JP2018202753A - Method for manufacturing carbon fiber reinforced resin member - Google Patents

Abstract

To provide a method for manufacturing a carbon fiber reinforced resin member obtaining a satisfactory dimensional accuracy in a direction needed by the member.SOLUTION: The method for manufacturing a carbon fiber reinforced resin member includes the steps of: prepreg sheet lamination for laminating a prescribed number of prepreg sheets containing a carbon fiber upon an outer circumferential surface of a core mold 101; forming into a prescribed shape by pressing an outer mold 106, having a prescribed inner shape and divided into a plurality, onto the outer circumferential surface of the laminated prepreg sheet 110; and heating and curing the prepreg sheet laminated in a state sandwiched by the core mold and the outer mold. The method also provides an allowance space 108, for absorbing a surplus part of the prepreg sheet 110 having lost the escape space between the core mold and the outer mold in the forming step and the heating and curing step, at a position away from the surface where dimensional accuracy of the carbon fiber reinforced resin member is required, on the inner circumferential surface configured by the plurality of the outer molds.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a method for manufacturing a carbon fiber reinforced resin member used in a field where dimensional accuracy in a predetermined direction is required.

  Since carbon fiber reinforced resin is lightweight and has high strength characteristics, it is used in various fields such as an aircraft fuselage and a robot hand.

  As a document disclosed about the technique which shape | molds the member which consists of such a carbon fiber reinforced resin, for example in following patent document 1, it is a shaping | molding die used when hardening the cylindrical laminated body which laminated | stacked the prepreg, A cylindrical core mold located inside the laminate, and a surface mold consisting of a plurality of partial surface molds located outside the laminate, wherein each partial surface mold is a Fiber reinforcement that covers the entire outer peripheral surface in a line in the circumferential direction so as to form a cylinder, and the amount of fibers whose fiber direction is the circumferential direction of the cylinder and the amount of fibers whose fiber direction is the axial direction of the cylinder are different. Each partial surface mold is formed of resin, and is configured such that the thermal expansion coefficient in the circumferential direction of the cylinder is closer to the thermal expansion coefficient of the core mold than the axial direction of the cylinder. Type is disclosed .

  Further, in Patent Document 2 below, in a method for manufacturing a robot hand member attached to an arm portion of an industrial robot, a core material having a predetermined cross-sectional shape using a material having heat non-deformability below a predetermined temperature. A step of winding a prepreg sheet containing reinforcing fibers around the outer peripheral surface of the sheet, and a step of pressing an outer mold having a predetermined inner surface shape onto the outer peripheral surface of the wound prepreg sheet to form the outer surface shape of the prepreg sheet into a predetermined dimension A step of heating the molded prepreg sheet to a predetermined temperature and thermosetting it to obtain a fiber reinforced composite material, and a step of extracting the core material from the member made of the fiber reinforced composite material to form a hollow structure. A method for manufacturing a robot hand member is disclosed.

Japanese Patent No. 5698526

Japanese Patent Laid-Open No. 2002-292591

  However, when a prepreg sheet made of a carbon fiber composite material is laminated on a core mold and heat-cured while pressing the outside with a plurality of outer molds, the prepreg sheet is wrinkled, and the surface of the molded product is irregular. There was a problem that cocoons were formed.

  For example, when trying to manufacture parts such as machine tools using carbon fiber reinforced resin, dimensional accuracy in a predetermined direction is required to be high. In addition to the need for processing, there was a problem that the strength was reduced by cutting.

  Accordingly, an object of the present invention is to provide a method for producing a carbon fiber reinforced resin member in which sufficient dimensional accuracy in the direction required for the member is obtained.

  In order to achieve the above object, the present invention has a prepreg sheet laminating step of laminating a predetermined number of prepreg sheets containing carbon fibers on an outer peripheral surface of a core mold, and a predetermined inner surface shape on the outer peripheral surface of the stacked prepreg sheets. A carbon fiber comprising: a molding step of pressing a plurality of outer molds into a predetermined shape; and a heat curing step of heat curing the laminated prepreg sheet while being sandwiched between the core mold and the outer mold In the manufacturing method of the reinforced resin member, in the molding step and the heat curing step, the inner peripheral surface constituted by the plurality of outer molds is positioned away from the surface where the dimensional accuracy of the carbon fiber reinforced resin member is required. A carbon fiber reinforced resin member characterized by providing a clearance space for absorbing the surplus portion of the prepreg sheet that has lost its place between the core mold and the outer mold. There is provided a manufacturing method.

