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Factors influencing the cutting quality of laser cutting machine

Views:1     Author:heyu     Publish Time: 2020-05-15      Origin:Leapion fiber laser cutting machine

  The parameters of laser cutting machine are very important, which directly affects the quality and effect of cutting. Then, how to look at those professional performance parameters when choosing a laser cutting machine? Here's how to look at them.

  1. Influence of auxiliary air pressure

  In laser cutting, the 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 and non-metal materials, inert gas or compressed air is generally used to prevent the material from 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. When the auxiliary air pressure is too high, eddy current appears on the surface of the material, which weakens the ability to remove the melt, leading to wider cutting seam and 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 slag. Therefore, the auxiliary gas pressure should be adjusted to get the best cutting quality.

  2. Influence of laser power

  The size of laser power has a considerable impact on cutting speed, cutting width, cutting thickness and cutting quality. The required power is determined by the characteristics of the material and the cutting mechanism. For example, materials with good thermal conductivity, high melting point and high reflectivity of cutting surface need large laser power. Generally, when other conditions are certain, there is a laser power with the best cutting quality in laser cutting. Further reducing or increasing the power will cause slag hanging or overburning, which will lead to the decline of processing quality.

  In addition, with the increase of the discharge voltage, the laser intensity will increase with the increase of the input peak power, so 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, and the width of the slit will increase; Generally, with the increase of pulse frequency, the slit width will also become wider. When the frequency exceeds a certain value, the slit width will decrease.

  3. Influence of cutting speed

  In the laser cutting process, the cutting speed has a considerable impact on the quality of cutting materials. The ideal cutting speed will make the cutting surface present a relatively stable line, and there will be no slag at the bottom of the material. When the auxiliary gas pressure and laser power are fixed, there is a nonlinear inverse relationship between the cutting speed and the slit width. When the cutting speed is relatively slow, the action time of laser energy in the slit is extended, which results in the increase of slit width. When the speed is too slow, the action time of laser beam is too long, the difference between the upper slit and the lower slit of the workpiece will be large, and the cutting quality will be reduced The production efficiency will be greatly reduced. With the increase of cutting speed, the action time of laser beam energy on the workpiece becomes shorter, which makes the thermal diffusion and heat conduction effect smaller, and the width of the slit correspondingly smaller. When the speed is too fast, the cut workpiece material will be cut impervious due to the lack of cutting heat input. This phenomenon belongs to incomplete cutting, and the melted material can not be blown out in time. These molten materials will make the cutting seam re welded.

  4. Influence of focus position

  The focus position is the distance from the laser focus to the workpiece surface, which directly affects the section roughness, the slope and width of the slit and the adhesion of the molten residue. If the focus position is too advanced, it will increase the heat absorbed by the lower end of the workpiece to be cut. When the cutting speed and auxiliary air pressure are fixed, it will cause the material to be cut and the material to be melted near the cutting seam to flow on the lower surface as liquid, and the material to be melted after cooling will stick to the lower surface of the workpiece as a ball; If the position lags behind, the heat absorbed by the lower end face of the material to be cut will be reduced, so that the material in the cutting seam cannot melt completely, and some sharp and short residues will adhere to the lower surface of the plate. Generally, the focus position should be on the workpiece surface or slightly lower, but different material requirements are different. When cutting carbon steel, the cutting quality is better when the focus is on the plate surface; when cutting stainless steel, the effect is better when the focus is about 1 / 2 of the plate thickness.


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