A Method for Improving the Modeling Accuracy of Precision Machine Tool Spatial Geometric Error Model

Abstract

The invention belongs to the technical field of precision machining and testing and aims to solve the problem that a certain theoretical calculation error exists in establishment of a parameter-variable-containing representation space geometric error model of a precision machine tool. Mathematical theoretical basis and data processing are considered. In combination with related factors causing reduction of precision machine tool modeling precision and increase of theoretical calculation errors, a method for improving precision machine tool space geometric error model modeling precision is provided for iterative solution of an inter-body static and motion ideal feature matrix and an inter-body static and motion error feature matrix. Theoretical calculation errors caused by neglecting high-order infinitesimal iterative solution precision on the basis of a small error hypothesis theory are eliminated. On the basis that the modeling precision is guaranteed to be in a certain numerical magnitude, the purpose of practical effect is achieved. The method can be expanded and applied to the precision modeling technology of the ultra-precision machine tool, the precision of the ultra-precision machine tool is improved from the aspect of theoretical modeling precision, and therefore the method has good market application prospects and popularization value.

Description

technical field [0001] The invention belongs to the technical field of precision machining and testing, and relates to a method for improving the modeling precision of a precision machine tool space geometric error model. Background technique [0002] Precision and ultra-precision machining technology is a manufacturing technology aimed at high precision. It has not only become a technology that countries focus on developing, but also becomes a symbol to measure a country's manufacturing level. Among them, precision and ultra-precision machine tool precision modeling technology is one of the effective ways to improve precision and ultra-precision machining technology. This technology is based on multi-body system theory and homogeneous coordinate transformation method, based on small error hypothesis theory and ignores high-order infinitesimals. At the same time, with the help of different measuring instruments and their corresponding measuring methods, related methods of pr...

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Problems solved by technology

However, the current solution method can only achieve the solution accuracy of the same magnitude of numerical deviation, and when the number of linkage axes of the CNC machine tool increases, the magnitude of the numerical deviation will further increase, even greater than the measured value of the instrument, the working The numerical magnitude of the actual demand value and process improvement value, that is, the modeling accuracy will be further reduced, so the resulting modeling accuracy error will cause a large undetermined theoretical calculation error, and will affect the processing of precision machine tools. Accuracy and performance have some impact

[0004] Based on the above analysis, the theoretical modeling accuracy is particularly important in precision machine tool precision modeling technology. If there is a certain theoretical calculation error, the modeling accuracy and error analysis of CNC machine tools will produce greater uncertainty. It will cause a certain hindrance; especially for precision machine tools with multi-axis linkage, its modeling accuracy is even more prominent

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