Thermal error precision conversion and model establishing method of machine tool

Abstract

The invention discloses a thermal error precision conversion and model building method of a machine tool. The method comprises the following steps: 1) establishing and simplifying a machine tool CAD (Computer Aided Design) model; 2) carrying out CAE (Computer Aided Engineering) thermoanalysis on the simplified machine tool CAD model; 3) extracting the thermal deformation value of each motion axis unit through a CAE thermoanalysis postprocessing module, and converting the thermal deformation value into a basic geometrical error of a unit; and 4) on the basis of the basic geometrical error of the unit, establishing a thermal error model of a machine tool work space. Designers who adopt the method can foresee the thermal deformation of the machine tool and predict the tail end errors, the tail end precision and the like of the machine tool in a machine tool design stage, so that design reliability is increased. The method can save a great quantity of time and money on the basis of CAE software, and can provide comprehensive thermal error information.

Description

technical field [0001] The invention relates to a machine tool thermal error modeling method, in particular to a machine tool thermal error precision conversion and model establishment method. Background technique [0002] In recent years, with the rapid development of my country's manufacturing industry, the requirements for the processing performance and comprehensive precision level of high-end CNC machine tools are also getting higher and higher. Studies have shown that in the processing of precision and ultra-precision CNC machine tools, the machine tool errors caused by thermal effects generally account for about 40%-70% of the comprehensive errors. Therefore, how to obtain the thermal error of the machine tool and establish a thermal error model to obtain the end accuracy data of the machine tool is one of the key issues to improve the accuracy of the machine tool. At present, the methods commonly used to establish thermal error models are: multiple linear regression...

AI Technical Summary

Problems solved by technology

However, the experimental method usually takes a lot of time and money, and due to the limitation of experimental conditions, it is often difficult to obtain comprehensive thermal error information; at the same time, it also makes the design lag, and the accuracy of the end of the machine tool cannot be controlled at the design stage

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