Cutting insert and milling tool

Abstract

A compact cutting insert that can make tool bodies in common and a milling tool using the cutting insert are provided. The cutting insert (10) has an upper surface (20) and a lower surface (40) on a side opposite to the upper surface (20), and a peripheral side surface (30) that connects the upper surface (20) and the lower surface (40). An edge (11) where the upper surface (20) and the peripheral side surface (30) intersect includes at least one cutting edge (14). The peripheral side surface (30) includes a flank (31) adjacent to the at least one cutting edge (14), a thickness-reduced surface (33) adjacent to the flank (31) from the lower surface (40) side, and a contact surface (32) adjacent to the thickness-reduced surface (33) from the lower surface side. In a section cut out on a plane including a central axis (O), an angle (β) formed by a virtual plane (V) parallel to the central axis (O) passing through a center of the upper surface (20) and a center of the lower surface (40) and passing through the at least one cutting edge (14) and the contact surface (32) is larger than an angle (γ) formed by the virtual plane (V) and the thickness reduced surface (33).

Dependencies are inferred from the claim text.