JP2014148133A - Fiber-reinforced resin molding, production method of fiber-reinforced resin molding, and infusion form block - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fiber-reinforced resin molding that has a satisfactory surface nature while maintaining hardness; an infusion molding method that produces the same; and an infusion form block that is used in the molding method.SOLUTION: An infusion form block includes a shaft body that has at least one of surface expanded parts of a salient and a recess at an outer peripheral surface. A production method of a fiber-reinforced resin molding includes: a laminate process in which a reinforcement fiber layer is laminated to the infusion form block; a decompression process in which the form block to which the reinforcement fiber layer is laminated is covered by an airtight film, and decompression is performed within the airtight film; and an impregnation process in which the reinforcement fiber layer is impregnated by a matrix resin.

Description

  The present invention relates to infusion molding. More specifically, the present invention relates to a fiber reinforced resin molded product, a method for producing the fiber reinforced resin molded product, and an infusion mold used in the method.

  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, Patent Document 1 (Japanese Patent Application Laid-Open No. 2009-255472) discloses an infusion molding that can be performed easily and accurately and can be commercialized without end treatment 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.

  The joining method of the cylindrical member described in Patent Document 2 is a joining method of the cylindrical member that abuts and joins the end faces of the substantially cylindrical members, and the reinforcing fiber base material is joined to the end face of the substantially cylindrical member that abuts. A step of arranging the outer peripheral surface of the cylindrical member across the outer peripheral surface of the joint portion, a step of covering the reinforcing fiber base material with a bag film and sealing the outer peripheral surface, and the outer peripheral surface and the sealing material And the step of sucking and injecting the flowable resin and the step of curing or solidifying the injected resin, the reinforcing fiber base is circumferentially and laterally along the outer peripheral surface of the joint. A plurality of sheet-like objects arranged with their positions shifted in the direction, with one end in the circumferential direction adhered and the other end in the circumferential direction overlapped with the outer surface of another adjacent sheet-like object. Are overlaid along the circumferential direction of the joint .

JP 2009-255472 A JP 2011-79283 A

  The inventions of Patent Literature 1 and Patent Literature 2 have very significant effects as disclosed.

On the other hand, in general, in a fiber reinforced resin molded article using an infusion molding method, wrinkles are generated on the surface of the final product, and good surface properties cannot be obtained. Such a tendency is particularly remarkable when the molded product is a shaft. For this reason, in order to obtain a favorable surface property, it is necessary to perform processing after forming a fiber-reinforced resin molded product.
However, if processing is performed after the fiber-reinforced resin molded product is formed, the reinforcing fiber layer may be damaged, and the strength of the fiber-reinforced resin molded product may be reduced.

  An object of the present invention is to provide a fiber-reinforced resin molded article having good surface properties while maintaining strength, an infusion molding method for producing the same, and a mold for infusion molding used in the molding method. There is.

(1)
A fiber-reinforced resin molded article according to one aspect includes a shaft body having at least one surface extension portion of a convex portion and a concave portion on an outer peripheral surface of an infusion mold, a fiber layer provided on the surface of the mold, and a fiber layer And impregnated resin.

  The fiber-reinforced resin molded product of the present invention can be molded using an infusion mold having a surface expansion portion. In infusion molding, when the fiber layer provided on the outer peripheral surface of the mold is compressed by vacuum pressure, wrinkles of the fiber layer can be made difficult to occur. In other words, the surface of the fiber-reinforced resin molded product can be adhered to a part or all of the surplus portion that has conventionally been generated as a flaw without being in close contact with the mold due to the vacuum pressure. Good properties.

(2)
The surface extension portion may be provided such that the surface extends the shaft outer peripheral surface by 3 percent or more and 10 percent or less.

  In this case, in the infusion molding of the fiber reinforced resin molded product, when the fiber layer provided on the outer peripheral surface of the molding die is compressed by the vacuum pressure, the fiber layer can be made less likely to wrinkle.

(3)
In the infusion mold in the fiber reinforced resin molded product, the surface of the surface extension portion and the outer peripheral surface may be connected by a smooth curved surface.

