Abstract
Titanium alloy threaded fasteners offer great advantages to the field of aerospace. But the use of cold rolling process when forming threaded fasteners has the disadvantages of short die life and high apparatus requirements because of poor plasticity of titanium alloy at room temperature. This paper uses a combination of axial infeed rolling process and intermediate frequency induction heating to fabricate thread with Ti6Al4V. First, the principle of hot rolling process is introduced, and then the characteristics of induction heating and the strain, displacement, and metal flow law of the thread during hot rolling process are analyzed by using finite element analysis. The influence of different forming temperatures on the rolling torque and the major diameter of the formed thread are analyzed. According to the results of finite element analysis, the best forming temperature for hot rolling process is 800 °C. Moreover, experiments are carried out on related equipment, and the experimental results are similar to the simulation results. The torque is reduced by 74% relative to that in cold rolling process. Finally, the microstructure and hardness of the formed thread are observed. A dense and directional microstructure appeared on the surface of the formed thread. The overall hardness of the thread after hot rolling is higher than that of cold rolling, and the maximum hardness of formed thread is increased by 35% relative to that of the original metal.
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This work was supported by the Joint Fund for Aerospace Advanced Manufacturing Technology Research Key Program (grant no.U1937203).
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Jiang Fei analyzed, researched, and wrote this paper; Shuowen Zhang and Jinzhou Gao analyzed, researched, and polished the paper; Shengdun Zhao supervised the paper; Hong Jiang and Liangyu Fei assisted with the experiment. All authors read and approved the final manuscript.
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Jiang, F., Zhao, S., Zhang, S. et al. Finite element analysis and experiment study on axial infeed hot rolling process of thread with Ti6Al4V. Int J Adv Manuf Technol 121, 5873–5884 (2022). https://doi.org/10.1007/s00170-022-09615-0
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DOI: https://doi.org/10.1007/s00170-022-09615-0