at that time.
  • the pressurization of the mold is performed together with suction and resin removal from the cavity for removing excess resin, so that a large pressure is not required.
  • Such a low-rigidity type can be made of metal, but as the low-rigidity type, for example, a type made of fiber-reinforced plastic can also be used. In some cases, non-reinforced resin, wood, ceramic, or a hybrid structure thereof may be used.
  • the linear expansion coefficient of the mold and the fiber reinforced plastic to be molded can be made substantially the same. This is preferable because the dimensional accuracy of the plastic can be improved. It is more preferable especially when the size of the fiber reinforced plastic to be molded is large.
  • the reinforcing fiber used for the reinforcing fiber base in the fiber-reinforced plastic manufacturing method and apparatus according to the present invention is not particularly limited, and includes carbon fibers, other reinforcing fibers such as glass fibers and aramid fibers, and these reinforcing fibers.
  • the combination configuration can be used.
  • the carbon fibers themselves exhibit high rigidity. Therefore, when the density of the reinforcing fibers is high or the thickness of the reinforcing fiber base is large, there is a possibility that the resin impregnation may not be achieved. In this case, the present invention is preferable.
  • the inner dimensions of the cavity formed by the upper mold and the lower mold for example, by controlling the height of the spacer, even when the mold is pressurized.
  • the resin is injected and impregnated in a state where the thickness of the reinforcing fiber base is adjusted to a thickness corresponding to low Vf that can be completely impregnated with the resin, by maintaining the height of the predetermined uniform height, while adjusting the height of the inner dimension of the cavity to a height corresponding to the thickness of the predetermined fiber reinforced plastic by pressurizing the mold and controlling the height of the spacer, the excess resin in the reinforcing fiber base is sucked and removed, Since the resin is cured in a state corresponding to high Vf, it becomes possible to form a large molded product with high Vf in a short time with a simpler pressurization equipment and mold than conventional ones.
  • the resin can be injected and impregnated more efficiently, and the simplification of the mold can be further promoted.
  • surplus resin in the reinforcing fiber base can be obtained through the resin injection plate. Can be efficiently sucked and removed, so that the whole apparatus can be further simplified.
  • a resin injection plate resin injection and impregnation are completed in a short time, In addition, the desired high Vf state can be reached, and the molding workability and productivity can be greatly improved.
  • FIG. 1 shows a state at the time of resin injection in a manufacturing apparatus used in a method for manufacturing a fiber reinforced plastic according to an embodiment of the present invention.
  • the fiber reinforced plastic manufacturing apparatus 1 has an upper mold 2 and a lower mold 3, and a cavity 4 is formed by the upper mold 2 and the lower mold 3. More precisely, in this embodiment, the resin injection plate 5 is disposed immediately below the upper mold 2, and the cavity 4 is formed by the resin injection plate 5 and the lower mold 3.
  • a reinforcing fiber base 6 made of a laminate of reinforcing fiber fabrics is disposed in the cavity 4.
  • an O-ring 7 is provided around the cavity 4 as a sealing means extending over the entire circumference, and the cavity 4 is sealed via the O-ring 7.
  • a spacer 8 is interposed outside the O-ring 7 and between the upper mold 2 and the lower mold 3, and the spacer 8 is connected to a spacer height adjusting mechanism 9. The spacer 8 adjusts its own height position by the spacer height adjusting mechanism 9 so that the height of the inner dimension of the cavity 4 formed by the resin injection plate 5 and the lower mold 3 as described above (in FIG. 1).
  • the height H) can be adjusted, and through the height adjustment, the thickness of the reinforcing fiber base 6 disposed in the cavity 4 is set to the thickness at the time of resin injection impregnation and the resin. It can be controlled to a thickness corresponding to the thickness of a predetermined molded product that is reduced after the impregnation by injection.
  • the matrix resin 11 accommodated in the resin pot 10 enters the cavity 4 via the resin injection port 12 formed in the upper mold 2 and the resin injection line 25 connected to the resin injection port 12.
