Fiber laser cutting machines generally main purposes
Fiber laser cutting machines generally main purposes:
1) Vaporization cutting
The workpiece heat by a high energy density laser beam to rapidly rise the temperature, reach the boiling point of the material in a very short time. And the material begins to vaporize to form a vapor. Then these vapors eject at a high speed, and a slit form in the material while the vapor eject. So the heat of vaporization of the material is generally large, so a large power and power density require for laser vaporization cutting. Therefore, laser vaporization cutting often use for cutting very thin metal. And non-metallic materials such as paper, cloth, wood, plastics and rubber.
2) Melting cutting
Laser melting and cutting, laser heating to melt the metal material. And then blowing non-oxidizing gas (Ar, He, N, etc.) And through a nozzle coaxial with the beam, relying on the strong pressure of the gas to discharge the liquid metal Form an incision. So laser melt cutting does not require complete vaporization of the metal. And the required energy is only 1/10 of the vaporization cut. Then laser melt cutting mainly use for the cutting of some non-oxidizable materials or active metals. Such as stainless steel, titanium, aluminum and their alloys.
3) Oxygen cutting
The principle of laser oxygen cutting is similar to oxyacetylene cutting. It uses a laser as a preheating heat source and uses an active gas such as oxygen as a cutting gas. On the one hand, the injected gas acts on the cutting metal to cause an oxidation reaction to release a large amount of heat of oxidation. On the other hand, the molten oxide and the melt are blown out from the reaction zone to form a slit in the metal. Since the oxidation reaction during the cutting process generates a large amount of heat, the energy require for laser oxygen cutting is only 1/2 of the melt cutting. And the cutting speed is much larger than the laser vaporization cutting and the melting cutting. Laser oxygen cutting mainly use for easily oxidized metal materials such as carbon steel, titanium steel and heat-treated steel.
4) Laser dicing and control rupture
Laser dicing is to use a high energy density laser to scan the surface of the brittle material. So that the material evaporate by heat to a small groove, and then a certain pressure is applied. And the brittle material will crack along the small groove. open. Lasers for laser scribing are generally Q-switched lasers and CO2 lasers. Controlling the fracture is a steep temperature distribution created by laser engraving, creating local thermal stresses in the brittle material that cause the material to break along the small grooves.