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Newsletter "SEI NEWS" 2011

Home > Company Information > SEI WORLD > Back number > Vol.401

[Newsletter "SEI NEWS" Vol.401]

Sintered Components

Many conventional alloys are made by melting several metals together; these are called casting alloys. Sintered components, on the other hand, are produced by powder metallurgy techniques characterized by compacting metal powders and sintering the compaction. They offer advantages not available with casting alloys.

Five features of sintered components

• Suitable for production of composite parts
• Suitable for mass production
• High dimensional accuracy
• Suitable for creating complex forms
• High yield rate

We produce sintered components as follows:

Manufacturing process


Example applications of sintered components

Chassis and body

Chassis and body


Chassis and body

Drive train

Drive train


Drive train





Environmentally-Conscious Products

Recent motor vehicles are equipped with fuel-efficient components, such as variable valve timing (VVT) and continuously variable transmission (CVT) parts, in view of rising environmental awareness. Sintered parts are frequently found in such environmentally-conscious products.

Variable valve timing (VVT) mechanical parts


Oil pump rotor parts (in CVT etc.)

"SUMI ALTOUGH" (high-performance powder metallurgy aluminum alloys)

SUMI ALTOUGH (high-performance powder metallurgy aluminum alloys)

SUMI ALTOUGH was developed by Sumitomo Electric in response to demand for automotive weight reduction. Made from rapidly solidified aluminum powders, these aluminum alloys, though light, offer high strength, good wear and heat resistance, and low thermal expansion in comparison to conventional cast aluminum alloys.



Iron-based sintered components known under the name of Lubrite are mass-produced at high productivity into complex, high-precision structural parts. They are widely used as important structural parts in motor vehicles, office instruments and home electric appliances, where high precision and high functionality are required.

Lubrite Development History

The history of Lubrite began in the post-World War II period, when oil-retaining bearings were produced from copper powder. In the 1950s, the proliferation of home electric appliances led to increased demand for Lubrite bearings. Aiming to tap the market for increased Lubrite usage, Sumitomo Electric planned to develop innovative mechanical parts from iron powder. We commercialized gears and cams for use in sewing machines, knitting machines and electric tools. In the 1960s, the market grew further with the increasing use of automobiles. At the same time, however, price competition became intense and business profitability declined. Furthermore, we were at a technological impasse regarding Lubrite. To use the material in automotive applications we faced many challenges, such as strength and tenacity improvements, complex geometry requirements, various surface treatments and impregnation. There was an urgent need for technological innovation. In the spring of 1963, therefore, we concluded a technical service contract with Krebsoge of Germany. Obtaining technical expertise from them and achieving our proprietary technological development, we succeeded in dramatically promoting our Lubrite business, which expanded in pace with the subsequent growth in motorization.

Development of choke coil dust cores?power device components in hybrid electric vehicles (HEVs) and electric vehicles (EVs)

Dust cores for choke coils (ER core shape)

Up to 50% volume reduction and 30% reduction in copper wire usage, in comparison with conventional dust cores

We have optimized the raw material composition of the dust core, applying our original material structure control technology to reduce conversion loss, and have successfully increased flux density by packing materials at high density. These dust cores will contribute to the future proliferation of environmentally friendly automobiles such as HEVs and EVs.

Website for sintered products

- SUMI ALTOUGH and Lubrite are trademarks or registered trademarks of Sumitomo Electric Industries, Ltd.

2011 Index
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