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中文摘要：
通过二维建模软件建立管材扩口成形模型,采用大型有限元数值模拟软件对无圆角管材扩口及有圆角管材扩口成形过程进行了数值模拟,获得了其变形材料内部的温度场、应力场、应变场及上模载荷-行程的变化规律。研究结果表明：与无圆角扩口成形相比,有圆角扩口成形具有成形载荷小、应力数值小与应变分布均匀等优点。并进行了相应的工艺实验研究,为有圆角扩口成形技术在工业生产中的应用提供了理论依据。
英文摘要：
A mold of swelling forming process of tubes was built by 2D software, and the swelling forming processes of tubes without round angle and with round angle were simulated based on FEM （Finite Element Method） numerical simulation software. Changing laws of temperature field, stress field, strain field and load-stroke curve of upper die of the deforming material were obtained. The results indicate that the swelling forming with round angle has some advantages, such as smaller loads, smaller stress and well-proportioned strain compared with the swelling forming without round angle. In the meantime, the technology was researched experimentally which provided a theoretical basis for the industrial applications of the swelling forming with round angle technology.
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