Additive manufactured conglomerated powder removal from internal passages

Patent metadata

Field	Value
Publication number	US-11247250-B2
Application number	US-201916262050-A
Country	US
Kind code	B2
Filing date	Jan 30, 2019
Priority date	Nov 20, 2015
Publication date	Feb 15, 2022
Grant date	Feb 15, 2022

Abstract

A tool includes a head that extends form the flexible section, an emitter within the head; and a nozzle to eject a cooling fluid therefrom. A method of additively manufacturing a component including delivering series of thermal shocks to a conglomerated powder within an internal passage of an additively manufactured component to facilitate removal of the conglomerated powder.

First claim

What is claimed is:

1. A method of additively manufacturing a component, comprising:
additively manufacturing a component with a non-line of sight internal passage, the non-line of sight internal passage containing a conglomerated powder from additively manufacturing; and
delivering a series of thermal shocks with a tool to the conglomerated powder within the non-line of sight internal passage within the additive manufactured component, the series of thermal shocks operable to generate a thermal gradient within the conglomerated powder, breaking the conglomerated powder to facilitate removal of the conglomerated powder from within the non-line of sight internal passage.

2. The method as recited in claim 1 , further comprising inducing sufficient internal CTE (Coefficient of Thermal Expansion) differential strain to fracture the weak bonds between partially sintered metal particles of the conglomerated powder.

3. The method as recited in claim 1 , further comprising transporting the conglomerated powder out of the internal passage along spiral grooves in the tool.

4. The method as recited in claim 1 , wherein the internal passage defines an aspect ratio with a diameter to length of less than 1:4.

5. A method of additively manufacturing a component, comprising:
additively manufacturing a component with a non-line of sight internal passage, the non-line of sight internal passage containing a conglomerated powder;
alternating a series of light emissions with ejecting of cooling fluid from a tool extending within the non-line of sight internal passage, the alternating of the series of light emissions with the ejecting of cooling fluid operable to generate a thermal shock within the conglomerated powder, breaking the conglomerated powder to facilitate removal of the conglomerated powder from within the non-line of sight internal passage.

6. The method as recited in claim 5 , wherein the internal passage defines an aspect ratio with a diameter to length of less than 1:4.

7. The method as recited in claim 5 , wherein the emitter includes a fiber optic laser.

8. The method as recited in claim 5 , wherein the cooling fluid includes chilled water.

9. The method as recited in claim 5 , wherein the cooling fluid includes liquid nitrogen.

10. The method as recited in claim 5 , wherein the cooling fluid includes liquid helium.

11. The method as recited in claim 5 , further comprising transporting the conglomerated powder out of the internal passage along spiral grooves in the tool.

12. The method as recited in claim 5 , further comprising steering the tool.

13. The method as recited in claim 12 , wherein steering the tool comprises moving a flexible section of the tool.

14. The method as recited in claim 5 , further comprising a head that extends from the flexible section, the head comprises an emitter and a nozzle.

Assignees

• United Technologies Corp
• Raytheon Tech Corp

Inventors

• Ott Joe
• Twelves Jr Wendell V
• Kironn Lexia
• Butcher Evan

Classifications

• B22F10/12

  by photopolymerisation, e.g. stereolithography [SLA] or digital light processing [DLP] · CPC title

• B22F10/68

  Cleaning or washing · CPC title

• B22F10/25

  Direct deposition of metal particles, e.g. direct metal deposition [DMD] or laser engineered net shaping [LENS] · CPC title

• B22F10/28

  Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM] · CPC title

• B33Y40/20

  Post-treatment, e.g. curing, coating or polishing · CPC title