锻压技术

新型反挤压成形与传统反挤压成形工艺对比研究

英文标题：Comparative study on technology of new type of backward extrusion with traditional backward extrusion

作者：李宏薛勇赵熹张治民

单位：中北大学

分类号：

出版年,卷(期):页码：2016,41(7):34-37

摘要：

分别采用传统反挤压和大塑性变形下的新型反挤压两套模具对2A12铝合金进行了成形实验，制得了两种杯形件，并基于Deform-3D有限元模拟软件对成形过程进行了有限元仿真模拟。通过模拟对比了两种反挤压方法在挤压过程中坯料的变形情况与应变大小，通过拉伸试验与金相试验，对比研究了新型反挤压与传统反挤压杯形件在力学性能、显微组织方面的区别。结果表明，新型反挤压工艺在金属挤压成形过程中对晶粒的细化起到明显的作用，更细、更均匀的晶粒尺寸可以使金属拥有更好的力学性能。因此，新型反挤压工艺可以明显改善所获得杯形件的力学性能。

The traditional backward extrusion experiment and the new type of backward extrusion experiment with large plastic deformation were carried out by two sets of dies respectively，and two kinds of aluminum alloy 2A12 cups were obtained. Furthermore, based on FE simulation, the deformation process was simulated by Deform-3D finite element simulation software, and the deformation and strain of the billets were compared. The mechanical properties, microstructures of samples for the two kinds of cups were comparatively studied by tensile test and metallurgical test. The results show that the effect on the grain refinement is more obvious during metal extrusion forming process through the new type of backward extrusion, and a better mechanical performance can be obtained with finer and more uniform grain size of the cups. Therefore, the new type of backward extrusion process can obviously improve the mechanical properties of the cup.

基金项目：

山西省高等学校科技创新项目（2015160）

李宏（1989-），男，硕士研究生

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