Causes of errors in metal laser cutting machine
There are many problems in the use of metal laser cutting machines, including errors in the laser cutting process, poor laser cutting results, etc., so how do these errors occur?
1. Geometric error of workpiece
Due to various reasons, the surface of the processed object is undulating, and heat will be generated during the cutting process, and the surface of the thin plate part is easily deformed, and due to the uneven surface, the position and ideal position of the laser focus and the surface of the processed object will also be generated. Random changes occur.
2. The cutting thickness of the material exceeds the standard
The cutting material thickness exceeds the standard. Take 3000W as an example: The thickness of the plate that the laser cutting machine can cut is less than 20 thicknesses. The thinner the plate, the easier it is to cut and the better the quality. If the plate is too thick, the laser cutting machine will be more difficult to cut. Under the condition of ensuring the cutting, there will be errors in the processing accuracy, so the thickness of the plate must be determined.
3. Errors caused by programming
During the processing of the fiber laser cutting machine, the processing trajectory on the complex curved surface is fitted by straight lines, arcs, etc. There are errors between these fitting curves and the actual curves. These errors make the relative position of the actual focus and the surface of the processed object and The ideal programming position produces errors. And some teaching programming systems will also introduce some deviations.
4. The occurrence of focus position error during laser cutting
In the cutting process of the fiber laser cutting machine, there are many factors that cause the relative position between the focus and the surface of the processed object to change, which are also related to the surface smoothness of the processed product, the workpiece clamping method, the geometric error of the machine tool, and the long time of the machine tool. Load deformation, thermal deformation of the workpiece during processing, etc. will cause the laser focus position to deviate from the ideal given position (programmed position).
These random errors are unavoidable, and only through online detection and control to reduce the generation of errors, so as to improve the accuracy of the fiber laser cutting machine.
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