  In this case, since the boundary between the outer peripheral surface of the shaft body and the surface of the surface extension portion is smooth, the fibers are easily brought into close contact with the boundary in the infusion molding.

(4)
There may be a plurality of surface extension portions, and the plurality of surface extension portions may be arranged at equal intervals over the entire circumference of the outer periphery of the shaft body.

  In this case, in the infusion molding, when the fiber layer provided on the outer peripheral surface of the mold is compressed by the vacuum pressure, the fiber layer is easily adhered evenly in the circumferential direction.

(5)
The convex portion as the surface extension portion may be a protruding rib, and the concave portion may be a groove-like rib.

  In infusion molding, when the fiber layer provided on the outer peripheral surface of the mold is subjected to vacuum pressure, the shape of the wrinkles that has conventionally occurred is a rib shape. By setting it as the shape of a rib, a fiber layer can be closely stuck to a shaping | molding die.

(6)
The surface extension part may be arranged in parallel to the axis.
Or the surface expansion part may be arrange | positioned helically with respect to the axial center.

When the surface extension part is arranged in parallel to the shaft core, the fiber layer is evenly adhered in the axial direction when the fiber layer provided on the outer peripheral surface of the shaft body is subjected to vacuum pressure in infusion molding. Easy to make.
When the surface extension portion is disposed in a spiral shape with respect to the shaft core, the surface extension portion expands the surface in both the circumferential direction of the outer peripheral surface of the mold and the axial direction. The stress received by the entire fiber layer during loading can be dispersed. Furthermore, when the fiber reinforced resin molded product is used as a high-pressure pipe, the surface extension portion also contributes to reinforcing the strength against the pressure in the pipe.

(7)
There may be a plurality of surface extension portions, the convex portion may be a dot-like projection, and the concave portion may be a recessed hole.

In this case, in order to efficiently expand the surface of the surface extension part, when the fiber layer provided on the outer peripheral surface of the mold is subjected to vacuum pressure in infusion molding, the fiber layer is evenly adhered to the mold. Easy to make.
Furthermore, when the surface extension portion is a dot-like protrusion, the protrusion becomes a non-slip, and the fiber layer provided in the molding die is less likely to be displaced under a vacuum pressure load. Therefore, when the fiber layer is compressed by the vacuum pressure, the fiber It is easy to adhere the layer evenly to the mold.

(8)
The axis of the shaft body may be a straight line or a curved line.

When the shaft core of the shaft body is a straight line, the fiber-reinforced resin molded product has, for example, a straight pipe shape.
When the shaft core of the shaft body is a curve, the fiber-reinforced resin molded product has, for example, an elbow shape.
Furthermore, the straight line or curve may be branched.

(9)
The infusion mold in the fiber reinforced resin molded product may further include a flange portion.

  In this case, the fiber reinforced resin molded product can be connected to another configuration at the flange portion.

(10)
An infusion mold according to another aspect includes a shaft body having a surface extension portion of at least one of a convex portion and a concave portion on an outer peripheral surface.
The infusion mold of the present invention can be used for the production of the above-mentioned fiber-reinforced resin molded product.

(11)
The surface extension portion may be provided such that the surface extends the shaft outer peripheral surface by 3 percent or more and 10 percent or less.

  In this case, in the infusion molding, when the fiber layer provided on the outer peripheral surface of the mold is compressed by the vacuum pressure, the fiber layer can be made less likely to wrinkle.

(12)
There may be a plurality of surface extension portions, and the plurality of surface extension portions may be arranged at equal intervals over the entire circumference of the outer periphery of the shaft body.

  In this case, in the infusion molding, when the fiber layer provided on the outer peripheral surface of the mold is compressed by the vacuum pressure, the fiber layer is easily adhered evenly in the circumferential direction.

(13)
The convex portion as the surface extension portion may be a projecting rib, and may be arranged in parallel with the shaft core.

