In the process of laser cutting in Jining, there are many factors that produce the change between the focus and the relative position between the surfaces of the processed objects. These factors may cause the deviation of the laser focus position and the ideal location. Some of these errors are very regular and can be compensated by the method of quantitative compensation, but some errors are random errors, which can only be solved by on-line detection and control.
Cause analysis of focal position error in laser cutting process
The random errors that can only be eliminated by online detection and control are:
Geometric error of the workpiece. The object of laser cutting is plate or cover parts. Because of the influence of various reasons, the surface of the machining object is undulating, and the surface deformation of the sheet parts will be produced by the influence of heat effect during the cutting process. For the 1 dimension laser cutting, the surface of the panel will also be produced during the pressing forming process. All these will cause random changes in the location of laser focus and the location of the object.
The error produced by the clamping device of the workpiece. The laser cutting workpiece is placed on a needle like worktable. Due to the machining error, the long time with the wear between the workpiece and the laser burn, the needle bed will appear convex and concave, which will also produce random errors between the position of the thin plate and the laser focus.
The error produced by programming. In the process of laser cutting, the machining trajectory on a complex surface is fitted by a straight line and a circular arc. There is a certain error between these fitting curves and the actual curves. These errors make the relative position of the actual focus and the surface of the object surface and the ideal programming position error, and some teaching programming systems also have a certain error. Some deviations will be introduced. (specifically, we can see the introduction of the technology application and abnormal problems of laser cutting).
The uneven surface of the machined workpiece, the clamping way of the workpiece, the geometric error of the machine tool, the deformation of the machine tool under the load force and the thermal deformation of the workpiece in the process of machining will cause the deviation of the position of the laser focus and the ideal position (the programming position). The processing personnel and the designers should add more attention to the work process. Meaning.
The factors that affect the precision of laser cutting are:
First, the material of the workpiece has certain effect on the accuracy of laser cutting. In the same case, stainless steel has higher cutting accuracy than aluminum and smooth section.
Two, the larger the workpiece thickness, the lower the accuracy, the larger the slit. Because the laser beam is conical, the slit is also tapered, and the stainless steel with thickness of 0 and 3MM is much smaller than that of 2MM.
Three. The size of the light spot after the laser beam is focused. The smaller the spot of the laser beam is, the higher the cutting precision, especially the smaller slit, and the smallest spot can reach 0, 01mm.
Four. The accuracy of the workbench determines the accuracy of the cutting. The higher the accuracy of the worktable, the higher the accuracy of cutting.
标签:   钣金加工 激光切割加工