  • the reinforcing fiber base 6 is injected and impregnated, but when the resin is injected and impregnated, the height H of the inner dimension of the cavity 4 is maintained larger than the thickness of the predetermined molded article by the spacer 8. Is done. Therefore, the matrix resin 11 is injected into the reinforcing fiber base 6 in a state where the thickness of the reinforcing fiber base 6 is larger than the thickness of the predetermined molded product (that is, a state of Vf lower than Vf of the predetermined molded product). And impregnated.
  • the vacuum pump 13 sucks the inside of the cavity 4 through the vacuum suction port 15 formed in the lower mold 3 through the resin trap 14 and sucks the matrix resin 11 using the decompressed state. Is injected and impregnated into the reinforcing fiber base 6.
  • the matrix resin 11 can be injected under pressure, and the injection using the reduced pressure state and the pressure injection can be used in combination.
  • the matrix resin 11 injected through the resin injection port 12 is diffused in the resin diffusion path 16 formed in the resin injection plate 5 in a direction along the surface of the reinforcing fiber base 6, and the resin.
  • the resin injection plate 5 preferably has a resin diffusion path 16 through which the matrix resin injected from the resin injection port 12 is led to the resin injection path 17.
  • the material of the resin injection plate 5 is preferably metal, fiber reinforced plastic, or thermoplastic resin.
  • the resin diffusion path 16 should be appropriately designed according to the size and shape of the fiber reinforced plastic to be molded, but it is preferable that both the width and the depth are several mm to several tens mm.
  • the thickness of 3 mm to 20 mm is preferable because the amount of resin remaining in the diffusion path can be reduced while maintaining the resin diffusibility.
  • the material of the resin injection plate 5 is the same as the material used for molding because the linear expansion coefficient can be made the same.
  • the plurality of resin injection paths 17 are preferably distributed substantially over the entire surface of the reinforcing fiber base 6.
  • FIG. 1 shows a state in which the impregnation of the matrix resin 11 has progressed to some extent in the thickness direction of the reinforcing fiber base 6.
  • the matrix resin 11 is impregnated throughout the reinforcing fiber base 6 in the thickness direction of the reinforcing fiber base 6, and after the impregnation is completed, the resin flows out from the vacuum suction port 15.
  • the thickness of the reinforcing fiber base 6 is larger than the target thickness of the molded article having a high Vf. In this state, although the matrix resin 11 is not yet cured, Vf in this state is lower than Vf of the target molded product having a high Vf.
  • the density of the reinforcing fiber is lower than the target reinforcing fiber density of the molded product having a high Vf, and the resin easily flows in the reinforcing fiber base 6, the relatively thick reinforcing fiber base 6 is used.
  • the matrix resin 11 is sufficiently satisfactorily impregnated without applying a high injection pressure. That is, first, although in the low Vf state, the reinforcing fiber base 6 is easily and sufficiently satisfactorily impregnated with the matrix resin 11.
  • the matrix fiber 11 is sufficiently satisfactorily impregnated into the reinforcing fiber base 6 in such a low Vf state, it is added to the resin vacuum suction line 18 used as described above, as shown in FIG.
  • the resin injection line side is also switched to a vacuum suction line 21 having a vacuum pump 19 and a resin trap 20 (which can also be used as the vacuum pump 13 and the resin trap 14) by operating the valve 22 and strengthened. Resin that is excessively injected and impregnated into the fiber base 6 is sucked and removed.
  • the upper mold 2 and the resin injection plate 5 are pushed down by utilizing the pressure difference between the internal pressure of the cavity 4 reduced by vacuum suction and the atmospheric pressure applied to the outer surface of the upper mold 2, and the upper mold 2.
  • the pressurization of the reinforcing fiber base 6 can be performed using only the differential pressure between the atmospheric pressure and the internal pressure of the cavity 4 reduced in pressure as described above, but separately or in addition to this, As indicated by a two-dot chain line in FIG.
