航空用2024合金型材拉弯有限元分析研究  

Finite Element Analysis of 2024 Alloy Profiles for Aviation

作　　者：王东辉 孙巍 王向杰 徐亚军 陈长科 Wang Donghui;Sun Wei;Wang Xiangjie;Xu Yajun;Chen Changke(School of materials science and engineering,Northeastern University,Shenyang 110000,China)

机构地区：[1]东北大学材料科学与工程学院,辽宁沈阳110000

出　　处：《有色金属加工》2023年第6期13-17,共5页Nonferrous Metals Processing

摘　　要：采用数值模拟和试验相结合的方法,建立了一套2024合金挤压型材拉弯回弹预测方法。通过绘制拉弯机在运动过程中的轨迹,使用点坐标设置了拉弯夹头的位移曲线,并建立了拉弯工艺有限元模型。将数值模拟的结果与实际试验数值对比后发现,数值模拟的误差值在6%左右,验证了该方法的可靠性。通过此种数值模拟预判2024合金型材拉弯回弹量,可以很大程度的减少实际生产试验,节省了大量的人力及物力。同时,数值模拟结果也展示了2024合金型材在拉弯过程中整体应力分布的变化。通过观察得知,在整个拉弯过程中,仅在预拉伸阶段,型材的应力分布是均匀的;在包覆阶段乃至补拉伸阶段,型材的应力分布也因形变量的不同出现了差别,但是在整个包覆过程中,最大应力始终出现在型材与模具相切的位置;卸载后,型材中仍存在残余应力。In this paper,a set of prediction method of tensile bending springback of 2024 alloy extruded profile is established by combining numerical simulation and experiment.By drawing the trajectory of the stretch bending machine in the movement process,the displacement curve of the stretch bending chuck is set up with the point coordinates,and the finite element model of the stretch bending process is established.By comparing the numerical simulation results with the actual test values,it is found that the numerical simulation error value is about 6%,which verifies the reliability of this method.The numerical simulation can predict the stretching-bending rebound of 2024 alloy profiles,which can greatly reduce the actual production test and save a lot of manpower and material resources.At the same time,the numerical simulation results also show the change of the overall stress distribution of 2024 alloy profiles during the tensile bending process.The observation shows that the stress distribution of the profile is uniform only in the pre stretching stage during the whole process of tensile bending;In the coating stage and even the supplementary drawing stage,the stress distribution of the profile is also different due to different shape variables,but in the whole coating process,the maximum stress always appears at the position where the profile is tangent to the die.After unloading,residual stress still exists in the profiles.

关 键 词：2024合金 拉弯工艺 数值模拟 

分 类 号：TG379[金属学及工艺—金属压力加工]