What if the laser cutting machine always hangs slag? The laser cutting machine always hangs slag, which will seriously affect the quality of the cutting workpiece. Many sheet metal processing enterprises will be troubled by such problems. Can cutting machine slagging be solved? How can we achieve the ideal cutting effect?
There are many reasons for slag hanging on the laser cutting machine. Generally, we can consider focus, speed, power, air pressure and other issues. What should we do about the laser cutting machine always hanging slag?
1. Focus position
The focus position is the distance between the laser focus and the workpiece surface, which directly affects the section roughness, the slope and width of the kerf, and the adhesion of the molten residue.. If the focus position is too advanced, the heat absorbed by the lower end of the workpiece to be cut will increase. When the cutting speed and auxiliary air pressure are fixed, the material to be cut and the melted material near the cutting seam will flow as liquid on the lower surface. After cooling, the melted material will adhere to the lower surface of the workpiece as a ball; If the position lags. The heat absorbed by the lower end face of the material to be cut is reduced, so that the material in the cutting seam cannot be completely melted, and some sharp and short residues will be stuck on the lower surface of the plate.
2. Speed
During laser cutting, the cutting speed is determined according to the material and thickness of the cutting plate. Different cutting speeds will have a great impact on the quality of laser cutting. Proper selection of cutting speed can not only improve the efficiency of laser cutting, but also obtain good cutting quality.
3. Power
During laser cutting, the selection of laser power has an impact on the cutting quality. The cutting power should be determined according to the material and thickness of the cutting plate. If the power is too large or too small, a good cutting section cannot be obtained.
4. Pressure
In laser cutting, auxiliary air pressure can blow off the slag and cool the heat affected zone. Auxiliary gas includes oxygen, compressed air, nitrogen and inert gas. For some metal materials and non-metallic materials, inert gas or compressed air is generally used to prevent material burning. Such as cutting of aluminum alloy materials. Active gas (such as oxygen) is used for most metal materials, because oxygen can oxidize metal surface and improve cutting efficiency.
Examples of solutions
Stainless steel
1. Nitrogen pressure and flow (check whether the pressure and flow are normal).
2. The problem of cutting speed (too fast or too slow speed may cause slagging, especially too slow speed may also cause slagging).
3. The focus of laser (the focus position of laser cutting carbon steel and stainless steel is different, the laser cutting nozzle is different, and the lens should also be different).
Adjust the focus according to the plate thickness
The higher the focus, the brighter its cutting surface.
Hard slag hanging on the lower surface: the focus is too high, the speed is too slow, and the air pressure is too low.
The lower the focus is, the rougher its cutting surface is.
Soft slag hanging on the lower surface: the focus is too low, the speed is too fast, the air pressure is too high, and the power is too high.
Inability to cut through: the focus is wrong, the power is too low and the speed is too fast.
