WO2000018566A1 - Structure creuse en resine renforcee par des fibres et son procede de fabrication - Google Patents
Structure creuse en resine renforcee par des fibres et son procede de fabrication Download PDFInfo
- Publication number
- WO2000018566A1 WO2000018566A1 PCT/JP1999/005395 JP9905395W WO0018566A1 WO 2000018566 A1 WO2000018566 A1 WO 2000018566A1 JP 9905395 W JP9905395 W JP 9905395W WO 0018566 A1 WO0018566 A1 WO 0018566A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fiber
- core
- reinforced resin
- hollow
- hollow cross
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
- B29C70/546—Measures for feeding or distributing the matrix material in the reinforcing structure
- B29C70/548—Measures for feeding or distributing the matrix material in the reinforcing structure using distribution constructions, e.g. channels incorporated in or associated with the mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/06—Fibrous reinforcements only
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
- B29C70/44—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding
- B29C70/443—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding and impregnating by vacuum or injection
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
- B29C70/46—Shaping 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
- B29C70/48—Shaping 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
- B29C70/86—Incorporated in coherent impregnated reinforcing layers, e.g. by winding
- B29C70/865—Incorporated in coherent impregnated reinforcing layers, e.g. by winding completely encapsulated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
- B29L2031/3076—Aircrafts
- B29L2031/3082—Fuselages
Definitions
- the hollow FRP structure manufactured by the filament winding method is limited to a rotating body shape whose inner and outer shapes in a cross section perpendicular to the rotating axis are both substantially circular. That is, as the FRP structure having an opening having a hollow cross section smaller than the inner width (diameter), only a rotating body-shaped FRP structure was known. If the ratio of the inner maximum width to the maximum width of the opening is 1.1 times or more, the core cannot be pulled out of the opening, and thus, for example, US Pat. No. 3,220,910. The core is cut and taken out using a cutlet as disclosed in US Pat. In this case, if the structure includes a rib, there is a limit to such a cutting method.
- FRP structural material with a non-hollow cross-section and a plurality of hollow FRP structural materials with relatively large openings are joined and integrated, a hollow structure with a slightly more complicated shape can be manufactured.
- FRP features such as light weight, high strength, and high rigidity are likely to be impaired, for example, the strength and rigidity of the FRP at low points are reduced, and weight is increased due to the jig for joining. Furthermore, there is a problem that the man-hours required for joining causes an increase in cost.
- One feature of the FRP structure having a hollow cross section of the present invention is that it has a hollow shape having an inner maximum width larger than the maximum width of the opening.
- the joined part here is a joint for forming a structure, and is simply referred to as an accessory.
- the cross section of the body in the circumferential direction is a closed space.
- a hollow section is formed.
- the closed space portion formed in an integrated structure having no substantially joined portion is located at the end or the center of the main body.
- This portion has no bonded portion and is formed as a substantially integral structure, and most of the circumferentially oriented reinforcing fibers inside the FRP molded body (preferably 80% by volume, more preferably (Preferably 90% by volume) is not cut over one or more rounds, is formed with high strength and high rigidity, and keeps the strength and rigidity of the whole FRP molded body high. Therefore, a high-strength and high-rigidity as a whole is maintained even for a hollow FRP structure constituted by using a plurality of molded bodies.
- the main body is formed of a shell composed of the skin layer located on the outside and a core material located on the inside.
- the inside of the core material is preferably formed of a shell on which a skin layer made of a fiber reinforced resin is laminated.
- the core material further has a rib extending in the radial direction of the structure, is made of a foam, and has a groove formed on the surface thereof.
- the reinforcing fibers used in the fiber-reinforced resin that composes the main body include inorganic fibers such as carbon fiber, glass fiber, SiC fiber, alumina fiber, boron fiber, and metal fiber, and aramide fiber and high-density polyethylene fiber.
