THREE-DIMENSIONAL PRINTER SYSTEMS AND METHODS

• US 20160236408A1
• Filed: 10/15/2014
• Published: 08/18/2016
• Est. Priority Date: 10/15/2013
• Status: Active Grant

• Current Assignee: Wolf & Associates, Inc.
• Original Assignee: Wolf And Associates, Inc.
• Inventors: Gamboa, Felisa, Trenerry, Phillip Joseph, Craig, Miles Tyler, Wolf, Erick Packard
• Granted Patent: US 10,195,778 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B29C 48/802 Heating
• CPC Class Codes: B29C 64/106 using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material
• CPC Class Codes: B29C 64/118 using filamentary material being melted, e.g. fused deposition modelling [FDM]
• CPC Class Codes: B29C 64/209 Heads; Nozzles
• CPC Class Codes: B29C 64/321 Feeding
• CPC Class Codes: B29K 2105/0058 Liquid or visquous
• CPC Class Codes: B29K 2827/18 PTFE, i.e. polytetrafluorethene, e.g. ePTFE, i.e. expanded polytetrafluorethene
• CPC Class Codes: B29K 2855/02 ABS polymers, i.e. acrylonitrile-butadiene-styrene polymers
• CPC Class Codes: B29K 2875/00 Use of PU, i.e. polyureas or polyurethanes or derivatives thereof, as mould material
• CPC Class Codes: B29K 2877/00 Use of PA, i.e. polyamides, e.g. polyesteramides or derivatives thereof, as mould material
• CPC Class Codes: B29K 2995/0017 Heat stable
• CPC Class Codes: B33Y 30/00 Apparatus for additive manufacturing; Details thereof or accessories therefor

Abstract

Disclosed are embodiments of a three-dimensional (3D) printer for building 3D objects with layer based, additive manufacturing techniques. The 3D printer can have an extrusion assembly including a hot end for heating consumable material and depositing the consumable material in layers on a printing bed. The hot end can be moved in a horizontal plane parallel the printing bed while the printing bed can be moved perpendicular to the horizontal plane to print the 3D object.

Claims

1. A hot end for building three-dimensional objects from layered consumable material, the hot end comprising:

an extruder comprising an extrusion channel configured to direct consumable material through the extruder;

a base comprising a base channel configured to direct the consumable material to the extruder, the base connected to the extruder, the base having a heating element configured to heat the base, wherein at least a portion of a wall forming the base channel is in direct contact with the consumable material passing through the base; and

an isolator comprising an isolator channel configured to direct the consumable material to the base, the isolator connected to the base, the isolator being less thermally conductive relative to the base and the extruder,

wherein when layering the consumable material to build a three-dimensional object, the heating element generates heat that is conducted through the base and the extruder to the consumable material passing through the base channel and the extrusion channel while the isolator mitigates heat transfer to the consumable material passing through the isolator channel.

10. The hot end of claim 1, wherein the base comprises a cutout extending into the base, the cutout concentric with the base channel, and wherein the isolator comprises an extension projecting into the cutout, thereby concentrating the heat transferred to the consumable material in the base channel toward a downstream portion of the base along an extrusion direction of the consumable material through the hot end and mitigating heat transfer to the consumable material in an upstream portion of the base along the extrusion direction where the extension projects into the cutout.

13. The hot end of claim 1, wherein the isolator is sized to accept a filament tube within the isolator channel through at least a part of a length of the isolator channel along an extrusion direction of the consumable material through the hot end, the filament tube configured to direct the consumable material into the isolator.

16. The hot end of claim 13, further comprising an internal tube positioned within the isolator channel downstream of the filament tube along the extrusion direction, the internal tube configured to direct the consumable material along the isolator channel toward the base.

17. The hot end of claim 16, wherein the internal tube has a higher melting or glass transition temperature relative to the filament tube and has a lower coefficient of friction against consumable material relative to the isolator.

25. The hot end of claim 1, wherein a material of the isolator is capable of being heated above 300 degrees Celsius without deforming the isolator, the material of the isolator comprising a thermoplastic.

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28. An extrusion assembly for a three-dimensional printer configured to build three-dimensional objects from layered consumable material, the extrusion assembly comprising:

an extrusion housing configured to connect to a support configured to move the extrusion housing; and

a hot end assembly configured to connect to the extrusion housing, the hot end assembly comprising;

a tip comprising a tip connecting surface and a tip internal conduit configured to extrude consumable material through the tip, the tip having a first heat transfer rate, the tip connecting surface extending directly from the tip internal conduit;

a base comprising a base connecting surface and a base internal conduit configured to direct the consumable material through the base to the tip and heat the consumable material, the base connected to the tip and in direct thermal communication with tip via the base connecting surface being in direct contact with the tip connecting surface, the base connecting surface extending directly from the base internal conduit, the base housing a heating element configured to heat the base to a predetermined temperature, the base having a second heat transfer rate that is substantially equal to the first heat transfer rate of the tip; and

a sleeve comprising a sleeve conduit configured to direct the consumable material through the sleeve to the base, the sleeve connected to the base, the sleeve having a third heat transfer rate that is less than the first and second heat transfer rates,

wherein when layering the consumable material to build a three-dimensional object while the hot end assembly is moved via the support moving the extrusion housing connected to the hot end assembly, the heating element generates heat that is conducted through the base and the tip to the consumable material passing through the base internal conduit and the tip internal conduit while the sleeve mitigates heat transfer to the consumable material passing through the sleeve conduit.

