Numerical control machine tool space error modeling method based on space grid compensation mode

Abstract

The invention discloses a numerical control machine tool space error modeling method based on a space grid compensation mode. The numerical control machine tool space error modeling method mainly comprises the following steps that step one, a three-axis numerical control machine tool space error universal model is established by utilizing a homogenous coordinate transformation method based on the multi-body system theory according to the type of a machine tool; step two, 21 geometric error elements in the model are measured by using a laser interferometer and modeling is performed; and step three, numerical control machine tool space error is compensated. According to the modeling method, static geometric error and dynamic thermal error modeling methods are integrated, a comprehensive model expression combination is separated into independent position influence terms and temperature influence terms, a space grid compensation list mode is adopted for the position error influence terms, and a real-time acquisition mode is adopted for the temperature error influence terms so that comprehensive compensation is realized. Therefore, the modeling method is scientific and effective and has the characteristics of being easy to compensate and convenient to apply.

Description

technical field [0001] The invention relates to the technical field of machine tool processing, in particular to a machine tool space error modeling method based on a space grid compensation method that can comprehensively and effectively compensate the errors of a numerically controlled machine tool. Background technique [0002] Modern machinery manufacturing technology is developing towards high efficiency, high quality, high precision, high integration and high intelligence. Precision and ultra-precision machining technology has become the most important component and development direction of modern machinery manufacturing, and has become a key technology for improving international competitiveness. [0003] Since thermal errors and geometric errors account for more than 70% of the various error sources of the machine tool, reducing these two errors is of great significance for improving the overall accuracy of the machine tool. [0004] At present, the methods to impro...

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Problems solved by technology

In addition, the vast majority of compensation separates geometric errors and thermal errors. Due to the complexity of machine tool errors, such as positioning errors, they are essentially both geometric errors (related to the coordinate position of the machine tool) and thermal errors (related to the temperature of the machine tool). Generally, these errors are compensated as geometric errors, but in fact, these errors change at different temperatures, so for this compound error that is both geometric error and thermal error (strictly speaking, the errors on the machine tool are related to temperature) ) To carry out comprehensive modeling and dynamic compensation of geometric errors and thermal errors, there is currently no effective comprehensive modeling and dynamic compensation methods for geometric errors and thermal errors

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