Methods of improving CNC machining accuracy


Methods of improving CNC machining accuracy

In the machining process of mechanical parts, the quality precision control firstly improves the geometric precision of the machine tool, the precision of measuring tools and tools, controls the error caused by the force and thermal deformation of the process system, reduces the deformation error caused by the cutting tool wear and internal stress, and reduces the measurement error as far as possible, all of which belong to the direct reduction of the original error. Improve the machining accuracy of mechanical parts, analyze the original errors of machining errors, and take corresponding measures to solve the main original errors according to different situations. For the processing of precision mechanical parts, the geometric accuracy, stiffness and thermal deformation of precision machine tools should be improved as much as possible; For the parts with forming surface, the main problem is how to reduce the shape error and installation error of forming tool.

The method of error compensation can be used to control the influence of some original errors in the processing of mechanical parts. Sometimes a new kind of original error will be created by human, so as to compensate or offset the original error inherent in the original process system, so as to reduce the machining error and improve the machining accuracy. Using one original error to partially or completely offset the original error or another original error. In order to improve the machining accuracy of a batch of mechanical parts, the method of dividing some original errors can be adopted. For the part surface with high machining accuracy, the method of homogenizing the original error step by step can be adopted in the process of continuous trial cutting.

After the basic understanding of the machining process, according to the error reflection law, the workpiece size of the blank or process is divided into n groups according to the size, and the size range of each group of workpiece is reduced to the original 1n. Then, according to the error range of each group, the accurate position of the cutter relative to the workpiece is adjusted respectively, so that the center of the size dispersion range of each group of workpieces is basically the same, so that the size dispersion range of batch workpieces is greatly reduced.

The process of reducing and equalizing the original error of machined surface by machining. The principle of homogenization is to find out the differences between the closely related workpieces or tool surfaces through mutual comparison and inspection, and then carry out mutual correction machining or benchmark machining.

In the machining process, the original error is transferred from the error sensitive direction to the error insensitive direction, and the original error is transferred to the error insensitive direction. The degree of various original errors reflected in the machining errors of parts is directly related to whether they are in the error sensitive direction. If we try to transfer it to the non sensitive direction of machining error, the machining accuracy can be greatly improved. Transfer the original error to other aspects that have no effect on the machining accuracy.

The above is to share how to improve the machining accuracy of mechanical parts, thank you for your attention!


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