锻压技术

铝粉等通道挤压-正向挤压固结模拟及模具优化设计

英文标题：Consolidation simulation on equal channel angular pressing-forward extrusion for aluminum powder and mold optimization design

作者：王敏慧游晓红王录才方超范明玉

单位：太原科技大学

关键词：纯铝粉末 ECAP-FE 固结成形热力耦合模具结构

分类号：TG376

出版年,卷(期):页码：2019,44(11):128-134

摘要：

等通道挤压-正向挤压（ECAP-FE）工艺可作为金属粉末固结的新工艺。针对纯铝粉末，采用Deform软件对ECAP-FE工艺进行热力耦合有限元模拟分析，剖析铝粉的固结行为。结果显示，ECAP-FE工艺对粉末多孔体具有强烈的致密效果，不同的模具参数对挤压变形的挤压成形力和等效应变均匀性存在不同程度的影响。研究结果表明，挤压比对挤压成形力影响显著，而模具模面角对等效应变均匀性影响较大。分析可得，当采用模具模面角为45°、过渡距离为20 mm、挤压比为6.25的模具结构参数进行组合挤压时，既可以降低挤压成形力，又能提高等效应变均匀性。通过研究分析为模具的设计和铝粉致密化提供了理论依据。

Equal channel angular pressing-forward extrusion (ECAP-FE) can be used as a new process for consolidation of metallic powders. For pure aluminum powder, the finite element simulation analysis on thermal mechanical coupling of ECAP-FE process was carried out by software Deform, and the consolidation behavior of aluminum powder was analyzed. The results show that the ECAP-FE process has a strong densification effect on the powder porous body, and the different mold parameters have various impacts on the extrusion force and equivalent strain uniformity of the extrusion deformation. It is shown that the influence of extrusion ratio on the extrusion force is significant, and the influence of die face angle on the equivalent strain uniformity is large. The analysis shows that when the combined extrusion is conducted by the mold structure parameters with the die face angle of 45°, the transition distance of 20 mm and the extrusion ratio of 6.25, the extrusion force reduces, and the equivalent strain uniformity improves. Thus, the above research and analysis provide a theoretical basis for the mold design and the aluminum powder densification.

基金项目：

山西省科技攻关项目（20140322-20）; 国家级大学生创新创业项目（2018344）

王敏慧（1991-），女，硕士研究生，E-mail：wmh4742@163.com；通讯作者：游晓红（1965-），女，学士，教授，E-mail：283486490@qq.com

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