Analysis of the cooling lubricant flow in the area of cutting edges and guide pads during ejector deep hole drilling

Abstract

Ejector deep hole drilling makes the advantages of deep hole drilling usable for the industry on conventional machining centers. The ejector effect, which is based on the Venturi principle, is mainly responsible for a stable execution of the drilling process by supplying the working zone with a cooling lubricant. To achieve an enhanced understanding of the cooling lubricant flows at the ejector drill head in the areas of the cutting inserts and guide pads, an Smoothed Particle Hydrodynamics based simulation model, which allows to simulate the challenging effects and conditions of the process, was developed and validated with experimental test series.