Cutting Insert Having Non-Symmetrical Back Side Face Portion and Cutting Tool Comprising the Same

A cutting tool comprising:

• a holder having a pocket formed on a front end portion thereof, the pocket having a pair of jaws;
• and
• a cutting insert indexably mounted to the pocket,
• wherein the cutting insert comprises a upper face and a lower face corresponding to each of jaws, respectively, a front side face portion and a back side face portion corresponding to the pocket of the holder, the front and back side face portions connecting the upper face and the lower face, and a through-hole passing through the upper face and the lower face,
• a cutting edge is formed in the front side face portion,
• the back side face portion is provided with a first inclined face and a second inclined face which are inclined forwardly at different angles, respectively, with respect to a plane normal to a rotational axis, and
• the first inclined face is longer than the second inclined face so that the back side face portion has a non-symmetrical convex “V” shape.

A cutting insert having a rotational axis (L) and comprising:

• an upper face and a lower face;
• a front side face portion and a non-symmetrical back side face portion, the front and back side face portions connecting the upper face and the lower face;
• a through-hole passing through the upper face and the lower face,
• the front side face portion being formed with at least one cutting edge;
• wherein:
• the back side face portion comprises a first inclined face and a second inclined face which converge in a rearward direction of the cutting insert to a point that is spaced apart by a non-zero distance (d) from the rotational axis;
• and
• the first inclined face is longer than the second inclined face.