Laser Cutter in the cutting process, the auxiliary gas is essential! Which we often use oxygen and nitrogen, of course, the higher the purity of the gas, cutting quality will be better. There are many customers want to save the cost of using air cutting, but the cutting process to protect the lens is always water mist, cutting quality is poor, which is why?
First of all, give you universal, the role of auxiliary gas:
1. In order to blow away the residual residue, to achieve the cutting effect.
2. The use of gas to blow away the metal slag while protecting the lens, to avoid slag attached to the lens, affecting the quality of cutting.
3. Can effectively achieve the cutting surface smooth, no burr without hanging residue effect, are fine cut off.
4. Can react with the material to increase the cutting speed, for example, the use of oxygen can achieve the effect of combustion.
So, in order to achieve a better cutting effect, the requirements of the auxiliary gas is relatively high! Although the air can be used as auxiliary gas, but because the air contains water and oil, if not treated, will cause lens contamination, cutting head instability, so that the cutting effect and quality is not up to standard. Therefore, in the use of air cutting, the need for fiber Laser Cutter equipped with cold and dry machine, so that a very good solution to this problem. The cold and dry machine can be forced to cool the compressed air below the required dew point temperature, which will contain a large number of water vapor, oil mist condensed into droplets, separated by gas and liquid, discharged by the drainage machine, the compressed air drying.
Laser cutting section will form a vertical pattern, the depth of the groove determines the roughness of the cutting surface, the more shallow the lines, the more smooth cutting section. Roughness not only affects the appearance of the edge, but also affect the friction characteristics, in most cases, the need to minimize roughness, so the more shallow lines, the higher the quality of cutting.
How the thickness of the sheet metal exceeds 10mm, the vertical margin of the cutting edge is very important. Far away from the focus, the laser beam becomes divergent, depending on the position of the focus, the cutting is widened toward the top or bottom. The cutting edge deviates from the vertical line by a few millimeters, the more vertical the edge, the higher the cutting quality.
3. Cut width
The width of the cut does not generally affect the quality of the cut, and the cutting width has an important effect only when a particularly precise profile is formed inside the part, since the width of the cut determines the minimum internal meridian of the contour. The increase. So want to ensure the same high precision, no matter how much the width of the incision, the workpiece in the Laser Cutter processing area should be constant.
When the slab is cut at high speed, the molten metal does not appear in the incision beneath the vertical laser beam, but is ejected later than the laser beam. As a result, the curved lines are formed at the cutting edges, and the lines follow the moving laser beam. To correct this problem, the feed rate is reduced at the end of the cutting process, and the behavior of the lines can be largely eliminated.
The formation of the burrs determines a very important factor in the quality of the laser cutting, since the removal of the burrs requires additional effort, so the amount of burrs is serious and how much is able to visually determine the quality of the cut.
6. Material deposition
The Laser Cutter touches a layer of oil-containing special liquid on the surface of the workpiece before it begins to melt and pierce. During the cutting process, due to gasification and various materials do not use, customers with wind blowing in addition to the incision, but the upward or downward discharge will also form deposition on the surface.
7. Depression and corrosion
Depression and corrosion have an adverse effect on the surface of the cutting edge, affecting the appearance. They appear in the general should be avoided in the cutting error.
8. Heat affected area
In laser cutting, the area is heated along the area near the incision. At the same time, the structure of the metal changes. For example, some metal will harden. The heat affected area refers to the depth of the area where the internal structure changes.
If the cutting makes the part heated abruptly, it is deformed. This is especially important in fine machining because the contours and connectors here are usually only a few tenths of a millimeter wide. Controlling laser power and using short laser pulses can reduce component heat and avoid deformation.