Systems and methods for powder recovery, cleaning, and blending, for additive manufacturing

Patent metadata

Field	Value
Publication number	US-11718033-B2
Application number	US-202017098739-A
Country	US
Kind code	B2
Filing date	Nov 16, 2020
Priority date	Nov 15, 2019
Publication date	Aug 8, 2023
Grant date	Aug 8, 2023

Abstract

A method of recycling build material powder including collecting in a keg an amount of excess build material powder during the additive manufacturing of a part cake. The part cake and keg are transferred to a de-powdering station. The part cake is de-powdered to release a mixture of reusable powder and contaminants. The mixture is sieved to remove the contaminants and deposit the reusable powder to the keg.

First claim

What is claimed:

1. A method of recycling build material powder, comprising the steps of:
collecting in at least one keg an amount of excess build material powder during the process of additively manufacturing a part cake and, separately, collecting in a fines collecting container an amount of printing fines generated during the process of additively manufacturing the part cake;
transferring the part cake and the at least one keg to a de-powdering station;
de-powdering the part cake to release a mixture of reusable powder, de-powdering fines, and contaminants;
sieving the mixture of reusable powder and contaminants to deposit the reusable powder to the at least one keg for removing at least some of the contaminants, and separately, collecting the de-powdering fines using a fines collection system;
combining at least one of the printing fines and the de-powdering fines with the reusable powder in the at least one keg;
disposing at least one of the at least one kegs on a blending station and agitating the at least one keg to mix the combination of the reusable powder and at least one of the printing fines and the de-powdering fines until is suitable for further additive manufacturing of part cake.

2. The method of claim 1 , further comprising the step of:
depositing to the at least one keg an amount of virgin powder.

3. The method of claim 2 , further comprising the steps of:
coupling the at least one keg to a blender; and
operating the blender to blend the reusable powder and the virgin powder to a consistent blend.

4. The method of claim 1 wherein during the step of de-powdering, collecting an amount of fines in a fines disposal container.

5. The method of claim 1 wherein one of during or after the step of sieving removing the contaminants to a scrap disposal container.

6. The method of claim 1 wherein during the step of sieving, selectively dosing the mixture of reusable powder and contaminants into the sieve.

7. The method of claim 6 wherein selectively dosing includes altering a dosage rate to optimize a sieving parameter.

8. The method of claim 1 wherein the selectively dosing includes ultrasonically shaking the sieve to optimize a sieving parameter.

9. A system for recycling build material powder, comprising:
at least one keg configured to receive an amount of excess build material powder during the additive manufacturing of a part cake;
a printing fine collection system configured to separately collect printing fines during the additive manufacture of the part cake;
a de-powdering station configured to receive the at least one keg and the park cake and de-powder the part cake to release a mixture of reusable powder and contaminants;
a sieve configured to separate the reusable powder from the contaminants and deposit the reusable powder to the at least one keg;
a blending station configured to agitate at least one of the at least one kegs to mix a combination of the reusable powder and at least one of the printing fines and the de-powdering fines until it is suitable for reuse in further additive manufacturing.

10. The system of claim 9 , further comprising:
a source of virgin powder configured to provide virgin powder to the at least one keg.

11. The system of claim 10 , further comprising:
a blender configured to blend the reusable powder and the virgin powder to a consistent blend.

12. The system of claim 9 wherein the de-powdering station is configured to remove fines to a fines disposal container during de-powdering.

13. The system of claim 9 wherein the sieve is configured to remove the contaminants to a scrap disposal container.

14. The system of claim 9 wherein the de-powdering station is configured to selectively dose the mixture of reusable powder and contaminants deposited to the sieve.

15. The system of claim 14 wherein the de-powdering station is configured to alter a dosage rate to optimize a sieving parameter.

16. The system of claim 14 wherein the de-powdering station is configured to ultrasonically shake the sieve to optimize a sieving parameter.

17. A method of recycling build material powder, comprising the steps of:
disposing a part cake and at least one keg in a de-powdering station;
de-powdering the part cake to release a mixture of reusable powder and contaminants; and
sieving the mixture of reusable powder and contaminants to deposit the reusable powder to the at least one keg while removing the contaminants;
combining at least one of printing fines and an amount of de-powdering fines, collected by a de-powdering fines collection system during an additive manufacturing process that created the part cake, with the reusable powder in the keg; and
disposing at least one of the at least one kegs on a blending station and agitating the at least one keg to mix the combination of the reusable powder and at least one of the printing fines and the de-powdering fines until suitable for further additive manufacturing of part cake.

18. The method of claim 17 , further comprising the step of:
depositing to the at least one keg an amount of virgin powder.

19. The method of claim 18 , further comprising the steps of:
coupling the at least one keg to a blender; and
operating the blender to blend the reusable powder and the virgin powder to a consistent blend.

20. The method of claim 17 wherein during the step of de-powdering, collecting an amount of fines in a fines disposal container.

21. The method of claim 1 further comprising the step of sieving the excess build material powder.

Assignees

• Desktop Metal Inc

Inventors

• Myerberg Jonah
• Schmitt Peter

Classifications

• B29C64/357 Primary

  Recycling · CPC title

• B07B9/00

  Combinations of apparatus for screening or sifting or for separating solids from solids using gas currents; General arrangement of plant, e.g. flow sheets · CPC title

• B29C64/35

  Cleaning · CPC title

• B33Y30/00

  Apparatus for additive manufacturing; Details thereof or accessories therefor · CPC title

• B33Y40/00 Primary

  Auxiliary operations or equipment, e.g. for material handling · CPC title