Prediction And Suppression Of Micro-milling Mesoscopic Thin-walled Deformation

Microminiature products are increasingly used in aerospace,medical equipment,communication equipment and other fields,some of which have thin-walled features of meso-scale.The high-precision processing of meso-scopic thin-walled parts has become a barrier.Micro-milling technology is an effective method for processing meso-scale thin-walled parts,which has the advantages of high efficiency,high precision and low cost.However,thin-walled parts have the characteristics of weak rigidity and poor processability,and are easily deformed during micro-milling,which directly affects the precision of thin-walled parts.Therefore,the prediction and suppression of micro-milling thin-walled parts deformation are the premise and key to achieve high-precision machining of thin-walled parts.In this paper,the deformation prediction and suppression in the process of micro-milling of meso-scale thin-walled parts are studied in depth.First,based on the ABAQUS finite element simulation software,a simulation model of the thin-walled micro-milling process is established.The Johnson-Cook material model and damage model are used to describe the material properties and damage criteria of Inconel718,a difficult-to-machine material.The accuracy of the model is verified through experiments.Secondly,based on the birth-death element method,a deformation prediction model of micro-milling thin-walled parts is established to realize the prediction of the machining deformation.The experiment verifies the reliability of the prediction results,and this paper analyzes the thin-wall micro-milling machining deformation rules through experiments.Finally,based on the regression analysis method,a tool wear prediction model is established,and a tool path compensation scheme considering tool wear is proposed.According to the factors that affect the deformation of thin-walled machining,the causes of deformation of thin-wall micro-milling are analyzed,the corresponding improvement measures are proposed,and high-precision machining of thin-wall is finally realized.The research results of this paper can lay a foundation for the deformation suppression of thin-walled parts micro-milling,and can provide a reference for achieving high-precision machining of thin-walled parts.