System and method for automated laser ablation

Patent metadata

Field	Value
Publication number	US-11273520-B2
Application number	US-201916263331-A
Country	US
Kind code	B2
Filing date	Jan 31, 2019
Priority date	Jan 31, 2019
Publication date	Mar 15, 2022
Grant date	Mar 15, 2022

Abstract

A system and method for automated laser ablation includes an end effector for performing laser ablation at a location with restricted access. The systems and methods of the present disclosure specifically provide for a miniature laser end effector which may be inserted through a port or bore in order to ablate the surface of an internal component of a complex assembly. In several embodiments of the present subject matter, the end effector is mounted on an automated machine and coupled to a laser system.

First claim

What is claimed is:

1. A repair system for performing laser ablation on a workpiece, the system comprising:
an automated machine having a first controller and an end effector;
a laser system having a second controller and being operably coupled to the end effector at a beam entry port via a fiber-optic cable;
a pressurized gas source coupled to the end effector via a gas line and coupled to the first controller; and
wherein the end effector comprises:
an effector housing having a body extending lengthwise between a proximal end and a distal end opposite thereof, wherein the body defines the beam entry port to receive a laser beam into the effector housing,
a dynamic beam diverter contained within the effector housing downstream of the proximal end,
a focal lens coupled to a focal adjustment mechanism and contained within the effector housing downstream of the dynamic beam diverter, and
a mirror contained within the effector housing downstream of the focal lens, wherein the beam entry port, the dynamic beam diverter, the focal lens, and the mirror define a beam path within the effector housing, and wherein the mirror is angled to direct the laser beam from the focal lens through an aperture.

2. The repair system of claim 1 , wherein the dynamic beam diverter comprises:
a prism held in a rotational bearing; and
a rotor coupled to the rotational bearing, wherein the rotor includes a plurality of vanes.

3. The repair system of claim 2 , wherein the plurality of vanes are oriented to convert an energy from a portion of a pressurized gas into a rotational speed of 9,000 rotations per minute to 20,000 rotations per minute.

4. The repair system of claim 1 , wherein the effector housing further defines the aperture, the repair system further comprising:
a plurality of gas jet ports contained within the effector housing, coupled to the gas line, and aligned with the aperture, wherein at least one gas jet port of the plurality of gas jet ports is oriented to shield the mirror with a gas jet.

5. The repair system of claim 4 , further comprising:
a port actuator coupled to at least one gas jet port of the plurality of gas jet ports, wherein the port actuator directs the flow of the gas jet.

6. The repair system of claim 4 , further comprising:
a suction apparatus coupled to the end effector via a suction line and coupled to the first controller; and
an intake operably coupled to the aperture and the suction line.

7. The repair system of claim 1 , wherein the effector housing has a maximal width of 10 mm to 21 mm and a length of 25 mm to 75 mm.

8. The repair system of claim 1 , wherein the mirror is movably coupled to the effector housing, and wherein the end effector further comprises a mirror actuator coupled to the mirror to move the mirror between a first position and at least a second position.

9. The repair system of claim 1 , wherein the laser beam has a peak power range of 500 kW to 2 MW.

10. The repair system of claim 1 , wherein the end effector further comprises a distance measuring apparatus coupled to the end effector and orientated to determine a working distance between the effector housing and the workpiece.

11. The repair system of claim 1 , wherein the end effector is a first end effector, the system further comprising a second end effector configured to operate in tandem with the first end effector.

12. The repair system of claim 1 , wherein the workpiece is a component of a gas turbine engine accessible through an orifice having a diameter of 11 mm to 22 mm.

13. A method for performing laser ablation on a workpiece at a location with restricted access, the method comprising:
coupling a pressurized gas source to an end effector via a gas line and to a first controller;
positioning the end effector a working distance from the workpiece, the end effector being coupled to an automated machine having the first controller, the end effector comprising:
an effector housing having a body extending lengthwise between a proximal end and a distal end opposite thereof, wherein the body defines an aperture, wherein the proximal end defines a beam entry port,
a dynamic beam diverter contained within the effector housing downstream of the proximal end,
a focal lens coupled to a focal adjustment mechanism contained within the effector housing downstream of the dynamic beam diverter,
a mirror contained within the effector housing downstream of the focal lens, wherein the beam entry port, the dynamic beam diverter, the focal lens, and the mirror define a beam path within the effector housing;

activating a laser system to transmit a laser beam to the beam entry port of the end effector via a fiber-optic cable, wherein the laser system comprises a second controller and operably coupled to the end effector at the beam entry port via a fiber-optic cable;
diverting the laser beam from an axial path by employing the dynamic beam diverter;
focusing the laser beam; and
directing the laser beam through the aperture onto the workpiece with the mirror.

14. The method of claim 13 , wherein the dynamic beam diverter comprises:
a prism held in a rotational bearing; and
a rotor coupled to the rotational bearing, wherein the rotor includes a plurality of vanes.

15. The method of claim 14 , further comprising:
orienting the plurality of vanes such that an energy from a portion of a pressurized gas is converted into a rotational speed of 9,000 rotations per minute to 20,000 rotations per minute.

16. The method of claim 13 , wherein the effector housing has a maximal width of 10 mm to 21 mm and a length of 25 mm to 75 mm.

17. The method of claim 13 , wherein the mirror is movably coupled to the effector housing, and wherein the end effector further comprises a mirror actuator coupled to the mirror to move the mirror between a first position and at least a second position.

18. The method of claim 13 , wherein the laser beam has a peak power range of 500 kW to 2 MW.

19. The method of claim 13 , wherein the end effector is a first end effector, and wherein a second end effector operates in tandem with the first end effector.

20. The method of claim 13 , wherein the workpiece is a component of a gas turbine engine accessible through an orifice having a diameter of 11 mm to 22 mm.

Assignees

• Gen Electric

Inventors

• Diwinsky David Scott
• Fullington Michael Dean
• Roberts Herbert Chidsey
• Hay Jacob Cole
• Ream Stanley Louis
• Walters Craig Thompson

Classifications

• B23K26/0622

  by shaping pulses · CPC title

• B23K26/38

  by boring or cutting · CPC title

• B23K26/16

  Removal of by-products, e.g. particles or vapours produced during treatment of a workpiece (by a fluid stream B23K26/142) · CPC title

• B23K26/362

  Laser etching · CPC title

• B23K26/082

  Scanning systems, i.e. devices involving movement of the laser beam relative to the laser head · CPC title