Buckling Characteristics of Microdrills by Using Finite Element Method

In recent years, microdrill becomes a very important element in the process of drilling apertures of PCB integrated circuits. But different material property will often generate collapse or fracture of the drill tip. This study is about to establish a finite element model (FEM) and to get the buckling stress analysis of the microdrill by ANSYS software. Since the microdrill is a structural brittle material and easy to be broken, force over buckling critical load is employed to explore the structural weakness and to analyze its stress damage. In addition, vibration, occurred at high-speed micro drilling, could easily lead to the excessive deflection or feeding amount of the drill tip, cause the collapse or rupture of the microdrill, and lower the quality by reaming the machining object. Poor geometric aspect ratio of the drill tip will generate different loads in different parts. How to manage the pressure for the microdrill to apply the force stably and to avoid the breakage and destruction is very important both for the tool life and the cost control. Therefore, how to overcome the buckling of tiny structure component under loading becomes a great issue to be explored.