  According to the present invention, in the molding process and the heat curing process, the excess portion of the prepreg sheet that has lost its place between the core mold and the outer mold flows into the escape space, so that the prepreg is provided on the surface where dimensional accuracy is required. It is possible to suppress sheet wrinkling. As a result, after molding and curing, the necessity for polishing processing or the like for obtaining dimensional accuracy can be reduced, the manufacturing workability can be improved, and the manufacturing cost can be reduced.

  According to a preferred aspect of the present invention, the clearance space is formed by chamfering the inner peripheral corner portion, which is a butt portion of the plurality of outer molds, into an R shape or a taper shape. According to this aspect, in the molding process and the heat curing process, the surplus portion of the prepreg sheet that has lost its place between the core mold and the outer mold is provided at the inner peripheral corner that becomes the butted portion of the plurality of outer molds. Since it flows into the escape space, it is possible to prevent wrinkles from occurring on the surface pressed by each outer mold, that is, the surface where dimensional accuracy is required.

  In the present invention, it is preferable to use a material having a larger thermal expansion coefficient than that of the carbon fiber reinforced resin member. According to this aspect, when the temperature is lowered after the heat curing step, the core mold is contracted more greatly than the carbon fiber reinforced resin member that has been molded and cured, so that the core mold can be easily extracted.

  In the present invention, it is preferable that the outer mold has a thermal expansion coefficient smaller than that of the core mold. According to this aspect, the laminate of the prepreg sheet can be effectively pressed between the core mold and the outer mold, and the dimensional accuracy of the outer diameter of the molded carbon fiber reinforced resin member can be easily increased. .

  In one preferable aspect of the present invention, the core mold is formed in a cylindrical or columnar shape, and the outer mold is composed of four blocks having an arcuate curved surface whose inner surface is divided into four at equal angles in the circumferential direction. The inner peripheral corner portion that becomes the abutting portion of the four blocks of the outer mold is chamfered in an R shape or a taper shape. According to this aspect, in the molding step and the heat curing step, the rib-like protrusions formed by the wrinkles of the prepreg sheet are formed along the axial direction at four locations in the circumferential direction of the outer peripheral surface. A carbon fiber reinforced resin member can be obtained. The cylindrical carbon fiber reinforced resin member has a cylindrical shape with high dimensional accuracy with no generation of wrinkles other than the portion where the rib-shaped protrusions on the outer peripheral surface are formed.

  In another preferred embodiment of the present invention, the core mold has a rectangular tube or prismatic shape whose corners are chamfered in an R shape or a taper shape, and the outer mold is the end surface side of the rectangular tube or the prismatic shape. It comprises a plurality of blocks each covering a surface corresponding to each side when viewed from the side, and has an inner peripheral corner portion which becomes a butting portion of each block of the outer mold and is chamfered in an R shape or a taper shape. According to this aspect, in the molding process and the heat curing process, the rectangular tube-shaped carbon fiber reinforced resin member in which rib-shaped protrusions formed by the wrinkles of the prepreg sheet are formed along the corners of each side. Can be obtained. This carbon fiber reinforced resin member has a square tube shape with high dimensional accuracy without generating wrinkles on the surface corresponding to each side when viewed from the end surface side excluding the corner portion.

  According to the present invention, in the molding process and the heat curing process, the excess portion of the prepreg sheet that has lost its place between the core mold and the outer mold flows into the escape space, so that the prepreg is provided on the surface where dimensional accuracy is required. It is possible to suppress sheet wrinkling. As a result, after molding and curing, the necessity for polishing processing or the like for obtaining dimensional accuracy can be reduced, the manufacturing workability can be improved, and the manufacturing cost can be reduced.

It is a disassembled perspective view which shows an example of the shaping | molding die for enforcing the manufacturing method of the carbon fiber reinforced resin member of this invention. It is an end elevation which shows the state which presses the laminated body of a prepreg sheet using the same shaping | molding die. It is a perspective view which shows the carbon fiber reinforced resin member manufactured using the same shaping | molding die. It is a disassembled perspective view which shows the other example of the shaping | molding die for enforcing the manufacturing method of the carbon fiber reinforced resin member of this invention. It is an end elevation which shows the state which presses the laminated body of a prepreg sheet using the same shaping | molding die. It is a perspective view which shows the carbon fiber reinforced resin member manufactured using the same shaping | molding die. It is a photograph which shows an example which manufactured the carbon fiber reinforced resin member using the shaping | molding die which does not have escape space. It is a photograph which shows an example which manufactured the carbon fiber reinforced resin member using the shaping | molding die of this invention which has escape space.

