JP2011073160A - Method of molding fiber-reinforced resin-made cheese - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of molding a fiber-reinforced resin-made cheese having no wrinkle, excellent in appearance, and capable of holding strength. <P>SOLUTION: In the method of molding the fiber-reinforced resin-made cheese, cylindrical tubes having ends cut at approximately 45 degrees are abutted on cut surfaces at an approximately right angle, the joining part and the cylindrical outer surface of all over the peripheral edge are wrapped by a fiber-reinforced material, the fiber-reinforced material is air-tightly covered with a bag film on the cylindrical tube, a pressure reducing line for reducing the inside of the bag film to a vacuum state, and an injection line for injecting the resin into the bag film are connected, a fluid resin is sucked and injected in the bag film at the reduced pressure, and the resin is solidified to mold a right-angled cylindrical tube. After that, the top of the cylindrical tube is cut into the approximately 45 degrees with the equivalent size to the raw material cylindrical tube, the tube is abutted on the other cylindrical tube having the equivalent size to the raw material cylindrical tube having the end cut at the approximately 45 degrees at a right angle on the cut surfaces to form a cheese shape, the cylindrical outer surface of the joining part and the cylindrical outer surface of all over the peripheral edge are wrapped by the fiber-reinforced material, the fiber-reinforced material is air-tightly covered with the bag film on the cylindrical tube, the pressure reducing line for reducing the inside of the bag film to the vacuum state and the injection line for injecting the resin into the bag film are connected, and a fluid resin is sucked and injected in the bag film at the reduced pressure to cure the resin. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method for forming a fiber-reinforced resin cheese.

  Fiber-reinforced resin molded bodies have been widely used because they are lightweight and have high strength. For forming the tubular body, a hand lay-up molding method, a filament winding method, and a sheet winding method are generally used. In the hand lay-up molding method, the mold is manually impregnated with a brush or roller and laminated to a predetermined thickness while defoaming. The filament winding method impregnates continuous fibers with resin. In the sheet winding method, a rotating mandrel (which is often made of a cylindrical metal) is wound at an appropriate winding angle and formed into a predetermined shape (see, for example, Patent Document 1). A woven fabric of the reinforcing fibers thus obtained is wound helically around the core material, and the woven fabric is impregnated with resin and cured (see, for example, Patent Document 2).

  However, since these molding methods are wound around a mold while impregnating a fluid liquid resin into a reinforcing fiber, the resin is not yet solidified and cannot be confirmed by direct contact. It is difficult to control the thickness, and if a curing agent is mixed, the curing progresses over time, so the work cannot be interrupted. This is not preferable and expensive, and there is a problem that styrene or the like is volatilized during the production.

On the other hand, in recent years, various vacuum injection molding methods have been proposed in which molding is performed under reduced pressure such as by vacuum suction.
The basic technique of this vacuum injection molding method is disclosed in, for example, Patent Document 3, in which a fiber layup layer is disposed in a mold and an injection pipe for resin distribution is disposed thereon. Then, it is encapsulated with a bag film, and its periphery is sealed, and a resin is injected into the vacuum-sucked bag film, and there is Patent Document 4 as a similar product.

  However, there are various problems in using such a vacuum injection molding method for fiber-reinforced resin tubular bodies, particularly fiber-reinforced resin cheeses. For example, when a rotating cylinder type / cylindrical product is coated in a dry state without impregnating resin with the required amount of reinforcing fiber and the required wall thickness, the sheet-like reinforcing fiber is wrapped around the cylindrical type / cylindrical product as it is to create a vacuum. The excessively compressed portion of the fiber is wrinkled in the axial direction, and this wrinkle not only deteriorates the appearance of the molded product but also decreases the strength.

Japanese Patent Publication No. 06-26858 JP 2007-136997 A JP-A-10-504001 JP-A-60-83826

  The problem of the present invention is that, under such circumstances, there is no trouble of vaporization and scattering of the solvent in the resin, styrene, etc., the working environment is improved, wrinkles are not generated, the appearance is good, and the strength is maintained. An object of the present invention is to provide a molding method capable of providing reinforced resin cheese.

