JP2018001459A - Fiber-reinforced resin molding of branch pipe, and method for producing fiber-reinforced resin molding of branch pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fiber-reinforced resin molding of a branch pipe suppressed in the generation of wrinkles and more highly strengthened, and a method for producing the same.SOLUTION: Provided is a fiber-reinforced resin molding 400 of a branch pipe comprising: an infusion molding die 100 including a branch pipe 110 made of a resin and a resin-impregnated rigid body 120 provided at a surface 112 of the branch pipe 110 made of a resin; a reinforcing fiber 300 layer provided at the surface of the molding die 100; and a resin integrally impregnated into the resin-impregnated rigid body 120 and the reinforcing fiber 300 layer so as to be cured.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a fiber reinforced resin molded article for a branch pipe and a method for producing a fiber reinforced resin molded article for a branch pipe.

  Fiber-reinforced resin molded products are used in various industrial fields because they are lightweight and have high strength. Recently, attention has been focused on an infusion molding method excellent in environmental considerations as a method for producing a fiber-reinforced resin molded product.

  For example, Japanese Unexamined Patent Application Publication No. 2009-255472 (Patent Document 1) discloses an infusion molding that can be performed easily and accurately and can be commercialized without performing end processing of the obtained molded product. It describes a mold and a method for producing a cylindrical fiber-reinforced resin molded article using the mold.

  A mold for infusion molding described in Patent Document 1 includes a cylindrical or columnar body mold having a mold body portion whose outer peripheral surface is a mold surface, and an axial end of the mold body portion of the body mold. And two end surface molds that are sized to protrude from the periphery of the mold main body portion in a state of being attached to the end surface of the mold main body portion, and are formed of reinforcing fibers along the mold surface of the main body mold. In the state where the reinforced fiber layer is provided, the periphery of the reinforced fiber layer and the outer peripheral surface of both end face types are covered with an airtight film, the reinforced fiber layer is held in the airtight space, and then the inside of the airtight space is decompressed. In addition, a mold for infusion molding in which a matrix resin is supplied into the airtight space in a reduced pressure state so that the reinforcing fiber layer is impregnated with the matrix resin. Have the above ridges Both end face molds are provided with a resin injection port for supplying a matrix resin supplied from the outside of the mold to the reinforcing fiber layer through a resin flow path provided inside the end face mold, and the other end face mold is provided with an end face mold. An intake port is provided for sucking and exhausting air in the airtight space to the outside of the mold through an intake passage provided inside.

  Japanese Patent Application Laid-Open No. 2011-79283 (Patent Document 2) discloses a method for joining cylindrical members that are free from wrinkles, have good appearance, and retain strength, and a method for forming a cylindrical molded body. Yes.

  In the method for forming a cylindrical molded body of a cylindrical member described in Patent Document 2, the outer peripheral surface of the cylindrical members is formed along the outer peripheral surface of the joining portion of the end surfaces of the substantially cylindrical members that are in contact with each other. A step of arranging the reinforcing fiber base material with a bag film and sealing the outer peripheral surface with the bag film, and reducing the pressure between the outer peripheral surface and the sealing material, and sucking and injecting the fluid resin. And a step of curing or solidifying the injected resin, and the reinforcing fiber base material is disposed while being displaced in the circumferential direction and the lateral direction along the outer peripheral surface of the joint portion. One end in the circumferential direction is bonded, and the other end in the circumferential direction is arranged so as to overlap the outer surface of another adjacent sheet-like object, and is laminated along the circumferential direction of the joint portion. It is characterized by that.

JP 2009-255472 A JP 2011-79283 A

  The branch pipe has a more complicated surface shape than the straight pipe and the curved pipe. Moreover, since the generated stress is larger than the straight pipe, the branch pipe needs to be strengthened to a higher degree in order to properly reinforce it. For this reason, when it is going to reinforce a branch pipe appropriately by the method of patent document 1 and patent document 2, a wrinkle and / or a resin non-impregnation part will arise in a fiber reinforced resin molded product.

  Specifically, since the shape of the branch pipe is complicated, wrinkles are likely to occur in a fiber-reinforced resin molded product by infusion molding. In addition, it is necessary to increase the thickness or the number of layers of the reinforcing fiber base material from the necessity of highly reinforcing, or from the necessity of appropriately covering the root portion of the branch pipe having a complicated shape, the reinforcing fiber at the root portion. By increasing the number of layers of the base material, the wrinkled part becomes relatively thicker than the non-wrinkled part, and the resin is impregnated inside by being compressed by the vacuum pressure during infusion molding. Disappear. When such a resin non-impregnated part arises, a problem will arise in the intensity | strength of a fiber reinforced resin molding.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a fiber reinforced resin molded article of a branch pipe that is more highly reinforced and the production method thereof.

