Wegwerfeinsatz

摘要

A throw away insert for low-depth-of-cut finish cutting which can be used for a wide range of feed rate. A breaker groove (5) is provided between the center land (2) and each cutting edge (4). An arcuate small protrusion (3) is formed on the bisector of each nose portion. A narrow groove (6) is formed in the small protrusion. Thin chips, which are produced while the feed rate is low, are curled and broken by the groove formed in the protrusion. Thick chips, which are produced while the feed rate is high, are guided along the grooves and collide with an edge of the center land. Thus, thick chips are also smoothly curled and broken by the edge.