Glass Cutting Technology Combining Two Different Lasers
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GLASS CUTTING TECHNOLOGY COMBINING TWO DIFFERENT LASERS V. S. Kondratenko,1, 2, 3 A. N. Kobysh,1 Lu Hung-Tu,2 A. S. Naumov,2 and I. E. Velikovskii2 Translated from Steklo i Keramika, No. 6, pp. 12 – 15, June, 2020.
A new technology for laser cutting of glass along a curvilinear contour is described. This technology combines the use of two different methods of cutting in a single technological cycle: laser-controlled thermal splitting on rectilinear sections of the cutting contour and filamentation using a picosecond laser on curvilinear sections of the contour. The proposed technology makes it possible to significantly increase the productivity of the cutting process along curvilinear contours without compromising the strength characteristics of the glass products. Key words: laser-controlled thermal splitting (LCTS), filamentation, CO2 laser, picosecond laser, glass, curvilinear contour.
ing agent [7]. In this case the LCTS speed can reach 1000 mm/sec. However, when cutting along a curvilinear contour in glass, as any other brittle nonmetallic material with low thermal conductivity, the situation with the use of an elliptical laser beam changes radically [8]. In the first place, the conditions for heating glass on rectilinear and curvilinear sections with the aid of an elliptical beam differ substantially, and without significant reduction of the cutting speed on the curvilinear section the LCTS process will be interrupted. In the second place, even if the cutting speed is reduced on the curvilinear section, the quality and accuracy of the cutting will be difficult to monitor because the heating zone undergoes significant broadening. In the third place, it will be practically impossible to perform the cutting by the LCTS method on sections with a small radius of curvature, for example, less than 5 mm. A novel solution of the indicated problem by means of special optics or laser scanning devices shaping the beam, repeating the cutting contour along the entire length of the trajectory is proposed in [9]. This technique optimizes the conditions for laser thermal splitting by keeping the width and length of the heating zone constant over the entire length of the curvilinear cutting contour at constant LCTS speed. In the case where the cutting occurs along a curvilinear contour, aside from changing the shape of the laser beam, one other condition must be observed — the position of the cooling spot must be coordinated relative to the laser beam and the trajectory of the motion. Thus, it is also necessary to introduce an independent control of the coordinates of the cooling position relative to the trajectory of the motion.
Currently, the method of laser-controlled thermal splitting (LCTS) is one of the most effective methods of precision cutting of glass and other brittle non-metallic materials, on which subject there is an enormous number of publications on the successful use of the LCTS technology in practice [1 – 6]. The main advantages of the LCTS method are: – high cutting speeds, reaching 1000 mm
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