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    THREE DIMENSIONAL PRINTING
    72.
    发明申请
    THREE DIMENSIONAL PRINTING 审中-公开

    公开(公告)号：US20190105831A1

    公开(公告)日：2019-04-11

    申请号：US16031564

    申请日：2018-07-10

    申请人： MARKFORGED, INC.

    发明人： Gregory Thomas Mark ,  Antoni S. Gozdz

    IPC分类号： B29C64/106 ,  B29C70/20 ,  B29C64/393

    摘要： Various embodiments related to three dimensional printers, and reinforced filaments, and their methods of use are described. In one embodiment, a void free reinforced filament is fed into an conduit nozzle. The reinforced filament includes a core, which may be continuous or semi-continuous, and a matrix material surrounding the core. The reinforced filament is heated to a temperature greater than a melting temperature of the matrix material and less than a melting temperature of the core prior to drag the filament from the conduit nozzle.

    3D PRINTING INTERNAL FREE SPACE
    73.
    发明申请
    3D PRINTING INTERNAL FREE SPACE 审中-公开

    公开(公告)号：US20190047047A1

    公开(公告)日：2019-02-14

    申请号：US16165291

    申请日：2018-10-19

    申请人： MARKFORGED, INC.

    发明人： Gregory Thomas Mark

    IPC分类号： B22F3/00 ,  B22F1/00 ,  B33Y70/00 ,  B22F3/10 ,  B33Y10/00

    摘要： For 3D printing green parts to be debound and sintered, a binder may be jetted into successive layers of sinterable powder feedstock to build up a 3D shape of a desired 3D green part, associated sintering supports, and an associated shrinking platform. A release material may be deposited to intervene between the 3D green parts and the sintering supports. A placeholder material may be deposited upon bound powder to form 2D layer shapes of placeholder material, and the sinterable powder feedstock refilled and leveled about the placeholder material. Upon debinding, internal cavities corresponding to the 3D shapes of the placeholder material are formed.

    SINTERING ADDITIVELY MANUFACTURED PARTS IN MICROWAVE OVEN
    74.
    发明申请
    SINTERING ADDITIVELY MANUFACTURED PARTS IN MICROWAVE OVEN 审中-公开

    公开(公告)号：US20190030601A1

    公开(公告)日：2019-01-31

    申请号：US15961372

    申请日：2018-04-24

    申请人： MARKFORGED, INC.

    发明人： Gregory Thomas Mark

    IPC分类号： B22F3/00 ,  B33Y70/00 ,  B22F1/00 ,  B33Y10/00 ,  B22F3/10

    摘要： A method comprising supplying a first material containing a removable binder and greater than 50% volume fraction of a powdered metal having a melting point greater than 1200 degrees C., in which more than 50% of powder particles of the powdered metal have a diameter less than 10 microns, additively depositing the first material in successive layers to form a green body, removing the binder to form a brown body, loading the brown part into a fused tube formed from a second material having an operating temperature less than substantially 1200 degrees C., a thermal expansion coefficient lower than 1×10-6/° C., and a microwave field penetration depth of 10 m or higher, sealing the fused tube and replacing internal air with a sintering atmosphere, applying microwave energy from outside the sealed fused tube to the brown part, and sintering the brown part at a temperature lower than 1200 degrees C.