FIELD: composite materials.
SUBSTANCE: invention relates to a method for the production of a converted dry preliminary workpiece, a converted dry preliminary workpiece obtained by the specified method, and to a method for the production of a product made of composite materials, using the specified converted dry preliminary workpiece. The method includes a sequence of following stages: simultaneous knitting of a weft/loop column using at least one sewing thread and a set of unidirectional threads of a reinforcing element, while the mentioned at least one sewing thread contains material, a nature of which differs from a nature of material contained in the mentioned set of unidirectional threads of the reinforcing element, and the mentioned set of unidirectional threads of reinforcing material contains at least one thread containing or consisting of thermoplastic material and at least one thread containing or consisting of reinforcing material, wherein the mentioned thermoplastic material is characterized by a melting point lower than a melting point of the mentioned reinforcing material, creation of a three-dimensional knitted product that constitutes a transformable dry preliminary workpiece having a shape of the resulting product. The method for the production of a product includes a sequence of the following stages: the location of the said converted dry preform in place on the model having the contour of the resulting product, heating to at least the lowest melting point in such a way as to impregnate and/or coat the said reinforcing material with the help of the said thermoplastic material, while the said thermoplastic material is converted as a result of melting, and cooling of the product obtained in this way.
EFFECT: possibility of creation of a three-dimensional product made of composite materials, directly and when creating one knitted product, ensuring the continuity of threads throughout the resulting knitted product.
8 cl, 2 ex