  In infusion molding, when the fiber layer provided on the outer peripheral surface of the mold is subjected to vacuum pressure, the shape of the wrinkles that has conventionally occurred is a rib shape. By doing so, the fiber layer can be efficiently adhered to the mold. Further, since the surface extension portion is arranged in parallel with the shaft core, in infusion molding, when the fiber layer provided on the outer peripheral surface of the shaft body is subjected to vacuum pressure, the fiber layer is oriented in the axial direction. Easy to adhere evenly.

(14)
According to still another aspect, a method for manufacturing a fiber-reinforced resin molded article includes a lamination step of laminating a reinforcing fiber layer on the above-described infusion mold, and a mold in which the reinforcing fiber layer is laminated is covered with an airtight film. A pressure reducing step for reducing the pressure in the film, and an impregnation step for impregnating the reinforcing fiber layer with the matrix resin.

  By using the above-mentioned infusion mold, the fiber layer provided on the outer peripheral surface of the mold can be made less likely to wrinkle the fiber layer when compressed by vacuum pressure, so that the molded product has a good surface. Can be obtained.

  According to the present invention, it is possible to provide a fiber reinforced resin molded article having good surface properties while maintaining strength, an infusion molding method for producing the same, and an infusion molding die used in the molding method. it can.

It is a typical external view showing an example of an infusion mold. It is typical sectional drawing which shows an example of the AA line cross section of FIG. It is a typical external view for demonstrating the manufacturing process of a fiber reinforced resin molded product. It is typical sectional drawing which shows an example of the BB line cross section of FIG. It is a typical external view for demonstrating the manufacturing process of a fiber reinforced resin molded product. It is typical sectional drawing which shows an example of the CC sectional view of FIG. It is typical sectional drawing which shows an example of a fiber reinforced resin molded product. It is a typical partial enlarged view which shows the other example of an infusion shaping | molding die. It is typical sectional drawing which shows the other example of an infusion shaping | molding die. It is a typical external appearance perspective view which shows the other example of an infusion shaping | molding die. It is a typical external appearance perspective view which shows the other example of an infusion shaping | molding die.

  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.

<Infusion mold>
FIG. 1 is a schematic external view showing an example of an infusion mold according to the first embodiment of the present invention. FIG. 2 is a schematic cross-sectional view showing an example of a cross section taken along line AA of FIG.

  Infusion mold 100 includes a shaft body 110 and a surface extension 120. As shown in FIG. 1, a guide pipe 130 and spiral tubes 140 and 150 are attached to the infusion mold 100. The guide pipe 130 and the spiral tubes 140 and 150 are not essential elements for configuring the infusion mold 100.

  The shaft body 110 is a straight tubular cylinder having a straight axis and a cylindrical hole 111. Specifically, the shaft body 110 is a polyvinyl chloride pipe (polyvinyl chloride joint 75A socket, manufactured by Sekisui Chemical Co., Ltd.).

  The shaft body 110 has a surface extension 120 on the outer peripheral surface 112. The surface extension portion 120 is formed so that the surface 121 thereof is convex on the opposite side of the shaft core in the radial direction of the shaft body 110 with respect to the outer peripheral surface 112 of the shaft body 110. The surface extension portion 120 is a protruding rib having a semicircular cross section that extends in parallel with the axial direction of the shaft body 110. Specifically, the surface extension 120 is a piece of wood. Four surface extension portions 120 are provided, and are arranged at equal intervals over the entire outer periphery of the shaft body 110.

  The surface extension 120 is fixed to the outer peripheral surface 112 of the shaft body 110 via an adhesive layer (not shown). Thereby, the surface expansion part 120 expands the outer peripheral surface 112 of the shaft body 110. Specifically, the outer peripheral surface of the infusion mold 100 (i.e., an exposed portion of the outer peripheral surface 112 of the shaft body 110 that is not provided with the surface expansion portion and a surface that contacts the adhesive layer in the surface expansion portion 120). The area of the exposed surface 121) is 3% or more and 10% or less larger than the area of the outer peripheral surface 112 of the shaft body 110 when the surface extension 120 is not provided.

