Solution Model of Principal Stress Method for Torsion-extrusion Forming Load of Magnesium Alloy Plate

doi:10.3901/JME.2021.04.073

Abstract

Abstract: A new torsion-extrusion forming process and the corresponding simulation device are proposed and designed through considering the advantages of extrusion and high-pressure torsion processes. The developed process is suitable for the forming of the sheet magnesium alloy and is beneficial to the microstructure refinement. Based on the characteristics of metal flow in the deformation zone of the torsion-extrusion process, the principal stress method to solve the model of the torsion-extrusion load is established for magnesium alloy. This model divides the deformation zone into four regions. The model without torsion and the one with torsion are derived sequentially, meanwhile, the shear yield strength depends on the effects of temperature and strain rate. By comparing with the experimental load, the error between the computed and the experimental results is less than 8%. The influence of different deformation parameters on the forming load is analyzed through this model. As the rotation speed of the torsion shaft is increased, the shear deformation of the billet is increased and the forming load is decreased. The forming load is increased with the radius and height of the billet. The load is decreased with the increase of the plate width, moreover, it is decreased sharply and then slowly with the increase of the plate height. Furthermore, the billet radius and the plate height have a significant influence on the forming load.

Key words: torsion-extrusion forming, characteristics of metal flow, principal stress method, forming load

CLC Number:

TG376

XU Ningning, SUN Chaoyang, QIAN Lingyun, NI Kezhi, CAI Wang. Solution Model of Principal Stress Method for Torsion-extrusion Forming Load of Magnesium Alloy Plate[J]. Journal of Mechanical Engineering, 2021, 57(4): 73-82.

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