Study on Micro Drill Machining

The experiment of Rotary Bending Fatigue strength of micro carbide drill

Abstract

In small holes drilling, the run-out of drill due to rotational motion error of spindle or eccentric chucking of drill caused machining error and larger radial force which may break the drill. In this report, relationship between bending deflection and radial cutting force, and fatigue fracture of drill were investigated theoretically and experimentally. The objective, of the paper is to find out the relation in bending, radius cutting force and fatigue life by using 3 types of carbide drill blanks with 0.1mm diameter in high speed rotating.