摘要
波形微通道扁管成为新一代热交换系统关键零部件,但是成形过程中截面畸变严重且受摩擦条件影响。本文建立了基于实验验证的3003-H14铝合金微通道薄壁扁管波形冲压成形-回弹有限元模型,模拟分析了动模-管坯摩擦系数μ_(1)和定模-管坯摩擦系数μ_(2)对截面畸变率分布和平均截面畸变率δh的影响。研究发现,筋的出现大大降低了扁管横截面的截面畸变量,但是对边缘孔的约束作用较弱。纵截面的畸变呈现为有规律的高低波动状态。对于横截面畸变,μ_(1)越大,δh越大;δh随着μ_(2)的增大,先减小后增大。在降低扁管整体的横截面畸变率时,应该考虑摩擦对之间的配合影响。对于纵截面畸变,μ_(1)和μ_(2)越大,δh越大。动、定模与管坯之间的润滑条件越好,越有利于降低纵截面畸变。μ_(1)=0.02、μ_(2)=0.02和μ_(1)=0.02、μ_(2)=0.17均为微通道扁管的最佳摩擦工艺条件。本研究能够为波形微通道薄壁扁管的精确成形提供借鉴。
The wave-shaped micro-channel flat tube has become a key component of the new generation of heat exchange system, but the section distortion during the forming process is severe and affected by friction conditions. In this study, a finite element model of wave stamping-springback of 3003-H14 aluminum alloy micro-channel thin-walled flat tube was established and verified based on experiment. The influences of dynamic mold-tube friction coefficient μ_(1)and fixed mold-tube friction coefficient μ_(2)on the distribution of section distortion rate and the average section distortion rate δh were simulated and analyzed. Results show that the appearance of ribs reduced the cross-sectional distortion of the flat tube, but the restraint effect on the edge holes was weak. The distortion of the longitudinal section exhibited regular high and low fluctuations. For cross-sectional distortion, δh increased with the increase in μ_(1), and first decreased and then increased with the increase in μ_(2). When reducing the overall cross-sectional distortion rate of the flat tube, the effect of friction should be considered. For distortion of longitudinal section, the larger μ_(1)and μ_(2)were, the larger δh was. Under better lubricating conditions between the dynamic and fixed molds and the tube, it was more conducive to reducing the distortion of the longitudinal section. The optimal friction process conditions for the micro-channel flat tube were: μ_(1)=0.02, μ_(2)=0.02 and μ_(1)=0.02, μ_(2)=0.17. This study can provide a reference for the precise forming of thin-walled flat tubes with wave-shaped micro-channels.
作者
程传峰
金明
王项如
朱英霞
程一峰
盘朝奉
王园
徐凡
CHENG Chuanfeng;JIN Ming;WANG Xiangru;ZHU Yingxia;CHENG Yifeng;PAN Chaofeng;WANG Yuan;XU Fan(Anhui XMAX New Energy Technology Co.,Ltd.,Anqing 246001,China;Anhui ARN Group Co.,Ltd.,Anqing 246001,China;School of Mechanical Engineering,Jiangsu University,Zhenjiang 212013,China;Automotive Engineering Research Institute,Jiangsu University,Zhenjiang 212013,China)
出处
《材料科学与工艺》
CAS
CSCD
北大核心
2023年第1期63-70,共8页
Materials Science and Technology
基金
国家自然科学基金资助项目(51601070,51875263)
江苏省自然科学基金资助项目(BK20181447)。
关键词
微通道扁管
薄壁材料
冲压
截面畸变
摩擦边界条件
micro-channel flat tube
thin-walled material
stamping
section distortion
friction boundary condition