  As a result of diligent research to solve the above-mentioned problems, the inventors of the present invention used cylindrical tubes cut at approximately 45 degrees, butted them at a right angle, and processed them into a vacuum injection molding method to form a right-angle bent cylindrical tube, We found that cutting the top of the cylindrical tube at about 45 degrees and subjecting it to a cheese tube with a cylindrical tube cut at about 45 degrees at the end will help solve the problem. The present invention has been made based on this finding.

  That is, according to the first invention of the present invention, after the cut surfaces are butted and fixed so that the cylindrical tubes whose ends are cut at approximately 45 degrees are arranged at approximately 90 degrees, the outer periphery of the butted portion And the outer peripheral surface of the cylinder are covered with a fiber reinforcement, and the fiber reinforcement is hermetically covered with a bag film on the cylindrical tube, and the bag film is decompressed to a vacuum state and the bag film An injection line for injecting resin is connected, and a flowable resin is sucked and injected into the bag film under reduced pressure. The resin is solidified to form a right-angled cylindrical tube, and then the top of the cylindrical tube is the raw material cylinder. Cut to approximately 45 degrees in the same size as the tube, and this is aligned with another cylindrical tube of the same size as the above-mentioned raw material cylindrical tube, the end of which is cut at approximately 45 degrees, at a right angle in their cut surfaces. Cheese shape and The joint and the outer circumferential surface of the joint are covered with a fiber reinforcing material, and the fiber reinforcing material is hermetically covered on the cylindrical tube with the bag film, and the bag film is decompressed to a vacuum state and the bag film. An injection line for injecting a resin is connected to the inside, a flowable resin is sucked and injected into the bag film under reduced pressure, and the resin is solidified to provide a method for forming a fiber reinforced resin cheese.

  According to a second aspect of the present invention, there is provided a fiber reinforced resin cheese molding method characterized in that, in the first aspect, the enveloping is performed by winding.

  Further, according to the third invention of the present invention, in the second invention, the winding is performed on one end face while shifting the positions of the plurality of fiber reinforcing materials cut into a predetermined length in the circumferential direction. A fiber-reinforced resin cheese molding method is provided, in which only the two are bonded and laminated in a substantially windmill shape.

  According to a fourth invention of the present invention, in the third invention, the fiber is characterized in that the fiber is laminated so that both end surfaces become gentle by shifting the fiber reinforcing material also in the width direction. A method for forming a reinforced resin cheese is provided.

  According to a fifth aspect of the present invention, in the third aspect, the fiber reinforced resin cheese is formed by sequentially laminating fiber reinforcing materials having slightly different widths and smoothing both end faces. A method is provided.

  According to the molding method of the present invention, measurement can be confirmed by directly touching whether a predetermined thickness has been reached, work can be interrupted when trouble occurs before the resin is supplied, and bag film can be formed by infusion molding. Since the resin is injected while covered with the above, there is no trouble of vaporization and scattering of the solvent, styrene, etc. in the resin as in the conventional open molding, the working environment is improved, and the fiber reinforcing material is abbreviated as described above. By laminating in the shape of a windmill, there is no problem of wrinkling due to sagging of fiber reinforcement material unique to infusion cylindrical tube molding, and high quality molded products without strength reduction can be obtained, and laminating by shifting the width direction By doing so, both end surfaces become smooth, the thickness change of the cylindrical tube and the laminated portion is reduced, and a molded product free from stress concentration can be obtained.