The present invention includes the following inventions.
(1)
The fiber reinforced resin molded product of the branch pipe of the present invention includes an infusion mold including a resin branch pipe and a resin-impregnated rigid body provided on the surface of the resin branch pipe; and provided on the surface of the mold. And a resin impregnated rigid body and a resin integrally impregnated and cured in the reinforcing fiber layer.

  The resin-impregnated rigid body has an internal space that communicates with the outside, and has such a rigidity that the cross-sectional shape is not flattened by a vacuum pressure (for example, 40 KPa) during infusion molding.

  Thus, wrinkles of the reinforcing fiber layer provided on the outer side of the resin-impregnated rigid body are suppressed by the resin-impregnated rigid body raising the surface of the infusion mold.

  Further, the generation of wrinkles is suppressed by the resin-impregnated rigid body and the resin is impregnated inside the resin-impregnated rigid body, so that the thickness or the number of laminated reinforcing fiber layers is increased. In addition, the occurrence of a portion in which the resin is not impregnated is also prevented. Therefore, the fiber reinforced resin molded product of the branch pipe is highly reinforced.

  Furthermore, the impregnated resin in the reinforcing fiber layer and the impregnated resin in the resin-impregnated rigid body are integrally cured, so that the fiber reinforced resin molded product of the branch pipe is further reinforced.

(2)
In the fiber reinforced resin molded product of the branch pipe of (1) above, the resin-impregnated rigid body has a spiral tube, a spring, a spiral tube in which fibers are included, a spring in which fibers are included, and a radiation centering on a core material. It may be selected from the group consisting of brushes with fibers in the direction.

  Accordingly, since the resin impregnation property and the rigidity are well combined, the reinforcing property and the wrinkle suppression property are further improved.

(3)
In the fiber reinforced resin molded product of the branch pipe (1) or (2), the resin-impregnated rigid body may be provided in the circumferential direction at the branch portion of the resin branch pipe.

  As a result, the effect of suppressing wrinkles with respect to the complicatedly shaped branch pipe can be obtained more easily.

(4)
In the fiber reinforced resin molded product of the branch pipe (1) or (2), a resin-impregnated rigid body may be provided in the axial direction of the resin branch pipe.

  Thereby, the wrinkle suppression effect in the axial direction of the branch pipe becomes better.

(5)
The method for producing a fiber reinforced resin molded article of a branch pipe of the present invention includes a coating step, a pressure reduction step, and a resin impregnation step.
In the covering step, an infusion mold including a resin branch pipe and a resin-impregnated rigid body provided on the surface of the resin branch pipe is covered with a reinforcing fiber layer.
In the decompression step, the infusion mold covered with the reinforcing fiber layer is covered with an airtight film, and the inside of the airtight film is decompressed.
In the resin impregnation step, the resin resin-impregnated rigid body and the reinforcing fiber layer are impregnated with a matrix resin.

  The resin-impregnated rigid body has an internal space that communicates with the outside, and has such a rigidity that the cross-sectional shape is not flattened by a vacuum pressure (for example, 40 KPa) during infusion molding.

  In this way, the resin-impregnated rigid body swells the surface of the infusion molding die, so that the reinforcing fiber layer provided outside the resin-impregnated rigid body is reinforced when compressed by the vacuum pressure during infusion molding. The wrinkles of the fiber layer can be made difficult to occur.

  Further, by suppressing the generation of wrinkles with the resin-impregnated rigid body and impregnating the resin inside the resin-impregnated rigid body, even if the thickness of the coated reinforcing fiber layer or the number of laminated layers is increased, the resin is not Generation | occurrence | production of the part used as an impregnation can be prevented. Therefore, the branch pipe can be strengthened to a higher degree.

  Further, the resin is impregnated into the resin-impregnated rigid body together with the reinforcing fiber layer by the vacuum pressure at the time of infusion molding, and the resin impregnated into the fiber-reinforced layer and the resin impregnated rigid body at the time of curing. Are integrally cured. Thus, since the fiber reinforced layer and the resin-impregnated rigid body are integrated after curing, the branch pipe can be further strengthened.

(6)
The manufacturing method of the fiber reinforced resin molded product of the branch pipe of (5) described above is that the resin-impregnated rigid body is mainly composed of a spiral tube, a spring, a spiral tube containing fibers, a spring containing fibers, and a core material. It may be selected from the group consisting of brushes having fibers in the radial direction.

  Accordingly, since the resin impregnation property and the rigidity are well combined, the reinforcing property and the wrinkle suppression property are further improved.

(7)
In the method for producing a fiber-reinforced resin molded article of the branch pipe according to (5) or (6), the resin-impregnated rigid body may be provided in the circumferential direction at the branch portion of the resin branch pipe.

  As a result, the effect of suppressing wrinkles with respect to the complicatedly shaped branch pipe can be obtained more easily.

(8)
In the method for manufacturing a fiber reinforced resin molded article of the branch pipe according to (5) or (6), the resin-impregnated rigid body may be provided in the axial direction of the resin branch pipe.

