Method for predicting and analyzing cutting deformation of thin-walled structural parts

Abstract

The invention discloses a method for predicting and analyzing cutting deformation of thin-walled structural parts. Based on combination of finite element simulation analysis and cutting force thermalcoupling theoretical modeling, the evolution process of blank structural parts with initial residual stress in an internal stress field during the coarse and fine cutting process to better reflect theimpact of body residual stress distribution of the structural parts after coarse processing on cutting residual stress distribution of a finish machining surface layer, and the impact of stress release of the structural parts after completion of the whole cutting process on processing deformation, and finally the prediction of machining residual stress and machining deformation can be achieved.

Description

technical field [0001] The invention relates to the technical field of machining, in particular to a method for predicting and analyzing cutting deformation of thin-walled structural parts. Background technique [0002] Thin-walled structural parts have been widely used in many advanced manufacturing fields such as aerospace, energy, automobiles, and electronics, which can significantly improve equipment performance. For example, a large number of integral structural parts directly processed from large blanks are used on aircraft, which can significantly improve the strength of the fuselage and the accuracy of aerodynamic shape, reduce the weight of the fuselage, reduce parts and corresponding assembly workload, and improve the maneuverability and reliability of the aircraft. sex. However, the structural rigidity of thin-walled parts is poor, the material removal rate is high during processing, and the internal stress of the workpiece changes drastically during the processi...

AI Technical Summary

Problems solved by technology

However, the simulation calculation of cutting physics requires a lot of computing resources, and the calculation efficiency is low. It is unrealistic to perform cutting physics simulation of the complete part machining process.

In the existing research, scholars are committed to using certain technical means to simplify and equivalent the machining process of parts. For example, the more commonly used "unit life and death" technology can well simulate the process of material removal and blank initial stress release during machining, but This simplified method is difficult to reflect the cutting residual stress introduced by the cutting force and thermal load on the surface layer of the workpiece and its influence on the machining deformation of thin-walled structural parts

Under the current technical conditions, compared with physical simulation analysis technology, theoretical analysis calculation can achieve higher accuracy, but it is difficult to analyze the overall stress field and deformation of complex three-dimensional parts based on analytical methods

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