WO1990009272A1 - Production d'articles creux en resine thermoplastique renforcee par des fibres - Google Patents

Production d'articles creux en resine thermoplastique renforcee par des fibres Download PDF

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Publication number
WO1990009272A1
WO1990009272A1 PCT/JP1990/000192 JP9000192W WO9009272A1 WO 1990009272 A1 WO1990009272 A1 WO 1990009272A1 JP 9000192 W JP9000192 W JP 9000192W WO 9009272 A1 WO9009272 A1 WO 9009272A1
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WO
WIPO (PCT)
Prior art keywords
core
thermoplastic resin
mandrel
hollow
fiber
Prior art date
Application number
PCT/JP1990/000192
Other languages
English (en)
Japanese (ja)
Inventor
Hajime Satoh
Original Assignee
The Yokohama Rubber Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by The Yokohama Rubber Co., Ltd. filed Critical The Yokohama Rubber Co., Ltd.
Priority to JP2503370A priority Critical patent/JPH074878B2/ja
Publication of WO1990009272A1 publication Critical patent/WO1990009272A1/fr

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Classifications

    • 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
    • B29C61/00—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
    • B29C61/006—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor the force created by the liberation of the internal stresses being used for compression moulding or for pressing preformed material
    • 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
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/80—Component parts, details or accessories; Auxiliary operations
    • B29C53/82—Cores or mandrels
    • B29C53/821—Mandrels especially adapted for winding and joining
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D23/00—Producing tubular articles

Definitions

  • the present invention relates to a method for producing a hollow fiber-reinforced thermoplastic resin body (for example, a round pipe, an elliptical pipe, a square pipe, etc.) using a prepreg using a thermoplastic resin as a matrix.
  • a hollow fiber-reinforced thermoplastic resin body for example, a round pipe, an elliptical pipe, a square pipe, etc.
  • Composite materials made of thermoplastic resin reinforced with continuous fibers have high specific strength, high specific stiffness, and high toughness, and are mainly used in the space and aviation fields.
  • the hollow fiber-reinforced thermoplastic resin body can be used for single-shell structures such as the body of a flying object, torque tubes, pressure vessels, pipe piping, and truss structures.
  • a winder in which a band-shaped prepreg impregnated in a resin matrix with the continuous fibers is wound around a mandrel made of metal or the like.
  • a switching method When a hollow body is manufactured by this winding method, a pre-prepared material whose matrix is a thermosetting resin is tacky, self-adhesive, and plastic at room temperature. As a result, the mandrel can be wound tightly while avoiding the formation of voids, and there was no major obstacle to productivity.
  • thermoplastic pre-predator a pre-predder that uses a thermoplastic resin as a matrix
  • a thermoplastic pre-predator has not only low tackiness and plasticity at room temperature but also a thin sheet form.
  • the rigidity is high because there is no change to a hard plate reinforced with steel.
  • the thermoplastic resin pre-bleder cannot be temporarily fixed on the mandrel simply by being wound around the mandrel. Therefore, before winding the thermoplastic resin prepreg around the mandrel, it is necessary to locally heat the thermoplastic resin prepreg with an oral heating device.
  • the portion where the thermoplastic resin prepreg is wound around the mandrel is set as the hot spot area, and the hot spot area is wound while being heated by the local heat device.
  • the thermoplastic resin pre-leg is plasticized in the hot spot area to impart tackiness to that area, and the thermoplastic resin pre-leg is applied to the mandrel while removing the void from between the winding plies. It was necessary to wrap it. Therefore, since the hot spot area had to be moved in conjunction with the movement of the wrapping place, the mouth-to-mouth apparatus had to be a complicated and expensive apparatus.
  • thermoplastic resin of the thermoplastic resin pre-predader in order to raise the temperature of the thermoplastic resin of the thermoplastic resin pre-predader to its plasticizing temperature, the hot spot area is heated by taking a considerable amount of time for the heat to stay in the hot spot area.
  • the time required for winding the thermoplastic resin prepreg on the barrel became very long, which forced the productivity of the air body to decrease.
  • productivity when manufacturing a hollow body using a thermoplastic resin pre-prepared material, it is difficult to make a tight contact between the laminated ply, so that a void is easily formed between the laminated ply.
  • productivity when using existing equipment, there was an essential disadvantage that productivity was poor.
  • thermoplastic resin prepreg is wound around a mandrel while being sufficiently pulled, it is difficult to orientate the reinforcing fibers of the thermoplastic resin prepreg without loosening. There was a problem that the strength of the thermoplastic resin pre-bleda was not sufficiently reflected on the body, and the appearance was likely to be poor.
  • the present invention has been made to solve the above-mentioned drawbacks when manufacturing a hollow body using a thermoplastic resin prebleder. Accordingly, it is an object of the present invention to produce a hollow body of high quality with high degree of freedom and a high quality in which a fiber arrangement and a laminated structure of a thermoplastic resin pre-preda are realized in a hollow body as designed. An object of the present invention is to provide a method for producing a hollow fiber-reinforced thermoplastic resin body. The present invention is particularly suitable when using a pre-predder using a high melting point mature plastic resin as a matrix. Disclosure of the invention
  • a method for producing a fiber-reinforced thermoplastic resin ⁇ air space comprises the steps of: preparing a pre-prepared material using a thermoplastic resin as a matrix; a thermally expandable core; Between the outer mold and the outer mold, and then the thermoplastic resin. After the pre-preda and the core are heated to a temperature equal to or higher than the plasticization temperature to expand the core, the core and the pre-preda are cooled.
  • FIG. 1 (A) is an explanatory diagram showing a solid mandrel used in the present invention
  • FIG. 1 (B) is an explanatory view showing an example of a thermoplastic resin pre-preda used in the present invention
  • Fig. 2 is an illustration showing the winding of a thermoplastic resin pre-predder around a solid mandrel
  • Fig. 3 is an explanatory view showing a roll obtained after winding
  • Fig. 4 is a perspective explanatory view showing a state in which a solid mandrel is restrained by a vacuum bag together with the roll;
  • Fig. 5 is an explanatory cross-sectional view of the apparatus in the heat forming process
  • Fig. 6 is a perspective view of a solid mandrel wrapped with a thermoplastic resin pre-predesheet and a metal pipe placed over it;
  • Fig. 7 is a perspective view of the state shown in Fig. 6 when it is heated above the plasticizing temperature of the thermoplastic resin of the matrix and then lowered to below that temperature;
  • FIG. 8 shows the replacement of the solid mandrel of Fig. 7 with a thicker one, and again heating the solid mandrel above the plasticizing temperature of the matrix thermoplastics, and then below Perspective view of the state when the temperature is lowered to;
  • FIG. 9 is a perspective explanatory view showing an example of a method for manufacturing a hollow body using a hollow mandrel;
  • 10 to 12 are perspective explanatory views showing a hollow mandrel used in the present invention.
  • Fig. 13 and Fig. 14 are explanatory diagrams each showing an example of a heating means for a hollow mandrel
  • FIG. 15 is a perspective explanatory view showing a state in which a thermoplastic resin prepreg is wound around the inner surface of the cavity in the outer mold to form a hollow roll;
  • FIG. 16 is a perspective explanatory view showing a state in which a core including a core and a heat-expandable element is inserted into a hollow portion of a hollow roll;
  • FIG. 17 is a perspective explanatory view showing a state in which the thermally expandable element thermally expands when the hollow roll is heated;
  • FIG. 18 is a perspective view showing an example of a product obtained by the present invention.
  • FIGS. 19 (A) and (B) are perspective views each showing an example of a core used in the present invention.
  • FIG. 20 is a perspective view showing an example of a product obtained by the present invention.
