Patent ID: 7052386

Claim:
A curved surface cutting method in which a surface of a material is cut by a bite to form a specified curved surface, the curved surface cutting method comprising: providing a cutting edge of the bite with a flat section and corner sections at both ends of the flat section; determining a posture of the cutting edge of the bite such that a ridge line along the flat section of the cutting edge of the bite is in parallel with a tangential line drawn at the curved surface; cutting the surface of the material with the cutting edge of the bite retained in the posture while feeding the cutting edge in a predetermined feeding direction, thereby forming a first band-like cut surface having a width corresponding to the width of the cutting edge of the bite; and when each time the band-like cut surface is completed, separating the cutting edge of the bite from the surface of the material, moving the cutting edge of the bite in a direction perpendicular to the predetermined feeding direction by a distance shorter than the width of the cutting edge of the bite, and forming another band-like cut surface at a position adjacent to the first band-like cut surface.