CUTTING INSERT, BLADE EDGE REPLACEABLE ROTARY CUTTING TOOL, AND ROTARY CUTTING PROCESSING METHOD

To provide a cutting insert that can prevent a material to be cut from warping, a blade edge replaceable rotary cutting tool, and a rotary cutting processing method.SOLUTION: The cutting insert comprises a front surface 11, a rear surface 12, an outer peripheral surface 13, and a cutting blade 14 formed at a ridge-line between the front surface 11 and the outer peripheral surface 13. The rear surface 12 has a planar shape perpendicular to an insert center axis C, and the outer peripheral surface 13 has a flank face 20. The flank face 20 obliquely extends toward inside in a radial direction of the insert as going from the front surface 11 toward the rear surface 12 in a direction of an insert axis. The front surface 11 has a rake face 15, and the rake face 15 obliquely extends from the rear surface 12 toward the front surface 11 in the direction of the insert axis as going from the cutting blade 14 toward inside in the radial direction of the insert.SELECTED DRAWING: Figure 8 【課題】被削材に反りが生じることを抑制できる切削インサート、刃先交換式転削工具および転削加工方法を提供する。【解決手段】表面１１と、裏面１２と、外周面１３と、表面１１と外周面１３との交差稜線に形成される切れ刃１４とを備え、裏面１２は、インサート中心軸Ｃに垂直な平面状であり、外周面１３は逃げ面２０を有し、逃げ面２０は、インサート軸方向の表面１１から裏面１２側へ向かうに従い、インサート径方向の内側へ向けて傾斜して延び、表面１１はすくい面１５を有し、すくい面１５は、切れ刃１４からインサート径方向の内側へ向かうに従い、インサート軸方向の裏面１２から表面１１側へ向けて傾斜して延びる。【選択図】図８