Abstract: The purpose of the present invention is to obtain a fiber-reinforced composite material having excellent appearance or mechanical characteristics, whereby a three-dimensional shape is molded with high productivity while appearance defects such as fiber meandering or wrinkling are suppressed. In this method for manufacturing a fiber-reinforced composite material, when a stack in which a plurality of sheet-shaped prepregs (X) in which a plurality of continuously arranged reinforcing fibers are impregnated with a matrix resin composition are layered in different fiber directions is molded into a three-dimensional shape by a molding die (100) provided with a lower die (110) and an upper die (112), a stretchable sheet (10) or a resin film (Y) used in the stack (12) is utilized. In this method for manufacturing a fiber-reinforced composite material, the stack may be pre-molded to obtain a preform, and the preform may be furthermore compression-molded to obtain a fiber-reinforced composite material.

Abstract: The purpose of the present invention is to obtain a fiber-reinforced composite material having excellent appearance or mechanical characteristics, whereby a three-dimensional shape is molded with high productivity while appearance defects such as fiber meandering or wrinkling are suppressed. In this method for manufacturing a fiber-reinforced composite material, when a stack in which a plurality of sheet-shaped prepregs (X) in which a plurality of continuously arranged reinforcing fibers are impregnated with a matrix resin composition are layered in different fiber directions is molded into a three-dimensional shape by a molding die (100) provided with a lower die (110) and an upper die (112), a stretchable sheet (10) or a resin film (Y) used in the stack (12) is utilized. In this method for manufacturing a fiber-reinforced composite material, the stack may be pre-molded to obtain a preform, and the preform may be furthermore compression-molded to obtain a fiber-reinforced composite material.

Abstract: The present invention relates to a method for manufacturing a fiber-reinforced composite material molding, having a step (A) for forming a plurality of partial preforms, each having a partial shape obtained by dividing the three-dimensional shape of a target fiber-reinforced composite material molding, by cutting a prepreg sheet containing reinforcing fibers and a matrix resin composition, and by preshaping the cut prepreg pieces; a step (B) for forming a preform having the three-dimensional shape of the target fiber-reinforced composite material molding by combining and integrating the plurality of partial preforms; and a step (C) for producing a fiber-reinforced composite material molding by compression-molding the preform, wherein the step (B) includes arranging a foamable material between the plurality of partial preforms when they are combined.

Abstract: A manufacturing method for a molded article of a fiber-reinforced composite material obtains a molded article of a fiber-reinforced composite material having a three-dimensional shape by: preparing a sheet-shaped prepreg containing reinforcing fibers and a matrix resin composition; preliminarily shaping the prepreg to produce a plurality of partial preforms having shapes obtained by dividing the shape of the molded article; producing a first partial preform group and a second partial preform group, which have the shape of the molded article, by combining the plurality of partial preforms so that the ends thereof in the direction perpendicular to the thickness direction do not overlap in the thickness direction; producing a preform by bringing the first and second partial preform groups into close contact with each other in the thickness direction; and compression molding the preform using a molding die.

Abstract: A method of producing a preform, having a step for preparing a sheet-shaped prepreg and a preform mold having a forming surface and a separable portion constituting at least a portion of the forming surface, forming the prepreg using the preform mold, and then removing the preform together with the separable portion from the preform mold.

Abstract: The purpose of the present invention is to obtain a fiber-reinforced composite material having excellent appearance or mechanical characteristics, whereby a three-dimensional shape is molded with high productivity while appearance defects such as fiber meandering or wrinkling are suppressed. In this method for manufacturing a fiber-reinforced composite material, when a stack in which a plurality of sheet-shaped prepregs (X) in which a plurality of continuously arranged reinforcing fibers are impregnated with a matrix resin composition are layered in different fiber directions is molded into a three-dimensional shape by a molding die (100) provided with a lower die (110) and an upper die (112), a stretchable sheet (10) or a resin film (Y) used in the stack (12) is utilized. In this method for manufacturing a fiber-reinforced composite material, the stack may be pre-molded to obtain a preform, and the preform may be furthermore compression-molded to obtain a fiber-reinforced composite material.

Abstract: The present invention relates to a method for manufacturing a fiber-reinforced composite material molding, having a step (A) for forming a plurality of partial preforms, each having a partial shape obtained by dividing the three-dimensional shape of a target fiber-reinforced composite material molding, by cutting a prepreg sheet containing reinforcing fibers and a matrix resin composition, and by preshaping the cut prepreg pieces; a step (B) for forming a preform having the three-dimensional shape of the target fiber-reinforced composite material molding by combining and integrating the plurality of partial preforms; and a step (C) for producing a fiber-reinforced composite material molding by compression-molding the preform, wherein the step (B) includes arranging a foamable material between the plurality of partial preforms when they are combined.

Abstract: A method of producing a preform, having a step for preparing a sheet-shaped prepreg and a preform mold having a forming surface and a separable portion constituting at least a portion of the forming surface, forming the prepreg using the preform mold, and then removing the preform together with the separable portion from the preform mold.

Abstract: A manufacturing method for a molded article of a fiber-reinforced composite material obtains a molded article of a fiber-reinforced composite material having a three-dimensional shape by: preparing a sheet-shaped prepreg containing reinforcing fibers and a matrix resin composition; preliminarily shaping the prepreg to produce a plurality of partial preforms having shapes obtained by dividing the shape of the molded article; producing a first partial preform group and a second partial preform group, which have the shape of the molded article, by combining the plurality of partial preforms so that the ends thereof in the direction perpendicular to the thickness direction do not overlap in the thickness direction; producing a preform by bringing the first and second partial preform groups into close contact with each other in the thickness direction; and compression molding the preform using a molding die.