Hitachi Powdered Metals Co., Ltd.

Honda Giken Kogyo Kabushiki Kaisha

Hitachi Chemical Company, Ltd.

Junichi Ichikawa

Hideo Shikata

Zenzo Ishijima

Jun Sakai

Hideo Urata

Katsuhiko Ueda

Tomoyuki Kohida

Osamu Mawatari

Tomoaki Arakawa

Tamio Takada

Shuji Sasaki

Satoshi Onodera

Kensuke Nakata

Kenzo Morita

Syuji Sasaki

Method of forming a compact based on the press forming method provides a compact having high density and not having cracking or surface roughness in a product and without compact adhesion to press forming mold wall occurring, including steps: filling raw material powder in a cavity formed by an outer mold and lower punch, or outer mold and lower punch and core rod, pressing and forming raw material powder between an outer punch and lower punch, and extracting the compact obtained out of the outer mold by the lower punch, wherein a lubricating film of a press forming mold lubricant containing oil as main component is formed on at least part of outer mold inner surface, or outer mold inner surface and core rod outer circumferential surface before filling the raw material powder in the cavity, and press forming so that compact density ratio is not less than 93%.

Method for forming molded article by press molding

A sintered gear comprises: plural tooth portion having a tooth flank and a tooth bottom land; a high density area formed over entire surface of the tooth portion, the high density area having a density of 7.6 Mg/mor more and formed with a depth of 1 mm or more from the surface; a low density area formed in deeper area than the high density area, the low density area having a density of 7.3 Mg/mor less; and an intermediate area formed between the high density area and the low density area, the intermediate area having a density gradient in which the density is gradually decreased from the high density area to the low density area.

Production method for sintered gear

Disclosed is a manufacturing method of sinter forged aluminum-based parts with high strength. In the manufacturing method, prepared is a raw material powder comprising, by mass: 3.0 to 10% zinc; 0.5 to 5.0% magnesium; 0.5 to 5.0% copper; inevitable amount of impurities; and the balance aluminum. The raw material powder is formed into a compact by pressing the raw material powder, sintered in a non-oxidizing atmosphere in such a manner as to heat the compact at a sintering temperature of 590 to 610 degrees C. for 10 minutes or more, before cooling the sintered compact. It is then forged by pressing the sintered compact in a pressing direction to compress the sintered compact in the pressing direction and produce plastic flow of material in a direction crossing to the pressing direction.

Manufacturing method of sinter forged aluminum parts with high strength

Disclosed is a thin plate member for forming a semiconductor package, having a recess for receiving a semiconductor chip. The thin plate is composed of sintered metal, e.g. sintered copper or sintered alluminum alloy. A sintered metal body being porous and having a shape which is close to the shape of the thin plate member is prepared, and it is sized into the shape of the thin plate member. The sintered alluminum alloy comprises 0.4 to 0.8% by weight of magnesium, 0.2 to 0.6% by weight of silicon and the balance aluminum and has a structure comprising an aluminum phase being formed of aluminum particles and an alloy phase being composed of magnesium, silicon and aluminum and interposing between the aluminum particles, and the sintered copper has a metallographic structure comprising a phase of copper particles.

Thin plate member for semiconductor package and manufacturing method therefor

Sheet metal member, method of manufacturing same, and heat radiation

There is provided a connecting rod including a connecting rod body and a cap having excellent alignment properties, and a method of producing such a connecting rod. A connecting rod body and a cap are produced through the steps of molding green compacts respectively corresponding to the connecting rod body and the cap; sintering and unifying both the green compacts; forging the resultant sintered product in a mold; and fracturing the resultant forged product. The green compact corresponding to the cap and/or the green compact corresponding to the connecting rod body includes opposite circumferential end faces formed with one or more projection. A clearance c is formed between both circumferential end faces of the sintered product due to the projection. With this clearance c, both the circumferential end faces are formed with recesses and projections which are fitted to each other during the forging process and which are relatively large and thus have large biting amounts. During the fracturing process, the recesses and the projections are separated into two pieces.

Process for producing connecting rod

A plurality of blanks divided at a division end face 5 or a blank-bonded product comprising a plurality of blanks sintered and bonded together are or is compressed in the same mold, so that they are plastically deformed until the division end faces 5 are cohered. Thereafter, a load is applied to the plastically worked product in a direction of breaking of the division end faces 5 to break the division end faces 5 and divide the plastically worked product into a plurality of members. In this manner, a split type mechanical part having irregularities meshed with each other on mating faces and easily positionable relative to each other can be produced with a good dimentional accuracy.

Process for producing split type mechanical part

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Matsudo, Japan

Junichi Ichikawa