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

• Published in: Journal of mechanical science and technology Vol. 30; no. 5; pp. 2257 - 2263
• Main Authors: Lee, Ju-Chul, Park, Sang-Hu, Min, June Kee, Ha, Man Yeong, Shin, Bosung, Cho, Jong-Rae
• Format: Journal Article
• Language: English
• Published: Seoul Korean Society of Mechanical Engineers 01.05.2016; Springer Nature B.V; 대한기계학회
• Subjects: Channels; Control; Cooling; Devices; Dynamical Systems; EDM electrodes; Electric discharge machining; Electrodes; Engineering; Friction factor; Industrial and Production Engineering; Injection molding; Mechanical Engineering; Molds; Turbine blades; Turbines; Vibration; Walls; 기계공학; Perpendicular vibration-induced EDM; Heat transfer enhancement; Cooling channel; Energy saving; Wavy inner structures
• ISSN: 1738-494X; 1976-3824
• DOI: 10.1007/s12206-016-0435-8

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.