Apparatus and method for solid freeform fabrication

• US 8,609,204 B2
• Filed: 06/04/2009
• Issued: 12/17/2013
• Est. Priority Date: 06/05/2008
• Status: Active Grant

• Current Assignee: Stratasys Incorporated
• Original Assignee: Stratasys Incorporated
• Inventors: Kritchman, Eliahu M.
• Primary Examiner(s): WIECZOREK, MICHAEL P
• Application Number:
  US12/478,286
• Publication Number:
  US 20090304952A1
• Time in Patent Office: 1,657 Days
• Field of Search: 156/272.2, 156/277, 156/288, 264/400, 264/401, 427/595, 427/258, 427/286
• US Class Current: 427/595
• CPC Class Codes: B29C 2035/0822 using IR radiation
• CPC Class Codes: B29C 2035/0827 using UV radiation
• CPC Class Codes: B29C 2035/0877 using electron radiation, e.g. beta-rays
• CPC Class Codes: B29C 35/08 by wave energy or particle radiation B29C64/00, B29C71/04 take precedence
• CPC Class Codes: B29C 35/0805 using electromagnetic radiation
• CPC Class Codes: B29C 64/112 using individual droplets, e.g. from jetting heads
• CPC Class Codes: B33Y 10/00 Processes of additive manufacturing

Abstract

A Solid Freeform Fabrication system, apparatus and method is provided, that includes a movable fabrication tray adapted to hold an object being fabricated; a depositing surface to hold deposited materials, and ink jet printing heads to selectively deposit a plurality of building materials on the depositing surface; wherein the deposited materials are merged to the object being fabricated, when said fabrication tray moves said object being fabricated to be in contact with said deposited materials.

Claims

1. A method of fabricating 3-D objects, comprising:

selectively depositing two or more different building materials, in layers, on a depositing surface, using two or more inkjet printing heads, each of said layers corresponding to a cross section of a three-dimensional object to be fabricated, wherein at least one of the layers includes at least two of said two or more different building materials; and

transferring, layer by layer, a deposited layer from the depositing surface to a fabrication tray prior to depositing a subsequent layer by providing relative movement between the object being fabricated on the fabrication tray and said deposited layer, until said deposited layer and a previously transferred layer make contact and are merged,

wherein a time interval between depositing the deposited layer and merging the deposited layer with the previously transferred layer is selectively configured in accordance with the three-dimensional object being fabricated and desired degree of solidification of the deposited layer such that the time interval is larger if the deposited layer is required to be self-supporting and smaller if the deposited layer is not required to be self-supporting.

2. The method of claim 1, wherein said object is suspended from the fabrication tray.

3. The method of claim 1, comprising at least partially curing said deposited layer prior to transferring.

4. The method of claim 1, comprising at least partially curing said deposited layer using a curing mechanism selected from the group comprising UV radiation, I-R radiation, other sources of electromagnetic radiation, electron beam, natural light, heating and cooling.

5. The method of claim 1, wherein the depositing surface is a rotating belt and further comprising exerting counter pressure against the depositing surface, using a backing plate or impression roller.

6. The method of claim 1, wherein at least one of said two or more building materials is photopolymer or wax.

7. The method of claim 1, including cooling said deposited layer.

8. The method of claim 1, including heating said deposited layer.

9. The method of claim 1, comprises applying a release layer on the deposition surface to enable easy release of said deposited materials.

10. The method of claim 1, wherein said depositing surface is a rotating belt.