公开(公告)号：US20210229354A1

公开(公告)日：2021-07-29

申请号：US17050924

申请日：2019-04-25

Applicant: Freemelt AB

Inventor： Ulf ACKELID

IPC: B29C64/25 ,  B29C64/153

Abstract: The present invention relates to a build compartment used in 3D printing systems based on powder beds. The build compartment is the volume in a 3D printing apparatus where 3D objects are formed by successive consolidation of thin layers of powder. The build compartment is designed with at least two vertical wall structures movable in relation to each other. The movable wall structures are at least partly overlapping in the movable direction, providing self-sealing for a variable volume for enclosing powder. Contrary to other available designs, this solution does not need a compressible sealing material, for example an elastomer, a textile felt or a braided rope, to prevent powder leakage from the build compartment. The advantages are more reliable sealing and no risk of contamination of the powder by debris from sealing material.

公开(公告)号：US20240246298A1

公开(公告)日：2024-07-25

申请号：US18518667

申请日：2023-11-24

Applicant: Freemelt AB

Inventor： Robin STEPHANSEN ,  Ulf ACKELID

IPC: B29C64/393 ,  B29C64/153 ,  B29C64/268 ,  B33Y50/00

CPC classification number: B29C64/393 ,  B29C64/153 ,  B29C64/268 ,  B33Y50/00 ,  B33Y30/00

Abstract: In accordance with one or more embodiments herein, an arrangement for additive manufacturing by selective fusion, using an electron beam, of a three-dimensional product from a powder bed, is provided. The arrangement comprises at least one electron detecting arrangement arranged to detect powder smoke by detecting electrons which have been scattered by the electron beam hitting powder particles which levitate above the powder bed. Also provided is a method for detecting powder smoke during additive manufacturing, the method comprising: arranging at least one electron detecting arrangement in an arrangement for additive manufacturing by selective fusion, using an electron beam, of a three-dimensional product from a powder bed; detecting electrons which have been scattered by the electron beam hitting powder particles which levitate above the powder bed; and determining whether there is powder smoke based on the output from the at least one electron detecting arrangement.

公开(公告)号：US20230150201A1

公开(公告)日：2023-05-18

申请号：US17918294

申请日：2021-04-16

Applicant: Freemelt AB

Inventor： Ulf ACKELID

IPC: B29C64/295 ,  B29C64/153 ,  B33Y10/00 ,  B33Y30/00 ,  B33Y40/10 ,  B22F12/13 ,  B22F10/28

CPC classification number: B29C64/295 ,  B29C64/153 ,  B33Y10/00 ,  B33Y30/00 ,  B33Y40/10 ,  B22F12/13 ,  B22F10/28

Abstract: An arrangement for additive manufacturing by selective fusion of layers of a three-dimensional product from a powder bed including successively formed powder layers is provided. The arrangement includes a heating element having a powder layer facing surface, arranged in a powder layer heating position above a powder layer, in such a way that heat radiation emitted from said heating element heats at least a part of the powder layer before the selective fusion of a layer of the three-dimensional product from the powder layer.

公开(公告)号：US20210162668A1

公开(公告)日：2021-06-03

申请号：US17257100

申请日：2019-07-03

Applicant: Freemelt AB

Inventor： Ulf ACKELID

IPC: B29C64/255 ,  B22F12/50 ,  B33Y30/00 ,  B29C64/35

Abstract: Three-dimensional (3D) printing systems based on powder beds, in which 3D objects are formed by successive consolidation of thin layers of powder are disclosed. The powder compartment from which powder feedstock is distributed in a 3D printer has at least two vertical wall structures movable in relation to each other, the wall structures being at least partly overlapping in the movable direction, providing a variable volume for enclosing powder. Contrary to other available designs, this solution does not need a compressible sealing material, for example an elastomer, a textile felt or a braided rope, to prevent powder leakage from the powder compartment. The benefits are a simple and robust design providing more reliable sealing and no risk of contamination of the powder by debris from sealing material.