| 摘要 |
A double-sided cutting insert 10, for use in a milling cutter, comprising two identical opposing end surfaces 12 and a peripheral side surface extending there between, the peripheral side surface comprising two opposing identical major side surfaces 18, four spaced apart major cutting edges 34, each major cutting edge 34 formed at the intersection of each major side surface 18 with each end surface 12, and a primary relief surface 50 adjacent each major cutting edge 34, wherein in each cross section of the cutting insert 10 taken in a plane generally perpendicular to the major side surfaces 18, a line tangent to each primary relief surface 50 extending from the major cutting edge 34 adjacent each primary relief surface 50 is inclined to a median plane of the cutting insert 10 at an acute interior angle, and wherein each end surface 12 comprises a rake surface adjacent each major cutting edge 34, the rake surface extending from the major cutting edges in a generally inward direction of the cutting insert 10 to an inner end surface, wherein each end surface 12 has four corners, two diagonally opposed lowered corners and two diagonally opposed raised corners, the lowered corners being closer to the median place than the raised corners, each end surface 12 comprises two raised corner edges and two lowered corner edges, formed by the intersection of corner side surfaces with each end surface, the raised corner edges being corner cutting edges, the lowered corner edges being corner cutting edges, each major cutting edge 34 extends between a given raised corner edge and given lowered corner edge, and at least one minor cutting edge 36 extending between a given raised corner edge and given lowered corner edge. |
