ENDMILL, AND MACHINING METHOD USING THE SAME

PROBLEM TO BE SOLVED: To provide an endmill which can accurately and efficiently machine a three-dimensional recessed curved surface to be used in a jet engine, etc., and further to provide a machining method using the same endmill. SOLUTION: A circular arc cutting edge 11 of a cutting edge portion formed on the tip end portion of a shank 13 is formed so as to have a shape to be inscribed to an imaginary body 15 of revolution formed by turning a circular arc 14 about a rotary axis 12. The center of the circular arc is positioned on the shank side so as to separate from the rear end 16 of the circular arc cutting edge by a specified distance. By this configuration, the tilting angle of the rotary axis with respect to the common tangent of the circular arc cutting edge of the endmill 10 and the surface to be machined can be set to be large. Therefore, the shank does not interfere with the edge portion of the recessed curved surface to be machined when, for example, a central flat surface portion of the recessed curved surface to be machined, such as a blade of the jet engine, is being machined by means of the circular arc cutting edge. COPYRIGHT: (C)2007,JPO&INPIT