| 摘要 |
PROBLEM TO BE SOLVED: To provide a cutting insert capable of providing high finishing surface accuracy, while lengthening the tool service life by restraining generation of a burr, in machining work of a difficult-to-cut material such as stainless steel. SOLUTION: A corner blade 7 forming a projecting circular arc shape in a plan view opposed to a rake surface 2, is formed in a corner part C of the rake surface 2 of an insert body 1. This corner blade 7 is formed as an inclined cutting edge 8 inclined so as to gradually retreat in the opposed direction to the rake surface 2 toward both end part S sides from a projecting end part R of a projecting circular arc formed by the coiner blade 7 in a plan view. Both end parts S of this corner blade 7 are formed with an inversely inclined cutting edge 9 extending in the tangent direction of the projecting circular arc in both end parts S in the plan view and inclined so as to gradually protrude in the opposed direction to the rake surface 2 toward the separating direction to the corner blade 7 from an end part of the inclined cutting edge 8. COPYRIGHT: (C)2011,JPO&INPIT
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