Machine tool complete machine static rigidity design method

Abstract

The invention discloses a machine tool complete machine static rigidity design method, which comprises the steps of by adopting a static condensation method and joint part rigidity assumption, establishing a component six-degree-of-freedom static rigidity model; establishing a six-degree-of-freedom contact rigidity model of the joint part according to the principle of equal deformation and load superposition of parallel springs; establishing a complete machine tail end relative static rigidity model; taking the relative static rigidity of the tail end of the complete machine as a constraint condition, calculating the contribution rate of the static rigidity of each component and the joint part in the complete machine structure to the rigidity of the tail end according to the established model, and determining the design range; and adopting a design process from the relative static rigidity of the tail end of the complete machine to the static rigidity of each component and the joint part to perform quick matching design on the static rigidity of each component and the joint part. According to the method, the tail end static component distribution of the whole machine tool in the global working space can be rapidly calculated in the stages of initial design, optimization analysis and structure modification, the component and joint part model meeting the tail end static rigidityconstraint is designed, the design efficiency and accuracy are improved, and the production and manufacturing cost is reduced.

Description

technical field [0001] The invention relates to the field of machine tools, in particular to a method for designing the static stiffness of a complete machine tool, which can effectively solve the problems of modeling and matching design of the static stiffness of the complete machine. Background technique [0002] Static stiffness is an important performance index to evaluate the bearing capacity of the end of the machine tool, which characterizes the ability to resist elastic deformation after the cutting force is applied. Establishing a static stiffness model that can reflect the explicit mapping relationship between the local stiffness of the components and joints and the end stiffness is the primary link to guide the static stiffness matching design. The traditional static stiffness modeling mostly uses commercial finite element software, which is accurate in calculation, but the efficiency is low, and it needs to be re-modeled for different positions of the workspace, ...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the traditional static stiffness modeling and the technical problem of completely relying on full finite element software in the design process, the present invention provides a semi-analytic modeling and matching design method for machine tool static stiffness, so as to obtain the static stiffness and matching design method of each component of the machine tool. Static stiffness of each joint of the machine tool

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