US 2020/0346409 A1Published application

Method and device for creating a gas stream during the additive manufacturing of a product in a powder bed

AssigneeCommon Sense Engineering and Consult B.V.B.A.

InventorPeter Mercelis

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Abstract

Device and method for the layered manufacture of a three-dimensional product (1) with a recess (3), in which successive powder layers are applied to a building surface (15) above a building platform (4), wherein this building platform (4) extends in a space between a tube wall (6) of a building tube (5) and an insert provided therein (9), wherein a beam of rays (18) is made to impinge on each powder layer and this beam (18) is moved across the powder layer to form successive layers of said product (1) above the building platform (4), so that the insert (9) extends in said recess (3). According to the invention, a gas stream (24) is generated above the building surface (15), extending above said space, wherein it is made sure that this gas stream (24) crosses said beam of rays (18) wherein flue gases formed while the beam of rays (18) strikes said powder layer, are discharged through this gas stream (24).

Device for the layered manufacturing of a three-dimensional product (1) from successive powder layers by means of an additive manufacturing technique,

wherein this product (1) has at least one recess (3),
wherein this device has a building chamber with a building tube (5) and a building platform (4) which can be moved in a vertical direction in relation to each other,
wherein the building platform (4) extends in the building tube (5) with an outer edge (7) connecting to a tube wall (6) of this building tube (5),
wherein a horizontal building surface (15) must extend above the building platform (4) in the building tube (5),
wherein further a powder distributor is provided for applying successive powder layers to said building surface (15), a radiation source for generating an energetic beam of rays (18), and scanning means cooperating with the radiation source to make the beam of rays (18) strike said successive powder layers and move them across these powder layers in order to form successive interconnected layers of said product (1),
wherein at least one insert (9) is provided which extends vertically, at least partially, through a recess (10) in the building platform (4) provided to that end, so that the building platform (4) and the insert (9) can be moved vertically in relation to each other, wherein the insert (9) substantially fits to the interior of the recess (10) in the building platform (4),
characterized in that
this device comprises at least a first gas stream element (19) with at least a first nozzle (20) that opens at the top (13) of the insert (9),
while at least a second gas stream element (22) is provided with at least a second nozzle (23), in order to allow a gas stream (24) to be generated above said building surface (15) between said first gas stream element (19) and said second gas stream element (22) in order to discharge any flue gases, splashes and/or dust particles produced in the course of the manufacture of said product (1).

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Facts

Application

16/750,128Filed 23 Jan 2020

Priority

BE 2019/52912 May 2019

Published

5 Nov 2020

Term ends

Not estimatedThe source records don’t support an estimate.

Classification18 codes

B29C 64/364
Auxiliary operations or equipment: conditioning of environment
B22F 10/28
Direct sintering or melting: powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
B22F 10/322
Of the atmosphere, e.g. composition or pressure in a building chamber: of the gas flow, e.g. rate or direction
B22F 12/17
Auxiliary heating means: to heat the build chamber or platform

Abstract

Claims19