Method for molding fiber-reinforced plastic
View Patent ↗The present invention relates to a method for molding fiber-reinforced plastic that is characterized: in comprising a process ( 1 ) for accommodating flowable grains comprising multiple particles in a flexible bag to form a core, a process ( 2 ) for interposing the core between fabric configured from fibers and placing the fabric and core inside a molding die, and a process ( 3 ) for injecting a resin into the molding die into which the fabric and core have been placed and curing; and in that, when performing the curing in process ( 3 ), a portion of one of the outer surfaces of the core is pressed and deformed by a pressing means to increase the internal pressure inside the core. The present invention provides a method for manufacturing fiber-reinforced plastics of excellent external appearance in which there are no defects such as wrinkles in the outer surface during forming using a core.
1. A method of molding a fiber-reinforced plastic, comprising injecting a resin into a molding die in which a fiber fabric and a core have been placed, and then performing curing;
wherein:
the core comprises a flowable granular material comprising particles in a flexible bag,
the core is interposed between the fabric in the molding die, and
during the curing, a portion of an outer surface of the core is deformed by pressing by projecting a pressing member into a cavity of the molding die, thereby increasing an internal pressure inside the core.
2. The method of claim 1 , wherein the flexible bag is a packaging film, and core is formed by vacuum-packaging the granular material with the packaging film.
3. The method of claim 2 , wherein the granular material comprises particles having different diameters.
4. The method of claim 3 , further comprising mold clamping pressurization after injecting the resin.
5. The method of claim 4 , further comprising, after injecting the resin:
opening a fluid-discharging hole at a position of a deformed portion of the outer surface of the core by pressing; and
discharging the particles through the fluid-discharging hole.
6. The method of claim 3 , further comprising, after injecting the resin:
opening a fluid-discharging hole at a position of a deformed portion of the outer surface of the core by pressing; and
discharging the particles through the fluid-discharging hole.
7. The method of claim 2 , further comprising mold clamping pressurization after injecting the resin.
8. The method of claim 7 , further comprising, after injecting the resin:
opening a fluid-discharging hole at a position of a deformed portion of the outer surface of the core by pressing; and
discharging the particles through the fluid-discharging hole.
9. The method of claim 2 , further comprising, after injecting the resin:
opening a fluid-discharging hole at a position of a deformed portion of the outer surface of the core by pressing; and
discharging the particles through the fluid-discharging hole.
10. The method of claim 1 , wherein the granular material comprises particles having different diameters.
11. The method of claim 10 , further comprising mold clamping pressurization after injecting the resin.
12. The method of claim 11 , further comprising, after injecting the resin:
opening a fluid-discharging hole at a position of a deformed portion of the outer surface of the core by pressing; and
discharging the particles through the fluid-discharging hole.
13. The method of claim 10 , further comprising, after injecting the resin:
opening a fluid-discharging hole at a position of a deformed portion of the outer surface of the core by pressing; and
discharging the particles through the fluid-discharging hole.
14. The method of claim 1 , further comprising mold clamping pressurization after injecting the resin.
15. The method of claim 14 , further comprising, after injecting the resin:
opening a fluid-discharging hole at a position of a deformed portion of the outer surface of the core by pressing; and
discharging the particles through the fluid-discharging hole.
16. The method of claim 1 , further comprising, after injecting the resin:
opening a fluid-discharging hole at a position of a deformed portion of the outer surface of the core by pressing; and
discharging the particles through the fluid-discharging hole.
17. The method of claim 1 , wherein the pressing member is a piston rod.