  Thereby, the wrinkle suppression effect in the axial direction of the branch pipe becomes better.

  According to the present invention, it is possible to provide a fiber reinforced resin molded product of a branch pipe that is suppressed from generation of wrinkles due to infusion molding and that is more highly reinforced, and a manufacturing method thereof.

It is a typical external view which shows an example of the infusion shaping | molding die in 1st Embodiment. It is typical sectional drawing of the square enclosure part of FIG. It is a typical external view for demonstrating the coating process using the infusion shaping | molding die of FIG. FIG. 4 is a partial cross-sectional view of FIG. 3. It is a typical external view for demonstrating the pressure reduction process and resin impregnation process using the infusion shaping | molding die of FIG. FIG. 6 is a partial cross-sectional view of FIG. 5. It is typical sectional drawing which shows the fiber reinforced resin molded product using the infusion mold of FIG. It is a typical external view which shows an example of the infusion shaping | molding die in 2nd Embodiment. It is the IX-IX sectional view taken on the line of FIG. It is sectional drawing for demonstrating the coating | coated process using the infusion shaping | molding die of FIG. It is sectional drawing for demonstrating the pressure reduction process and resin impregnation process using the infusion shaping | molding die of FIG. It is sectional drawing which shows the fiber reinforced resin molded product using the infusion mold of FIG. The 1st modification of a resin impregnation rigid body is shown. The 2nd modification of a resin impregnation rigid body is shown. The 3rd modification of a resin impregnation rigid body is shown. The 4th modification of a resin impregnation rigid body is shown.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Moreover, in the case of the same code | symbol, those names and functions are also the same. Therefore, detailed description thereof will not be repeated basically.

[1. First Embodiment]
[1-1. Infusion mold]
FIG. 1 is a schematic external view showing an example of an infusion mold prepared in the covering step in the first embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of the boxed portion of FIG.

  As shown in FIG. 1, the infusion mold 100 includes a resin branch pipe 110 and a resin-impregnated rigid body 120. In addition, a guide pipe 130 and spiral tubes 140 and 150 may be attached to the infusion mold 100.

[1-1-1. Plastic branch pipe]
The resin branch pipe 110 of the present embodiment is a cheese manufactured by cutting a resin straight pipe and using a butt fusion machine. The diameter (outer diameter) of the resin branch pipe 110 is, for example, 100 mm or more. Further, in the present invention, the diameter of the resin branch pipe 110 (the smaller diameter when the main pipe and the branch pipe are different) is a large diameter of 250 mm or more, preferably 500 mm or more, which requires a higher degree of reinforcement. Is particularly useful. The upper limit within the range of the aperture is not particularly limited, and may be practically 1200 mm, for example.

  The material of the resin branch pipe 110 is not particularly limited as long as it is a resin, and may be a thermoplastic resin such as polyolefin (polyethylene, polypropylene, etc.) and polyvinyl chloride.

  The resin branch pipe 110 includes a plurality (two in this embodiment) of straight pipe portions 115 and a connecting portion 117 that is other portions (portions where the plurality of straight pipe portions 115 are joined). In this specification, the periphery of the boundary between the straight pipe portion 115 and the connecting portion 117 is referred to as a branch portion 116.

[1-1-2. Resin impregnated rigid body]
A resin-impregnated rigid body 120 is provided on the outer surface 112 of the resin branch pipe 110. In the present embodiment, the resin-impregnated rigid body 120 is provided so as to be wound once in the circumferential direction of each of the main pipe and the branch pipe of the resin branch pipe 110. Further, the resin-impregnated rigid body 120 is provided at the branch portion 116 of the resin branch pipe 110. The resin-impregnated rigid body 120 may be fixed to the outer surface 112 of the resin branch pipe 110 with an adhesive. Thereby, the surface of the branch part 116 of the resin branch pipe 110 is raised among the surfaces of the infusion mold 100 to be covered with the reinforcing fiber layer described later. Therefore, wrinkles can be prevented from occurring even in the branch portion 116 that is particularly complicated in shape and tends to gather wrinkles.

  The resin-impregnated rigid body 120 in the present embodiment includes a spiral tube 121 and fibers 122 accommodated therein.

The spiral tube 121 constituting the resin-impregnated rigid body 120 has a cross-section (specifically, a cross-section when cut along a plane perpendicular to the direction of the helical axis, which is the longitudinal direction), under a vacuum pressure imposed in a decompression step described later. Has a rigidity that does not flatten the shape. The vacuum pressure that the spiral tube 121 can withstand, for example, may be 40 KPa.
Furthermore, since it has a spiral body and has a space in which the outside and the interior communicate continuously in the direction of the spiral axis and the circumferential direction of the spiral axis, the space is secured as a resin flow path in the resin impregnation step described later, and the matrix resin Is easy to impregnate inside.

