Nissei Plastic Industrial Co., Ltd.

Takemi Uehara

Takashi Hakoda

Hozumi Yoda

Hirofumi Murata

Susumu Morozumi

Isamu Yamaguchi

Kazuyuki Okubo

Satoru Tokida

Hiroyuki Handa

An injection molding apparatus includes an electric motor, a torque variable mechanism that changes an output torque of the electric motor, and a screw driving unit that transmits the output torque of the torque variable mechanism to a feed screw, whereby the feed screw is turned by the electric motor, the torque variable mechanism and the screw driving unit. The torque variable mechanism applies, to the feed screw, a torque equivalent to a hydraulic drive. The electric motor is interchangeable with a hydraulic motor to enable the injection molding apparatus to change between electric and hydraulic drive of the feed screw.

Injection molding apparatus

There are provided a first process Tin which a mold clamping motoris driven-controlled so as to move a cross headof a toggle link mechanismto a preliminary position Xr set in advance so as to become a position on the mold open side rather than a mold closure position Xs; a second process Tin which after the first process Tis finished, a mold thickness adjusting motoris driven-controlled so as to move a pressure receiving platenforward to a mold closed position Xc where a mold C is closed; a third process Tin which after the second process Tis finished, the mold clamping motoris driven-controlled so as to move the cross headforward, while the mold C is pressurized by torque limitation of the mold clamping motor, and the mold thickness adjusting motoris driven-controlled so as to move the pressure receiving platen, while the cross headis moved to the mold closure position Xs; and a fourth process Tin which, after the third process Tis finished, a clamping margin Lp of the mold C corresponding to a predetermined mold clamping force is set.

Method of adjusting mold thickness of toggle-type mold clamping device

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Nagano-ken, Japan

Takemi Uehara