Abstract
In deep hole electrical discharge machining, the electrode jump action and so the movement of the machining debris inside the machining gap affect the concavity of the machined holes. In this study, dielectric fluid flow in machining gap during electrode jump is both experimentally and computationally investigated to understand the concavity phenomenon of the holes. The experimental part consists of high speed camera observation and velocity field visualization of the flow in dummy workpiece-electrode arrangement. In the computational part, the electrode jump motion is modeled and the flow field in gap is simulated using CFD calculations. Both in experimental and computational part, a vortex at lower side gap was observed during the descending period of the electrode jump.
