Metrological investigation of an actuator device for vibration assisted turning

Abstract

Vibration assisted machining has the advantages of improved tool lifetime and chip breaking together with improved chip flushing and chip clearance. The basic principle of vibration assisted machining is the stimulation of either the cutting tool or the workpiece. Therefore the IFT developed a hydraulic based tool post actuator system making it possible to investigate the influence of superimposed frequencies on surface roughness and chip breaking. Frequencies of 0 to 30 Hz were applied while measuring the stroke of the tool post using laser interferometry. The results show that there is a significant dependency between the frequency of the tool post actuator system and the stroke value. Machining a specimen with vibration assistance showed better surface quality at higher frequencies and lower strokes. Moreover, vibration assisted machining had a significant influence on chip breaking causing eye shaped chips with comparably shorter length thus preventing continous chips completely.

Keywords

• vibration assisted machining
• laser interferometry
• chip breaking
• tool lifetime
• surface roughness