摘要
为探究5052铝合金T型三通管内高压成形规律,采用Dynaform模拟软件建立了内高压成形有限元模型,研究了模具过渡圆角半径、摩擦系数、内压力和轴向进给量加载方式对成形的影响。结果表明,模具过渡圆角半径较小时(R=4 mm),不利于支管的贴膜成形,采用半径为10 mm的圆角更有利于材料流动及支管贴膜成形;减小成形过程中的摩擦系数不仅可以使T型三通管壁厚分布更加均匀,亦可提高支管的高度;采用上凸式内压力加载曲线和滞后下凹式轴向进给量加载曲线可提高内压力的加载速度,避免由于管内压力不足导致进给的管料过多而产生支管起皱现象。最后,采用尺寸为Φ60 mm×1.5 mm的管材进行实验,实验结果与模拟结果基本一致,验证了模拟的准确性和可靠性。
To explore the internal high pressure forming laws of 5052 aluminum alloy T-shape tube,a finite element model of internal high pressure forming was established by Dynaform simulation software to study the influence of transition fillet radius of die,friction coefficient,the loading mode of internal pressure and axial feeding on forming.The results show that when the transition fillet radius of die is smaller(R=4 mm),it is not conducive to the attachment forming of branch tube,and the fillet radius of 10 mm is more conducive to the material flow and attachment forming of branch tube.Reducing the friction coefficient during forming can not only make the wall thickness distribution of the T-shape tube more uniform,but also improve the height of branch tube.The upward convex internal pressure loading curve and the delaying downward concave axial feeding loading curve can increase the loading speed of internal pressure,avoiding the wrinkling phenomenon of branch tube caused by too much feed tube material due to insufficient pressure in tube.Finally,the tube with the size ofΦ60 mm×1.5 mm was used to carry out the experiment.The experimental results are basically consistent with the simulation results,which verifies the accuracy and reliability of simulation.
作者
李晓冬
徐雪峰
华如雨
范玉斌
张举
肖洁
LI Xiao-dong;XU Xue-feng;HUA Ru-yu;FAN Yu-bin;ZHANG Ju;XIAO Jie(National Defense Key Disciplines Laboratory of Light Alloy Processing Science and Technology,Nanchang Hangkong University,Nanchang 330063,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2021年第3期41-49,共9页
Journal of Plasticity Engineering
基金
国家自然科学基金资助项目(51975267)
江西省研究生创新专项资金资助项目(YC2019-S334)
轻合金加工科学与技术国防重点学科实验室开放课题研究基金(EG201903452)。
关键词
5052铝合金管
内高压成形
模具过渡圆角半径
摩擦系数
加载方式
5052 aluminum alloy tube
internal high pressure forming
transition fillet radius of die
friction coefficient
loading mode
