Computer numerical control (CNC) additive manufacturing

• US 9,221,216 B2
• Filed: 08/09/2012
• Issued: 12/29/2015
• Est. Priority Date: 08/09/2011
• Status: Active Grant

• Current Assignee: University of Southern California
• Original Assignee: University of Southern California
• Inventors: Chen, Yong, Zhou, Chi
• Primary Examiner(s): Sanders, James
• Application Number:
  US13/571,066
• Publication Number:
  US 20130037993A1
• Time in Patent Office: 1,237 Days
• US Class Current: 1/1
• CPC Class Codes: B29B 13/08 by using wave energy or particle radiation
• CPC Class Codes: B29C 64/135 the energy source being concentrated, e.g. scanning lasers or focused light sources
• 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

Abstract

An additive manufacturing system and process are described. In one example of the invention, a fiber optic cable connected with an ultraviolet (UV) LED and related lens forms an accumulation tool. The cable is then merged inside a tank filled with liquid resin that is UV-curable. By controlling the on/off state of the UV-LED and the multi-axis motion of the cable, a physical model, having a desired shape, can be built by selectively curing liquid resin into solid.

Claims

1. A system for additive manufacturing, the system comprising:

a storage device;

a processing system connected to the storage device; and

a program stored in the storage device that causes the processing system to perform functions, including to;

cause a light emitting tool within a tank of uncured resin that emits light at an intensity sufficient to cure portions of the uncured resin to move in a desired path, thereby causing portions of the uncured resin to cure along the desired path; and

control the attachment force of resin cured by the light emitting tool by adjusting the gap between the light emitting tool and previously cured resin or by adjusting the speed at which the light emitting tool is moved;

or

control the shape of the cured resin by rotating the light emitting tool about multiple axes.

2. The system of claim 1, wherein the program stored in the storage device causes the processing system to convert a computer-aided design model into a numeric control G-code.

3. The system of claim 1, wherein the processing system comprises a computer numerical control (CNC) accumulation controller.

4. The system of claim 1, wherein the processing system comprises a microcontroller that adjusts the light output in a desired manner.

5. The system of claim 1, wherein the light emitting tool emits ultraviolet light.

6. The system of claim 1, wherein the light emitting tool includes a waveguide having a proximal end disposed to receive light from a light source and a distal end that emits the light.

7. The system of claim 6, wherein the waveguide comprises a fiber optic cable.

19. The system of claim 1 wherein the program stored in the storage device causes the processing system to control the attachment force of resin cured by the light emitting tool by adjusting the gap between the light emitting tool and previously cured resin.

20. The system of claim 1 wherein the program stored in the storage device causes the processing system to control the attachment force of resin cured by the light emitting tool by adjusting the speed at which the light emitting tool is moved.

21. The system of claim 1 wherein the program stored in the storage device causes the processing system to control the shape of the cured resin by rotating the light emitting tool about multiple axes.

8. A system for additive manufacturing, the system comprising:

a light source;

a waveguide having a proximal end disposed to receive light from the light source and a distal end;

a reservoir for holding a curable material;

a coating on the distal end of the waveguide that reduces attachment force between the distal end of the waveguide and material cured by light emitted from the distal end of the waveguide; and

a computer numerical control system that;

causes the distal end of the waveguide to move in a desired path while material in its vicinity is cured by light emitted by the distal end of the waveguide; and

controls the attachment force of resin cured by the light by adjusting the gap between the waveguide and previously cured resin or by adjusting the speed at which the waveguide is moved;

or

controls the shape of the cured resin by rotating the waveguide about multiple axes.

9. The system of claim 8, wherein the light source comprises an ultraviolet (UV) light source.

10. The system of claim 9, wherein the UV light source comprises a light emitting diode (LED).

11. The system of claim 8, wherein the curable material comprises a stereolithographic curable resin.

12. The system of claim 8, wherein the computer numerical control system comprises a 5-axis CNC machine.

13. The system of claim 8, wherein the waveguide comprises a fiber optic cable.

14. A method of additive manufacturing comprising moving a light emitting tool within a tank of uncured resin in a desired path while the light emitting tool emits light at an intensity sufficient to cure portions of the uncured resin, thereby causing portions of the uncured resin to cure along the desired path, and by:

controlling the attachment force of resin cured by the light emitting tool by adjusting the gap between the light emitting tool and previously cured resin or by adjusting the speed at which the light emitting tool is moved;

or

controlling the shape of the cured resin by rotating the light emitting tool about multiple axes.

15. The method of claim 14, wherein the light emitting tool comprises using a waveguide.

16. The method of claim 15, wherein the waveguide is a fiber optic cable.

17. The method of claim 14, wherein the resin comprises a stereolithography (SLA) resin.

18. The method of claim 14, wherein the moving is performed by a 5-axis computer numerical control (CNC) machine.