Korloy Inc.

Dong-Bok Park

Sung-Hyun Kim

Sun-Yong Ahn

Seung-Su Ahn

Sung-Gu Lee

Je-Hun Park

Jung-wook Kim

Jae-hoon Kang

Sang-Yong Lee

Wook-Jung Sung

Ki-chan Nam

Sun-Kyoo Lee

Dong-Ryong Ji

Young-Jun Park

Ki-Chan Nam

Jong-Chan Lee

Byung-Sun Choi

Taeg-Won Lee

The objective of the present invention is to provide a cutting insert which reduces cutting load and can be accurately positioned at a coupling part of a cutting tool even if cutting edges are broken or deformed. To this end, the cutting insert of the present invention includes an upper surface, a lower surface, a plurality of lateral surfaces connecting the upper surface with the lower surface, and a plurality of upper cutting edges formed between the plurality of lateral surfaces and the upper surface. In addition, the cutting insert coupled with the coupling part of the cutting tool includes: first and second upper cutting load reducing portions formed on the upper surface and provided at each side coming in contact with first and second upper cutting edges of the plurality of upper cutting edges facing each other so as to reduce the cutting load; and a one side position setting portion provided on a first lateral surface of the plurality of lateral surfaces not coming in contact with the first and second upper cutting edges so as to set the position of the cutting insert in the coupling part.

Cutting insert

The present invention relates to a cutting insert. The cutting insert, according to one embodiment of the present invention, comprises: a top surface; a bottom surface; side surfaces which connect the top surface and the bottom surface to each other; a hole which penetrates the top surface and the bottom surface; and cutting edges which are defined by the top surface and the side surfaces, wherein a main cutting edge side surface among the side surfaces is provided with a first relief surface, a transition surface extending from the first relief surface, and a second relief surface extending from the transition surface, the first relief surface is formed such that the relief angle or the relief surface width varies along the cutting edge, and the transition surface is provided with a plurality of ridges in order to reinforce the rigidity of the cutting edge.

Provided is a hard film for a cutting tool formed on a surface of a base material, the hard film being comprised of a nano multi-layered structure formed by sequentially stacking a thin layer A, a thin layer B, a thin layer C and a thin layer D or being comprised of a structure formed by repeatedly stacking the nano multi-layered structure at least twice, wherein the thin layer A is comprised of TiAlN (0.5&#x2266;x&#x2266;0.7); the thin layer B is comprised of AlTiMeN (0.4&#x2266;y&#x2266;0.7, 0&#x3c;z&#x2266;0.1 where Me is at least one of Si, Cr, and Nb); the thin layer C is comprised of AlTiN (0.5&#x2266;a&#x2266;0.7); and the thin layer D is comprised of AlCrN (0.5&#x2266;b&#x2266;0.7).

Hard film for cutting tool

Provided is a hard film formed on a surface of a base material, the hard film being comprised of a nano multi-layered structure formed by stacking a thin layer A, a thin layer B a thin layer C in order of thin layers A-B-A-C from the base material or being comprised of a structure formed by repeatedly stacking the nano multi-layered structure at least twice, wherein the thin layer A is comprised of TiAlN (0.3&#x2266;x&#x2266;0.7); the thin layer B is comprised of AlCrN (0.3&#x2266;y&#x2266;0.7); and the thin layer C is comprised of MeN (where Me is any one of Nb, V, and Cr).

Provided is a hard film for a cutting tool formed on a surface of a base material, the hard film being comprised of a nano multi-layered structure comprising a thin layer A, a thin layer B, a thin layer C and a thin layer D or a structure in which the nano multi-layered structure is repeatedly stacked at least twice, wherein the thin layer A is comprised of TiAlN (0.5&#x2266;x&#x2266;0.7); the thin layer B is comprised of AlTiCrN (0.3&#x2266;y&#x2266;0.6 and 0&#x3c;z&#x2266;0.3); the thin layer B is comprised of MeN (where Me is Nb or V); and the thin layer D is comprised of AlTiSiN (0.3&#x2266;a&#x2266;0.7 and 0&#x3c;b&#x3c;0.1).

A cutting insert, and more particularly, an improved double-sided cutting insert is provided, which provides improved machinability obtained due to increased rake angle, without compromising coupling state. The double-sided cutting insert includes a top surface, a bottom surface, a plurality of lateral relief surfaces connecting the top and bottom surfaces, and a cutting edge formed by the top and bottom surfaces and the plurality of lateral relief surfaces, in which one or more lateral relief surfaces of the plurality of lateral relief surfaces are formed into three stages in sequence which are a first positive surface, a negative surface and a second positive surface in a direction from the top surface to the bottom surface.

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Cheongju-si, South Korea

Dong-Bok Park