Korloy Inc.

Sun-Yong Ahn

Seung-Su Ahn

Sung-Gu Lee

Je-Hun Park

Sung-Hyun Kim

Jung-wook Kim

Young-Heum Kim

Sang-Yong Lee

Jae-hoon Kang

Ki-chan Nam

Kane-hee Lee

Dong-Bok Park

Nam-Sun Lee

Beom-sik Kim

Dong-Youl Lee

Kyung-il Kim

Kyoung-il Kim

Yong-hyun Kim

Jin-han Gwon

Young-nam Choi

Seong-mo Park

Seong-woo Cho

Soon-yong Hong

The present invention relates to a cutting tool, which performs, like a drill or a ball end mill, cutting while rotating in a state in which the center of the tip end is in contact with a work material, and includes a wear-resistant layer formed at the tip end thereof, wherein a portion of the wear-resistant layer is selectively removed through tip end polishing from the center of the tip end of the drill or the ball end mill to a predetermined area, so as to restrain micro-brittle wear generated in an ultra-low speed region, and thus remarkably improving the cutting lifespan of the cutting tool such as the drill or the ball end mill.

Cutting tool having partially-removed film formed thereon

The present invention relates to a hard film having improved wear resistance and improved toughness. A hard film according to the present invention is formed by using a PVD method on a surface of a base material, wherein: the hard film includes a first hard layer and a second hard layer; the first hard layer has a thickness of approximately 0.1-3.0 &#x3bc;m and is composed of TiAlN (0.3&#x2264;a&#x2264;0.7), and has a single phase structure; and the second hard layer has a thickness of approximately 0.5-10 &#x3bc;m and is composed of TiAlMeN (0.3&#x2264;a&#x2264;0.7, 0&#x2264;b&#x2264;0.05, the Me being at least one selected from V, Zr, Si, Nb, Cr, Mo, Hf, Ta and W); according to an XRD phase analysis method, a ratio ([200]/[111]) of the intensity of a [200] peak to the intensity of a [111] peak is approximately 1.5 or higher; the second hard layer preferentially grows in a [200] direction; the [200] peak is located at approximately 42.7&#xb0;-44.6&#xb0; and is composed of three phases, and the [111] peak is located at approximately 37.0&#xb0;-38.5&#xb0; and is composed of three phases; and when a peak having a largest intensity among the peaks of the three phases is a main peak and remaining peaks are sub-peaks, a ratio (main peak/sub-peaks) of the intensity of the main peak to the intensities of the sub-peaks in a [200] face is approximately 2 or higher, and a ratio (main peak/sub-peaks) of the intensity of the main peak to the intensities of the sub-peaks in a [111] face is approximately 2 or higher.

Hard film having excellent wear resistance and toughness

A hard coating includes a thin film layer which has a total thickness of 0.5-10 &#x3bc;m and has an overall composition of AlTiMeN (0.2&#x3c;a&#x2264;0.6, 0&#x3c;b&#x2264;0.15), where Me is a nitride constituent element having a thermal expansion coefficient of greater than 2.7&#xd7;10/&#xb0; C. and less than 9.35&#xd7;10/&#xb0; C., wherein the thin film layer has a structure in which a nano-multilayered-structure of thin layers A, B and C, thin layer B being disposed between thin layer A and thin layer C, is repeatedly laminated at least once.

Hard coating for cutting tool

The present invention relates to a hard coating including an MT-TiCN layer and an &#x3b1;-alumina layer which are formed by using a chemical vapor deposition method. A hard coating for cutting tools, which is a coating formed on a base material of a cutting tool formed of a hard material, the coating comprising: a TiCN layer; and an &#x3b1;-alumina layer formed on the TiCN layer, wherein: the &#x3b1;-alumina layer has a main peak (maximal strength peak) of (006) plane located between 20-40 degrees during a psi rocking analysis by an XRD; a residual stress in the &#x3b1;-AlOlayer is &#x2212;0.9-0.4 GPa; the TiCN layer is composed of TiCNO(x+y+z&#x2264;1, x&#x3e;0, y&#x3e;0, z&#x2265;0); a composition ratio of C/(C+N) is greater than or equal to 0.4 and smaller than 0.5; the ratio of TC(220)/TC(422) is smaller than 0.45; and the ratio of TC(220)/TC(311) is less than 0.45.

