POLYGONAL CUTTING BLADE HAVING CIRCULAR ARC-SHAPED GROOVE IN HOLE AND CUTTING TOOL

摘要

A polygonal cutting blade having a circular arc-shaped groove in a hole and a cutting tool. The polygonal cutting blade includes a blade body (1) composed of an upper surface (2), a lower surface (3) and a plurality of main side surfaces (41) connecting the upper surface (2) and the lower surface (3). The blade body (1) is provided with a central hole (5) penetrating through the upper surface (2) and the lower surface (3), and the blade body (1) is centrally symmetrical about a central axis (6) of the central hole (5). The main side surfaces (41) intersect the upper surface (2) to form a main cutting edge (7). In the plurality of main side surfaces (41), at least one set of positioning side surface comprised of adjacent two of the main side surfaces (41) is provided. An inner surface of the central hole (5) has at least one circular arc-shaped groove (51) fitting with a surface of a fastening screw (11) for fixing the cutting blade. A number of the circular arc-shaped groove (51) corresponds to a number of the set of positioning side surface. Each circular arc-shaped groove (51) directly faces toward an intersection of the two main side surfaces (41) of the set of positioning side surface. A groove central axis (515) of the circular arc-shaped groove (51) has an offset distance from the central axis (6). The cutting tool includes the above cutting blade. The present invention has the advantage of stable positioning and long service life of the tool.