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公开(公告)号：US20210050174A1
公开(公告)日：2021-02-18
申请号：US17040687
申请日：2019-03-22
Applicant: Freemelt AB
Inventor： Ulric LJUNGBLAD , Robin STEPHANSEN
IPC: H01J37/065 , H01J37/32 , H01J29/04
Abstract: A cathode assembly for emitting charged particles, used in for example an electron gun as source for generating an electron beam is provided. The cathode assembly has a cathode including an emitting member and a carrier. The emitting member is mounted in the carrier, and the carrier is electrically connected to a holder. The cathode is heated by irradiation from an external source, whereby the emitting member emits charged particles from an emitting surface at an emitting temperature. The connection between the carrier and the holder provides a thermal barrier for reducing the amount of thermal energy transferred from the cathode to the holder.
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公开(公告)号：US20240363303A1
公开(公告)日：2024-10-31
申请号：US18768126
申请日：2024-07-10
Applicant: Freemelt AB
Inventor： Ulric LJUNGBLAD , Robin STEPHANSEN
IPC: H01J37/065 , H01J29/04 , H01J37/32
CPC classification number: H01J37/065 , H01J29/04 , H01J37/32724
Abstract: A cathode assembly for emitting charged particles, used in for example an electron gun as source for generating an electron beam. The cathode assembly has a cathode comprising an emitting member and a carrier. The emitting member is mounted in the carrier, and the carrier is electrically connected to a holder. The cathode is heated by irradiation from an external source, whereby the emitting member emits charged particles from an emitting surface at an emitting temperature. The connection between the carrier and the holder provides a thermal barrier for reducing the amount of thermal energy transferred from the cathode to the holder.
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公开(公告)号：US20230330751A1
公开(公告)日：2023-10-19
申请号：US17761864
申请日：2020-09-23
Applicant: Freemelt AB
Inventor： Ulric LJUNGBLAD , Robin STEPHANSEN
IPC: B33Y30/00 , H01J37/075 , B22F12/41 , H01J37/305
CPC classification number: B22F12/41 , B33Y30/00 , H01J37/075 , H01J37/305
Abstract: A metal 3D printer, a cathode holder system, a carrier for an electron emitter, and an electron source piece with a thermal break in a mechanical interface are provided. The metal 3D printer has an electron gun adapted to direct an electron beam generated by a back heated electron emitter of a cathode arrangement onto a metal material via an anode arrangement. The back heated electron emitter is capable of emitting electrons via thermionic emission from an emitting surface when heated on a back surface, and includes a side surface, essentially perpendicular to the emitting surface, between the emitting surface and the back surface. The metal 3D printer 100 includes: an electron source piece, including the electron emitter attached to a carrier in such a way that the carrier covers the side surface of the electron emitter adjoining the emitting surface; a cathode holder system including one or more cathode holder system members adapted to hold the electron source piece in a position in relation to an anode arrangement; and a first thermal break in a first mechanical interface adapted to mate an emitter holder of the cathode holder system with the electron source piece.
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Patent Agency Ranking
公开(公告)号：US20210233731A1
公开(公告)日：2021-07-29
申请号：US17053447
申请日：2019-05-09
Applicant: Freemelt AB
Inventor： Robin STEPHANSEN , Fredrik SELMOSSON
Abstract: The present invention relates to a circuit arrangement comprising an analogue amplifier electrically connected to a first end of an inductive load. Further at least one electrical switch is electrically connected to a second end of the inductive load, where the electrical switch increases the rate of current change in the inductive load by applying an electrical voltage potential to the second end of the inductive load. The voltage at the second end can also be switched by a digital circuit at the second end for improved performance The inductive load may e.g. be a beam control coil, which may be provided for controlling an electron beam, e.g. in an electron gun.
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公开(公告)号：US20210129438A1
公开(公告)日：2021-05-06
申请号：US17041491
申请日：2019-03-26
Applicant: FREEMELT AB
Inventor： Robin STEPHANSEN
Abstract: The present invention relates to a method for removing powder from a component or part produced by a powder bed additive manufacturing system. The method comprises the steps; providing a part, the part having at least one internal cavity with at least one external opening, the at least one cavity being at least partly filled with powder grains, the powder grains being connected to each other and to the walls of the cavity by mechanical, frictional, electrical, physical or chemical forces; adding medium in liquid phase to the at least one cavity of the part, the liquid having the property that it expands in phase transition from liquid to solid phase; transforming added medium to solid phase to loosen and break up at least a fraction of the powder grains connections from each other; and removing powder from the at least one internal cavity.
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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.
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公开(公告)号：US20220184893A1
公开(公告)日：2022-06-16
申请号：US17689379
申请日：2022-03-08
Applicant: Freemelt AB
Inventor： Robin STEPHANSEN
Abstract: A method for removing powder from a component or part produced by a powder bed additive manufacturing system is provided. The method includes providing a part, the part having at least one internal cavity with at least one external opening, the at least one cavity being at least partly filled with powder grains, the powder grains being connected to each other and to the walls of the cavity by mechanical, frictional, electrical, physical, or chemical forces. The method further includes adding medium in liquid phase to the at least one cavity of the part, the liquid having the property that it expands in phase transition from liquid to solid phase; transforming added medium to solid phase to loosen and break up at least a fraction of the powder grains connections from each other; and removing powder from the at least one internal cavity.
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公开(公告)号：US20210010150A1
公开(公告)日：2021-01-14
申请号：US17041475
申请日：2019-03-26
Applicant: Freemelt AB
Inventor： Martin WILDHEIM , Robin STEPHANSEN
Abstract: A method for removing powder from a component or part produced by metal additive manufacturing systems based on powder beds. The method includes manufacturing a part by additive manufacturing, the part having at least one internal cavity with at least one external opening. The internal cavity is at least partly filled with powder, the powder in the internal cavity having grains agglomerated or connected to each other. The method further including: evacuating gas from the internal cavity; adding liquid electrolyte to the internal cavity, and using an electrochemical process for separating connected powder grains in the cavity.
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