Several important factors affecting the cutting precision of customized 532nm laser

The principle of laser cutting is to melt and evaporate the workpiece by the energy released when the laser beam is irradiated on the surface of the workpiece to achieve the purpose of cutting and engraving. Cutting accuracy is an important part of measuring the processing effect of a laser cutting machine, but the laser cutting accuracy does not entirely depend on the equipment itself, but is composed of many factors. Among them, several important factors affecting the accuracy of laser cutting processing:

Several important factors affecting the accuracy of laser cutting

1: The size of the spot after the laser beam passes through the focus: the smaller the spot after the laser beam is concentrated, the higher the laser cutting processing accuracy, especially the smaller the slit, the smallest spot can reach 0.01mm.

2: The positioning accuracy of the worktable determines the repeatability of the laser cutting process. The higher the worktable accuracy, the higher the cutting accuracy.

3: The greater the thickness of the workpiece, the lower the accuracy and the greater the slit. Since the laser beam is tapered, the slit is also tapered, and the thickness of 0.3mm material is much smaller than the slit of 2mm.

4: The material of the workpiece has a certain influence on the laser cutting accuracy. In the same situation, the cutting accuracy of different materials is slightly different, even if it is the same material, if the composition of the material is different, the cutting accuracy will be different.

So, how can high precision be achieved during laser cutting? After years of practice, several key technologies to improve the accuracy of laser cutting have been summarized:

One is the focus position control technology. The smaller the focal depth of the focusing lens, the smaller the focal spot diameter, so it is very important to control the position of the focal point relative to the surface of the material to be cut.

The second is cutting perforation technology. Any kind of thermal cutting technology, except for a few cases, which can start from the edge of the board, generally a small hole must be drilled in the board. Earlier on the laser punching compound machine, a punch was used to punch out a hole, and then a laser was used to start cutting from the small hole.

The third is the nozzle design and air flow control technology. When laser cutting steel, oxygen and a focused laser beam are shot through the nozzle to the material to be cut, thereby forming an air stream. The basic requirement for the air flow is that the air flow into the incision should be large and the speed should be high, so that enough oxidation makes the incision material fully carry out the exothermic reaction; at the same time, there is enough momentum to spray the molten material out.

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 Laser cutting has no burrs and high precision, which is better than plasma cutting

Laser cutting has no burrs and high precision, which is better than plasma cutting. For many electromechanical manufacturing industries, because the modern laser cutting system of the microcomputer program can easily cut workpieces of different shapes and sizes (the drawing of the workpiece can also be modified), it is often preferred to the punching and molding process; despite its processing speed It is slower than die punching, but it has no mold consumption, no need to repair molds, and save time for mold replacement, thereby saving processing costs and reducing product costs, so it is more economical in general. This is why it is so popular.