  • FIG. 21 is a side view explanatory view showing an example of a core constituting the core
  • FIG. 22 is a side view explanatory view showing an example of a thermal expansion element constituting the core
  • Fig. 23 is a side view explanatory view showing an example of the outer mold
  • FIG. 24 is a perspective view showing an example of a product obtained by the present invention
  • Fig. 25 (A) is a side view explanatory diagram showing an example of a core body constituting a core;
  • Fig. 25 (B) is an explanatory view of the front view
  • Fig. 26 (A) is a side view explanatory view showing an example of the thermal expansion element constituting the core
  • Fig. 26 (B) is an explanatory view of the front view
  • FIG. 27 (A) is a side view showing an example of a product obtained by the present invention.
  • Figure 27 (B) is the front view
  • FIG. 28 (A) is a side view explanatory view showing an example of a core constituting a core
  • FIG. 28 (B) is a front view explanatory view thereof
  • Fig. 29 (A) is a side view explanatory view showing an example of the thermal expansion element constituting the core
  • Fig. 29 (B) is an explanatory view of the front view
  • FIG. 30 (A) is a perspective view showing an example of a product obtained by the present invention.
  • Figure 30 (B) is the front view
  • FIG. 31 is a side view explanatory view showing an example of a core constituting a core
  • FIG. 32 (A) is a side view explanatory view showing an example of a thermal expansion element constituting a core
  • FIG. 32 (B) is a front view explanatory view thereof
  • Fig. 33 is a side view explanatory view showing an example of a core
  • FIG. 34 is a perspective view showing an example of a product obtained by the present invention
  • FIG. 35 is a side view explanatory view showing an example of a core constituting the core
  • FIG. 36 is a side view explanatory view showing an example of a thermal expansion element constituting the core
  • FIG. 37 is a perspective view showing an example of a product obtained by the present invention.
  • FIG. 38 is a side view explanatory view showing an example of a core constituting a core
  • FIG. 39 ( ⁇ ) is a plan view explanatory view showing an example of a thermal expansion element constituting a core
  • Fig. 39 ( ⁇ ) is a plan view explanatory view showing a state in which the thermal expansion elements are combined;
  • FIG. 40 is an explanatory sectional view showing a main part of an example of a core
  • Fig. 41 is a sectional explanatory view showing a state in which a metal member is charged into a molding material
  • FIG. 43 Perspective view showing an example of a product ⁇ ⁇ "lambda FIG. 43 obtained One by the present invention (an elongated tapered pipe);
  • FIG. 42 is a sectional explanatory view showing an example of a product having a portion of the metal member;
  • Fig. 44 is an explanatory side view showing an example of the outer mold
  • Fig. 45 is an explanatory side view showing an example of a core
  • Fig. 46 is a perspective view showing the preform and the core;
  • Fig. 47 is the temperature profile during the heating process of the molding material. Explanatory diagram showing three files;
  • FIG. 48 is an explanatory diagram showing a temperature profile when the molding material is pushed down from one end to the other end in the molding process;
  • Fig. 49 is an illustration showing the cooling pattern during the cooling process of the product at the processing temperature;
  • FIGS. 50 (A), (B), and (C) are illustrations showing the state of mold clamping in the cooling process.
  • BEST MODE FOR CARRYING OUT THE INVENTION The thermoplastic resin pre-preda used in the present invention is, specifically, formed into a fiber bundle generally called “to” in which a plurality of continuous fibers are aligned and arranged in a band in one direction.
  • the reinforcing fibers used in the fiber bundle constituting the thermoplastic resin pre-preda are not particularly limited, but are preferably carbon fibers, glass fibers, aramide fibers (aromatic polyamide fibers), silicon carbide fibers, Examples thereof include continuous fibers having high heat resistance and high strength such as boron fibers and alumina fibers.
  • the thermoplastic resin of the matrix is not particularly limited, but is preferably a polyether ether ketone (PEEK) having a melting point of 343, and a polyolefin ether having a melting point of 282 to 288'C.
  • PEEK polyether ether ketone
  • Polyolefin ether having a melting point of 282 to 288'C.
  • PEI polyetherimide
  • PES Polyether Sulfone
  • Poly-Lenketone Poly-L-Ren Sulfide with a softening point of 219 Lia Lui Mid, Polyamido, Polyimid, Polyimid Sulfo
  • thermoplastic resins having a high melting point or a high softening point such as polystyrene, polysulfone, polyarylsulfone, and polyester.
  • the heat-expandable core (inner mold) used in the present invention is made of a resin having higher heat resistance than the thermoplastic resin which is the matrix of the thermoplastic resin pre-spreader. . That is, the core must have heat resistance that does not melt and flow at a temperature at which the thermoplastic resin of the thermoplastic resin pre-plasticizer plasticizes. In addition, this core compresses the thermoplastic resin pre-pre- der laminated between the core and the outer die from the inside to the outside, so that the product of the thermoplastic pre-pre- der can be stacked. It is necessary that the material be thermally expandable so that voids are eliminated from the space between the laminated plies so that the reinforcing fibers of the thermoplastic resin pre-predator are oriented closely.
  • the core may be a solid mandrel, a hollow mandrel, a composite in which a plurality of thermal expansion elements are arranged on the surface of a core, or a plurality of heat expandable elements. It is in the form of an aggregate consisting of only expandable elements.
  • the core may be made of metal such as iron or aluminum alloy.
  • these solid mandrels, hollow mandrels, thermal expansion Preferred examples of the resin constituting each of the conductive elements include a fluorine-based resin ⁇ a silicone-based resin ⁇ .
  • fluorine resins include polytetrafluoroethylene (PTFE, trade name Teflon), polyfluoroalkoxyethylene resin (PFA), and fluoroethylenepropylene ether copolymer resin (FEP).
  • PTFE polytetrafluoroethylene
  • PFA polyfluoroalkoxyethylene resin
  • FEP fluoroethylenepropylene ether copolymer resin
  • a resin having a large thermal expansion property and a high heat resistance can be exemplified.
  • silicon-based resin since the resin alone is too soft, a silicone resin mixed with a reinforcing material having high heat resistance can be exemplified. In use, these resins may be reinforced with a reinforcing material such as inorganic fibers.
  • PTFE has a usable limit of about 260 and a higher melting point at about 335, but retains its own shape without melting even above 335 due to its very large molecular weight. Also, the volume expansion is large, and when the temperature is increased from room temperature to 400'c, the volume expands by about 60%. Thermal decomposition temperature is about 420'c.
  • an outer mold is arranged outside the above-mentioned heat-expandable core, and a thermoplastic resin pre-reader is interposed between the core and the outer mold. At this temperature, the thermoplastic resin pre-bledder and the core are heated to expand the core.
  • the heating in this case may be performed in air, inert gas, or vacuum.
  • the required heating atmosphere may be selected depending on the matrix resin. Heating is generally faster, It is preferable from the viewpoint of prevention of deterioration of the resin and economy of time.
  • the heating process of the heat-expandable element can be described as follows: whether all the heat-expandable elements of the core heat up at the same time, or heat the heat from one end to the other end. Or, the core rises in temperature from the center, and the end of the core is better: slightly slower.
  • the energy supply means for heating can be selected according to the specific product shape while taking the above into account. For example, use atmosphere heating, heating of inner and outer molds, heat-induced ripening, and an appropriate combination of these! > Things are possible.
  • the core and the thermoplastic resin prepreg are cooled together with the outer mold after heating and melting the thermosetting resin and clamping the mold.
