Abstract: Apparatus for additive manufacturing includes:—a platform adapted to receive a powder bed that is laid thereon; —a laser source adapted to emit a laser beam towards the powder bed; —a first doctor blade and a second doctor blade opposite to the first doctor blade and located at a predetermined distance from said first doctor blade, the doctor blades being adapted to move in the same direction (X), so as to slide along the whole platform and define a work area, into which the laser beam is directed in order to manufacture a product; wherein the powder bed (102) is laid out by the first doctor blade, and the first doctor blade is provided with an emission opening adapted to produce a blade of a predetermined gas directed towards the powder bed, and the second doctor blade is provided with a suction opening for sucking in the gas when the product is complete, the suction opening being provided with a sensor adapted to measure the turbulence of the gas flow in the work area, so as to maintain, through a control u

Abstract: Doctor blade for an apparatus for additive manufacturing, adapted to move transversally on a platform housing a powder bed, in a direction parallel to the plane in which the powder bed lies, wherein the doctor blade is provided with at least one illuminator arranged in the lower part of the doctor blade itself, the at least one illuminator being an emitter with an emission spectrum centered in the spectral region from 300 to 1000 nm.

Abstract: Apparatus for additive manufacturing includes:—a platform adapted to receive a powder bed that is laid thereon;—a laser source adapted to emit a laser beam towards the powder bed;—a first doctor blade and a second doctor blade opposite to the first doctor blade and located at a predetermined distance from said first doctor blade, the doctor blades being adapted to move in the same direction (X), so as to slide along the whole platform and define a work area, into which the laser beam is directed in order to manufacture a product; wherein the powder bed (102) is laid out by the first doctor blade, and the first doctor blade is provided with an emission opening adapted to produce a blade of a predetermined gas directed towards the powder bed, and the second doctor blade is provided with a suction opening for sucking in the gas when the product is complete, the suction opening being provided with a sensor adapted to measure the turbulence of the gas flow in the work area, so as to maintain, through a control uni

Abstract: Apparatus for additive manufacturing includes: a platform adapted to receive a powder bed that is laid thereon; a laser source adapted to emit a laser beam towards the powder bed; a doctor blade adapted to move transversally relative to the platform in a direction parallel to the plane in which the powder bed lies, thereby moving the powder towards a work area, in which the laser beam progressively manufactures a product by sintering the layer of powder just deposited by the doctor blade; wherein the doctor blade is provided with at least one illuminator arranged in the lower part of the doctor blade itself, the at least one illuminator being an emitter with an emission range centered in the spectral region from 300 to 1000 nm.

Abstract: A powder dispenser (14) has a vertical channel (55), which, at the top, is adapted to communicate with a tank for receiving the powder and inferiorly ends at an opening (26), which is elongated along a horizontal direction and comprises an outlet portion (51) for letting the powder fall; the dispenser further has a shutter device (50) for varying the length of the outlet portion (51) with respect to the total length of the opening (26) along its horizontal axis (36).

Abstract: According to a process for manufacturing a piece having a relatively big size, in particular a blade for a turbine engine, at least two sectors are manufactured separately from each another, so that each of them comprises: a portion having substantially the same shape and size of a corresponding portion of the piece to be made, at least one coupling surface which is complementary to a corresponding coupling surface of the other sector, and a continuous outer flange at each of said coupling surfaces; the sectors are rested against each other at the coupling surfaces and are then fastened to each other by means of an electron beam welding, carried out under vacuum, so as to weld the outer flanges along the entire outer perimeter of the coupling surfaces, and by means of a subsequent hot isostatic compression; after the fastening, the flanges are removed by means of a material removal machining.

Abstract: A component is formed by means of additive manufacturing by repeating a series of cycles, where each cycle has a depositing step for forming a powder layer of substantially constant thickness; a pre-heating step, for pre-heating the powder layer; and a melting step, for melting some areas of said powder layer by means of an energy beam so as to form a horizontal section of the component that must be obtained; at the end of all cycles, the top surface of the horizontal section that has been formed is lowered until it reaches a predetermined height; the pre-heating step is performed by moving a heat source above the powder layer at the same time as the depositing step, at least for an initial part of the pre-heating step.

Abstract: A powder dispenser (14) has a vertical channel (55), which, at the top, is adapted to communicate with a tank for receiving the powder and inferiorly ends at an opening (26), which is elongated along a horizontal direction and comprises an outlet portion (51) for letting the powder fall; the dispenser further has a shutter device (50) for varying the length of the outlet portion (51) with respect to the total length of the opening (26) along its horizontal axis (36).

Abstract: Method and plant for simultaneously coating internal and external surfaces of a metal item, whereby a gaseous mixture comprising a coating agent is fed towards the external surfaces of the metal item to be coated and towards each of the inlets of the internal passages or pipes of said metal item; simultaneously, in a continuous or pulsating way, a gaseous flow different from the entraining gaseous mixture being introduced into the internal passages to generate a current for entraining the gaseous mixture within the internal passages themselves.