  A guide pipe 130 is attached to the shaft body 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 cylindrical hole 111 of the shaft body 110, and one end of the guide pipe 130 is inserted into the cylindrical hole 111 so as to be coaxial. A portion of the outer peripheral surface of the guide pipe 130 exposed outside the cylindrical hole 111 is provided with a spiral tube 140 serving as an intake pipe and a spiral tube 150 serving as a resin injection pipe each being wound once. .

<Infusion molding method>
<Reinforcing fiber lamination process>
FIG. 3 is a schematic external view for explaining the reinforcing fiber laminating step in the infusion molding method using the infusion mold 100. 4 is a schematic cross-sectional view showing an example of a cross section taken along line BB in FIG.

  A layer of reinforcing fibers 300 is formed on the outer periphery of the infusion mold 100. The reinforcing fiber 300 layer is formed by winding and laminating seven sheet-like glass fibers (roving cloth, manufactured by Nitto Boseki Co., Ltd., product number WRE570B100HS) on the outer periphery of the infusion mold 100.

  In this case, as shown in FIG. 4, the inner side surface 301 of the layer of the reinforcing fibers 300 contacts only a part of the outer peripheral surface of the infusion mold 100. When a part of the layer of the reinforcing fiber 300 is lifted by the surface expanding portion 120, the infusion mold 100 and the reinforcing fiber 300 are near the boundary 115 between the surface 121 of the surface expanding portion 120 and the outer peripheral surface 112 of the shaft body 110. A gap S is formed between the inner surface 301 of the layer. Thereby, the layer of the reinforcing fiber 300 can be formed such that the inner side surface 301 of the layer of the reinforcing fiber 300 has a larger area than the outer peripheral surface 112 of the shaft body 110.

  A layer of release cloth 310 is formed on the surface of the layer of reinforcing fibers 300. Specifically, the release cloth 310 is 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 is 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 diffusion material 311 is formed on a part of the surface of the layer of the release cloth 310 on the side of the spiral tube 150 as the resin injection tube. Furthermore, in this case, the layer of the resin diffusion material 311 is formed so as to cover at least a part of the spiral tube 150.

  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 shaft body 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.

  A spiral tube 150 serving as a resin injection tube is provided with a resin injection tube 151 for injecting resin from the axial direction of the shaft body 110. Specifically, a T-type tube connector 152 is attached to a spiral tube 150 as a resin injection tube, and a resin injection tube 151 is connected to the T-type tube connector 152. In this case, the resin injection tube 151 is disposed in contact with the outer peripheral surface of the guide pipe 130. The resin injection tube 151 is connected to a resin supply pipe 154 connected to a matrix resin supply tank 153.

  The shaft 110 of the shaft body 110 is located on the outer peripheral surface of each of the guide pipes 130 so that both the spiral tube 140 serving as an intake pipe and the spiral tube 150 serving as a resin injection pipe are sandwiched between the spiral tubes 140 and 150. A sealing material 131 is provided outside the core direction. Specifically, the sealing material 131 may be an amorphous material such as butyl rubber or putty. The sealing material 131 is wound in a tubular shape so as to bundle the guide pipe 130 and the intake tube 141 and the resin injection tube 151 disposed on the outer peripheral surface of the guide pipe 130 at a time. In this case, the boundary between the outer peripheral surface of the guide pipe 130 and the outer peripheral surfaces of the intake tube 141 and the resin injection tube 151 is filled with the sealing material 131.

  Further, the cylindrical airtight film 132 surrounds the periphery of the infusion mold 100 in which the reinforcing fiber 300 layer, the release cloth 310 layer, and the resin diffusion material 311 layer are laminated. In this case, the airtight film 132 is disposed so as to cover the sealing material 131 on both sides.

<Decompression step and resin impregnation step>
FIG. 5 is a schematic external view for explaining a pressure reduction step and a resin impregnation step in an infusion molding method using the infusion molding die 100. 6 is a schematic cross-sectional view showing an example of a cross section taken along the line CC of FIG.

