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Accuracy tolerance of laser cutting machine processing

The processing effect of the laser cutting machine is actually very good, so you can rest assured to use the laser cutting machine for processing work, but after the laser cutting machine is used for a period of time, many factors will cause the processing accuracy of the laser cutting machine to decrease to a certain extent. , Then do you know about the machining accuracy tolerance of the laser cutting machine?



The processing accuracy of laser cutting machines is currently the main standard parameter used to measure the quality of machine tools in the industry. During equipment sales, sales personnel will have a specific description of the processing performance of the product. Among them, the processing accuracy of laser cutting machine tools is mostly 0.5mm. Of course, there are a few manufacturers that provide higher-precision laser cutting machine with a processing accuracy of 0.3mm. However, in general, there is still a certain accuracy tolerance in the cutting accuracy, which is what we call the processing scale tolerance.


The processing of the laser cutting machine is based on the design of the company's cutting drawings, and the general part cutting drawings have clearly marked tolerance areas and values. Considering that the position of the tolerance zone of the cutting parts cannot be consistent, it may be possible to eliminate the above tolerance zone through a variety of technological means.


In the programming process of laser cutting machine, if the methods and techniques are used properly, it is of great significance to ensure and improve the processing accuracy of CNC machine tools. Many dimensions of parts are marked with tolerances, and the position of the tolerance zone can not be consistent, and the CNC program is generally compiled according to the contour of the part, that is, according to the basic size of the part, ignoring the influence of the position of the tolerance zone. In this way, even if the precision of the CNC machine tool is very high, the processed parts may not meet its dimensional tolerance requirements.


In terms of processing methods, you can first consider using radius compensation to compensate for the impact of cutting tolerances. This type of method is relatively simple for actual cutting operations. The specific idea is to still program and execute on the laser cutting machine control system according to the basic dimensions, that is, the calculation and programming are still based on the basic size of the part, and the same turning tool is used to machine various external circles, and different tool radius compensation values are used when machining dimensions with different tolerance zones. With this method, you must first know the radius of the tool tip arc (the machining track of this part is parallel to the X axis and Z axis, you don't need to know the radius of the tool tip arc), so it is inconvenient to use and can only be applied to some CNC systems.


The above processing methods may be relatively complicated in the later cutting operation. If the size of the cut piece can be appropriately modified according to the drawing requirements in the early stage of cutting, it is also feasible to eliminate the influence of the tolerance area. The specific idea is to change the basic size and the position of the tolerance zone. The implementation aspect is to adjust the basic size and the position of the tolerance zone on the premise that the limit size of the part remains unchanged.


Generally adjust according to the symmetrical tolerance zone, the adjusted basic size and tolerance. The programming is carried out according to the adjusted basic size, so that the same turning tool and the same tool compensation value (the processing path in this example is parallel to the X axis and Z axis, and the tool compensation is not required) can ensure the machining accuracy. Of course, if the part needs to be finished (such as fine grinding) in the end, in order to ensure sufficient grinding allowance, the basic size can also be slightly increased (at this time, the tolerance zone is asymmetric).