Focus relationship in laser cutting machine processing

In laser cutting processing, the position of the laser focus is very important. To a large extent, it affects the cutting accuracy of the workpiece. We need to use different focus modes to process different workpieces with laser cutting machines, which can give full play to the performance advantages of laser cutting machines. There are 3 focal relationships for laser cutting machines:

1. The cutting focus is on the workpiece

In this way, we have also become a negative focal length, the way used when laser cutting machines cut stainless steel, galvanized sheets and other workpieces. Because the focus is on the upper surface of the workpiece, the cut is smooth near the upper surface, but not smooth near the lower surface.

2, the cutting focus is inside the workpiece

This method also becomes a positive focal length. When the workpiece you need to cut is stainless steel or aluminum steel plate, the mode that the cutting point is inside the workpiece is often used. But one disadvantage of this method is that due to the focus principle of cutting the surface, the cutting width is relatively larger than the cutting point on the surface of the workpiece. At the same time, the cutting airflow required in this mode is larger, the temperature is sufficient, and the cutting and piercing time is slightly longer. So when you choose the material of the workpiece is mainly stainless steel or aluminum with high hardness, choose it.

3, the cutting focus is on the surface of the workpiece

This method also becomes 0 focal length, which is generally used when cutting workpieces such as SPC, SPH, SS41, etc. When using, the focus of the cutting machine is selected close to the surface of the workpiece. In this mode, the upper and lower surfaces of the workpiece are different in smoothness. Generally speaking, the cutting surface close to the focal point is relatively smooth, while the lower surface away from the cutting focal point appears rough. This mode should be determined according to the process requirements of the upper surface and the lower surface in the actual application.

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