Effect of cutting parameters on section borders of the empirical specific cutting force model for cutting with micro-sized uncut chip thickness

摘要

Miniaturization is a general trend in part manufacturing: the size of the components and the rate of corresponding tolerance shrink. This fact makes the appliance of precision- and micromachining operations required. Mechanical cutting has been successfully adapted to perform precision machining and microcutting with uncut chip thickness typically under 0.01 mm. Size effect is dominant in this scale: the amount of specific cutting energy greatly increases according the type of material deformation occurring at the cutting edge radius. The multi-sectioned empirical model of specific cutting force proved to be an effective model to indicate such transient mechanisms. Aim of current research is to describe the effect of cutting parameters on the known section borders (called boundary chip thicknesses) in the model of specific cutting force. As a result, the newly created empirical models involve feed rate and cutting speed as direct input parameters, and assumption has been made to explain the physical meaning behind boundary chip thicknesses from the aspect of material deformation.