2. Shape of laser beam

The laser beam of metal laser cutting machine is conical, so the slit cut is also conical. The shape of laser beam is also a major factor affecting the cutting accuracy of metal laser cutting machine. The smaller the spot after the laser beam is concentrated, the smaller the kerf, and the higher the machining accuracy.

In this tapered laser beam condition, the greater the thickness of the workpiece, the lower the accuracy, and therefore the larger the kerf. Therefore, when processing metals with different thicknesses, it is necessary to select the appropriate laser power to obtain better results.

 

3. Accuracy of worktable

When the laser metal cutting machine is processing, the worktable vibrates with the vibration of the laser head. The higher the precision of cutting, the higher the precision of cutting is when the high-precision workbench is matched with stable linear guide rail and stepping motor; If the worktable is uneven or for other reasons, the processing accuracy of the fiber laser cutting machine will also be affected.

 

4. Auxiliary gas and nozzle

In the process of laser metal cutting machine, the auxiliary gas and nozzle play a role in cleaning and controlling the cutting speed. The uneven pressure and temperature in the air flow will cause the change of the air flow field density, which will dry up the focusing of the beam energy, cause refocusing or beam divergence, and affect the metal cutting accuracy.

 

 

Among the factors that affect the processing quality and capability of the laser cutting machine, the focus position has the greatest impact, and its specific relationship with the processing is as follows. 

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

This is because the change of the focus position will cause the change of the beam diameter on the surface of the processing material and the angle of incidence of the beam into the processing material, which will affect the formation state of the kerf and the multiple reflection state of the beam in the kerf. These cutting phenomena will affect the flow state of auxiliary gas and molten metal in the cutting seam. 

Set the state of the focus on the surface of the processing material to z=o "zero", use "+" when the focus position moves upward, use "-" when it moves downward, and use mm to express the amount of movement. The upper kerf width W at the focus position z=o is the minimum. Whether the focus position moves up or down, the upper slit width W will become wider. 

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

 

When fiber laser cutting machine processes metal, the quality of metal cutting will be affected by various factors, and these problems can be solved as long as adjustments are made according to specific reasons. If you encounter failures that cannot be handled when using a laser cutting machine, you should first contact the laser cutting machine manufacturer and ask for help from professional technicians, which will save you a lot of time and effort. After a period of operation, you can accumulate more experience in operating laser cutting machines to produce higher-quality metal workpieces.