Patent ID: 9682427
Date: 2017-06-20
CPC Classifications: B23B,Y10T

Claim:
1. A holder for receiving and fixing a cutting insert, wherein: the holder comprises an insertion hole at a front end part of the holder; said front end part comprises; a first chip control curved surface part that becomes wider from a front end toward a back side when viewed from a side thereof; and a second chip control surface part that extends outwardly from an entire periphery of the first chip control curved surface part and that is outwardly concave when viewed from a side thereof; the first chip control curved surface part comprises i) a curved line that extends from an edge of an opening of the insertion hole toward the back side; or ii) a straight line that extends from the edge of the opening of the insertion hole and connects to a curved line that extends continuously from the straight line toward the back side without an angular part.