| 摘要 |
PURPOSE:To decrease a cutting burden per one full rotation and to increase a life, by a method wherein a cutting section is divided radially in addition to a radial direction in a way that the waveform cutting baldes of a blade part situated along a groove are orderly displaced in a phase by a length shown by a specified formula at each blade part. CONSTITUTION:Cutting blades in a waveform with a pitch P' at each blade part at an end mill, being, for example, 6 (I VI) in the number of blade parts, are positioned in a manner that phases are displaced, in order, by (P'/6X2). In the size, in a radial direction on a line D-D' of cross section extending at right angles with an axis, of a waveform cutting blade 5 based on an apex T of a blade part I, the sizes of the blade parts I and IV are equal to an outer size virtual line L, that of a blade part II is minus (a), and that of a blade part III is minus (b). Thus, since two or more cutting blades, having the same size and same shape to each other, appear on a cross section extending at right angles with an axis in the arbitrary position of the blade part, a cutting cross section is divided radially in addition to an axial direction, a cutting quantity per one cutting blade is reduced to 1/2 that of a conventional type, wear of a cutting blade is also reduced, and a life can be sharply increased. |
