Hitachi Metals, Ltd.

Amino Iron Works Co., Ltd.

Masao Murakawa

Tsunehiro Kawata

Mitsuaki Mochizuki

Michihisa Shimizu

Kiyoyasu Ohkawa

The permanent magnetic alloy of the present invention comprises an R&#x2014;Fe&#x2014;B alloy wherein R is at least one element selected from rare earth elements including Y. The R&#x2014;Fe&#x2014;B alloy has a composition mainly comprising Fe, substantially containing no N, and containing 4 at. % or more of B. The permanent magnetic alloy substantially comprises a TbCuhard magnetic phase (main phase) and a fine crystal having an average crystal grain size of less than 5 nm and/or an amorphous phase, and has high magnetic properties.

Permanent magnetic alloy and bonded magnet

A press for manufacturing helical gears having a punch with a cutting edge; a die with a cutting edge, one of the cutting edges being shaped as a helical gear and the other having a shape corresponding to the shape of the one cutting edge; and a bolster rotatable about an axis and provided with one of the die and the punch. The die and said punch are pressed together and the bolster is rotatably driven by a driving element in response to a lead of a helical gear to be manufactured. The stroke of the punch is detected and a desired rotation angle of a driving element is calculated and then signalled to the driving element.

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Saitama, Japan

Masao Murakawa