Cutting insert with improved chip control

A cutting insert for removing metal from a workpiece while forming a cutting chip, the cutting insert comprising:

• an insert body having a left-side wall, a right-side wall, a top surface defining a notch therein, a bottom surface, and an end region defining a front cutting edge and a chip control pocket;
• a land region extending inward from the front cuffing edge, the land region having a positive rake angle and including a front land portion adjoining the front cutting edge;
• the chip control pocket having a front descending wall, a left-side descending wall, and a right-side descending wall;
• and
• a protuberance spaced between the left-side descending wall and the right-side descending wall of the chip control pocket for forming a crease along a length of the cutting chip formed by the front cutting edge, the protuberance having an elongate top surface defining a raised portion spaced vertically between the front cutting edge and a base perimeter of the protuberance and defining a protuberance axis generally perpendicular the front cutting edge, the protuberance having a protuberance base perimeter intersecting the front descending wall, and a protuberance left-side surface and a protuberance right-side surface each sloping downward from the raised portion toward the protuberance base perimeter, each protuberance left-side and right-side surface being a curvilinear surface within both a vertical plane perpendicular to the front cutting edge and a vertical plane parallel to the front cutting edge.

An invertible cutting insert for removing metal from a workpiece while forming a cutting chip, the cutting insert comprising:

• an insert body having a left-side wall, a right-side wall, a top surface defining a top notch therein, a bottom surface defining a bottom notch therein, and a first end region and an opposing second end region each defining a front cutting edge, the top surface and bottom surface of the insert body each being generally perpendicular to the right-side wall of the insert body;
• a land region extending inward from a respective front cutting edge toward a respective notch, the land region having a positive rake angle and including a front land portion adjoining the front cutting edge, a left-side land portion adjoining an end region left-side wall, and a right-side land portion adjoining an end region right-side wall, the front land portion, the left-side land portion, and right-side land portion defining a periphery of a chip control pocket in the end region;
• a front descending wall of the chip control pocket extending downward from the front land portion, a left-side descending wall of the chip control pocket extending downward from the left-side land portion to a left-side wall lower end, and a right-side descending wall of the chip control pocket extending downward from the right-side land portion to a right-side wall lower end, the front descending wall and a rear ascending wall of the chip control pocket having a bowl-shaped cross-sectional configuration;
• and
• a protuberance spaced between the left-side descending wall and the right-side descending wall of the chip control pocket for forming a crease along a length of the cutting chip formed by the front cutting edge, the protuberance having an elongate top surface defining a vertically raised portion defining a protuberance axis generally perpendicular to the front cutting edge, the protuberance having a protuberance base perimeter intersecting both the front descending wall and the rear ascending wall, a protuberance left-side surface and a protuberance right-side surface each sloping downward from the raised portion toward the protuberance base perimeter and toward the left-side wall lower end and the right-side wall lower end, respectively, each protuberance left-side and right-side surface being a curvilinear surface within both a vertical plane perpendicular to the front cutting edge and a vertical plane parallel to the front cutting edge.