Panel's acoustically resistive layer forming method for aircraft, involves forming perforation at level of acoustically resistive layer by contour etching, where perforations are formed under form of microperforations

摘要

#CMT# #/CMT# The method involves forming perforations e.g. holes, at a level of an acoustically resistive layer (10) by contour etching, where the perforations are formed under the form of microperforations (18). A surface of the resistive layer is partially covered with a mask after applying an etching solution to material of the resistive layer on the surface which is at right of non protecting zones by the mask to dissolve the metal and create perforations by an electrochemical process. #CMT# : #/CMT# An independent claim is also included for a method for manufacturing a panel for acoustic treatment at the level of a surface of an aircraft. #CMT#USE : #/CMT# Method for forming an acoustically resistive layer of a panel of a spraying platform for acoustic treatment at the level of a surface of an aircraft (all claimed). #CMT#ADVANTAGE : #/CMT# The method generates the residual stresses during obtaining of the perforations, thus increasing the lifespan of the layer and/or reducing the maintenance operations to reduce the immobilization time of the aircraft and avoid the deformation of the layer. The method allows perforations or microperforations inclined and not normalize to the external surfaces of the layer, thus evacuating the hot air laminated on the level of the external surfaces to treat, and hence decreasing the obstruction risk of the perforations or microperforations caused by the pollution. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows an elevational view of an acoustically resistive layer. 10 : Acoustically resistive layer 12 : Side wall 14 : Opening zones 16 : Complementary zones 18 : Microperforations.