  • This cooling has a profound effect on controlling the crystallinity and residual stress of the thermoplastic resin, which is the matrix, and maintaining the mold clamping pressure (at least the mold clamping pressure until the resin degrades). . : ...-For controlling crystallinity and residual stress, it is a matrix Some cases are very severe depending on the type of thermoplastic resin, while others are not so severe. Maintaining the clamping pressure is a problem that applies to all matrices. This problem is mainly solved by the design of the core structure. In other words, for example, in order to make a difference in the cooling rate between the molding material (thermoplastic resin pre-paeder) and the thermal expansion element of the core, the force that makes the core hard to cool down.
  • a cooling means may be appropriately selected. For quenching, it is better to spray the core, molding compound, and outer mold with water or soak the whole in water. In order to cool slowly, it is necessary to keep the temperature appropriate for the required cooling rate.
  • the core may be appropriately disassembled and removed from the molded product.
  • a core that can be disassembled and assembled in advance may be used.
  • release processing may be performed by covering the inner surface of the outer die with a release film, a release foil, a release agent, or the like.
  • a copper die is used as the outer die, for example, it is not necessary to provide any means for releasing.
  • the outer mold itself can be etched and chemically dissolved. Also, when copper pipes are used as the outer mold, it is convenient when the number of products to be produced is small, since it is not necessary to separately prepare the outer mold. In addition, copper pipes have particularly high wall surface accuracy, so that the surface accuracy of the outer surface of the resulting product can be increased.
  • the core consists of only a solid mandrel, a hollow mandrel, a composite in which a plurality of thermal expansion elements are arranged on the surface of a core, and a plurality of thermal expansion elements.
  • a method for manufacturing a thermoplastic resin hollow body using each of the aggregates will be specifically described.
  • thermoplastic resin pre-predator is wound around the solid mandrel.
  • This winding is performed by, for example, a normal winding method or a lorry. What is necessary is just to perform by the method.
  • a thermoplastic resin pre-reader with a width of 3 to 6 is used.
  • the width is 70 mn!
  • the device used in the filament winding method or the tape winding method may be a winding device or a rolling method in a mouth ring method. Device.
  • thermoplastic resin pre-preda is wound around the solid mandrel in a pipe shape while applying tension to the solid mandrel.
  • a soldering iron or the like at an appropriate point in the winding process. It is preferable to wind as tightly as possible while heating and temporarily fixing the brim.
  • thermoplastic resin pre-predder on the solid mandrel When the winding of the thermoplastic resin pre-predder on the solid mandrel is completed and the wound is formed, the wound is then subjected to a heating shaping process.
  • the outer shape of the wound product to be subjected to the heat forming step be restricted by the outer die.
  • This constraint on the outer shape is due to the fact that the winding is heated even if the outer shape of the wound is temporarily fixed because the ply of the wound is temporarily fixed as described above. Preventing the molding process from causing its shape to collapse or the direction of the fibers arranged in the roll to be disturbed or displaced when the solid mandrel expands It is in. More importantly, however, due to the outer shape constraint of the roll, the pressure caused by the thermal expansion of the solid mandrel is evenly distributed from inside to outside of the laminated briquette of the roll wound in a pipe shape for the first time. In addition, the laminated ply is brought into close contact with each other, voids are removed from between the laminated ply, and the thermoplastic resin pre-predder constituting the roll is supplemented. The ability to correctly orient the strong fibers.
  • Examples of the above-mentioned outer shape constraining method include a method of inserting a solid mandrel together with a middle wound material of a vacuum bag and applying atmospheric pressure or the like to the surface thereof, or a tape such as a heat-resistant film or a metal foil. There is a method of taping the surface of the wound material using a method such as using a tubing tension, a method of covering a thin metal pipe on the surface of the wound material, and a method of using a mold. These restraining methods are appropriately selected according to the specifications of the hollow body to be molded. Prior to restraining the outer shape, a release agent or release sheet may be added to the roll to prevent adhesion between the outer mold for restraining the ⁇ shape and the thermoplastic resin of the roll. It is also possible to intervene between the outer mold.
  • the molding temperature in the heat molding step is equal to or higher than the plasticization temperature of the thermoplastic resin of the thermoplastic resin pre-preda constituting the roll.
  • the thermoplastic resin is a crystalline thermoplastic resin
  • a temperature higher than its melting point preferably a temperature of [melt + 1020'c] or more
  • a temperature higher than its softening point preferably a temperature higher than [softening point + 100'c] is preferable.
  • the heating means at the time of heat molding is not particularly limited, but the simplest means is an electric oven.
  • the heating time is generally set according to the size of the roll so that a predetermined molding temperature is obtained at the center of the solid mandrel. Normally, when the wound material is considered to have risen to the prescribed molding temperature, it takes only a few thousand hours, e.g. Good to keep.
  • the solid mandrel is sufficiently expanded by heating, the close contact between the wound plies is completed. Finally, the solid mandrel is extracted from the roll after cooling the roll and the solid mandrel thus heated. This will recover the product and the solid mandrel.
  • the cooling may be natural cooling or active cooling using some cooling means.
  • FIG. 1 (A) and FIG. 1 (B) show the first step of the present invention.
  • 1 is a solid mandrel made of PTFE
  • 2 is a thermoplastic resin prepreg having reinforcing fibers 3 in which continuous fibers are arranged in an oblique direction. It is.
  • the thermoplastic resin pre-predator 2 is formed by stacking two sheets each having the reinforcing fibers 3 cut in the bias direction.
  • the thermoplastic resin pre-predator 2 has a fiber volume fraction Vf of 0.61 and a sheet width of 305 using PEEK as a matrix and carbon fiber filaments of about 7 / m in diameter as reinforcing fibers.
  • APC-2 / AS-4 manufactured by ICI-Fiberite with a thickness of 0.125 mm was used.
  • thermoplastic resin pre-pre- der 2 is wound around a mandrel 1 by a winding device as shown in FIG.
  • the thermoplastic resin pre-predator 2 applies tension to minimize tarnish. It is wound in a pipe shape, and is heated by a soldering iron at some points in the middle of winding and is temporarily fixed.
  • FIG. 3 shows a roll 11 obtained after the above winding operation.
  • the diameter of the mandrel 1 was 3 (T, the number of briquettes of the thermoplastic resin pre-predator 2 was 30, and the thickness of the ply layer was about 4.8 »».
  • the inter-layer distance was 1.2, corresponding to about 1/4 in total.
  • the mandrel 1 together with the wound material 11 is placed in a vacuum bag 6 to be sealed, and then vacuumed through an exhaust hose 7 connected to a vacuum pump.
  • the air in bag 6 is removed by suction.
  • a polyimide film (“Kapton (KAPT0N) 11 100H” manufactured by DuPont) was used as the vacuum bag 6.
  • the roll film 11 and the polyimide film of the vacuum bag 6 on the surface of the mandrel 1 do not wrinkle.
  • the atmospheric pressure of l kg / crf acts evenly from the outer periphery of the roll 11 to the laminated portion of the roll 11 and the outer shape is reliably restrained. You.
  • the rolled material 11 and the mandrel 1 whose outer shapes are restricted as described above are placed in an electric oven as shown in FIG.
  • the electric oven has heating blocks 8 and 9 arranged above and below, and is sealed with an insulating block 10 so that the inside can be heated to keep the inside at 400'c. 30 minutes after the start of heating, the roll 11 and the mandrel 1 are taken out of the electric oven and allowed to cool, and then the mandrel 1 is pulled from the roll 11. This was punched out to obtain a molded pipe.
  • the obtained pipe has an inner diameter of 36 «a, a wall thickness of 3.7 w, and a reinforcing fiber of ⁇ 45.
  • the layers were stacked without any disturbance at any angle, and as a result of microscopic observation, they were of high quality with no voids.
  • thermoplastic resin pre-preda The fiber orientation of the thermoplastic resin pre-preda is 0 ° and 90 °.