 Hereinafter, although the embodiment of the manufacturing method of the carbon fiber reinforced resin member of the present invention is described, the present invention is not limited to these embodiments.

In the present invention, as the prepreg sheet containing carbon fibers, a sheet obtained by impregnating a thermosetting resin into a base sheet in which carbon fibers are arranged in a predetermined direction is preferably used.
As the carbon fiber, a long fiber having a fiber diameter of preferably 3 to 15 μm, more preferably 5 to 10 μm is preferably used. The carbon fiber base sheet may be one in which carbon fibers are aligned and aligned in the same direction, may be a woven fabric in which carbon fibers are knitted, or may be deposited by changing the direction of carbon fibers. There may be.

  Examples of thermosetting resins include epoxy resins, unsaturated polyester resins, polyvinyl ester resins, phenol resins, guanamine resins, polyimide resins such as bismaleide and triazine resins, furan resins, polyurethane resins, polydiallyl phthalate resins, Examples include melamine resin, urea resin, and amino resin.

  Among these, an epoxy resin is preferably used from the viewpoint of suppressing thermal shrinkage during molding. As the main component of the epoxy resin, a bisphenol A type epoxy resin, a phenol novolac type epoxy resin, or a glycidylamine type epoxy resin is preferably used. On the other hand, as the curing agent, a curing agent system in which dichlorophenyldimethylurea is combined with dicyandiamide is preferably used because it has an excellent balance of workability and physical properties.

  Although the thickness of a prepreg sheet is not specifically limited, 0.05-0.4 mm is preferable normally and 0.1-0.2 mm is more preferable. The number of prepreg sheets laminated when the carbon fiber reinforced resin member is produced is also not particularly limited, but is usually preferably 2 to 200 and more preferably 4 to 100.

  20-80 mass% is preferable and, as for content of the carbon fiber in a prepreg sheet, 40-70 mass% is more preferable. If the carbon fiber content is too high, sufficient flexibility during molding may not be obtained, and the fiber may be raised on the surface. If the carbon fiber content is too low, the desired strength can be obtained. It becomes difficult to be.

  In the present invention, the material of the core mold and the outer mold is not particularly limited as long as it has strength and heat resistance in the molding process and the heat curing process. For example, metals such as aluminum and aluminum alloys, gypsum , Ceramics, heat resistant resin, and the like.

  In this case, as the core material, a material having a coefficient of thermal expansion greater than that of the carbon fiber reinforced resin member is preferably used. For example, aluminum, an aluminum alloy, or the like is preferably used. By using a material having a thermal expansion coefficient larger than that of the carbon fiber reinforced resin member as the core material, it is possible to increase the pressing force on the laminated prepreg sheets during heat curing, and the heat curing is completed. Then, when cooled, it can shrink more greatly than the molded carbon fiber reinforced resin member to facilitate release.

  Further, as the material of the outer mold, it is preferable to use a material having a thermal expansion coefficient smaller than that of the core mold, and for example, plaster is preferably used. As the material of the outer mold, a laminate of prepreg sheets is effective between the inner mold and the outer mold at the time of heat curing by using a material having a thermal expansion coefficient smaller than that of the core mold. And the dimensional accuracy of the outer diameter of the carbon fiber reinforced resin member to be molded is easily increased.

  The method for producing a carbon fiber reinforced resin member of the present invention includes a prepreg sheet laminating step of laminating a predetermined number of prepreg sheets containing carbon fibers on an outer peripheral surface of a core mold, and a predetermined inner surface shape on the outer peripheral surface of the laminated prepreg sheets. A molding step of pressing a plurality of divided outer molds into a predetermined shape, and a heat curing step of heat curing the laminated prepreg sheets in a state of being sandwiched between the core mold and the outer mold. It is out.

  In the molding step, the pressing force when pressing the laminated prepreg sheet between the outer mold and the inner mold may be appropriately set according to a conventional method, but is usually preferably 100 to 600 kPa, and 200 to 400 kPa. Is more preferable.

