What are the focal positions of the laser cutting machine? What is the difference?

Hongte plate and tube integrated laser cutting machine

Laser cutting uses a focused high-power density laser beam to irradiate the workpiece, so that the material is quickly heated to vaporization temperature, and evaporates to form holes. As the beam moves on the material, the holes continuously form a narrow width (Such as about 0.1mm) cut seams to complete the cutting of the material.

There is no contact between the torch and the workpiece during laser cutting, and there is no tool wear. To process parts of different shapes, there is no need to change the 'toolThe laser cutting process has low noise, low vibration and no pollution. Compared with other thermal cutting methods, laser cutting has the general characteristics of fast cutting speed and high quality.

So, what are the focal positions of the laser cutting machine? What are the differences? Today, Lixing Laser Editor will talk about the three focal relationships of the laser cutting machine.

Analysis of focus position and difference of laser cutting machine:

Laser cutting can be divided into four categories: laser vaporization cutting, laser melting cutting, laser oxygen cutting and laser scribing and controlled fracture. Laser cutting is one of the thermal cutting methods. The laser cutting machine is a technological revolution in sheet metal processing, and it is the 'processing center' in sheet metal processing; the laser cutting machine has high flexibility, fast cutting speed, high production efficiency, and short product production cycle. It has won a wide range of customers market.

1. The focal position of the laser cutting machine is on the surface of the workpiece

This is the most common focal position, also known as zero focal length. It is often used to cut SPC/SPH/SS41 and other workpieces. When using it, let the focus of the laser cutting machine be close to the surface of the workpiece. In this focus position, due to the slight difference in the smoothness of the upper and lower surfaces of the workpiece, the cut surface of the side close to the focus will often be smoother. Conversely, the cut surface of the side far away from the focus will be rougher. In actual use, It is often determined according to the different process requirements of the upper and lower surfaces.

2. The focal position of the laser cutting machine is inside the workpiece

The focal position is called the positive focal length inside the workpiece, and it is generally the focal mode used when cutting stainless steel or aluminum steel plate, so that the cutting focus is located inside the workpiece. The main disadvantage is that the cutting range is relatively large, and this mode often requires more powerful cutting airflow, sufficient temperature, and longer cutting and piercing time. Therefore, it should only be used when cutting harder materials such as stainless steel or aluminum.

3. The focal position of the laser cutting machine is above the workpiece

The focal position on the workpiece is called negative focal length, because the position of the cutting point is neither on the surface nor inside the workpiece, but is positioned above the cutting material. When the focus position is on the workpiece, it is because the thickness of the plate is relatively high. If the focus is not positioned in this way, it may cause insufficient oxygen delivered by the nozzle, which will cause the cutting temperature to drop and the material cannot be cut. But there is a significant disadvantage that the cutting surface is rough, which is not suitable for precision cutting.

The above is the focus position and difference analysis of the laser cutting machine. In the process of using the laser cutting machine, different focus modes can be selected according to the processing needs of different workpieces, which can give full play to the performance advantages of the laser cutting machine , To ensure the cutting effect. The laser uses material excitation to generate light. This kind of light has a strong temperature. When it contacts the material, it can quickly melt on the surface of the material to form a hole. According to the movement of the alignment point, the cutting is formed. Therefore, this kind of Compared with the traditional cutting method, the cutting method has a smaller gap and can save most of the material. However, the analysis is defined according to the cutting effect. According to the material cut by the laser, the cutting effect can be satisfied and the accuracy is high, which is inherited The advantages of lasers are not comparable to ordinary cutting methods.

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