| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing a perforated sheet for the sound absorbing panel of an airplane engine nacelle having accurate perforations adjusted in shape by facilitating the application of a prepreg perforated surface sheet perforated at the time of production of a perforated sheet to a curved surface mold and the shaping thereof by the mold and preventing the perforations of the prepreg perforated surface sheet from being closed by a resin in a prepreg at the time of curing under heating and pressure. SOLUTION: In the method for manufacturing the perforated sheet for the sound absorbing panel of the airplane engine nacelle, a predetermined number of prepreg surface sheets, each of which is prepared by impregnating a reinforcing fiber fabric with a resin hard to flow, are laminated and a large number of perforations are bored in the laminated prepreg surface sheet by punching and, next, the formed laminated prepreg surface sheet is applied to the curved surface mold to be shaped. This shaped prepreg perforated surface sheet is covered with a release film high in elongation and further covered with a back film to be attached to the peripheral edge of the curved surface mold through a seal material. Subsequently, the interior of the back film is evacuated to allow the release film and the back film to comform to the inner surfaces of a large number of perforations of the laminated prepreg perforated surface sheet and, thereafter, the laminated prepreg perforated surface sheet is introduced into an autoclave along with the curved surface mold to be cured under heating and pressure. |
