Patent ID: 9403222
Filing Date: 2016-08-02
CPC Classification: B23C,Y10T

Claim Text:
1. A method of removing an end-surface burr of a formed groove cut into a workpiece, comprising: cutting the formed groove by rotationally driving around an axial center and moving a formed rotary cutting tool relative to the workpiece in a direction orthogonal to the axial center, and rotationally driving around an axial center and moving a formed rotary cutting tool for chamfering relative to an end surface of the formed groove in a direction perpendicular to the axial center along an axial center movement locus forming the chamfer angle relative to an axial center movement locus of the formed rotary cutting tool in the cutting of the formed groove, thereby performing chamfering for removing a burr on the end surface, wherein the formed rotary cutting tool for chamfering is acquired by deforming a radial shape of the formed rotary cutting tool used in cutting of the formed groove in accordance with a predefined chamfer angle, and wherein a radial shape f(x) corresponding to an axial position x of the formed rotary cutting tool for chamfering is expressed by wherein f if a portion to be chamfered is located on an acute angle side, g(α,θ)=1+tan α×tanθ is satisfied, and wherein if a portion to be chamfered is located on an obtuse angle side, g(α,θ)=1·tan α×tanθ is satisfied.