Skillful three-dimensional printing

{
  "publication_number": "US10058920B2",
  "country": "US",
  "kind": "B2",
  "title": "Skillful three-dimensional printing",
  "abstract": "The present disclosure various apparatuses, and systems for 3D printing. The present disclosure provides three-dimensional (3D) printing methods, apparatuses, software and systems for a step and repeat energy irradiation process; controlling material characteristics and/or deformation of the 3D object; reducing deformation in a printed 3D object; and planarizing a material bed.",
  "claims": [
    "1. A method for printing a three-dimensional object, comprising using an energy beam directed to a pre-transformed material to: (a) transform the pre-transformed material to a first transformed material at a location that is at or above a bottom skin layer, wherein the bottom skin layer comprises a second transformed material, which first transformed material at least partially overlaps the second transformed material along a lateral dimension of the bottom skin layer, wherein the first transformed material and the second transformed material are part of the three-dimensional object; and (b) heat the second transformed material to increase a temperature of the second transformed material to a target temperature value that is (i) between a solidus temperature and a liquidus temperature of a material of the bottom skin layer, and/or (ii) at or above a temperature at which the material of the bottom skin layer plastically yields.",
    "2. The method of claim 1, wherein a center of the first transformed material is above the second transformed material along the lateral dimension of the bottom skin layer.",
    "3. The method of claim 1, wherein during printing, the first transformed material is above the bottom skin layer along a direction of a gravitational field.",
    "4. The method of claim 1, further comprising executing a simulation corresponding at least in part to the second transformed material to generate an output, wherein the energy beam has one or more parameters that are based at least in part on the output.",
    "5. The method of claim 4, wherein the simulation comprises a thermo-mechanical simulation.",
    "6. The method of claim 4, wherein the simulation comprises use of a material property of the three-dimensional object.",
    "7. The method of claim 1, further comprising using a system-on-chip (SOC), application specific integrated circuit (ASIC), and/or an application specific instruction-set processor (ASIPs) to direct the energy beam to increase the temperature of the second transformed material.",
    "8. The method of claim 1, further comprising using a graphical processing unit (GPU) to direct the energy beam to increase the temperature of the second transformed material.",
    "9. The method of claim 1, further comprising using a programmable logic device (PLD) and/or a field programmable gate array (FPGA) to direct the energy beam to increase the temperature of the second transformed material.",
    "10. The method of claim 1, further comprising using a feedback or feed-forward control scheme to direct the energy beam to increase the temperature of the second transformed material.",
    "11. The method of claim 1, further comprising using a closed loop or open loop control scheme to direct the energy beam to increase the temperature of the second transformed material.",
    "12. The method of claim 1, further comprising, prior to using the energy beam or while using the energy beam, dispensing the pre-transformed material at or above the bottom skin layer to form a material bed having an exposed surface, which exposed surface comes in contact with the energy beam during printing.",
    "13. The method of claim 12, further comprising dispensing a layer of the pre-transformed material that is generated by (1) removing an excess of pre-transformed material from the exposed surface of the material bed using a gas flow and (2) cyclonically separating the pre-transformed material from the gas flow.",
    "14. The method of claim 1, wherein the pre-transformed material comprises particles formed of at least one material comprising an elemental metal, metal alloy, ceramic, or an allotrope of elemental carbon.",
    "15. The method of claim 1, wherein the pre-transformed material comprises particles formed of at least one material comprising a polymer or a resin.",
    "16. A method for printing a three-dimensional object, comprising: (a) using an energy beam that is directed to a pre-transformed material to transform the pre-transformed material to a transformed material as part of the three-dimensional object, wherein the transformed material is above a bottom skin layer of the three-dimensional object; and (b) controlling at least one characteristic of the energy beam such that a temperature of the bottom skin layer at a position below the transformed material is (i) between a solidus temperature and a liquidus temperature of a material of the bottom skin layer, and/or (ii) at or above a temperature at which the material of the bottom skin layer plastically yields.",
    "17. The method of claim 16, wherein the transformed material comprises a melt pool.",
    "18. The method of claim 16, further comprising repeating (a) subsequent to (b).",
    "19. The method of claim 16, wherein the bottom skin layer is below the transformed material along a direction of a gravitational field during printing.",
    "20. The method of claim 16, wherein the at least one characteristic comprises power density, cross sectional area, trajectory, speed, focus, energy profile, dwell time, intermission time, or fluence of the energy beam.",
    "21. The method of claim 16, wherein the pre-transformed material comprises particles formed of at least one material comprising an elemental metal, metal alloy, ceramic, or an allotrope of elemental carbon.",
    "22. The method of claim 16, wherein the pre-transformed material comprises particles formed of at least one material comprising a polymer or a resin.",
    "23. The method of claim 16, wherein the bottom skin layer intersects with a sphere of radius XY, wherein an acute angle between a straight line XY and a direction normal to an average layering plane of the bottom skin layer is in a range from about 45 degrees to about 90 degrees.",
    "24. The method of claim 16, wherein during printing, the bottom skin layer is (i) a first-formed layer of the three-dimensional object, (ii) part of a hanging structure of the three-dimensional object, or (iii) a wall of a cavity of the three-dimensional object.",
    "25. The method of claim 24, wherein the bottom skin layer is part of the hanging structure, and wherein the hanging structure comprises a side that is disconnected from (i) a platform that supports a material bed of the pre-transformed material during printing, or (ii) another printed structure that is not part of the three-dimensional object.",
    "26. The method of claim 24, wherein the bottom skin layer is part of the hanging structure, wherein the hanging structure comprises auxiliary support features that are spaced apart by two (2) millimeters or more.",
    "27. The method of claim 24, wherein the bottom skin layer is at least a portion of the wall of the cavity, wherein the wall comprises a bottom side that is disconnected from (i) a platform that supports a material bed of the pre-transformed material during printing, or (ii) another printed structure that is not part of the three-dimensional object.",
    "28. The method of claim 24, wherein the wall comprises auxiliary support features that are spaced apart by two (2) millimeters or more.",
    "29. The method of claim 16, wherein the three-dimensional object is printed layer-by-layer, wherein an outermost layer of the three-dimensional object comprises, or is connected to, auxiliary support features that are spaced apart by two (2) millimeters or more.",
    "30. The method of claim 16, wherein the at least one characteristic of the energy beam is controlled before and/or during use of the energy beam to transform the pre-transformed material to the transformed material."
  ],
  "cpc": [
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  ],
  "assignees": [
    "VELO3D INC"
  ],
  "filing_date": "2018-02-09",
  "publication_date": "2018-08-28",
  "grant_date": "2018-08-28",
  "priority_date": "2015-12-10",
  "application_number": "US-201815893523-A",
  "family_id": "59013390",
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