Several key technologies must be mastered and solved in CO2 1500W laser cutting machine for cutting parts with high precision or large thickness.
Focus position control technology is one of them. One of the advantages of laser cutting is the high energy density of the beam,
so the focal spot diameter is as small as possible in order to produce a narrow slit.
Because the smaller the focal depth of the focusing lens is, the smaller the focal spot diameter is. For high-quality cutting,
the effective focal depth is also related to the lens diameter and the material being cut.
Therefore, it is important to control the position of the focus relative to the surface of the material being cut.
When the focus is in the best position, the slit is the smallest, the efficiency is the highest, and the optimal cutting speed can obtain the best cutting result.
In most applications, the beam focus is adjusted just below the nozzle. The distance between nozzle and workpiece surface is about 1.5mm.
In the process of laser application, there are often problems such as focusing. There are three simple methods to determine the focus position:
(1) Printing method: the cutting head moves from the top down, and the laser beam is printed on the plastic plate, and the smallest diameter is the focus.
(2) oblique plate method: with the vertical axis into an Angle oblique plastic plate so that the horizontal pull, looking for the minimum laser beam as the focus.
(3) blue spark method: remove the nozzle, blowing air, the pulse laser hit on the stainless steel plate, so that the cutting head moves from top to bottom, until the blue spark is the focus.