  The material of the spiral tube 121 may be either resin or metal, but is preferably resin such as polyethylene, polypropylene, polyvinyl chloride, polyamide, nylon.

  Although it will not specifically limit if it is a form accommodated in the inside of the spiral tube 121 as the fiber 122, For example, the fiber direction may follow the longitudinal direction of the resin impregnation rigid body 120, for example, may be roving. Although glass fiber can be used as the fiber 122, the material of the fiber is not particularly limited. For example, metal fibers and other inorganic fibers; carbon fibers, aramid fibers, polyvinyl alcohol fibers, vinyl chloride fibers, acrylic fibers, polyester fibers, polyurethane fibers, polyethylene fibers, polypropylene fibers, polystyrene fibers, and acetate fibers and other organic synthetic fibers; It may be selected from hemp and bamboo and other natural fibers; and rayon and other regenerated fibers. The fiber mentioned above may be used independently and may be used in combination of multiple types.

[1-1-3. Others]
A guide pipe 130 is attached to the open end 111 of the resin branch pipe 110. The outer periphery of the guide pipe 130 is formed to be substantially the same as or slightly larger than the inner periphery of the opening end 111 of the resin branch pipe 110, and one end of the guide pipe 130 is inserted into the opening end 111 so as to be coaxial. . A portion of the outer peripheral surface of the guide pipe 130 exposed outside the opening end 111 is provided by winding the spiral tube 140 as an intake pipe once.

  In addition, although the spiral tube 140 was shown as a specific example of an intake pipe, an intake pipe is not restricted to such an aspect. For example, a ring-shaped hollow member that can be mounted on the outer peripheral surface of the guide pipe 130 and that has a hole for communicating the hollow interior and the exterior may be used.

[1-2. Coating process]
FIG. 3 is a schematic external view for explaining the covering step in the first embodiment of the present invention. 4 is a partial cross-sectional view of FIG. 3 (corresponding to FIG. 2).

  In this step, a layer of reinforcing fibers 300 (see FIG. 4) is formed on the outer periphery of the infusion mold 100.

[1-2-1. Reinforcing fiber]
The reinforcing fiber 300 is preferably glass fiber, but is not limited thereto. For example, metal fibers and other inorganic fibers; carbon fibers, aramid fibers, polyvinyl alcohol fibers, vinyl chloride fibers, acrylic fibers, polyester fibers, polyurethane fibers, polyethylene fibers, polypropylene fibers, polystyrene fibers, and acetate fibers and other organic synthetic fibers; It may be selected from hemp and bamboo and other natural fibers; and rayon and other regenerated fibers. In particular, glass fiber, carbon fiber, and aramid fiber are exemplified. Moreover, the reinforcing fiber mentioned above may be used independently, and multiple types may be used in combination.

  The reinforcing fiber 300 may be a woven fabric, a non-woven fabric, a mixed paper, or the like, and may have a form in which the above-described fiber is in the form of a thread, a mat, a cloth, a tape, or a sheet.

[1-2-2. Formation of reinforcing fiber layer]
The method for forming the layer of the reinforcing fibers 300 is not particularly limited and can be appropriately selected by those skilled in the art.
For example, the layer of the reinforcing fiber 300 may be formed by being divided into the straight pipe portion 115 and the connecting portion 117 of the resin branch pipe 110.

  The straight pipe portion 115 can be formed by using one or a plurality of reinforcing fibers 300 having the above-described outer circumferential length and winding them to a predetermined layer thickness. Alternatively, a plurality of pieces of reinforcing fibers 300 having the length shorter than the length of the outer periphery of the straight pipe part 115 are used, and the whole straight pipe part 115 is covered while each part is overlapped with each other and shifted in the circumferential direction. And it can also form by sticking until it becomes a predetermined layer thickness.

  The connecting portion 117 uses a plurality of small pieces of the reinforcing fiber 300 of the above-described aspect, and covers the entire connecting portion 117 and pastes it until a predetermined layer thickness is achieved while overlapping each other and shifting in an arbitrary direction. Can be formed. Alternatively, the connecting portion 117 is sandwiched between the front side and the back side of the reinforcing fiber 300 having a size capable of covering the front half and the back half as viewed from the illustrated direction of the connecting portion 117. It can also be formed by coating.

  The layer of the reinforcing fiber 300 formed by the straight pipe part 115 and the layer of the reinforcing fiber 300 formed by the connecting part 117 may be provided so as to overlap with each other at the branch part 116.

[1-2-3. Reinforcing fiber layer]
The thickness of the layer of the reinforcing fibers 300 may be, for example, 10 mm or more, preferably 15 mm or more. Thereby, the resin branch pipe 110 can be highly strengthened. Although the upper limit in the said range is not specifically limited, From a viewpoint of ensuring the resin impregnation property with respect to the whole thickness of the reinforcing fiber 300 favorably, it may be 30 mm, for example.

