Method for laser drilling a counter-tapered through-hole in a material
AssigneeImra America, Inc.
InventorsRajesh S. Patel, James M. Bovatsek
Life of this patent
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Abstract
A method of forming a through-hole which is counter-tapered relative to a drilling laser involves directing, along an incidence axis and onto an impingement location on a first surface of a material, a laser beam of sufficient energy to ablate the material, the incidence axis being offset from a normal to the first surface at the impingement location. The material and the laser beam are then relatively rotated, for at least 360°, such that a through-hole having a larger exit opening than entrance opening is formed.
Claims13
A method of drilling a through-hole in a material having first and second surfaces separated by a predetermined thickness, the method comprising:
- directing, along an incidence axis and onto an impingement location on the first surface, a laser beam of sufficient energy to ablate the material, the incidence axis being offset from a normal to the first surface at the impingement location;
- and
- moving the material and the laser beam relative to one another along a closed path on the substrate,
- wherein moving comprises relatively rotating the material and the laser beam about a rotation axis which intersects the incidence axis at a point along the incidence axis which is closer to the first surface than to the second surface.
A method of forming a counter-tapered through-hole in a wall of a fuel injector nozzle, the wall having an interior surface defining a chamber and an exterior surface opposite said interior surface, comprising:
- directing, along an incidence axis and onto an impingement location on the exterior surface, a laser beam of sufficient energy to ablate the material of the wall, the incidence axis being offset from a normal to the exterior surface at the impingement location;
- and
- rotating the wall and the laser beam relative to one another such that a through-hole having a larger exit opening than entrance opening is formed.
A method of drilling a counter-tapered through-hole in a material having first and second surfaces separated by a predetermined thickness, the method comprising:
- directing, along an incidence axis and onto an impingement location on the first surface, a laser beam of sufficient energy to ablate the material, the incidence axis being offset from a normal to the first surface at the impingement location;
- and
- moving the material and the laser beam relative to one another such that a through-hole having a larger exit opening than entrance opening is formed.
Dependencies are inferred from the claim text.