What is a metal laser cutting machine ? In fact, it is a machine made of metal and cut by laser technology. This kind of equipment is now used in many places, this equipment uses a laser. Do you know what a laser is? Laser is a kind of very light-emitting beam. Laser can achieve extremely fast cutting in a very short time. Metal cutting machines are very labor-saving and time-saving, so do you know the principle? Let ’s take a look at the classification.
Laser cutting is the use of a focused high power density laser beam to irradiate the workpiece, so that the irradiated material quickly melts, vaporizes, ablates or reaches the ignition point;
At the same time, the molten material is blown out by means of a high-speed airflow coaxial with the light beam, thereby cutting the workpiece. Laser cutting is one of the thermal cutting methods.
Laser cutting can be divided into four categories: laser vaporization cutting, laser melting cutting, laser oxygen cutting, and laser scribing and controlling fracture.
1) Laser vaporization cutting:
High-energy-density laser beams are used to heat the workpiece, causing the temperature to rise rapidly, reaching the boiling point of the material in a very short period of time, and the material beginning to vaporize to form vapor.
These vapors are ejected at a high speed, and when the vapors are ejected, a cut is formed in the material.
The heat of vaporization of materials is generally large, so laser vaporization cutting requires a large power and power density.
Laser vapor cutting is mostly used for cutting very thin metal materials and non-metal materials (such as paper, cloth, wood, plastic, rubber, etc.).
2) Laser melting and cutting:
During laser melting and cutting, the metal material is melted by laser heating, and then the non-oxidizing gas (Ar, He, N, etc.) is sprayed through a nozzle coaxial with the beam;
Relying on the strong pressure of the gas, the liquid metal is discharged to form a cut. Laser melting and cutting do not need to completely vaporize the metal, and the energy required is only 1/10 of that of vaporizing and cutting.
Laser melting cutting is mainly used for cutting of non-oxidizable materials or active metals, such as stainless steel, titanium, aluminum and its alloys.
3) Laser oxygen cutting:
The principle of laser oxygen cutting is similar to oxyacetylene cutting. It uses laser as preheating heat source and active gas such as oxygen as cutting gas.
On the one hand, the sprayed gas interacts with the cutting metal, an oxidation reaction occurs, and a large amount of oxidation heat is released;
On the other hand, molten oxides and melts are blown out of the reaction zone to form cuts in the metal.
Because the oxidation reaction in the cutting process generates a lot of heat, the energy required for laser oxygen cutting is only 1/2 of the melting cutting;
The cutting speed is much faster than laser vaporization cutting and melting cutting. Laser oxygen cutting is mainly used for carbon steel, titanium steel and heat-treated steel and other easily oxidizable metal materials.
4) Laser scribing and controlling fracture:
Laser scribing is the scanning of the surface of brittle materials with a high-energy density laser, which heats the material and evaporates a small groove;
Then applying a certain pressure, the brittle material will crack along the small groove. Laser dicing lasers are generally Q-switched lasers and CO2 lasers.
Controlled fracture is the use of the steep temperature distribution produced by laser engraving grooves, which generates local thermal stresses in brittle materials and breaks the material along small grooves.
The above is the introduction of the principle and classification of metal laser cutting machine. It is a machine that can automatically typeset and can save a lot of materials;
And the material cut out by the metal laser cutting machine is very flat, and its cut is very smooth.
Most processing manufacturers will choose this equipment, which can reduce the manufacturing cost and processing cost of the enterprise.
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