Analysis and finite element simulation of tube expansion in a rectangular cross-sectional die
Analysis and finite element simulation of tube expansion in a rectangular cross-sectional die
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DOI：
10.1243/095440503762502332
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发表时间：
2003-01
期刊：
影响因子：
--
通讯作者：
Y. Hwang;W. Chen
中科院分区：
文献类型：
--
作者：
Y. Hwang;W. Chen
本文的目的是提出一个简单的解析表达式，它可以很容易地用于制造厂估计的成形压力，并探讨在矩形截面模具液压扩张过程中的管材的塑性变形行为。首先，当考虑粘附条件时，使用薄壁和厚壁定理的解析表达式被提出来确定所需的成形压力，以液压成形为矩形截面的圆管与所需的拐角半径。然后对胀形过程进行了一系列的有限元模拟，并将模拟结果与解析表达式进行了比较。本文还研究了矩形口模内管材液压胀形过程中的流态。讨论了胀形过程中模具与管材之间的摩擦系数对胀形过程中某些位置的壁厚变化以及胀形后壁厚分布的影响。
Abstract The objectives of this paper are to propose a simple analytical expression, which can be used easily in a manufacturing plant to estimate the forming pressure, and to explore the plastic deformation behaviour of the tubes during the hydraulic expansion process in a rectangular cross-sectional die. At first, when considering the sticking condition, analytical expressions using the thin-walled and thick-walled theorems are proposed to determine the forming pressures needed to hydroform a circular tube into a rectangular cross-section with a desired corner radius. Then a series of finite element simulations of tube expansion are carried out to compare the simulation results of forming pressures with those from the proposed analytical expressions. The flow pattern of the tube during hydraulic expansion in a rectangular die is also examined. The effects of the friction coefficient between the die and the tube upon the thickness variations at certain positions during expansion and the thickness distributions after the expansion process are discussed.