Optimized design method of overall static rigidity of machine

Abstract

The invention discloses an optimized design method of overall static rigidity of a machine. The method includes the steps of establishing a simple machine model by Pro / E software; importing the simple machine model into SAMCEF software to establish a machine finite element model; parameterizing rigidity features of large structures of the machine to determine design parameters and a design space; selecting test sample points for finite element analysis by a central composite experiment design method; subjecting the test sample points to finite element analysis to obtain machine static rigidity response values of the test sample points; establishing a response surface model for large structure rigidity feature parameters and machine static rigidity; analyzing sensitivities of large structure rigidities to the machine static rigidity so as to determine a static rigidity weak link, and performing optimized design. The optimized design method of overall static rigidity of the machine has the advantages that the sensitivities of the structures of the machine to the machine static rigidity are effectively determined, the weak link restricting the improvement of the machine static rigidity is effectively found, and accordingly important basis for the optimized design of machine structure is provided to guide designers to optimally design the weak large structures of the machine.

Description

technical field [0001] The invention relates to an optimal design method for the static stiffness of a machine tool, in particular to a method for determining the weak link of the whole machine and optimizing the design for improving the static stiffness of the machine tool. Background technique [0002] The whole machine tool is a system composed of large parts such as the spindle box, column, bed and worktable in series. The static stiffness characteristics of the big parts will have an impact on the static stiffness of the whole machine. At present, when the static stiffness of the machine tool is insufficient, the search and optimization of the weak and large parts of the machine tool are limited to the finite element analysis of the whole machine, and the deformation of the machine tool is analyzed from the perspective of the machine tool as a whole. It is difficult to measure the structural rigidity of the major parts. The contribution rate of the static stiffness of t...

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Problems solved by technology

At present, when the static stiffness of the machine tool is insufficient, the search and optimization of the weak and large parts of the machine tool are limited to the finite element analysis of the whole machine, and the deformation of the machine tool is analyzed from the perspective of the machine tool as a whole. It is difficult to measure the structural rigidity of the major parts. The contribution rate of the static stiffness of the whole machine makes it difficult for the machine tool designers to find the weak link of the whole machine structure and improve the corresponding structure so as to optimize the design of the large machine tool structure in a targeted manner, thus consuming a lot of time and energy for the designers

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