  • the upper die 2 is pressurized toward the lower die 3 by, for example, cylinder means 23 (for example, an air cylinder), and the height of the inner dimension of the cavity 4 is increased in the cavity 4. It is also possible to control so that the thickness of the reinforcing fiber base 6 disposed on the sheet becomes the thickness of a predetermined molded product. In this way, the thickness of the reinforcing fiber base 6 is set to the thickness of the predetermined molded product, and the excess resin is removed by suction, whereby the Vf of the resin-impregnated reinforcing fiber base 6 is increased, and the target high Vf It is said.
  • cylinder means 23 for example, an air cylinder
  • the matrix resin 11 impregnated in the reinforcing fiber base 6 is cured.
  • a thermosetting resin for example, epoxy resin
  • the matrix resin 11 is cured by heating.
  • a known means such as a heater or a heat medium may be used as the heating means.
  • the matrix resin 9 impregnated in the reinforcing fiber base 6 maintained at the predetermined thickness of the molded product is cured, whereby a target high Vf fiber reinforced plastic molded product 24 is obtained.
  • the mold may be opened and the molded product 24 taken out.
  • the resin injection plate 5 is used in this embodiment, the upper mold 2 can be a simple mold. Further, not only the pressurization for the thickness control but also the suction removal of the excess resin, and hence the suction to the cavity 4 side, are used together. Therefore, a high pressurizing force is not required for the upper mold 2.
  • the upper die 2 is 10 times or more than the lower die 3
  • a mold having low rigidity in particular, in the above embodiment, the shape of the cavity 4 may be determined via the resin injection plate 5 positioned immediately below the upper mold 2, so that the upper mold 2 may be a simple plate-like low-rigidity type.
  • a plate-shaped mold having a surface portion having a shape along the surface shape of the molded product on the 6 side is sufficient. As a result, it is possible to perform desired molding while suppressing facility costs.
  • FIG. 3 and FIG. 4 show a state when resin is injected in a manufacturing apparatus used in a method for manufacturing a fiber reinforced plastic according to another embodiment of the present invention.
  • the O-ring 7 as the sealing means and the spacer 8 for maintaining and controlling the height of the inner dimension of the cavity 4 are configured as different members, but the fiber-reinforced plastic manufacturing apparatus 31 shown in FIG.
  • the spacer 32 is composed of a rubber-like elastic body interposed between the upper mold 2 and the lower mold 3, and the height of the spacer 32 is obtained by utilizing a thickness change due to elastic deformation of the rubber-like elastic body.
  • the spacer 32 also serves as a sealing means interposed between the upper mold 2 and the lower mold 3.
  • a resin diffusion medium 42 is interposed between the resin injection plate 5 and the reinforcing fiber base 6, and the resin diffusion medium 42 is interposed.
  • the resin diffusion medium 42 is preferably a medium in which the flow resistance of the resin is a low resistance of 1/10 or less compared to the flow resistance in the case of flowing through the reinforcing fiber base 6, and specifically, polyethylene or polypropylene resin.
  • a mesh woven fabric having a mesh opening of # 400 or less is preferable.
  • FIG. 5 shows how the apparatus 41 shown in FIG. 4 sucks and removes the excess resin after the matrix resin is injected and impregnated in the same manner as shown in FIG. Since other configurations are the same as those shown in FIGS. 1 and 2, the same reference numerals as those shown in FIGS.
  • the amount of compressive elastic deformation of the spacer 32 itself made of a rubber-like elastic body is adjusted by, for example, adjusting the degree of decompression in the cavity 4, and the amount of deformation of the spacer 32 is adjusted.
  • the height of the spacer 32 is adjusted.
  • the applied pressure toward the lower mold 3 of the upper mold 2 is adjusted by the degree of decompression in the cavity 4.
  • the thickness is controlled to the thickness H ′ at the time of suction and removal of the surplus resin after the resin injection impregnation so as to be the thickness of the product.
  • the spacer 32 also has a function of the sealing means, and the thickness adjustment of the predetermined reinforcing fiber base 6 is performed through the height adjustment of the spacer 32 itself.