  • a pipe was produced under exactly the same conditions as in Example 1 except that the pipes were laminated such that
  • the resulting pipe has no reinforcing fibers. And 90. Except for the lamination at an angle of, as in Example 1, it was of high quality with no fiber disturbance or voids.
  • the obtained pipe had an inner diameter of 34 mm, a wall thickness of 3.9 mm, and a captive fiber of ⁇ 45.
  • the layers were stacked without any disturbance at any angle, and as a result of microscopic observation, they were of high quality with no voids.
  • the above-described method using a solid mandrel relies on the thermal expansion of the solid mandrel and mold clamping.
  • the thickness of the hollow body to be manufactured is relatively thick and one thermal expansion of a solid mandrel is insufficient, or the melting point or softening point of the thermoplastic resin of the matrix Is relatively low, the difference in temperature between the solid mandrel and the thermoplastic resin is not large enough, and thermal expansion on one side is not enough.
  • the present invention provides a method for manufacturing a hollow fiber-reinforced thermoplastic resin body using a solid mandrel, which overcomes the manufacturing limit of thickening and manufactures a hollow body having a small outer diameter and a small thickness ratio. It also provides a way to do this.
  • the four hollow bodies obtained by this method are used especially for pressure-resistant parts that require strength and power transmission parts that require bending and torsional rigidity.
  • this method is also applied to the production of continuous fiber-reinforced pipes using engineering ring plastics with a somewhat melting point as matrix.
  • a prepreg made of a thermoplastic resin as a matrix is wound around a solid mandrel made of a resin having a high thermal expansion property and a higher heat resistance than the thermoplastic resin. Heating the wound material and the solid mandrel to a temperature equal to or higher than the plasticizing temperature of the thermoplastic resin while restraining the outer shape of the obtained wound material with an outer mold; Inflate and
  • the inner diameter of the hollow body obtained by thermally expanding the solid mandrel from the inside is expanded by using a thin solid mandrel, and then the first mandrel is used.
  • a slightly thicker solid mandrel is inserted into the hollow body and thermally expanded again from the inside, expanding the inner diameter of the hollow body further than before, virtually eliminating voids in the hollow body layer
  • the heating is repeated until the diameter of the solid mandrel is increased.
  • a single thermal expansion of a solid mandrel can be achieved by expanding the solid mandrel to produce a thick hollow body that requires more expansion of the solid mandrel. Since the inner diameter of the hollow body cannot be expanded sufficiently, the remaining hollow body of the laminated void may not be replaced. However, at this stage, since the inner diameter of the hollow body is larger than the outer diameter of the solid mandrel used initially, the solid mandrel that is one turn thicker than this solid mandrel is hollow. Can be inserted into the body.
  • a solid mandrel is first expanded from the inside with a thin object to expand the inner diameter of the finished hollow body.
  • a solid mandrel slightly thicker than the one used first, is inserted into the hollow body and thermally expanded again from the inside.
  • the inserted solid mandrel is unheated, but the hollow body can be unheated or heated.
  • both the solid mandrel and the hollow body reach the temperature (above the plasticization temperature)
  • the inner diameter of the hollow body expands and the number of laminated voids decreases compared to the first stage.
  • the heating is repeated by sequentially increasing the diameter of the solid mandrel until the voids in the hollow body layer are substantially eliminated. It is often possible to eliminate laminated voids in one go, but if that is not feasible, use thicker solid mandrels sequentially. This will eventually eliminate the laminated void completely. This is due to the fact that the matrix resin is thermoplastic and can be plasticized and solidified reversibly many times by heating and cooling.
  • FIG. 6, FIG. 7, and FIG. 8 are diagrams showing the procedure of an example of this method.
  • 21 is a solid mandrel made of PTFE
  • 22 is a gap as far as it comes out of a pre-predasite (APC-2 / AS4) reinforced with carbon fiber using PEEK as matrix. It is a roll wound around mandrel 21 as if Is constrained by copper pipe 23.
  • the pre-prepared material to be the product pipe is placed in the space between the thermally expanding mandrel 21 and the copper pipe 23 for externally constraining the shape.
  • the diameter of the mandrel 21 is 20 «and the inner diameter of the copper pipe 23 is 32 ⁇ ».
  • the material in the state shown in Fig. 6 was heated to 400'c, and after the mandrel 21, the pre-predated sheet, and the copper vibrator 23 reached 400, both were cooled to room temperature. Get the state of. Since the diameter of the mandrel 21 was expanded to 23 M at 400 'c, the pre-predated sheet was evenly compressed between the copper pipe 23 and the mandrel 21 under the melting of PEEK. Form a pipe 25 of 2 3 TM.
  • Pipe 25 still has laminated voids due to insufficient compression.
  • a gap 27 is formed between the pipe 25 and the mandrel 21 by cooling the mandrel 21.
  • a thick mandrel 21a (diameter 22 w) can be easily inserted into the space 27.
  • the diameter of the mandrel is 20 «m and the inner diameter of the copper pipe is 3 2
  • the heating temperature was 330, and the state shown in Fig. 7 was obtained.
  • the mandrel expanded at 3330'c to a diameter of 22.6c, forming a pipe 25 with an inner diameter of 22.6.
  • a mandrel with a diameter of 23M was (1 3 % Thermal expansion) up to 25.99 m, but the radial expansion is limited by the material of the prepreg (after the void has been removed) and the excess expansion The tension causes axial expansion, so that no extra expansion is applied to the pre-preda to be molded.
  • Example 4 Example 5
  • a comparative example following this will be described.
  • the wall thickness when laminated so as not to include the laminated voids does not substantially flow out of the resin. If the amount of the pre-preducted material to be wound, that is, the length in the winding direction is given, it is naturally determined.
  • the diameter of the mandrel, when inflated, finally matches or exceeds the expected inner diameter a pipe without a laminated body as shown in Examples 4 and 5 is obtained. If not, it is a poor pipe with a stacked body.
  • This pipe has a wall thickness of 3.3 «to 4.5 « in the absence of laminated voids and has a reasonable appearance but a laminated void of about 25%. (A pipe with a large body is very poor in strength.)
  • thermoplastic resin pre-reader 32 is interposed between the outer die 33 and the inner peripheral surface. Hollow mandrels have better thermal conductivity than solid mandrels.
  • a molding material is interposed between the outer peripheral surface of the hollow cylindrical mandrel 31 and the inner peripheral surface of the hollow cylindrical outer die 33. This can be done in the same manner as when using a solid mandrel as described above. Then, heating and cooling are performed in the same manner as when a solid mandrel is used, so that a fiber-reinforced hollow thermoplastic resin body can be obtained.
  • a solid or hollow metal or ceramic core 34 may be fitted into the mandrel 31.
  • the mandrel 31 can be supported, even when the mandrel 31 is thin, the molding material can be pressed uniformly without deformation of the mandrel 31.
  • heat transfer is particularly rapid and uniform, which has a particularly remarkable effect in terms of production efficiency and quality.
  • the mandrel 31 may be reinforced by a fiber 35 parallel (0) to the axis. Thereby, the thermal expansion can be suppressed in the axial direction and the radial direction can be emphasized.
  • the mandrel 31 may be reinforced by a fiber 35 parallel (0) to the axis and a fiber 36 perpendicular to the axis (90). This allows the mandrel 31 to expand more uniformly in the radial direction.
  • an electric heater 37 is inserted into the core 34 as shown in FIG. 13 or a cylinder 41 having a heat medium supply pipe 42 built in as shown in FIG. It is good to charge inside. This allows for faster and more uniform processing temperatures than with ambient heating. As a result, the production time can be shortened and the quality can be improved. In particular, atmospheric heating is particularly effective for long pipes (large molded products), which take time to reach the ambient temperature as a whole.
  • reference numeral 40 denotes a power supply unit.
