| 主权项 |
1. A cutting insert, comprising:
a top surface, a bottom surface and a plurality of peripheral side surfaces, the top and bottom surfaces and two of the side surfaces being joined to form a rounded cutting corner; a plurality of cutting edges formed at an intersection between the top surface and the plurality of side surfaces; a rake face sloping inwardly and downwardly from the plurality of cutting edges at a non-zero angle with respect to a plane parallel to the top surface, the rake face extending entirely around the periphery of the cutting insert; an upward sloping back wall extending upwardly from the bottom of the rake face to a central, substantially planar plateau of the top surface; and an asymmetric chip former proximate the rounded cutting corner and extending from the rake face to the central, substantially planar plateau, wherein a first distance between the rounded cutting corner and the asymmetric chip former along a bisector passing through a central axis is greater than a second distance between the rounded cutting corner and the asymmetric chip former proximate one of the plurality of cutting edges extending from one end of the cutting corner, and less than a third distance between the rounded cutting corner and the asymmetric chip former proximate another one of the plurality of cutting edges extending from the other end of the cutting corner such that a ratio of a chip thickness and the first, second and third distances is substantially constant as a function of a depth of cut, wherein a bisector passing through the rounded cutting corner and a central axis of the cutting insert forms a non-zero angle with respect to a bisector passing through the asymmetric chip former, and wherein, with respect to a plane parallel to the top surface, the asymmetric chip former exhibits symmetry about the bisector passing through the asymmetric chip former. |