37. The extrusion assembly of claim 28, wherein the sleeve conduit is sized to accept a filament tube within the sleeve conduit through at least a part of a length of the sleeve conduit along an extrusion direction of the consumable material through the hot end assembly, the filament tube configured to direct the consumable material into the sleeve.

45. The extrusion assembly claim 37, further comprising a heat exchanger disposed about the filament tube and in thermal communication with the filament tube, the heat exchanger configured to transfer heat away from the filament tube.

46. The extrusion assembly of claim 45, wherein the extrusion housing comprises a flow control device and a flow conduit configured to direct a cooling fluid to the heat exchanger for the heat exchanger to transfer heat from the filament tube to the cooling fluid when the hot end assembly is connected to the extrusion housing.

47. The extrusion assembly of claim 46, wherein the flow control device comprises a fan, and the cooling fluid comprises air, wherein the fan directs the air through the flow conduit over the heat exchanger to cool the filament tubevia forced convection.

48. The extrusion assembly of claim 46, wherein the flow conduit branches to direct the cooling fluid to cool the three-dimensional object while the three-dimensional object is being built.

49. The extrusion assembly of claim 45, further comprising a thermal isolating layer positioned about the sleeve and extending outwardly from the sleeve, the thermal isolating layer configured to inhibit heat transfer to the heat exchanger from the base.

50. The extrusion assembly of claim 49, further comprising a heat transfer layer positioned about the sleeve and extending outwardly from the sleeve, the heat transfer layer positioned upstream of the thermal isolating layer along the extrusion direction and in thermal communication with the thermal isolating layer, the heat transfer layer configured to transfer heat from the thermal isolating layer toward the heat exchanger.

51. The extrusion assembly of claim 50, wherein the sleeve comprises a support flange extending radially outward from the sleeve, the support flange engaging the heat transfer layer to secure the heat transfer layer in a predetermined position along the extrusion direction.

52. The extrusion assembly of claim 45, further comprising a thermal isolating layer positioned about the filament tube and extending outwardly from filament tube, the thermal isolating layer configured to inhibit heat transfer from the heat exchanger to the extrusion housing.

56. The extrusion assembly of claim 28, further comprising an other hot end assembly configured to connect to the extrusion housing, the other hot end assembly comprising:

an other tip comprising an other internal conduit configured to extrude the consumable material through the other tip, the other tip having the first heat transfer rate; and

an other sleeve comprising an other sleeve conduit configured to direct the consumable material through the other sleeve toward the other tip, the other sleeve having the third heat transfer rate that is less than the first and second heat transfer rates.

57. The extrusion assembly of claim 56, wherein the base of the hot end assembly is connected to the other tip and the other sleeve of the other hot end assembly to heat the consumable material passing through the other tip.

58. The extrusion assembly of claim 56, wherein the extrusion housing comprises a leveling mechanism configured to level the hot end assembly with the other hot end assembly in an y-z plane of the extrusion assembly, the y-z plane substantially parallel to an extrusion direction of the consumable material through the hot end assembly and the other hot end assembly, with an z-axis of the y-z plane parallel to the extrusion direction.

59. The extrusion assembly of claim 58, wherein the extrusion housing comprises a clamp configured to removably engage the support for the support to move the extrusion housing in an x-y plane that is substantially perpendicular to the extrusion direction.

60. The extrusion assembly of claim 59, wherein the clamp comprises a leveling wall disposed at an angle relative to the support when the clamp is engaged with the support, wherein movement of the leveling wall along a y-axis of the y-z plane relative to the support tilts the extrusion housing in the y-z plane to level the hot end assembly with the other hot end assembly when the extrusion housing is connected to the hot end assembly and the other hot end assembly.

61. The extrusion assembly of claim 60, wherein the support comprises a rod and a bearing, the rod extending along the y-axis beyond a perimeter of the clamp in the y-z plane, the bearing positioned within the perimeter of the clamp when the clamp is engaged with the support, wherein the hot end assembly and the other hot end assembly are connected to the extrusion housing with the tip and the other tip aligned along the y-axis, and wherein moving the leveling wall in the y-axis relative to the bearing changes a contact point on the leveling wall with the bearing to level the hot end assembly and the other hot end assembly in the y-z plane when the clamp is engaged with the support.

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64. A hot end for building three-dimensional objects from layered consumable material, the hot end comprising:

an extruder comprising an extrusion channel configured to direct consumable material through the extruder;

a heating element in thermal communication with the extruder, the heating element configured to heat the consumable material passing through the extruder;

an isolator comprising an isolator channel configured to direct the consumable material toward the extruder, the isolator being less thermally conductive relative to the extruder; and

a lining positioned within the isolator channel following a perimeter of the isolator channel, the lining configured to direct the consumable material along the isolator channel toward the extruder, the lining having a lower coefficient friction with the consumable material relative to the isolator,

wherein when layering the consumable material to build a three-dimensional object, the heating element generates heat that is conducted through the extruder to the consumable material passing through the extrusion channel while the isolator mitigates heat transfer to the consumable material passing through the isolator channel.

65. The hot end of claim 64, wherein the extrusion channel tapers to have a diameter that decreases along an extrusion direction of the consumable material through the hot end to promote flow of the consumable material.

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