  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 decompressed, and the airtight film 132 contracts in a direction from the surface toward the shaft core of the shaft body 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. Furthermore, the air in the gap S (see FIG. 4) that existed between the inner side surface 301 of the layer of reinforcing fibers 300 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 lamination of the reinforcing fiber 300, the release cloth 310 and the resin diffusion material 311 is stretched along the outer peripheral surface of the infusion mold 100. I will. Specifically, the inner surface 301 of the layer of the reinforcing fiber 300 is located near the boundary 115 between the surface 121 of the surface extension 120 and the outer peripheral surface 112 of the shaft 110, and the surface 121 and the shaft 110 of the surface extension 120. It closely adheres to the outer peripheral surface 112 of the. In the infusion mold 100, an area corresponding to the reinforcing fiber layer of the surplus portion that has been generated as wrinkles without being in close contact with the infusion mold by the conventional method that does not use the surface expansion section 120 is secured in advance by the surface expansion section 120. Therefore, the inner side surface 301 of the layer of the reinforcing fiber 300 can be in close contact with the outer peripheral surface of the infusion mold 100 as described above. As a result, wrinkles of the reinforcing fiber 300 can be made difficult to occur.

  As a result, the matrix resin enters the reinforcing fiber 300 layer from the resin injection spiral tube 150 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). Thereby, the matrix resin is impregnated into the reinforcing fiber 300.

In this case, the resin diffusing material 311 is locally wound only on the resin supply side as described above to enable efficient resin impregnation.
In the portion where the resin diffusing material 311 is provided, the matrix resin travels along the resin diffusing material 311, so that the matrix resin is once uniformly distributed along the outer periphery of the stack. Further, in the portion where the resin diffusion material 311 is not provided, the matrix resin can proceed without being affected by the resin diffusion material 311, and thus the uniformly distributed matrix resin is in the exhaust direction (the direction of the arrow EX). In the process of being guided to, it becomes easy to impregnate in the thickness direction of the laminate.

  After the matrix resin is completely impregnated into the layer of the reinforcing fibers 300, the decompression process is completed by stopping the driving of the vacuum pump 143 before the impregnated matrix resin is completely cured or completely solidified.

  When the matrix resin is completely cured or semi-cured or completely solidified or semi-solidified (for example, when fully cured, 24 hours after the completion of the matrix resin impregnation), the release cloth 310 and the resin diffusion material 311 are removed, and FIG. The fiber reinforced resin molded article 400 shown is obtained. As described above, the fiber layer 300 (see FIG. 6) is less likely to wrinkle, so that the fiber reinforced resin 401 layer can be obtained with good surface properties.

<Fiber-reinforced resin molded product>
As shown in FIG. 7, the fiber reinforced resin molded product 400 includes an infusion mold 100 having a shaft body 110 and a surface expansion portion 120 provided on the outer peripheral surface 112 of the shaft body 110, and an infusion mold 100. A fiber reinforced resin 401 provided on the outer peripheral surface (that is, a composite material of a reinforcing fiber provided on the outer peripheral surface of the infusion mold 100 and a resin impregnated therein).

<Manufacture of infusion mold>
The infusion mold 100 can be manufactured by attaching a member to be the surface expansion portion 120 to the outer peripheral surface 112 of the shaft body 110. The attachment method can be appropriately determined by those skilled in the art in consideration of the material of the member that becomes the shaft body 110 and the surface extension 120.

Further, as will be described later, the shaft body 110 and the surface extension 120 may be integrated. In this case, using a mold in which both a portion corresponding to the surface extension portion 120 and a portion corresponding to the shaft body 110 are formed, the shaft body 110 and the surface extension portion 120 are manufactured integrally. Also good.
Furthermore, you may manufacture by manufacturing the flexible sheet | seat which has the surface expansion part 120 previously, and winding the said flexible sheet | seat around the shaft body 110, and attaching.

<Other examples>
8 to 11 show another example of the infusion mold 100 according to the first embodiment. In another example, a different point from 1st Embodiment is demonstrated and description is abbreviate | omitted about the same point.