- carbon fibers are preferred because of their light weight, high strength and high rigidity. preferable. Among them, carbon fibers having a tensile modulus of 200 GPa or more and carbon fibers having a tensile strength of 4 GPa or more are preferable. In a transportation device having a possibility of collision, it is preferable to use carbon fiber having an elongation of 1.5% or more, more preferably 2.0% or more, which is excellent in impact resistance.
- the elastic modulus and strength of the carbon fiber can be measured according to JIS-R7601, and the elongation can be obtained by dividing the strength by the elastic modulus.
- the fact that the strand fluff obtained by the measurement method disclosed in Japanese Patent Publication No. 1-272867 is less than 30 pieces / m can provide a highly reliable structure. Is preferred. If the amount of fluff is more than this, yarn breakage may occur during molding or the like described later.
- the hollow FRP structure When the hollow FRP structure is a container, dunk, or storage, it stores solids such as grains, liquids such as gasoline, and gases such as various gases, so that carbon fiber with low water absorption and / or Glass fibers with high gas corrosion are preferred.
- the volume content of the reinforcing fibers is preferably in the range of 35% to 70%. If the volume content is lower than this range, the properties such as the strength of the structure tend to decrease.On the other hand, if the volume content is too high, difficulties such as resin impregnation may occur, which may cause problems such as an increase in cost. is there.
- the above-mentioned carbon fiber preferably accounts for 5 to 100% by volume of the reinforcing fiber in volume content.
- the volume content can be measured by the method specified in JIS-K7502 or JIS-K7705.
- the core can be molded whether it is hollow or solid, but a hollow core is not only lighter, but also expands the core by vacuum suction or internal pressurization, and reinforced fibers. It is more preferable because the strength can be improved by straightening the fiber or increasing the fiber content of the FRP. If the core is lightweight, it will be easy to handle, such as being moved during molding, and will save labor and safety. Even when the core is left in the FRP structure, a large internal space can be secured. Furthermore, since the amount of core material used is small, it is also economically preferable.
- the outer mold may be in direct contact with the outer mold or indirectly via a buffer layer such as a bag film, rubber, or an air cushion.
- the most preferred pressure is in the range of 0.5 kg Zcm 2 to 20 kg Zcm 2 .
- the application of external pressure improves the solubility of the gas that dissolves into the resin, resulting in reduced voids in the FRP molded product and improved mechanical properties of the structure. If the outer mold is made of a highly rigid material such as metal, the clamping force can be increased.
- the suction port for reducing pressure and the resin injection port may be provided on either the outer mold or the core.
- the workability is excellent.
- the core it does not leave traces on the outer surface of the molding material.
- the configuration of the mold and jig it may be possible to provide it on a part other than the outer mold and core.
- the material of the outer mold when heat resistance and high precision are required, a metal material or a ceramic material is preferable, and when light weight and economy are required, FRP or wood material is preferable.
- the same control can be performed by heat. That is, by heating the core and thermally expanding it, the same effect as pressurization can be obtained.
- the internal pressure may be applied directly to the core, but it is possible to combine a block and / or plate made of wood, metal, etc.
- a balloon-shaped thing can be inserted inside the core and inflated.
- the FRP structure may not be formed into the desired shape and dimensions, or the properties of the FRP structure may not be fully exhibited due to insufficient discharge of bubbles or diffusion of the resin.
- the shape of the magnetic material or the magnet is arbitrary, but if the shape is a band, the substrate can be fixed without loosening over a relatively wide range, and if the shape is a spot, the substrate can be partially firmly fixed. If it is a frame, it can be fixed in a frame.
- wood is preferred because it is easy to process and can withstand repeated use, and is lightweight and heat resistant.
- the above-described groove processing can be easily performed in the case of a wooden material.
- the most preferred plastic material is a thermoplastic resin suitable for injection molding, blow molding, rotational molding, and vacuum molding.
- a small groove can be formed on the outer surface of the core at low cost in a shape almost equivalent to the target FRP structure.
- blow molding has high productivity and can mold cores at low cost.
