Apparatus and method for forming three-dimensional objects from solidifiable paste

• US 9,975,296 B2
• Filed: 02/06/2015
• Issued: 05/22/2018
• Est. Priority Date: 02/10/2014
• Status: Active Grant

• Current Assignee: Gulf Filtration Systems Inc. (Desktop Metal, Inc.)
• Original Assignee: Gulf Filtration Systems Inc. (Desktop Metal, Inc.)
• Inventors: El-Siblani, Ali
• Primary Examiner(s): Sanders, James
• Application Number:
  US15/117,628
• Publication Number:
  US 20160361872A1
• Time in Patent Office: 1,201 Days
• CPC Class Codes: B29C 64/135 the energy source being concentrated, e.g. scanning lasers or focused light sources
• CPC Class Codes: B29C 64/209 Heads; Nozzles
• CPC Class Codes: B29C 64/214 Doctor blades
• CPC Class Codes: B29C 64/241 for rotary motion
• CPC Class Codes: B29C 64/40 Structures for supporting 3D objects during manufacture and intended to be sacrificed after completion thereof
• CPC Class Codes: B29K 2105/16 Fillers
• CPC Class Codes: B29L 2009/00 Layered products
• CPC Class Codes: B33Y 10/00 Processes of additive manufacturing
• CPC Class Codes: B33Y 30/00 Apparatus for additive manufacturing; Details thereof or accessories therefor
• 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

Abstract

An apparatus and method for making a three-dimensional object from a solidifiable paste is shown and described. The apparatus includes a pastes spreader, at least a portion of which extends into the solidifiable paste. The container holding the solidifiable paste and the spreader are movable relative to one another. In one system, the spreader vibrates as the container and the spreader move relative to one another. In another system, the spreader is part of a spreader assembly in which a first spreader and second spreader are angled with respect to one another, and the assembly is rotatable and lockable into multiple rotational positions. A paste dispenser is also described which is configured to dispense paste while moving along a travel axis. The apparatus and method allow three-dimensional objects to be progressively built upside down by ensuring that the previously solidified object section has a substantially homogeneous layer of solidifiable material available for forming a new layer of the solidified object prior to exposure to solidification energy.

Claims

1. A method of forming a three-dimensional object, comprising:

traversing a solidifiable paste dispenser along a first axis while dispensing a solidifiable paste from the solidifiable paste dispenser;

moving a build platform along a build axis to contact an exposed surface of an object adhered to the build platform with the solidifiable paste; and

supplying solidification energy to a portion of the solidifiable paste in a pattern corresponding to the three-dimensional object, thereby solidifying the portion of the solidifiable paste, wherein the solidifiable paste dispenser is part of a solidifiable paste dispenser assembly that further comprises a solidifiable paste reservoir having a variable internal volume, the solidifiable paste dispenser has an internal volume in fluid communication with the variable internal volume, and the step of dispensing solidifiable paste from the solidifiable paste dispenser comprises reducing the variable internal volume, the steps of traversing the solidifiable paste dispenser along the first axis and reducing the variable internal volume of the solidifiable paste reservoir are carried out to dispense a selected thickness along the build axis of solidifiable paste from the solidifiable paste dispenser, the selected thickness is a first selected thickness, and the step of moving the build platform along the build axis to contact an exposed surface of the object with the solidifiable paste comprises forming a second selected thickness of the solidifiable paste between the exposed surface of the object and a rigid or semi-rigid solidification substrate that is transparent and/or translucent.

2. The method of claim 1, wherein the step of dispensing solidifiable paste from the dispenser comprises dispensing paste in a linear pattern along a second axis while traversing the solidifiable paste dispenser along the first axis.

3. The method of claim 1, wherein the solidifiable paste dispenser has an inlet and an outlet, and the outlet is located between a source of the solidification energy and the solidifiable paste reservoir.

4. The method of claim 1, wherein the step of supplying solidification energy to a portion of the dispensed solidifiable paste in a pattern corresponding to the three-dimensional object comprises projecting the solidification energy through the rigid or semi-rigid solidification substrate to solidify a region of the solidifiable paste to a thickness equal to the second selected thickness.

5. The method of claim 1, wherein the solidifiable paste reservoir is a vacuum filled cartridge.

6. The method of claim 1, wherein a solidifiable paste container further comprises a plurality of sidewalls.

7. The method of claim 1, wherein the rigid or semi-rigid solidification substrate has an upper surface to which a film coating is adhered.

8. The method of claim 1, further comprising:

providing a solidifiable paste dispenser travel assembly comprising an externally-threaded shaft having an internally threaded nut mounted thereon, and a bracket assembly connected to the internally-threaded nut, wherein the solidifiable paste dispenser is connected to the bracket assembly and rotation of the externally-threaded shaft causes the internally-threaded nut to translate along a travel axis relative to the externally-threaded shaft.

9. The method of claim 1, wherein the solidifiable paste dispenser comprises an outlet having a length along a second axis.

10. The method of claim 9, wherein the solidifiable paste dispenser comprises an inlet, the inlet and the outlet are spaced apart from one another along the build axis and are in fluid communication with one another.