Hard coating film for cutting tool

A cemented carbide comprises particles including a tungsten carbide (WC) as a main component; a binder phase including cobalt (Co) as a main component; and particles including a carbide or a carbonitride of at least one selected from the group consisting of Group 4a, 5a, and 6a elements, or a solid solution thereof, wherein a cubic phase free layer (CFL), in which the carbide or the carbonitride is not formed, is formed from a surface of the cemented carbide to a depth of 5 &#x3bc;m to 50 &#x3bc;m.

Cemented carbide with improved toughness

A cutting tool comprises a base material which includes particles including a tungsten carbide (WC) as a main component, a binder phase including cobalt (Co) as a main component, and particles including a carbide or a carbonitride of at least one selected from the group consisting of Group 4a, 5a, and 6a elements, or a solid solution thereof; and a hard film formed on the base material, wherein the hard film comprises at least an alumina layer, a cubic phase free layer (CFL), in which the carbide or the carbonitride is not formed, is formed from a surface of the base material to a depth of 10 &#x3bc;m to 50 &#x3bc;m, and a Co content of a surface of the CFL is 80% or more of a maximum Co content of the CFL.

Cutting tool

Provided are a cutting insert and a tool holder on which the cutting insert is provided. The cutting insert includes a circular upper surface, a circular lower surface, a cylindrical lateral surface for connecting the upper surface and the lower surface, an upper cutting edge formed between the upper surface and the lateral surface, a lower cutting edge formed between the lower surface and the lateral surface, and a plurality of rotation-preventing parts provided at the lateral surface so as to prevent the cutting insert from rotating with respect to the tool holder. Each rotation preventing part includes an inner curved surface recessed toward the center of the lateral surface and convexly rounded so as to form concentric circles in conjunction with the lateral surface, and a stepped rotation-preventing surface parallel to the axial direction of the insert and connecting the inner curved surface and the lateral surface.

Cutting insert and tool holder on which cutting insert is provided

The purpose of the present invention is to provide a cutting insert capable of reducing cutting load and enhancing squareness. A cutting insert, according to one embodiment of the present invention, comprises: first and second end surfaces which face opposite directions to each other and have four corners wherein two ascending corners are placed in one diagonal position, and two descending corners lower than the height of the ascending corners are placed in the remaining diagonal position; first and second main side surfaces which are placed between the first and second end surfaces, face in opposite directions to each other, and have a throughhole connecting the first and second main side surfaces to each other; and first and second auxiliary side surfaces placed between the first and second end surfaces and between the first and second main side surfaces, wherein, when seen from the first or second end surface, each of the first and second main side surfaces comprises: a central main clearance surface placed on a central portion thereof; a first peripheral main clearance surface which is placed between the central main clearance surface and the ascending corners, and which forms an obtuse angle with respect to the central main clearance surface such that the central main clearance surface may protrude; and a second peripheral main clearance surface which is placed between the central main clearance surface and the descending corners, and forms an obtuse angle with respect to the central main clearance surface such that the central main clearance surface may protrude.

Cutting insert

A technical object of the present disclosure is to provide an insert, which can maintain rigidity thereof regardless of a clearance angle of a clearance surface that forms a circular cutting edge. To this end, the insert according to the present disclosure includes a circular upper surface, a circular lower surface, and a clearance surface portion connecting the upper surface and the lower surface. The clearance surface portion is divided into first and second clearance surfaces along a circumference thereof, by a first wave line that forms a waveform of valleys facing the lower surface and mounts facing the upper surface.

Insert, tool holder, and assembly thereof

A technical object is to provide an insert capable of preventing escaping of the insert from an assembly of the insert and a tool holder. To this purpose, the insert includes an insert body, and a holder fastening portion provided in the insert body to be fastened to the tool holder, in which the holder fastening portion includes one or more fastening holes formed through the insert body from an upper surface to a lower surface, and one or more locking recesses formed by being recessed in a lower surface periphery of the insert body.

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).

Growing community of inventors

Cheongju-si, South Korea

Sun-Yong Ahn