It is a schematic diagram of the cylindrical pipe | tube used for the shaping | molding method of this invention by which one end was cut | disconnected by about 45 degree | times. In the shaping | molding method of this invention, it is a schematic diagram of the right angle | corner cylindrical tube once shape | molded in the formation process. It is the schematic diagram of the part for cheese which cut | disconnected the top part of the right-angle bend | circular bending cylindrical pipe | tube of FIG. In the shaping | molding method of this invention, it is a schematic diagram of the process of shape | molding the fiber-reinforced resin cheese from the parts for cheese of FIG. 3, and the cylindrical pipe | tube by which the end was cut | disconnected at about 45 degree | times. It is a schematic diagram of the example of arrangement | positioning of the sheet-like fiber reinforcement used for the shaping | molding method of this invention. It is a lamination example of the fiber reinforcement used for the shaping | molding method of this invention.

  In the molding method of the present invention, first, two cylindrical tubes whose one ends are cut at about 45 degrees are prepared, and the cut surfaces are butted and fixed so that they are arranged at about 90 degrees. The fixing may be temporary fixing, and can be easily performed by, for example, applying an adhesive or a pressure-sensitive adhesive to the cut surface.

Next, the outer peripheral portion of the butt portion and the outer circumferential surface of the peripheral portion are covered with a fiber reinforcing material.
Examples of the reinforcing fibers constituting the fiber reinforcing material include inorganic fibers such as glass fibers and carbon fibers, and organic fibers such as aramid fibers. Examples of the fiber reinforcing materials include glass cloth, carbon cloth, and Kevlar cloth. Knitted fabrics, non-woven fabrics, chopped strand mats, stitch mats, stitch cloths, and combinations of these layers.
Examples of the fiber reinforcing material include those in the form of a binder that is wound directly on the outer peripheral surface of a cylindrical tube, and sheet-like materials that have been cut to a predetermined length. A large number of these sheet-like materials are used. While substantially shifting the position in the circumferential direction, only one end is bonded, and the other end is disposed so as to overlap the outer surface of the adjacent sheet-like material so that it is overlapped along the circumferential direction. Arranged in a shape. Further, in addition to shifting the position in the circumferential direction as described above, the sheet-like material is also shifted in the width direction, or by sequentially laminating fiber reinforcing materials with slightly different widths, both end surfaces are gently It is preferable to laminate so as to be. As the size of the sheet-like material, for example, the outer circumference of the cylindrical tube has a size corresponding to the length of about 2 to 6 divisions, or is further divided into higher order (for example, 7 to 50 divisions) so as to overlap multiplely. And so on.

  Next, this fiber reinforcement is hermetically covered with a bag film on a cylindrical tube, and a pressure reducing line for reducing the pressure inside the bag film to a vacuum state and an injection line for injecting resin into the bag film are connected to reduce the pressure inside the bag film. A flowable resin is sucked and injected below to solidify the resin, thereby forming a right-angle bent cylindrical tube.

Next, the top of the right-angled cylindrical tube is cut to approximately 45 degrees with the same size as the raw material cylindrical tube, and this is cut into another cylinder of the same size as the raw material cylindrical tube with the end cut to approximately 45 degrees. Tubes and their cut surfaces are aligned at right angles to form a cheese shape, and the joint and the outer peripheral cylindrical surface of the cylinder are covered with a fiber reinforcing material, and the fiber reinforcing material is hermetically sealed on the cylindrical tube with a bag film. A pressure reducing line for depressurizing the inside of the bag film to a vacuum state and an injection line for injecting the resin into the bag film are connected, and a fluid resin is sucked and injected into the bag film under reduced pressure to solidify the resin.
In this way, a desired fiber-reinforced resin cheese is formed.

In the molding process, it is preferable to cover the release material and the resin diffusion member with the bag film in addition to the fiber reinforcing material. The bag film is not particularly limited as long as it is an airtight synthetic resin film material generally used in this type of vacuum injection molding method. And it is preferable that a bag film adheres to the surface of a cylindrical tube in the peripheral part of a cylindrical tube using sealing materials, such as an adhesive material. Thereby, between a cylindrical tube and a bag film can be comprised as an airtight and airtight molded part.
The mold release material enhances the mold release property of the solidified injection resin, and a sheet made of the injection resin and a non-adhesive material is preferable.
The resin diffusion member promotes the diffusion of the injected resin. The resin diffusion member impregnates the injected resin into the fiber reinforcing material evenly and can diffuse the injected resin over the entire desired range on the cylindrical tube. A material is preferred.
The resin diffusing member may not be used as long as it can be molded depending on conditions such as the type and thickness of the fiber reinforcing material.
Further, as the injection resin, for example, a low-viscosity vinyl ester resin, unsaturated polyester resin, vinyl ester resin, epoxy resin, phenol resin, isocyanate resin, bismaleimide resin and the like are preferable.