  • reference numeral 43 denotes a wall of the heating furnace
  • 44 denotes a heat medium inlet
  • 45 denotes a heat medium outlet.
  • a prepreg (APC-2 / AS4, manufactured by ICI-FIBE IHTE) wound around £ 1 ⁇ It was placed between the tube 31 and the outer mold 33, and the whole was put in a heating furnace at 400 ° for 30 minutes, and then poured into a water tank filled with cold water (about 20) to be quenched.
  • the carbon continuous fiber reinforced hollow body obtained by using PEEK as a matrix was an extremely uniform and good molded body without fiber turbulence and laminated voids everywhere. Comparative Example 2
  • a hollow body reinforced with continuous carbon fiber using PEEK as a matrix was manufactured in the same configuration as in Example 6, except that a solid PTFE mandrel was used. It was placed in a heating furnace and kept for 30 minutes, but the center of the mandrel was not sufficiently heated, and a stacking board remained in the center, which was a problem.
  • the mandrel shown in Fig. 10 almost the same as in Example 6.
  • a hollow body was manufactured in the same manner.
  • the mandrel used here is a metal pipe provided with a hollow body made of solid PTFE of the same dimensions as that of the sixth embodiment. In this case, heat transfer was uniformly and quickly achieved by the effect of the metal pipe, and a product excellent in quality similar to that of Example 6 could be obtained by heating for 20 minutes.
  • a product was made in the same configuration as in Example 6, except that the mandrel shown in FIG. 11 was used.
  • the outer diameter of the mandrel is the same except that the mandrel is reinforced with glass fiber in the axial direction and the thickness of the PTFE is 1 ⁇ 2 in Example 7.
  • the outer diameter of the metal pipe is larger due to the thinner part). In this case, the thermal expansion in the axial direction is limited by the glass fiber, and the thermal expansion in the radial direction is sufficiently achieved, even though the thickness of the PTFE is small.
  • the PTFE layer was thin, a good product could be obtained in a heating time of 10 minutes.
  • the mandrel was less deformed and could be reused as it was.
  • the heating time be as short as 10 minutes TeSumi, for re-use shape once: such as the recovery is not necessary, overall The effect of reducing the production cost is remarkable.
  • the rod-shaped electric heater (cartridge heater) shown in Fig. 13 is inserted into the metal pipe shown in Fig. Manufactured a product in the same manner as in the other examples. When the heater was heated in the heating furnace, uniform heating of the whole was completed in 3 minutes, and a good product could be obtained.
  • the heater shown in Fig. 13 is inserted into the mandrel shown in Fig. 10 to make a mandrel having heating means, and a pre-prepared tape (APC- 2 / AS 4) was wound so as to form a layer structure of ⁇ 45 °, and an outer mold was placed on top of it.
  • a pre-prepared tape APC- 2 / AS 4
  • This is put into a heating furnace at 400, and the heater is operated at the same time, and is uniformly and rapidly heated in the axial direction by the atmospheric heating and the heating of the heater, and the prepreg, the mandrel, and the outer mold are heated in about 3 minutes. 00 ⁇ .
  • the hollow body of the product obtained in this way was good without any disturbance of the fiber or void.
  • the function of the core is to support the clamping force generated by the thermal expansion of the core during clamping, and to define the position of each thermal expansion element. Therefore, the core is required to have mechanical properties such as strength and rigidity at the temperature used, as well as partitions, irregularities, or the like that restrain the thermal expansion element. (Otherwise, depending on the shape of the heat-expandable element, these may not be necessary). In addition, it is preferable to have appropriate means for promoting heating and controlling cooling.
  • the interior of the core may be hollow or solid. Further, it is preferable that the core is constituted so that it can be disassembled as needed.
  • core components consists of only a plurality of thermally expandable elements.
  • the problem of non-uniform product quality due to heat conduction can be ignored.
  • Good products can be obtained by using a child. Therefore, in this case, it is not necessary to use a core with a core body.
  • FIG. 19 ( ⁇ ) shows a case where three core-shaped heat-expandable elements 71 are fitted into the core body 70.
  • FIG. 19 ( ⁇ ) shows a case where one ring-shaped heat-expandable element 71 is fitted into the core body 70.
  • a single thermal expansion element corresponds to a solid or hollow mandrel.
  • the diameter and size of each of the ring-shaped thermally expandable elements can be changed according to the shape of the product.
  • the means for connecting the heat-expandable element and the core include, for example, a convex portion of a partition provided on the core, Any of a surface unevenness provided on the core body, some mechanism of the outer mold, and a mechanism independent of the core body and the outer mold may be used.
  • the heat-expandable elements need not be in close contact with each other, but are designed in advance so that the matrix of the molding material expands and adheres to the core surface before the flow of the molding material starts to flow.
  • the heat-expandable elements may be connected to each other by fitting each other like a puzzle.
  • the heat-expandable elements when individually subjected to a high thermal expansion force in the X, Y, and z directions, and under a high compressive stress as in the present invention, may appropriately elastically or plastically deform to fill the void. To expand. For this reason, it is not always necessary to design a thermally expandable element assuming isotropic thermal expansion based on the shape of the thermally expandable element during heat deformation.
  • the heat-expandable element is reinforced to give a significant anisotropy to the heat-expandability (in extreme cases, it expands only in the X direction and expands in the ⁇ and ⁇ directions). It is possible to use only the effective direction of expansion (in this case, to match the X direction to the product normal).
  • a heat-expandable element containing a filler having high heat conductivity may be used.
  • a composite having a plurality of thermal expansion elements arranged on the surface of a core body is used as a core, for example, as shown in FIG. 15, a cavity 62 having a circular or elliptical cross section is formed.
  • the inner surface of the cavity 62 of the outer mold 61 through transmural to 3 ⁇ 4 other end from over end, the lateral surface the circular also a thermoplastic resin prepreg is wound to a desired layer constitution, the hollow winding of oval 63.
  • the material of the outer die 61 is not particularly limited. However, since it is necessary that the outer die 61 is not deformed or deteriorated at the processing temperature and that it withstands the pressure caused by the expansion of the heat-expandable element, It is preferably made of metal such as aluminum or aluminum alloy.
  • the outer die 61 may be an integral type, but is preferably a split type that can be split into two upper and lower parts and can be clamped with a bolt or the like because it is easy to take out the product.
  • thermoplastic resin prepreg is wound around the inner surface of the cavity 62 of the outer die 61 so as to have a desired layer configuration.
  • thermoplastic resin pre-preda since the thermoplastic resin pre-preda is in the form of a cured sheet, for example, it may be spirally wound into the cavity 62. Also, when winding in a spiral shape, spot welding may be performed on the pre-preda with a soldering iron or the like to temporarily fix it. A release agent or the like may be applied to the inner surface of the cavity 62 in advance.
  • a core 66 having a cross-sectional elliptical shape composed of a core 64 and a plurality of mature expandable elements 65 arranged around the core 64 is used to form a hollow roll 63 Insert into the hollow part.
  • the core body 64 is deformed and deteriorated at the processing temperature, like the outer mold 61.
  • the material is not particularly limited because it is necessary to prevent the occurrence of pressure and to withstand the pressure caused by the expansion of the thermally expandable element, but it is made of metal such as iron or aluminum alloy. Is good. Further, it may not be solid and may be hollow or hollow. It is preferable that the core 64 itself be hollow or hollow because the weight of the core 64 itself is reduced and the thermal conductivity is improved.
  • the thermal expansion element 65 shows isotropic thermal expansion (some anisotropy may remain due to molding conditions, etc., but it is considered macroscopically isotropic). ). Therefore, as shown in FIG. 16, the thermally expandable elements 65 are arranged with a gap therebetween. In addition, if necessary, a metal foil or the like may be disposed between the thermally expandable elements 65 to prevent the elements from being welded to each other.
