Classification and characteristics of 2000w fiber laser machine for metal cutting
(1) the principle of laser cutting
Laser cutting is the use of focused high power density laser beam irradiation of the workpiece, so that the irradiated material quickly melting, gasification, ablation or reach the ignition point, at the same time with the coaxial high-speed airflow and light beam blowing molten material, so as to achieve the workpiece cut. Laser cutting is one of the thermal cutting methods.
(2) classification of laser cutting
1) gasification cutting
High energy density laser beam is used to heat the workpiece. It vaporizes in a short time to form steam. Make a cut in the material. The gasification heat of materials is generally very large, so the laser gasification cutting needs large power and power density.
Laser gasification cutting is mainly used for cutting extremely thin metal materials and non-metal materials (such as paper, cloth, wood, plastic and rubber, etc.).
2) melt cutting
Laser melting cutting, with laser heating metal material melting, nozzle blowing non-oxidizing gas (Ar, He, N, etc.), rely on the strong pressure of gas liquid metal discharge, the formation of incision. It requires only one-tenth the energy of vaporized cutting.
Laser melting cutting is mainly used for the cutting of some materials or active metals that are not easy to oxidize, such as stainless steel, titanium, aluminum and its alloys.
3) Oxygen cutting
It is to use laser as a preheating heat source, with oxygen and other active gas as cutting gas. On the one hand, the gas sprayed out acts with the cutting metal, producing oxidation reaction and releasing a lot of oxidation heat; On the other hand, the molten oxides and melts are blown out from the reaction zone, and the cutting speed is far greater than the laser vaporization cutting and melting cutting.
Laser oxygen cutting is mainly used for carbon steel, titanium steel and heat treatment steel and other easy to oxidize metal materials.
4) Scribing and control fracture
Laser scribbling is the use of high energy density laser scanning on the surface of brittle material, so that the material is heated to evaporate into a small groove, and then apply a certain pressure, brittle material will crack along the small groove. Laser scribing lasers are generally Q-switched lasers and CO2 lasers.
Controlled fracture is the use of steep temperature distributions generated during laser grooving to generate local thermal stress in the brittle material, causing the material to break along the small grooves.