PROCESS AND APPARATUS FOR FORMING A SEMI-SOLID THIXOTROPIC METAL MASS WITHIN THE MOLD IN WHICH THE METAL IS CAST

摘要

P THE PRESENT INVENTION CONCERNS A PROCESS FOR CASTING A METAL MOLD OR A SHELL OF A METAL OR MOLTEN ALLOY, ACCORDING TO WHICH THE METAL IS COOLED UNDER CONTROLLED CONDITIONS WHILE IT IS MOLDED BY MAGNETOMOTRIC FORCES DUE TO A FIELD OF D 'VARIABLE MAGNETIC INDUCTION, AND APPARATUS FOR IMPLEMENTING THIS PROCESS. /P P A NON-ZERO MAGNETIC FIELD EVERY POINT OF THE VOLUME DETERMINED BY THE FRONT OF SOLIDIFICATION 35 OF THE METAL IN THE MOLD 11 IS CREATED BY A STATOR 27 OF A BIPOLAR INDUCTION MOTOR THAT IS MOUNTED AROUND THE MOLD UNDER THE COOLING SYSTEM 20. SUCH A FIELD CREATES SHEAR FORCES THAT REDUCE THE GROWTH AND BINDING OF THE PRIMARY DENDRITES OF SOLID PHASES TO FORM A VERY FINE GRAIN STRUCTURE SUSPENDED IN A LIQUID MATRIX, CALLED "THIXOTROPE" STRUCTURE, UNTIL THE SOLIDIFICATION FRONT 35. /P P THE INVENTION APPLIES IN PARTICULAR TO CONTINUOUS OR SEMI-CONTINUOUS CASTING OF ALL METALS OR ALLOYS. / P