Interval theory-based geometric precision optimization allocation method for precision horizontal machining center

Abstract

The invention discloses an interval theory-based geometric precision optimization allocation method for a precision horizontal machining center. The method comprises the following steps of (1) based on a multi-body system kinematics theory, building a mapping model between geometric errors and space errors of a machine tool; (2) based on an interval theory, performing sensitivity analysis on error sources; (3) based on the interval theory, building an interval optimization allocation model; and (4) based on a genetic algorithm, performing solving by applying MATLAB software to realize geometric precision optimization allocation. According to the method, the error sources difficult to realize are relaxed to a maximum feasible interval, so that the production cost is greatly reduced and the production and assembly efficiency of the machine tool is improved.

Description

technical field [0001] The invention relates to the field of optimal distribution of geometric precision of numerical control machine tools, in particular to a method for optimal distribution of geometric precision of precision horizontal machining centers based on interval theory. Background technique [0002] Precision CNC machine tools are the main machine tools of basic manufacturing equipment, and their design and processing capabilities directly affect the development of the manufacturing industry. The quality of high-end CNC machine tools is directly reflected in the manufacturing precision and assembly precision of the machine tool, while the quality of machine tool precision design and precision distribution has a major impact on its quality. [0003] Scholars at home and abroad have carried out extensive and in-depth research on the distribution of machine tool precision, and have made some progress. There are mainly methods such as component tolerance weighted Eu...

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Problems solved by technology

There are mainly methods such as component tolerance weighted Euclidean norm maximum method, Monte Carlo method, dimensional chain method, and precision allocation method based on tolerance-cost model. Most of these methods are aimed at parallel mechanisms and cannot directly guide the manufacturing and assembly of high-end CNC machine tools. process

At present, domestic machine tool companies usually use traditional analogy, machine tool manual query and designer's estimation methods when designing and assigning precision CNC machine tools. Without fundamentally solving the problem, the designed machine tool will inevitably rely too much on the designer. experience, it is impossible to form a scientific, theoretical and systematic design method

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