Sumitomo Heavy Industries, Ltd.

Yoshiyuki Imatomi

Kazuo Hiraoka

Hitoshi Hara

Atsushi Ishikawa

Tomohiro Hirano

Tatsuro Araki

Yoshihiko Nagata

A mold includes a mold insert body made of at least two kinds of materials. The materials have different coefficients of thermal conductivity. The mold insert body includes a union part formed by sintering the materials, and the union part has a configuration set so as to correspond to a cooling way of a molding material flowed in a cavity forming part of the mold.

Mold and a method for manufacturing the same

A method and apparatus for adjusting a zero point of a pressure sensor of an injection apparatus, which method and apparatus enable precise zero-point adjustment for the pressure sensor. Pressure of resin is detected by use of the pressure sensor, while a screw is moved, and a detection value corresponding to a detected pressure is obtained. The zero point of the pressure sensor is adjusted on the basis of the detection value. The detection value is obtained when the screw is moved in a state in which a flight speed is rendered lower than a screw speed. In this case, since the frictional resistance which acts on resin in the vicinity of the inner circumferential surface of the heating cylinder upon movement of the screw can be decreased, loads stemming from the frictional resistance are prevented from serving as disturbance against the detection value. As a result, zero-point adjustment for the pressure sensor can be performed precisely.

Method and apparatus for adjusting zero point of a pressure sensor of an injection apparatus

An injection apparatus which can reduce frictional resistance which acts on resin during an injection step to thereby prevent variation in a reference position and improve quality of molded products. The injection apparatus comprises a heating cylinder; a screw disposed within the heating cylinder to be rotatable and reciprocatable, the screw having a flight portion in which a flight is formed on an outer circumference of a screw body, and a screw head disposed at a front end of the flight portion; a first drive unit for rotating the screw; a second drive unit for advancing and retracting the screw; a screw-advancement control unit for driving the second drive unit in an injection step in order to advance the screw at a predetermined screw speed; and a flight speed control unit for driving the first drive unit in the injection step in order to advance the flight at a flight speed that is apparently lower than the screw speed. Since the frictional resistance acting on resin in the vicinity of the inner circumferential surface of the heating cylinder can be reduced, during the injection step, the injection force can be made to correspond to the injection pressure, so that a sufficiently large injection pressure can be generated.

Injection apparatus and method of controlling the same

In an injection molding machine which comprises a mold composed of a fixed mold attached to a fixed platen and a movable mold attached to a movable platen, and a driving source for driving the movable platen to open and close the mold, a distance sensor detects, as a platen interval, a distance between two positions preliminarily selected on the fixed platen and the movable platen and produces a distance detection signal. A pressure sensor detects a clamping pressure applied by the driving source and produces a pressure detection signal. A control unit controls the driving source to adjust the platen interval and the clamping pressure through a plurality of steps in response to the distance detection signal and the pressure detection signal.

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Tomisato, Japan

Yoshiyuki Imatomi