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Views: 12 Author: heyu Publish Time: 02-14-2020 Origin: Site
Many people are buying laser cutting machine or second-hand laser cutting machine, do not know how to judge the quality of laser cutting machine. Generally, the quality and performance of a laser cutting machine are directly determined by the product effect. In fact, this is unscientific, because laser cutting will change according to different materials, cutting speed, cutting effect and cutting power. For laser cutting, which is the best quality of metal laser cutting machine? How to judge the quality of metal laser cutting machine? The idea of small editor is to evaluate its processing quality mainly through the following principles:
1. The cutting surface is smooth without stripe, burr or brittle fracture;
When the metal laser cutting machine cuts the thick plate at high speed, the molten metal will not appear in the incision at the bottom of the laser beam. As a result, the curve formed on the cutting edge closely follows the moving laser beam. To solve this problem, we only reduce the speed at the end of the cutting process, so as to greatly eliminate the generation of striation.
2. The size of the cutting gap;
The slit width is narrow, which is mainly related to the diameter of laser beam spot. Generally speaking, the incision width of metal laser cutting machine does not affect the cutting quality. The cutting width has an important influence, forming a part of a particularly accurate configuration file. This is because the cutting width determines the minimum internal contour. When the thickness of the plate increases, the cutting width will increase. Therefore, in order to ensure the same high accuracy, no matter how wide the cutting width is, the workpiece should be constant in the laser cutting machine processing area.
3. The perpendicularity of the slit is good and the heat affected zone is small;
In general, the section perpendicularity of materials below 5mm cut by metal laser cutting machine may not be the main evaluation factor, but for high-power laser cutting, when the thickness of processed materials exceeds 10 mm, the perpendicularity of cutting edge will become very important. Because away from the focus, the laser beam becomes divergent, and according to the position of the focus, the cutting is widened toward the top or the bottom. The more vertical the edge is, the higher the cutting quality is;
4. No material burning, no melting layer formation, no large slag;
The dross of metal laser numerical control cutting machine is mainly reflected in deposition and cross-section burr. The material is deposited on the surface of the workpiece, as a result of laser cutting, special oil that starts to melt. All kinds of materials do not need to be blown away by the customer's wind. However, if they are discharged up or down, they will form deposition on the surface. The formation of burr is one of the important factors that affect the quality of laser cutting. Because additional work is needed to remove the burr, the severity and quantity of burr can be determined intuitively.
5. Thermal effect of cutting materials
As the application equipment of thermal cutting, metal laser cutting machine is bound to have thermal impact on metal materials in the use process, which mainly includes three aspects:
1. Heat affected area
2. Depression and corrosion;
3. Material deformation
The heat affected area refers to the area near the incision which is heated in laser cutting. At the same time, the metal structure changes. For example, some metals can harden. The heat affected area refers to the depth of the area where the internal structure changes; while the depression and corrosion are cutting.
The surface of the edge has an adverse effect on the appearance. They appear in cutting errors that should normally be avoided; if cutting causes parts to heat up sharply, it will deform. This is particularly important in fine machining, where the profile and connector are usually only a few tenths of a millimeter wide. Controlling the laser power and using short laser pulse can reduce the heat of components and avoid deformation.
6. The surface roughness of incision is the key to evaluate the surface quality of laser cutting.
In fact, for the metal laser cutting machine, there is a direct relationship between the cutting cross-section grain and the roughness, and the poor cutting performance of the cross-section grain will directly lead to higher roughness, but considering the difference in the causes of the two different effects, generally we analyze the metal laser. The machining quality of CNC cutting machine is still analyzed separately. Laser cutting section will form vertical lines, the depth of the lines determines the roughness of the cutting surface, the shallower the lines, the smoother the cutting section. In most cases, it is necessary to reduce the roughness, so the shallower the grain, the higher the cutting quality. leapion
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