Method of manufacturing “T” shaped stringers for an aircraft and curing tool used thereof

摘要

A method of manufacturing “T” shaped stringers for an aircraft whereby the “T” shaped stringers have a stringer web and a stringer foot, the method comprising: a first step of hot-forming a carbon fiber laminate in order to achieve semi-stringers with an “L” shaped cross-section, a second step of placing together two hot-formed “L” shaped semi-stringers in order to form a “T” shaped stringer, a third step of co-bonding the resulting “T” shaped stringer on a cured skin with an adhesive line between them, and a fourth step of curing the obtained “T” shaped stringer inside a vacuum bag using invar alloy angles as curing tools. The invar alloy angles are cut at a radius area eliminating a part of the invar alloy angles covering the stringer foot in order to define an invar alloy piece having no foot.

主权项

1. A method of manufacturing a “T” shaped stringer for an aircraft, the method comprising:
hot-forming a carbon fiber laminate in order to achieve semi-stringers (4), each with an “L” shaped cross section, placing together two of the hot-formed “L” shaped semi-stringers (4) in order to form the “T” shaped stringer (1) such that the “T” shaped stringer (1) has a stringer foot (3) and a stringer web (2) projecting from the stringer foot (3) with union vertexes defined between the stringer foot (3) and the stringer web (2), co-bonding the “T” shaped stringer (4) on a cured skin (5) with an adhesive line (6) between the “T” shaped stringer (4) and the cured skin (5), arranging invar alloy angles (7) on the stringer web (2) of the “T” shaped stringer (4), and cutting the invar alloy angles (7) along lines extending from the union vertexes, so as to eliminate parts of the invar alloy angles (7) covering the stringer foot (3) and define invar alloy pieces (7′, 7″) covering an entire length of the stringer web (2) but having no foot, and after said cutting of the invar alloy angles (7), curing the “T” shaped stringer (1) inside a vacuum bag using the invar alloy pieces (7′, 7″) as curing tools.