Method for manufacturing a structural and/or acoustic panel for a nacelle of an aircraft propulsion unit, and corresponding device

A method for manufacturing a structural and/or acoustic panel for a nacelle of an aircraft propulsion unit, the structural and/or acoustic panel comprising two metallic skins and a metallic cellular structure, the method comprising an arrangement of one of the two metallic skins, called a working skin, such that the working skin delimits a first volume and a second volume of an enclosure, and an arrangement of the metallic cellular structure within the second volume of the enclosure, wherein the method further comprises:

• placing the working skin, which is not deformed at all, by pinching between pinch areas of the enclosure;
• applying a gas pressure in the first volume of the enclosure so as to press and hold the working skin against the metallic cellular structure;
• deforming the working skin in the enclosure by heating the working skin with electromagnetic radiation when the first volume of the enclosure is pressurized by a gas such that the working skin is deformed into a shape conforming to a shape of the metallic cellular structure, the heating by the electromagnetic radiation during the deforming being carried out by selectively heating the working skin from ends up to a center of the working skin so as to uniformize deformation of the working skin;
• and
• heating the working skin by infrared electromagnetic radiation by a first heating device placed in the first volume of the enclosure so as to assemble the working skin to the metallic cellular structure by at least one of brazing and diffusion-welding.