Corte a laser de placas grossas: métodos e habilidades de depuração

Laser cutting of thick plates: debugging methods and skills

Stainless steel plates are a popular material among users in various industries. Products made from stainless steel plates have excellent performance and a relatively long service life. This makes them widely used in machine manufacturing, construction engineering, kitchenware manufacturing, railway vehicles and other industries.

Nowadays, most manufacturers opt for laser cutting when it comes to stainless steel sheets. However, cutting high-quality thick stainless steel sheets requires certain skills.

I. Debugging method of thick stainless steel sheet cutting

Stainless steel thick plate cutting debugging method

II. Nozzle selection

The diameter of the nozzle determines the shape of the air flow in the incision, the gas diffusion area and the gas flow rate. These factors can affect both the removal of melt material and the stability of the cutting process.

Greater airflow into the incision can result in faster speeds and, when combined with proper positioning of the part within the airflow, can increase the jet's ability to remove molten material.

For thicker stainless steel, a larger nozzle diameter and higher air pressure setting are recommended. It is important to ensure that the pressure and flow are balanced to obtain a normal cross section.

nozzle selection

Note: Air pressure at a fixed flow rate and different nozzle sizes

When cutting thicker stainless steel, a larger nozzle size must be used, along with a larger proportional valve setting and flow rate to maintain the required pressure and achieve a normal cross-section effect.

To ensure the cutting effect and protect the nozzle from damage, a coaxial test is required before the cutting process. This involves testing the alignment of the nozzle and laser output beam to ensure they are coaxial.

Here is a suggested testing method: attach a transparent paper to the surface of the nozzle output end, adjust the laser output power for drilling, observe whether there is a central hole on the transparent tape paper and the position of the central hole, and then simultaneously, adjust the adjustment screw on the mirror cavity handle until the laser-drilled hole in the clear paper tape coincides with the center of the nozzle.

coaxial testing before cutting process

III. Frequency adjustment

The effect of frequency change on stainless steel sheet cutting: when the frequency decreases from 500 to 200 Hz, the effect of the cutting cross section becomes thinner and the stratification slowly improves. However, if the frequency is set to 100 Hz, the material cannot be cut and becomes anti-blue light.

By changing the frequency, it is possible to identify the ideal frequency range for cutting.

To ensure the best cutting cross section, it is essential to ensure that the number of pulses and single pulse energy match perfectly.

Frequency adjustment
Frequency 500Hz 400Hz 300Hz 200Hz
Duty ratio 55% 55% 55% 55%

4. Service fee adjustment

When cutting stainless steel plates, it is crucial to properly adjust the working ratio. A tax rate of 53% is considered the critical value. If the service rate decreases beyond this point, uncut marks may appear on the bottom surface, the section may become rough, and delamination may occur. On the other hand, increasing the service rate to 60% may cause the cutting surface to turn yellow.

Service fee adjustment
Frequency 200Hz 200Hz 200Hz 200Hz
Duty ratio 52% 53% 55% 60%

V. Focus selection

Thickness, material and cut quality may vary depending on the focus chosen.

It is necessary to adjust the focus according to the material and thickness to be cut.

To quickly determine the ideal cutting focus, it is recommended to measure the actual zero focus before cutting and then refer only to the cutting process parameters.

Frequency 200Hz 200Hz 200Hz 200Hz
Duty ratio 52% 53% 55% 60%

Note: The above method is for parameter debugging, but the specific value needs to be determined based on the laser power and the thickness of the plates.

SAW. M yriawatt Laser and effects of cutting thick stainless steel

Focus selection

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