FIGS. 8A and 8B are schematic partially enlarged views showing other examples of the infusion mold 100 according to the first embodiment.
In an infusion mold 100a shown in FIG. 8 (a), a shaft body 110a and a surface expansion portion 120a are integrally molded. FIG. 8A is an enlarged view of a portion corresponding to the square-enclosed portion in FIG. 2 of the infusion mold 100a (the same applies to FIG. 8B described later). In the infusion mold 100a, the surface extension portion 120a is provided such that the ridgeline of the surface 112a of the shaft body 110a and the ridgeline of the surface 121a of the surface extension portion 120a are bent, whereby both flat surfaces 112a, 121a is clearly delimited three-dimensionally by the boundary 115a.

  In an infusion mold 100b shown in FIG. 8B, a shaft body 110b and a surface extension portion 120b are integrally molded. Unlike the case of the infusion mold 100a, in the infusion mold 100b, the surface extension part 120b connects the ridge line of the surface 112b of the shaft body 110b and the ridge line of the surface 121b of the surface extension part 120b with a smooth curve. By providing in this way, both planes 112b and 121b are connected by a smooth curved surface without being clearly divided three-dimensionally at the boundary 115b.

  Thus, since the boundary 115b of both the planes 112b and 121b is smooth, the inner side surface 301 of the layer of the reinforcing fiber 300 is likely to be along the surface near the boundary 115b in the decompression step (see FIG. 6). That is, it is difficult to form a gap at the boundary 115b in the decompression step, and the adhesion of the reinforcing fiber 300 layer is good. Thereby, in the molded product obtained by the infusion mold 100b, it is easy to ensure the strength by the reinforcing fibers.

FIG. 9 is a schematic cross-sectional view showing another example of the infusion mold 100 according to the first embodiment, and corresponds to FIG.
The infusion mold 100c shown in FIG. 9 has a surface expansion portion 120c on the outer peripheral surface 112c of the shaft body 110c. The surface extension portion 120c is formed such that the surface 121c is recessed toward the axial center side in the radial direction of the shaft body 110c with reference to the outer peripheral surface 112c of the shaft body 110c.

FIG. 10 is a schematic external perspective view showing another example of the infusion mold 100 according to the first embodiment.
The infusion mold 100d shown in FIG. 10 has a surface expansion portion 120d on the outer peripheral surface of the shaft body 110d. The surface extension 120d is formed to be convex on the side opposite to the axis in the radial direction of the shaft 110d. The surface extension portion 120d is a protruding rib that is disposed in a spiral shape with respect to the axis of the shaft body 110d.

  By disposing the surface extension portion 120d in this manner, the stress received by the layer of the reinforcing fiber 300 in the decompression step (see FIG. 6) can be dispersed throughout the layer. Furthermore, when the fiber reinforced resin molded product obtained by the infusion mold 100d is used as a high-pressure pipe, the surface expansion portion 120d also contributes to reinforcing the strength against the pressure in the cylindrical hole 111d.

FIG. 11 is a schematic external perspective view showing another example of the infusion mold 100 according to the first embodiment.
The infusion mold 100e shown in FIG. 11 has a surface expansion portion 120e on the outer peripheral surface of the shaft body 110e. The surface extension 120e is a point-like protrusion that protrudes on the opposite side of the shaft core in the radial direction of the shaft 110e.

By providing the surface extending portion 120e in the manner of the point-like protrusions as described above, the outer peripheral surface of the shaft body 110e can be uniformly expanded in the circumferential direction and the axial direction of the shaft body 110e.
Further, in the decompression step (see FIG. 6), the protrusions also prevent slipping against the reinforcing fiber 300 layer. For this reason, the layer of the reinforcing fiber 300 can be uniformly adhered to the infusion mold 100e in the decompression step (see FIG. 6).

