On Mechanics of Cutting Process with Varying Undeformed Chip Thickness : 1st Report, Some Considerations on Cutting Mechanics

Abstract

A basic discussion on an unsteady cutting process, in which the undeformed chip thickness increases or decreases linearly as in peripheral milling, is carried out. In order to make clear a change of the cutting mechanics with a varying underformed chip thickness, the deformation process of a process of a chip formed in previous cutting stage on the tool rake face must be took into consideration. In this paper, a time dependency of cutting energy is analyzed and theoretical equations are derived on the basis of changes in shearing energy in primary deformation zone and frictional energy consumed in tool-chip interface. Numerical solutions of the equations are calculated and compared with experimental results obtained in peripheral milling. A qualitatively good agreement of the variational configurations in both results shows appropriateness of the theoretical analysis. It is also confirmed that a theoretical discussion can interpret the characteristic variation of cutting mechanics in the milling process.