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Mitsubishi Materials Kobe Tools Corporation

Kazuaki Tanaka

Yusuke Tanaka

Natsuki Ichimiya

Koichi Maeda

Yasuyuki Yamada

Masahiro Machida

Yuji Komori

Masataka Okayama

Kazutoshi Katoh

Nobukazu Kondo

Kenzo Takashina

Tomohisa Kohiyama

Yoshihiro Harada

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

An object is to provide a video recording/playing apparatus for facilitating recording/playing of motion pictures. The configuration is provided with, at least, a video input device for inputting analog motion pictures (video), a video capture device for digitizing the motion pictures inputted through the video input device and recording the digitized motion pictures and, at the same time, for converting the motion pictures inputted through the video input device into compressed motion pictures capable of being played in a high compression ratio and in a high picture quality and recording the compressed motion pictures, an information extracting device for extracting arbitrary information from the non-compressed motion pictures captured by the video capture device, a correspondence information generating device for associating the information extracted by the information extracting device with the compressed motion pictures captured by the video capture device, an input device for designating a result of the correspondence, and a compressed video playing device for playing the compressed motion pictures.

Video capture device

A heat treatment method of steel is capable of enhancing wear resistance, mechanical properties and dimensional stability of the steel due to the reduction of the retained austenite amount to substantially zero. In the method, an article of the steel is subjected to a quenching and then subzero treatment including cooling it at a cooling rate of 1 to 10&deg; C./min. to a cooling temperature and holding the cooling temperature for a predetermined period of time.

Heat treatment method of steel

Growing community of inventors

Akashi, Japan

Kazuaki Tanaka