<Modification>
<Shaft>
In the first embodiment, a straight pipe having a straight shaft core is exemplified as the shaft body 110, but the shaft body 110 is not limited to this shape, and for example, the shaft core has a curved shape, specifically an elbow type or the like. It may be a shaft body having the following shape. Further, the shaft body may be a shaft body having a branched shaft core, specifically, a shaft body having a T shape or the like.
Further, in the first embodiment, the infusion mold 100 is exemplified by the shaft body 110 and the surface expansion portion 120. However, the shaft body 110 may have another structure added thereto. . For example, a flange portion may be added.
Further, in the first embodiment, the tubular body having the cylindrical hole 111 is illustrated as the shaft body 110. However, the shaft body 110 is not limited to this aspect, and may be a solid column body, for example.

<Surface extension part>
In 1st Embodiment, although the wood piece provided in the outer peripheral surface 112 of the shaft body 110 made from polyvinyl chloride was illustrated as the surface expansion part 120, the surface expansion part 120 is a different material from the shaft body 110. The same material. Moreover, the surface extension part 120 does not ask | require whether it is the same material as a matrix resin and a different material. When the surface expansion part 120 is the same material as a matrix resin, it is preferable from a viewpoint of adhesiveness with the fiber reinforced resin 401 in the fiber reinforced resin molded product 400.

  In the first embodiment, the elastic modulus of the surface extension 120 may be, for example, 8 GPa or more and 40 GPa or less. Here, the elastic modulus of the surface expansion portion 120 is preferably equal to or approximate to the elastic modulus of the fiber reinforced resin 401. For example, in the case of 1st Embodiment, it is preferable that it is the surface expansion part 120 which has the elasticity modulus within the above-mentioned range.

  The surface extension 120 may be a thermosetting composite material. In this case, it is preferable that the composition is equal to or close to that of the fiber reinforced resin 401. Thereby, the elastic modulus of the surface expansion portion 120 can be equal to or approximate to that of the fiber reinforced resin 401.

<Reinforcing fiber>
In the first embodiment, the glass fiber is exemplified as the reinforcing fiber 300, but is not limited thereto. For example, carbon fiber, aramid fiber, polyvinyl alcohol fiber, vinyl chloride fiber, acrylic fiber, polyester fiber, polyurethane fiber, It may be selected from polyethylene fibers, polypropylene fibers, polystyrene fibers, and acetate fibers and other organic synthetic fibers; metal fibers and other inorganic fibers; hemp and bamboo and other natural fibers; and rayon and other regenerated fibers. In particular, glass fiber, carbon fiber, and aramid fiber are suitable. Moreover, you may use the reinforcing fiber mentioned above in mixture of multiple types.

  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.

The layer of the reinforcing fiber 300 may be formed by using one or a plurality of reinforcing fibers 300 having the outer circumference of the shaft body 110 and winding the reinforcing fiber 300 around the infusion mold 100 to a predetermined layer thickness. it can.
Further, a plurality of small pieces of the reinforcing fibers 300 having the length shorter than the length of the outer periphery of the shaft body 110 are used, and each of the pieces is overlapped with each other and shifted in a predetermined direction such as a circumferential direction of the shaft body. It can also be formed by pasting up to a layer thickness. A mode in which a plurality of pieces of reinforcing fibers 300 are affixed is particularly preferable in the case where a shaft body having a curved axis and / or a shaft body having a plurality of shaft cores is used. In this case, those skilled in the art can appropriately create small pieces of the reinforcing fibers 300 having various shapes according to the outer peripheral surface shape of the shaft body.

  The strength and density of the reinforcing fiber 300 can be appropriately selected by those skilled in the art in consideration of the desired strength of the fiber-reinforced resin molded article 400 and the thickness of the fiber-reinforced resin 401 layer.

<Matrix resin>
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. When the viscosity exceeds 0.2 Pa · s, it becomes difficult for the matrix resin to impregnate the layer of the reinforcing fibers 300, and the impregnation time tends to be long, resulting in a decrease in productivity or poor impregnation.
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.

<Airtight film>
As the shape of the airtight film 132 used in the present embodiment, a shape corresponding to the shape of the shaft body 110 can be used as appropriate.
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.

