INSERT, TOOL HOLDER AND ASSEMBLY OF THEM

摘要

The technical object of the present invention is to provide an insert to increase strength of a tool holder. To this end, the insert of the present invention includes: an insert body having a first major cutting edge, a first minor cutting edge, a first inclined cutting edge, a second major cutting edge, a second minor cutting edge, and a second inclined cutting edge arranged in the clockwise direction on an upper surface along the circumference thereof; and a holder coupling part formed on the insert body to be coupled to the tool holder. The holder coupling part includes a first and a second coupling hole formed to be penetrated from an upper surface of the insert body to a lower surface of the insert body. The first and second coupling holes are formed to be spaced from each other and sequentially are formed in a direction from the first inclined cutting edge to the second inclined cutting edge. Moreover, a vertical distance between the center of the second coupling hole and the first major cutting edge is set to be larger than the vertical distance between the center of the first coupling hole and the first major cutting edge.