Collecting / removing byproducts of laser ablation

Patent metadata

Field	Value
Publication number	US-9945253-B2
Application number	US-201514609154-A
Country	US
Kind code	B2
Filing date	Jan 29, 2015
Priority date	Jan 29, 2015
Publication date	Apr 17, 2018
Grant date	Apr 17, 2018

Abstract

A method is provided for operating a laser system. During an embodiment of this method, inert gas is directed against an object within a cavity of a collection device. An aperture is formed in the object by ablating the object with a laser beam that travels within the cavity and to the object. Byproducts of the ablation are removed from the cavity. During another embodiment of the method, inert gas is pooled against an object and a gas curtain is provided proximate a lens. The object is cut using a laser beam which travels from the lens, through the gas curtain and the pooled inert gas, to the object. Fumes and/or particulates produced by the formation are directed away from the laser beam.

First claim

We claim:

1. A method for operating a laser system, comprising:
directing inert gas against an object within a cavity of a collection device;
directing second gas into the cavity directly next to a lens disposed within the cavity;
forming an aperture in the object by ablating the object with a laser beam that travels within the cavity and to the object; and
removing byproducts of the ablation from the cavity;
wherein the laser beam travels from the lens, within the cavity, to the object.

2. The method of claim 1 , wherein the removing the byproducts of the ablation from the cavity comprises:
carrying the byproducts of the ablation within the cavity away in a vortical flow;
wherein a top portion of the vortical flow flows downward away from the lens; and
wherein a bottom portion of the vortical flow flows upward away from the object.

3. The method of claim 1 , wherein the directing of the inert gas comprises pooling the inert as against the lens within the cavity to substantially prevent the byproducts from contacting the lens.

4. The method of claim 1 , wherein the inert gas is directed into the cavity at an acute angle relative to a surface which defines the cavity.

5. The method of claim 1 , wherein
the byproducts are removed from the cavity through an outlet;
the inert gas is directed into the cavity through a first inlet positioned between the object and the outlet; and
the inert gas is directed into the cavity through a second inlet positioned between the lens and the outlet.

6. The method of claim 1 , wherein the inert gas is directed into the cavity at an acute angle relative to a surface which defines the cavity.

7. The method of claim 1 , wherein the byproducts are removed generally tangentially from the cavity.

8. The method of claim 1 , further comprising carrying the byproducts within the cavity in a vortical flow.

9. The method of claim 1 , wherein
the byproducts are removed from the cavity through an outlet; and
the inert gas is directed into the cavity through an inlet positioned between the object and the outlet.

10. The method of claim 1 , wherein the byproducts are removed from the cavity using a vacuum.

11. The method of claim 1 , wherein the directing of the inert gas comprises pooling the inert gas against the object within the cavity.

12. The method of claim 1 , wherein the object comprises a fiber-reinforced composite and/or is configured as at least a portion of an acoustic panel for a turbine engine.

13. The method of claim 1 , wherein the collection device comprises a sidewall and a shelf that projects radially into the cavity from the sidewall, and the shelf is configured with one or more inlets through which the gas is directed into the cavity proximate the lens.

14. The method of claim 13 , wherein the shelf longitudinally locates the lens within the cavity.

15. The method of claim 1 , wherein the laser beam travels along an axial centerline, and the second gas is directed into the cavity along a trajectory that is pointed axially relative to the axial centerline towards the lens.

16. The method of claim 1 , wherein the second gas is directed into the cavity along a trajectory that extends towards the lens and away from the object.

17. A method for operating a laser system, comprising:
pooling inert gas within a cavity against an object;
providing a gas curtain within the cavity directly next to a lens which is disposed within the cavity;
cutting the object using a laser beam which travels from the lens, through the gas curtain and the pooled inert gas, to the object; and
directing fumes and/or particulates produced by the cutting away from the laser beam.

18. The method of claim 17 , wherein
the pooling comprises directing the inert gas into the cavity of a collection device through a first inlet;
the providing comprises directing the gas into the cavity through a second inlet; and
the directing comprises removing the fumes and/or the particulates from the cavity through an outlet arranged longitudinally between the first and the second inlets.

19. The method of claim 17 , wherein the object comprises a fiber-reinforced composite and/or is configured as at least a portion of an acoustic panel for a turbine engine.

20. A method for operating a laser system, comprising:
directing inert gas against an object within a cavity of a collection device;
directing gas into the cavity proximate a lens;
forming an aperture in the object by ablating the object with a laser beam that travels within the cavity and to the object;
carrying byproducts of the ablation within the cavity away in a vortical flow, wherein a top portion of the vortical flow flows downward away from the lens, and wherein a bottom portion of the vortical flow flows upward away from the object; and
removing the byproducts being carried in the vortical flow from the cavity.

Assignees

• Rohr Inc

Inventors

• Gutierrez Jr Manuel B
• Novak Charles

Classifications

• B23K26/1476

  Features inside the nozzle for feeding the fluid stream through the nozzle · CPC title

• B23K26/128 Primary

  Laser beam path enclosures · CPC title

• B23K26/123

  in an atmosphere of particular gases · CPC title

• B23K26/142

  for the removal of by-products · CPC title

• B23K2103/16

  Composite materials · CPC title