Solid freeform fabrication of shelled objects
AssigneeStratasys, Inc.
InventorsDaniel DIKOVSKY, Avraham LEVY, Eduardo NAPADENSKY
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Abstract
A method of layerwise solid freeform fabrication is disclosed. The method comprises, for each of at least a few of the layers, dispensing and hardening at least a first modeling material and a second modeling material to form a core region and one or more envelope regions at least partially surrounding the core region. In some embodiments, the ratio between the elastic moduli of adjacent regions, when hardened, is from about 1 to about 20.
Claims21
A computerized controller for a solid freeform fabrication (SFF) system, the computerized controller comprising a circuit and being configured to operate the SFF system to dispense and harden at least a first modeling material and a second modeling material to form a core region and one or more envelope regions at least partially surrounding said core region, thereby to fabricate an object being constructed from a plurality of layers and from a layered core constituting core regions and a layered shell constituting envelope regions, wherein a width of said envelope region is calculated separately for each layer, said width being defined within a plane engaged by said layer.
A method of layerwise solid freeform fabrication, comprising, for each of at least a few of the layers:
- dispensing and hardening at least a first modeling material and a second modeling material to form a core region and one or more envelope regions at least partially surrounding said core region, each of said regions being characterized by an Izod impact resistance (IR) value and a heat distortion temperature (HDT), when hardened, wherein for at least one pair of regions in said layer, an inner region of said pair is characterized by a lower IR value and higher HDT value relative to an outer region of said pair;
- thereby fabricating an object being constructed from a plurality of layers and a layered core constituting core regions and a layered shell constituting envelope regions.
A method of layerwise solid freeform fabrication, comprising, for each of at least a few of the layers:
- dispensing and hardening at least a first modeling material and a second modeling material to form a core region and one or more envelope regions at least partially surrounding said core region, wherein a heat deflection temperature (HDT) characterizing said core region is below about 50° C. and an HDT characterizing at least one of said envelope regions is above about 50° C.;
- thereby fabricating an object being constructed from a plurality of layers and a layered core constituting core regions and a layered shell constituting envelope regions.
A method of layerwise solid freeform fabrication, comprising, for each of at least a few of the layers:
- dispensing and hardening at least a first modeling material and a second modeling material to form a core region and one or more envelope regions at least partially surrounding said core region, wherein a ratio between the elastic moduli of adjacent regions, when hardened, is from about 1 to about 20, and wherein a plurality of different layers of the structure have envelope regions of different widths, said widths being defined within a plane engaged by said layer.
Dependencies are inferred from the claim text.