  • the entire structure of the molding apparatus is further simplified. Other actions and effects are in accordance with the embodiment shown in FIGS.
  • FIG. 6 shows a fiber reinforced plastic manufacturing apparatus 51 according to another embodiment using a bladder bag for pressurization of the above mold.
  • a plurality of pradder bags 52 are arranged on the side opposite to the cavity 4 of the lower mold 3, and pressurized fluid (for example, compressed air) is introduced into the pradder bags 52 so that the pradder bags 52 are disposed.
  • pressurized fluid for example, compressed air
  • type 2 is illustrated by expanding the lower mold
  • an upper die fixing jig 53 is used to fix the position of the upper die 2.
  • the excess resin is sucked and removed through the vacuum suction line 21. Since other configurations are the same as those shown in FIGS. 1 and 2, the same reference numerals as those shown in FIGS.
  • the position of the upper mold and the lower mold is fixed in a predetermined relationship when the resin is cured. It is preferable to keep.
  • clamping means can be used to fix the positional relationship between the upper mold and the lower mold.
  • the clamp means can be composed of a clamp 61 that sandwiches the upper mold 2 and the lower mold 3 from above and below. The positional relationship between the upper mold 2 and the lower mold 3 may be fixed against the mold separation force.
  • Carbon fiber fabric A unidirectional reinforcing fiber fabric using carbon fibers as reinforcing fibers.
  • the basis weight of the carbon fiber is 600 g / m 2 .
  • Glass fiber fabric A triaxial fabric using glass fibers as reinforcing fibers.
  • the orientation angle of the reinforcing fiber is ⁇ 45/0 °, and the basis weight of the glass fiber is 900 g / m 2 .
  • Matrix resin A two-component curable epoxy resin. 80 ° C x 15 hours curing type.
  • Example 1 This will be described with reference to FIG. 50 carbon fiber fabrics having a width of 350 mm and a length of 20 m were laminated on a metal lower mold. Peel ply (a resin-permeable layer disposed between the carbon fiber fabric and the resin diffusion medium in order to easily peel the resin diffusion medium from the molded product after molding), the resin diffusion medium, and the carbon fiber fabric laminate. It arrange
  • the resin injection plate has a shape that covers the entire surface of the laminate of carbon fiber fabric made of polypropylene, and resin diffusion paths 16 and holes 17 for resin injection are provided in a grid at intervals of 150 mm.
  • the upper mold made of FRP was placed on the resin injection plate.
  • the upper mold has a shape covering the carbon fiber woven laminate, peel ply, resin diffusion medium, and resin injection plate, and can be sealed with the lower mold through a rubber O-ring arranged in the lower mold. .
  • the spacer arranged outside the O-ring, the inside of the cavity sealed by the upper mold and the lower mold was decompressed using a vacuum pump from the vacuum suction port.
  • the spacer has a height adjusting mechanism using jack bolts.
  • a female screw (tap) is provided in a lower die, and a bolt is screwed therein, and a bolt height protruding from the lower die can be adjusted by a screwing amount of the bolt.
  • This spacer is adjusted so that the height H of the inner dimension of the cavity is 37 mm when the upper die is pressed toward the lower die.
  • H 37 mm
  • the matrix resin in the resin pot was injected from the resin injection port, and the carbon fiber woven fabric was impregnated through the resin injection plate and the resin diffusion medium. Completion of impregnation of the matrix resin into the laminate of the carbon fiber fabric was judged by confirming that the matrix resin was discharged from the vacuum suction port.
  • the injection of the matrix resin is stopped, the resin injection port is connected to the vacuum suction port, and in addition to the original vacuum suction port, the carbon fiber fabric is also fed from the resin injection port.
  • the matrix resin excessively injected into the laminate was sucked and removed.
  • the spacer height adjusting mechanism was rotated to lower the height of the spacer so that the height H ′ of the inner dimension of the cavity was 30 mm.
  • the O-ring collapses, and the upper mold finally has a high inner dimension of the cavity.