  Or the lamination | stacking number of the reinforcement fiber in the layer of the reinforcement fiber 300 may be 17 times or more, for example, Preferably it is 25 times or more. Thereby, the resin branch pipe 110 can be highly strengthened. Although the upper limit in the said range is not specifically limited, From a viewpoint of ensuring the resin impregnation property with respect to the whole layer thickness of the reinforced fiber 300 favorable, it may be 50 times, for example.

  As shown in FIG. 4, the inner surface of the layer of reinforcing fibers 300 contacts a part of the outer peripheral surface of the infusion mold 100. Since a part of the layer of the reinforcing fiber 300 is lifted by the resin-impregnated rigid body 120, at this time, the inner surface of the layer of the infusion mold 100 and the reinforcing fiber 300 in the vicinity of the resin-impregnated rigid body 120 There is a gap S between the two.

[1-2-4. Others]
A layer of release cloth 310 is formed on the surface of the layer of reinforcing fibers 300. Specifically, the release cloth 310 may be a silicone-coated nylon cloth having fine holes through which resin is passed and excellent in releasability from the matrix resin. On the surface of the release cloth 310 layer, a resin diffusion material 311 layer is formed. Specifically, the resin diffusion material 311 may be a net-like sheet material. As shown in FIG. 3, the layer of the resin diffusion material 311 is formed on a part of the surface of the layer of the release cloth 310. Specifically, the layer of the resin diffusing material 311 is formed so as to avoid the position where the resin-impregnated rigid body 120 is disposed and the periphery thereof on the surface of the layer of the release cloth 310. Thereby, the matrix resin impregnation in the thickness direction of the reinforcing fiber 300 is promoted.

  The spiral tube 140 as an intake pipe is provided with an intake tube 141 for guiding intake air from the spiral tube 140 as an intake pipe in the axial direction of the resin branch pipe 110. Specifically, a T-type tube connector 142 is attached to a spiral tube 140 serving as an intake pipe, and an intake tube 141 is connected to the T-type tube connector 142. In this case, the intake tube 141 is disposed in contact with the outer peripheral surface of the guide pipe 130. The intake tube 141 is connected to an intake pipe 144 connected to the vacuum pump 143. A drain tank 145 is interposed in the intake pipe 144.

  On the other hand, a connecting portion 117 of the resin branch pipe 110 is provided with a resin injection tube 151 for injecting resin. The resin injection tube 151 is connected to a resin supply pipe 154 connected to a matrix resin supply tank 153.

  A seal member 131 is provided on the outer peripheral surface of each guide pipe 130 outside the position where the spiral tube 140 serving as an intake pipe is disposed. The sealing material 131 is wound in a tubular shape so that the guide pipe 130 and the intake tube 141 disposed on the outer peripheral surface of the guide pipe 130 are bundled at a time. In this case, the boundary between the outer peripheral surface of the guide pipe 130 and the outer peripheral surface of the intake tube 141 is filled with the sealing material 131. Further, a sealing material 131 is also provided around the resin injection tube 151. The sealing material 131 may be an indeterminate material such as butyl rubber or putty.

  Further, the periphery of the infusion mold 100 in which the reinforcing fiber 300 layer, the release cloth 310 layer, and the resin diffusing material 311 layer are laminated is sealed with an airtight film 132. In this case, an airtight film 132 is disposed so as to cover the sealing material 131. The airtight film 132 is not particularly limited as long as an airtight state can be secured, and examples thereof include a film made of a resin such as polyethylene, polypropylene, polyvinyl chloride, polyamide, and nylon resin.

[1-3. Pressure reduction process and resin impregnation process]
FIG. 5 is a schematic external view for explaining a pressure reduction process and a resin impregnation process in the first embodiment of the present invention. 6 is a partial cross-sectional view of FIG. 5 (corresponding to FIG. 2).

[1-3-1. Pressure reduction process]
As shown in FIG. 5, the vacuum pump 143 is driven to exhaust the air in the airtight film 132 from the intake tube 141 in the direction of the arrow EX. Thereby, the inside of the airtight film 132 is depressurized, and the airtight film 132 contracts in a direction from the surface toward the axis of the resin branch pipe 110. Accordingly, the lamination of the reinforcing fiber 300, the release cloth 310, and the resin diffusion material 311 is also subjected to a load in the thickness direction. Further, the air in the gap S (see FIG. 4) that existed between the inner side surface of the reinforcing fiber 300 layer and the outer peripheral surface of the infusion mold 100 is also discharged out of the airtight film 132.

  Thereby, as shown in FIG. 6, the layer of the reinforcing fiber 300 is mainly compressed, and the laminate of the reinforcing fiber 300, the release cloth 310 and the resin diffusion material 311 is along the outer peripheral surface of the infusion mold 100. Stick. Specifically, the inner surface of the layer of the reinforcing fiber 300 is deformed so as to be along the surface of the resin-impregnated rigid body 120 and the outer surface 112 of the resin branch pipe 110, and is in close contact with more surfaces than in the coating step. . As a result, wrinkles of the reinforcing fiber 300 can be made difficult to occur.

