Method for manufacturing objects using powder products

Patent metadata

Field	Value
Publication number	US-11426792-B2
Application number	US-202017000888-A
Country	US
Kind code	B2
Filing date	Aug 24, 2020
Priority date	Feb 25, 2014
Publication date	Aug 30, 2022
Grant date	Aug 30, 2022

Abstract

A method of manufacturing a three-dimensional target object may include forming a shell from loose machining powder using an additive manufacturing process and subjecting the shell to a densification process to form a target object. The shell may define an enclosure that contains additional machining powder. The densification process may include causing metallurgical bonding between the shell and additional machining powder contained in the enclosure defined by the shell and shrinking and/or distorting the shape of the shell to conform the target object to a three-dimensional model for the target object. The shell may include a plurality of layers and/or parts that differ at least in respect of density. The plurality of layers and/or parts may be configured based at least in part on the shrinking and/or distorting to the shape of the shell needed to conform the target object to the three-dimensional model for the target object.

First claim

What is claimed is:

1. A method of manufacturing a three-dimensional target object, the method comprising:
forming a shell from loose machining powder using an additive manufacturing process, wherein the shell defines an enclosure that contains additional machining powder;
subjecting the shell to a densification process to form a target object, wherein the densification process comprises causing metallurgical bonding between the shell and additional machining powder contained in the enclosure defined by the shell and shrinking and/or distorting the shape of the shell to conform the target object to a three-dimensional model for the target object;
wherein the shell comprises a plurality of layers and/or parts that differ at least in respect of density, wherein the plurality of layers and/or parts are configured based at least in part on the shrinking and/or distorting the shape of the shell needed to conform the target object to the three-dimensional model for the target object.

2. The method of claim 1 , comprising:
forming the shell using electron beam melting, selective laser melting, or direct metal laser melting.

3. The method of claim 2 , comprising:
performing the electron beam melting, the selective laser melting, or the direct metal laser melting under a vacuum condition or a non-vacuum condition.

4. The method of claim 1 , wherein the additional machining powder contained in the enclosure defined by the shell comprises loose machining powder and/or sintered machining powder and/or a sintered supporting pattern.

5. The method of claim 1 , wherein the shell comprises a vacuum sealed three-dimensional shell having a predetermined internal porosity.

6. The method of claim 1 , wherein the densification process comprises hot isostatic pressing or pneumatic isostatic forging.

7. The method of claim 1 , wherein forming the shell comprise:
pumping air and/or inert gas from the shell through a duct defining a portion of the shell; and
sealing the shell to maintain a vacuum level in the enclosure defined by the shell.

8. The method of claim 1 , wherein forming the shell comprise:
melting and/or sintering at least a portion of the additional machining powder contained in the enclosure defined by the shell.

9. The method of claim 1 , comprising:
forming the shell based at least in part on a compensated-three-dimensional model for the target object, the compensated-three-dimensional model configured such that the shrinking and/or distorting the shape of the shell resulting from the densification process causes the target object to conform to the three-dimensional model for the target object.

10. The method of claim 9 , wherein:
the quantity of the plurality of layers and/or parts of the shell, the density level of respective layers and/or parts of the plurality of layers and/or parts of the shell, and/or the thickness of the plurality of layers and/or parts of the shell, are respectively determined based on the compensated-three-dimensional model.

11. The method of claim 1 , wherein the plurality of layers and/or parts of the shell comprises:
a first density level layer comprising a first density, and a second density level layer comprising a second density, wherein the first density is greater than the second density; and/or
a third density level part having a third density, and a fourth density level part having a fourth density, wherein the third density is greater than the fourth density.

12. The method of claim 1 , wherein forming the shell comprises:
forming a porous object; and
treating at least a portion of the porous object to provide a treated region defining a hermetic seal to an inner portion of the porous object.

13. The method of claim 12 , wherein treating the at least a portion of the porous object comprises performing an electron beam melting process or a laser sintering process.

14. The method of claim 12 , wherein treating the at least a portion of the porous object comprises performing a peening process, a burnishing process, a cold extrusion process, or a warm extrusion process.

15. The method of claim 12 , wherein treating the at least a portion of the porous object comprises applying a coating layer to the at least a portion of the porous object.

16. The method of claim 12 , wherein the porous object has a pore size distribution of from 10 to 100 micrometers prior to treating the at least a portion of the porous object.

17. The method of claim 12 , wherein at least a portion of the treated region has a density level of at least 95%; and/or
wherein at least a portion of the target object has a density level of at least 95%.

18. The method of claim 12 , wherein the treated region comprises an outer surface region that has a thickness of from 0.025 millimeters to 1 millimeter.

19. The method of claim 1 , wherein the densification process comprises using a selectively mechanically and plastically deforming machining technology.

20. The method of claim 19 , wherein the selectively mechanically and plastically deforming machining technology comprises a peening process, a burnishing process, a cold extrusion process, or a warm extrusion process.

Assignees

• Gen Electric

Inventors

• Wu Zhiwei
• Li Yanmin
• Abbott David Henry
• Chen Xiaobin
• Broderick Thomas Froats
• Marte Judson Sloan
• Woodfield Andrew Philip
• Ott Eric Allen

Classifications

• B22F3/1241 Primary

  layered · CPC title

• B22F10/80

  Data acquisition or data processing · CPC title

• B22F10/66

  by mechanical means · CPC title

• B22F10/38

  to achieve specific product aspects, e.g. surface smoothness, density, porosity or hollow structures · CPC title

• B22F10/28

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