Modal Analysis of Wire Electrode Vibration in Wire-EDM

In wire electrical discharge machining (wire-EDM), it is very important to restrain the vibrations of a tool wire electrode for the improvement of machining accuracy. In this paper, we analyze the measured displacement of a wire electrode in the machining process for a thin plate with normal vibration modes. The fundamental characteristics of the vibration system are investigated through statistical analysis. 1st mode displacement behavior which is simulated under the external force caused by electrical discharge is compared with measured displacement.The force in real machining depends on the direction of the wire movement in vibration. The phase difference between the external force and the displacement is extremely important for the restraint of the wire vibration.