METHOD OF PRODUCING INTEGRATED STRINGER PANEL Russian patent published in 2017 - IPC B32B3/12 

FIELD: technological processes.

SUBSTANCE: method comprises forming a prepreg sheet lagging, producing a system of stringer preforms from other prepreg sheets, connecting a system of stringer preforms with a lagging, followed by forming an integrated stringer panel. System of stringer preforms is made of a solid prepreg sheet by folding. Transformable mandrel is laid in a flat state on a prepreg sheet designed for producing the system of stringer preforms. The prepreg sheet with the transformable mandrel are placed in a vacuum bag, where vacuum is produced for pressing the prepreg to the transformable mandrel and folding the transformable mandrel with the prepreg to the end position with the formation of a given system of the stringer preforms. After removal of the vacuum bag, the system of stringer preforms with transformable mandrel are laid by the flat side on the prepreg sheets, constituting the mandrel, and themolding process is carried out to form an integrated stringer panel, and then the transformable mandrel is removed.

EFFECT: reduced labor intensivity of structure production due to elimination of the pattern cutting operations during the preparation of stringer preforms while increasing the strength of the integrated stringer panel due to the increased strength of the stringer connection with the mandrel by forming a stringer system from a solid sheet of reinforcing material without violating its integrity.

8 dwg