[1-3-2. Resin impregnation process]
When the inside of the airtight film 132 is under such a reduced pressure, the matrix resin passes from the resin supply tank 153 through the resin supply pipe 154 and the resin injection tube 151 (in the direction of the arrow IN) and into the layers of the reinforcing fibers 300. The resin enters the resin-impregnated rigid body 120 (in this embodiment, the fibers 122 accommodated in the resin-impregnated rigid body 120). As a result, the matrix resin is integrally impregnated into the reinforcing fibers 300 and the resin-impregnated rigid body 120 (in this embodiment, the fibers 122 accommodated in the resin-impregnated rigid body 120).

  In this case, since the resin-impregnated rigid body 120 is not flattened under reduced pressure due to its rigidity, the effect of preventing the occurrence of wrinkles by maintaining the shape of the resin-impregnated rigid body 120 can be favorably maintained. In addition, the resin-impregnated rigid body 120 does not flatten under reduced pressure due to its rigidity, even if the thickness of the portion to be impregnated with the matrix resin is relatively thick, It is also effective in that it is easily impregnated. In this embodiment, the fibers 122 are accommodated inside the resin-impregnated rigid body 120, but the fibers 122 are not compressed because the spiral tube 121 is not flattened even under reduced pressure. For this reason, the matrix resin is easily impregnated into the fibers 122. Therefore, generation | occurrence | production of the unimpregnated part can be suppressed.

  In the process in which the matrix resin is guided in the exhaust direction (the direction of the arrow EX), in the portion where the resin diffusion material 311 is provided, the matrix resin travels along the resin diffusion material 311, so The resin is evenly distributed and efficiently transported to the intake side, and is also impregnated in the thickness direction of the laminate. In the portion where the resin diffusing material 311 is not provided, the matrix resin transported in a uniformly distributed state is not affected by induction in the direction along the outer periphery by the resin diffusing material 311. It proceeds in the exhaust direction while impregnating more efficiently.

  After the matrix resin is completely impregnated into the layer of the reinforcing fibers 300 and the resin-impregnated rigid body 120, the driving of the vacuum pump 143 can be stopped before the impregnated matrix resin is completely cured.

  The matrix resin is not particularly limited, and examples thereof include thermosetting resins such as unsaturated polyester resins, acrylic resins, vinyl ester resins, alkyd resins, amino resins, epoxy resins, urethane resins, phenol resins, and silicone resins. . The matrix resin includes polyethylene resin, polypropylene resin, polystyrene resin, polybutadiene resin, styrene butadiene resin, polyacetal resin, polyamide resin, polycarbonate resin, polyphenylene ether resin, polyethylene terephthalate resin, polybutylene terephthalate resin, polyarylate resin, polystyrene. Examples thereof include thermoplastic resins such as resins, polyethersulfone resins, polyimide resins, polyamideimide resins, polyphenylene sulfide resins, polyoxybenzoyl resins, polyetheretherketone resins, polyetherimide resins, and cellulose acetate resins.

The matrix resin preferably has a viscosity of 0.2 Pa · s or less in order to promote the impregnation of the reinforcing fiber 300 into the layer. Accordingly, the matrix resin can easily be impregnated into the layer of the reinforcing fibers 300, and the time required for the impregnation process can be prevented from being increased, thereby improving productivity and preventing impregnation failure.
From this point of view, when the matrix resin is a thermoplastic resin, the state of the resin at the time of supply may be that in which the viscosity is lowered by heating in advance to a molten state.
In addition, an additive selected from an antioxidant, a flame retardant, a heat stabilizer, an ultraviolet absorber, a light stabilizer, etc. in consideration of the use of a pigment for coloring and / or durability after molding in the matrix resin You may mix | blend material suitably.

[1-3-3. Curing]
When the matrix resin integrally impregnated into the reinforcing fiber 300 and the resin-impregnated rigid body 120 is completely cured or semi-cured (for example, if the cured resin is completely cured, 24 hours after completion of the matrix resin impregnation), the release cloth 310 And the resin diffusion material 311 is removed and the fiber reinforced resin molded product 400 shown in FIG. 7 is obtained. In this specification, both curing by a curing reaction when the matrix resin is a thermosetting resin and curing (solidification) by cooling when the matrix resin is a thermoplastic resin are collectively described as curing.

[1-3-4. Modified example]
In the present embodiment, the resin injection tube 151 is provided only at one location farthest from the opening end 111 of the branch pipe of the connecting portion 117 of the resin branch pipe 110, but the present invention is not limited to this mode. . For example, in place of or in addition to the location, the resin injection tube 151 may be disposed at a location shifted in the circumferential direction from the location, for example, at 2 to 4 locations. As a result, the increase in the amount of matrix resin injected per unit time and / or the adjustment of the injection location of the matrix resin can be achieved.

