挤压速度对6063铝合金管材焊合强度的影响

发布时间：2018-05-29 08:05

本文选题：铝合金 + 挤压　；参考：《中国有色金属学报》2017年09期

【摘要】：通过建立6063铝合金多孔分流模挤压过程的三维有限元模型,研究不同挤压速度下挤压力、焊合面温度、焊合压力和材料有效应力等参数的演变规律及其对焊合质量的影响,建立预测铝合金方管焊合质量的评价模型,并采用膨胀实验验证模型的准确性。结果表明:随着金属流入分流孔、焊合室和定径带,挤压力逐渐增大并达到峰值,而后缓慢降低;随着挤压速度的增大,焊合面温度、焊合压力和有效应力逐渐升高,焊合质量系数k值逐渐降低。膨胀结果表明,最大载荷处的位移与k值呈正相关,说明所建立的k值模型具有较高的精度。
[Abstract]:By establishing a three-dimensional finite element model of the extrusion process of 6063 aluminum alloy porous split die, the evolution law of extrusion force, welding surface temperature, welding pressure and effective stress of material and the effect of welding quality on the extrusion quality were studied under different extrusion speeds. An evaluation model was established to predict the welding quality of aluminum alloy square pipe, and the accuracy of the model was verified by expansion test. The results show that the extrusion force increases gradually and reaches the peak value with the metal flowing into the flow hole, the welding chamber and the fixed diameter zone, and then decreases slowly, and with the increase of extrusion speed, the welding surface temperature, welding pressure and effective stress increase gradually. The welding mass coefficient k value decreases gradually. The expansion results show that the displacement at the maximum load is positively correlated with the k value, which indicates that the established k value model has a high accuracy.
【作者单位】：湖南大学汽车车身先进设计制造国家重点实验室;湖南大学机械与运载工程学院;宁夏大学机械工程学院;
【基金】：国家自然科学基金重点资助项目(U1664252);国家自然科学基金面上资助项目(51475156);国家自然科学基金青年基金资助项目(51605234) 国家重点研发计划项目(2016YFB0101700) 湖南大学汽车车身先进设计制造国家重点实验室开放基金资助项目(31515007)~~
【分类号】：TG379

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