Nowadays, Shenzhen laser cutting processing technology is popular in the market. It is very popular among consumers. Among them, metal laser seven is a common laser cutting processing method. How much do you know about it? How to deal with it? Let’s take a look at our Shenzhen laser cutting factory.
1, melt cutting
When the incident laser beam power density exceeds a certain value, the inside of the material at the beam irradiation point begins to evaporate, forming a hole. Once such a small hole is formed, it will absorb the incident beam energy as a black body. The aperture is surrounded by a molten metal wall, and then a secondary auxiliary gas stream coaxial with the beam carries away the molten material around the hole.
As the workpiece moves, the small holes are simultaneously traversed in the cutting direction to form a slit. The laser beam continues along the front of the slit. The molten material is blown away from the slit continuously or pulsatingly.
2, control fracture cutting
For brittle materials that are easily damaged by heat, high-speed, controlled cutting by laser beam heating is called controlled fracture cutting. The main content of this cutting process is that the laser beam heats a small area of brittle material, causing a large thermal gradient and severe mechanical deformation in the area, causing the material to form cracks. As long as a balanced heating gradient is maintained, the laser beam can direct the crack to occur in any desired direction.
This controlled fracture cut is not suitable for cutting acute and angular slits. Cutting a large closed shape is also not easy to succeed. Control the fracture cutting speed is fast, do not need too high power, otherwise it will cause the surface of the workpiece to melt and destroy the edge of the slit. The main control parameters for laser cutting are laser power and spot size.
3, vaporization cutting
Under the heating of the high power density laser beam, the speed at which the surface temperature of the laser cutting material rises to the boiling point temperature is so fast that it avoids the melting caused by heat conduction, so that some of the material vaporizes into steam and some of the material is ejected. The material is assisted from the bottom of the slit and the gas stream is blown away. Some materials that cannot be melted, such as wood, carbon materials and certain plastics, are cut and formed by this vaporization cutting method.
During the vaporization and cutting process, the steam carries away the molten particles and washes the debris to form holes. During the vaporization process, approximately 40 percent of the material is vaporized and 60 percent of the material is removed by the gas stream in the form of droplets.
4, oxidative melting cutting
Laser cutting processing melt cutting generally uses an inert gas. If it is replaced by oxygen or other reactive gas, the material is ignited under the irradiation of the laser beam, and a strong chemical reaction with oxygen generates another heat source called oxidative melting cutting.