  • the fiber fabric was lowered until it reached a predetermined thickness of 30 mm.
  • the carbon fiber reinforced plastic was demolded. As a result of cutting the carbon fiber reinforced plastic and observing the cross section, no defects such as resin non-impregnated portions and voids were found. Further, the thickness of the carbon fiber reinforced plastic was measured at a total of 20 points every 1 m in the longitudinal direction, and as a result, it was confirmed that it was within the range of 30.0 ⁇ 1.0 mm. Further, the volume content Vf of the reinforcing fiber was measured in accordance with ASTM D 3171-99. As a result, it was confirmed that a high Vf could be achieved.
  • Example 2 This will be described with reference to FIG. 50 glass fiber fabrics having dimensions of 1500 mm width and 30 m length were laminated on a metal lower mold. The peel ply and the resin diffusion medium were arranged on the entire surface of the glass fiber fabric laminate, and a resin injection plate was further arranged thereon.
  • the resin injection plate has a shape that covers the entire surface of the laminate of carbon fiber woven fabric made of polypropylene, and holes for resin injection are provided in a grid pattern at intervals of 150 mm.
  • the upper mold made of FRP was placed on the resin injection plate.
  • the upper mold is a shape that covers the laminated body of glass fiber fabric, peel ply, resin diffusion medium, and resin injection plate, and can be sealed with the lower mold through a rubber spacer arranged in the lower mold. .
  • the inside of the cavity sealed by the upper mold and the lower mold was decompressed using a vacuum pump from the vacuum suction port.
  • the spacer can be sufficiently deformed by pressurization, has a sealing function between the upper mold and the lower mold, and also has a function of adjusting the inner dimension height of the cavity between the upper mold and the lower mold.
  • the thickness of the spacer is such that the height H of the inner dimension of the cavity is 40 mm when the inside of the cavity sealed by the upper mold and the lower mold is depressurized by vacuum suction and the upper mold is pressurized toward the lower mold. Adjusted. For this reason, the height of the inner dimension of the cavity was kept constant.
  • a bladder bag was placed under the lower mold, and the upper mold was fixed with the upper mold fixing jig.
  • a hose having a diameter of about 150 mm that does not leak compressed air was used, and the hose was expanded by putting compressed air into the hose.
  • the pressure of the bladder bag was adjusted so that the height H of the inner dimension of the cavity was 40 mm.
  • the matrix resin was pressurized to a pressure of 0.3 MPa, injected from a resin injection port, and impregnated into a laminated body of glass fiber fabrics through a resin injection plate and a resin diffusion medium. During injection of the matrix resin, the bladder bag pressure was increased and adjusted so that the height H of the inner dimension of the cavity was 40 mm. Completion of the impregnation of the matrix resin into the glass fiber fabric laminate was judged by confirming that the matrix resin was discharged from the vacuum suction port. The time required for impregnation with the matrix resin was about half that of Example 1.
  • the injection of the matrix resin is stopped, the resin injection port is connected to the vacuum suction port, and in addition to the original vacuum suction port, the glass fiber fabric is also fed from the resin injection port.
  • the matrix resin excessively injected into the laminate was sucked.
  • the pressure of the bladder bag was adjusted so that the height H ′ of the inner dimension of the cavity was 32 mm.
  • the excess resin impregnated into the carbon fiber fabric laminate is sucked and removed from the resin injection port and vacuum suction port, the spacer collapses, and the upper mold finally has a high internal dimension of the cavity.
  • the woven fabric was lowered until reaching a predetermined thickness of 32 mm.
  • the glass fiber reinforced plastic was removed. As a result of cutting the glass fiber reinforced plastic and observing the cross section, no defects such as resin non-impregnated portions and voids were found. Further, the volume content Vf of the reinforcing fiber was measured in accordance with ASTM D 3171-99. As a result, it was confirmed that a high Vf could be achieved. Further, the thickness of the glass fiber reinforced plastic was measured at a total of 30 points every 1 m in the longitudinal direction, and as a result, it was confirmed that it was within the range of 32.0 ⁇ 1.0 mm.
