摘要
内螺纹铜管传热面积大,可以造成紊流效果,提高换热效率,是空调、冰箱的主要换热介质。旋压成型是制造内螺纹铜管的高效成型工序。为研究内螺纹铜管旋压成型过程中的材料流动规律,运用非线性有限元分析软件,对内螺纹旋压成型过程进行了仿真。结果表明,在旋压过程中,铜管经历了类似于行星辊轧的,从圆形到多边形,最后恢复圆形的过程;此外铜管除了发生横截面方向弯曲外,还发生轴向运动,两者叠加产生了羽片扭转;当铜管材料填满螺纹槽后,多余的材料沿旋压方向流动,将耗费过多的能量。减少管坯的直径和壁厚,可以减少截面方向弯曲,并可以减少壁厚过大导致多余材料周向流动的能量损失。文章讨论了旋压速度的选取,认为尽可能选用低的旋压速度,可以减少羽片扭转。
The nonlinear finite element method is used to simulate the manufacturing process.The results show that,in the spin forming process,the deformation of the copper tube is similar to the process of planetary roller rolling,in which the round shape changed into the polygon and recover in the final process.In addition to the bending deformation in the cross sectional direction,the copper tube also deforms in the axial motion.The overlap of those displacements created the torsion of fins.During the deformation,some of the materials fill the inner groove,while the excessive material flowalong the spinning direction,which may consume too much energy.Decrease the tube diameter and the wall thickness may reduce the bending in cross-sectional direction,and the energy loss due to the circumferential flow of the excessive materials.The article also discusses the selection of spinning speed and reducing the torsion of fins using lower spinning speed.
出处
《塑性工程学报》
CAS
CSCD
北大核心
2010年第4期76-81,共6页
Journal of Plasticity Engineering
基金
国家自然科学基金资助项目(50905033)
广东省自然科学基金资助项目(8451009001001414)
教育部博士点专项基金资助项目(20094420120001)
粤港招标资助项目(20070103-1)
中山市产学研专项基金资助项目(2009CXY018)
关键词
内螺纹铜管
旋压成型
有限元模拟
工艺参数
inner grooved copper tube
spin forming process
FEM simulation
process parameters
作者简介
杨志军E-mail：yangzj@gdut．edu．cn 杨志军，男，1977年牛，副教授，博士，从事机电产品建模仿真及优化技术研究