  The heating temperature in the heat curing step may be appropriately determined according to the thermosetting resin to be employed. For example, when an epoxy resin is used, 100 to 160 ° C is preferable, and 120 to 140 ° C is more preferable. Although the heat curing time is not particularly limited, it is preferably 30 minutes to 10 hours, more preferably 2 hours to 7 hours.

  In addition, it is preferable that a mold release agent is apply | coated to the inner surface of an inner mold | type and an outer mold | type, or a mold release sheet is interposed so that it may be easy to remove after molding. As the release agent and the release sheet, commercially available products can be used.

  The greatest feature of the present invention is that, in the molding process and the heat curing process, the core mold and the inner peripheral surface constituted by a plurality of outer molds are positioned away from the surface where the dimensional accuracy of the carbon fiber reinforced resin member is required. The object is to provide a clearance space for absorbing the excess portion of the prepreg sheet that has lost its place between the outer molds. Hereinafter, the specific aspect is demonstrated with reference to drawings.

  FIG. 1 shows an example of a mold for carrying out the method for producing a carbon fiber reinforced resin member of the present invention. The mold 100 includes a core mold 101 and an outer mold 106. In the case of this embodiment, the core mold 101 has a columnar shape, and a material having a thermal expansion coefficient larger than that of the carbon fiber reinforced resin member is preferably used. For example, the core mold 101 is made of aluminum or the like.

  The outer mold 106 includes four divided molds 102, 103, 104, and 105, and a cylindrical inner peripheral surface that surrounds the core mold 101 is configured by the inner peripheral surfaces thereof. The inner diameter of the cylindrical inner peripheral surface formed by the four split molds 102, 103, 104, 105 is larger than the outer diameter of the core mold 101, and a prepreg laminate 110 described later can be sandwiched between them. It is like that. The outer mold 106 is preferably made of a material whose coefficient of thermal expansion is smaller than that of the core mold 101, and is formed of, for example, plaster.

  Referring also to FIG. 2, a tapered or R-shaped chamfered portion 107 is formed at the inner peripheral corners of the butted portions of the four split molds 102, 103, 104, and 105. Then, when the four split molds 102, 103, 104, 105 are arranged outside the prepreg laminate 110 laminated on the outer periphery of the core mold 101 and they are put together, the chamfered portion 107 causes the inner portion of the butt portion to be aligned. A clearance space 108 is formed at the peripheral corner.

  The prepreg laminate 110 is formed by laminating a plurality of prepreg sheets containing the above-described carbon fibers on the outer periphery of the core mold 101 (lamination step). In this case, in the prepreg sheet using the base sheet in which the carbon fibers are aligned and aligned in the same direction, variation in strength due to the direction can be suppressed by stacking while changing the direction of the carbon fibers little by little. . Moreover, when it is desired to increase the strength in a predetermined direction depending on the application, the lamination direction of the prepreg sheets can be adjusted so that many carbon fibers are oriented in that direction.

  In addition, in a prepreg sheet using a woven fabric knitted with carbon fibers as a base sheet, it is not always necessary to laminate the carbon fiber while changing the direction of the carbon fibers. By changing the ratio of the weft yarn to the yarn, the carbon fibers can be arranged more in the desired direction, and the strength in the desired direction can be increased.

  Then, an outer mold 106 including four divided molds 102, 103, 104, and 105 is arranged on the outer periphery of the prepreg laminate 110, and the prepreg laminate 110 is pressed and clamped between the core mold 101 and the outer mold 106. Thus, the prepreg laminate 110 is formed into a cylindrical shape (molding step).

Further, in this state, the whole is placed in an autoclave or the like and heated to cure the thermosetting resin made of epoxy resin or the like (heat curing step).
In the molding step and the heat curing step, the surplus portion of the pressed prepreg laminate 110 loses its place and becomes wrinkled. In the present invention, of the butted portions of the four split molds 102, 103, 104, and 105 Since the escape space 108 is formed at the peripheral corner, the surplus portion of the prepreg laminate 110 is absorbed by the escape space 108, and the occurrence of wrinkles in other portions is suppressed.

