Cutting insert

Abstract

In a cutting insert, a cutting edge is formed on a peripheral border of a rake face; a protruding section is formed on the rake face; a pair of convex sections is formed so as to extend toward the cutting edge; the convex sections face toward a corner portion; the convex sections include first wall surfaces and second wall surfaces; the first wall surfaces and the second wall surfaces are inclined surfaces that are inclined toward the rake face as those are farther from ridgelines intersecting with each other; and the intersection ridgelines intersect with a wall surface of the protruding section, at a position lower than a top portion of the protruding section in the corner portion side.

Description

[0001]Priority is claimed on Japanese Patent Application No. 2007-056975, filed Mar. 7, 2007, the contents of which are incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a cutting insert mounted on a replaceable insert turning tool and capable of reliably disposing of cutting chips produced under various cutting conditions from a medium cutting for cutting relatively a large amount to a light cutting such as a finish cutting for cutting a small amount.[0004]2. Description of the Related Art[0005]Such a cutting insert capable of reliably disposing of cutting chips produced under various cutting conditions from the medium cutting to the finish cutting is discussed in, for example, Japanese Unexamined Patent Application, First Publication No. 2006-272548. In the cutting insert, a breaker groove is formed along a cutting edge on a rake face. A protrusion of a boss surface extends to a corner portion of the c...

AI Technical Summary

Benefits of technology

[0010]According to the cutting insert, the cutting chips are produced in the corner portion of the cutting edge at the time of a finish cutting for cutting small amount. In this case, the cutting chips scrape the rake face and flow out through the gaps between the first wall surfaces of the pair of convex sections. Then, the cutting chips are guided by the first wall surfaces, and the cutting chips are curled by colliding against the wall surface of the protruding section. Thus, the cutting chips are disposed of. Here, in the convex section, the intersection ridgelines of the first wall surfaces and the second wall surfaces intersect with the wall surface of the protruding section at a position lower than the top portion of the corner portion side in the protruding section. That is, the protrusion height of the top portion in the protruding section is set higher than the intersection points between the intersection ridgelines and the wall surface of the protruding section. Thus, it is possible to prevent the cutting chip produced at the time of the finish cutting from overflowing out of the protruding section.

[0026]According to the present invention as described above, it is possible to reliably dispose of cutting chips in the finish cutting for cutting small amount. In addition, it is also possible to provide a cutting insert, which has long durability, capable of stably disposing of cutting chips during a long term by suppressing abrasion of the convex section even in the medium cutting for cutting relatively large amount.

Problems solved by technology

Thus, it is difficult to form the aforementioned standing angle since a gradient of the standing face is steep based on a protrusion height of the top portion of the protrusion and a distance from the top portion to the cutting edge.

Accordingly, in the medium cutting for cutting relatively large amount, the standing face is prematurely abraded by contacting with cutting chips, and there is concern that durability of the insert is deteriorated.

As a result, it is difficult to smoothly dispose of the cutting chips.

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