The parameters of the laser cutting machine are very important. It directly affects the quality and effect of cutting. So, how to look at those professional performance parameters when purchasing a laser cutting machine?

1. Influence of auxiliary air pressure
In the laser cutting process, the auxiliary air pressure can blow off the slag during cutting and cool the heat affected zone of cutting. Auxiliary gases include oxygen, compressed air, nitrogen and inert gases. For some metal materials and non-metal materials, inert gas or compressed air is generally used, which can prevent the material from burning. Such as the cutting of aluminum alloy materials. For most metal materials, reactive gases (such as oxygen) are used, because oxygen can oxidize the metal surface and improve the cutting efficiency. When the auxiliary air pressure is too high, eddy currents appear on the surface of the material, which weakens the ability to remove the melt, resulting in a wider slit and a rough cutting surface; when the air pressure is too low, the melt cannot be completely blown away, and the lower surface of the material will adhere to the surface. scum. Therefore, the auxiliary gas pressure should be adjusted during cutting to obtain the best cutting quality.

2. The effect of laser power
The size of the laser power has a considerable influence on the cutting speed, kerf width, cutting thickness and cutting quality. The amount of power required is determined by the properties of the material and the mechanism of cutting. For example, materials with good thermal conductivity, high melting point and high reflectivity of the cutting surface require higher laser power. Generally, under certain other conditions, there is a laser power to obtain the best cutting quality in the laser cutting process. Further reducing or increasing the power will cause slag or over-burning, which will lead to a decrease in the processing quality.

In addition, with the increase of the discharge voltage, the intensity of the laser will increase due to the increase of the input peak power, so that the diameter of the spot will increase, and the width of the slit will increase accordingly; with the increase of the pulse width, the average power of the laser will increase. When the frequency increases, the width of the laser slit will increase; generally, with the increase of the pulse frequency, the slit will also become wider. When the frequency exceeds a certain value, the slit width will decrease.

3. The effect of cutting speed
In the laser cutting process, the cutting speed has a considerable influence on the quality of the cutting material. The ideal cutting speed will make the cutting surface present a relatively smooth line, and there will be no slag in the lower part of the material. When the auxiliary gas pressure and laser power are constant, the cutting speed and the slit width show a nonlinear inverse relationship. When the cutting speed is relatively slow, the action time of the laser energy in the slit is prolonged, resulting in an increase in the slit width. , When the speed is too slow, the laser beam action time is too long, the difference between the upper slit and the lower slit of the workpiece will be very large, the cutting quality will be reduced, and the production efficiency will be greatly reduced. As the cutting speed increases, the action time of the laser beam energy on the workpiece becomes shorter, so that the thermal diffusion and thermal conduction effects become smaller, and the width of the kerf is correspondingly smaller. When the speed is too fast, the workpiece material to be cut will not be cut through due to insufficient cutting heat input. This phenomenon belongs to incomplete cutting, and the molten material cannot be blown off in time. These melts will cause The kerf is re-welded.

4. Influence of focal position
The focus position is the distance from the laser focus to the surface of the workpiece, which directly affects the roughness of the cut surface, the slope and width of the slit, 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. Under the condition of constant cutting speed and auxiliary air pressure, the material to be cut and the melted material near the slit will flow on the lower surface in a liquid state. After cooling, the melted material will adhere to the lower surface of the workpiece in a spherical shape; if the position lags, the heat absorbed by the lower end face of the material to be cut will decrease, so that the material in the cutting seam cannot be completely melted. Some sharp and short residues will adhere to the surface. Under normal circumstances, the focus position should be on the surface of the workpiece or slightly lower, but different materials have different requirements. When cutting carbon steel, the cutting quality is better when the focus is on the surface of the plate; and when cutting stainless steel, the focus should be on the thickness of the plate. The effect is better when it is about 1/2.