  Then, after the thermosetting resin is sufficiently cured, it is cooled, the core mold 101 is pulled out, and the four divided molds 102, 103, 104, 105 of the outer mold 106 are removed, and the molded carbon fiber reinforced resin. A member can be obtained. In this case, as the material of the core mold 101, the core mold 101 is contracted more greatly than the molded carbon fiber reinforced resin member by using a material having a thermal expansion coefficient larger than that of the carbon fiber reinforced resin member. Can make it easy to release.

  As shown in FIG. 3, the carbon fiber reinforced resin member 111 thus obtained has a cylindrical shape as a whole, and has a shape in which ribs 113 are formed along the axial direction at four locations in the circumferential direction of the cylindrical surface 112. The portions other than the rib 113 of the cylindrical surface 112 are free from wrinkles and have high dimensional accuracy. For this reason, when using as parts, such as a machine tool, the carbon fiber reinforced resin member 111 can be correctly arrange | positioned in a predetermined position by incorporating parts other than the rib 113 of the cylindrical surface 112 as a holding surface.

  FIG. 4 shows an example of a mold for carrying out the method for producing a carbon fiber reinforced resin member of the present invention. The molding die 200 has a basic configuration similar to that of the embodiment described above except that the shape of the target molded product is changed from a cylinder to a square tube whose corners are chamfered in an R shape. The description will be simplified by simply changing the 100-digit number to 2 and expressing the 10-digit and single-digit numbers in common.

  That is, the mold 200 includes a core mold 201 having a rectangular tube shape with corners chamfered in an R shape, and an outer mold 206 including four divided molds 202, 203, 204, and 205 disposed on the outer periphery thereof. It consists of The four divided molds 202, 203, 204, and 205 are provided corresponding to the planar portion of the core mold 201, and their butted portions are portions that surround the corner portions of the core mold 201 that are chamfered in an R shape. ing. The inner diameter of the inner peripheral surface when the four divided molds 202, 203, 204, 205 are abutted is larger than the outer diameter of the core mold 201, so that the prepreg laminate 210 is sandwiched between them. It has become.

  Referring also to FIG. 5, a tapered or R-shaped chamfered portion 207 is formed at the inner peripheral corner of the butt portion of the four split molds 202, 203, 204, 205. When the two are brought into contact with each other, a relief space 208 is formed.

  Since the manufacturing method of the carbon fiber reinforced resin member using the molding die 200 is the same as that of the above embodiment, the description thereof is omitted. However, in the molding process and the heat curing process, the prepreg laminate 210 is not described. Since the surplus portion is absorbed by the escape space 208, the occurrence of wrinkles in other portions is suppressed.

  As shown in FIG. 6, the carbon fiber reinforced resin member 211 obtained in this way has four flat portions 212 and four formed along the axial direction at the R-shaped corners provided therebetween. And ribs 213. The rib 213 is formed by absorbing the surplus portion of the prepreg laminate 210 into the escape space 208, whereby the flat portion 212 is free from wrinkles and has a high dimensional accuracy. . For this reason, when using as components, such as a machine tool, the carbon fiber reinforced resin member 211 can be correctly arrange | positioned in a predetermined position by incorporating the plane part 212 as a holding surface.

  In addition, the shaping | molding die used with the manufacturing method of this invention is not restricted to the said embodiment, According to the shape of the target carbon fiber reinforced resin member, it can change suitably. Further, the method for forming the relief space is not limited to the method using the chamfered portion provided at the inner peripheral corner of the split-type butting portion as shown in the above embodiment, and the groove in which wrinkles enter the inner peripheral surface of the outer mold. It is also possible to adopt a method such as forming.

  The carbon fiber reinforced resin member 111 was formed by molding the prepreg laminate 110 using the molding die 100 shown in FIG. As the core mold 101, an aluminum cylindrical member having an outer diameter of 10.4 cm was used. As the outer mold 106, four divided molds 102, 103, 104, and 105 made of gypsum were used. The inner diameter of the cylindrical inner periphery formed by abutting the four split molds 102, 103, 104, 105 is 11.9 cm.

  A 0.15 mm thick prepreg sheet (trade name “Dialead”, Mitsubishi Rayon Co., Ltd.) impregnated with epoxy resin on a substrate in which carbon fibers are aligned in a predetermined direction and impregnated with epoxy resin. 48) were laminated on the outer periphery of the core mold 101 while gradually changing the direction of the carbon fibers to form a prepreg laminate 110.

