FIELD: milling.
SUBSTANCE: in rotating cutting tool (52) used for milling operations, double-sided cutting plate (20) is detachably fixed in cutting housing (54). Cutting plate (20) comprises two opposite end surfaces (22) connected by continuous peripheral surface (24), which includes three side surfaces (26) alternating with three angular surfaces (28). Lateral and angular surfaces (26, 28) intersect both end surfaces (22) in side and corner edges (32, 34), respectively, wherein each side edge (32) comprises a main cutting edge (36), and each angular edge (34) comprises an angular and an auxiliary cutting edge (38, 40). Each auxiliary cutting edge (40) has projected auxiliary cutting length (LM) on the end face view, and each corresponding auxiliary rear surface (48) has an auxiliary rear width (W) between two lateral boundary points contained in the horizontal plane (PH), varying depending on the displacement distance (Do) between the horizontal plane (PH) and middle plane (M). Each projecting auxiliary cutting length (LM) is greater than maximum auxiliary rear width (WMAX) of auxiliary rear surface (480) corresponding to it.
EFFECT: higher strength of cutting edges and reduced roughness of machined surface.
20 cl, 11 dwg
