Study on micro drilling

Influence of centripetal action on hole position accuracy

Abstract

This study aims to attain high accuracy and efficiency for precision micro drilling of small holes measuring under 0.1 millimeters in diameter such as those formed in a fuel injector for an automotive engine. In this study, drilling experiments were designed to investigate the effect of the centripetal action on hole position accuracy. The experimental results obtained are as follows, (1) The model of centripetal action by the tool elastic deformation is proposed. (2) The centripetal action is high at A5052 because a resistance of tool-top transfer is large. (3) The centripetal action is low when radial run-out is small.