  As shown in FIG. 2, four split molds 102, 103, 104, and 105 are arranged on the outer periphery of the prepreg laminate 110, and are clamped so as to be pressed toward the core mold 101, so that the prepreg laminate is obtained. 110 was sandwiched between the core mold 101 and the outer mold 106 to form the prepreg laminate 110 into a cylindrical shape. Note that a release agent was applied in advance to the outer peripheral surface of the core mold 101 and the inner peripheral surface of the outer mold 106.

  Next, the whole was placed in an autoclave and heated at about 130 ° C. for about 300 minutes to cure the epoxy resin. Then, it cooled, the core mold | type 101 was pulled out, the outer mold | type 106 was removed, and the carbon fiber reinforced resin member 111 of the shape shown in FIG. 3 was obtained.

  A photograph of this carbon fiber reinforced resin member 111 is shown in FIG. As shown in FIG. 7, the carbon fiber reinforced resin member 111 had a cylindrical shape with no wrinkles on the surface of the cylindrical surface 112 other than the ribs 113 and a smooth outer peripheral surface.

  On the other hand, in the molding die 100 shown in FIG. 1, the one in which the chamfered portion 107 and the relief space 108 are not provided at the inner peripheral corner portion of the butt portion of the four split dies 102, 103, 104, 105 is used. Similarly, a cylindrical carbon fiber reinforced resin member was produced.

  A photograph of the carbon fiber reinforced resin member thus obtained is shown in FIG. As shown in FIG. 8, the carbon fiber reinforced resin member has irregular wrinkles on the surface, and cannot be used as it is as a member requiring dimensional accuracy.

DESCRIPTION OF SYMBOLS 100 Mold 101 Core mold 102,103,104,105 Split mold 106 Outer mold 107 Chamfering part 108 Relief space 110 Prepreg laminated body 111 Carbon fiber reinforced resin member 112 Cylindrical surface 113 Rib 200 Mold 200 201 Core molds 202, 203, 204 , 205 Split mold 206 Outer mold 207 Chamfered portion 208 Relief space 210 Prepreg laminate 211 Carbon fiber reinforced resin member 212 Flat portion 213 Rib

Claims (6)

A prepreg sheet laminating step of laminating a predetermined number of carbon fiber-containing prepreg sheets on the outer peripheral surface of the core mold;
A molding step having a predetermined inner surface shape on the outer peripheral surface of the laminated prepreg sheets, and pressing the outer mold divided into a plurality of shapes into a predetermined shape;
In a method for producing a carbon fiber reinforced resin member comprising a heat curing step of heat curing the laminated prepreg sheet while being sandwiched between the core mold and the outer mold,
In the molding step and the heating and curing step, the core die and the outer die are located at positions where the inner peripheral surface constituted by the plurality of outer die is out of the surface where the dimensional accuracy of the carbon fiber reinforced resin member is required. A process for producing a carbon fiber reinforced resin member, characterized in that a clearance space is provided for absorbing the surplus portion of the prepreg sheet that has lost its destination.   The method for producing a carbon fiber reinforced resin member according to claim 1, wherein the clearance space is formed by chamfering inner peripheral corner portions serving as butted portions of the plurality of outer molds in an R shape or a taper shape.   The method for producing a carbon fiber reinforced resin member according to claim 1 or 2, wherein a coefficient of thermal expansion of the core mold is larger than that of the carbon fiber reinforced resin member.   The method for producing a carbon fiber reinforced resin member according to any one of claims 1 to 3, wherein a coefficient of thermal expansion of the outer mold is smaller than that of the core mold.   The core mold has a cylindrical or columnar shape, and the outer mold includes four blocks each having an arcuate curved surface whose inner surface is divided into four at equal angles in the circumferential direction, and the four blocks of the outer mold are matched. The manufacturing method of the carbon fiber reinforced resin member of any one of Claims 1-4 which makes the shape which chamfered the inner peripheral corner | angular part used as a part in R shape or a taper shape.   The core mold has a rectangular tube or a prismatic shape whose corners are chamfered in an R shape or a taper shape, and the outer mold has a surface corresponding to each side of the rectangular tube or the prismatic shape as viewed from the end surface side. 5. The structure according to claim 1, which is configured by a plurality of blocks each covering, and has a shape in which an inner peripheral corner portion serving as a butting portion of each block of the outer mold is chamfered in an R shape or a taper shape. Manufacturing method of carbon fiber reinforced resin member.