Modal Analysis of Wire Electrode Vibration in Wire-EDM.

Abstract

In wire electrical discharge machining (wire-EDM), it is very important for the improvement of machining accuracy to restrain the vibrations of a tool wire electrode. In this paper, we analyze the measured values of a wire electrode displacement with normal vibration modes, and investigate the fundamental characteristics of the vibration system through statistical analysis. An averaged external force, which acts on the wire electrode in real machining, depends on the direction of the wire movement in vibration. The phase lag between the external force caused by electrical discharge and the corresponding displacement is extremely important for the restraint of the wire vibration.