Stainless steel is a common metal material in daily life, and cutting is definitely used to process stainless steel raw materials. Currently, the most suitable method for cutting stainless steel is laser cutting.Laser cutting machine uses a focused high-power density laser beam to irradiate a workpiece, causing the irradiated material to melt. At the same time, it uses high-speed gas in the same direction and coaxial direction to blow away the molten material, thereby achieving the purpose of cutting the workpiece.
The influencing factors on the laser cutting effect of stainless steel include cutting height, nozzle model, focal position, cutting power, cutting duty cycle, cutting pressure, and cutting speed. Hardware conditions include: protective lenses, gas purity, plate quality, focusing and collimating mirrors.
1.Check relevant parameters and hardware conditions
Relevant parameter adjustment: When cutting stainless steel, the cutting height should be adjusted to between 0.8mm and 1.2mm. If the actual cutting height is not accurate, it needs to be calibrated. Select the appropriate nozzle size and model based on the thickness of stainless steel, and check the cutting head nozzle for damage and normal roundness before cutting. Finally, adjust the cutting parameters.
Check the hardware conditions. It is recommended to use a cutting nozzle with a diameter of 1.0 for optical center inspection. When checking the optical center, the focus should preferably be between -1 and 1. The light spots produced in this way are small and easy to observe. Check whether the protective lenses are clean and require no water, oil, or residue. Sometimes, fogging of the protective lenses may occur due to weather or cold auxiliary air.
2.Problems encountered in laser cutting of stainless steel and their solutions
When cutting, there may be hanging slag. If only hanging slag on the corner, the corner rounding can be considered first. In terms of parameters, the focus can be reduced and the air pressure can be increased. If the overall hard slag is hung, it is necessary to reduce the focus, increase the air pressure, and increase the cutting nozzle. However, if the focus is too low or the air pressure is too high, it can cause stratification and roughness of the cross-section. If there is granular soft slag hanging on the whole, the cutting speed can be appropriately increased or the cutting power can be reduced. Hang slag on the end of cutting stainless steel, check if the gas supply is insufficient and the gas flow cannot keep up.
Problems such as insufficient brightness of the thin plate section and rough section of the thick plate during cutting. To achieve a bright cross-section, the first step is to ensure that the surface of the board is free of rust, paint, and oxide film. Secondly, the oxygen purity should be at least 99.5% high. When cutting, a small nozzle with a double layer of 1.0 or 1.2 is required. The cutting speed should exceed 2m/min, and the cutting pressure should not be too high. To achieve good cutting quality for thick plates, the first step is to ensure the purity of the plate and gas, followed by the selection of nozzles. The larger the aperture, the better the quality of the section, but at the same time, the greater the taper of the section.
