Cutting inset and detachable cutting tool for cutting insert

Abstract

The cutting insert is provided with a polygonal-shaped insert main body (2) having two polygonal surfaces (3, 3) spaced away from each other and a plurality of side surfaces formed between these polygonal surfaces and also provided with cutting edges (8A, 8B, 8C) formed as a rake face on a peripheral edge of a first side surface (4) among the plurality of side surfaces. Among the plurality of side surfaces, a second side surface (6) which is positioned on the opposite side of the first side surface and given as a seating surface in contact with an insert seat of the tool main body for attaching the cutting insert is formed in a V-shape when viewed from the thickness direction of the insert main body and includes two contact portions (6A, 6A), each of which is formed in a raised curve shape on a cross section along the thickness direction, and the two contact portions are formed in a recessed V-shape so as to be greater in depth moving toward the center of the second side surface on the cross section along the thickness direction.

Description

technical field [0001] The present invention relates to a cutting insert and a detachable-insert cutting tool to which the cutting insert is mounted. The cutting insert is detachably attached to the detachable-insert cutting tool used especially in milling. [0002] This application claims priority to Japanese Patent Application No. 2009-53611 filed on March 6, 2009 and Japanese Patent Application No. 2010-37222 filed on February 23, 2010, and the contents thereof are cited here. Background technique [0003] As a cutting insert attached to such a detachable insert cutting tool for milling and a detachable insert cutting tool to which the cutting insert is attached, for example, the cutting insert and the insert detachable insert described in Patent Document 1 are known. Removable cutting tools. In the cutting insert and the insert-removable cutting tool described in Patent Document 1, chip discharge grooves are formed on the outer periphery of a cylindrical tool body that ...

AI Technical Summary

Problems solved by technology

In this case, it is difficult to improve the machining efficiency because the cutting edges provided on the cutting inserts arranged in the plurality of chip discharge grooves form a row of cutting edges with continuous rotation trajectories.

This is particularly a problem in the case of, for example, the above-mentioned long-blade type milling insert detachable cutting tool in which the above-mentioned cutting edge array has a long blade length in the axial direction.

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