- preferred resins include high-density polyethylene, medium-density polyethylene, low-density polyethylene, cross-linked polyethylene, PVC, polyethylene terephthalate, polyamide, polycarbonate, acrylic resin, polybutylene, fluorine resin, polyester, and polyacetal. , Epoxy resin and the like.
- the powder size is within the range of 20 to 100 mesh, the core thickness is uniform and the internal structure is uniform, and the deformation during heating and pressing is uniform, It is preferable because the accuracy of the body is improved.
- fine powder particles of 10 mesh or less are mixed, they have the effect of lubricating the movement of particles, smoothing the flow of powder, and facilitating heat transfer. This is preferable because the child is easily obtained.
- those having a melt index of 2 to 4 are particularly preferable for rotational molding.
- an appropriate cooling rate is required because the cooling rate directly affects dimensional accuracy such as core shrinkage and deformation strain, and structural non-uniformity such as crystallinity and crystal size distribution. Slow cooling increases the density due to crystal growth and increases mold shrinkage. In the cooling step, molding distortion can be reduced by applying gas pressure inside the mold. Alternatively, it is preferable to replace the inside with an inert gas because oxidation can be almost completely prevented.
- lightweight foam materials include urethane foam, polystyrene foam, polyethylene foam, polypropylene foam, phenol foam, urea foam, polyvinyl chloride foam, silicone foam, epoxy foam, polyimide foam, polyester foam, melamine foam, etc.
- Lightweight foam material It has an apparent specific gravity of about 0.02 to 0.9. By injecting foam material into a female mold, the core can be molded in a high cycle. In addition, the above specific gravity does not cause deformation during molding.
- removal can be easily removed by mechanically scraping or shaving, or by blowing with wind or water pressure. In the case of water pressure, a pressure in the range of about 7 to 20 kgcm 2 is preferable because the possibility of damaging the FRP is reduced.
- the core foam material should be selected in advance so that the desired heat insulation, sound insulation, vibration characteristics, and impact characteristics can be achieved, assuming that they remain.
- a filler such as calcium carbide or silica particles or a reinforcing material such as fiber may be added to the core.
- the glass core is difficult to mold, but is transparent because it is transparent so that the FRP molding state can be checked in the same manner as the plastic core described above.
- the core of the wax ( ⁇ ) can be removed by heating, like the low melting point alloy. Natural wood is environmentally friendly. Also, the shape can be easily deformed and modified.
- the hollow FRP structure according to the present invention is a hollow FRP structure having an inner maximum width (0.5 m or more) larger than the maximum width of the opening, and has a non-rotating body shape. Or at least three openings. Specifically, for example, it can be applied to the following hollow structures.
- Figures 1 to 6 show specific examples.
- the circumferential groove 61 and the groove 61 communicate with the surface at an intersection with the groove, and the cross-sectional area of the groove is wider than the groove 62 at the top in the longitudinal direction.
- a groove 63 at the bottom, a concave groove 64 having a cross-sectional shape as shown in FIG. 8 on the surface, and a convex 65 raised from the periphery are formed, and an opening 66 is formed at one end.
- a hollow core 60 having such a shape was formed (A), and as shown in FIG. 8 (A), a reinforcing fiber substrate 82 was fixed to the outer periphery of the core 83 with a substrate holding material to form a preform.
- the outer mold shown in Fig. 7 is a split mold made of metal or FRP, and in some cases, made of wood with its molding surface sealed with resin or the like. May be further divided according to.
- the resin diffusion medium of, for example, a mesh material may be arranged on the surface of the core or the inner surface of the outer mold without forming the groove 61 provided for the resin passage in the circumferential direction of the surface of the core. .
- FIG. 11 shows an FRP molded body 114 having an opening 111 connected to the opening 111 on the top side, with one end being a closed part 111 and the other being an opening 112 on both ends.
- a hollow core 1311 having 135 is formed (A), a reinforcing fiber base material 1336 is arranged on the surface of the core 111 (B), and the whole is covered with a bag 1337.
- the resin 13 9 is injected via the injection path 140 by evacuation through the vacuum suction path 13 38 (C), and the injected resin is inserted into the groove 13 2 of the core 13 1.
