How to judge the product quality of Hypertherm table plasma cutting machine and gantry plasma cutting machine? In modern society, the use of numerical control is becoming more and more common, and it has also brought great changes to our modern life. There is no unified standard for cutting quality evaluation of CNC plasma cutting machine. So far, there is no NC cutting quality standard in China and ISO9000 series quality assurance methods provided by UE. The NC cutting standards and standard sample regulations are studied, including: classification of cutting quality, sample standards and sample processing, optical system, type of sample price and beam characteristics.

1. The cutting surface shall be smooth without stripes, burrs and brittle fracture; When the NC plasma cutting machine cuts thick plates at high speed, the molten metal will not appear in the notch at the bottom of the laser beam, but it will be sprayed with the laser beam. As a result, the curve formed on the cutting edge closely follows the moving laser beam. In order to solve this problem, we can only reduce the speed at the end of the cutting process, so as to greatly eliminate the products with lines.

2. Size of cutting gap;

The slit width is narrow, which is mainly related to the diameter of the laser beam spot. Generally speaking, the slit width of CNC Table plasma cutting machine and gantry plasma cutting machine does not affect the cutting quality. The cutting width has an important impact, forming part of a particularly accurate configuration file, because the cutting width determines the interior with the smallest 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 machining area of the NC cutting machine.

3. Good perpendicularity of cutting joint and small heat affected zone; Generally, the section perpendicularity of materials below 5mm cut by NC plasma cutting machine may not be the most important evaluation factor, but for high-power plasma cutting, when the thickness of processed materials exceeds 10mm, the perpendicularity of cutting edge will become very important. Because when it is far away from the focus, the laser beam becomes divergent, and the cutting becomes wider towards the top or bottom according to the position of the focus. The cutting edge deviates from the vertical line by a few percent. The more vertical the edge is, the higher the cutting quality is.

4. No material combustion, no melting layer formation and no large slag; The slag hanging of table plasma cutting machine and gantry plasma cutting machine is mainly reflected in the deposition and section burr. The material is deposited on the surface of the workpiece as the result of NC cutting and begins to melt the special oil. Gasified and various materials do not need to be blown away by the customer. However, discharge upward or downward will also form deposition on the surface. Burr formation is one of the important factors affecting the quality of laser cutting. Due to the need for additional work to eliminate burr, the severity and amount of burr can directly determine the cutting quality.

5. Thermal impact of cutting materials NC plasma cutting machine, as an application equipment for thermal cutting processing, is bound to have a thermal impact on metal materials in the process of use, which mainly includes three aspects:

1) heat affected area; 2) Depression and corrosion; 3) Material deformation

The heat affected area refers to the area heated along the notch in laser cutting. At the same time, the structure of the metal changes. For example, some metals harden. Heat affected area refers to the depth of the area where the internal structure changes; It has an adverse effect on the appearance of cutting edges and dents. They appear in cutting errors that should be avoided in general; Finally, if the cutting causes the part to heat sharply, it will deform. This is particularly important in fine machining because the contours and connecting pieces are usually only a few tenths of a millimeter wide. Controlling laser power and using short laser pulses can reduce component heating and avoid deformation.

6. The notch surface is rough, and the surface roughness is the key to measure the surface quality of NC cutting. In fact, for the NC plasma cutting machine, the cutting section texture is directly related to the roughness. Often, the poor cutting performance of the section texture will also directly lead to the high roughness. However, considering the different causes of the two different effects, we generally analyze the processing quality of the metal laser NC cutting machine separately. The NC cutting section will form vertical lines, and the depth of the lines determines the roughness of the cutting surface. The shallower the lines, the smoother the cutting section. Roughness not only affects the appearance of the edge, but also affects the friction characteristics. In most cases, it is necessary to reduce the roughness, so the shallower the grain, the higher the cutting quality.

In addition to the above six principles, the state and final forming of the molten layer in the cutting process of table plasma cutting machine and gantry plasma cutting machine also directly affect the above processing quality evaluation indexes. Relatively speaking, the smaller the thickness of the metal cutting workpiece, the higher the roughness of the cutting surface.