Method for manufacturing an acoustic panel

A process for manufacturing a composite panel, comprising:

• obtaining a first wall, a second wall, a third wall and a fourth wall each formed of composite materials comprising an oxide matrix and long oxide fibers, the long oxide fibers being several kilometers long;
• from the first and second walls, forming a honeycomb core having a plurality of cells, each cell having a first end and an opposite second end, the forming comprising:
• forming the first wall so as to obtain a corrugated wall having alternating first and second apex portions interconnected by apex connecting portions;
• and
• cutting slots in said first apex portions and in said apex connecting portions of the first wall;
• making cuts in the second wall so as to obtain a plurality of strips;
• and
• inserting said strips into the slots of the first wall so as to delimit the plurality of cells, wherein the slots are cut in a substantially axial direction and opening in a direction normal to the corrugated wall;
• and
• covering said first and second ends of the cells of said honeycomb core with said third wall and said fourth wall, respectively, so as to close the ends of said cells.