Biconcave Cutting Insert Geometry for Narrower Stable Cutting

The cutting insert is divided into multiple cutting edges that can be indexed sequentially. The insert has at least two cutting edges, allowing the user to switch between them as each edge becomes dull, thereby extending the total usage duration without requiring a larger insert body.

The patent transitions from conventional linear arrangements to a three-dimensional configuration where cutting edges are positioned on different surfaces and orientations of the insert body. This spatial arrangement allows multiple cutting edges to be packed into a compact volume, increasing usage duration without proportionally increasing the minimal insert size.

The cutting insert employs curved and rounded geometric features including a rounded rear end, curved cutting edges, and arched support surfaces. These curved geometries distribute mechanical stresses more evenly throughout the compact body, maintaining strength and stability despite the reduced cutting width and shorter dimensions.

The insert features locally optimized geometries such as reinforced corners, varied surface curvatures, and strategically positioned support structures. These local quality variations ensure that critical areas maintain adequate strength and rigidity even though the overall insert size is reduced.

The curved and rounded geometries of the insert, including the arched support surfaces and curved cutting edges, facilitate more efficient heat distribution and transport. The curved paths allow heat to dissipate more effectively through the insert body and into the tool holder, maintaining adequate heat transport capacity despite the reduced size.

The patent utilizes geometric parameter optimization where specific curvature radii, surface angles, and dimensional ratios are carefully selected to maximize heat transport efficiency. The rounded rear end and curved surfaces create favorable thermal pathways that maintain heat transport capacity in the compact insert design.