Method of producing metal mould cavities be means of ceramic and metal power sintering

Method for producing at least a part of a metal mould cavity by sintering a metal powder, or a mixture of metal powders, from at least a part of a three-dimensional template, or master pattern, positioned in a casting frame, into which a metal powder, or a mixture of metal powders, is poured, before sintering in a furnace, said sintering being followed by the removal of said part of the template so as to free a volume forming at least a part of a cavity intended for moulding a piece, characterized in that said method comprises steps consisting in:

• a) selecting a ceramic powder, or a mixture of ceramic powders, and a metal powder, or a mixture of metal powders, as a function of the production parameters;
• b) depositing a homogeneous layer (1) of small thickness of the ceramic powder selected, or of the mixture of ceramic powders selected, on a support (6) of a sintering device in solid phase with the aid of a laser;
• c) effecting a sintering of said layer (1) of ceramic powder, or of the mixture of ceramic powders, without binding agent nor fluid, in pre-established laser scanning paths;
• d) repeating steps b) then c) until the desired shape and dimensions of at least a part (7, 8) of the template are obtained;
• e) positioning at least a part (7, 8) of the template, without retouching or treatment later than step d), in at least one casting frame (9, 10) in which a metal powder, or a mixture of metal powders, selected in step a) is poured, with a view to sintering thereof.