CUTTING METHOD BY ROTARY TOOL

摘要

A cutting method capable of cutting with a high accuracy in short working time to form a recessed part (W) at least partly formed of a curved surface in a material, comprising the steps of sorting the numerical data on the formed recessed part into the numerical data on a plurality of recessed part sections formed by dividing the recessed part by contour lines, cutting contour grooves by using a first rotary tool, cutting the areas surrounded by the contour grooves cut in the previous step by using a second rotary tool larger in diameter than the first rotary tool, cutting the contour grooves in the bottom surfaces of the recessed portions formed in the previous step by using the first rotary tool, cutting the areas surrounded by the contour grooves cut in the previous step by using the second rotary tool, and repeating these steps until the recessed part is formed in the material.