The operation and performance of a groove-type chip forming device

Abstract

When cutting with double rake angle tools it is known that the configuration of the dead metal zone that may form, influences the surface roughness and sub-surface deformation of the workpiece. The effect of changes in cutting conditions on the configuration of this dead metal zone is reported. A mechanism of chip breaking when using a groove-type chip former is proposed and the relationship between the relevant tool parameters and the radius of the formed chip is established. Experimental work concerning the performance of groove-type chip forming devices, with respect to tool life and the surface integrity of the machined surface, indicates how the tool land dimensions may be determined. Also, consideration of the break mechanism shows how the groove dimensions and the operating feed range may be obtained for a given value of minimum chip breaking feed.