摘要
结构轻量化可以减少能源消耗,使日益严峻的能源危机得以缓解,因此,近年来汽车结构轻量化设计越来越被人们关注。在轻量化结构设计中,挤压型材的使用越来越广泛。不同于普通民用建材,由于汽车结构设计必须考虑到结构、空气动力学和美观等方面的因素,挤压型材一般在弯曲状态下使用。在型材弯曲,特别是薄壁空心型材的弯曲过程中会出现截面变形、回弹等各种缺陷,已成为其大规模应用的障碍。文章叙述了型材弯曲过程中容易出现的各种缺陷以及减小和避免这些缺陷所造成影响的适当方法;介绍了几种传统的弯曲工艺,如常用的绕弯、拉弯、滚弯及其他一些不常用的如压弯、激光弯曲和柔性垫弯曲,并详细分析了各种工艺的优缺点;还介绍了一种新型的挤压弯曲一体化成形工艺。
Lightweight construction conduces to the relief of the more and more serious energy crisis. Considering the factors of structure, aerodynamics and beautility, curved extrusions are usually used in lightweight design, while straight extrusions are used in the most circumstances like civil engineering. During the bending process of extrusions, especially for hollow extrusions, defects such as cross section deflection and springbaek may occur. In the present paper, bending defects and their preventive measures were firstly discussed. Then different kinds of bending methods and their characteristics were presented and analyzed. Finally, some new processes were introduced. In these new processes extrusion and bending were conducted in one working procedure.
出处
《塑性工程学报》
EI
CAS
CSCD
北大核心
2008年第3期61-70,共10页
Journal of Plasticity Engineering
基金
教育部新世纪优秀人才资助计划项目(20062148183)
关键词
型材
弯曲
回弹
模拟
extrusion
bending
springback
simulation
