Study On Bending Process Of 6063 Aluminum Alloy Micro Tube

Due to the advantages of flexible deployment and launch mode,high function density and low system cost,the application of microsatellite is in the stage of rapid development with continuous investment of commercial capital and enrichment of new technologies and breakthroughs in recent years.In order to realize the integration of electronic devices in a smaller space,the micro heat pipe used for heat exchange needs to be bent into different shapes to match.However,in different environments,the bending of micro heat pipe will produce many forms of defects,which affect the application of heat pipe.In this paper,6063 aluminum alloy micro tube and micro heat pipe are taken as the main objects.The bending process of two kinds of aluminum alloy tubes under different parameters is studied by using the method of process test and finite element numerical simulation,The bending of two kinds of aluminum alloy tubes under current assisted and dielectric assisted processes was studied,and the influence of current assisted and dielectric assisted processes on defect improvement was explored.Firstly,based on ABAQUS software,the numerical simulation of 6063 aluminum alloy micro tube and micro heat pipe was carried out.The bending forming of two kinds of aluminum alloy tubes without auxiliary process and the influence of the two auxiliary processes on the forming quality of the test tube are analyzed.The results show that the cross-section distortion,wall thickness change and other defects will occur when the aluminum alloy tube is bent,and the outer crack defects will occur when the bending radius is R6 and R10;When the current assisted bending is applied,the cross-section distortion rate decreases and the wall thickness change rate increases;When the medium assisted bending is used,the distortion rate of the test tube section decreases,the change rate of the outer wall thickness increases,and the change rate of the outer wall thickness decreases.Then,the experimental study of 6063 aluminum alloy micro tube without auxiliary process and current auxiliary process is carried out.The results show that the larger the bending radius is,the smaller the section distortion rate and wall thickness change rate are;The larger the outer diameter of the tube is,the larger the distortion rate of the cross section and the change rate of the wall thickness are;The larger the bending speed is,the smaller the section distortion rate and wall thickness change rate are;The larger the bending angle is,the larger the distortion rate and wall thickness change rate are.Finally,the 6063 aluminum alloy miniature heat pipe was tested without auxiliary process and with two kinds of auxiliary process.The results show that when the current density reaches the critical current density of 5A / mm 2 The results show that the distortion rate of the cross section of the heat pipe decreases and the wall thickness change rate increases obviously;In the case of medium assisted bending,the change rate of outer wall thickness increases with the increase of internal pressure,while the change rate of inner wall thickness decreases with the increase of internal pressure.When the internal pressure reaches 4MPa,the cross-section distortion rate decreases obviously.Combined with the results of numerical simulation and process test,it provides a reference for reasonable selection of tube forming process and parameters and control of forming quality of 6063 aluminum alloy micro heat pipe.