Support cleaning system

• US 9,855,589 B2
• Filed: 04/06/2015
• Issued: 01/02/2018
• Est. Priority Date: 01/05/2010
• Status: Active Grant

• Current Assignee: Stratasys Incorporated
• Original Assignee: Stratasys Incorporated
• Inventors: Dunn, Benjamin N., McDonough, Thomas J., Smith, Bryan L., Swanson, William J., Orrock, James E., Mosher, Claudia, Shay, Randall R., Skubic, Robert L., Zalusky, Martin G., Kozlak, David M., Goetzke, Jerome W.
• Primary Examiner(s): BLAN, NICOLE R
• Application Number:
  US14/679,392
• Publication Number:
  US 20150209836A1
• Time in Patent Office: 1,002 Days
• Field of Search: None
• CPC Class Codes: B08B 3/045 using perforated containers, e.g. baskets, or racks immersed and agitated in a liquid bath using perforated drums B08B3/06
• CPC Class Codes: B08B 3/08 the liquid having chemical or dissolving effect substances used, see the relevant classes
• CPC Class Codes: B08B 3/102 with means for agitating the liquid by agitating the container B08B3/042, B08B3/044, B08B3/045, B08B3/06
• CPC Class Codes: B29C 64/40 Structures for supporting 3D objects during manufacture and intended to be sacrificed after completion thereof
• CPC Class Codes: B33Y 40/20 Post-treatment, e.g. curing, coating or polishing

Abstract

An automated support cleaning system comprising a tank disposed within a housing and configured to circulate an aqueous cleaning solution to remove a support structure from a three-dimensional model.

Claims

1. An automated method for removing a support structure from a three-dimensional model built with a fused deposition modeling system, the method comprising:

providing a support cleaning system having a tank that is separated into first, second and third chambers with a first wall having first and second ends secured to spaced apart first and second locations on the tank and a second wall having a first end secured to the tank at a third location between the first and second locations and a second end secured to the first wall wherein the first, second and third chambers are in fluid communication with each other with a first plurality of pores in the first wall between the first chamber and the third chamber, a second plurality of pores in the first wall between the first chamber and the second chamber and a third plurality of pores in the second wall between the second chamber and the third chamber;

providing an impeller having blades configured to rotate within the third chamber wherein the blades are aligned with an opening in the first wall wherein the opening is spaced from the first plurality of pores;

inserting the three-dimensional model and the support structure into the first chamber;

introducing a liquid into the tank to fill the tank to a selected fill level;

introducing a solid support removal material into the second chamber wherein the solid support removal material dissolves in the liquid over time to form a support removal composition; and

generating a current with the impeller by forcing the support removal composition through the opening in the first wall and wherein the current causes flow of the support removal composition through an interior volume of the tank in a loop between the third, first, and second chambers such that dissolved solid support removal material in the second chamber is carried to the first chamber and the impeller causes the support removal material to flow into the first chamber to maintain a concentration of the support removal material in the support material removal composition in the first chamber, such that at least a first portion of the support structure is dissolved in the first chamber.

2. The method of claim 1, and further comprising:

providing a user interface for receiving a user input;

initiating an automated support removal operation in response to the user input, comprising the step of;

introducing the liquid into the tank such that the liquid flows through the first, second and third plurality of pores to fill the tank to the selected fill level.

3. The method of claim 2, and further comprising:

draining the tank after the support structure has been removed from the three-dimensional model;

reintroducing the liquid into the tank after draining the tank;

rinsing the three-dimensional model with the liquid, and

draining the liquid from the tank.

4. The method of claim 2, and further comprising monitoring the fluid level in the tank to approximately maintain the selected fill level and draining the support material removal composition solution from the tank after at least partially dissolving the support structure.

5. The method of claim 1, wherein the support removal composition material comprises:

a perhydrate-based oxidizing agent;

a chelating agent; and

a material selected from the group consisting of sodium carbonate, sodium bicarbonate and combinations thereof.

6. The method of claim 1, and further comprising automatically draining the tank upon detecting an error condition.

7. The method of claim 1, wherein the support removal composition material comprises:

one or more oxidizing agents;

one or more chelating agents; and

one or more pH modifiers.

8. The method of claim 7, wherein the support removal composition material further comprises a surfactant.

9. The method of claim 8, wherein the surfactant comprises at least one of one or more of alcohol ethoxylates, one or more of alcohol propoxylates, one or more of alkylphenol ethoxylates, one or more of alkyl sulfates, one or more of alkyl sulfonates or one or more of sulfosuccinates.

10. The method of claim 7, wherein the one or more oxidizing agents include at least one of one or more hydrate-based compounds or one or more perhydrate-based compounds.

11. The method of claim 10, wherein the one or more hydrate-based compounds comprise one or more sodium perborates selected from the group consisting of sodium perborate monohydrate, sodium perborate trihydrate, sodium perborate tetrahydrate and combinations thereof.

12. The method of claim 10, wherein the one or more perhydrate-based compounds comprises sodium percarbonate.

13. The method of claim 7, wherein the one or more chelating agents comprise at least one of one or more glutamic acids, one or more glutamic acetates, iminodisuccinic acid or sodium iminodisuccinate.

14. The method of claim 7, wherein the one or more pH modifiers comprise at least one of one or more citric acids, one or more acetic acids, one or more citric acetates or one or more acetic acetates.

15. The method of claim 1, and further comprising heating the support material removal composition in the tank.

16. A method for removing a support structure from a three-dimensional model built with a fused deposition modeling system, the method comprising:

providing a tank having an interior volume configured to receive a solvent, where the interior volume is divided into a plurality of chambers via a plurality of porous walls with a first wall of the plurality of porous walls having first and second ends secured to spaced apart first and second locations on the tank and a second wall of the plurality of porous walls having a first end secured to the tank at a third location between the first and second locations and a second end secured to the first wall of the plurality of porous walls wherein the plurality of chambers comprises a first chamber, a second chamber, and a third chamber in fluid communication with each other with a first plurality of pores in the first wall of the plurality of porous walls between the first chamber and the third chamber, a second plurality of pores in the first wall of the plurality of porous walls between the first chamber and the second chamber, and a third plurality of pores in the second wall of the plurality of porous walls between the second chamber and the third chamber, wherein the plurality of porous walls configured to allow the solvent to flow therethrough wherein the first chamber of the plurality of chambers is configured to receive the three-dimensional model and support structure;

providing an impeller pump having blades configured to rotate within the third chamber of the plurality of chambers wherein the blades are aligned with an opening in the first wall of the plurality of porous walls wherein said first wall separates the third chamber and the first chamber wherein the opening is spaced apart from pores in the first wall of the plurality of porous walls;

providing a solid support material removal composition in the second chamber wherein the solid support material removal composition dissolves in the solvent over time;

filling the tank with the solvent to a fill level;

placing the three-dimensional model with the support structure in the first chamber; and

generating a current in the interior volume of the tank wherein the impeller forces the solvent through the opening in the first wall of the plurality of porous walls separating the third and the first chamber and circulating the solvent in a loop through the plurality of chambers to at least partially remove the support structure from the three-dimensional model.

17. The method of claim 16, wherein the solvent is an aqueous solution.

18. The method of claim 17, wherein the impeller pump is configured to intake the aqueous solution from the second chamber and direct a flow of the aqueous solution into and through the first chamber and into the third chamber, wherein the aqueous solution in the third chamber flows into the second chamber as the impeller pump directs the aqueous solution from the second chamber and into the first chamber.