Toshiba Kikai Kabushiki Kaisha

Takaki Miyauchi

Jun Koike

Makoto Nishizawa

Nobuyuki Muroi

Haruyuki Matsubayashi

Noriyuki Sasaki

Hideaki Kitta

Hiroyuki Onuma

Masato Kinoshita

Haruhiko Kikuchi

An opening/closing apparatus is provided for use in a molding apparatus, such as an injection molding machine. The opening/closing apparatus may eliminate the influence of a slight gap formed between a bush and a pin in a link connecting portion of a toggle link mechanism and in addition, can enhance workability e.g., in mold replacement. An opening/closing apparatus of the present technology may include an opening/closing mechanism including a toggle link mechanism connecting a pressure-receiving platen and a movable platen; a drive mechanism for driving the opening/closing mechanism; and a core-back hydraulic cylinder for applying a load to the movable platen in a given direction in conjunction with the first drive mechanism, configured to perform the operation of slightly opening of the mold.

Opening/closing apparatus and molding apparatus

Used in a method of this invention is a die clamping unit, which comprises a tie bar movably attached to a stationary platen, a halfnut positioning servomotor which advances and retreats to the tie bar, a halfnut which is provided on a movable platen and fixes the movable platen and the tie bar together by engaging the tie bar, an engaging mechanism which engages the halfnut with the tie bar, a hydraulic die clamping cylinder which presses the stationary platen and the movable platen, and a control device which controls the halfnut positioning servomotor and the hydraulic cylinder. The control device drives the halfnut positioning servomotor to remove a clearance between the halfnut and an engaging groove of the tie bar before a die clamping process carried out by the hydraulic cylinder.

Die clamping method

A stationary platen unit and a movable platen unit each include a platen body, a load transmission portion, a die fixing plate, and a backup member. The backup member is located between the platen body and the die fixing plate. The backup member is movable between a first position in which it is in contact with both the die fixing plate and the platen body and a second position in which it is separate from the die fixing plate and/or the platen body. When a large die set is attached to the die fixing plate, the backup member is situated in the first position. When a small die set is attached to the die fixing plate, the backup member is moved to the second position.

Clamping device and injection molding machine provided with clamping device

Used in a method of this invention is a die clamping unit, which comprises a tie bar movably attached to a stationary platen, a halfnut positioning servomotor which advances and retreats the tie bar, a halfnut which is provided on a movable platen and fixes the movable platen and the tie bar together by engaging the tie bar, an engaging mechanism which engages the halfnut with the tie bar, a hydraulic die clamping cylinder which presses the stationary platen and the movable platen, and a control device which controls the halfnut positioning servomotor and the hydraulic cylinder. The control device drives the halfnut positioning servomotor to remove a clearance between the halfnut and an engaging groove of the tie bar before a die clamping process carried out by the hydraulic cylinder.

Die clamping unit and die clamping method

A die clamping unit includes a stationary platen, a tie bar which is attached to the stationary platen, a movable platen which is movable forwards and backwards along the tie bar with respect to the stationary platen, a first servomotor which moves the movable platen away from the stationary platen in a core-back operation, a second servomotor which moves the movable platen forwards and backwards to perform die-opening and -closing, and a control device which drives the first servomotor to move the movable platen away from the stationary platen and which drives the second servomotor to apply a force to the movable platen in the direction toward the stationary platen in the core-back operation.

Die clamping unit

A die drive unit has a cylinder mechanism which hydraulically drives a piston member and an additional drive mechanism which drives the piston member by means of a drive source other than a hydraulic one. A first oil chamber is formed on one side of the piston member. A second oil chamber and a third oil chamber are formed on the other side of the piston member. The first oil chamber and the second oil chamber are connected to each other by an oil passage. The piston pressure receiving area of the first oil chamber is equal to the sum of those of the second and third oil chambers.

Die drive unit of molding machine

A support device for a movable die comprises a linear guide, a base, a movable platen, a driving mechanism which linearly moves the base, and a securing mechanism which secures the movable platen to the base. The base is guided by the linear guide and is linearly movable. A movable die is mounted to the movable platen, and the movable platen is mounted on the base. When the movable platen undergoes a deformation with a pressure of die clamping, the securing mechanism absorbs a displacement of the movable platen in a base movement direction or a vertical direction due to the deformation.

Movable-die support device and die clamping unit

There is provided an apparatus capable of smoothly swiveling an injection unit of medium or large motor-driven injection molding machine. The apparatus comprises: a slide base which is provided on a frame so as to be linearly movable; injection unit bases and which are stacked on the slide base so as to be relatively movable and on which an injection unit is mounted; a nozzle touch mechanism having ball screw feed mechanisms and for converting the rotation of a motor into thrust for the slide base ; a pivot for pivotably connecting the injection unit bases and to the slide base ; a pivot pin for restricting the forward movement of the injection unit base to switch the state of the injection unit base to a pivotable state; a pin connecting portion , which is provided at a position, at which the pin connecting portion integrated with the injection unit base is deviated from the pivot , for connecting the injection unit base to the pivot pin so that the forward movement of the injection unit base is restricted by the pivot pin to be converted into a swiveling motion; a pin supporting portion , secured to the frame , for supporting the pivot pin so that the pivot pin is slidable in axial directions; and a pin operating portion for causing the pivot pin to be inserted into and extracted from the pin connecting portion

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Numazu, Japan

Takaki Miyauchi