Korloy Inc.

Sung-Gu Lee

Sun-Yong Ahn

Seung-Su Ahn

Je-Hun Park

Sung-Hyun Kim

Jung-wook Kim

Dong-Bok Park

Jae-hoon Kang

Kyung-il Kim

Yong-hyun Kim

Young Heum Kim

Seoun-Yong Ahn

Se-ung Oh

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

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 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

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).

Growing community of inventors

Cheongju-si, South Korea

Sung-Gu Lee