Abstract: Drill flute has a great influence on the drilling performance of micro-drill, and its profile largely depends on the grinding parameters, wheel profile and position. It is promising to obtain a desired flute profile with a standard wheel by adjusting the wheel position parameters. Based on the relative motion of drill flute and wheel, the grinding mathematical model of flute profile of micro-drill is proposed. Then considering the wheel profile and position, the flute profile is simulated by Matlab software. The radial rake angle and flute width are quantitatively calculated. The simulated results show that the wheel edge width, wheel inclined angle, wheel offset angle and distance have an obvious effect on the flute profile. With the increase of the wheel edge width and wheel inclined angle, the radial rake angle has no obvious change, but the flute width and chip space increase obviously. With the increased wheel offset angle, the radial rake angle increases obviously and the flute width decreases. However, with the increased wheel offset distance, the radial rake angle has no obvious change, but the flute width increases obviously. Based on the established mathematical model of grinding, micro drills with different flute profiles are fabricated, which confirms that the grinding results are in good agreement with the simulation results. The drilling experiment is carried out using the micro drills, which verified that the flute structure has an important influence on the chip removal capacity.

Key words: flute profile, grinding, micro-drill, wheel position parameters, wheel profile parameters