  Furthermore, in this embodiment, it is configured such that the exhaust gas is exhausted from the opening 111 of the resin branch pipe 110 and the matrix resin is injected from the connecting portion 117, but this is not a limitation. For example, by replacing the intake pipe 144, the vacuum pump 143 and the drain tank 145 with the resin supply pipe 154 and the supply tank 153, the exhaust location and the matrix resin injection location may be reversed.

[1-4. Fiber reinforced resin molded product]
As shown in FIG. 7, the fiber-reinforced resin molded product 400 includes a resin branch pipe 110 and an infusion mold 100 having a resin-impregnated rigid body 120 provided on the outer surface 112 of the resin branch pipe 110, Including a layer of reinforcing fibers 300 provided on the outer peripheral surface of the infusion mold 100, and the resin impregnated in the layer of reinforcing fibers 300 and the resin impregnated in the resin-impregnated rigid body 120 are integrally formed. It is cured.

  The fiber-reinforced resin molded product 400 is highly reinforced by suppressing the generation of wrinkles in the layer of the reinforcing fiber 300 and the non-impregnation of the matrix resin by the resin-impregnated rigid body 120. Further, the fiber reinforced resin molded product 400 is highly reinforced in that the resin impregnated in the layer of the reinforcing fiber 300 and the resin impregnated in the resin-impregnated rigid body 120 are integrated by curing.

[2. Second Embodiment]
FIG. 8 is a schematic external view showing an example of an infusion mold prepared in the covering step in the second embodiment of the present invention. 9 is a cross-sectional view taken along line IX-IX in FIG.
The second embodiment is the same as the first embodiment except that the arrangement of the resin-impregnated rigid body 120 is different in the infusion mold 100a. A description of the same points as in the first embodiment will be omitted.

  As shown in FIG. 8, in the infusion mold 100a, the resin-impregnated rigid body 120 is disposed along the axial direction of the straight pipe. In the present embodiment, as shown in FIG. 9, in the branch pipe of the resin branch pipe 110, four resin-impregnated rigid bodies 120 are arranged at equal intervals over the entire outer periphery of the branch pipe. In addition, in the main pipe of the resin branch pipe 110, it is arrange | positioned at equal intervals over the outer periphery except the part of a branch pipe.

  In FIG. 10, sectional drawing in the coating process of 2nd Embodiment of this invention is shown. As shown in FIG. 10, the inner surface of the layer of the reinforcing fibers 300 contacts only a part of the outer peripheral surface of the infusion mold 100a. A part of the reinforcing fiber 300 layer is lifted by the resin-impregnated rigid body 120, whereby a gap S is formed between the infusion mold 100a and the inner surface of the reinforcing fiber 300 layer. Thereby, the layer of the reinforcing fiber 300 can be formed so that the inner side surface of the layer of the reinforcing fiber 300 has a larger area than the outer surface 112 of the resin branch pipe 110.

  In FIG. 11, sectional drawing in the pressure reduction process and resin impregnation process of this embodiment is shown. As shown in FIG. 11, the layers of the reinforcing fibers 300 are mainly compressed, and the laminated layers of the reinforcing fibers 300, the release cloth 310, and the resin diffusion material 311 stick along the outer peripheral surface of the infusion mold 100a. In the infusion mold 100a, if the conventional method does not use the resin-impregnated rigid body 120, the reinforcing fiber layer of the surplus portion that has been generated as wrinkles without being in close contact with the infusion mold at the time of decompression is the infusion mold 100a. The outer surface of the resin-impregnated rigid body 120 that swells the outer surface can be brought into close contact with the outer surface. Thereby, wrinkles of the reinforcing fiber 300 can be made difficult to occur.

  As a result, a fiber reinforced resin molded product 400a shown in FIG. 12 is obtained. The fiber reinforced resin molded product 400a includes a resin branch pipe 110 and an infusion mold 100a having a resin-impregnated rigid body 120 provided on the outer surface 112 of the resin branch pipe 110, and an outer periphery of the infusion mold 100a. The resin impregnated in the reinforcing fiber 300 layer and the resin impregnated in the resin-impregnated rigid body 120 are integrally cured, including the reinforcing fiber 300 layer provided on the surface.

[3. Modified example]
FIG. 13 to FIG. 16 show modified examples of the resin-impregnated rigid body. These modifications may be applied to any of the above-described embodiments.

  A resin-impregnated rigid body 120c shown in FIG. 13 is configured by a spiral tube 121 and is different from the resin-impregnated rigid body 120 described above in that the fibers 122 are not included. Considering the strength after curing, it is preferable that the fibers 122 are encapsulated like the resin-impregnated rigid body 120, but the resin-impregnated rigid body 120c impregnates the matrix resin inside even if the fibers 122 are not encapsulated. As with the resin-impregnated rigid body 120, it can be integrated with the matrix resin impregnated in the reinforcing fiber 300 layer by curing.

