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Laser Cutting Machine One Of The Advantages Is The High Energy Density Of The Beam
Oct 30, 2017

Laser cutting machine equipment as a new type of tools more and more mature application to a variety of industries, including laser cutting machine, laser engraving machine, laser marking machine, laser welding machine. So laser cutting in the end how to use, laser cutting good or bad how to distinguish it?

First, the energy of the laser is concentrated in a dense beam in the form of light, the beam is transmitted to the working surface, producing enough heat to melt the material, and the high-pressure gas with the coaxial beam directly removes the molten metal, thus achieving the purpose of cutting, which shows that the laser cutting process has the essential difference with the machine tool machining.

It is a laser beam emitted from a laser generator, through the optical path system, focusing on high power density laser beam irradiation conditions, laser heat absorbed by the workpiece material, the workpiece temperature rose sharply, after reaching the boiling point, the material began to vaporize and form a hole, with the high pressure of the flow, with the beam and the workpiece relative position of the movement, Finally, the material is formed into a slit. The process parameters (cutting speed, laser power, gas pressure, etc.) and motion trajectory are controlled by the numerical control system, and the slag in the slit is blown by a certain pressure auxiliary gas.

Laser is a kind of light, like other luminous bodies in nature, it is caused by the transition of atoms (molecules or ions) and spontaneous radiation. Although the laser is light, but it is obviously different from the ordinary light is only in the initial very short period of time dependent on spontaneous radiation, the subsequent process is completely determined by the radiation, so the laser has a very pure color, almost no divergence of directionality, very high luminous intensity. Laser at the same time has high coherence, high-intensity, high directivity, laser through the laser generated by the mirror through the mirror to the processing items, so that the processing items (surface) by a strong thermal energy and temperature increased sharply, so that the point because of high temperature and rapid melting or vaporization, With the laser head running track to achieve the purpose of processing. The application of laser processing technology in the advertising industry is divided into: laser cutting, laser engraving two working methods, for each working way, we have some different parts of the operation process.

Laser engraving: Mainly in the surface of the object, divided into bitmap carving and vector carving two kinds:

Bitmap engraving: We first in Photoshop to the engraving of the graphics we need to be processed and converted into monochrome BMP format, and then in the special laser engraving cutting software to open the graphic file. According to the materials we processed, we can set the appropriate parameters, and then click to run, the laser engraving machine will be based on the graphics file produced by the lattice effect of carving.

Vector engraving: Using vector software such as CorelDRAW, AutoCad, Iluustrator and other typesetting design, and the graphics exported to the PLT, DXF, AI format, marking machine, and then use a dedicated laser cutting engraving software to open the graphics file, transmission to the laser engraving machine for processing.

In the advertising industry is mainly applicable to wood, double color plate, plexiglass, color paper and other materials processing.

Several key technologies of laser cutting machine are integrated technology of light, machine and electricity integration.

In laser cutting machine, the parameters of laser beam, the performance and accuracy of the machine and the numerical control system directly affect the efficiency and quality of laser cutting. Especially for the cutting precision or thickness of the larger parts, must master and solve the following key technologies: 1, focus position control technology: Laser cutting the advantages of the beam energy density is high, general 10w/cm2. Since the energy density is proportional to the 4/ΠD2, the focal spot diameter is as small as possible to produce a narrow slit, while the focal spot diameter is proportional to the focal depth of the lens. The smaller the focal depth of focus lens, the smaller the focal spot diameter. But the cutting has the splash, the lens is too close to the workpiece to be possible to damage the lens, therefore general high-power CO2 laser cutting machine industry application widely uses 5〃~7.5〃"(127~190mm) focal length. The actual focal spot diameter is between 0.1~0.4mm. For high quality cutting, the effective depth is also related to the lens diameter and the cut material. For example, with 5〃 lens cut carbon steel, focal depth of +2% range, that is around 5mm. Therefore, it is important to control the focus relative to the position of the surface of the cut material. Concern to the cutting quality, cutting speed and other factors, in principle, 6mm of metal materials, focus on the surface; 6mm of carbon steel, focusing on the surface; 6mm stainless steel, focusing on the surface. The specific size is determined by the experiment.

Laser cutting: We can understand the separation of edges. For such processing purposes, we should first in the CorelDRAW, AutoCAD graphics into the form of vector lines, pneumatic marking machine, and then stored in the corresponding PLT, DXF format, with laser cutting machine operation software to open the file, According to the materials we processed, we can run the parameters such as energy and speed. The laser cutting machine will automatically cut according to the flight route generated by the software after receiving the instruction of the computer. Such as: The existing laser cutting machine, can be based on the computer to draw a good template, and then directly input computer, automatic cutting graphics. The existing laser cutting machine generally has its own hard disk, can enter a huge number of data sources.

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