Apparatus for droplet stream manufacturing

• US 5,259,593 A
• Filed: 04/16/1992
• Issued: 11/09/1993
• Est. Priority Date: 08/30/1990
• Status: Expired due to Term

• Current Assignee: University of Southern California
• Original Assignee: University of Southern California
• Inventors: Muntz, Eric P., Orme, Melissa E.
• Primary Examiner(s): Roy, Upendra
• Application Number:
  US07/868,883
• Time in Patent Office: 572 Days
• Field of Search: 75/331, 75/346, 264/9, 425/6, 266/78
• US Class Current: 266/78
• CPC Class Codes: B22F 2998/00 Supplementary information concerning processes or compositions relating to powder metallurgy
• CPC Class Codes: B22F 3/115 by spraying molten metal, i.e. spray sintering, spray casting
• CPC Class Codes: B22F 9/08 by casting, e.g. through sieves or in water, by atomising or spraying using electric discharge B22F9/14
• CPC Class Codes: C23C 4/123 Spraying molten metal

Abstract

A method of manufacture of a net form product, including directing a stream of liquid from a nozzle onto a collector of the shape of the desired product, applying a disturbance to the stream, preferably an amplitude modulated disturbance, to produce a droplet stream, and with the nozzle and collector in a chamber, controlling the chamber environment. An apparatus for manufacturing a net form product having a source of molten material under pressure, a support for positioning a product collector in a chamber with the collector defining a desired product, a droplet stream generator positioned within the chamber and including a nozzle, a conduit for conducting molten material from the material source to the generator nozzle, a mechanism, typically a modulator, for disturbing the droplet stream, and a drive mechanism for relative movement of the nozzle and support.

Claims

1. In an apparatus for manufacturing a net form product, the combination of:

a source of liquid material under pressure;

a chamber;

a support for positioning a product collector in said chamber, said collector defining the shape of a desired product;

liquid droplet stream generator means positioned within said chamber, said generator means including a nozzle;

conduit means for conducting molten material from said material source to said generator nozzle;

disturbance means for providing a disturbance to said stream at said nozzle to produce a stream of liquid droplets monodispersed in a single line; and

drive means for relative movement of said nozzle and said support for impacting liquid droplets of said stream onto said product collector in a predetermined pattern.

2. An apparatus as defined in claim 1 wherein said disturbance means includes means for providing a periodic disturbance to said stream.

3. An apparatus as defined in claim 1 wherein said disturbance means includes modulator means for providing an amplitude modulated disturbance to said stream.

4. An apparatus as defined in claim 1 including a plurality of said nozzles and a separate conduit means for each of said nozzles.

5. An apparatus as defined in claim 1 wherein said nozzle is a single stream nozzle.

6. An apparatus as defined in claim 1 wherein said nozzle is a multiple stream nozzle.

7. An apparatus as defined in claim 1 including a plurality of said nozzles and a separate conduit means for each of said nozzles, and

wherein each of said nozzles is a multiple stream nozzle.

8. An apparatus as defined in claim 1 including means for controlling the environment in said chamber.

9. An apparatus as defined in claim 1 including a plurality of sources of liquid material under pressure,

a plurality of nozzles, and

a separate conduit means for connecting each of said nozzles to a separate one of said sources.

10. The apparatus as defined in claim 1 wherein said drive means includes means for rotating said produce collector about an axis, and

means for moving said nozzle along said axis of rotation.

11. The apparatus as defined in claim 1 wherein said generator means includes first and second generators, each having a nozzle, and

said conduit means includes first and second conduits for said first and second generators, respectively, with said nozzles positioned to provide colliding droplet streams for forming disks of said material.

12. The apparatus as defined in claim 1 including means for directing a flow of gas into said droplet stream.

13. An apparatus as defined in claim 8 including means for producing a vacuum in said chamber.

14. An apparatus as defined in claim 8 including means for providing a reactive gas flow in said chamber.

15. The apparatus as defined in claim 11 wherein said generators means includes means for varying the velocities of said streams.

16. The apparatus as defined in claim 12 wherein said means for directly includes means for directing said gas flow counter current to said droplet stream.

17. The apparatus as defined in claim 12 wherein said means for directing includes means for directing said gas flow along with said droplet stream.

18. In an apparatus for producing a stream of disk shaped droplets, the combination of:

a source of liquid material under pressure;

a chamber;

liquid droplet stream generator means positioned within said chamber, said generator means including first and second nozzles;

conduit means for conducting liquid material from said material source to each of said generator nozzles for producing intersecting streams;

modulator means for providing an amplitude modulated disturbance to said streams at said nozzles to produce first and second streams of liquid droplets, with each stream monodispersed in a single line and with droplets of the intersecting streams impacting to form dis-shaped droplets monodispersed in a single line; and

means for maintaining a vacuum in said chamber.

19. The apparatus as defined in claim 18 wherein said generators means includes means for varying the velocities of said streams.