  A resin-impregnated rigid body 120d shown in FIG. 14 includes a spring 121d. The spring 121d in the present embodiment is a linear helical body in which a space is continuously secured between the outside and the inside continuously in the helical axis direction and the circumferential direction of the helical axis as in the shape of a compression spring. . Therefore, it is excellent in impregnation like the spiral tube 121 described above. Furthermore, the spring 121d has the same rigidity as the spiral tube 121.

  A resin-impregnated rigid body 120e shown in FIG. 15 includes fibers 122 similar to those of the resin-impregnated rigid body 120 described above inside a spring 121d similar to the resin-impregnated rigid body 120d described above. The inclusion of the fiber 122 is preferable in that the fiber 122 is highly reinforced compared to the case where the above-described resin-impregnated rigid body 120d is used.

  A resin-impregnated rigid body 120f shown in FIG. 16 is a brush composed of a core material 123f and fibers 122f provided in a radial direction centering on the core material 123f. In FIG. 16, a part of the fiber 122f is cut away. Since the fibers 122f are provided in the radial direction, the resin-impregnated rigid body 120f as a whole has the same rigidity as the resin-impregnated rigid body 120 described above, and is excellent in resin impregnation into the fibers 122f. .

[Correspondence Relationship Between Each Part in Embodiment and Modification and Each Component in Claim]
In the present invention, the infusion molds 100 and 100a in the specification correspond to the “infusion mold” in the claims, the resin branch pipe 110 corresponds to the “resin branch pipe”, and the outer surface 112 The resin-impregnated rigid body 120, 120c,..., 120f corresponds to the “resin-impregnated rigid body”, the spiral tube 121 corresponds to the “spiral tube”, and the spring 121d. Corresponds to “spring”, the fibers 122 and 122 f correspond to “fiber”, the core material 123 f corresponds to “core material”, the reinforcing fiber 300 corresponds to “reinforcing fiber”, and the airtight film 132 is “ It corresponds to “airtight film”, and the fiber reinforced resin molded products 400 and 400a correspond to “fiber reinforced resin molded products”.

  Preferred embodiments of the present invention are as described above, but the present invention is not limited to them, and various other embodiments are possible without departing from the spirit of the present invention.

100, 100a Infusion mold 110 Resin branch pipe 112 Outer surface (surface of resin branch pipe)
116 branch
120, 120c, ..., 120f Resin impregnated rigid body 121 Spiral tube 121d Spring 122, 122f Fiber 123f Core material 132 Airtight film 300 Reinforced fiber 400, 400a Fiber reinforced resin molded product

Claims (8)

An infusion mold including a resin branch pipe and a resin-impregnated rigid body provided on the surface of the resin branch pipe;
A reinforcing fiber layer provided on the surface of the mold,
A resin impregnated and cured integrally with the resin-impregnated rigid body and the reinforcing fiber layer;
A fiber reinforced resin molded product for branch pipes.   The resin-impregnated rigid body is selected from the group consisting of a spiral tube, a spring, a spiral tube in which fibers are included, a spring in which fibers are included, and a brush having fibers in a radial direction around a core material. Item 2. A fiber reinforced resin molded product of the branch pipe according to Item 1.   The fiber-reinforced resin molded product of a branch pipe according to claim 1 or 2, wherein the resin-impregnated rigid body is provided in a circumferential direction at a branch portion of the resin branch pipe.   The fiber-reinforced resin molded product of a branch pipe according to claim 1 or 2, wherein the resin-impregnated rigid body is provided in an axial direction of the resin branch pipe. A coating step of covering an infusion mold including a resin branch pipe and a resin-impregnated rigid body provided on the surface of the resin branch pipe with a reinforcing fiber layer;
A depressurizing step of covering the infusion mold covered with the reinforcing fiber layer with an airtight film and depressurizing the inside of the airtight film;
A resin impregnation step of impregnating the resin impregnated rigid body and the reinforcing fiber layer with a matrix resin;
The manufacturing method of the fiber reinforced resin molded product of a branch pipe containing this.   The resin-impregnated rigid body is selected from the group consisting of a spiral tube, a spring, a spiral tube in which fibers are included, a spring in which fibers are included, and a brush having fibers in a radial direction around a core material. Item 6. A method for producing a fiber reinforced resin molded article of a branch pipe according to Item 5.   The method for producing a fiber reinforced resin molded product of a branch pipe according to claim 5 or 6, wherein the resin-impregnated rigid body is provided in a circumferential direction at a branch portion of the resin branch pipe.   The method for producing a fiber reinforced resin molded product of a branch pipe according to claim 5 or 6, wherein the resin-impregnated rigid body is provided in an axial direction of the resin branch pipe.