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Development of a perpendicular vibration-induced electrical discharge machining process for fabrication of partially wavy inner structures

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Abstract

Heat transfer enhancement is an important issue in energy systems. To improve the efficiency of a cooling channel used inside injection molds, turbine blades, and high-temperature devices, channels with various shapes, such as wavy, elliptical, and twisted, have been studied. A cooling channel with a partially wavy inner structure has shown outstanding cooling performance despite a small increase in friction factor. However, generating a partially wavy inner structure inside a channel through conventional machining processes is not easy. To address this problem, we developed a new process called Perpendicular vibration-induced electrical discharge machining (PV-EDM). A specific electrode and one- and random-directional vibrating devices controlled by a pneumatic load were designed for the PV-EDM process. Experimental results showed that local shaping on the inner wall of a channel is possible, which confirmed the possibility of application of this process to actual industrial problems.

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Author information

Authors and Affiliations

  1. Graduate School of Mechanical Engineering, Pusan National University, Geumjeong-gu, Busan, 609-735, Korea

    Ju-Chul Lee

  2. School of Mechanical Engineering, Pusan National University, Geumjeong-gu, Busan, 609-735, Korea

    Sang-Hu Park & Man Yeong Ha

  3. PNU and Rolls-Royce UTC, Pusan National University, Geumjeong-gu, Busan, 609-735, Korea

    June Kee Min

  4. Department of Cogno-Mechatronics/Optics and Mechatronics Engineering, Pusan National University, Geumjeong-gu, Busan, 609-735, Korea

    Bosung Shin

  5. Division of Mechanical & Energy Systems Engineering, Korea Maritime University, Yeongdo-gu, Busan, 606-791, Korea

    Jong-Rae Cho

Authors
  1. Ju-Chul Lee
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  2. Sang-Hu Park
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  3. June Kee Min
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  4. Man Yeong Ha
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  5. Bosung Shin
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  6. Jong-Rae Cho
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Corresponding author

Correspondence to Sang-Hu Park.

Additional information

Recommended by Editor Haedo Jeong

Ju-Chul Lee earned his B.S. (2010) and M.S. (2014) from the School of Mechanical Engineering in Pusan National University. His research topic interests include the vibration-induced EDM process and cooling channel design. Presently, he is the CEO of a turbo machinery company.

Sang Hu Park is a professor of mechanical engineering in Pusan National University. He earned his M.S. and Ph.D. in mechanical engineering at Korea Advanced Institute of Science and Technology in 1996 and 2006, respectively. His research fields include the development of 3D printing process and mechanical design and manufacturing technology, specifically for multiscale structures.

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Lee, JC., Park, SH., Min, J.K. et al. Development of a perpendicular vibration-induced electrical discharge machining process for fabrication of partially wavy inner structures. J Mech Sci Technol 30, 2257–2263 (2016). https://doi.org/10.1007/s12206-016-0435-8

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  • DOI: https://doi.org/10.1007/s12206-016-0435-8

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