Fanuc Corporation

Kodai Nanri

Junpei Maruyama

Kazuyoshi Tanaka

Satoshi Yano

An injection molding machine includes a screw inserted in an injection cylinder and configured to be movable in an axial direction of the screw, a motor configured to move the screw, a torque detection unit configured to detect a torque of the motor, a position detection unit configured to detect a position of the screw, a motor drive control unit configured to drive the motor to thereby advance the screw to a foremost position in a direction of injection, a processor, and a memory. The processor and memory are configured to determine that unmelted resin remains inside the injection cylinder if the torque of the motor becomes equal to or greater than a limit torque while the screw is advancing to the foremost position.

Injection molding machine and screw control method for injection molding machine

An injection molding machine includes: a screw inserted in an injection cylinder and configured to be movable in the axial direction; a motor configured to move the screw; a torque detection unit configured to detect the torque of the motor; a position detection unit configured to detect the position of the screw; a motor drive control unit configured to drive the motor while imposing torque limitation so that the motor's torque will not exceed a limit torque, to thereby advance the screw to the foremost position in the direction of injection; and a determination unit configured to determine that unmelted resin remains inside the injection cylinder if the moving speed of the screw becomes lower than or equal to a predetermined speed while the screw is advancing to the foremost position.

A phase adjusting device includes: a torque acquisition unit acquiring a torque; a position acquisition unit acquiring the rotational position of the first motor; a first motor control unit rotating the first motor in a first rotational direction until the torque exceeds a threshold, and then in a second rotational direction until the torque exceeds the threshold again; a storage control unit storing, in a storage unit, a first rotational position when the first motor is rotated in the first rotational direction and the torque exceeds the threshold and a second rotational position when the first motor is rotated in the second rotational direction and the torque exceeds the threshold again; a phase position calculator calculating a third rotational position, based on the first and second rotational positions; and a second motor control unit rotating the first motor to the third rotational position.

Phase adjusting device and phase adjusting method

A controller of an injection molding machine controls mold clamping of a fixed mold and a movable mold. The controller includes a servomotor drive control unit for limiting increase in driving current during driving of a mold clamping servomotor, and a moving state acquisition unit that acquires a detection signal of an encoder. The controller further includes an abnormality determination processing unit for determining that a clamping force sensor is abnormal when recognizing stoppage of movement of the movable mold during mold clamping, based on the acquired detection signal of the encoder.

Growing community of inventors

Yamanashi, Japan

Kodai Nanri