Study the effect of many parameters on the speed of drilling materials by laser beam

الملخص EN

The speed of drilling depends on differ ent parameters suchas power, material, time, distance between drilling tool and the material, the drilling tool, etc.

In this paper; the laser beam was usedas drilling tool.

Two types of lasers wer e used; CO2 laser (10.6µm & 25W) and pulse Nd:YAG laser (1 st harmonic 1064nm &2 nd harmonic 532nm, 1J).

Two differ ent materials wer e used; pur e silver (0.4mm thickness) and beech wood (3mm thickness).

The distance between laser beam and the material was 10cm for CO2 laser and 6.5cm for Nd:YAG laser.

Theor etically the melting point of wood is 9345.8 °C.

But when r eaching the temperature of 300 °C, the auto ignition property will ignite the wood, even in a vacuum.

The melting point of pure silver is 961 o C.

Nor CO2 laser neither Nd:YAG laser could not drill silver even at maximum power for them, but its surface was affected by Nd:YAG laser, where the affected zone color changed.

Differ ent powers for CO2 laser wer e used for differ ent intervals, incr easing power incr easing drilling speed, zone width and depth.

The affected zone of wood by2 nd harmonic Nd:YAG was clear more than that affected by CO2, the CO2 laser would burn it.

Many figur es which r epresenting the relations between laser power, hole width, hole depthand drilling speed were obtained by using Matlab 2008 software program.