Cutting insert for a milling tool

摘要

A cutting insert for a gear milling tool comprises an under side, an opposite upper side that forms a chip surface and is parallel to an extension plane (p), a circumferential edge side that connects the upper side and the under side. A centre axis (A) extends through the under side. A symmetry line (S) is perpendicular to the centre axis. A first cutting edge comprises a primary main cutting edge, a secondary main cutting edge—which are symmetrical in respect of the symmetry line—and a transverse end cutting edge between the primary and the secondary main cutting edge. A normal to the extension plane (p) forms an acute clearance angle with the edge side at least along the first cutting edge so that the cutting insert obtains a positive cutting geometry.

主权项

1. A hobbing insert for a milling tool formed for gear milling in the form of hobbing of a workpiece having cogs, the hobbing insert comprising:
an under side; an opposite upper side that forms a chip surface and extends parallel to an extension plane (p); 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 and intersects the centre axis (A); and a first cutting edge comprising a primary main cutting edge and a secondary main cutting edge, which are symmetrical in respect of the symmetry line (S) and formed where the circumferential edge side meets the chip surface, and a transverse end cutting edge that extends between the primary main cutting edge and the secondary main cutting edge and that comprises a straight segment, wherein a normal to the extension plane (p) forms an acute clearance angle (δ) with the circumferential edge side along the primary main cutting edge, secondary main cutting edge and transverse end cutting edge of the first cutting edge so that the hobbing insert obtains a positive cutting geometry, wherein the under side has a recess that extends from the under side and that is arranged to be in engagement with a corresponding projection of a support surface of the milling tool, wherein the recess consists of a single first elongate valley that extends parallel to the symmetry line (S) and transverse to the transverse cutting edge, wherein the first elongate valley includes a bottom surface and two flank surfaces and the flank surfaces form a first obtuse angle with each other, wherein the chip surface comprises a reinforcement bevel that extends inward from only the primary main cutting edges.