Korloy Inc.

Seung-Su Ahn

Je-Hun Park

Sun-Yong Ahn

Sung-Gu Lee

Sung-Hyun Kim

Dong-Bok Park

Jung-wook Kim

Jae-hoon Kang

Kyoung-il Kim

Beom-sik Kim

Kyung-il Kim

Jin-han Gwon

Young Heum Kim

Young-Heum Kim

Dong-Youl Lee

Seoun-Yong Ahn

Se-ung Oh

Seong-mo Park

The present invention relates to a cutting tool consisting of a hard base material, such as cemented carbide, cermet, ceramic, and cubic boron nitride, and a hard coating film formed on the hard base material. In the cutting tool according to the present invention, the hard coating film, which is composed of a monolayer or multilayer structure, is formed on a base material, wherein the hard coating film comprises a layer composed of an oxide, wherein in the layer composed of an oxide, the oxygen content of an edge center of the cutting tool is higher than the oxygen content in an area distanced from the edge center by 50 μm or more.

Cutting tool with hard coating film formed thereon

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

Disclosed is a PVD ceramic thin film-coated cutting insert properly usable for machining a hard-to-cut material such as inconel or titanium having low thermal conductivity. The cutting insert for hard-to-cut materials includes a cemented carbide base material having an SMS value of 50-80% obtained by [Formula 1] below, and a ceramic thin film formed on the cemented carbide base material and having a thickness of about 0.4-1.5 &#x3bc;m. [Formula 1]: SMS=Saturation magnetization value of sintered body&#xd7;100/TMS, where TMS=2010&#xd7;Mass ratio of Co.

Cutting insert for hard-to-cut material

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

Disclosed is a hard coating film formed on a hard base material such as cemented carbide. The hard coating film has a nanoscale multilayered structure to have improved oxidation resistance and wear resistance. The hard coating film is a hard coating film formed on the base material. The first layer is composed of a TiAl nitride having a composition of TiAl(0.3&#x2266;a&#x2266;0.7), and the second layer has a nanoscale multilayered structure or a structure in which the nanoscale multilayered structure is repeatedly laminated at least two times, the nanoscale multilayered structure including a thin layer A composed of an AlTiSi nitride, a thin layer B, a thin layer C composed of a AlCr nitride, and a thin layer D having thicknesses of 3 nm to 20 nm. The thin film B and the thin film D are composed of a TiAl nitride.

Hard coating film for cutting tools

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).

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Cheongju-si, South Korea

Seung-Su Ahn