Moreover, as a pressure reduction line which decompresses the inside in a bag film, ie, the inside covered with a bag film, to a vacuum state, the thing which attached the vacuum suction port to the vacuum pump etc. is mentioned, for example. Examples of the injection line include those in which a resin injection port is connected to a connector for supplying resin from a resin storage tank, and those in which an injection tube is inserted into a bag film so as to be in contact with a resin diffusion member. Is preferably performed after confirming that a predetermined vacuum pressure has been reached and there are no wrinkles. After the resin is injected, heat is applied when a thermosetting resin is used, or the resin is cured and molded when a curing agent is added to the resin. When a thermoplastic resin is used, after the resin heated until liquefaction is poured, the cylindrical tube is cooled to solidify the resin and molded.
In the above molding process, “the fiber reinforcement is covered with the bag film on the cylindrical tube in an airtight manner, and the decompression line for reducing the pressure in the bag film to a vacuum state and the injection line for injecting the resin into the bag film are connected, For molding in which a fluid resin is sucked and injected into a bag film under reduced pressure to solidify the resin, this is also referred to as infusion molding.

  Hereinafter, the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to these drawings.

As shown in FIG. 1, two cylindrical tubes whose ends are cut at approximately 45 degrees are used, but these cut surfaces are butted, and an adhesive is applied and fixed to the cut surfaces. The outer surface of the cylinder is covered with a fiber reinforcing material, subjected to infusion molding, once formed into a right-angled cylindrical tube shown in FIG. 2, and the top part of the cheese shown in FIG. 3 is cut at about 45 degrees. By butting another cylinder tube cut at approximately 45 degrees at right angles to make a cheese shape, the cylindrical outer surface of the butt portion and its peripheral part is covered with a fiber reinforcing material, and subjected to infusion molding The desired fiber reinforced resin cheese shown in FIG. 4 is formed.
As shown in FIG. 5, the fiber reinforcing material 2 is preferably a sheet-like material having one end bonded to the cylindrical tube 1 or a binder wound around the cylindrical tube 1 and arranged and laminated in a substantially windmill shape. The predetermined cuts are laminated so as to have a predetermined thickness. At that time, if the length in the circumferential direction of each sheet is too short, the number of sheets increases and the workability deteriorates. If it is too long, the effect of eliminating wrinkles is lost. About 1/2 is desirable. This sheet-like material is attached or glued only at one end, and a required number of sheets are attached with a shift for each required length. Next, the sheet-like material is wound around the cylindrical tube 1 or the binder wound around the cylindrical tube 1 from the outside of the laminated sheet-like material by the stretchable material (stretchable nonwoven fabric) 3. A release cloth is wound from above, a resin diffusion medium is wound around the center of the molding portion, vacuum suction ports are provided at both ends, and the outside is covered with a vacuum film via a sealing material.
A vacuum suction port is attached to the vacuum pump and the pressure inside is gradually reduced. At that time, the sheet-like material is compressed, but the wrinkles to be generated can be released to the other end side that is not bonded or glued. After reaching a predetermined vacuum pressure and confirming that there are no wrinkles, a resin injection tube is inserted into the interior and placed in contact with the resin diffusion medium, and the resin is injected. If a thermosetting resin is used as the resin, heat is applied, or if a curing agent is added to the resin, the resin is then cured and a predetermined shape can be formed. When a thermoplastic resin is used, the resin heated until it is liquefied is poured and then cooled and solidified for molding.
Specifically, for example, when the diameter of the cylindrical tube 1 is 500 mm, the required number of laminated layers is 10, and the length of the fiber reinforcing material is 1/4 of the circumferential length, the circumferential length of the 45-degree cut portion is approximately 1885 [substantially 3.141 × (500 + 700) / 2], fiber reinforcement length = 1888/5 / 4≈472, fiber reinforcement end face displacement (pitch) = 472/10 = 47.2, and fiber reinforcement with a length of 472 mm The material is pasted by shifting by 47.2 mm, and 10 × 4 = 40 sheets are pasted all around.
In addition, as a method of laminating in a substantially windmill shape, if fiber reinforcing materials of the same width cut to a predetermined length are laminated while being shifted in the circumferential direction, a step corresponding to the thickness can be formed at both ends of the cylindrical tube and the laminated portion. In the case of a high-pressure cylindrical tube, there is a concern about stress concentration.
As a method of avoiding this, as shown in FIG. 6, when fiber reinforcing materials having different widths are sequentially laminated, or fiber reinforcing materials having the same width are sequentially laminated while being shifted in the width direction, the end portions in the width direction become gentle. Thickness and stress concentration is avoided.
For example, a fiber reinforcing material having a width of 300 mm and a length of 500 mm is laminated by sequentially shifting 5 sheets to the left every 10 mm, further laminating by shifting 10 sheets every 10 mm to the right, and laminating by shifting by 10 mm to the left. When laminated to a thickness, the total width is 400 mm, and the left and right 50 mm widths are gradually reduced in thickness, resulting in gentle ends.
Further, as practiced by a conventional hand lay-up molding method or the like, it is also effective in infusion molding to laminate fiber reinforcing materials having different widths sequentially.

