Aida Engineering, Ltd.

Aida Engineering Co., Ltd.

Masakazu Hashimoto

Shozo Imanishi

Takao Ito

Takashi Koshimizu

Toshihiko Arai

Hiroshi Hosoya

Yoshinori Kato

Tadao Odaka

Masaharu Kusunoki

Kazuo Kitazawa

Shinichi Kaji

Hiromichi Miyata

Touru Miyashita

Osamu Mishima

Shinjiro Sato

Yoshiyuki Hashimoto

A plurality of closing cylinder devices are provided between a bolster of a press machine and a bed containing a lower mold of a hydroforming device. An upper mold is attached to a slide of the press machine. The upper mold and lower mold come together to form a cavity having the shape of the exterior of the desired molded product. A closing block, being movable between a first position which is between the slide and a crown of the press machine, and a second position, which avoids the slide, permitting free movement of the slide from the crown to the lower mold. When a material to be hydroformed is place in the lower mold, the upper mold is lowered. The closing block is fit into its first position, thereby restricting movement of the slide in the vertical direction. A inner work pressure is provided by a fluid inside the material to be molded. The closing cylinder devices provide a pressure, based upon the inner work pressure, to maintain the cavity at the desired shape, preventing the upper mold and the lower mold from being separated by the inner work pressure.

Hydroforming method and hydroforming device

A Slide driving apparatus of press machine, wherein a main gear 3 as a rotational drive member and a lever member 10 as a driven member are opposed to one another in a eccentric state which an axes O.sub.1 and O.sub.2 are separated, the main gear 3 and the lever member 10 being connected to one another by a connecting member 13 consisting of a pin member 11 and a bush member 12. A drive rotation locus A which can be traced, round the axis O.sub.1, by a movement of a connecting center O.sub.5 where the main gear 3 and the connecting member 13 are connected, and a driven rotation locus B which can be traced, round the axis O.sub.2, by a movement of a connecting center O.sub.4 where the lever member 10 and the connecting member 13 are connected, intersect one another at points of C and D. A slide of the press machine is connected, by the connecting rod, to an eccentric portion 8A of the crankshaft 8 where the lever member 10 is fixed.

Slide driving apparatus of press machine

In a transfer press having feed bars and a press drive, an improved feed bar driving apparatus has a vertical rod reciprocally movable in association with the press drive and having a threaded portion, a drive means to the vertical rod means for rotating the vertical rod means in opposite directions, a feed screw device connected to the threaded portion of the vertical rod for being rotated by the vertical rod in opposite directions by rotation and reciprocation of the vertical rod, a pair of feed bar receptacles slidably supporting the feed bars and connected to the feed screw device for being moved toward and away from each other when the feed screw device is rotated in respective opposite directions for moving the feed bars in a clamping and unclamping movement, a cam rotatable in assocation with the press drive, a lever mounted on a fulcrum and connected to the vertical rod and in contact with the cam for being pivoted around the fulcrum by the cam for moving the vertical rod through a stroke, and a stroke adjusting mechanism connected to the fulcrum for changing the position of the fulcrum for selectively adjusting the stroke of the vertical rod and thereby adjusting the stroke of the feed bars.

Apparatus for clamping and unclamping feed bars for a transfer press

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Tokyo, Japan

Masakazu Hashimoto