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    TOOL PATH OPTIMIZATION METHOD FOR MINIMIZING THERMAL UNBALANCE IN METAL 3D PRINTING
    12.
    发明公开
    TOOL PATH OPTIMIZATION METHOD FOR MINIMIZING THERMAL UNBALANCE IN METAL 3D PRINTING 审中-公开

    公开(公告)号：US20230249257A1

    公开(公告)日：2023-08-10

    申请号：US17623146

    申请日：2021-11-03

    Applicant: Korea Electronics Technology Institute

    Inventor： Hwa Seon SHIN ,  Sung Hwan CHUN ,  Hye In LEE ,  Sung Hun PARK

    IPC: B22F10/85 ,  B22F10/368 ,  B22F10/366 ,  B22F12/90 ,  B22F10/28

    CPC classification number: B22F10/85 ,  B22F10/368 ,  B22F10/366 ,  B22F12/90 ,  B22F10/28

    Abstract: Provided is a tool path optimization method for minimizing thermal unbalance in metal 3D printing. The tool path optimization method according to an embodiment of the present disclosure includes: a slicing step of generating stratum data by slicing a 3D model; a tool path data generation step of generating tool path data including a moving path of a tool which is moved inside a stratum, by applying equipment settings to the generated stratum data; a thermal data generation step of generating thermal data A of a first stratum and thermal data B1, B2, B3 of three lower layers of the first stratum, based on the tool path data; a thermal data analysis step of generating a thermal data contour by combining the thermal data A, B1, B2, B3; a thermal data application step of identifying an area where thermal unbalance is concentrated based on the thermal data contour, and setting an identification area D; and a tool path optimization step of optimizing a tool path for the identification area D. Accordingly, by correcting and regenerating a tool path to minimize thermal unbalance, based on thermal data which is a result of simulating thermal unbalance occurring when metal additive manufacturing is performed, costs incurred in current metal 3D printing manufacturing sites may be saved.

    METHOD FOR GENERATING HOLLOW STRUCTURE BASED ON 2D LAMINATED CROSS-SECTIONAL OUTLINE FOR 3D PRINTING
    13.
    发明申请
    METHOD FOR GENERATING HOLLOW STRUCTURE BASED ON 2D LAMINATED CROSS-SECTIONAL OUTLINE FOR 3D PRINTING 有权

    公开(公告)号：US20220262071A1

    公开(公告)日：2022-08-18

    申请号：US17623104

    申请日：2020-11-10

    Applicant: Korea Electronics Technology Institute

    Inventor： Hye In LEE ,  Hwa Seon SHIN ,  Sung Hwan CHUN ,  Sung Hun PARK ,  Ji Min JANG

    IPC: G06T17/20

    Abstract: Provided is a method for generating a hollow structure of a 3D model on the basis of a 2D laminated cross-sectional outline to reduce the amount of using a material or the weight of a printed matter during laminating and manufacturing. The method for generating a hollow structure based on a 2D laminated cross-sectional outline, according to an embodiment of the present invention, comprises the steps of: slicing the 3D model; generating a hollow structure outline on the basis of the result of the slicing; detecting an overhang area between adjacent hollow structure outlines; recalculating the hollow structure outline according to the result of detecting the overhang area; and generating a hollow structure mesh on the basis of the recalculated hollow structure outline. Accordingly, because 2D laminated cross-sectional data is used, a hollow structure can be generated without separate data processing, thereby reducing a calculation burden. In addition, because the hollow structure is processed so that an overhang area is not generated when generating the hollow structure, a support is not needed therein, thereby making post-processing easy.

    METHOD FOR MODIFYING DESIGN ON BASIS OF ADDITIVE CROSS-SECTION OUTLINE FOR 3D PRINTING
    15.
    发明公开
    METHOD FOR MODIFYING DESIGN ON BASIS OF ADDITIVE CROSS-SECTION OUTLINE FOR 3D PRINTING 审中-公开

    公开(公告)号：US20240005620A1

    公开(公告)日：2024-01-04

    申请号：US18038785

    申请日：2021-11-03

    Applicant: Korea Electronics Technology Institute

    Inventor： Hye In LEE ,  Hwa Seon SHIN ,  Sung Hwan CHUN ,  Sung Hun PARK

    IPC: G06T19/20 ,  G06T17/20 ,  B33Y50/00 ,  B29C64/386

    CPC classification number: G06T19/20 ,  G06T17/20 ,  B33Y50/00 ,  B29C64/386 ,  G06T2219/2021

    Abstract: Provided is a method for modifying a design on the basis of an additive cross-section outline for 3D printing of an additive manufacturing method. The method for modifying a design on the basis of an additive cross-section outline according to an embodiment of the present invention comprises the steps of: slicing a 3D model into a plurality of 2D layers; calculating a difference region between a first layer and a second layer that is a lower layer adjacent to the first layer; calculating a modified outline that minimizes a region required for support by reducing the outline of the difference region; and merging the modified outline and the outline of the second layer. Accordingly, a design can be modified with fewer calculation processes compared to the prior art, models can be modified for additive manufacturing without additional design knowledge, and since the design has been modified to minimize the region required for support, the amount of support can be reduced, thereby increasing material or printing time efficiency, and strengthening a design structure.

    SLICING 2D DATA-BASED PATTERN APPLICATION METHOD FOR REDUCING BINDER USAGE AMOUNT IN SAND BINDER JETTING
    16.
    发明申请
    SLICING 2D DATA-BASED PATTERN APPLICATION METHOD FOR REDUCING BINDER USAGE AMOUNT IN SAND BINDER JETTING 有权

    公开(公告)号：US20220410485A1

    公开(公告)日：2022-12-29

    申请号：US17780206

    申请日：2020-11-10

    Applicant: Korea Electronics Technology Institute

    Inventor： Hye In LEE ,  Sung Hun PARK ,  Hwa Seon SHIN ,  Sung Hwan CHUN ,  Jin Min JANG

    IPC: B29C64/386 ,  B33Y50/02 ,  G06T3/00

    Abstract: Provided is a slicing 2D data-based pattern application method for generating an output code in which the inside of a model is filled with a pattern, so as to reduce a binder usage amount and maintain a strength and a shape in sand binder jetting additive manufacturing. A slicing 2D data-based pattern application method according to an embodiment of the present invention comprises the steps of: generating 2D data by slicing an output model; generating an inner pattern in at least one of layers forming an output model in consideration of the set thickness of the layers and the outer thickness thereof and generating an output code by applying the generated inner pattern. Therefore, the cost of producing an additive manufacturing output can be reduced by reducing the binder usage amount through the application of the inner pattern. In addition, reducing the binder usage amount enables a mold to be destroyed with less force than conventionally used, can increase the proportion of molding sand reuse by reducing the binder usage amount, and can reduce recovery treatment costs of the molding sand. Furthermore, casting defects due to increased ventilation can be reduced.

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