摘要数控弯管由于具有能够精确、高效、低耗地制造轻量化、强韧化弯管零件等优势而得以在航空、航天以及汽车领域获得广泛应用。大弯曲半径弯管件因其具有弯管半径大，管坯弯曲角度小，弯曲成形后管坯变形程度小，质量和精度易得到保证等优点，近年来被广泛的应用于家具装饰，汽车输油管路以及石油运输管道中。但弯管件在弯管过程中因具有几何非线性、接触非线性、而导致它在弯管成形后不可避免的具有一些质量问题。对大弯曲半径的弯管件而言也同样具有一些质量缺陷，其中弯管成形后，模具卸载时弯管件的回弹就是影响大弯曲半径弯管件几何精度和形状精度的一个主要因素。因此对大弯曲半径弯管件在弯曲成形后的回弹研究具有十分重要的意义。49546

本文主要针对大弯曲半径管材在推弯成形后产生回弹的回弹角进行有限元模拟，对实际推弯模具简化的基础上建立有限元模型。通过ABAQUS/Explicit软件对大弯曲半径管材的回弹角进行模拟研究，主要研究内容如下：

1、通过对相对弯曲半径R/D、相对壁厚D/t的有限元模拟，测出他们推弯成形后的回弹角，比较分析了各参数对回弹角的影响趋势。

2、分别对铝合金管和不锈钢管的材料的硬化指数n和强度系数K的有限元模拟，分析比较了材料参数对大弯曲半径管材回弹角的影响

3、本文还对弯管回弹角国内外的研究现状进行阐述。

4、介绍了ABAQUS软件的主要功能

5、对实际推弯模具和装配进行二维图纸的绘制

毕业论文关键词：大弯曲半径；推弯；ABAQUS；回弹角；有限元

Abstract Numerical control tube bending because of it has accurate, high efficiency and low energy consumption to create lightweight and flexible tube bending parts of advantages and be able to in the aviation, aerospace and automotive field being widely applied. Big bend pipe bending radius because of its tube bending radius is big, of steel tube bending Angle is small, the bending deformation degree of steel tube after forming small, quality and accuracy easy guaranteed etc, and in recent years is widely used in furniture decoration, car pipeline and oil pipeline in the road. But bend pipe fittings in elbow pipe of process has geometrical nonlinearity, contact, and lead to it in nonlinear bending tube after forming inevitable has some quality problems. The bending radius of big bend pipe fittings as it has some quality same defects, which bend pipe after forming, unload die bending pieces of the rebound is influence bend pipe bend radius of geometric accuracy and precision of the shape a factor. So the big bend pipe bend radius of bending forming in the rebound after research has the very vital significance.

This article mainly aims at large pipe bending radius in push bending forming the generation after springback Angle of a rebound in the finite element simulation for the actual push bend mold on the basis of simplifying the finite element model. Through the ABAQUS/Explicit software to big bending radius of pipe of the springback Angle simulation studies, the main research contents are as follows:

1, through to the relative bending radius R/D, relative wall thickness D/t of finite element simulation, measure their push bending forming of after springback Angle, comparing the parameters on the effect of springback Angle trend.

2, respectively on aluminium tube and stainless steel pipe materials sclerosis index n and strength coefficient K of finite element simulation were compared and analyzed, material parameters on the large pipe bending radius springback Angle influence

3, this paper also to bend pipe at home and abroad and research status of springback Angle in this paper.

4, introduces the main functions of using ABAQUS software