The parameters of laser cutting machines are very important and directly affect the quality and effectiveness of cutting. So, how do you view these professional performance parameters when purchasing a laser cutting machine?

1. Effect of auxiliary air pressure

In the laser cutting process, the auxiliary air pressure can blow off the slag in the cutting process and cool the Heat-affected zone. Auxiliary gases include oxygen, compressed air, nitrogen, and inert gases. Inert gases or compressed air are commonly used for some metallic and non-metallic materials to prevent material combustion. For example, cutting aluminum alloy materials. Active gases (such as oxygen) are used in the vast majority of metal materials because oxygen can oxidize metal surfaces and improve cutting efficiency. When the auxiliary air pressure is too high, eddy currents appear on the surface of the material, weakening the ability to remove molten materials, leading to widening of the cutting seam and rough cutting surface; When the air pressure is too low, the molten material cannot be completely blown away, and slag will adhere to the lower surface of the material. Therefore, the auxiliary gas pressure should be adjusted during the cutting process to obtain the best cutting quality.

2. The impact of laser power

The size of laser power has a significant impact on cutting speed, seam width, cutting thickness, and cutting quality. The amount of power required depends on the characteristics of the material and the cutting mechanism. For example, materials with good thermal conductivity, high melting point, and high cutting surface reflectivity require higher laser power. Under other conditions,

Laser cutting machines have laser power to achieve the best cutting quality during the processing process. Further reduction or increase in power can lead to slag deposition or overburning, leading to a decrease in processing quality.

In addition, as the discharge voltage increases, the laser intensity will increase due to the increase in input peak power, thereby increasing the diameter and width of the light spot; As the pulse width increases, the average laser power and laser cutting width; Usually, as the pulse frequency increases, the cutting width decreases.

3. Impact of cutting speed

In laser cutting processing, cutting speed has a significant impact on the quality of cutting materials. The ideal cutting speed will result in a relatively stable line on the cutting surface, and there will be no slag in the lower part of the material. When the auxiliary air pressure and laser power are constant, the cutting speed and cutting width show a non-linear inverse ratio. When the cutting speed is slow, the laser energy prolongs the cutting time, leading to an increase in cutting width. When the speed is too slow, the laser beam time is too long, resulting in a significant difference in the upper and lower cutting of the workpiece, a decrease in cutting quality, and a significant decrease in production efficiency.

As the cutting speed of the fiber laser cutting machine increases, the action time of the laser beam energy on the workpiece is shortened, thereby reducing the thermal diffusion and conduction effects, and thus reducing the width of the cutting seam. When the speed is too fast, due to insufficient cutting heat input, the material of the cutting workpiece will not be able to be cut. This phenomenon belongs to incomplete cutting, and the melted material cannot be blown off in a timely manner. These molten materials will be re welded to the cutting seam.

4. The influence of focal position

The focus position is the distance between the laser focus and the surface of the workpiece, which directly affects the cross-sectional roughness, slope and width, as well as the adhesion of molten residue. If the focus position is too advanced, it will increase the heat absorbed by the lower end of the cutting workpiece. At a certain cutting speed and auxiliary air pressure, the cutting material and the melted material near the cutting seam flow liquid on the lower surface. After cooling, the melted material will adhere to the lower surface of the workpiece in a spherical shape; If the position lags behind, the heat absorbed by the lower end face of the cutting material will decrease, preventing the material in the cutting seam from completely melting, and some sharp and short residues will adhere to the lower surface of the board. In general, the focus should be on the surface of the workpiece or slightly lower, but different materials require different requirements. When cutting carbon steel, the cutting quality is better when the focus is on the surface of the plate; When cutting stainless steel, the focus should be around 1/2 of the plate thickness.