电磁感应辅助加热镁合金内螺纹挤压过程的有限元分析及螺纹性能研究

Finite Element Analysis of Extrusion Process for Magnesium Alloy Internal Threads with Electromagnetic Induction-Assisted Heating and Thread Performance Research.

作者信息

Liu Meng, Ji Zesheng, Fan Rui, Wang Xingguo

机构信息

Departments of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 100080, China.

Departments of Mechanical and Electrical Engineering, Qiqihar University, Qiqihar 161006, China.

出版信息

Materials (Basel). 2020 May 8;13(9):2170. doi: 10.3390/ma13092170.

DOI:10.3390/ma13092170

PMID:32397214

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7254356/

Abstract

The casting magnesium alloy AZ91D cannot be extruded at room temperature. This paper presents a process for extruding internal threads using AZ91D heated by electromagnetic induction. The feasibility of the process is verified by finite element simulation and experiments. Using DEFORM-3D to simulate the process of extruding a M12 × 1.25 mm threaded hole by electromagnetic induction-assisted heating, the equivalent stress-strain and material flow law in the process of thread deformation was analyzed and verified by experiments. Three parameters-hole diameter, machine speed and heating temperature-were considered to study the influence of different process conditions on the forming torque. The results show that a heating temperature above 523 K can improve the plasticity of AZ91D. The hole diameter has an important influence on the forming torque. The forming process is not suitable for high-speed machining. The surface metal of the thread formed by this process has a strong deformation layer, which can improve the strength and hardness of the thread.

摘要

铸造镁合金AZ91D在室温下无法进行挤压。本文提出了一种利用电磁感应加热的AZ91D来挤压内螺纹的工艺。该工艺的可行性通过有限元模拟和实验得到了验证。利用DEFORM-3D模拟电磁感应辅助加热挤压M12×1.25 mm螺纹孔的过程，分析了螺纹变形过程中的等效应力应变和材料流动规律，并通过实验进行了验证。考虑了孔径、机床速度和加热温度三个参数，研究了不同工艺条件对成形扭矩的影响。结果表明，加热温度高于523 K可提高AZ91D的塑性。孔径对成形扭矩有重要影响。该成形工艺不适用于高速加工。通过该工艺形成的螺纹表面金属具有较强的变形层，可提高螺纹的强度和硬度。