Stainless steel plate is the favorite material in many fields. Its products have excellent performance in all aspects. It has been widely used in machinery manufacturing, construction engineering, kitchenware manufacturing, rail vehicles and other industries. Nowadays, most stainless steel plates are cut by laser. Cutting high-quality stainless steel plates requires certain skills.
Cutting and adjusting method of stainless steel thick plate
● Nozzle selection: determine the nozzle size and adjust the required air pressure according to the thickness of stainless steel
● Frequency control: input basic parameters and judge whether to increase or decrease the frequency according to the cross-section.
● Duty cycle: Input the basic parameters, and then increase or decrease the duty cycle according to this section.
● Focusing speed: reach the section effect, improve the speed and debug the fastest value.
● Determine parameters: actual production, duty cycle exceeds the critical value, and speed is 90% of the limit value.
▲ The frequency of cross-section layering shall be reduced or the positive focus shall be appropriately reduced, while the duty cycle shall be reduced when the cross-section turns yellow;
▲ The increase of frequency and duty cycle can improve the speed, but the effect of section change is layered, and the parameters can be adjusted according to the actual situation to balance the demand.
Nozzle selection
The diameter of the nozzle determines the shape of the air flow entering the notch, the area of gas diffusion and the speed of the air flow, which will affect the discharge of the melt and the stability of the notch. The air flow entering the notch is large and fast, and the position of the workpiece in the air flow is appropriate. The spray has a stronger ability to remove the melt. The thicker the stainless steel, the larger the nozzle diameter, and the higher the air pressure setting. Both pressure and flow rate shall be met to reduce the effect of normal section. The thicker the stainless steel, the larger the nozzle diameter, and the larger the proportional valve setting. Increasing the flow ensures pressure and reduces the effect of normal section. At the same time, in order to ensure the cutting effect and protect the nozzle from damage, coaxial testing is required before cutting to ensure that the nozzle and the laser output beam are coaxial.
Test method: Paste the transparent tape on the end face of the nozzle, adjust the laser output power to drill holes, and observe whether there is a center hole and the position of the center hole on the transparent tape. Adjust the screw on the handle of the mirror chamber until the hole formed by the laser on the transparent tape coincides with the center of the nozzle.
Frequency debugging
The influence of frequency change on stainless steel plate cutting: the frequency decreases from 500-200HZ, the cutting section effect becomes better, and the delamination gradually improves. When the frequency is set to 100HZ, it cannot be cut off, and it is blue. Find the best frequency range by changing the frequency. In order to ensure the best cutting part, the number of pulses must be exactly matched with the energy of a single pulse.
Duty cycle debugging
Effect Duty cycle change on cutting thick stainless steel plate: Duty cycle 53% is the critical value, and duty cycle continues to decrease. When the duty cycle increases to 60% on the lower surface, the section becomes rough with uncut marks, obvious stratification, and the cutting surface turns yellow.
Key selection
Different focal points have different thicknesses, materials and qualities that can be cut. Different materials and thicknesses need to be adjusted for different focal points. Before cutting, please measure the actual zero focus, and then refer to the cutting process parameters to quickly determine the most appropriate cutting focus.