Laser operating machine for additive manufacturing by laser thermal treatment, in particular by fusion, and corresponding method

Abstract

A laser operating machine for additive manufacture of objects, via a process of laser thermal treatment of metal powders, in particular via fusion, comprising a movement structure (), which is mobile in a working space () that comprises a working surface (), said machine operating according to a first cartesian system of axes of movement (X, Y, Z) and being configured for supporting a moving element () comprising one or more nozzles () for emitting jets of powder to be treated thermally onto a working substrate (), and an optical laser assembly () for conveying a laser beam (L) to form a laser spot (S) focused on said working substrate () in order to carry out thermal treatment of said powders. According to the invention, said moving element () comprises: an upper portion () associated in a fixed way to said movement structure (), said optical laser assembly () being set in said upper portion (); and a lower portion (), set in which is a tool-carrier frame (), arranged on which are said one or more nozzles () for emitting jets of powder, and in that said nozzles () are arranged on said frame () so that longitudinal axes (U) thereof form an angle of inclination (β) with respect to said vertical axis (I) such that jets (PJ) of said nozzles () intersect in a powder-deposition point (PD), said machine () comprising actuator means for varying said angle of inclination (β) of said longitudinal axes (U) of said one or more nozzles (); said optical laser assembly () being set in the moving element () so as to send the laser beam (L) onto the working surface () passing within perimeter defined by said plurality of nozzles () emitting jets of powder.