  The method of the present invention is to produce a fiber reinforced resin cheese having no trouble of vaporization and scattering of solvent, styrene, etc. in the resin, improved working environment, no generation of wrinkles, good appearance and strength. It is very useful in industry.

1 Cylindrical tube 2 Fiber reinforcing material 3 Stretch material

Claims (5)

  After the cut surfaces are butted and fixed so that the cylindrical tubes whose ends are cut at approximately 45 degrees are arranged at approximately 90 degrees with each other, the outer peripheral portion of the butted portion and the outer cylindrical surface of the peripheral portion are connected to the fiber reinforcing material. The bag reinforcement film is covered with a bag film in an airtight manner, and the bag film is connected to a decompression line for reducing the pressure inside the bag film to a vacuum state and an injection line for injecting resin into the bag film. A flowable resin is sucked and injected into the tube under reduced pressure, and the resin is solidified to form a right-angled cylindrical tube, and then the top of the cylindrical tube is cut to approximately 45 degrees in the same size as the raw material cylindrical tube. The other end of the tube is cut at approximately 45 degrees, and another cylindrical tube of the same size as the above-mentioned raw material cylindrical tube is formed into a cheese shape with a right angle at the cut surface, and the joint and its peripheral portion Cylindrical outer surface Cover the fiber reinforcement with a bag film and airtightly cover the cylindrical tube with a bag film, and connect a decompression line that depressurizes the bag film to a vacuum state and an injection line that injects resin into the bag film. A method for forming a fiber-reinforced resin cheese, wherein a fluid resin is sucked and injected into a bag film under reduced pressure to solidify the resin.   The method for forming a fiber-reinforced resin cheese according to claim 1, wherein the covering is performed by winding.   The winding is characterized in that a large number of fiber reinforcing materials cut to a predetermined length are laminated in a substantially windmill shape by adhering only one end face while shifting their positions in the circumferential direction. 2. A method for molding a fiber-reinforced resin cheese according to 2.   The method for forming a fiber-reinforced resin cheese according to claim 3, wherein the winding is performed by shifting the fiber reinforcing material in the width direction so that both end faces are made gentle.   4. The method for forming a fiber-reinforced resin cheese according to claim 3, wherein fiber reinforcing materials having slightly different widths are sequentially laminated to make both end faces smooth.

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