| 摘要 |
A cutting insert with a substantially triangular or square basic form is particularly suited for face milling at high feed rates. It has convex cutting edges, which are each made up of a circular arc and at least one straight portion. Each cutting edge has, adjoining a cutting corner, a straight face cutting edge that merges with a main cutting edge, having 1 to 3 straight portions, a circular portion with a radius of at most 80% of the radius Ri of the inscribed circle. The cutting edges have an all-round cutting edge chamfer with a chamfer angle α. This chamfer angle α has along the cutting corners a value in the range from −10° to −20° and changes continuously along sub-portions of the face cutting edge and main cutting edge and along the circular portion to a constant value in the range from 0° to −10°. |
| 主权项 |
1. A cutting insert, comprising:
a cutting insert body having a top surface, a base surface, and lateral flanks connecting said top surface and said base surface to one another; cutting edges, said cutting edges being convex in a plan view and being formed by an intersection between said top surface and said lateral flanks and/or by an intersection between said base surface and said lateral flanks; said cutting edges extending between respective cutting corners each having a corner radius Re; each said cutting edge, starting adjacent a cutting corner, having a straight wiper edge, followed by a circular section, and merging into a main cutting edge having at least one straight section; a cutting edge chamfer extending around an entire said cutting insert body and having a chamfer angle α with a substantially constant first value in a region around said cutting corners, said first value being within a range of −10° to −20° ; said chamfer angle α changing continuously from said first value to a second value in regions adjacent said cutting corner on both side along a segment of said wiper edge or of said main cutting edge, respectively; said second value being substantially constant along the remaining sections of said wiper edge and said main cutting edge and along said circular section, said second value lying within of 0° to −10 °. |
