Method of supporting a part

Patent metadata

Field	Value
Publication number	US-9550235-B2
Application number	US-201313960937-A
Country	US
Kind code	B2
Filing date	Aug 7, 2013
Priority date	Aug 7, 2013
Publication date	Jan 24, 2017
Grant date	Jan 24, 2017

Abstract

A method of supporting a part with particulate shape retaining media, the method including placing the part on a bed of the particulate shape retaining media, fluidizing the particulate shape retaining media until the part penetrates therein, and vibrating the bed of particulate shape retaining media to compact the particulate shape retaining media around the part. The part may be a green part to be debound in a powder injection molding process. Fluidization may be performed through vibrations at a different frequency than the compaction.

First claim

The invention claimed is:

1. A method of supporting a part with particulate shape retaining media, the method comprising:
placing the part on a bed of the particulate shape retaining media;
fluidizing the particulate shape retaining media until the part penetrates therein, including vibrating the bed of particulate shape retaining media at a first frequency to cause the fluidization; and
after the part has penetrated in the shape retaining media, changing the first frequency to a second frequency different from the first frequency and vibrating the bed of particulate shape retaining media at the second frequency to compact the particulate shape retaining media around the part.

2. The method as defined in claim 1 , wherein the part is a green part to be debound in a powder injection molding process, and the particulate shape retaining media is wettable by at least one binder component of the green part.

3. The method as defined in claim 2 , wherein the particulate shape retaining media is alumina.

4. The method as defined in claim 1 , wherein the first frequency is from about 30 Hz to about 60 Hz.

5. The method as defined in claim 1 , wherein the second frequency is lower than the first frequency.

6. The method as defined in claim 1 , wherein vibrating the bed of particulate shape retaining media to compact the particulate shape retaining media includes impacting a container containing the bed of particulate shape retaining media.

7. The method as defined in claim 6 , wherein vibrating the bed of particulate shape retaining media at the first frequency to fluidize the particulate shape retaining media is performed without impacting the container containing the bed of particulate shape retaining media.

8. The method as defined in claim 1 , wherein the particulate shape retaining media is fluidized until the part is completely covered by the particulate shape retaining media.

9. The method as defined in claim 1 , wherein the part includes at least one opening defined therein, and the bed of particulate shape retaining media is fluidized until the at least one opening is filled with the particulate shape retaining media.

10. A method of supporting a green part of a powder injection molding process with particulate shape retaining media for debinding, the method comprising:
placing the part on a bed of the particulate shape retaining media, the particulate shape retaining media being wettable by at least one binder component of the green part;
vibrating the bed at a first frequency causing fluidization of the particulate shape retaining media; and
after the part is covered by the shape retaining media, changing the first frequency to a second frequency different from the first frequency and compacting the shape retaining media with vibrations at the second frequency.

11. The method as defined in claim 10 , wherein the particulate shape retaining media is alumina.

12. The method as defined in claim 10 , wherein the bed is vibrated at the second frequency by a support member while allowing relative movement and impact between the bed and the support member.

13. The method as defined in claim 12 , wherein the bed is vibrated at the first frequency by vibrating the support member at the first frequency, the support member and the bed being rigidly interconnected during the vibration at the first frequency such as to avoid relative movement therebetween.

14. The method as defined in claim 10 , wherein the first frequency is from about 30 Hz to about 60 Hz.

15. The method as defined in claim 10 , wherein the second frequency is lower than the first frequency.

16. The method as defined in claim 10 , wherein an amplitude of the vibration at the second frequency is larger than an amplitude of the vibration at the first frequency.

17. The method as defined in claim 10 , wherein the particulate shape retaining media is fluidized until the part is completely covered by the particulate shape retaining media.

18. The method as defined in claim 10 , wherein the part includes at least one opening defined therein, and the bed of particulate shape retaining media is vibrated at the first frequency until the at least one opening is filled with the particulate shape retaining media.

Assignees

• Pratt & Whitney Canada
• Pratt & Whitney Canada

Inventors

• Scalzo Orlando
• Campomanes Marc

Classifications

• B22F3/24 Primary

  After-treatment of workpieces or articles {(B22F3/1146 takes precedence)} · CPC title

• B32B18/00

  Layered products essentially comprising ceramics, e.g. refractory products · CPC title

• C04B35/638

  Removal thereof · CPC title

• C04B35/634

  Polymers (C04B35/636 takes precedence) · CPC title

• C04B2237/36

  Non-oxidic · CPC title