| 摘要 |
In a cutting insert according to an embodiment, an upper cutting edge includes, sequentially from a first corner to a second corner, a corner cutting edge, a minor cutting edge inclined as separating from the corner cutting edge at a first inclination angle on a basis of a vertical plane perpendicular to a central axis extending between upper and lower surfaces, and a major cutting edge inclined as separating from the minor cutting edge at a second inclination angle on the basis of the vertical plane so as to become more closer to the lower surface than the minor cutting edge. A cross section of a rake surface obtained by cutting an inwardly located end portion thereof along a direction of the central axis has a straight line shape or concave shape in a region crossing over at least a minor rake surface and a major rake surface. |
| 主权项 |
1. A cutting insert, comprising:
a polygonal shaped upper surface; a lower surface being identical in shape to the upper surface; a side surface connected to each of the upper surface and the lower surface; and an upper cutting edge located at an intersection of the upper surface and the side surface, wherein the upper surface comprises first and second corners adjacent to each other, a rake surface continuous with the upper cutting edge, and a connection surface located more inward than the rake surface and inclined toward the lower surface, an inclined angle of the connection surface is larger than an inclined angle of the rake surface, the upper cutting edge comprises, sequentially from the first corner to the second corner, a corner cutting edge, a minor cutting edge inclined as separating from the corner cutting edge at a first inclination angle on a basis of a vertical plane perpendicular to a central axis extending between the upper and lower surfaces so as to approach the lower surface, and a major cutting edge inclined as separating from the minor cutting edge at a second inclination angle on the basis of the vertical plane so as to approach the lower surface, the rake surface comprises a minor rake surface being continuous with the minor cutting edge and inclined as going inward at a first rake angle on the basis of the vertical plane so as to approach the lower surface, and a major rake surface being continuous with the major cutting edge and inclined as going inward at a second rake angle on the basis of the vertical plane so as to approach the lower surface, and a cross section of the rake surface obtained by cutting an inwardly located end portion thereof along a direction of the central axis has a straight line shape or concave shape in a region crossing over at least the minor rake surface and the major rake surface. |
