A New Model for Fine Turning Forces

Forces during turning depend not only on material properties and cutting parameters but to a great extent on the edge geometry of the tool as well, which determines chip shape (thickness and width). In fine turning it is almost exclusively the nose radius of the tool that does the cutting. The study reviews the main directions and results of researches in recent years concerning cutting force. It also presents the technology of fine cutting. Due to geometric considerations, chip characteristics are used that allow an exact description of cutting on nose radius as a function of the cutting parameters used. Dynamic tests are performed on two aluminium casting alloys and a mathematical model is constructed specifically for fine turning, using which expected forces can be estimated quite precisely during technological process planning.