  • the hollow roll 63 into which the core 66 has been inserted is heated.
  • Heating may be performed by placing the entire outer mold 66 in a heating furnace (preferably a hot blast furnace or a degreasing furnace).
  • the heating temperature is 30 higher than the melting point of the matrix resin of the pre-preda. c-100. c should be higher.
  • the heating time may be a time during which the whole reaches the ambient temperature. Due to this heating, the heat-expandable element 65 thermally expands in the X, Y, and Z directions of length, width, and height, and as shown in FIG.
  • the object 63 is pressed from the inside toward the outer mold 61 to uniformly clamp the hollow wound article 63 over the entire circumference.
  • a pre-precast (APC-2 / AS4, manufactured by ICI Fiberite) using PEEK as a matrix is ⁇ 45.
  • a total of 24 brushes, each of 12 brushes, is mounted so as to have a thickness of just 3.0 mm, and a PTFE heat-expandable element 65 is further disposed inside, and a Further, an aluminum core 64 was mounted.
  • This is placed in a hot-air oven maintained at 400 mm, and kept for 60 minutes. As shown in FIG. 17, the heat-expandable elements 65 adhere to each other, and there is no gap between the layers of the hollow roll 63. After confirming that it was in place, the whole was taken out of the oven and cooled, and as shown in Fig. 18, there was no void or fiber disturbance, and an ellipse that was both excellent in appearance and characteristics A panel was obtained.
  • This elliptical spring had a ring width of 50 mm, a minor axis of 77 mm, a major axis of 154 mm, a wall thickness of 3 mm, and a VF of 0.61.
  • the same elliptical spring was obtained as in Example 11, except that the lamination structure was such that the lamination was alternately laminated at 0 ° and 90 ° (outermost layer at 0 °).
  • thermoplastic fibers reinforced by continuous fibers When molding with a composite material using resin as matrix, it is necessary to (1) realize the fiber orientation without disorder as designed, (2) eliminate the laminated body, or (3) vary the distribution of arrowheads. As a result, it is important in terms of performance whether there is any place where the resin pool is generated. This is because there is no fiber turbulence, no laminated voids, and no separation between the arrowhead fibers and the resin, which guarantees the high performance of the product. Conversely, if there are locations that do not satisfy these points, the locations will be weak and the blasting will proceed from there, leading to poor performance. Therefore, for the products obtained in Examples 11 and 12, a large number of test pieces were cut out and subjected to a bending test to see these points. It was found that the composition exhibited excellent performance satisfying these points with very little homogeneity.
  • the processing temperature was maintained at 330, and the core 64 and the heat-expandable element 65 were used.
  • the procedure was the same as in Example 11, except that an aluminum plate having a thickness of 1.0 mm was sandwiched between the two.
  • Bench lily tube (layer structure of ⁇ 45 ° with respect to the facet):
  • the product 72 (bench lily tube, diameter 10 cm) shown in Fig. 20 is replaced with the outer die 73 (split type) shown in Fig. 23.
  • the inner surface is subjected to tephron processing for release), and a core 82 comprising a core body 80 shown in FIG. 21 and a PTFE thermal expansion element 81 shown in FIG. 22.
  • the core 82 has a structure that can be disassembled, and after the product is completed, it can be disassembled and the product can be taken out of the core 82).
  • a pre-prepader using PEEK as a matrix ( ⁇ 3 mm wide, 0.13 mm thick, APC-2 / AS4., ICI), braided with a blade, 45.
  • a total of 16 preforms with a total of weaving angles were formed.
  • the wall thickness of the preform of this Venturi tube was about 5 mm, which was about 2.5 times the thickness of the finished product of 2 mm.
  • the preform was spotted where it was deemed necessary to prevent fragmentation.
  • a core 80 shown in FIG. 21 was partially disassembled and passed through the preform, and a heat-expandable element 81 was arranged on the core 80 to assemble a core.
  • the thermal expansion elements 81 Although there was a small gap, when the processing temperature was reached, the gap disappeared, and the heat-expandable element 81 pressed the preform to the outer mold 73 and took care to clamp the mold.
  • the entire preform and core were placed in an outer mold 73 shown in FIG. 23 to prevent the outer mold 73 from opening, and then sent to the next step.
  • an outer mold 73 a split mold is used because it is necessary to take out the product, and a Teflon coating is applied to the inner surface for release.
  • the flange 83 prevents the axial movement of the core body 80 of the thermally expandable element 81 because the nut 85 prevents the core body 80 from moving outward in the axis direction. Effectively causes thermal expansion in the radial direction.
  • the flange 83 also prevents the thermal expansible element 81 from being quenched by contact with water during cooling, thereby causing the thermal expansible element 81 to contract before the matrix of the product solidifies. Prevents peeling from the product due to excessive application, or interlayer voids due to insufficient mold clamping.
  • 84 is a sleeve with a taper section.
  • the core and outer mold were disassembled and demolded to obtain a product.
  • the core can be disassembled by removing nut 85.
  • the obtained product was very uniform in appearance first, had no irregularities in the weaving angle, no wrinkles, voids, irregularities on the inner and outer surfaces, and had extremely good dimensional accuracy.
  • a part of this product was sampled as a test sample, which was subjected to a static mechanical test. As a result, it was clarified that this product exhibited the expected strength and rigidity, had sufficient mechanical properties, and sufficiently exhibited the performance of the thermoplastic resin matrix.
  • a one-way aligned prepreg tape (width: about 30 cm, thickness: about 0.13, APC-2 / AS4, manufactured by IC1 company) using PEEK as a matrix is cut into a predetermined layer structure.
  • This strip was wound into a cylindrical shape with the same outer circumference, and spots were stopped at several places where it was deemed necessary to prevent loosening.
  • the preform thus obtained was placed in an outer mold subjected to a mold release treatment in the same manner as in Example 14 while deforming. After preventing the outer mold from opening, the core was assembled in the preform.
  • the core 91 was made of metal square pie as shown in Figs. 25 (A) and (B). (The movement of the thermal expansion element in the axial direction of the core body 91 is prevented by the flange 94), and a groove 93 is formed on the surface in contact with the thermal expansion element made of PTFE. Carved. The groove 93 is used for the thermal expansion shown in FIGS. 26 (A) and (B), This is a measure to prevent the core body 91 from expanding in the axial direction each time.
  • the heat insulating material is not wound around the outer end of the outer die as in the fourteenth embodiment.
  • the core body 91 is a hollow square pipe, so that the temperature rises sufficiently quickly from the center of the product 90, and substantially no trouble occurs.
  • the product has a longer length even with the same structure core, it is better to wind the heat insulating material as in the fourteenth embodiment.
  • the core and outer mold were disassembled and demolded to obtain the product.
  • the obtained product was extremely well-balanced in appearance, as in Example 14, was free from irregularities in the constituent angles, no wrinkles, voids, irregularities on the inner and outer surfaces, and had extremely good dimensional accuracy.
  • a part of this product was sampled as a test sample and subjected to a static mechanical test. As a result, it was clarified that this product exhibited the expected strength and rigidity as in Example 14, had sufficient mechanical properties, and sufficiently exhibited the performance of the thermoplastic resin matrix.
  • Example 14 had sufficient mechanical properties, and sufficiently exhibited the performance of the thermoplastic resin matrix.
  • Elliptic tube ( ⁇ 45 °, major axis 10 cm, minor axis 6 cm, wall thickness 1, Fig. 27 (A), (B)):
  • One-way alignment pre-reading with PPS as matrix One piece was cut into a predetermined layer structure, and was further spliced into a band.
  • This belt-shaped apricot outer circumference was wound in a cylindrical shape that matched, and several spots were stopped at places considered to be necessary to prevent loosening.
