Laser machining of glass-ceramic materials

Details Laser machining of glass-ceramic materials Laser machining of glass-ceramic materials

B - Operations, Transporting

23

C

B23C 3/00 (2006.01) B23K 26/40 (2006.01) B28D 1/22 (2006.01) C03B 29/02 (2006.01) C03C 23/00 (2006.01) H01Q 1/42 (2006.01)

Patent

CA 2176610

Rough machining of a glass-ceramic material article such as a radome (20) is accomplished using a high-power Nd:YAG laser (60, 64). The radome (20) is rotated about its longitudinal axis (28), and the point of application of the laser beam (62) is translated generally parallel to the longitudinal axis (28) over either the inside (32) or outside (30) surface of the radome (20). The Nd:YAG laser (60, 64) preferably operates in a pulsed wave mode with a pulse duration of from about 0.3 to about 3 milliseconds, a pulse frequency of from about 50 to about 500 pulses per second, and a pulse intensity of at least about3 x 104 Watts per square centimeter. After laser rough machining, at least about 0.002 inches of material is removed from the rough-machined surface by a finish machining, preferably mechanical grinding.

L'usinage grossier d'un article en vitro-céramique comme un radôme (20) est réalisé au moyen d'un laser YAG de forte puissance (60,64). Le radôme pivote autour de son axe longitudinal (28), et le point d'application du faisceau laser(62) se déplace en général parallèlement à l'axe longitudinal (28) sur la surface intérieure (32) ou extérieure (30) du radôme (20). Le laser YAG (60, 64) fonctionne de préférence en mode d'ondes pulsées, avec une durée d'impulsion d'environ 0,3 à 3 millisecondes, une fréquence d'impulsion d'environ 50 à 500 impulsions par seconde et une intensité d'impulsion d'au moins 3 x 104 Watts par centimètre carré. Après usinage grossier au laser, on enlève au moins 0,002 pouce de matériau de la surface par un usinage de finition, de préférence par meulage mécanique.

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