铝合金板材曲面渐进折弯成形技术及实验研究

发布时间：2018-06-10 03:11

本文选题：铝合金板材 + 渐进折弯　；参考：《上海应用技术大学》2017年硕士论文

【摘要】：近年来,随着各行业的快速发展,节能减排和高速化成为追求的目标,轻量化已成为重要的课题。本文探讨作为轻金属的铝合金板材曲面渐进折弯成形技术,相对于水火弯板,激光弯曲成形等,将提高加工效率及成形精度,在飞行、船舶、建筑等工程中有大量的应用前景。本文以Al-Mg-Si系合金6061和Al-Li系合金8090为研究对象,对材料进行成形极限试验,获得成形极限图,为曲面成形过程做出有效指导。将材料库中的力学材料数据导入到有限元分析软件中,选用软件中原有的合理的本构模型和单元类型,构建铝合金板材曲面折弯成形的三维弹塑性数值仿真模型。并对马鞍形曲面渐进折弯成形过程中,板材应力应变及回弹的分布和变化规律进行模拟分析研究,对模拟中出现的缺陷现象,进行了理论分析探讨,通过改变相关参数以减少缺陷的产生,对实验研究具有重要的指导意义。本文通过数值模拟两种不同铝合金材料及其它关键因素,如折弯方式、板材进给量、凹模下压量、凸模开口、凸凹模曲率半径等对成形及回弹的影响,与高强钢作对比分析,并优化模具参数和工艺参数,通过实验研究,验证模拟的准确性,并获得精度较高的马鞍形曲面板材成形工件。通过数值模拟铝合金马鞍形曲面渐进折弯过程,得出了渐进折弯成形规律,为后续研究折弯成形复杂曲面打下基础。
[Abstract]:In recent years, with the rapid development of various industries, energy saving and emission reduction and high speed have become the goal of the pursuit, lightweight has become an important subject. This paper discusses the progressive bending forming technology of aluminum alloy sheet as light metal, relative to the water and fire bending plate, laser bending forming, and so on, will improve the processing efficiency and forming precision, in flight, ship, construction. In the construction and other projects, there are a lot of application prospects. This paper takes the Al-Mg-Si Alloy 6061 and Al-Li alloy 8090 as the research object. The forming limit test of the material is carried out, the forming limit diagram is obtained, and the effective guidance for the forming process of the surface is made. The data of mechanical materials in the material library are introduced into the finite element analysis software and the original software is selected. A three-dimensional elastoplastic numerical simulation model of curved forming of aluminum alloy sheet is constructed by the rational constitutive model and unit type. The distribution and change law of stress and strain and springback of the plate are simulated and studied in the process of progressive bending of saddle shaped curved surface, and the defects in the simulation are analyzed and discussed. In this paper, the effects of two different aluminum alloy materials and other key factors, such as bending method, feed rate, bottom die pressure, punch opening, concave die curvature radius, etc. on the forming and springback are simulated by numerical simulation. Comparing with the analysis, the parameters and parameters of the die are optimized and the accuracy of the simulation is verified by the experiment. The precision of the workpiece is obtained. The progressive bending process of the saddle shaped curved surface of the aluminum alloy is simulated by numerical simulation.
【学位授予单位】：上海应用技术大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG306

【相似文献】