Daido Tokushuko Kabushiki Kaisha

Honda Giken Kogyo Kabushiki Kaisha

Diado Tokushuko Kabushiki Kaisha

Sachihiro Isogawa

Hiroaki Yoshida

Junichi Esaki

Toshihiko Matsubara

Atsuyoshi Kimura

Katsuyoshi Sakoda

Masamichi Kawano

Takashi Sako

The present invention relates to a process of producing a permanent magnet, which includes extruding a preform to form a plate-shaped permanent magnet, in which the preform is extruded in such a way that a dimension of a cross section of the preform is reduced in an X-direction and enlarged in a Y-direction perpendicular to the X-direction. The present invention also relates to a plate-shaped permanent magnet formed by extruding a preform, in which the preform is extruded in such a way that a dimension of a cross section of the preform is reduced in an X-direction and enlarged in a Y-direction perpendicular to the X-direction, whereby the permanent magnet has a strain ratio &#x3b5;/&#x3b5;with respect to the preform in a range of 0.2 to 3.5, in which &#x3b5;is a strain in the direction of the extrusion of the preform and &#x3b5;is a strain in the Y-direction.

Process of producing permanent magnet and permanent magnet

A method for manufacturing a ring-shaped magnet includes arranging, in a penetrating hole formed in a die, a mandrel having a cylinder tip portion of a diameter d, a cylinder base end portion of a diameter d, provided d&#x3c;d, and a taper portion positioned between the cylinder tip portion and the cylinder base end portion. The penetrating hole includes a first penetrating hole portion of a diameter D, a second penetrating hole portion of a diameter D, provided D&#x3c;D, and a tapered hole portion of a positioned between the first penetrating hole portion and the second penetrating hole portion. The cylinder tip portion is loaded with a preform, and plastic-working is performed on the preform in a gap formed by the penetrating hole and the mandrel by pressing the preform with a pressing punch.

Method for manufacturing ring-shaped magnet material and manufacturing apparatus used therefor

An improved method of forging a precipitation hardening type stainless steel. The method comprises the steps of soaking the precipitation hardening type stainless steel at a temperature of austenitizing range, cooling the steel to a temperature in the range of 200-700&deg; C., preferably 400-600&deg; C., and subjecting the steel to forging at the temperature in this range. Conventional lubricants and die cooling oils can be used without being deteriorated due to high temperature. It is preferable to forcibly cool the soaked steel to adjust the temperature of the steel at which it is forged. The forged steel is then age hardened to exhibit inherent hardness.

Method of forging precipitation hardening type stainless steel

A high-strength member of precipitation hardening martensitic steel is manufactured through the steps of heating precipitation hardening martensitic stainless steel at an austenitizing temperature, performing the first plastic working at a temperature between 200.degree. C. and 700.degree. C. so as to leave a part of austenite as retained austenite at the time of cooling the steel at Ms point or below thereafter, cooling the steel at the temperature not higher than Ms point, performing the next plastic working at a temperature not higher than As point so as to transform the retained austenite into martensite, and performing age hardening treatment at a temperature between not lower than 370.degree. C. and lower than 480.degree. C.

Method for manufacturing high-strength member of precipitation hardening

Manufacturing titanium alloy component by beta forming

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Nagoya, Japan

Sachihiro Isogawa