  • the preform obtained in this manner was placed in an outer mold subjected to release treatment in the same manner as in Example 14, while being deformed. After preventing the outer mold from opening, the core was assembled in the preform.
  • the core body 101 was made of aluminum, as shown in Figs. 28 (A) and (B).
  • the thermal expansion element 105 is composed of a metal plate 102 and a flange 103 (the movement of the thermal expansion element to the outside of the axis of the core body 101 is prevented by the flange 103), and the thermal expansion element made of PTFE is used.
  • a groove 104 is carved on the surface in contact with.
  • the groove 104 is a means for preventing the mature expandable element 105 shown in FIGS. 29 (A) and 29 (B) from excessively expanding in the axial direction of the core body 101. Since there is relatively little contact between each of the thermal expansion elements 105 and the core 101, the grooves 104 are engraved more.
  • a silicone resin with fiber reinforcement in the axial direction was used for the thermal expansion element 105.
  • Example U The obtained product 100 is extremely well-balanced in appearance, as in Example U, and has no irregularities in the constituent angles, no wrinkles, voids, irregularities on the inner and outer surfaces, and extremely good dimensional accuracy. Met.
  • a part of the product 100 was taken as a test sample and subjected to a static mechanical test. As a result, this product 100 exhibited the expected strength and toughness as in Example 14, had sufficient mechanical properties, and could sufficiently exhibit the performance of the thermoplastic resin matrix. It became clear.
  • the preformed ribs were housed in two grooves 113 on the core 112 in FIG.
  • a plain weave of commingled yarn made of PEEK yarn and carbon fiber is slanted45.
  • the cut piece was tightly wound by a predetermined amount.
  • a 35-m-thick copper foil was wrapped around it as a mold release mold. The whole was inserted into the outer mold (integral type, not split type), and both ends of the outer mold were closed with flanges 114 of the core 112. After replacing the inside of the outer mold with nitrogen gas (N 2 ), the nuts 115 at both ends of the core 112 were tightened so that no gap was formed.
  • N 2 nitrogen gas
  • the core 112 has a PTFE heat-expandable element 117 as shown in FIGS. 32 (A) and (B) arranged on a core body 116 shown in FIG.
  • the core 116 is made of iron parts, It can be disassembled by removing nut 115.
  • the outer surfaces of both ends of the outer mold were wound with a heat insulating material for the same purpose as in Example 14.
  • the reason why the molding material was heated in the N 2 atmosphere is to prevent the surface of the carbon fiber from being affected by oxidation or the like, thereby preventing a problem in forming an interface with PEEK.
  • This is a common practice when using a pre-preda with no interface formed.
  • the holding time of about 20 minutes after the whole reached almost 400 was to ensure that the impregnation and dispersion of the polishing on the carbon fibers was sufficiently achieved. This is also a common means when using a molding material that is immersed during molding.
  • the core 112 was disassembled, and 11 products to which the copper foil was attached were extracted from the outer mold.
  • Copper foil can be easily removed from product 110, but as an alternative, immerse product 110 with copper foil in a chemical solution that dissolves copper (for example, ferric chloride solution) to remove the copper foil. You may.
  • the resulting product 110 is extremely well-balanced in appearance, free from irregularities in constituent angles, wrinkles, voids, and irregularities on the inner and outer surfaces.
  • the dimensional accuracy was also very good, and the mounting portion of the rib 111 on the inner surface was smoothly fused and integrated.
  • a part of the product 110 was taken as a test sample and subjected to a static mechanical test.
  • this product 100 shows the expected strength and rigidity as in the other examples, has sufficient mechanical properties, and fully demonstrates the performance of the thermoplastic matrix. Became clear.
  • a preform having an outer diameter that can be exactly inserted into the outer mold was formed using a pre-preeder tape using PEEK, which is the same material as in Example 15, as a matrix. This was inserted into the outer mold of a 1.0 mm thick seamless copper tube.
  • Fig. 47 shows the temperature profile of the molding material during the heating process.
  • the core inside the molding material 129 is thermally expanded sequentially from the center to the end, and as indicated by the arrow 128 It is made to wash out in the direction to prevent shrinkage, sagging, and voids.
  • the outer mold was removed with a chemical solution that dissolves copper (here, a sulfuric acid / hydrogen peroxide aqueous solution was used, but a ferric chloride solution or the like can also be used) to obtain a product 120.
  • a chemical solution that dissolves copper here, a sulfuric acid / hydrogen peroxide aqueous solution was used, but a ferric chloride solution or the like can also be used
  • the ridge of the rod 121 has the function of stopping the nut 122 (both ends) and the unevenness that prevents the thermal expansion element 124 from moving too much in the axial direction of the core body 123. It also has the function of Therefore, the existing screw rod can be used as the rod 121, which is economical.
  • the nut 122 prevents the thermally expandable element 124 from overexpanding, also outwardly in the axial direction.
  • thermal expansion occurs sufficiently in the radial direction of the core body 123 at the end of the product 120, and mold clamping is sufficiently realized.
  • nuts in the cooling process The function of the dead volume near the end of the thermal expansion element 124 blocked by 2: 2 also realizes mold clamping in the cooling process similar to that shown in FIG.
  • the corner of the pipe at the left end in Fig. 36 is Work as Dead Bolly Yuum.
  • Figures 50 (A), (B) and (C) illustrate the effect of dead volume on ensuring mold clamping during the cooling process.
  • the thermal expansion element 130 between the product 134 and the core 131 moves along the cooling butter shown in FIG. Has achieved sufficient mold clamping (Fig. 50 (A)), and a slight excessive expansion of the thermal expansion element 130 forms a curved portion 132 so as to crush the dead volume and protrude.
  • Fig. 50 (A) sufficient mold clamping
  • a slight excessive expansion of the thermal expansion element 130 forms a curved portion 132 so as to crush the dead volume and protrude.
  • the overhang to the dead volume disappears while the mold clamping is maintained, and the curved portion 132 changes to the bent portion 133 (FIG. 50 ( B))).
  • Fig. 49 shows the cooling pattern during the cooling process of the product at the processing temperature.
  • the product at the processing temperature cools, it reaches the melting point of the matrix at time a.
  • the temperature of the heat-expandable element should be reduced only slightly. In this way, voids due to insufficient mold clamping and demolding of the core before solidification of the product do not occur.
  • thermal expansion element 124 many short ones are used because of the use of ready-made pipes, but long ones can be used without any problem.
  • the total length of these heat-expandable elements is 85% of the distance between the nuts of the core.
  • the outer die unlike the other embodiments, uses a copper seamless pipe that cannot be reused.
  • (1) the initial cost is low because there is no need to prepare a separate outer mold.
  • (3) The inner surface of the mold is smooth due to the seamless wrapping, which has the advantage that the appearance of the product is particularly excellent.
  • drawbacks such as the need for a high price for making a seamless rope of a rope, and the necessity of a facility for melting copper seamless pipes.
  • pipes can be manufactured more efficiently if they are properly used according to the application.
  • the obtained product 120 has the most beautiful outer surface of all the examples because there are no split seam lines and no overlapping line of release molds. There were no irregularities on the inner and outer surfaces, voids, and the dimensional accuracy was extremely good.
  • a part of the product 120 was collected as a test sample and subjected to a static mechanical test. As a result, it exhibited the expected strength and strength as in the other examples, and the mechanical properties sufficiently exhibited the performance of the thermoplastic resin matrix.
  • a core 141 On a core 141 that can be divided and has a partition plate on the surface as shown in Fig. 38, Fig. 39 (A) The thermally expandable elements 142a and U2b (each having a thickness of about 2 cm) made of PTPE shown in Fig. 39 were interconnected and spread as shown in Fig. 39 (B). A preform was formed on this core using a braider using the same material as in Example 14.
