Nippondenso Co., Ltd.

Other

Hitachi Metals, Ltd.

Kobe Alcoa Transportation Products Ltd.

Hitachi Metals, Ltd. and Denso Corporation

Keizo Takeuchi

Tsutomu Inui

Toshiaki Terada

Shinya Sugiura

Hakaru Sasaki

Yoshitada Katayama

Takayuki Shibata

Youichi Murakami

Sunao Fukuda

Masaki Shimizu

Kyoji Inukai

Kenzo Kiyose

Yoichi Sakaura

Jun Takigawa

Toshio Okuno

Youzou Majima

Tatsuo Miura

Yasuaki Isobe

Mituo Hashiura

Katsuaki Fukushima

Osamu Takezoe

Tadashi Okamoto

Tokio Hotta

Masakazu Ito

Yoshio Iwai

Kenichi Matsumoto

Etsuo Kokuryu

Sinya Nakagawa

Makoto Nisio

Jun Sunakawa

Tadashi Yamanaka

A sulfidation-resistant current-carrying member, such as a commutator, suitable for a direct-current motor in a fuel pump is provided. The current-carrying member for a direct-current motor in a fuel pump includes a commutator composed of a carbon layer having carbon as a principal component and forming a sliding surface at one end, and a metal carbon layer fixedly bound with the carbon layer at the other end and comprising 55 to 90 wt % of metal having brass as a principal component and a remaining portion having carbon as a principal component. By using brass as a primary metal component in the metal carbon layer, it is possible to achieve a commutator with superior resistance to sulfidation.

Current-carrying member for a direct-current motor in a fuel pump, method for producing the same, and fuel pump

Composite magnetic member, process for producing the member and electromagnetic valve using the member

A metallic member including not more than 0.6% C, 12 to 19% Cr, 6 to 12% Ni, not more than 2% Mn, not more than 2% Mo, not more than 1% Nb and the balance being Fe and inevitable impurities, where Hirayama's equivalent H eq=�Ni %!+1.05 �Mn %!+0.65 �Cr %!+0.35 �Si %!+12.6 �C %! is 20 to 23%; Nickel equivalent Ni eq=�Ni %!+30 �C %!+0.5 �Mn %! is 9 to 12%, and Chromium equivalent Cr eq=�Cr %!+�Mo %!+1.5 �Si %!+0.5 �Nb %! is 16 to 19, wherein % is by weight, is made to have at least one ferromagnetized part having a magnetic flux density B.sub.4000 of not less than 0.3 T and at least one non-magnetized part having a relative magnetic permeability .mu. of not more than 1.2 at a temperature of not less than -40.degree. C., as continuously and integrally formed. The non-magnetized part has crystal grain sizes of not more than 30 .mu.m. The metallic member is subjected to ferromagnetization and successive local non-magnetization of part or parts of the ferromagnetized member, and the thus obtained composite magnetic member is employed as a support member such as a sleeve in electromagnetic valves.

Composite magnetic member, process for producing the member and

A composite magnetic member formed of a single material having a ferromagnetic section with high soft magnetism and a non-magnetic or the like section with sufficiently low magnetic (feebly magnetized or non-magnetic) and sufficient low MS temperature and a process for producing the member are provided. A composite magnetic member made of a single material of martensitic stainless steel including Ni having two sections of a ferromagnetic section having maximum permeability not less than 200 and coercive force not more than 2000 A/m and a feebly magnetized section having permeability not more than 2 and MS temperature not more than -30.degree. C. A process for producing a composite magnetic member, comprising the steps of locally heating a single material of martensitic stainless steel having particular composition including Ni and having ferrite and carbide, at temperature of more than austenite transformation temperature, and rapidly quenching it so that austenite structure is formed in the heated and quenched section which structure has MS temperature not more than -30.degree. C.

Composite magnetic member and process for producing the member

A high-strength stainless steel for use as a material of a fuel injection nozzle or a fuel injection needle of an internal combustion engine. The stainless steel is an as annealed martensitic stainless steel which exhibits a hardness not less than HRC 58 after quenching and tempering heat-treatment. The limit swaging ratio of said as annealed martensitic stainless steel is not less than 75%. The hardness of said as annealed martensitic stainless steel is not higher than HB 157. Preferably, the number of carbides having sizes of 0.2 .mu.m or less occupies not more than 50% of the total carbides, and wherein the limit swaging ratio of said as annealed martensitic stainless steel is not less than 75% or the hardness of said as annealed martensitic stainless steel is not higher than HB 157. Preferably, the stainless steel has a chemical composition containing, by weight: 0.4 to 0.6% of C; not more than 0.5% of Si; not more than 0.5% of Mn; 8.0 to 13.0% of Cr; 0.1 to 2.0% of one or both of W and Mo in terms of W/2+Mo; one or both of 0.05 to 1.0% of one or both of Nb and V in terms of Nb/2+V, and 0.2 to 2.0% of Co; and the balance substantially Fe and incidental impurities.

High-strength stainless steel for use as material of fuel injection

An aluminum alloy composite material for brazing has a core member, an Al--Si filler member clad on one surface of the core member and an aluminum alloy cladding member clad on the other side of the core member. The core member is made of an aluminum alloy containing 0.3 to 1.3 wt. % of Si, 0.3 to 1.5 wt. % of Mn, 0.02 to 0.3 wt. % of Ti, and, as required, 0.3 wt. % or less of Cr and 0.2 wt. % or less of Zr, the content of Mg being restricted to 0.2 wt. % or less and the content of the Cu being restricted to 0.2 wt. % or less as an impurity. The cladding member is made of an aluminum alloy containing 0.3 to 3 wt. % of Mg, 5 wt. % or less of Zn, 0.1 to 1.0 wt. % of Si. The thickness of the core member is preferably, 2.5 times or more greater than that of the filler member, falling within a range of 0.1 to 1 mm. With this, it is possible to obtain an aluminum alloy composite material which cannot degraded in brazability and corrosion resistance even when brazed by the brazing method with noncorrosive flux and which has enough high strength to be used for a material of a high-strength heat exchanger, highly improved corrosion resistance and excellent brazability.

Aluminum alloy composite material for brazing

A method of manufacturing mechanical parts from the raw material of metal scrap such as shavings and turnings of castings and steel and press chips of steel, includes the steps of: preparing the metal scrap including shavings and turnings; forming a billet by pressing metal scrap; heating the billet to the forging temperature, whereby a satisfactory plasticity is given to the billet for plastic deformation of metal scrap in the succeeding process; and forming the heated billet into a forged workpiece by use of a semi-closed forging die. The shape of the billet is determined such that, in this forging step, the respective portions of the billet are subjected to plastic deformation having a given plastic deformation rate, whereby material flow sufficient to generate metallic bond at the respective portions is caused, and burred portions are formed on portions of the forged workpiece mainly subjected to extrusion press during die-forging.

Method of manufacturing mechanical parts from metal scrap

Growing community of inventors

Handa, Japan

Keizo Takeuchi