| 主权项 |
1. A method of manufacturing a body made of composite material with thermoplastic matrix provided with an inner cavity with an outward opening, said cavity comprising at least one concave curved wall and the outward opening having a smaller dimension than the maximum width of the inner cavity between two opposite walls, characterized in that it comprises:
a first step of cutting fabrics preimpregnated with thermoplastic resin into portions according to a pattern of the body to be manufactured, wherein at least some of said preimpregnated fabrics are LFRTP-type fabrics, reinforced with long woven or non-woven fibers; a second step of placing the portions of preimpregnated fabrics in a mold provided with an inlet in the closed position, divided into at least two facing half-molds the closure of which configures a female type cavity reproducing the negative geometry of the body, arranging the portions of preimpregnated fabrics superposed on one another in multiple layers forming a multilayer structure, firstly positioning the portions that will constitute the outer layer of the body to be manufactured on the walls of the cavity of the mold and lastly the portions that will constitute the inner layer, the outer layer being formed by at least one stratum of portions of veil type or felt type fabrics, containing non-woven and non-oriented fibers of lengths comprised between 5 and 20 mm; a third step of placing a head provided with a bag configured as a male component with respect to the mold, closing the inlet of the mold, the bag being located inside the cavity of the mold; a fourth step of applying pressure inside the bag causing the bag to inflate and expand to such a volume causing the contact and pressure of the surface of the bag against the portions of fabrics arranged on the walls of the cavity of the mold and the thrust thereof against the walls of the mold; a fifth step, simultaneous to the fourth step, of applying heat on the half-molds starting from a room temperature to an operating temperature value such that it causes the melting of the thermoplastic resin present in the fabrics and its flow to reproduce the geometry of the mold; a sixth step of cooling the half-molds to a temperature such that it allows extracting the solidified molded body from the mold without becoming deformed; a seventh step of depressurizing the bag until at least achieving that such bag no longer contacts the walls of the cavity of the mold; an eighth step of withdrawing the head from the inlet of the mold whereby the bag is extracted from inside the cavity of the mold; a ninth step of opening the mold by separating the at least two half-molds from one another; and a tenth step of extracting the molded body. |
