Cutting insert for grooving and for the widening of grooves

摘要

A cutting insert for grooving operations comprises a shaft part (2) and a cutting head, the cutting head comprising a top side, a bottom side and relief sides (4, 5, 6) extending between these two sides. The break line of the top side with the front relief side (4) constitutes the main cutting edge and the break lines of the top side with the lateral relief sides (5) constitute side cutting edges (8). The top side has two ridges (15) which extend mainly in the longitudinal direction, a chipbreaker pit (10) between said ridges, which pit comprises two partly overlapping pits (12, 13). A break line (14) or a radius transition extends between the two pits and adjoins at its ends, in connection with two squeezing points or portions (17), the two ridges (15). The chipbreaker pit intersects the main cutting edge (7) so that a curved, depressed cutting edge portion (11) is formed along the main cutting edge. Two burls (18) are located between said break line (14) and main cutting edge (7), either burl adjoining the inner side of the appurtenant ridge (15).;This geometry has resulted in a cutting insert that is perfectly suited for facegrooving, also of the type where not the whole length of the main cutting edge is utilized.