1994 年 60 巻 2 号 p. 240-244
The present study investigates the influence of three-dimensional tool geometry upon the cutting mechanism of a 18%Mn-5%Cr steel with a P 20 carbide tool, where the computer simulation method proposed in the previous paper has been employed. The three-dimensional simulation has revealed that the physical background of empirical knowledge such that a larger corner radius is recommended for difficult-to-cut materials for large work-hardening and low thermal conductivity; the increase of the radius causes a large chip-flow angle and small undeformed and deformed chip thicknesses at the corner, leading to the decrease in the deformation and the drop of temperature. As a result, not only wear at the corner but also the influence into the finished surface is lessened. Experiments have validated the simulation results: both predicted and measured cutting forces, chip geometry, tool temperature and tool wear accord well with each other.