Gohsyu Corporation

Nobuyasu Nishihata

Kenji Tasaki

Tadashi Okumura

Sakae Nishigori

[Problem] To present a manufacturing apparatus of a plate-like tooth profile member capable of forging and forming in one process by using a closed type die, being hardly accompanied by burrs due to plastic changes in the circumferential direction and in the axial direction of the material of the plate-like tooth profile member. [Solving Means] Consisting of an upper dieand a lower dieof closed type, the lower dieis composed of a tooth diefor forming a tooth portion in a material W of a plate-like tooth profile member, and movable diesmovable relatively in a vertical direction to the tooth diedisposed at both sides in the axial direction of the material W of the plate-like tooth profile member of the tooth die, a first stroke is executed for confining the circumference at both end portions in the axial direction of the material W of the plate-like tooth profile member by the upper dieand the movable dies, and a second stroke is executed for forming a tooth portion in the material W of the plate-like tooth profile member by the upper dieand the tooth die

Manufacturing apparatus of plate-like tooth profile member

The objective of the present invention is to provide a forging method that improves workability in machining, by turning the metallographical structure of products subject to impact load to a fine ferrite-perlite structure, without adopting the method of quenching and tempering, to obtain, as strength, a yield point (YP value) exceeding that obtained by the method of quenching and tempering, and making the tensile strength (TS) smaller compared with the method of quenching and tempering. A material to be forged has at least one kind of group 5 metal added thereto and is heated to a temperature suitable for hot forging. After forging to prescribed shape, cooling, and holding for a prescribed set time in a furnace at a tempering temperature, the material is further cooled to normal temperature by natural cooling.

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Konan, Japan

Nobuyasu Nishihata