超硬合金エンドミルの折損の解析的予測

Abstract

This paper describes the prediction method of the fracture area and fracture probability in failure of a cemented carbide endmill under side cutting operation. The law of deterioration, which was confirmed by a theoretical and experimental examination in a single point tool made of cemented carbide, is applied to an endmill with more compricated shape. The cutting tests are achieved for measuring cutting forces in three directions and a tool failure distribution in the number of cutting load experimentally. The theoretical fracture distribution is predicted using FEM computer simulation, which is formulated using the law of deterioration and cutting forces measured, and the effect of a tool shape and cutting conditions on fracture distribution is shown, compared with the experimental results. Theoretically and experimentally, failure originates at the cutter sweep and the fixed end independently of cutting condition, both fracture probabilities are agree approximately. Only by modifying of applied cutting load, which is measured experimentally, the calculation result agrees with the fracture probability in the number of cutting load, in different kinds of cemented carbide tool materials.