What is the impact of the focus position of the fiber laser cutting machine on metal cutting?

Among the factors affecting the quality and capability of laser cutting machine processing, the focal point position has the greatest influence, and its specific relationship with processing is as follows.

Relative to the surface of the material to be processed, after the laser beam is focused, the focal point position has an effect on almost all the processing parameters, such as the width and slope of the cutting slit, the roughness of the cutting surface, the slag adhesion state and the cutting speed.

This is because changes in the focal point position cause changes in the beam diameter on the surface of the processed material and in the angle of incidence of the beam into the processed material, thereby affecting the state of formation of the cutting slit and the state of multiple reflections of the beam in the slit. These cutting phenomena will affect the flow state of auxiliary gas and molten metal in the cutting slit.

The focal point state on the surface of the processed material is set to z=o "zero", and the focal point position is shifted upwards with "+" and downwards with "-", and the amount of shift is expressed in mm. The width of the upper kerf W at the focus position z=o is the minimum value. The upper notch width W becomes wider whether the focus position is moved up or down.

This change has the same tendency when dealing with lenses of different focal lengths. The smaller the beam diameter at the focus position, the smaller the focal depth of the lens, and the greater the change in the upper slit with the focus position.

Fiber laser cutting machine in the processing of metal, metal cutting quality will be affected by a variety of factors, as long as the adjustment according to the specific causes, these problems can be solved. When using the laser cutting machine, if you encounter a failure that can not be dealt with, you should first contact the laser cutting machine manufacturer and ask professional technicians to help deal with it, which can save a lot of time and energy. After a period of time, you can accumulate more experience in operating the laser cutting machine and produce higher quality metal workpieces.