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公开(公告)号：US10821721B2
公开(公告)日：2020-11-03
申请号：US16154444
申请日：2018-10-08
Applicant: Arcam AB
Inventor： Christian Ekberg
IPC: B33Y50/02 , B22F3/105 , B29C64/153 , B29C64/393 , G06F30/00 , B33Y10/00 , B33Y30/00 , B33Y40/00
Abstract: Described is a method for analyzing a build layer (1; 11) in an additive manufacturing machine when forming a three-dimensional article layer by layer by successive fusion of selected areas of powder layers, which selected areas correspond to successive layers of the three-dimensional article. The method comprises the steps of radiating a portion (4; 14) of the build layer (1; 11) by an energy beam and detecting particles emitted, backscattered or reflected from the radiated portion of the build layer, and scanning the portion (4; 14) of the build layer by moving the energy beam along a main path (5; 15) and simultaneously moving the energy beam back-and-forth across the main path in a meandering pattern (6; 16).
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公开(公告)号：US10525547B2
公开(公告)日：2020-01-07
申请号：US15495323
申请日：2017-04-24
Applicant: Arcam AB
Inventor： Christian Ekberg
Abstract: A method is provided for forming a three-dimensional article through successively depositing individual layers of powder material that are fused together so as to form the article, the method comprising the steps of: providing at least one electron beam source emitting an electron beam for at least one of heating or fusing the powder material, where the electron beam source comprises a cathode, an anode, and a Wehnelt cup between the cathode and anode; providing a guard ring between the Wehnelt cup and the anode and in close proximity to the Wehnelt cup, where the guard ring is having an aperture which is larger than an aperture of the Wehnelt cup; protecting the cathode and/or the Wehnelt cup against vacuum arc discharge energy currents when forming the three-dimensional article by providing the guard ring with a higher negative potential than the Wehnelt cup and cathode.
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Patent Agency Ranking
公开(公告)号：US10987752B2
公开(公告)日：2021-04-27
申请号：US15790348
申请日：2017-10-23
Applicant: ARCAM AB
Inventor： Christian Ekberg
IPC: B23K15/00 , B23K15/02 , B28B1/00 , B28B17/00 , B29C64/268 , B33Y10/00 , B33Y50/02 , H01J37/302 , B22F3/105 , B22F7/06 , B23K15/06 , B29C64/153 , B29C64/264 , B33Y30/00 , H01J3/02 , H01J37/06 , H01J37/065 , H01J37/305 , H01J37/315
Abstract: A method is provided for forming a three-dimensional article through successively depositing individual layers of powder material that are fused together so as to form the article. The method includes: providing at least one electron beam source emitting an electron beam; providing a leakage current detector for sensing a current through the anode and/or the Wehnelt cup; providing a low impedance voltage source connectable to the Wehnelt cup via a switch, where the voltage source is having a more negative potential than a negative potential applied to the cathode; and protecting the cathode against vacuum arc discharge energy currents when forming the three-dimensional article by providing the Wehnelt cup to the low impedance negative voltage by closing the switch when the leakage current detector is sensing a current through the anode and/or the Wehnelt cup which is higher than a predetermined value.
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公开(公告)号：US20190193203A1
公开(公告)日：2019-06-27
申请号：US16188453
申请日：2018-11-13
Applicant: ARCAM AB
Inventor： Christian Ekberg , Christer Roennbacke
IPC: B23K26/342 , B33Y30/00 , B33Y50/02 , B23K26/70
CPC classification number: B23K26/342 , B22F2003/1056 , B23K26/703 , B29C64/153 , B29C64/25 , B29C64/255 , B29C64/295 , B29C64/364 , B33Y10/00 , B33Y30/00 , B33Y40/00 , B33Y50/02
Abstract: Provided is an additive manufacturing apparatus (1) for forming a three-dimensional article (2) layer by layer from a powder. The apparatus comprising an outer casing (3) forming a build chamber (4), and a build tank (5) arranged inside the casing in the build chamber. The apparatus (1) further comprises an arrangement (20) for controlling a temperature of the apparatus. The temperature control arrangement (20) comprises at least a first circuit (21) for a first working fluid. The first circuit being arranged at a wall portion (40; 50) of the apparatus for transferring heat between the build chamber (4) and the first working fluid.
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公开(公告)号：US20190160806A1
公开(公告)日：2019-05-30
申请号：US16154444
申请日：2018-10-08
Applicant: Arcam AB
Inventor： Christian Ekberg
Abstract: Described is a method for analyzing a build layer (1; 11) in an additive manufacturing machine when forming a three-dimensional article layer by layer by successive fusion of selected areas of powder layers, which selected areas correspond to successive layers of the three-dimensional article. The method comprises the steps of radiating a portion (4; 14) of the build layer (1; 11) by an energy beam and detecting particles emitted, backscattered or reflected from the radiated portion of the build layer, and scanning the portion (4; 14) of the build layer by moving the energy beam along a main path (5; 15) and simultaneously moving the energy beam back-and-forth across the main path in a meandering pattern (6; 16).
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公开(公告)号：US20180169784A1
公开(公告)日：2018-06-21
申请号：US15790348
申请日：2017-10-23
Applicant: ARCAM AB
Inventor： Christian Ekberg
IPC: B23K15/00 , B28B1/00 , B28B17/00 , B33Y10/00 , B33Y30/00 , B33Y50/02 , H01J37/302 , H01J37/315 , B23K15/02 , B23K15/06
CPC classification number: B23K15/0086 , B22F3/1055 , B23K15/02 , B23K15/06 , B28B1/001 , B28B17/0081 , B29C64/153 , B29C64/268 , B33Y10/00 , B33Y30/00 , B33Y50/02 , H01J3/02 , H01J37/065 , H01J37/302 , H01J37/305 , H01J37/315 , H01J2237/0206
Abstract: A method is provided for forming a three-dimensional article through successively depositing individual layers of powder material that are fused together so as to form the article. The method includes: providing at least one electron beam source emitting an electron beam; providing a leakage current detector for sensing a current through the anode and/or the Wehnelt cup; providing a low impedance voltage source connectable to the Wehnelt cup via a switch, where the voltage source is having a more negative potential than a negative potential applied to the cathode; and protecting the cathode against vacuum arc discharge energy currents when forming the three-dimensional article by providing the Wehnelt cup to the low impedance negative voltage by closing the switch when the leakage current detector is sensing a current through the anode and/or the Wehnelt cup which is higher than a predetermined value.
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公开(公告)号：US20170348791A1
公开(公告)日：2017-12-07
申请号：US15495323
申请日：2017-04-24
Applicant: Arcam AB
Inventor： Christian Ekberg
Abstract: A method is provided for forming a three-dimensional article through successively depositing individual layers of powder material that are fused together so as to form the article, the method comprising the steps of: providing at least one electron beam source emitting an electron beam for at least one of heating or fusing the powder material, where the electron beam source comprises a cathode, an anode, and a Wehnelt cup between the cathode and anode; providing a guard ring between the Wehnelt cup and the anode and in close proximity to the Wehnelt cup, where the guard ring is having an aperture which is larger than an aperture of the Wehnelt cup; protecting the cathode and/or the Wehnelt cup against vacuum arc discharge energy currents when forming the three-dimensional article by providing the guard ring with a higher negative potential than the Wehnelt cup and cathode.
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