Toyota Jidosha Kabushiki Kaisha

Ube Machinery Corporation, Ltd.

Ube Kosan Kikai Kabushiki Kaisha

Hidenori Uebayashi

Tsukasa Kato

Yoshiki Matsuura

Hiroaki Furuya

Takashi Izuo

Takeshi Sakuragi

Takashi Hirai

Kaoru Fujii

Hajime Morimoto

Keiichi Oikawa

Junji Manabe

Die opening-closing means includes a servo motor and a movement conversion mechanism and is disposed between a support plate and a base stand. A movable plate is mounted on the support plate that is disposed on the base stand via a linear movement guide. In a forging cycle, die opening and closing is performed by activation of the die opening-closing means and tie bar fixing means at a rear surface side of the movable plate, and clamping force is obtained using a die clamping cylinder provided in the movable plate. When it is necessary to change over exclusive dies and change over is performed by: extending tie bar removal cylinders provided in a frame behind the movable plate so as to remove tie bars from a fixed plate; and moving a movable rail of internal rails to an open position and moving the change over carriage in along the internal rails from the outside.

Molding apparatus and die changing apparatus for exclusive die

A movable platen () capable of advance and retraction with respect to a fixed plate is provided with a tie bar connecting device () for meshing a split nut () with the multiple groove portion () of a tie bar (), and a mold clamping cylinder () operable with the split nut () serving as a reaction force point. The mold clamping cylinder () comprises a primary piston () contacting the split nut () and a secondary piston () movable relative to the primary piston (). It is arranged that the movable platen () is stopped just before the position at which the movable mold contacts the fixed mold, and in this state the split nut () is reliably meshed with the multiple groove portion (). Thereafter, the secondary piston () and primary piston () are moved integrally with respect to the movable platen () so as to effect mold contacting and mold clamping. After molding, the secondary piston () and the primary piston () are relatively moved to effect mold release.

Mold clamping device and molding method

In a molding machine, a fixed platen which supports a fixed die is disposed on one end of a base plate. A movable platen which supports a movable die and a supporting mount which supports each one end portion of the four tie bars are mounted on slide units. The movable platen and the supporting mount are advanced so as to close the die, a tip portion of each tie bar is locked to the fixed platen by a lock mechanism, and a die clamping cylinder provided on the movable platen is actuated to generate a clamping force so as to execute molding. After that, the lock mechanism executes an unlocking operation so as to cause the movable platen and the supporting mount to retreat to a die open position. Furthermore, an attaching and detaching mechanism releases the die clamping cylinder so as to cause only the supporting mount to significantly retreat from the movable platen, and thus the four tie bars are completely evacuated from the fixed die and the movable die.

Molding machine and molding method

An electromagnetic drive-type die casting decompression valve comprises a drive shaft, provided inside a drive block, driven by electromagnetic force from a solenoid, and a valve shaft, provided inside a valve block separate from the drive shaft, provided with a valve body on one shaft end. Also, a closing spring working jointly to urge the valve body in a closing direction is provided on the valve shaft, while an opening spring working jointly to urge the valve body in the opening direction is provided on the drive shaft. The valve block is also provided in a replaceable manner. According to this type of electromagnetically driven die casting decompression valve, bouncing is not caused at the time of closing a decompression valve, and it is also possible to significantly decrease maintenance time and repair costs even when problems arise, such as molten metal infiltrating into a valve body.

Electromagnetic drive-type die casting decompression valve, drive method for such a valve, and a die casting unit

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Toyota, Japan

Hidenori Uebayashi