Method and system for three-dimensional fabrication

Patent metadata

Field	Value
Publication number	US-11801644-B2
Application number	US-202016871077-A
Country	US
Kind code	B2
Filing date	May 11, 2020
Priority date	Apr 1, 2007
Publication date	Oct 31, 2023
Grant date	Oct 31, 2023

Abstract

A method of three-dimensional fabrication of an object is disclosed. The method comprises: forming a plurality of layers in a configured pattern corresponding to the shape of the three-dimensional object, at least one layer of the plurality of layers being formed at a predetermined and different thickness selected so as to compensate for post-formation shrinkage of the layer along a vertical direction. In various exemplary embodiments of the invention spread of building material of one or more layers is diluted at least locally such as to maintain a predetermined thickness and a predetermined planar resolution for the layer.

First claim

What is claimed is:

1. A method of three-dimensional fabrication of an object, comprising:
forming a plurality of layers in a configured pattern corresponding to the shape of the three-dimensional object, and
rescaling at least one layer of said plurality of layers along at least one direction so as to compensate for post-formation shrinkage of said layer along said at least one direction, wherein said rescaling is selected based on a monotonically decreasing function of a formation time of a layer.

2. The method of claim 1 , wherein said rescaling comprises rescaling digital data representing the object.

3. The method of claim 1 , wherein, for all layers, said rescaling is according to the formation time of a predetermined layer.

4. The method of claim 1 , wherein said rescaling comprises rescaling during said formation of said plurality of layers.

5. The method of claim 1 , wherein said rescaling comprises rescaling along two horizontal directions.

6. The method of claim 1 , wherein said rescaling comprises rescaling along at least one horizontal direction and along a vertical direction.

7. The method of claim 6 , wherein a scaling factor of said rescaling along said vertical direction is less than a scaling factor of said rescaling along said at least one horizontal direction.

8. The method of claim 1 , wherein said function is a linear decreasing function of said formation time of said layer.

9. The method of claim 1 , wherein for at least one rescaled layer, a location of a center of mass of said layer after said rescaling is the same as a location of a center of mass of said layer before said rescaling.

10. The method of claim 1 , wherein said forming is executed such that a formation time of all layers is the same.

11. A system for three-dimensional fabrication of an object, comprising:
a three-dimensional fabrication apparatus, configured for forming a plurality of layers in a configured pattern corresponding to the shape of the three-dimensional object;
said three-dimensional fabrication apparatus having a controller configured to ensure that at least one layer of said plurality of layers is rescaled along at least one direction so as to compensate for post-formation shrinkage of said layer along said at least one direction, wherein said rescaling is selected based on a monotonically decreasing function of a formation time of a layer.

12. The system of claim 11 , wherein said controller is configured to rescale digital data representing the object.

13. The system of claim 11 , wherein said controller is configured to rescale all layers according to the formation time of a predetermined layer.

14. The system of claim 11 , wherein said controller is configured to rescale during said formation of said plurality of layers.

15. The system of claim 11 , wherein said controller is configured to rescale along two horizontal directions.

16. The system of claim 11 , wherein said controller is configured to rescale along at least one horizontal direction and along a vertical direction.

17. The system of claim 16 , wherein a scaling factor of said rescaling along said vertical direction is less than a scaling factor of said rescaling along said at least one horizontal direction.

18. The system of claim 11 , wherein said function is a linear decreasing function of said formation time of said layer.

19. The system of claim 11 , wherein for at least one rescaled layer, a location of a center of mass of said layer after said rescaling is the same as a location of a center of mass of said layer before said rescaling.

20. The system of claim 11 , wherein said controller is configured to ensure that a formation time of all layers is the same.

Assignees

• Stratasys Ltd

Inventors

• Kritchman Eliahu M
• Napadensky Eduardo

Classifications

• G06F2113/10

  Additive manufacturing, e.g. three-dimensional [3D] printing · CPC title

• G06F30/20

  Design optimisation, verification or simulation (optimisation, verification or simulation of circuit designs G06F30/30) · CPC title

• Y02P10/25

  Process efficiency · CPC title

• B29C64/393 Primary

  for controlling or regulating additive manufacturing processes · CPC title

• B29C64/00

  Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering · CPC title