Now there are many laser cutting machine manufacturers in the market, and the laser cutting machines produced are also different, from the shape to the equipment, are very different. If we want to buy a good laser cutting machine, how should we choose it?
As for the vast laser cutting processing, the evaluation of its processing quality mainly includes the following points:
1. When the laser cutting surface is lubricated, with little texture and no brittle fracture, the marks of molten material will not appear in the cutting under the straight laser beam, but will be sprayed out at the rear of the laser beam. As a result, the zigzag texture is formed at the cutting edge, and the texture closely follows the moving laser beam. To correct this problem, reducing the feed rate at the end of the cutting process can greatly reduce the formation of the texture;
2. The slit width is narrow (this is mainly related to the size of the laser beam spot diameter, depending on the quality of the laser tube). The slit width generally does not affect the cutting quality. When a fine summary is made in the part, the slit width has an important impact. This is because the slit width determines the small diameter of the summary. When the thickness of the plate is added, the slit width will also be added. So if you want the same high precision, no matter how large the cutting width, the workpiece should be stable in the processing area of the laser cutting machine;
3. The straightness of the cutting seam is good, and the heat affected area is small. When the thickness of the processed material exceeds 18 mm, the straightness of the cutting edge is very important; When away from the focus, the laser beam becomes divergent. According to the orientation of the focus, the cut becomes wider towards the top or bottom. The cutting edge is several millimeters away from the straight line of the pen. The straighter the edge is, the higher the cutting quality is;
4. The thermal effect of cutting material, as the application equipment of hot cutting processing, will form a thermal effect on the material in the process of application, which mainly includes three aspects: a. the heat affected area; B. Depression and corrosion; C. The heat-affected area during material deformation refers to the area heated along the cutting edge during laser cutting. Together, the structure of the material itself changes. For example, some materials will harden.
The heat-affected zone refers to the regional change of the internal structure due to high temperature; However, depression and corrosion have a negative impact on the appearance of the cut edge, affecting the appearance. They appear in the cutting error that should be avoided in general; Then if the cutting causes the part to overheat, it will deform.
This is very important in finishing, because the summary and connecting piece here are generally only a few tenths of a millimeter wide. Controlling the laser power and using short laser pulses can reduce the heating of parts and prevent deformation.
It can be seen that it is not easy for a qualified laser cutting machine to pass the test. It is suggested that the buyer should carefully study the characteristics of processing materials before purchasing the equipment, adjust the parameters for cutting, and investigate the quality of samples after cutting.
The above four aspects can be achieved, that is, a qualified laser cutting machine. The detailed tasting in the early stage saves a lot of trouble for the later processing. The buyer should select a large laser equipment manufacturer to purchase the equipment, with after-sales guarantee and processing training.