Process of laser drilling a ceramic matrix composite material workpiece

摘要

The process for drilling holes in a ceramic matrix composite part e.g. combustion chamber wall or turbine blade of jet engine by a laser beam, comprises drilling an initial hole having an initial diameter and an axis (16) of hole by focussing the laser beam in a thickness of the part, drilling an intermediate hole coaxial with the initial hole by shifting the laser beam around the axis of hole, moving a focal point of the laser beam along the axis of the hole and activating the impulsions to obtain a final hole (30). The intermediate hole has a diameter higher than that of the initial hole. The process for drilling holes in a ceramic matrix composite part e.g. combustion chamber wall or turbine blade of jet engine by a laser beam, comprises drilling an initial hole having an initial diameter and an axis (16) of hole by focussing the laser beam in a thickness of the part, drilling an intermediate hole coaxial with the initial hole by shifting the laser beam around the axis of hole, moving a focal point of the laser beam along the axis of the hole and activating the impulsions to obtain a final hole (30). The intermediate hole has a diameter higher than that of the initial hole. The impulsions have a number of 1-5. The hole is oriented along an inclined axis of 30[deg] compared to a surface of the part.