Views: 90 Author: Site Editor Publish Time: 12-14-2021 Origin: Site
Laser cutting machines can now cut stainless steel medium and thick plates, which makes the application of stainless steel medium and thick plates more and more widespread. Of course, if we want to use a laser cutting machine to cut high-quality thick stainless steel, we must pay attention to the process parameter settings of the laser cutting machine. Leapion laser shares 5 points as follows:
The size of the nozzle diameter determines the shape of the gas flow entering the incision, the gas diffusion area, and the gas flow rate, thereby affecting the stability of melt removal and cutting. The air flow entering the incision is large, the speed is fast, and the position of the workpiece in the air flow is proper, the stronger the spraying ability to remove the molten material. The thicker the stainless steel, the larger the nozzle should be used, the larger the proportional valve setting, and the larger the flow rate, can the pressure be ensured and the normal section effect can be cut.
Single and double-layer nozzles: Generally speaking, double-layer nozzles are used for oxidative cutting (the auxiliary gas is oxygen), and single-layer nozzles are used for fusion cutting (the auxiliary gas is nitrogen). However, some lasers have special instructions, whether to use a single layer or a double layer. In this case, follow the laser instructions.
In order to ensure the cutting effect and protect the nozzle from damage, it is necessary to do a coaxial test before cutting to ensure that the nozzle is coaxial with the laser output beam. Test method: Attach the transparent tape to the nozzle outlet end surface, adjust the laser output power to punch, observe whether there is a center hole and the position of the center hole on the transparent tape, adjust the adjustment screw on the handle of the lens cavity synchronously, until the laser is on The hole punched in the scotch tape coincides with the center of the nozzle.
Various auxiliary gases are often used in stainless steel laser cutting processing, such as oxygen, nitrogen, air, etc., using different gas types, the effect of cutting the section is different. Oxygen is a black section, air is light yellow, and nitrogen can keep the original color of stainless steel from being oxidized. Nitrogen is the preferred auxiliary gas for stainless steel cutting.
Recommended oxygen and nitrogen purity:
1) Oxygen
Advantages: high cutting speed, able to cut thick sheets
Purity recommendation: ≥99.999%
2) Nitrogen
Advantages: avoid oxidation of the cutting edge, so the workpiece does not need to be reworked
Purity recommendation: ≥99.995%
The focus is different, and the thickness, material, and quality that can be cut are also different. Different materials and thicknesses need to be adjusted to different focus. Before cutting, the actual zero focus is measured, and the test and analysis of the cutting process parameters can be carried out with the zero focus as the benchmark. The negative defocus is the main process selection direction for stainless steel cutting.
The effect of frequency change on stainless steel thick plate cutting: the frequency is reduced from 500-200Hz, the cutting section effect becomes finer, and the layering gradually improves. When the frequency is set to 100Hz, it cannot be cut and the blue light is reversed. Through frequency change, find the best frequency range. In order to ensure the best cutting section, the number of pulses must be perfectly matched with the energy of a single pulse.
The effect of duty cycle change on stainless steel thick plate cutting: duty cycle 53% is the critical value. If you continue to reduce the duty cycle, there will be traces of incomplete cutting on the lower surface, the duty cycle will increase to 60%, and the section will become rough and layered. Obviously, the cut surface is yellow.
The pulse duty cycle refers to the proportion of the beam irradiation time in each pulse. The frequency is the number of times the peak power occurs in a pulse, and the duty cycle is the ratio of the peak power to the power in a pulse.
If you want to know other information and professional questions about the laser cutting machine, welcome to consult Leapion Laser.