  • Comparative Example 1 This will be described with reference to FIG. 50 reinforced carbon fiber fabrics having a width of 350 mm and a length of 20 m were laminated on a metal lower mold 101 to form a reinforcing fiber substrate 102.
  • the peel ply and the resin diffusion medium 103 were arranged on the entire surface of the carbon fiber woven laminate.
  • the whole was covered with the bag film 104, and the end of the bag film 104 was sealed with the lower mold 101 using the sealing material 105.
  • the total amount of the sealing material 105 used was about 45 m.
  • the inside sealed with the bag film 104 was depressurized by vacuum suction through a resin trap 107 and a vacuum suction port 108 by a vacuum pump 106, and atmospheric pressure was applied to the carbon fiber fabric laminate through the bag film 104.
  • the thickness of the carbon fiber fabric laminate was about 30 mm.
  • the matrix resin 109 was injected from the resin injection port 110 using atmospheric pressure, and the carbon fiber woven fabric laminate was impregnated through the resin diffusion medium 103. The injection was continued until the matrix resin gelled, but no discharge of the matrix resin was confirmed from the vacuum suction port.
  • the injection of the matrix resin is stopped, hot water is allowed to flow through a heat medium flow path (not shown) provided in the lower mold, the matrix resin is heated to 80 ° C. to cure, and the carbon fiber reinforced plastic is Molded.
  • the carbon fiber reinforced plastic was demolded.
  • the carbon fiber reinforced plastic was cut and the cross section was observed.
  • about 21 m 2 of bag film that cannot be reused after molding and about 45 m of sealing material were generated.
  • the method and apparatus for producing fiber reinforced plastic according to the present invention can be applied to the production of virtually any fiber reinforced plastic molded product, particularly for large structures that require high quality such as aircraft and windmill parts. Suitable for manufacturing.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Composite Materials (AREA)
  • Mechanical Engineering (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention porte sur un procédé et sur un appareil pour produire une matière plastique renforcée par des fibres par disposition d'une base de fibres de renfort dans la cavité formée par un moule supérieur et un moule inférieur, fermeture de la cavité, puis injection et infiltration d'une résine de matrice dans la base de fibres de renfort, et durcissement de la résine, lequel procédé et lequel appareil sont caractérisés en ce que la résine est injectée et infiltrée dans la base de fibres de renfort tout en maintenant la hauteur de la cavité supérieure à l'épaisseur d'un article moulé donné. Le procédé et l'appareil sont de plus caractérisés en ce qu'après l'infiltration, la résine qui a été injectée et infiltrée en excès dans la base de fibres de renfort est aspirée et retirée, et que, simultanément à cela, au moins l'un des moules supérieur et inférieur est pressé contre l'autre de façon à réguler ainsi la hauteur de la cavité, de telle sorte que l'épaisseur de la base de fibres de renfort devient égale à l'épaisseur de l'article moulé donné, et que la résine durcit tout en maintenant l'état de la cavité. Par conséquent, un article moulé de grande taille et à parois épaisses qui a une valeur Vf élevée et qui peut présenter de façon suffisante des caractéristiques de haute résistance et de haute élasticité pouvant être attribuées aux fibres de renfort peut être produit à un faible coût.
