Abstract
A cutting model taking account of the variation of working normal rake angle, cutting velocity and others along the chisel edge is developed for the case that the chisel edge portion is thinned to be a uniform tool-chip contact length. It is assumed that the deformation in a plane containing the cutting and the chip flow velocities takes place as in two-dimensional plastic flow. The mode of deformation consists of three straight lines of velocity discontinuity. The model including seven variables with respect to the geometry of deformation zone and velocities represents that the whole chip produced by the chisel edge is to be a helical one, although the cutting and the chip flow velocities vary in magnitude and direction at each point on the chisel edge. Applying the energy method to the model equations are derived for the prediction of chip formation, torque and thrust.
