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Performance analysis of the longitudinal-torsional ultrasonic milling of Ti-6Al-4V

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Abstract

Titanium alloy is a typical difficult-to-cut material due to its high strength and high stiffness. To solve the problem of the low efficiency and poor surface quality in the milling of titanium alloy, this paper proposes a novel longitudinal-torsional ultrasonic vibration milling (LTUVM) process. An ultrasonic horn with spiral slots was designed to convert the longitudinal vibration into longitudinal-torsional vibration. The tooltip trajectory was modeled, and the finite elements analysis was used to analyze the cutting mechanism of LTUVM. The simulation results indicate a kind of separation cutting characteristics in every vibration cycle, which is beneficial to reduce the cutting force and improve the surface finish compared with the single longitudinal ultrasonic vibration milling (SLUVM). Then, cutting tests were conducted on Ti-6Al-4V to evaluate the performance of LTUVM. Experimental results demonstrated that the LTUVM could reduce the cutting force by 46–86% compared with the conventional milling (CM) and the SLUVM due to its separation cutting characteristics. Moreover, the surface morphology was analyzed, and a fractal dimension (FD) method was proposed to characterize the regularity and fragmental property of the machined surfaces. The surface morphology analysis results showed that the LTUVM can be used as a novel high-efficiency and high-quality surface texturing method for Ti-6Al-4V. The textured surface of the LTUVM has the superiority of high integrity and periodicity, which could be applied to effectively tune the tribological property of surface.

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Funding

This work was supported by National Natural Science Foundation of China [Grant No. 51705281; Grant No. 51875311] and Shenzhen Foundational Research Project (Discipline Layout) [Grant No. JCYJ20180508152128308]. The third author (Jianjian Wang) would like to acknowledge the fellowship support from Alexander von Humboldt Foundation.

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Authors and Affiliations

  1. Graduate School at Shenzhen, Tsinghua University, Shenzhen, 518055, China

    Yu Pang, Pingfa Feng, Huiting Zha & Jie Xu

  2. Shenzhen Nanshan Foreign Language Senior High School, Shenzhen, 518023, China

    Yu Pang

  3. Department of Mechanical Engineering, Tsinghua University, Beijing, 100084, China

    Pingfa Feng & Jianjian Wang

  4. Institute of Production Science, Karlsruhe Institute of Technology, 76131, Karlsruhe, Germany

    Jianjian Wang

  5. College of Mechanical Engineering, Hunan Institute of Engineering, Xiangtan, 411100, China

    Jie Xu

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  1. Yu Pang
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  2. Pingfa Feng
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  4. Huiting Zha
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  5. Jie Xu
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Contributions

Conceptualization, Y.P. and P.F.; methodology, J.W.; validation, Y.P., J.X. and J.W.; investigation, Y.P. and H.Z.; resources, J.X.; supervision, H.Z.; project administration, P.F. All authors have read and agreed to the published version of the manuscript.

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Correspondence to Jianjian Wang or Huiting Zha.

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Pang, Y., Feng, P., Wang, J. et al. Performance analysis of the longitudinal-torsional ultrasonic milling of Ti-6Al-4V. Int J Adv Manuf Technol 113, 1255–1266 (2021). https://doi.org/10.1007/s00170-021-06682-7

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