PCT/JP2010/067203 2009-10-09 2010-10-01 Procédé et appareil pour produire une matière plastique renforcée par des fibres WO2011043253A1 (fr)

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Cited By (13)

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JP2012245782A (ja) * 2011-05-30 2012-12-13 Boeing Co:The ファイバプリフォームの樹脂注入を用いて構造体を再加工するための方法と装置
JP2013203005A (ja) * 2012-03-29 2013-10-07 Toray Ind Inc Frp製造装置およびfrp製造方法
JP2014188999A (ja) * 2013-03-28 2014-10-06 Mitsubishi Aircraft Corp 繊維強化プラスチック部材の成形装置および成形方法
JP2014223805A (ja) * 2013-05-16 2014-12-04 ザ・ボーイング・カンパニーTheBoeing Company 複合構造及び方法
WO2014192601A1 (fr) 2013-05-31 2014-12-04 東レ株式会社 Procédé et dispositif pour la fabrication d'un plastique renforcé par des fibres
JP2014534918A (ja) * 2011-11-08 2014-12-25 スネクマ 樹脂注入によって複合材部品を製造するための圧力保持装置および関連する方法
DE102015217408A1 (de) 2014-09-18 2016-03-24 Honda Motor Co., Ltd. Verfahren und Vorrichtung zum Herstellen eines gegossenen Gegenstands aus faserverstärktem Kunststoff
KR101741792B1 (ko) 2017-01-19 2017-05-30 주식회사 에스컴텍 인퓨전 테이블장치
KR101980324B1 (ko) * 2017-11-13 2019-05-20 공주대학교 산학협력단 섬유 강화 플라스틱 및 그 제조 방법
WO2021019604A1 (fr) * 2019-07-26 2021-02-04 三菱重工業株式会社 Dispositif de formage de matériau composite et procédé de formage de matériau composite
CN115214068A (zh) * 2021-04-25 2022-10-21 广州汽车集团股份有限公司 一种成型孔的加工模具及加工方法
CN115384088A (zh) * 2021-05-24 2022-11-25 真准电子(昆山)有限公司 一种笔记本外壳碳纤维板模内植入射出成型设备
CN117532912A (zh) * 2023-11-27 2024-02-09 江苏赛欧环保设备有限公司 一种风筒加工的真空灌注工艺

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Publication number Priority date Publication date Assignee Title
JP2012245782A (ja) * 2011-05-30 2012-12-13 Boeing Co:The ファイバプリフォームの樹脂注入を用いて構造体を再加工するための方法と装置
JP2014534918A (ja) * 2011-11-08 2014-12-25 スネクマ 樹脂注入によって複合材部品を製造するための圧力保持装置および関連する方法
JP2013203005A (ja) * 2012-03-29 2013-10-07 Toray Ind Inc Frp製造装置およびfrp製造方法
JP2014188999A (ja) * 2013-03-28 2014-10-06 Mitsubishi Aircraft Corp 繊維強化プラスチック部材の成形装置および成形方法
JP2014223805A (ja) * 2013-05-16 2014-12-04 ザ・ボーイング・カンパニーTheBoeing Company 複合構造及び方法
WO2014192601A1 (fr) 2013-05-31 2014-12-04 東レ株式会社 Procédé et dispositif pour la fabrication d'un plastique renforcé par des fibres
DE102015217408A1 (de) 2014-09-18 2016-03-24 Honda Motor Co., Ltd. Verfahren und Vorrichtung zum Herstellen eines gegossenen Gegenstands aus faserverstärktem Kunststoff
KR101741792B1 (ko) 2017-01-19 2017-05-30 주식회사 에스컴텍 인퓨전 테이블장치
KR101980324B1 (ko) * 2017-11-13 2019-05-20 공주대학교 산학협력단 섬유 강화 플라스틱 및 그 제조 방법
WO2021019604A1 (fr) * 2019-07-26 2021-02-04 三菱重工業株式会社 Dispositif de formage de matériau composite et procédé de formage de matériau composite
CN115214068A (zh) * 2021-04-25 2022-10-21 广州汽车集团股份有限公司 一种成型孔的加工模具及加工方法
CN115214068B (zh) * 2021-04-25 2024-01-23 广州汽车集团股份有限公司 一种成型孔的加工模具及加工方法
CN115384088A (zh) * 2021-05-24 2022-11-25 真准电子(昆山)有限公司 一种笔记本外壳碳纤维板模内植入射出成型设备
CN117532912A (zh) * 2023-11-27 2024-02-09 江苏赛欧环保设备有限公司 一种风筒加工的真空灌注工艺
CN117532912B (zh) * 2023-11-27 2024-04-26 江苏赛欧环保设备有限公司 一种风筒加工的真空灌注工艺

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