In the heavy metal processing industry, many metal materials, regardless of their hardness, can be cut without deformation. Of course, for materials with high reflectivity, such as gold, silver, copper and aluminum alloys, they are also good heat transfer conductors, so laser cutting is very difficult, or even impossible. From the perspective of the laser cutting machine itself, too fast speed will increase the wear of the belt and synchronous pulley. The speed of the laser cutting machine varies with the following factors: beam power, beam mode, spot size, material density, energy required to start gasification and material thickness.
Is there a relationship between the speed and effect of the laser cutting machine?
In the process of laser cutting, the most perfect solution can be obtained only by combining the structural design of the cutting machine and the accuracy requirements of cutting materials. In the process of steel cutting, oxygen is used as an auxiliary material to generate exothermic chemical reaction oxidation between steam and molten metal. At the same time, it can also blow away the slag in the cutting seam. Use compressed air when cutting polypropylene and inert gas when cutting cotton, paper and other flammable materials. The auxiliary steam entering the nozzle can also cool the focusing lens, preventing smoke from entering the lens base to pollute the lens and cause overheating of the lens.
Laser cutting has no burr, no wrinkle, high precision and is superior to plasma cutting. When the cutting speed of the fiber laser cutter is too fast, the end time of the laser beam and the material to be cut is too short. Due to the cutting effect and insufficient cutting energy, the cutting material cannot be cut. For many mechanical and electrical manufacturing industries, modern laser cutting systems controlled by computer programs can easily cut workpieces of different shapes and sizes, so they are generally preferable to stamping and molding processes; Although the processing speed of laser cutting is slower than that of the die, it has no die consumption, does not need to repair the die, and saves the time to replace the die, thus saving the processing cost and reducing the production cost, so it is more cost-effective on the whole. When the cutting speed of the laser cutting machine is too slow, the cutting energy per unit area is too strong, and the interaction time between the material and the laser increases, combustion will occur.
Is there a relationship between the speed and effect of the laser cutting machine?
When the cutting speed is too low, because the cutting position is the anode of the plasma arc, in order to maintain the stability of the arc itself, the anode point or anode area must find the electric arc at the conductive current position near the cutting joint closest to the cutting joint. At the same time, it transfers more heat to the radial direction of the jet, thus expanding the incision. The molten materials on both sides of the incision gather and solidify at the bottom edge, forming a slag that is difficult to clean, And the upper edge of the notch is rounded due to excessive heating and melting.
By properly increasing the cutting speed, the quality of the cut can be improved, that is, the cut is slightly narrower, the surface of the cut is smoother, and the deformation can be reduced at the same time. When the speed is very low, the arc will even be extinguished because the notch is too wide. Therefore, good cutting quality and cutting speed are inseparable. The cutting speed is too fast to make the cutting linear energy lower than the required value. The jet in the cutting seam can not immediately blow away the molten cutting melt and form a large amount of resistance. As the slag hangs on the notch, the surface quality of the notch decreases.
In fact, the choice of cutting speed of fiber laser cutting machine is also very important. The best cutting speed range can be selected according to the equipment description or determined by testing. Due to the thickness of the material, different materials, melting point, thermal conductivity and surface tension after melting, the cutting speed will also change accordingly.
