Laser heating for the manufacture or repair of a turbine blade
A device for laser heating of a mechanical part of the turbine blade or turbine blade element type, including: one or more laser emitters, for respectively emitting at least a first laser radiation at a first predetermined power towards a first target area of the part and for emitting a second laser radiation at a second predetermined power towards a second target area of the part, different from the first target area, the second predetermined power being different from the first predetermined power.
1 . A laser heating device for heating a mechanical part or a part element, including a blade element or a blade of a turbine, according to a predetermined thermal profile, said heating device comprising:
a given laser source provided with plural laser emitters, respectively to emit at least one first laser radiation according to a first predetermined power in the direction of a first target area of the part or of said part element and to emit a second laser radiation according to a second predetermined power in the direction of a second target area of the part or of said part element distinct from the first target area, the second predetermined power being different from the first predetermined power, and
a control module of said laser emitter elements, said control module being provided with a memory storing geometric data relating to a geometry of the part element and positioning data of different target areas of the part element, said control module being configured to:
produce thermal profile data associating said geometric and position data of target areas of said part element with respective heating temperature values or associating position data of target areas of said part with respective heating temperature values,
modulate the respective emission power of said laser emitters of said laser source according to said thermal profile data,
wherein the laser emitters of the laser source are arranged on a support defining a cavity in which the part can be placed, with the laser emitters distributed along a closed contour around the cavity.
2 . The device according to claim 1 , wherein
said first laser radiation according to said first power and said second laser radiation according to said second power are emitted successively by the same laser emitter, or
said first laser radiation according to said first power and said second laser radiation according to said second power originate respectively and concomitantly from a first laser emitter and from a second laser emitter.
3 . The device according to claim 1 , wherein said given laser source comprises at least one first emitter belonging to a first support and at least one second emitter belonging to a second support distinct from the first support, a space between said first support and said second support being provided to accommodate said part.
4 . The device according to claim 1 , wherein the laser emitters are laser diodes emitting a laser ray perpendicular to the surface of an active semiconductor region called VCSEL (vertical-cavity surface-emitting laser) laser diodes.
5 . The device according to claim 1 , wherein said memory stores a three-dimensional model of the part element associated with structural data of its constituent material.
6 . A system for additive manufacturing by direct deposition of material of the metal powder or molten metal wire type comprising a laser heating device according to claim 1 .
7 . The additive manufacturing system according to claim 6 , provided with a material dispenser member and with another laser source distinct from said given laser source, the heating device being configured so that said laser emitters emit at a specific power so as to achieve heating at a temperature lower than the melting temperature of said material.
8 . A method for manufacturing or repairing a blade or of a blade element of an aircraft engine comprising:
additive manufacturing by laser-assisted powder spraying being preceded or followed by a heat treatment using a laser heating device according to claim 1 .
9 . The method according to claim 8 , wherein said heat treatment is performed at a temperature lower than the melting temperature of said powder.