Mitigating distortion of coated parts during laser drilling
AssigneeUnited Technologies Corporation
InventorsRichard L. Smith, Alan C. Barron
Life of this patent
Estimating the term…
Abstract
A method for drilling holes in a part includes positioning the part relative to a laser source, applying a first stress to the part, and applying a laser from the laser source to the part to drill a hole therein, wherein the first stress which is present during the application of the laser counteracts a second stress induced by the application of the laser.
Claims13
A method for drilling one or more holes in a jet engine exhaust liner, the method comprising:
- positioning the jet engine exhaust liner relative to a laser source, wherein the jet engine exhaust liner includes a metal substrate coated with a ceramic-based coating and the laser source is pointed at the ceramic-based coating;
- applying a first stress to the jet engine exhaust liner;
- and
- applying a laser from the laser source to the jet engine exhaust liner to drill a hole through the ceramic-based coating and the metal substrate,
- wherein the first stress is applied by applying a load to the jet engine exhaust liner while applying the laser,
- wherein the load is varied during the application of the laser and during subsequent cooling of the jet engine exhaust liner after application of the laser.
A method for drilling one or more holes in a jet engine exhaust liner, the method comprising:
- positioning the jet engine exhaust liner relative to a laser source, wherein the jet engine exhaust liner includes a metal substrate coated with a ceramic-based coating and the laser source is pointed at the ceramic-based coating;
- pre-bowing the jet engine exhaust liner;
- and
- applying a laser from the laser source to the pre-bowed jet engine exhaust liner to drill a hole through the ceramic-based coating and the metal substrate,
- wherein the pre-bowing opposes a stress induced by the application of the laser in the jet engine exhaust liner
- wherein the bow is varied during the application of the laser and during subsequent cooling of the jet engine exhaust liner after application of the laser.
A method for drilling one or more holes in a jet engine exhaust liner, the method comprising:
- positioning the jet engine exhaust liner relative to a laser source, wherein the jet engine exhaust liner includes a metal substrate coated with a ceramic-based coating and the laser source is pointed at the ceramic-based coating;
- applying a load at the jet engine exhaust liner;
- and
- applying a laser from the laser source to the jet engine exhaust liner to drill a hole through the ceramic-based coating and the metal substrate,
- wherein the load is present during the application of the laser and opposes a stress induced by the application of the laser in the jet engine exhaust liner,
- wherein the load is varied during the application of the laser and during subsequent cooling of the jet engine exhaust liner after application of the laser.
A method for drilling one or more holes in a jet engine exhaust liner, the method comprising:
- positioning a first side of the jet engine exhaust liner relative to a laser source, wherein the jet engine exhaust liner includes a metal substrate coated with a ceramic-based coating and the laser source is pointed at the ceramic-based coating;
- applying heat from a second side of the jet engine exhaust liner, the second side being opposite to the first side;
- and
- applying a laser from the laser source to the position of the jet engine exhaust liner to drill a hole through the ceramic-based coating and the metal substrate,
- wherein the heat is present during the application of the laser.
Dependencies are inferred from the claim text.