Toshiba Machine Co., Ltd.

Toshiba Kikai Kabushiki Kaisha

Fumiyuki Katoh

Jun Koike

Makoto Nishizawa

Yutaka Yamaguchi

Kiyoshi Sasaki

Yukio Iimura

Masahiro Tamaki

Tsuginobu Totani

Toshihiro Kasai

Kazuhito Kobayashi

Harumichi Tokuyama

Hiroyuki Onuma

Akira Kanda

Katsuhito Ogura

Junsuke Kawai

Katsuyoshi Kido

Tatsuhiko Maru

Hajime Kitamura

Akihide Okube

Katsumi Watanabe

A screw is incorporated in a heating barrel, and the tail end of the screw is rotatably supported by the front surface of an intermediate plate. Behind the intermediate plate, two linear motor units are connected in parallel and arranged around the shaft of the screw to form axial symmetry. The output shafts of the linear motor units are connected to the tail end of a driving shaft through a common connecting arm, and the leading end of the driving shaft is fixed to the rear surface of the intermediate plate. Each of the liner motor units is constituted by a plurality of voice coil linear motors connected in parallel. Each of the linear motor units can be independently controlled. Voice-coil linear motors to be used are selected according to the type of product to be manufactured.

Injection molding machine

A front plate and rear plate are connected to each other through a plurality of the bars. An intermediate plate is arranged between the front plate and the rear plate and guided by the tie bars to be movable. The front plate is fixed to a slide table. The rear plate and intermediate plate are supported by a linear slide guide on the slide table. A rear end portion of a barrel is fixed to a central area of the front plate. A rear end portion of a screw is supported by the intermediate plate with a bearing in between. A ball screw is incorporated in the rear plate and a forward end of a threaded rod of the ball screw is fixed to a central area of a back surface of the intermediate plate through a load cell.

Injection unit of injection molding machine

An injection molding apparatus comprises a cell assembly that has a tiered frame. The tiered frame is provided with lower unit storage sections and upper unit storage sections. The lower unit storage sections are provided with holders, individually, and injection molding machine units are mounted on the holders, individually. The upper unit storage sections are provided with holders, individually, and injection molding machine units are mounted on the holders, individually. Material supply pipes, temperature control piping, etc. of the injection molding machine units are arranged in a layout space on the side of a back portion of the cell assembly.

Injection molding apparatus

An injection unit including a heating barrel and an injection screw rotationally and axially movable and placed in the heating barrel is disposed on one side of a clamping mechanism for clamping a mold. The injection screw is driven and controlled for operation through a ball screw by an electric motor. Products, each of a moving speed of the ball screw and an operating current supplied to the electric motor in a unit time, are accumulated to calculate a total energy value indicating the amount of total energy supplied to the ball screw. A life energy value is predetermined on the basis of products, each of force generated by the ball screw and a moving speed of the ball screw. It is decided that a life of the ball screw has terminated when the total energy value A is equal to or greater than the life energy B (A&gE;B).

Method of estimating a life of ball screw included in electric injection molding machine and life estimating system

The duty of a current to be supplied to an injection motor is calculated on the basis of the ratio between set injection time for which the injection motor operates and molding cycle time, a shaft torque of the injection motor is calculated on the basis of a set maximum injection force of the injection molding condition, a maximum current for the injection motor is determined on the basis of the calculated shaft torque, and it is decided that the injection motor is overloaded, an alarm is given, a duty for a current that enables continuous molding is retrieved for the maximum current, a state that enables continuous molding is displayed and the molding cycle time determining the duty of the current that enables continuous molding is corrected when the current having the calculated desired duty is smaller than the maximum current.

Motor control method for injection molding machine and motor controller

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Shizuoka-ken, Japan

Fumiyuki Katoh