Study the Effect of Many Parameters on the Speed of Drilling Materials by Laser Beam

Abstract

The speed of drilling depends on different parameters such as power, material, time,distance between drilling tool and the material, the drilling tool, etc. In this paper; thelaser beam was used as drilling tool. Two types of lasers were used; CO2 laser (10.6μm& 25W) and pulse Nd:YAG laser (1st harmonic 1064nm & 2nd harmonic 532nm, 1J).Two different materials were used; pure silver (0.4mm thickness) and beech wood(3mm thickness). The distance between laser beam and the material was 10cm for CO2laser and 6.5cm for Nd:YAG laser. Theoretically the melting point of wood is 9345.8°C. But when reaching the temperature of 300 °C, the auto ignition property will ignitethe wood, even in a vacuum. The melting point of pure silver is 961oC. Nor CO2 laserneither Nd:YAG laser could not drill silver even at maximum power for them, but itssurface was affected by Nd:YAG laser, where the affected zone color changed.Different powers for CO2 laser were used for different intervals, increasing powerincreasing drilling speed, zone width and depth. The affected zone of wood by 2ndharmonic Nd:YAG was clear more than that affected by CO2, the CO2 laser wouldburn it. Many figures which representing the relations between laser power, hole width,hole depth and drilling speed were obtained by using Matlab 2008 software program