Process integrity of deep hole drilling for small diameters

Abstract

Process-integrity in deep-hole drilling with solid-tungsten-carbide-drills of 1 and 2 millimeter diameter requires chipremoval in the bead by the internal cutting-fluid supply. The flow rate of the cutting fluid depends on the internal profile and the length of the drill-shaft· The cross-sectional area of the shaft also determines its stiffness and breaking strength. Tool wear increases the cutting forces and thereby also the stressing of the drill. Optimisation of the progress-integrity can be achieved by careful selection of the cutting-parameters.