Abstract
The dynamic characteristics of a drill drilling through out a work-piece are investigated in this study. In manufacturing, drill breakage is frequently found in actual drilling process. To improve quality, produce a higher production rate and avoiding drill breakage, the dynamic characteristics in the drilling process must be studied, especially for a drill with cracks. A pre-twisted beam is used to simulate the drill. A moving Winkler-Type elastic foundation is used to approximate the drilling process, time dependent boundary. In this article, a time dependent vibration model for drilling is presented. The effects of crack, rotating speed, pre-twisted angle and thrust force of the drill are considered. Numerical analysis indicates that the vibration amplitude is enlarged suddenly as the drill moves into a work piece. Vibration amplitude of the drill with a crack become much larger than of that without cracks in drilling process is found.
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