Drilling tool and an indexing cutting insert for use therein

An indexable cutting insert for use in a drilling tool, comprising:

• a rake face, relief flank faces, a base, a plurality of cutting edges, each defined between the rake face and adjacent relief flank face and included between two adjacent cutting corners, each of said cutting edges comprising at least one set of component cutting edges, each set comprising two pairs of component cutting edges, each pair comprising a first and a second component cutting edge, the first component cutting edges of both pairs merging in a common point, said component cutting edges being oriented so that an extremity of the second component cutting edge innermost with respect to said common point is closer to a center of the insert than an extremity of the first component cutting edge outermost with respect to said common point, said extremities merging via a bridging section which is directed from said outermost extremity of the first component cutting edge towards
• a central line constituting or parallel to a median line of the insert and passing through said common point so that said innermost extremity of said second component cutting edge is closer to said central line than said outermost extremity of said first component cutting edge ensuring overlapping of said extremities during a drilling action.

A cutting insert for use in a drilling tool comprising:

• a rake face, relief flank faces, a base, a plurality of cutting edges, each defined between the rake face and adjacent relief flank face and included between two adjacent cutting corners;
• at least one of said cutting edges comprising at least one set of component cutting edges, each set comprising two pairs of component cutting edges which pairs are arranged at two sides of a central line passing through a common point of merger of the two pairs and constituting or parallel to a median line of the insert;
• each pair comprising a first and a second component cutting edge merging through a bridging section directed substantially towards said central line of the insert, said component cutting edges being oriented with respect to said central line so that a radially innermost extremity of the second component cutting edge is closer to the center of the insert and to said central line than a radially outermost extremity of said first component cutting edge.