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Analyze How To Control The Cutting Quality Of Laser Cutting Machine
Nov 03, 2017

Many companies are very concerned about the use of laser cutting machine: how to use laser cutting machine to produce good quality workpieces

Now let's talk about how to control the cutting quality of laser cutting machine.

1. Effect of cutting speed on cutting quality

For a given laser power density and material, the cutting speed is in accordance with an empirical formula, as long as the material above the threshold value, the cutting speed and laser power density is proportional to increase the power density can increase the cutting speed. The power density referred to here is related not only to the laser output power but also to the beam quality mode. In addition, the characteristics of the beam focusing system, that is, the size of the focused spot, also have a significant impact on laser cutting.

The cutting speed is inversely proportional to the density (specific gravity) and thickness of the material being cut. When other parameters remain the same, the factors that increase the cutting speed are: increasing the power (within a certain range, eg 500-2000W); improving the beam mode (eg from high order mode to low order mode up to TEM00); decreasing the spot size Such as focusing with short focal length lenses); cutting materials with a low initial evaporative energy (such as plastic, plexiglass, etc.); cutting low density materials (such as white pine, etc.); cutting thin materials.

2. Effect of focus position adjustment on cutting quality

Since the laser power density has a great influence on the cutting speed, the choice of lens focal length is an important issue. The focal spot size of the laser beam is proportional to the focal length of the lens. When the beam is focused by the short focal length lens, the spot size is very small and the power density at the focal point is very high, laser cutting machine which is very good for material cutting. However, its disadvantage is that the focal depth is very short and the margin is adjusted Small, generally more suitable for high-speed cutting thin material. As the telephoto lens has a wider focal depth, as long as enough power density, more suitable for cutting thick workpieces.

3. Influence of Auxiliary Gas Pressure on Cutting Quality

Under normal circumstances, cutting materials require the use of auxiliary gas, the main problem involves the type of auxiliary gas and pressure. Normally, an auxiliary gas is ejected coaxially with the laser beam to protect the lens from contamination and blow away slag from the bottom of the cutting zone. For non-metallic materials and some metallic materials, laser cutting machine use compressed air or inert gas to treat the molten and evaporated materials while suppressing over-burning in the cutting area.

4. Effect of laser output power on cutting quality

For continuous wave output lasers, the laser power and the size of the model will have a significant impact on cutting. In practice, higher power is often set to achieve higher cutting speeds or to cut thicker material. However, the beam pattern (the distribution of the beam energy in the cross-section) is sometimes more important and, as the output power increases, the pattern often slightly deteriorates. Often can be found under the conditions of less than high power but get higher power density, and get better cutting quality. During the entire effective working life of the laser, the patterns are not consistent. The condition of the optics, laser cutting machine the subtle changes in the working mixture of the laser, and the fluctuations in the flow rate all affect the mode mechanism.

In summary, although the factors affecting the laser cutting are more complex, the cutting speed, focus position, assisting gas pressure and laser power and mode structure are four very important variables. In the cutting process, laser cutting machine if found cutting quality significantly worse, we must first check the above discussed factors and timely regulation.