锻压技术

6061铝合金薄壁管-法兰组合接头超低温局部胀-压连接规律

英文标题：Joining law of local bulging and extrusion at ultra-low temperature of thin-walled tube and flange composite joint for 6061 aluminum alloy

作者：程旺军1 张恒源1 刘伟2 高强1 孙耀宁1

单位：1. 新疆大学机械工程学院 2. 哈尔滨工业大学金属精密热加工国家级重点实验室

关键词：超低温局部挤压塑性连接薄壁管薄壁法兰胀形载荷

分类号：TG376.9

出版年,卷(期):页码：2023,48(5):25-30

摘要：

为解决铝合金薄壁管与薄壁法兰的复杂结构难以高效连接的难题，提出了一种铝合金薄壁管与薄壁法兰超低温局部挤压塑性连接新方法，设计了超低温径向胀形和轴向压紧密封塑性连接模具。在室温和超低温（-196 ℃）下，数值模拟分析了铝管-塑料-法兰连接件的中间密封层和胀形载荷对径向胀形和轴向压紧密封后连接件的壁厚分布及损伤因子的影响规律。结果表明：胀形载荷越大，轴向压紧密封外凸量越多，同时对材料的塑性要求越高；材料减薄主要发生在径向胀形阶段，相同条件下的外法兰损伤明显小于内管；超低温下试件抵抗损伤的能力明显高于室温，有效抑制了塑性连接件的破裂缺陷。该工艺对制造铝合金薄壁管与薄壁法兰高质量连接结构具有重要参考价值。

To solve the efficient joining problem of the thin-walled tube and thin-walled flange complex structure for aluminum alloy, a novel plastic joining method of local extrusion at ultra-low temperature for thin-walled tube and thin-walled flange for aluminum alloy was proposed. The plastic jointing dies used in radial bulging and axial compression sealing at ultra-low temperature were designed. The effect laws of middle sealing layer and bulging load on the wall thickness distribution and the damage factor of the joining part after the radial bulging and axial compression sealing for aluminum tube-plastic-flange joining part at room temperature and ultra-low temperature (-196 ℃) were analyzed by numerical simulation. The results show that the larger the bulging load is, the more the convex amount of the axial compression sealing is, and the higher the need of material plasticity is. Likewise, the thinning of materials mainly occurs in the radial bulging stage. The damage of outer flange is significantly smaller than that of the inner tube under the same condition. Meanwhile, the damage resistance of specimens at ultra-low temperature is obviously higher than that at room temperature, which effectively inhibits the fracture defects of plastic joining parts. This process plays an important reference role in the manufacturing of joining structures with high quality for thin-walled tube and thin-walled flange of aluminum alloy.

基金项目：

新疆维吾尔自治区自然科学基金资助项目 (2022D01C653)；中国博士后科学基金面上资助项目 (2022M722666)；新疆维吾尔自治区“天池英才”高层次人才项目（51052300536）

作者简介：程旺军（1987-），男，博士，副教授，E-mail：chengwangjun2008@126.com

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