Milling tool for gear milling

A milling tool formed for the hobbing of a workpiece having cogs, the milling tool comprising:

• a tool body that defines a rotation axis (C1) and has a fixing end, an opposite outer end, and a peripheral surface that extends around the rotation axis (C1) between the fixing end and the outer end, the tool body comprising a large number of separated seats that are arranged at the peripheral surface one after the other along a helix line (x) having a constant pitch;
• and
• a corresponding plurality of replaceable milling inserts mounted in the seats of the tool body, each insert including an under side, an opposite upper side that forms a chip surface, a circumferential edge side that connects the upper side and the under side, a centre axis (A) that extends through the under side and the upper side, a symmetry line (S) that is perpendicular to the centre axis (A), as well as at least one pair of main cutting edges that are symmetrical in respect of the symmetry line (S) and formed where the edge side meets the chip surface, the chip surface extending in an extension plane (p) that comprises the main cutting edges of said pairs of main cutting edges, and each seat being formed to receive one of said milling inserts and comprising a support surface that is arranged to allow support to the milling insert that projects from the tool body for cutting engagement with a gash of said workpiece (W),
• wherein the chip surface extension plane (p) of each milling insert has a normal that is parallel to the tangent of the helix line (x) where the same intersects the extension plane,
• wherein the chip surface extension plane of each milling insert is inclined relative to the rotation axis (C1),
• wherein, in the chip surface extension plane, the symmetry line is aligned with and contains a radius of the outer end,
• wherein the milling inserts are arranged in a plurality of rows,
• wherein each row comprises at least two milling inserts and extends along a respective line (L) that is perpendicular to the tangent of the helix line (x), and
• wherein the chip surface extension planes (p) of adjacent pairs of milling inserts of the same row form an angle with each other.