轻合金矩形管件充液压制成形缺陷及横截面尺寸控制

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中文摘要：管材充液压制是一种先进的低载荷液压成形工艺,可用于整体成形复杂薄壁管状构件.与内高压成形不同,充液压制过程中内压只起支撑作用避免失稳屈曲,主要通过模具压制获得管件外形轮廓.压制过程管坯厚向存在拉-压应力梯度,导致卸载后管件截面易产生回弹,影响尺寸精度.本研究通过对5052、AZ31B和TA1三种管材进行充液压制成形实验,分析了支撑内压和环向压缩率对矩形管件横截面尺寸的影响规律.结果表明:当支撑内压为0.6ps～0.8ps时,管件截面的回弹最小,此时最大回弹量小于1.5 mm,对应回弹率小于5.2%,上、下圆角半径相差小于0.1 mm.通过控制环向压缩率可减小管件回弹,截面尺寸与设计尺寸相差小于0.2 mm,尺寸偏差小于0.7%.对于5052-H、5052-O、AZ31B-M和TA1-Y矩形管件,其控制尺寸精度所需的环向临界压缩率分别为1.8%、1.7%、1.9%和1.8%.

外文标题：Forming defects and cross-sectional dimension control in hydro-pressing forming of light alloy rectangular tubular components

外文摘要：Tube hydro-pressing is an advanced less-loading hydroforming process.It can be used for integral forming of the thin-walled tubular components with complex shape.Different from the high-pressure hydroforming,the internal pressure only plays a supporting role in the tube hydro-pressing process to avoid buckling instability,and the components is mainly formed by the die pressing to form the complex contour.However,there is a stress gradient of tensile and compressive stress in the thickness direction of the tube during the hydro-pressing process,which cause the springback on the cross-sections easily after unloading.This can affect the dimensional accuracy of the components.In this investigation,the hydro-pressing experiment was conducted on three light alloy tubes,including 5052 aluminum alloy,AZ31B magnesium alloy and TA1 titanium alloy.The effects of internal supporting pressure and circumferential compression ratio on the cross-sectional dimension of rectangular tubular components were analyzed.The results show that the tubular components have the smallest springback when the internal supporting pressure is between 0.6ps and 0.8ps.The maximum springback amount is less than 1.5 mm,and the corresponding springback ratio is less than 5.2%.Moreover,the difference between the upper and lower corner radius is less than 0.1mm.The springback of the tubular components can be reduced by controlling the circumferential compression ratio during the hydro-pressing process.In this case,the difference between the actual cross-sectional dimension and the design value after spring back is less than 0.2mm,which corresponds to a dimension deviation of less than 0.7%.For the 5052-H,5052-O,AZ31B-M and TA1-Y rectangular tubular components,the critical circumferential compression ratios required to control dimensional accuracy are 1.8%,1.7%,1.9%and 1.8%,respectively.

外文关键词：

hydro-pressing forminglight alloy tubeforming defectdimensional accuracyinternal supporting pressure

作者：

温时宇、崔晓磊、林鹏

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作者单位：

哈尔滨工业大学金属精密热加工国家级重点实验室,哈尔滨 150001

太原理工大学材料科学与工程学院,太原 030024

关键词：

充液压制成形轻合金管材成形缺陷尺寸精度支撑内压

基金：

黑龙江省自然科学基金资助项目哈尔滨工业大学科研创新基金资助项目中国博士后科学基金资助项目金属精密热加工国家级重点实验室基金资助项目

项目编号：

LH2022E057HIT.NSRIF2023212023T160158JCKYS2021603C002

出版年：

2024

DOI：

10.11817/j.ysxb.1004.0609.2023-44615

中国有色金属学报

中国有色金属学会

中国有色金属学报

CSTPCD北大核心

影响因子：1.108

ISSN：1004-0609

年,卷(期)：2024.34(6)