Abstract: Mechanisms of micro-hole vibration drilling with three stages, which are entrance, drilling and exit, are analyzed. Optimal vibration parameters of the stages are determined by experiments of regressive method. A new method for vibration drilling is put forward. The method is that vibration parameters are changed with the stages of drilling hole so that the parameters of the stages are kept to be optimal. Present investigation shows that the new method overcomes drawbacks of ordinarily drilling and is effective way improving quality of drilling micro holes.

Key words: Drilling micro hole, Machining quality, Vibration drilling