Abstract: An assembled mandrel for forming a hollow structure having a shape similar to that of the assembled mandrel, by layering a prepreg on the surface of the longitudinally oriented assembled mandrel, covering the same with a vacuum bag, heating while creating a vacuum inside the vacuum bag, and heat-curing the prepreg while pressing the same into the assembled mandrel, the assembled mandrel being characterized by being equipped with: two outer mandrel members (first mandrel members) extending in the longitudinal direction; a center mandrel member (second mandrel member) sandwiched between the two outer mandrel members, and capable of being withdrawn in the lengthwise direction from between the two outer mandrel members after the hollow structure has been formed; and a tape (detachable member) formed from a low-friction material and adhered to one or more of the contact surfaces between the two outer mandrel members and the center mandrel member.

Abstract: A composite material structure forming method capable of improving the shape and dimensional accuracy inside a composite material structure. The method includes: winding a prepreg (2) around an inner jig (6); stacking a ply (8) on the prepreg (2) wound around the inner jig (6); and forming a composite material structure by providing composite outer plates (4a, 4b) on an outer periphery of the inner jig (6) on which the ply (8) is stacked and mounting divided outer jigs (9) thereon.

Abstract: An assembled mandrel for forming a hollow structure having a shape similar to that of the assembled mandrel, by layering a prepreg on the surface of the longitudinally oriented assembled mandrel, covering the same with a vacuum bag, heating while creating a vacuum inside the vacuum bag, and heat-curing the prepreg while pressing the same into the assembled mandrel, the assembled mandrel being characterized by being equipped with: two outer mandrel members (first mandrel members) extending in the longitudinal direction; a center mandrel member (second mandrel member) sandwiched between the two outer mandrel members, and capable of being withdrawn in the lengthwise direction from between the two outer mandrel members after the hollow structure has been formed; and a tape (detachable member) formed from a low-friction material and adhered to one or more of the contact surfaces between the two outer mandrel members and the center mandrel member.

Abstract: A fabrication method and a fabrication device capable of fabricating medium-scale mass production parts. The method of fabricating a composite material hollow part includes: holding a tool on a frame using a holding section that maintains a gap between the tool and the frame, placing a prepreg on the tool, covering the tool and the prepreg using a highly stretchable sheet, securing the highly stretchable sheet and the frame with a securing jig so that tension is applied to the highly stretchable sheet from the top portion of the prepreg where the highly stretchable sheet contacts the prepreg at the highly stretchable sheet and the outer periphery of both the tool and the prepreg to the edges of the highly stretchable sheet, thereby forming an enclosed space that houses the tool and the prepreg, and subsequently evacuating the inside of the enclosed space to wrap the prepreg around the tool.

Abstract: A method for manufacturing a resin-based composite material includes: a stage in which prepregs are stacked on a jig; a stage in which the stacked prepregs and the jig are covered and pressurized heat treatment is applied thereto to form a first semi-molded article and a second semi-molded article; a stage in which board thicknesses of the first semi-molded article and the second semi-molded article are measured, a stage in which the number of additional plies is determined based on the measured board thicknesses, a desired board thickness of the resin-based composite material, and physical properties of the additional plies; and a stage in which a layered product is formed by stacking the predetermined number of additional plies between the first semi-molded article and the second semi-molded article, the layered product and the jig are covered with a bagging material, and pressurized heat treatment is applied thereto.

Abstract: A fabrication method and a fabrication device capable of fabricating medium-scale mass production parts. The method of fabricating a composite material hollow part includes: holding a tool on a frame using a holding section that maintains a gap between the tool and the frame, placing a prepreg on the tool, covering the tool and the prepreg using a highly stretchable sheet, securing the highly stretchable sheet and the frame with a securing jig so that tension is applied to the highly stretchable sheet from the top portion of the prepreg where the highly stretchable sheet contacts the prepreg at the highly stretchable sheet and the outer periphery of both the tool and the prepreg to the edges of the highly stretchable sheet, thereby forming an enclosed space that houses the tool and the prepreg, and subsequently evacuating the inside of the enclosed space to wrap the prepreg around the tool.

Abstract: Provided is a composite material structure forming method capable of improving the shape and dimension accuracy inside a composite material structure. The method includes: winding a prepreg (2) around an inner jig (6); stacking a ply (8) on the prepreg (2) wound around the inner jig (6); and forming a composite material structure by providing composite outer plates (4a, 4b) on an outer periphery of the inner jig (6) stacking the ply (8) and mounting divided outer jigs (9) thereon.

Abstract: A method for manufacturing a resin-based composite material includes: a stage in which prepregs are stacked on a jig; a stage in which the stacked prepregs and the jig are covered and pressurized heat treatment is applied thereto to form a first semi-molded article and a second semi-molded article; a stage in which board thicknesses of the first semi-molded article and the second semi-molded article are measured, a stage in which the number of additional plies is determined based on the measured board thicknesses, a desired board thickness of the resin-based composite material, and physical properties of the additional plies; and a stage in which a layered product is formed by stacking the predetermined number of additional plies between the first semi-molded article and the second semi-molded article, the layered product and the jig are covered with a bagging material, and pressurized heat treatment is applied thereto.