Hitachi Metals, Ltd.

Nisshin Steel Co., Ltd.

Makoto Sasaki

Yoshihito Yoshizawa

Junichi Watanabe

Shinichi Kazui

Masanori Ochiai

Tomoyuki Satoh

Daichi Azuma

Naoki Ito

Shinichi Koga

Eisuke Ogawa

Naoki Itoh

Taizo Matsuda

Akihito Mizuno

The invention provides a wound magnetic core which is configured by winding an Fe-based amorphous alloy ribbon, the wound magnetic core containing a recess row including plural recesses formed by laser irradiation in a central part of the Fe-based amorphous alloy ribbon in a width direction, in which a ratio of a length of the central part to a total width is from 0.2 to 0.8.

Wound magnetic core and method of producing the same

A roll for a hot-dip metal coating bath has a substantially cylindrical shape. At least an outer peripheral surface of the roll is formed of a ceramic material. A relatively coarse groove is formed on the outer peripheral surface of the roll in a direction crossing the rotation axis. A plurality of relatively fine grooves is formed in the bottom surface of the coarse groove along the longitudinal direction of the coarse groove. In place of the fine grooves extending in the longitudinal direction of the coarse groove, a plurality of rows of fine grooves may be formed along the crosswise direction of the coarse groove.

Roll for molten metal plating bath and method for manufacturing the same

Provided is a wire rod for an I-type oil ring, which includes right and left rail portions and a web portion connecting the rail portions, which has an oil hole or a molten through hole formed in the web portion, and which has a circumscribing circle diameter of 10 mm or less in its transverse contour. The molten through hole has such a remolten portion formed on its exit side as encloses the exit of the molten through hole. The remolten portion exceeds such a molten portion in the transverse section along the center of the molten through hole as is formed in the molten through hole, and is formed to have 200 &#x3bc;m or less from the outer circumference of the molten through hole and 100 &#x3bc;m or less in the depth direction of the molten through hole.

Wire for I-shape oil rings and producing method of the same

A soft-magnetic, amorphous alloy ribbon produced by a rapid quenching method, having transverse lines of recesses formed on its surface by laser beams with predetermined longitudinal intervals, with a doughnut-shaped projection formed around each recess; doughnut-shaped projections having smooth surfaces substantially free from splashes of the alloy melted by the irradiation of laser beams, and a height tof 2 &#x3bc;m or less; and a ratio t/T of the depth tof the recesses to the thickness T of the ribbon being in a range of 0.025-0.18, thereby having low iron loss and low apparent power.

Soft-magnetic, amorphous alloy ribbon and its production method, and magnetic core constituted thereby

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Kumagaya, Japan

Makoto Sasaki