锻压技术

6005A 铝合金薄壁型材压弯成形有限元分析及试验

英文标题：Finite element analysis and experiment on press bending for 6005A aluminium alloy thin-walled profile

单位：1. 南南铝业股份有限公司 2. 中国航发贵州黎阳航空动力有限公司 3. 重庆大学

分类号：TG146. 2

出版年,卷(期):页码：2023,48(1):128-135

摘要：

针对薄壁型材在压弯过程中易产生的截面畸变缺陷, 借助于Deform-3D 有限元模拟软件及压弯设备, 重点探讨了6005A 铝合金薄壁型材(厚度为2.5 mm) 的型材结构、填充材料及填充方式对压弯后型材结构畸变的影响。结果表明: 除PU 外, PA6、PP 及PVC 均具有较高的屈服强度(≥21 MPa), 在压弯过程中可有效支撑薄壁型材以降低型材结构的畸变率。由于型材上、下表面在弯曲过程中受力不一致, 造成上、下模接触面的截面畸变规律有所区别。不同型材结构(未填充) 压弯后, 上、下模接触面的截面畸变率与填充压弯时截面畸变率的变化规律基本一致, 这说明更改型材结构可略微降低截面畸变率, 但改善效果并不明显。采用方案9 (型材结构2、PP-填充方式2) 压弯后的截面畸变情况明显改善且优于方案8 (型材结构1、PP-填充方式1), 并对方案9 进行试验验证, 发现压弯后型材结构的截面畸变率较方案5 (原始结构-未填充) 改善明显且满足设计需求。

For the problem that the thin-walled profiles were easy to occur the section distortion defects in the press bending process, the influences of 6005A aluminium alloy thin-walled (the thickness of 2. 5 mm) profile structure, filling material and filling method on the structural distortion of profile after press bending were explored by finite element simulation software Deform-3D and press bending equipment. The results show that except for PU, the filling material of PA6, PP and PVC all have high yield strength (≥21 MPa) and can effectively support thin-walled profiles during the press bending process to reduce the section distortion rate. Due to the inconsistent of the force on the upper and lower surfaces of profile during the press bending process, the section distortion law for the contact surface of the upper and lower dies is different. The variation law of section distortion rate at the contact surface of the upper and lower dies after press bending with different profile structures (without filling) is basically the same as that during the filled press bending, which shows that changing the profile structure can slightly reduce the section distortion rate, but the improvement is not obvious. The section distortion condition in scheme 9 (profile structure 2, PP-filling method 2) after press bending is significantly better than that in scheme 8 (profile structure 1, PP-filling method 1), and through the verification test of scheme 9, the section distortion rate after press bending is significantly better than that in scheme 5 (original structure-without filling) and meets the design requirements.

基金项目：

南宁市科学研究与技术开发计划项目(20221028)

作者简介: 廖　斌(1992-), 男, 博士, 副高级工程师 E-mail: bin. liao@ foxmail. com 通信作者: 吴晓东(1974-), 男, 博士, 副研究员 E-mail: xiaodongwu@ cqu. edu. cn

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