锻压技术

带I型纵筋薄壁构件挤压成形数值模拟与工艺优化

英文标题：Numerical simulation and process optimization on extrusion forming for thin-walled component with I-type longitudinal ribs

作者：李贵重邓加东钱东升

单位：武汉理工大学现代汽车零部件技术湖北省重点实验室

关键词：带I型纵筋薄壁构件挤压成形铝合金 HyperXtrude软件正交优化

分类号：TG376

出版年,卷(期):页码：2019,44(4):83-89

摘要：

带I型纵筋薄壁构件的结构复杂、壁厚不均，在挤压过程中容易发生金属流动不均匀现象，导致型材发生翘曲变形。针对该问题，采用HyperXtrude有限元分析软件，研究了挤压速度、坯料初始温度和模具初始温度等工艺参数对挤压成形效果的影响规律，发现坯料初始温度的增大会使金属流速更加均匀，而过大的挤压速度和模具初始温度会加大金属流速的不均匀性。通过正交试验获得最佳成形工艺参数组合：挤压速度为2 mm·s-1，坯料初始温度为480 ℃，模具初始温度为440 ℃。最后进行了相应的挤压试验，并成功获得高精度带I型纵筋薄壁构件样品。该研究工作为此类构件的挤压成形工艺及模具的优化设计提供了理论参考。

The thin-walled component with I-type longitudinal ribs has complex structure and uneven wall thickness, and it is easy to occur uneven metal flow during extrusion process, which leads to warping deformation of profile. For the above problem, the influences of process parameters such as extrusion speed, initial temperature of blank and initial temperature of die on the extrusion forming effect were studied by finite element analysis software HyperXtrude. It is found that the increase of initial temperature of blank makes the metal flow velocity more uniform, while the excessive extrusion speed and initial temperature of die increase the non-uniformity of metal flow velocity. Furthermore, the optimum combination of forming process parameters was obtained with the extrusion speed of 2 mm·s-1, the initial temperature of blank of 480 ℃ and the initial temperature of die of 440 ℃ by orthogonal test. Finally, the corresponding extrusion tests were carried out, and the high-precision samples of thin-walled component with I-type longitudinal ribs were successfully obtained. This research work provides a theoretical reference for the extrusion forming process and the die optimization design of such components.

基金项目：

国家自然科学基金资助项目（51805391）；中央高校基本科研业务费专项资金资助（2018lll003CG）；高等学校学科创新引智计划资助（B17034）

李贵重（1992-），男，硕士研究生 E-mail：liguichong99@163.com 通讯作者：邓加东（1988-），男，博士，讲师 E-mail：dengjd88@126.com

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