Method of supporting a part

Patent metadata

Field	Value
Publication number	US-9862028-B2
Application number	US-201615387871-A
Country	US
Kind code	B2
Filing date	Dec 22, 2016
Priority date	Aug 7, 2013
Publication date	Jan 9, 2018
Grant date	Jan 9, 2018

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;
vibrating the bed at a first frequency to fluidize the particulate shape retaining media until openings in the part are filled with the particulate shape retaining media;
stopping the fluidization after the openings are filled with the particulate shape retaining media;
completely covering the part with additional particulate shape retaining media; and
after completely covering the part, vibrating the bed at a second frequency different from the first frequency to compact the particulate shape retaining media around the part and in the openings.

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 at the second frequency includes impacting a container containing the bed of particulate shape retaining media.

7. The method as defined in claim 6 , wherein vibrating the bed 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. A method of supporting a green part of a powder injection molding process for debinding, the method comprising:
placing the part on a bed of particulate shape retaining media wettable by at least one binder component of the green part, the bed defined in a first container;
vibrating the first container at a first frequency to cause fluidization of the particulate shape retaining media until openings in the part are filled with the particulate shape retaining media;
removing the part from the first container while retaining the particulate shape retaining media within the openings;
placing the part in a second container and covering the part with the particulate shape retaining media; and
after the part is covered, vibrating the second container at a second frequency different from the first frequency to compact the shape retaining media.

9. The method as defined in claim 8 , wherein the particulate shape retaining media is alumina.

10. The method as defined in claim 8 , wherein the second container is vibrated at the second frequency by a support member while allowing relative movement and impact between the second container and the support member.

11. The method as defined in claim 8 , wherein the first container is vibrated at the first frequency by vibrating a support member at the first frequency, the support member and the first container being rigidly interconnected during the vibration at the first frequency such as to avoid relative movement therebetween.

12. The method as defined in claim 8 , wherein the first frequency is from about 30 Hz to about 60 Hz.

13. The method as defined in claim 8 , wherein the second frequency is lower than the first frequency.

14. The method as defined in claim 8 , wherein an amplitude of the vibration at the second frequency is larger than an amplitude of the vibration at the first frequency.

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

Assignees

• Pratt & Whitney Canada

Inventors

• Scalzo Orlando
• Campomanes Marc

Classifications

• B22F3/1021 Primary

  Removal of binder or filler (removal of binder from ceramics C04B35/638) · CPC title

• B22F3/225 Primary

  by injection molding · CPC title

• B22F3/24

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

• B28B1/24

  by injection moulding {(injection moulding of ceramic slips B28B1/265; of tubular articles B28B21/38)} · CPC title

• B22F2003/248

  Thermal after-treatment · CPC title