Rotary cutting body having insert pocket with seat surface provided with a plurality of abutment elements and rotary cutting tool

A rotary cutting tool (52) comprising:

• a rotary cutting body (20) having a tool axis (AT) about which the cutting body is rotatable in a direction of rotation (R), and at least one insert receiving pocket (22) provided at an axial forward end (24) of the cutting body (20), the insert receiving pocket (22) having:
• a seat surface (26) facing in the direction of rotation (R) and including a threaded bore (38) having a bore axis (Al),
• a radially outward facing pocket wall (28) transverse to the seat surface (26), the pocket wall (28) having a wall edge (48) spaced apart from the seat surface (26),
• a first plane (P1) which is tangential to the wall edge (48), perpendicular to the seat surface (26) and intersects the axial forward end (24) of the cutting body (20), and
• a plurality of male and/or female abutment elements (30;
• 32a, 32b) associated with the seat surface (26) and including:
• an axial abutment element (30) having an axially forward facing abutment surface (40), the axially forward facing abutment surface (40) having an axial abutment edge (46), and
• at least one radial abutment element (32a, 32b) having a radially inward facing abutment surface (42a, 42b),
• wherein in a top view of the insert receiving pocket (22), the axial abutment edge (46) forms an external acute clamping angle (a) with the first plane (P1);
• and
• at least one cutting insert (54) removably secured in the at least one insert receiving pocket (22), the cutting insert (54) comprising:
• opposing upper and lower surfaces (56, 58) with a peripheral side surface (60) extending therebetween, and a through bore (62) intersecting the upper and lower surfaces (56, 58) having an insert axis (A2),
• at least one cutting edge (64a, 64b) formed at the intersection of the upper surface (56) and the peripheral side surface (60), and
• the lower surface (58) having a base surface (66) and a plurality of male and/or female abutting elements (68a, 68b;
• 70a, 70b) associated with the base surface (66), the plurality of abutting elements (68a, 68b;
• 70a, 70b) including at least one axial abutting element (68a, 68b) and at least one radial abutting element (70a, 70b), and
• a clamping screw (72) passing through the through bore (62) and threadingly engaging the threaded bore (38),
• wherein:
• the insert's base surface (66) is in contact with the seat surface (26);
• the at least one radial abutment element (32a, 32b) occupies or is occupied by the at least one radial abutting element (70a, 70b);
• and
• the axially forward facing abutment surface (40) is in contact with a corresponding axial abutting surface (74a, 74b) of one of the at least one axial abutting element (68a, 68b).

A single-sided milling insert (54), comprising:

• opposing upper and lower surfaces (56, 58) with a peripheral side surface (60) extending therebetween, the lower surface 58) having a base surface (66);
• the peripheral side surface (60) comprises a pair of opposite end surfaces (75) connected to one another by a pair of opposite side surfaces (77);
• two spaced apart cutting edges (64a, 64b) formed at the intersection of the upper surface (56) and the peripheral side surface (60), and a through bore (62) intersecting the upper and lower surfaces (56, 58) and having an insert axis (A2) about which the cutting insert is indexable,
• a plurality of female abutting elements (68a, 68b;
• 70a, 70b) associated with the base surface (66), and including two spaced apart axial abutting elements (68a, 68b) and two spaced apart radial abutting elements (70a, 70b),
• wherein the insert's lower surface (58) comprises:
• a single longitudinal groove (71) recessed into the base surface (66), opening out to the opposite end surfaces (75), passing through the through bore (62), and including both of the spaced apart radial abutting elements (70a, 70b);
• a pair of parallel transverse grooves (69a, 69b) recessed into the base surface (66), each transverse groove (69a, 69b) opening out to the opposite side surfaces (77), avoiding the through bore (62), and comprising a respective one of the radial abutting elements (68a, 68b);
• wherein the single longitudinal groove (71) intersects each of the transverse grooves (69a, 69b) and forms an acute groove angle (γ) therewith, the acute groove angle (γ) being at least 45 degrees and at most 75 degrees.