Manufacturing method for molded article of fiber-reinforced composite material and molded article of fiber-reinforced composite materials

1. A manufacturing method for a molded article of fiber-reinforced composite material, the method comprising:

preparing a planar sheet-shaped prepreg comprising reinforcing fibers and a matrix resin composition;

preliminarily shaping the planar sheet-shaped prepreg, to produce a plurality of partial preforms having partial shapes obtained by dividing a shape of the molded article molded of the fiber-reinforced composite material, the preliminary shaping of the planar sheet-shaped prepreg comprising forming the planar sheet-shaped prepreg into three-dimensional shapes at least by bending and squeezing to obtain the plurality of partial preforms where each of the partial preforms has a three-dimensional shape;

combining the plurality of partial preforms to produce a first partial preform group and a second partial preform group, each of which has the shape of the molded article of the fiber-reinforced composite material; so that end portions of each of the plurality of partial preforms in a direction perpendicular to the thickness direction do not overlap in the thickness direction;

bringing the first partial preform group and the second partial preform group into contact with each other in the thickness direction to produce a preform; and

compression-molding the preform using a molding die to obtain the molded article of fiber-reinforced composite material.

2. The manufacturing method according to claim 1 , wherein the planar sheet-shaped prepreg is a laminated prepreg in which a plurality of prepreg sheets are laminated so that orientation directions of the reinforcing fibers of the overlapping prepreg sheets are different.

3. The manufacturing method according to claim wherein, in the first partial preform group and the second partial preform group, end surfaces of the plurality of partial preforms are disposed by butting against each other.

4. The manufacturing method according to claim 1 , wherein, when lines that divide the shape of the molded article of the fiber-reinforced composite material into the plurality of partial shapes are parting lines, a parting line of the plurality of partial shapes forming the first partial preform group and a parting line of the plurality of partial shapes forming the second partial preform group are disposed so as not to overlap each other on a same line.

5. The manufacturing method according to claim 1 , wherein the three-dimensional shape is a three-dimensional shape comprising a point at which three or more surfaces intersect with one another.

6. A molded article of fiber-reinforced composite material manufactured by the manufacturing method according to claim 1 , wherein after combining the plurality of partial preforms to produce the first partial preform group and the second partial preform group, none of the plurality of the partial performs are attached to another one of the partial preforms.

7. The manufacturing method according to claim 2 , wherein, in the first partial preform group and the second partial preform group, end surfaces of the plurality of partial preforms are disposed by butting against each other.

8. The manufacturing method according to claim 2 , wherein, when lines that divide the shape of the molded article of the fiber-reinforced composite material into the plurality of partial shapes are parting lines, a parting line of the plurality of partial shapes forming the first partial preform group and a parting line of the plurality of partial shapes forming the second partial preform group are disposed so as not to overlap each other on a same line.

9. The manufacturing method according to claim 3 , wherein, when lines that divide the shape of the molded article of the fiber-reinforced composite material into the plurality of partial shapes are parting lines, a parting line of the plurality of partial shapes forming the first partial preform group and a parting line of the plurality of partial shapes forming the second partial preform group are disposed so as not to overlap each other on a same line.

10. The manufacturing method according to claim 7 , wherein, when lines that divide the shape of the molded article of the fiber-reinforced composite material into the plurality of partial shapes are parting lines, a parting line of the plurality of partial shapes forming the first partial preform group and a parting line of the plurality of partial shapes forming the second partial preform group are disposed so as not to overlap each other on a same line.

11. The manufacturing method according to claim 2 , wherein the three-dimensional shape is a three-dimensional shape comprising a point at which three or more surfaces intersect with one another.

12. The manufacturing method according to claim 3 , wherein the three-dimensional shape is a three-dimensional shape comprising a point at which three or more surfaces intersect with one another.

13. The manufacturing method according to claim 4 , wherein the three-dimensional shape is a three-dimensional shape comprising a point at which three or more surfaces intersect with one another.

14. The manufacturing method according to claim 7 , wherein the three-dimensional shape is a three-dimensional shape comprising a point at which three or more surfaces intersect with one another.

15. The manufacturing method according to claim 8 , wherein the three-dimensional shape is a three-dimensional shape comprising a point at which three or more surfaces intersect with one another.

16. The manufacturing method according to claim 9 , wherein the three-dimensional shape is a three-dimensional shape comprising a point at which three or more surfaces intersect with one another.

17. The manufacturing method according to claim 10 , wherein the three-dimensional shape is a three-dimensional shape comprising a point at which three or more surfaces intersect with one another.

18. A molded article of fiber-reinforced composite material manufactured by the manufacturing method according to claim 2 , wherein after combining the plurality of partial preforms to produce the first partial preform group and the second partial preform group, none of the plurality of the partial performs are attached to another one of the partial preforms.

19. A molded article of fiber-reinforced composite material manufactured by the manufacturing method according to claim 17 , wherein after combining, the plurality of partial preforms to produce the first partial preform group and the second partial preform group none of the plurality of the partial performs are attached to another one of the partial preforms.