A force model for nose radius worn tools with a chamfered main cutting edge

摘要

The three-dimensional cutting forces for nose radius tools with a chamfered main cutting edgeincorporated with a tool-worn factor are presented in this paper. The variations in shear plane areasoccurring in the tool-worn situation are used. The results obtained from the proposed model showsgood agreement with the experimental data on both chip formation as well as cutting forces. In theexperimental work the throwaway tips are locked onto the pocket of the tool holder. The holders forspecial tools are designed first. Next, the tool holders are manufactured by using medium carbon-steel bars and the mounting tips are designed based on various specifications. Finally, the nose radiustips mounting in the tool holder are ground to a wear depth, and the worn tool dimensions aremeasured by using a profile projector. The shear area and the friction area are calculated accordingly.Then the three-dimensional cutting forces will be obtained from those data.