Process and freeform fabrication system for producing a three-dimensional object

• US 8,658,076 B2
• Filed: 07/08/2011
• Issued: 02/25/2014
• Est. Priority Date: 10/26/2007
• Status: Active Grant

• Current Assignee: Envisiontec GmbH
• Original Assignee: Envisiontec GmbH
• Inventors: El-Siblani, Ali
• Primary Examiner(s): Gupta, Yogendra
• Assistant Examiner(s): Grun, Robert J
• Application Number:
  US13/179,215
• Publication Number:
  US 20110260365A1
• Time in Patent Office: 963 Days
• Field of Search: 264/401, 264/460, 425/135
• US Class Current: 264/401
• CPC Class Codes: A61C 13/0013 using stereolithographic techniques
• CPC Class Codes: B29C 64/129 characterised by the energy source therefor, e.g. by global irradiation combined with a mask
• CPC Class Codes: B33Y 10/00 Processes of additive manufacturing
• CPC Class Codes: B33Y 70/10 Composites of different types of material, e.g. mixtures of ceramics and polymers or mixtures of metals and biomaterials
• CPC Class Codes: B33Y 80/00 Products made by additive manufacturing
• CPC Class Codes: G03F 7/0037 Production of three-dimensional images
• CPC Class Codes: Y10T 428/31 Surface property or characteristic of web, sheet or block

Abstract

The present invention provides a process for producing at least one three-dimensional object, comprising: providing a material to be solidified; delivering electromagnetic radiation and/or synergistic stimulation in a pattern or an image to a building region for solidifying said material; wherein said delivering of electromagnetic radiation and/or synergistic stimulation is performed selectively to a defined area or volume of said material to be solidified; and wherein an energy density of electromagnetic radiation and/or synergistic stimulation is controlled and/or adjusted in a border region of said pattern or image and/or is varied in border regions of patterns or images of different building regions of said material, to have an energy density different from the building region other than said border region(s), wherein the controlling and/or adjustment is dependent on, alone or in combination: (a) intensity of electromagnetic radiation and/or synergistic stimulation delivered to said defined area or volume of said material to be solidified; (b) total shape or contour shape of said defined area or volume of said material to be solidified; (c) size of said defined area or volume of said material to be solidified; and (d) material to be solidified. A device is provided likewise.

Claims

1. A process for producing at least one three-dimensional object, or for preparing the production thereof, said production process being of a type comprising:

providing a material to be solidified;

delivering electromagnetic radiation or synergistic stimulation in a pattern or an image to a building region for solidifying said material;

wherein said delivering of electromagnetic radiation or synergistic stimulation is performed selectively to a defined area or volume of said material to be solidified;

wherein said production or said preparation process includes the steps of;

performing a virtual or actual solidification step, in which the degree of either out-shining electromagnetic radiation or synergistic stimulation towards outside regions, or in-shining electromagnetic radiation or synergistic stimulation into internal regions respectively across a border region or border regions of a three-dimensional object to be constructed is observed or determined, and

adapting the energy density of electromagnetic radiation or synergistic stimulation in said border region(s) in response to said observed or determined degree of out- or in-shining across the border region(s).

2. The process according to claim 1, wherein said degree of out- or in-shining across the border region(s) is determined or observed in dependency of, alone or in combination:

(a) intensity of electromagnetic radiation or synergistic stimulation delivered to the defined area or volume of the material to be solidified;

(b) total shape or contour shape of the defined area or volume of the material to be solidified;

(c) size of the defined area or volume of the material to be solidified; and

(d) material to be solidified.

3. The process according to claim 1, wherein said adapting step is performed “

on the fly”

during a production job.

4. The process according to claim 1, wherein said adapting step is performed in an advance step of preliminarily preparing a three-dimensional object-producing device to be adjusted to a desired production job.

5. The process according to claim 1, wherein said adapting step involves generating bitmap data comprising gradation patterns or gradation images for selectively delivering controlled or adjusted energy density for one or more border regions of the three-dimensional object to be formed, wherein said gradation is preferably performed by using gray levels or colour levels.

6. The process according to claim 1, wherein said material to be solidified comprises a binder selected from the group consisting of photopolymers and adhesives.

7. The process according to claim 1, wherein said material to be solidified comprises a first binder substance and a second binder substance, and the first binder substance comprises a photocurable resin.

8. The process according to claim 1 wherein the material to be solidified comprises a photopolymer binder and a ceramic filler.

9. The process according to claim 1, wherein the step of delivering electromagnetic radiation or synergistic stimulation in a pattern or an image to a building region for solidifying said material comprises delivering electromagnetic radiation in a pattern or an image from a digital light projector.

10. The process according to claim 1, wherein the step of performing a virtual or actual solidification comprises delivering a reference energy density in a reference pattern to a reference solidifiable material, the reference pattern includes a reference border region, and the reference pattern has at least one of a reference total shape of a solidified area, a reference contour shape of a solidified area, and a reference size of a solidified area.

11. The process of claim 10, wherein the step of adapting the energy density of electromagnetic radiation or synergistic stimulation in said border region(s) in response to said observed degree of out- or in-shining across the border region(s) comprises adjusting the energy density relative to the reference energy density based on a relationship between a reference characteristic and a characteristic of the at least one three-dimensional object, wherein the characteristic is at least one selected from the group consisting of type of solidifiable material, total shape of a solidified area, contour shape of a solidified area, and size of a solidified area.

12. The process of claim 1, wherein the step of providing a material to be solidified comprises conveying a solidifiable material comprising a photocurable resin from a solidifiable material source to the building region.

13. A process for producing at least one three-dimensional object, comprising:

supplying an energy density to a reference border region of a reference solidifiable material based on a reference pattern of solidification energy to form a solidified area of the reference solidifiable material, wherein the reference pattern defines the reference border region, a reference total shape of the solidified area, a reference contour shape of the solidified area, and a reference size of the solidified area; and

observing or determining at least one of a degree of out-shining electromagnetic radiation or synergistic stimulation across the border region towards regions outside of the border region and in-shining electromagnetic radiation or synergistic stimulation across the border region toward regions internal of the border region, and adjusting the energy density supplied to the reference border region to a reference energy density that achieves a desired reference level of out-shining electromagnetic radiation or synergistic stimulation across the border region towards regions outside of the border region and in-shining electromagnetic radiation or synergistic stimulation across the border region toward regions internal of the border region.

14. The process of claim 13, further comprising supplying a production energy density to a production border region of a production solidifiable material in a production pattern of solidification energy, wherein the production pattern defines the production border region, the step of supplying a production energy density to a production border region comprises adjusting the production energy density relative to the reference energy density based on a relationship between a reference characteristic and a production characteristic, and the characteristic is at least one selected from the group consisting of type of solidifiable material, total shape of a solidified area, contour shape of a solidified area, and size of a solidified area.

15. The process of claim 14, wherein the step of supplying a production energy density to a border region of a production solidifiable material in a production pattern of solidification energy comprises adjusting a gray scale or color value of production energy in the production border region.

16. The process of claim 14, wherein the step of supplying a production energy density to a border region of a production solidifiable material comprises supplying the production energy intensity with a digital light projector.

17. The process of claim 14, wherein the production solidifiable material comprises a photocurable resin and a ceramic filler.

18. The process of claim 17, wherein the reference solidifiable material comprises a photocurable resin and a ceramic filler.