Transactions of Materials and Heat Treatment

Title：Forging process design and material deformation rules of aluminum alloy axle box body for high speed train

Authors： Xu Xiao Yang Zhao Cheng Rence Lyu Zhengfeng Zhao Wei Jiao Juanjuan Zhao Guoqun

Unit： Shandong University Shandong Nanshan Aluminum Co. Ltd.

KeyWords： aluminum alloy 7050 axle box body of high speed train forging process preforming design volume distribution

ClassificationCode：TG316

year,vol(issue):pagenumber：2018,43(1):14-19

Abstract：

For a axle box body with complex shape and structure of high strength aluminum alloy 7050, thermal simulation tests with deformation temperatures of 300-450 ℃ and strain rates of 0.01-10 s-1 were carried out by Gleeble-1500 thermal simulated test machine. Then, the true stress-strain curves under different deformation temperatures and strain rates were obtained, and the Arrhenius constitutive model with strain compensation of aluminum alloy 7050 was established. Furthermore, the shape of performed blank for axle box body which could reasonably distribute the material volume was proposed, and the corresponding extrusion and pre-forging process and die structure were designed. Finally, the metal flow rules in the forging process of axle box body were analyzed by numerical simulation. The study shows that the pre-forging obtained by extrusion process can satisfy the volume distribution requirement of final forging with forging cavity filled completely, reasonable streamlines distribution and without folding defects. Thus, the forging process is simplified as free forging flatting, extrusion blanking and final forging, and the processing cycle is shortened. When there is lack of multi-directional forging equipment in factory, it presents a feasible method for the production of axle box body forgings.

Funds：

作者简介：徐潇（1992-），女，博士研究生，E-mail：xuxiao20151992@163.com。通讯作者：赵国群（1962-），男，博士，教授，E-mail：zhaogq@sdu.edu.cn

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