- the resin is used to diffuse into the surface of the base material 136, impregnate the base material 136, and cure the resin to form a hollow FRP molded body having a predetermined shape.
- the resin core on which the reinforcing fiber base material was placed as described above was inserted and set in a two-part outer mold as shown in FIG. 7, and the mold was closed.
- the molds and between the mold and the core are sealed with an O-ring (not shown) and an auxiliary paste-like sealant.
- a “Teflon” tube is passed through the perforated holes provided at the top and bottom of the outer die split mating surface, and communicated with the longitudinal grooves provided at the top and bottom of the core.
- the inside of the tube communicating with the top is vacuum-evacuated to reduce the pressure in the gap between the inner surface of the outer mold and the outer surface of the core.
- the molded hollow FRP structure is taken out of the outer mold, and the inside of the core is depressurized to shrink the core, the core is removed, and a hollow integrated structure formed only from FRP is formed. did.
- the volume content of reinforcing fibers in the hollow FRP structure was 57% to 62%.
- the manufactured FRP hollow integrated structure had the specified strength, rigidity, and lightness with the rib shape as designed. Furthermore, the outer surface was smooth, and secondary processing such as polishing was not required except for a very small portion. In addition, the amount of voids determined by cross-sectional observation was 0.5%.
- MC450 two layers (bottom) for the core of the car floor Sandwich a polystyrene foam core (foam expansion ratio is 10 times, thickness is 6 mm, and small grooves with width lmm and depth 2.5 mm for resin flow are formed on each surface except upper surface). Thing And the entire outer surface is plain woven glass fiber base material (Nitto Boseki Mouth Bing Cloth WR 570 and Chioped Strand Mat MC 380). (One layer for each layer).
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Moulding By Coating Moulds (AREA)
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU60005/99A AU6000599A (en) | 1998-09-30 | 1999-09-30 | Hollow structure of fiber-reinforced resin and method of manufacturing the same |
EP99969691A EP1134069A4 (en) | 1998-09-30 | 1999-09-30 | FIBER-REINFORCED RESIN HOLLOW STRUCTURE AND METHOD FOR MANUFACTURING SAME |
CA002347717A CA2347717A1 (en) | 1998-09-30 | 1999-09-30 | A fibre-reinforced resin structure having hollow cross section and manufacturing method thereof |
KR1020017004013A KR20010075455A (ko) | 1998-09-30 | 1999-09-30 | 중공 단면을 갖는 섬유 강화 수지 구조체 및 그의 제조 방법 |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
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JP10/277641 | 1998-09-30 | ||
JP27764198 | 1998-09-30 | ||
JP27840898 | 1998-09-30 | ||
JP10/278408 | 1998-09-30 | ||
JP11/62872 | 1999-03-10 | ||
JP6287299 | 1999-03-10 |
Publications (1)
Publication Number | Publication Date |
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WO2000018566A1 true WO2000018566A1 (fr) | 2000-04-06 |
Family
ID=27297980
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1999/005395 WO2000018566A1 (fr) | 1998-09-30 | 1999-09-30 | Structure creuse en resine renforcee par des fibres et son procede de fabrication |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1134069A4 (ja) |
KR (1) | KR20010075455A (ja) |
AU (1) | AU6000599A (ja) |
CA (1) | CA2347717A1 (ja) |
WO (1) | WO2000018566A1 (ja) |
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- 1999-09-30 AU AU60005/99A patent/AU6000599A/en not_active Abandoned
- 1999-09-30 WO PCT/JP1999/005395 patent/WO2000018566A1/ja not_active Application Discontinuation
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Also Published As
Publication number | Publication date |
---|---|
EP1134069A4 (en) | 2006-01-04 |
KR20010075455A (ko) | 2001-08-09 |
EP1134069A1 (en) | 2001-09-19 |
CA2347717A1 (en) | 2000-04-06 |
AU6000599A (en) | 2000-04-17 |
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