Neturen Co., Ltd.

National Institute for Materials Science

Futaba Corporation

Toshiba Corporation

Oita University

Kabushiki Kaisha Toshiba

Nissan Motor Company Limited

Keio University

Nihon Parkerizing Co., Ltd.

Nanocarbon Research Institute Ltd.

Kazuhiro Kawasaki

Fumiaki Ikuta

Yoshiaki Inoue

Yoshitaka Misaka

Seiji Yokota

Takahiko Kanai

Kotobu Nagai

Akira Terajima

Munehisa Hatta

Masao Hayakawa

Naotoshi Matsuda

Masaaki Tamatani

Keiko Albessard

Miwa Okumura

Takehiko Itagaki

Hirofumi Takemura

Yutaka Kiyosawa

Tetsuya Ono

Masato Sugimoto

Osamu Idohara

Kazutomi Oka

Eizaburou Nakanishi

Tsuyoshi Yoshida

Toshio Hijikata

Kengo Fukazawa

Yuji Gotoh

Eizaburo Nakanishi

Toshihiro Aiba

Masayuki Miyake

Shigeo Itoh

Yoshimasa Tanaka

Takeshi Tonegawa

Masateru Taniguchi

Fumiaki Kataoka

Mamoru Namikawa

Arata Suda

Kunihiro Kobayashi

Masaaki Beppu

Yoshihisa Marushima

Youhei Fujimura

Kenta Sakurai

Makoto Takahashi

Kenji Nawamaki

Eiji Osawa

Yoshihiro Ikeda

Yasuyuki Koyata

Hisaki Koga

Sadanori Takayama

Yasumoto Kubo

Takahiro Fujino

Jun Komotori

Shinjiro Motoki

Shumpei Ota

Noriyoshi Takaoka

Takehito Itagaki

An induction heating system includes induction heating apparatuses, each including a high-frequency current transformer, a low-frequency current transformer and a heating coil, a high-frequency input switch connected to the high-frequency current transformer, a low-frequency input switch connected to the low-frequency current transformer, a first power source to output a high-frequency electric power and a low frequency electric power, a second power source, a first power source output switch connectable to the first power source, a second power source output switch connectable to the second power source, and a switch controller. Each induction heating apparatus includes a heater controller to send a signal to the switching controller to turn on one of the first power source output switch and the second power source output switch, to turn off the other, and to switch on or off each of the high-frequency input switch and the low-frequency input switch.

Induction heating system, induction heating method, output monitoring apparatus, output monitoring method, and induction heating apparatus

An object of the present invention is to provide, as a simple method, a surface nitriding treatment method of a titanium material, forming a hardened nitrided layer excellent in abrasion resistance on the surface of a titanium material in a shorter time. In order to achieve the object, the present invention adopts a surface nitriding treatment method of a titanium material, wherein a hardened nitrided layer is formed on the surface of the titanium material, by blowing nitrogen gas at a flow rate of 10 L/min or more to the surface of the titanium material while the titanium material is being heated to 800&#xb0; C. to 1000&#xb0; C. in an inert gas atmosphere.

Surface nitriding treatment method of titanium material

An apparatus is provided to measure a depth of a hardened layer formed at a surface layer of a quenched workpiece. The apparatus includes an exciting coil configured to generate a magnetic flux to magnetize the workpiece and a detecting coil configured to detect the magnetic flux generated by the exciting coil. The exciting coil has a U-shaped excitation core portion and an excitation coil portion wound on the excitation core portion. The excitation core portion is arranged such that distal ends of magnetic poles of the excitation core portion face the workpiece. The detecting coil has a detection core portion and a detection coil wound on the detection core portion. The detection core portion is arranged between the magnetic poles of the excitation core portion and along a surface of the workpiece.

Hardened layer depth measuring apparatus

Object of the present invention is to provide a welding method prevented the fracture at the spot welding zone by recovering the strength of a spot welding zone, namely, the ductility and the toughness in the spot welding zone, and a weld structure manufactured by the method. In the welding method, a spot welding zone provided with a weld nuggetis formed by conducting spot welding on the heat treated steel sheets in a stack; the spot welding zone is tempering treated by the high-frequency electrical current application to make the weld nugget have a hardness of 150% or less of the hardness of the heat treated steel sheets, and the heat affected zone surrounding the weld nugget is made to have a hardness of 30% to 90% of the hardness at the weld nugget before the tempering treatment by the high-frequency electrical current application.

Welding method and weld structure

A welding equipment for metallic materials capable of performing heat treatment such as tempering based on partial heating in spot welding is provided. The welding equipment sandwiches metallic materials with a pair of electrodes, and heats different regions of the metallic materials by energization, with the pair of electrodes maintained at the same position with respect to the metallic materials. The welding equipment includes a first heating means connected to the pair of electrodes for heating and welding the internal region of the circle defined by projecting the cross-sectional area of the axis of the electrodes on the metallic materials by applying power having a low first frequency, a second heating means for heating a ring-shaped region along the circle by applying power having a second frequency that is higher than the first frequency, and an energization control unit for independently controlling the first and the second heating means.

