process for manufacturing an unworked aluminum alloy semi-finished product such as a rolling plate or an extrusion billet, and installation for direct cooling vertical semi-continuous casting

摘要

Patent Specification: "Improved microporosity aluminum alloy semi-product and manufacturing process". The present invention relates to a manufacturing process, which allows to obtain a non-corroded semi-product having a half-thickness of a micropore density of greater than 90 µm less than 50% and preferably less than 20% of a density. micropores larger than 90 µm obtained by a prior art process. The process according to the invention comprises, notably, a step of ultrasound treatment of liquid metal bath in an oven and / or a bowl with the aid of an immersed device comprising at least one ultrasound emitter. The semi-products obtained by the process according to the invention are particularly advantageous for the lamination manufacture of sheets intended for the aeronautical industry for the manufacture of stringers, ribs, soffits and extractions and for the spinning of sections for aeronautical industry for making stiffeners.