Parameters you must know when use fiber laser cutting machine
Use of fiber laser cutting machine friends all know that laser cutting effect is aided by pressure, laser power, cutting speed, focus position and cutting parameters. To control the parameters accurately in order to ensure the quality of cutting. So some parameters you must know when use fiber laser cutting machine.
The influence of auxiliary pressure
Laser machining, heat affected zone can blow off gas assisted cutting of slag cooling and cutting. Auxiliary gases include oxygen, compressed air, nitrogen and inert gases. For some metal and non-metallic materials, the general use of inert gas or compressed air can prevent the combustion of materials. This is one main parameter you must know use fiber laser cutting machine.
For example, the cutting of aluminum alloy material. The use of active gas (such as oxygen) for most metal materials is because oxygen can oxidize the metal surface and improve the cutting efficiency. When the auxiliary air pressure is too high. The eddy current on the surface of the material weakens the ability of removing the molten material, resulting in the wide slit and the rough cutting surface. When the air pressure is too low, it can not completely blow away the melt.
And the lower surface of the material will adhere to the slag. Therefore, the auxiliary gas pressure should adjust to get the best cutting quality.
The influence of laser power
The size of laser power has considerable influence on cutting speed, slit width, cutting thickness and cutting quality. The size of required power depends on the characteristics of the material and the mechanism of the cutting. For example, materials with good thermal conductivity, high melting point and high reflectivity on the cutting surface require greater laser power. Generally speaking, under other conditions, there is a laser power that has the best cutting quality in laser cutting.
To further reduce or increase the power, it will cause slagging or over burning, which will lead to the decline of processing quality. This is one main parameter you must know use fiber laser cutting machine
In addition, with the increase of discharge voltage, the intensity of the laser will increase because the input peak power increased. Thus the spot diameter increases, the slit width increases. With the increase of the pulse width, the average power of the laser will increase. Fiber laser cutting width increase. Usually, with the increase of pulse frequency, cutting joint will become wide. When the frequency exceeds a certain value, the kerf width will decrease.
The effect of cutting speed
In laser cutting process, cutting speed has a considerable influence on the quality of cutting material. The cutting speed in the ideal will make the cutting surface take a more stable line, and no slag will appear on the bottom of the material. When the auxiliary gas pressure and laser power, cutting speed and cutting width showed a nonlinear inverse relationship, when the cutting speed is relatively slow, the laser energy to prolong the action time in cutting seam, resulting in kerf width increases, when the speed is too slow, the action of laser beam long workpiece on the cutting and cutting down the difference will be great, cutting quality and production efficiency will be greatly reduced. This is one main parameter you must know use fiber laser cutting machine
With the increase of cutting speed, the action time of laser beam on the workpiece becomes shorter. Which makes the thermal diffusion and heat conduction effect smaller. And the width of the slit decreases. When the speed is too fast, the workpiece material will cut due to lack of cutting heat input appears to cut through the situation. This phenomenon is not completely cut. And the melting material cannot be blown off in time, these will melt the slit welding.
The influence of focus position
The focal point is the distance from the laser focus to the workpiece surface, which directly affects the roughness of the section. The slope and width of the slit and the adhesion status of the molten residue. If the focus position too far ahead, it will be the lower end of the workpiece cutting calories increased.
Cutting speed and auxiliary pressure in certain circumstances. It will cause the material to cut and cut near melted material is liquid flow on the lower surface. After cooling the melted material spherical attach on the lower surface of the workpiece. If the position is lagging behind, material to cut under the surface can absorb heat decreases. So the cutting seam material cannot completely melt in the lower surface of the plates will adhere to some sharp and short residue. This is one main parameter you must know use fiber laser cutting machine
Usually, the focal position should be on the surface of the workpiece or slightly lower. But different material requirements are different. When cutting carbon steel, the cutting quality is better when the focus is on the surface of the sheet. While when the stainless steel cut, the focus should be about 1/2 of the thickness of the sheet.