A Real-time Compensation Method for Comprehensive Error of CNC Machine Tool

Abstract

The invention discloses a real-time compensation method for comprehensive errors of a numerical control machine tool. The method comprises the steps that S1, geometrical errors are measured and then identified; S2, a machine tool guide rail thermal error model is established; S3, a Z-direction deviation error model of a machine tool workbench is established; S4, temperature data of positions of the machine tool are collected, and positions of to-be-machined parts are determined; S5, the temperatures of the positions are substituted into the machine tool guide rail thermal error model, and real-time geometrical errors of the machine tool caused by thermal deformation are obtained; S6, the geometrical errors and the real-time geometrical errors obtained in the step S5 are linearly superposed, a G code is changed, and compensation is achieved; S7, the temperatures of the positions and the position information of the to-be-machined parts are substituted into the Z-direction deviation errormodel of the workbench, and real-time Z-direction deviation of the workbench is obtained; and S8, real-time compensation for Z-direction thermal errors of the workbench is achieved by combination with the coordinate origin deviation function. According to the real-time compensation method for the comprehensive errors of the numerical control machine tool, modeling is convenient and economical, the labor needed for experiments can be greatly saved, the shutdown time of the machine tool can be greatly shortened, comprehensive machine tool error information can be provided, and real-time compensation for the comprehensive errors of the numerical control machine tool is achieved.

Description

technical field [0001] The invention relates to a machine tool error compensation method, in particular to a real-time compensation method for comprehensive error of a numerical control machine tool. Background technique [0002] With the continuous advancement of "Made in China 2025", the application demand for high-precision machining technology in aerospace, medical equipment and other precision equipment manufacturing fields is increasing, and the requirements for machining accuracy of high-end CNC machine tools represented by five-axis linkage are also increasing . However, the use error of machine tools seriously restricts the improvement of the use level of CNC machine tools in my country. A large number of studies on the error sources of CNC machine tools have shown that geometric errors and thermal deformation errors account for about 50% to 70% of the overall error of the machine tool. Therefore, in order to improve the machining accuracy of the machine tool, it ...

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Problems solved by technology

For thermal deformation errors, effective error compensation is expensive due to modeling difficulties

Usually the modeling of thermal error is based on a large number of experiments, which not only requires a lot of machine tool processing time and high cost, but also due to the limitation of experimental conditions, it is often difficult to obtain perfect and comprehensive thermal error information

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