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Koike S.,Sumitomo Electric | Hirose K.,Sumitomo Electric | Tsuda K.,Advanced Materials R and D Laboratories | Yamagata K.,Sumitomo Electric
SEI Technical Review | Year: 2014

In recent years, due to the rising prices and increased use of minor metals, cermet tools that use less tungsten are in the spotlight. Coated cermet tools, used for various purposes from rough machining to finishing, need to have stable and high-quality cutting performance and a long service life. In order to meet these user needs, Sumitomo Electric Hardmetal Corporation has developed a new coated cermet T1500Z. Employing Brilliant Coat, a next-generation lubrication film, T1500Z displays superior lubrication performance and significantly reduces the reaction with ironbased metals. Consequently, T1500Z reduces cutting resistance by 30% as compared to conventional grades. T1500Z has a wide application range and contribute to processing cost reduction. Source


IzumIda H.,Advanced Materials R and D Laboratories | Shimizu K.,Advanced Materials R and D Laboratories | Takamura S.,Sumitomo Corporation | Shimoda Y.,Sumitomo Corporation | And 2 more authors.
SEI Technical Review | Year: 2012

High-carbon steel wires, such as piano, hard-drawn, or oil-tempered wire, are used for automotive and electronic parts. Despite their outstanding advantages in strength, ductility, and fatigue resistance, these wires are susceptible to fracture due to the brittle as-quenched martensite structure formed by welding. To overcome this problem, we have developed a high-strength steel wire that consists of a bainitic matrix phase to enhance weldability, by adding carbide former elements to low-carbon steel. The developed wire features 1) a finely recrystallized bainite phase in place of the brittle martensite phase even after welding treatment, 2) work hardening behavior and tensile strength equal to and 3) a softening resistance superior to those of a piano wire, 4) a low degradation in the tensile strength (approx. 4%) after welding, and 5) a fatigue limit equivalent to that of a piano wire after 2 × 106 rotational bending. Sumitomo (SEI) Steel Wire Corp. has already started supplying the wire and is currently working to broaden its application field. Source


Sumiya H.,Advanced Materials R and D Laboratories | Harano K.,Advanced Materials R and D Laboratories | Murakami D.,Sumitomo Electric
SEI Technical Review | Year: 2012

The authors have succeeded in the production of single-phase (binderless) nano-polycrystalline diamond (NPD) by the direct conversion sintering of graphite at ultra-high pressure and temperature. NPD, consisting of diamond grains of several tens of nanometers, having fine texture, extreme hardness, and high strength without showing cleavage features and anisotropy of mechanical properties. These salient characteristics indicate that NPD has outstanding potential as industrial material suitable for cutting tools and wear-resistant tools. To evaluate the cutting performance of NPD tools, the authors conducted precision cutting tests using various work materials such as Al-Si alloy, ceramics, and cemented carbides in the respective conditions. NPD tools demonstrated significantly high cutting performance in each test compared with both conventional polycrystalline diamond tools and single-crystal diamond tools, indicating that NPD holds great promise in applications for various cutting and processing tools. Source


Ishida T.,Advanced Materials R and D Laboratories | Itakura T.,ALMT Corporation | Moriguchi H.,Advanced Materials R and D Laboratories | Ikegaya A.,Advanced Materials R and D Laboratories
SEI Technical Review | Year: 2012

Tungsten, the main component of cemented carbide tools, is subject to supply risk. This work considered two countermeasures: recycle and saving. For recycling, hydrometallurgy process was investigated in order to use all applications of tungsten resources. Although the hydrometallurgy process requires large-scale production facilities for cost effectiveness, we have solved the problem by developing high efficiency and low cost technique specializing for recycling cemented carbide. For tungsten saving, a composite structure of cemented carbide and cermet was developed to reduce tungsten usage. We report the cutting performance and breakage resistance of the composite structured tool. Source


Zheng X.,Automotive Technology R and D Laboratories | Ishimine T.,Advanced Materials R and D Laboratories | Yamamoto S.,Automotive Technology R and D Laboratories | Tokuoka T.,Advanced Materials R and D Laboratories | And 4 more authors.
SEI Technical Review | Year: 2012

Sumitomo Electric Industries, Ltd. has developed magnetic powder core materials for power inductors used in eco-friendly vehicles. Pure iron based powder cores with an operating frequency range from 10 kHz to 30 kHz have been used for boost converter reactors in hybrid-electric vehicles (HEVs), while low-loss Fe-Si-Al alloy powder cores with an operation range of several hundred kHz have shown the potential to replace ferrite cores for buck converter choke coils. Our lowloss alloy powder cores are also a competitive alternative for choke coils in plug-in HEV and EV on-board chargers, which generally operate in a range from 50 kHz to 200 kHz. This paper compares differences in size, weight, power loss, and DC-bias characteristics between E-type choke coils that are respectively designed with the Fe-Si-Al alloy powder cores and ferrite cores for the power factor correction (PFC) of the charger. The simulation results show that alloy powder cores significantly reduce the size and weight of choke coils compared with ferrite cores. This paper also describes a new choke coil structure that we have developed to improve the heat dissipation of E-type choke coils. The experimental results indicate that the newly designed coil has a lower operating temperature than that of E-type choke coils. Source

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