Three-point support optimization design method of machine tool bed based on response surface model

Abstract

The invention discloses a three-point support optimization design method of a machine tool bed based on a response surface model. The method comprises the steps that a simplified model of a bed structure is established in CAD (Computer-Aided Design) software; three-point support limiting positions are found; a variable design space and an optimization objective are determined; test sample points for statics analysis are selected from the design space, and subjected to the statics analysis by finite element analysis software; a response value is calculated and extracted; a second-order response surface model, reflecting an input-output relation of structural design, of deformation at guide rails of the bed is established according to the response value; an optimal solution of the response surface model is acquired by a genetic algorithm; based on the established second-order response surface model, three-point support positions when the deformation of the guide rails is minimum are found; a practical model of the bed is subjected to the statics analysis; and the reliability of three-point support optimization design is verified. With the adoption of the method, the deformation of a machine tool is reduced; the machining precision of the machine tool is improved; the three-point support optimization efficiency and the optimization precision are improved; and the problems that the calculation amount is large, the efficiency is low, and an optimal result cannot be ensured easily in the existing optimization technique are solved.

Description

technical field [0001] The invention relates to an optimal design method for large machine tool parts, in particular to a three-point support optimal design method for a machine tool bed based on a response surface model. Background technique [0002] Machine tool leveling has an important impact on the stability and accuracy of machine tool processing. The traditional connection method between the anchor bolts around the machine bed and the ground has many contact points, which is not conducive to machine tool leveling. The three-point support uses the principle of three points to determine one side, which facilitates the leveling of the machine tool, not only improves the stability and precision of the machine tool, but also saves installation costs and shortens the installation cycle. [0003] At present, the optimization of the three-point support on the bed is still limited to the comparison method. Its essence is that the designer repeatedly modifies the position of t...

AI Technical Summary

Problems solved by technology

This method is difficult to ensure that the selected parameter combination is optimal, and it takes a lot of time to select the parameter combination and perform numerical simulation analysis and calculation, which cannot meet the design and production requirements of modern machine tools.

Therefore, a three-point support optimization design method for the machine tool bed based on the response surface model is proposed to solve the problems of low optimization efficiency and optimization accuracy.

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