<Intake pipe and resin injection pipe>
In the first embodiment, the spiral tubes 140 and 150 are shown as the intake pipe and the resin injection pipe, but the intake pipe and the resin injection pipe are not limited to such a mode. 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 for intake or resin injection may be used.

<Correspondence Relationship Between Each Part in Embodiment and Other Examples and Each Component in Claim>
In the present invention, the infusion molds 100, 100a, ..., 100e correspond to "infusion molds", the shaft bodies 110, 110a, ..., 110e correspond to "shaft bodies", and the outer peripheral surfaces 112, 112a, 112b and 112c correspond to the “outer peripheral surface”, the surface expansion portions 120, 120a, to 120e correspond to “surface expansion portions”, the reinforcing fibers 300 correspond to “reinforcing fibers”, and the airtight film 132 “ It corresponds to “airtight film”, and the fiber reinforced resin molded product 400 corresponds to “fiber reinforced resin molded product”.

  Although specific embodiments of the present invention have been described above, the present invention is not limited to these embodiments. Various other embodiments may be made without departing from the spirit and scope of the invention. Furthermore, in the above-mentioned embodiment, although the effect | action and effect by the structure of this invention were described, these effect | actions and effects are examples and do not limit this invention.

100, 100a, ..., 100e Infusion mold 110, 110a, ..., 110e Shaft body 112, 112a, 112b, 112c Shaft body outer surface 120, 120a, ..., 120e Surface expansion part 132 Airtight film 300 Reinforcing fiber 400 Fiber reinforced resin molded product

Claims (14)

An infusion mold including a shaft having a surface extension portion of at least one of a convex portion and a concave portion on the outer peripheral surface;
A fiber layer provided on the surface of the mold,
A fiber-reinforced resin molded article comprising a resin impregnated in the fiber layer.   The fiber-reinforced resin molded article according to claim 1, wherein the surface expansion part expands the outer peripheral surface by 3% or more and 10% or less.   The fiber-reinforced resin molded product according to claim 1 or 2, wherein the surface of the surface extension portion and the outer peripheral surface are connected by a smooth curved surface.   4. The device according to claim 1, wherein there are a plurality of the surface extension portions, and the plurality of surface extension portions are arranged at equal intervals over the entire circumference of the outer periphery of the shaft body. Fiber reinforced resin molded product. The convex part is a projecting rib, and the concave part is a grooved rib;
The fiber-reinforced resin molded article according to any one of claims 1 to 4, which is at least one of the following. The fiber according to any one of claims 1 to 5, wherein the surface extension portion is arranged in parallel to the axis, or the surface extension portion is arranged spirally with respect to the axis. Reinforced resin molded product. A plurality of the surface extensions,
The fiber-reinforced resin molded article according to any one of claims 1 to 4, wherein the convex portion is at least one of a dot-like projection and the concave portion is a recessed hole.   The fiber-reinforced resin molded article according to any one of claims 1 to 7, wherein an axis of the shaft body is a straight line or a curve.   The fiber-reinforced resin molded article according to any one of claims 1 to 8, further comprising a flange portion.   An infusion mold including a shaft body having a surface extension portion of at least one of a convex portion and a concave portion on an outer peripheral surface.   The infusion mold according to claim 10, wherein the surface extension part expands the outer peripheral surface by 3 percent or more and 10 percent or less.   12. The infusion mold according to claim 10, wherein there are a plurality of the surface extension portions, and the plurality of surface extension portions are arranged at equal intervals over the entire circumference of the outer periphery of the shaft body.   The infusion mold according to any one of claims 10 to 12, wherein the convex portion is a protruding rib, and the surface extension portion is arranged in parallel to the axis. A laminating step of laminating a reinforcing fiber layer on the infusion mold according to any one of claims 10 to 13,
A depressurizing step of covering the molding die on which the reinforcing fiber layer is laminated with an airtight film and depressurizing the inside of the airtight film;
An impregnation step of impregnating the reinforcing fiber layer with a matrix resin;
For producing a fiber-reinforced resin molded article containing

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