Welding equipment for metallic materials and method for welding metallic materials

A welding structural partis manufactured by overlapping the surfaces of steel sheets, and forming a weld zone by spot welding. The weld zoneincludes: a weld nugget; and a heat affected zonesurrounding the weld nugget, wherein the hardness in the weld zone increases along an exterior regionof the heat affected zonetoward the heat affected zone, and then decreases along the heat affected zonetoward the central region of the weld nugget. In the boundary region between the weld nuggetand the heat affected zone, the weld nuggetmay have a convex portionA bulging into the heat affected zonealong the overlapped portion. The steel sheetscontain carbon in 0.15 mass % or more.

Welding structural part and welding method of the same

A quenching depth measuring method is used for measuring the quenching depth in a workpiece and includes the steps of: magnetizing the workpiece by disposing, in the vicinity of the workpiece, a magnetizer equipped with an exciting coil; detecting, through a detection coil, an induced magnetic field generated by the magnetization; measuring the induced magnetic field as the output voltage of the detection coil; and specifying the thickness of the quenched hardened layer of the workpiece on the basis of known electromagnetic characteristic information of an unquenched material and a fully-quenched material and an output voltage value measured by the detection coil, the unquenched material being made of the same material as the constituent material of the workpiece and being a material on which a quenching process is not performed, the fully-quenched material being a material on which the quenching process is performed.

Quenching depth measurement method and quenching depth measurement apparatus

A welding equipment for metallic materials capable of performing heat treatment such as tempering based on partial heating in spot welding is provided. The welding equipmentsandwiches metallic materialswith a pair of electrodes, and heats different regions of the metallic materialsby energization, with the pair of electrodesmaintained at the same position with respect to the metallic materials. The welding equipment includes a first heating meansconnected to the pair of electrodesfor heating and welding the internal region of the circle defined by projecting the cross-sectional area of the axis of the electrodes on the metallic materials by applying power having a low first frequency, a second heating meansfor heating a ring-shaped region along the circle by applying power having a second frequency that is higher than the first frequency, and an energization control unitfor independently controlling the first and the second heating means

A high-strength die-quenched partis formed by heating a high-strength steel sheetup to an austenite region, hot stamping and cooling inside a mold, and its microstructure has the martensite wherein carbide particlesare finely dispersed over an entire region including prior-austenite grain boundaries. It is desirable that the prior-austenite grain size in the microstructure of the high-strength steel sheet, which is a base material, be 10 &#x3bc;m or smaller. The high-strength die-quenched part has high-strength and high-ductility thanks to its martensite.

High-strength and high-ductility die-quenched parts and method of manufacturing the same

Providing an iron and steel material having quenched surface part, avoiding oxidation of a compound layer formed on the surface of the iron and steel material due to quenching, its production method, and an induction-quenched component. A quenched iron and steel materialcomprises an iron and steel material, a compound layerformed on the iron and steel material, and an antioxidant cover layerformed on the compound layer. The iron and steel materialhas a hardened layer having a given depth, and the surface of the iron and steel materialhas enhanced hardness. A method for producing the iron and steel materialcomprises a first step for forming the antioxidant cover layerto cover the compound layerformed on the iron and steel material, and a second step for applying induction hardening to the iron and steel materialhaving the compound layerand the antioxidant cover layer, with the temperature increased in a given heating time until the given heating temperature is reached, and with cooling immediately performed once the heating temperature is reached.

Iron and steel material having quenched surface layer part, method for producing the iron and steel material, and quenched component

A heat treatment apparatuscomprises a supporting unitfor supporting a columnar workpieceturnably, and an induction-heating coilfor induction-heating the workpiecesupported turnably by the supporting unit. Below the workpiecesupported by the supporting unit, a cooling tankis provided which contains a liquid coolant. The workpieceis made of steel such as carbon steel for mechanical structure, and spring steel. The workpieceis made of a material which has a magnetic transformation point at 770&#xb0; C. The material is ferromagnetic below this temperature, and becomes paramagnetic above this temperature.

Heat treating device and heat treating method

A non-evaporation getter material suitable for non-evaporation getters disposed in electron devices, such as fluorescent luminous tubes. The getter material is sized and shaped to more efficiently absorb gases actively at low temperatures.

Electron devices with non-evaporation-type getters and method for manufacturing the same

Ultradispersed ones of primary particles of nanometer-sized carbon are obtained by applying a wet-type milling method and/or a wet dispersion method to an aggregate structure of the primary particles to overcome van der Waals forces, by which forces the primary particles are held together to form the aggregate structure, whereby the ultradispersed primary particles are obtained in a colloidal dispersion on a large-scale basis at low cost without using any additive. In a method of manufacturing the ultradispersed primary particles, the wet-type milling method is carried out in a ball mill, preferably in combination with a high-energy ultrasonic-wave process carried out in a dispersing medium such as pure water, whereby a colloidal solution or slurry with a low-concentration of the primary particles ultradispersed in the dispersing medium is obtained.

Ultra-dispersed nanocarbon and method for preparing the same

In the method, apparatus and the substance produced thereby: a plasma flame 1 is produced by a plasma torch 11; the plasma flame 1 is passed through a plasma flame furnace 21 which controls the heat of the plasma flame 1; then, the plasma flame 1 is injected into a reactor column 31 to heat the substance. The substance may be a particle. The plasma flame 1 has a wide flame area in which a temperature of flame is uniform.

Heat treatment method and apparatus using thermal plasma, and heat

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Tokyo, Japan

Kazuhiro Kawasaki