Abstract: A double ended metal-cutting insert includes a pair of circular cutting edges disposed at respective end surfaces of the insert. Each end surface includes an upper portion connected to the cutting edge, and a lower portion connected to the upper portion by a concave transition portion. The lower portion is recessed relative to the upper portion in a direction toward the opposite cutting edge. The lower portion is a flat face oriented perpendicular to the bottom surface.

Abstract: A parting tool includes a thin holder forming a groove open at one end, and a double-ended cutting insert mounted in the groove. The insert includes front and rear cutting edges and a rear end surface abutting against a rear support surface of the groove. The rear support surface is configured to enable differently shaped double-ended inserts to be mounted therein without the occurrence of contact between the rear cutting edge and a surface of the holder.

Abstract: A cutting insert for grooving operations includes a central shank portion and a forward cutting head. The cutting head includes a front clearance surface having a main cutting edge at an upper end thereof. The clearance surface is non-planar. Rather, the clearance surface exhibits a curvature in order to strengthen the main cutting edge.

Abstract: The present invention relates to an indexable cutting insert (10) for the turning of grooves with triangular basic shapes where each insert comer features a projection (16). Each projection supports a transverse cutting edge (17) and connecting diverging cutting edges (18, 19), so that the projection (16) seen in a view directly from above has a symmetrical shape. The one outer side edge (18) of the projection (16) is bordered by an unbroken flat flank surface (22) whilst the connecting flank surface on the other side edge (19) is comprised of two partial surfaces (27, 28) of which the one nearest the edge (19) partial surface (27) has a smaller clearance angle than the partial surface (28) nearest the bottom.

Abstract: A cutting insert for grooving operations includes a shank portion and a forward cutting head. The shank portion includes an upper surface, a bottom surface and side surfaces, wherein a line of intersection between the upper side and a forward clearance face forms a main cutting edge. Between the main cutting edge and a secondary cutting edge there is provided a corner cutting edge. The corner cutting edge comprises a primary curved edge with a first radius extending from the main cutting edge, and a secondary curved edge with a second radius, larger than the first radius, that extends from the primary edge to a side edge and oriented perpendicular to the main cutting edge. The cutting insert also comprises an upper side confined by two longitudinal ridges and an elongated chip forming recess therebetween.