Gear milling cutter as well as a replaceable milling insert therefor

A gear milling cutter comprising:

• a basic body being rotatable around a center axis and having a rotationally symmetrical basic shape, which includes two opposite flank sides that extend radially inward from a periphery of the basic body;
• and
• a plurality of replaceable milling inserts, which are mounted on the flank sides,
• wherein the plurality of milling inserts individually comprise a cutting edge formed where one chip surface and one clearance surface meet and extends between a pair of opposite and radially separated ends of the milling insert,
• wherein some of the plurality of milling inserts are root inserts, which are placed in tangentially spaced-apart positions along the periphery of the basic body,
• wherein others of the plurality of milling inserts are flank inserts, which are tangentially spaced-apart and placed in at least one ring formation located radially inside the root inserts,
• wherein sweep areas of radially separated milling inserts overlap each other in a ring-shaped overlapping zone by radially inner ends of at least the root inserts being situated nearer the center axis of the basic body than radially outer ends of the flank insert next inside,
• wherein, in side view, the cutting edge of each milling insert includes a straight main edge, and a first part edge that is located between the straight main edge and one of the ends of the milling insert and is shorter than the main edge, the first part edge deviating from a straight reference line in the extension of the main edge in a direction of an end of the milling insert at a deviation angle (α) of at most 10°, and
• wherein the cutting edges of the root inserts radially overlap the cutting edges of the next inside flank inserts in a point of intersection situated between end points of the first part edges.