Patent ID: 8337123
Filing Date: 2012-12-25
Classification: B23C,Y10T

Abstract:
1. A cutting insert comprising: an insert main body with an upper surface comprising a corner, a lower surface, and a side surface comprising a flank, the insert main body comprising a cutting edge at an intersection of the upper surface and the side surface; wherein the cutting edge comprises a first cutting edge, a second cutting edge, and a third cutting edge, the third cutting edge between the first cutting edge and the second cutting edge being at the corner in top view, wherein the flank comprises a first flank corresponding to the first cutting edge, a second flank corresponding to the second cutting edge, and a third flank corresponding to the third cutting edge, wherein the first flank comprises an upper flank connected to the first cutting edge, a middle flank on the lower surface side of the upper flank, and a lower flank on the lower surface side of the middle flank, and wherein an inequality α<β<γ<ε is satisfied, where α is a clearance angle of the upper flank, β is a clearance angle of the middle flank, γ is a clearance angle of the lower flank, and ε is a clearance angle of the second flank.