Cutting Mechanism and Load Characteristic of Trapezoidal Center Bevel Cutter Indented on Aluminum Sheet

Abstract

This paper reports about the fundamental relationship between tip thickness of crushed cutter and thickness of wedged sheet. By varying the tip thickness of a trapezoidal center bevel cutter, the resistance of cutter indentation and the shared profile of aluminum sheet were investigated experimentally. To discuss the deformation mechanism of aluminum sheet in the necking stage, Hill's solution with slip line theory and finite element analysis with elasto-plastic model were applied to this wedge indentation. The derived results were as follows: the necked height of sheet material varies with the tip thickness of cutter; the occurrence limit of necking deformation exists in terms of sheet thickness; the line force at the deflection point varies with the tip thickness of the cutter, but not with sheet thickness; the residual sheet thickness beneath the cutter tip depends on the thickness of cutter tip.