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News & Topics 2016 Vol. 471

Sumitomo Electric Develops and Launches New Stainless Steel Turning Grade AC6020M

Sumitomo Electric Industries, Ltd. has developed the new AC6020M grade for finishing and general turning of stainless steel and launched it in November 2016 ... For more details

Sumitomo Electric Develops and Launches New Turning Grade AC1030U for High Precision Machining

Sumitomo Electric Industries, Ltd. has developed a new physical vapor deposition (PVD) coated insert grade, AC1030U, and launched it in November 2016 ... For more details

New SiC 6-inch Line Now on Operation at TIA Power Electronics Research Platform

National Institute of Advanced Industrial Science and Technology (AIST) and Sumitomo Electric Industries, Ltd. (Sumitomo Electric) have completed the construction of a new production line that enables large-scale production of silicon carbide (SiC) power semiconductor devices and commenced its operation at the TIA Power Electronics Research Platform ... For more details

A tensile strength measurement system of prestressed concrete (PC) cable using optical fibers jointly developed

Construction of upper Tsukidate Elevated Bridge in Route 115 (photo courtesy of Kajima Corporation)
Construction of upper Tsukidate Elevated Bridge in Route 115
(photo courtesy of Kajima Corporation)

Sumitomo (SEI) Steel Wire Corp. has developed a technology to measure the tensile strength of the entire length of PC cable by using optical fibers in cooperation with Kajima Corporation and Hien Electric Industries, Ltd.

The system measures the strain created on the optical fibers that are embedded in structural PC strand in advance to assess the distribution of tension over the entire length of the PC cable inside of a bridge beam, which was difficult to achieve by conventional technologies.

The technology enables the accurate tensile management not only during construction but also after construction and in service, contributing to the advanced and efficient maintenance of PC structure toward securing quality and durability of the whole structure.

This measuring technology was applied to the construction of the Tsukidate Elevated Bridge in Route 115 and its accuracy was verified by on-site measurement of stress on PC cable during tensioning work and the distribution of introducing tension (compressive force to concrete) after curing and construction.

The technology enables efficient assessment of structural soundness and substantially contributes to the future maintenance of structure, prevention of secondary accidents after earthquake disaster, and emergency recovery measures. Further development of applications, such as ground anchors to prevent failures of slant and slope, will be widely continued to ensure reliability of structures.

Incorporating optical fibers in PC strand

Incorporating optical fibers in PC strand
Optical fibers incorporated
in epoxy sheath

This technology enables:

  • ●measurement of tensile distribution over entire length of PC cable
  • ●measurement of tensile strength through wedges that fix tensioned PC strand without damaging optical fiber
  • ●in-service assessment of changes to tension of elongated PC strand

Optical fiber-embedded, epoxy coated and filled (ECF) strand

Two types of PC strands are available for this technology: the bare wire type that directly embeds optical fibers in PC strands and ECF type that embeds optical fibers into the sheath of ECF PC cable. Both types have had their measurement performance verified through various experiments assuming applications to bridges. Optical fiber-embedded ECF strand with the following features was selected for the outer cable of more than 180 meters in length over two spans in the Tsukidate Elevated Bridge.

*
ECF:Epoxy Coated and Filled

Features of ECF strand embedding optical fiber:

(1) Excellent durability

  • ・Optical fibers are embedded in epoxy coating and thus high anti-corrosive performance similar to normal ECF stand is realized.
  • ・High-coating adhesion similar to normal ECF strand is realized in epoxy coating sealing test and bending test.

(2) Reliability in measurement

  • ・Optical fibers embedded in epoxy coating create consistent behaviors with PC strand, enabling reliable measurement of tension distribution over the entire length.

(3) Practical structure

  • ・Solid resin coating minimizes the risk of damage on optical fibers during construction, enabling similar rough handling of normal ECF strand.
Sumitomo (SEI) Steel Wire Corp.

Keynote Paper Award won at the World PM2016 Conference and Exhibition

Sumitomo Electric Sintered Alloy, Ltd. won the Keynote Paper Award for its technical paper “New Hardening Processes for Transmission Synchronizer Hubs” at the World PM2016 Conference and Exhibition sponsored by the European Powder Metallurgy Association (EPMA). This award was received for the first time among Asian scientists.

Sumitomo Electric Sintered Alloy, Ltd. provides sintered synchronizer hubs used for automobile transmissions. In recent years, with the establishment of multiple-stage shaping technologies, more and more near-net-shap manufacturing of complicated forms has been employed. This paper introduces the establishment of new processing technologies aiming for improved productivity and the achievement of large-scale production. The technology focuses on an epoch-making process that enables high-precision production by simultaneously conducting both sintering and heat-treatment processes, and thus contributes to the provision of economical, high-strength products.

Award ceremony
Award ceremony
Powder Metal Products Division and Sumitomo Electric Sintered Alloy, Ltd.

Sumitomo Electric Group won the Best RFIT2016 Award

A research paper introducing the latest achievements regarding millimeter-wave compound semiconductor integrated circuits developed by Sumitomo Electric and Sumitomo Electric Device Innovations, Inc. won the RFIT Award at the RFIT2016 IEEE International Symposium on Radio-Frequency Integration Technology, held in August 2016 in Taipei, Taiwan. The award, acclaiming the paper as the best among 120 conference papers, showed high appreciation of the advanced circuit and device technologies developed by the Sumitomo Electric Group.

Tsuneo Tokumitsu, Chief Engineer of Sumitomo Electric (left) and Prof. Ke Wu, President of IEEE Microwave Theory and Techniques Society (right) at award ceremony
Tsuneo Tokumitsu, Chief Engineer of Sumitomo Electric (left) and Prof. Ke Wu, President of IEEE Microwave Theory and Techniques Society (right) at award ceremony
Transmission Device Lab. and Sumitomo Electric Device Innovations, Inc.

Sumitomo Electric Device Innovations commended by Director of Yamanashi Labor Bureau

Director Suzuki, General Supervisor of Safety and Health
Director Suzuki, General Supervisor of Safety and Health

The Yamanashi Plant of Sumitomo Electric Device Innovations Inc. received an award for superiority from the director of the Yamanashi Labor Bureau. This award is granted to business facilities that have achieved high levels of safety and health and have provided models that other business entities can follow. The award is designed to commend such companies’ efforts and to make them known among citizens in the prefecture, thereby increasing awareness of safety and health, ensuring workers’ safety and good health, and promoting the formation of a comfortable work environment.

Sumitomo Electric Device Innovations

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