Large Power Laser Cutting
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Main features of laser cutting
Source: | Author:pmt22d4f9 | Publish time: 2018-12-12 | 4 Views | Share:

Main characteristics
Small deformation of the slit
The laser beam is focused into a small spot that achieves a high power density at the focus. At this time, the heat input by the beam far exceeds the portion that is reflected, conducted or diffused by the material, and the material is quickly heated to a degree of vaporization to evaporate to form a hole. As the beam moves relatively linearly with the material, the holes are continuously formed into slits of narrow width. The trimming is minimally affected by heat and there is essentially no deformation of the workpiece.
An auxiliary vapor body suitable for the material to be cut is also added during the cutting process. The steel is cut with oxygen as the auxiliary vapor and the molten metal to generate an exothermic chemical reaction to oxidize the material, while helping to blow away the slag in the slit. A type of plastic for cutting polypropylene uses compressed air, and flammable materials such as cotton and paper are cut to use an inert gas. The auxiliary vapor entering the nozzle also cools the focusing lens, preventing smoke from entering the lens holder and contaminating the lens and causing the lens to overheat.
Most organic and inorganic materials can be laser cut. In the metal processing industry where industrial manufacturing systems are heavily weighted, many metal materials, regardless of their hardness, can be cut without distortion. Of course, for high reflectivity materials such as gold, silver, copper and aluminum alloys, they are also good heat transfer conductors, so laser cutting is difficult or even impossible. Laser cutting without burrs, wrinkles, high precision, better than plasma cutting. For many electromechanical manufacturing industries, modern laser cutting systems controlled by microcomputer programs can easily cut workpieces of different shapes and sizes, which are often preferred over die cutting and molding processes; although they are slower than die punching, However, it has no mold consumption, no need to repair the mold, and saves time for mold replacement, thereby saving processing costs and reducing production costs, so it is more cost-effective to consider.
Contactless processing
The laser beam is focused to form a very small point of action with very strong energy, and its application to cutting has many features. First, the conversion of laser light energy into amazing thermal energy is maintained in a very small area, providing (1) narrow straight edge slits; (2) minimal heat affected zone adjacent to the trim; and (3) minimal local deformation. Secondly, the laser beam does not exert any force on the workpiece. It is a contactless cutting tool, which means (1) the workpiece has no mechanical deformation; (2) no tool wear, and no problem with the conversion of the tool; (3) the hardness of the cutting material does not need to be considered. That is, the laser cutting ability is not affected by the hardness of the material to be cut, and any hardness material can be cut. Thirdly, the laser beam is highly controllable and has high adaptability and flexibility. Therefore, (1) it is convenient to combine with the automation equipment, and it is easy to automate the cutting process. (2) Since there is no restriction on the cutting workpiece, the laser beam has an infinite imitation. Shape cutting ability; (3) combined with the computer, the whole board can be discharged, saving materials.
Adaptability and flexibility
Laser cutting has greater flexibility than other conventional processing methods. First, as with other thermal cutting methods, as a thermal cutting process, other methods cannot act as a laser beam on a very small area, resulting in a wide slit, a large heat affected zone, and significant workpiece deformation. Lasers can cut non-metals, while other thermal cutting methods do not.
In general, laser cutting quality can be measured by the following six criteria.
1. Cutting surface roughness Rz
2. Cutting slag size
3. Trimming verticality and slope u
4. Cutting edge rounded size r
5. After the stripe dragged n
6. Flatness F

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