Mitsubishi Materials Corporation

Mitsubishi Materials Kobe Tools Corporation

Mmc Kobelco Tool Co., Ltd.

Koichi Maeda

Natsuki Ichimiya

Yusuke Tanaka

Yasuyuki Yamada

Kazuaki Tanaka

Masanori Morikawa

Yuki Matsuoka

Kenji Yamamoto

Toshiki Sato

Tatsuya Yasunaga

Taiitsu Aoki

Genki Matsumoto

Seiichiro Kitaura

Akihiro Kondo

Yasutaka Okazaki

This invention provides a surface-coated cutting tool which exhibits excellent fracture resistance and wear resistance in high-speed cutting, such as high-speed gear cutting, high-speed milling, and high-speed drilling. The surface-coated cutting tool includes a hard coating layer composed of an alternately laminated layer structure of at least a thin layer A and a thin layer B formed on the surface of a tool substrate, such as a cemented carbide substrate, a cermet substrate, and a high-speed tool steel substrate. The thin layer A is an (Al, Cr, Si)N layer which satisfies a compositional formula: [AlCrSi]N (0.2&#x2266;X&#x2266;0.45, 0.4&#x2266;Y&#x2266;0.75, 0.01&#x2266;Z&#x2266;0.2, and X+Y+Z=1 in terms of atomic ratio). The thin layer B is an (Al, Ti, Si)N layer which satisfies a compositional formula: [AlTiSi]N (0.05&#x2266;U&#x2266;0.75, 0.15&#x2266;V&#x2266;0.94, 0.01&#x2266;W&#x2266;0.1, and U+V+W=1 in terms of atomic ratio).

Surface-coated cutting tool

A cutting tool made of surface-coated cemented carbide having the hard coating layer formed on the surface of a cemented carbide substrate, wherein the hard coating layer has a top layer and a bottom layer, the top layer includes a structure having the thin layer A and the thin layer B being stacked alternately, with the thin layer A having the composition of [TiAlSi]N (A is in a range from 0.01 to 0.06 and B is in a range from 0.25 to 0.35 in an atomic ratio) and the thin layer B having the composition of [TiAlSi]N (C is in a range from 0.30 to 0.45 and D is in a range from 0.10 to 0.15), and the bottom layer comprises single phase structure having the composition of [TiAlSi]N (E is in a range from 0.50 to 0.60 and F is in a range from 0.01 to 0.09).

Cutting tool made of surface-coated cemented carbide with hard coating layer exhibiting excellent wear resistance in high speed cutting operation of high hardness steel

The invention provides a high-speed tool steel gear cutting tool in which fracture or chipping does not occur at the cutting edge, and which realizes excellent cutting performance over long periods. Moreover, a method of manufacturing a gear cutting tool including: a step for quenching a tool material comprising high-speed tool steel and which has been rough processed to a shape corresponding to a final shape of a gear cutting tool, to transform a structure of the tool material into martensite, a step for temperling the tool material after quenching to transform any residual austenite dispersingly distributed throughout a matrix of the martensite structure formed by the quenching, into martensite, and a step for finishing the tool material after tempering to a final shape, is characterized in that the tool material after quenching is subjected to sub-zero treatment involving cooling and holding at a temperature of less than &#x2212;150 &#xb0; C.

Manufacturing method for high-speed tool steel gear cutting tool

The invention provides a high-speed tool steel gear cutting tool in which fracture or chipping does not occur at the cutting edge, and which realizes excellent cutting performance over long periods. Moreover, a method of manufacturing a gear cutting tool including: a step for quenching a tool material comprising high-speed tool steel and which has been rough processed to a shape corresponding to a final shape of a gear cutting tool, to transform a structure of the tool material into martensite, a step for temperling the tool material after quenching to transform any residual austenite dispersingly distributed throughout a matrix of the martensite structure formed by the quenching, into martensite, and a step for finishing the tool material after tempering to a final shape, is characterized in that the tool material after quenching is subjected to sub-zero treatment involving cooling and holding at a temperature of less than &minus;150&deg; C.

High-speed tool steel gear cutting tool and manufacturing method therefor

Hard coating coated member having excellent wear resistance

Growing community of inventors

Akashi, Japan

Koichi Maeda