A method of drilling a hole in a workpiece

B - Operations – Transporting – 23 – K

Patent

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Details

B23K 26/02 (2006.01) B23K 26/38 (2006.01) B23P 15/02 (2006.01) H05K 3/00 (2006.01)

Patent

CA 2211965

A hole (30) is drilled in a turbine blade (10) by laser drilling. The turbine blade (10) comprises a superalloy substrate (12), a bond coating (14) and a ceramic thermal barrier coating (16). The hole (30) is produced by firstly focusing the laser beam (26) such that the focal point (28) is on the surface of the ceramic thermal barrier coating (16) to drill a small diameter hole (18) through the turbine blade (10). The laser beam (26) is refocused such that the focal point (28) is spaced from the surface of the ceramic thermal barrier coating (16). The laser beam (26) is pulsed on and off to drill a large diameter hole (30) coaxially with the small diameter hole (18). The small diameter hole (18) allows the molten material and heat to be expelled from the hole ( 18) and reduces heating of the superalloy substrate (12) to reduce the thickness of the oxide layer and recast layer around the hole and prevent delamination of the ceramic thermal barrier coating (16).

Un trou (30) est percé dans une aube de turbine (10) par perçage au laser. L'aube (10) de la turbine comporte un substrat en superalliage (12), une couche de cohésion (14) et un revêtement isolant thermique en céramique (16). Le trou (30) est produit en focalisant le faisceau laser (26) de manière à ce que le point focal (28) se trouve sur la surface du revêtement isolant thermique en céramique (16) pour percer un trou de faible diamètre (18) à travers l'aube (10) de la turbine. Le faisceau laser (26) est refocalisé de manière à ce que le point focal (28) soit éloigné de la surface du revêtement isolant thermique en céramique (16). Le faisceau laser (26) est pulsé pour percer un trou de grand diamètre (30) en coaxialité avec le trou de faible diamètre (18). Le trou de faible diamètre (18) permet l'évacuation du métal en fusion et de la chaleur et réduit l'échauffement du substrat en superalliage (12) pour réduire l'épaisseur de la couche d'oxyde et la refondre à la périphérie du trou et prévenir ainsi le décollement du revêtement isolant thermique en céramique (16).

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