Toyota Jidosha Kabushiki Kaisha

Kabushiki Kaisha Toyota Chuo Kenkyusho

Tokyo Sintered Metals Corporation

Hiroshi Okajima

Akira Manabe

Mikio Kondo

Setsuto Daiza

Tadataka Kaneko

Yoshihiko Ito

Shigehide Takemoto

Yoji Awano

Yositaka Takahasi

Takeshi Hattori

Yoshitaka Takahashi

Shin Tajima

Mikio Kondoh

Masatoshi Sawamura

Satoshi Uenosono

Yositaka Takahashi

Akira Sekiguchi

Naoki Miyagawa

To provide an iron-based sintered alloy excellent in shape accuracy and wear resistance, and reduced hostility to mating materials, and having sufficient hardness after tempering, as well as a manufacturing method thereof. Iron-based alloy powder of a composition comprising Cr: from 1 to 3.5 mass %, Mo: from 0.2 to 0.9 mass %, V: from 0.1 to 0.5 mass % and the balance of Fe and impurities, and carbon powder are mixed at a ratio of the carbon powder based on the entire portion within a range from 0.8 to 1.1 mass %, the mixture is compacted, the compacted body is sintered and quenching is applied to the sintered body heated again after once lowering temperature of the sintered body. This can provide an iron-based sintered alloy where fine MCcarbides are dispersed in martensitic texture.

Iron-based sintered alloy and manufacturing method thereof

A pressurizing forming process includes the steps of applying a higher fatty acid-based lubricant on a surface of a metallic workpiece and/or a forming surface of a forming tool, and forming, wherein a lubricating film including metallic soap is formed on a pressurized-and-contacted interface, at which the surface of the metallic workpiece and the surface of the forming tool are pressed against and are brought into contact with each other, in forming the metallic workpiece by pressurizing with the forming tool. The metallic workpiece and/or the forming tool can be heated prior to or in the forming step.

Pressurizing forming process and pressurized-and-formed member

The present invention is an apparatus for filling a multi-powder including a powder box () including a plurality of powder chambers storing a plurality of powders whose constituent compositions differ in a divided manner, and a gas feed pipe () disposed on the bottom side of the powder chamber and having an introducing hole for introducing a gas, wherein it can fill a plurality of the powders into a cavity () at once through the bottom openings of the powder box by introducing a gas through the introducing hole to substantially equalize the respective flow resistances of a plurality of the powders. Thus, it is possible to fill the powders whose constituent compositions differ at once without disposing them in a mixed manner.

Composite powder filling method and composite powder filling device, and composite powder molding method and composite powder molding device

This invention provides a method of forming a powder compact which can produce a high density compact under a high pressure and at the same time can reduce pressure for ejecting the compact from a die. This method comprises the application step of applying a higher fatty acid lubricant to an inner surface of a heated die, and the compaction step of filling metal powder into the die and compacting the metal powder under such a pressure as to force the higher fatty acid lubricant to be chemically bonded with the metal powder and form a metallic soap coating. Since the metallic soap coating is formed between the die and a compact, friction force between the die and the compact is decreased and ejecting pressure can be remarkably decreased despite of compaction with high pressure. Besides, a high density compact can be obtained owing to the compaction with high pressure.

Method of forming a powder compact

The present invention is characterized in that, in a powder magnetic core obtained by compaction of an iron-based magnetic powder covered with an insulation film, a saturation magnetization Ms is Ms&#x2267;1.9 T in a 1.6 MA/m magnetic field; a specific resistance &#x3c1; is &#x3c1;&#x2267;1.5 &#x3bc;&#x3a9;m; a magnetic flux density Bis B&#x2267;1.1 T in a 2 kA/m magnetic field; and a magnetic flux density Bis B&#x2267;1.6 T in a 10 kA/m magnetic field. In accordance with the present invention, it has been possible to industrially carry out compacting iron-based magnetic powders under remarkably high compacting pressures. As a result, high-performance powder magnetic cores are obtained which have a high density, and which are good in terms of the specific resistance and magnetic permeability.

Dust core and method for producing the same

A method and apparatus for filling a cavity with powder wherein a pipe having holes for discharging gas is disposed in a powder box and gas is discharged into the powder in the powder box as the powder enters the cavity so that particles of the powder are movable relative to each other. Due to the gas discharge, the powder can enter the cavity smoothly without whirling up in the cavity and settling unevenly, so that a filling time period is shortened and a particle size distribution in the cavity is uniform.

Method and apparatus for filling powder

A process for producing a sliding member employs a base material having a covering surface and pores, and a layer material comprising a constitutive component for reacting with a constitutive component of the base material. Initially, the layer material comes into contact with at least part of the covering surface of the base material. Next, the both are heated to the sintering temperature of the base material. Thus, a molten liquid occurs at the boundary between the base material and the layer material. Since the solidus temperature of the molten liquid increases with the reaction proceeding, the molten liquid can solidify early to seal the pores at the covering surface of the base material early. Therefore, the layer material remains on the covering surface of the base material, the remaining layer material comes to constitute a sliding surface.

Process for producing a sliding member and a process for producing a

Disclosed are an Fe-based alloy powder adapted for sintering, an Fe-based sintered alloy, and a process for producing the Fe-based sintered alloy. The Fe-based alloy powder or the matrix of the Fe-based sintered alloy consists, percent by weight, essentially of 2.0 to 15% Co, 2.0 to 10% Mo, and the balance of Fe and inevitable impurities. The Fe-based alloy powder exhibits superb compressibility and corrosion resistance, and accordingly the Fe-based sintered alloy made therefrom exhibits excellent wear resistance, corrosion resistance and oxidation resistance. The Fe-based sintered alloy is further improved in the excellent properties by dispersing novel Ni-based alloy hard particles in the matrix.

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Aichi-ken, Japan

Hiroshi Okajima