Kabushiki Kaisha Kobe Seiko Sho

Kobe Steel, Ltd.

Masakazu Ueda

Akira Asari

Tatsuhiko Noyori

Takahiko Ishii

Tsuneharu Masuda

Takahisa Tabuchi

Takeo Nishimoto

Toshio Kurosaki

Munenori Soejima

Hiroshi Okamoto

Masanobu Aoki

Kuniaki Kanda

Takashi Kajima

Masaru Sugamoto

A press device which is reduced in overall height thereof and in deformation of a press frame and can sufficiently support an eccentric load thereto. The press device comprises a press force generating unit disposed in a press frame and including a lid member secured to the press frame, a cross head having a cylinder chamber in which the lid member is fitted for axial sliding movement and having a blank holder at an end face thereof remote from the lid member, and a pressurizing member fitted for axial sliding movement in a portion of the cylinder chamber remote from the lid member. A shaping element is disposed in the press frame in an opposing relationship to the press force generating unit and has a shaping portion in which the pressurizing member is fitted. A guide element is connected to the cross head for guiding the cross head for axial sliding movement, and a cross head actuating device is connected to the cross head for axially moving the cross head under the guidance of the guide element independently of the pressurizing member.

Press device

Method of and apparatus for indirect extrusion

An indirect extrusion press in which a seal block (16) is provided with a disc portion (18) to be fitted in a billet receiving bore (25) of a container (24) and is also provided with a cylindrical portion (19) contiguous to the disc portion (18) and having an outside diameter larger than the billet receiving bore (25) which is provided at the fore end of a pressure stem (15), and a die stem (21) is disposed in front of and coaxially with the pressure stem (15). Billet (V) is loaded onto an axis of the press by means of a billet loader (29), then charged into the billet receiving bore (25) of the container (24) from the pressure stem (15) side and then extruded through the die stem (21) in a state wherein one end of the billet receiving bore (25) of the container (24) is closed with the seal block (16). A plurality of circumferentially spaced notches (20) are formed in the press axis direction on the outer periphery of the cylindrical portion (19) of the seal block (16), both the container (24) and the billet loader (29) are movable toward the pressure stem (15), and a billet support portion (35) provided at the fore end of the billet loader (29) is formed with projections (39) adapted to engage the notches (20) and be guided thereby, the projections (39) being formed in the press axis direction.

Indirect extrusion press

An indirect extrusion press including a press frame body of the Rahmen structure. The press frame body is formed of a press platen and a main cylinder frame, which are rigidly connected together. Movably disposed between the press platen and main cylinder frame is a container adapted to retain a billet therein. A die stem fixedly extends toward the container from the platen while a pressing stem slidably extends toward the container from the main cylinder frame. Hydraulic cylinders are provided with the platen to shift the container back and forth along the longitudinal center line of the press. Hydraulic coupling cylinders are also provided with a crosshead from which the pressing stem extends and the pistons of both cylinders are connected to their respective container holders. The relative position of the container and pressing stem is maintained constant during an extrusion stroke so that the container-shifting force is added to an extrusion force. An effective scalping operation of the container is performed by using not only the container-shifting cylinders but also the coupling cylinders. An intermediate frame may also be slidably provided on the die stem such that the shifting force for the intermediate frame may also be added to the extrusion force or scalping force. The extra extrusion force is received by the container and its related moving members, thereby enabling use of the press frame body without reinforcement and allowing a reduction in the total number of parts and weight necessary, and simplification of the press.

A mandrel cleaning device capable of automatically performing cleaning operation in an extrusion press of the type which has a pressurizing stem for pressing a billet in a container toward a die and a mandrel axially slidable in and relative to the pressurizing stem for determining the internal shape of a hollow extruding material, the mandrel cleaning device having a rotary mechanism for rotating the mandrel about its axis, a grinder mechanism adapted to grind a tip portion at the fore end of the mandrel, and a transfer mechanism for moving the grinder mechanism toward and away from the mandrel.

Mandrel cleaning device for extrusion press

An indirect extrusion process making use of an apparatus having a main ram and a container which are adapted to be driven independently of each other, the container being moved during the extrusion at a speed equal to or higher than that of the main ram, so as to produce the extrusion force, characterized in that the movement of the container relative to the main ram is prevented so that the power for moving the container may be added to the extrusion force, so as to effect extrusion without causing change in the relative position between the container and the billet during extrusion, and that the main ram and the container are connected at a desired position in accordance with the length of the billet, making use of the frictional force exerted between the container and said billet, such that extrusion may be effected with respect to container and the billet in connected state of operation.

Indirect extrusion process

Growing community of inventors

Kobe, Japan

Masakazu Ueda