  • Fig. 38 shows the case of splittable iron
  • Fig. 3 shows a core composed of a hollow body.
  • a partition plate 143 On the surface of the core 141, a partition plate 143 is provided to restrict the movement of the thermal expansion element.
  • the core and the outer mold were disassembled and removed to obtain a product 140.
  • the outer surface of the obtained product 140 was partially discolored due to the release agent, but was extremely uniform in appearance except for this discoloration. Further, the product 140 was free from irregularities in the constituent angles, the seams, the voids, and the irregularities on the inner and outer surfaces, and had extremely good dimensional accuracy.
  • a portion of this product 120 was taken as a test sample and subjected to a static mechanical test. As a result, it was excellent as in the other examples.
  • FIG. 40 shows a cross section of a part of the core, in which a thermal expansion element 142 is partitioned by a partition plate 143 of the core 141.
  • the individual heat-expandable elements 142 expand to the size shown by the dotted lines to become the expansion elements 144, which together form the core surface.
  • FIG. 41 shows where the metal member is inserted into the hollow body.
  • a molding material 153, a metal part 154, and a preformed reinforcing ring 155 are charged into a space between the outer die 151 and the thermal expansion element 152 of the core.
  • the product 156 was obtained in the same manner as described above.
  • the insert part of the metal member of the product 156 is as shown in FIG. 42, and a structure that can obtain the initial performance is realized.
  • the preform was knitted with a blader on the tapered core 160 shown in Fig. 45 using a pre-preed toe having PEEK as a matrix.
  • FIG. 48 shows a temperature profile in a case where the heater is turned on from one end to the other end.
  • Polyimide film is attached to the product, It can be easily removed by dipping in an alkaline solution.
  • the obtained product 164 was sufficiently excellent in both appearance and mechanical performance as in the other examples.
  • the core 160 used here is composed of only a thermal expansion element without using a core. Cores used to obtain relatively thin or small products may omit the core in this way. This is because, in this case, the heat transfer does not take too much time, a large amount of expensive heat-expanding elements are not required, and the performance of the product is not a problem.
  • the obtained product was almost uniform in appearance, except that the wrinkles of the vacuum pack were picked up, and there was no disturbance in the void angle.
  • thermoplastic resin hollow body can be efficiently produced.
  • the hollow body obtained by the present invention is not only used as a lightweight and high-strength member under harsh usage environments, but also utilizes the characteristics of the thermoplastic resin matrix. It can be used for single-shell structures, torque tubes, pressure vessels, and truss structures in outer space.

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Abstract

Selon un procédé de production d'un article creux en résine thermoplastique renforcée par des fibres, on place une feuille préimprégnée contenant une résine thermoplastique en tant que matrice entre un noyau thermo-expansible et une étampe extérieure qui entoure le noyau.
PCT/JP1990/000192 1989-02-20 1990-02-19 Production d'articles creux en resine thermoplastique renforcee par des fibres WO1990009272A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2503370A JPH074878B2 (ja) 1989-02-20 1990-02-19 繊維補強熱可塑性樹脂中空体の製造方法

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
JP1/38205 1989-02-20
JP3820589 1989-02-20
JP1/104535 1989-04-26
JP10453589 1989-04-26
JP22038389 1989-08-29
JP1/220383 1989-08-29
JP29393289 1989-11-14
JP1/293932 1989-11-14

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5585062A (en) * 1993-12-29 1996-12-17 Toho Rayon Co., Ltd. Process for making a cylindrical product of fiber reinforcement-thermoplastic resin composite
RU2488486C1 (ru) * 2012-03-02 2013-07-27 Федеральное государственное унитарное предприятие "Всероссийский научно-исследовательский институт авиационных материалов (ФГУП "ВИАМ") Способ изготовления полых изделий из композиционных материалов
CN103373834A (zh) * 2013-07-05 2013-10-30 燕山大学 三氧化二铝-聚醚砜-硅酸铝陶瓷纤维阻燃保温复合材料的制备方法
CN117656538A (zh) * 2024-02-02 2024-03-08 哈尔滨远驰航空装备有限公司 一种异形空心管件的成型模具及成型方法
CN117681458A (zh) * 2024-02-02 2024-03-12 哈尔滨远驰航空装备有限公司 一种航空多向连接管件及其成型方法

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JPS5422470A (en) * 1977-07-21 1979-02-20 Fujikura Rubber Works Ltd Fiber reinforced resin pipe and manufacture of its complex pipe
JPS54161676A (en) * 1978-06-12 1979-12-21 Sekisui Chem Co Ltd Mold for reinforced plastic pipe
JPS5562930A (en) * 1978-11-01 1980-05-12 Yunipura Kk Laminate impregnated with thermoplastic resin and method of making the same
JPS5591628A (en) * 1978-12-28 1980-07-11 Union Carbide Corp Method of impregnating fibrous knit textile matter
JPS6159230B2 (fr) * 1981-12-18 1986-12-15 Sekisui Kagaku Kogyo Kk
JPS62198448A (ja) * 1986-02-24 1987-09-02 デビツド　ヤン 複合材料製の管様部材の製法

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JPS5087170A (fr) * 1973-12-05 1975-07-14
JPS5422470A (en) * 1977-07-21 1979-02-20 Fujikura Rubber Works Ltd Fiber reinforced resin pipe and manufacture of its complex pipe
JPS54161676A (en) * 1978-06-12 1979-12-21 Sekisui Chem Co Ltd Mold for reinforced plastic pipe
JPS5562930A (en) * 1978-11-01 1980-05-12 Yunipura Kk Laminate impregnated with thermoplastic resin and method of making the same
JPS5591628A (en) * 1978-12-28 1980-07-11 Union Carbide Corp Method of impregnating fibrous knit textile matter
JPS6159230B2 (fr) * 1981-12-18 1986-12-15 Sekisui Kagaku Kogyo Kk
JPS62198448A (ja) * 1986-02-24 1987-09-02 デビツド　ヤン 複合材料製の管様部材の製法

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Publication number Priority date Publication date Assignee Title
US5585062A (en) * 1993-12-29 1996-12-17 Toho Rayon Co., Ltd. Process for making a cylindrical product of fiber reinforcement-thermoplastic resin composite
US5840347A (en) * 1993-12-29 1998-11-24 Toho Rayon Co., Ltd. Apparatus for making a cylindrical product of fiber reinforcement-thermoplastic resin composite
RU2488486C1 (ru) * 2012-03-02 2013-07-27 Федеральное государственное унитарное предприятие "Всероссийский научно-исследовательский институт авиационных материалов (ФГУП "ВИАМ") Способ изготовления полых изделий из композиционных материалов
CN103373834A (zh) * 2013-07-05 2013-10-30 燕山大学 三氧化二铝-聚醚砜-硅酸铝陶瓷纤维阻燃保温复合材料的制备方法
CN103373834B (zh) * 2013-07-05 2014-11-26 燕山大学 三氧化二铝-聚醚砜-硅酸铝陶瓷纤维阻燃保温复合材料的制备方法
CN117656538A (zh) * 2024-02-02 2024-03-08 哈尔滨远驰航空装备有限公司 一种异形空心管件的成型模具及成型方法
CN117681458A (zh) * 2024-02-02 2024-03-12 哈尔滨远驰航空装备有限公司 一种航空多向连接管件及其成型方法
CN117656538B (zh) * 2024-02-02 2024-04-26 哈尔滨远驰航空装备有限公司 一种异形空心管件的成型模具及成型方法
CN117681458B (zh) * 2024-02-02 2024-04-26 哈尔滨远驰航空装备有限公司 一种航空多向连接管件及其成型方法

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