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.

An injection molding machine includes: a first driving device rotating a screw provided inside a heating cylinder; a second driving device moving the screw forward and backward; a metering control section configured to, by controlling the first driving device and the second driving device, to meter resin while melting the resin, and thereafter rotate the screw in reverse to thereby reduce the pressure of the resin; a first sensor unit for detecting the pressure; a second sensor unit for detecting one or more kinds of physical quantities that affect the change of the pressure; and a prediction section predicting decompressing rotation information based on the pressure detected by the first sensor unit and the one or more kinds of physical quantities detected by the second sensor unit. The metering control section controls the first driving device based on the decompressing rotation information predicted by the prediction section.

There are provided an apparatus for taking out a molded product that allows a physical amount such as the mass of the taking portion to be easily acquired with a relatively simple configuration. A posture reversing mechanism is provided between the elevating arm and the taking portion to change the direction of the taking portion between an unreversed state in which the taking portion is directed to be able to take hold of the molded product molded in the die, and a reversed state in which the length of the taking portion in the vertical direction is shorter than that in the unreversed state. A sensor detects vibration of the elevating arm. A mass estimating section estimates the mass of the taking portion on the basis of vibration of the elevating arm detected by the sensor when the taking portion is in the reversed state.

The present disclosure prevents load from being produced in an injection molding machine. The control device for an injection molding machine according to one embodiment of the present disclosure has a determining part that is configured to determine, based on information detected in accordance with a movement of a measurement motor provided in the injection molding machine, whether or not an operation of removing or attaching a screw that rotates in accordance with the measurement motor has been performed.

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 technique for providing assistance in setting the time to increase the clamping force is provided. A control device of an injection molding machine includes a clamping control part and a monitoring part. The clamping control part is configured to change, in a filling step of filling the inside of a mold device with a molding material during clamping, a set value of clamping force from a first set value to a second set value that is larger than the first set value, at a predetermined pressurizing timing in the middle of the filling step. The monitoring part is configured to monitor changes in the actual value of the clamping force due to changes in the set value of the clamping force.

An injection molding system includes: a first extruding member that extrudes a first molded article from a mold; a robot that transfers the first molded article extruded from the mold to an assembling position in relation to a second molded article in the mold; a second extruding member that extrudes the second molded article from the mold towards the first molded article retained at the assembling position by way of the robot, and assembles the second molded article to the first molded article; and a load detection unit that detects load applied to the second extruding member, in which defect discrimination of the first molded article, the second molded article, or an assembled state of the first molded article and the second molded article is performed, based on load detected by the load detection unit when the second molded article is assembled to the first molded article.

A system, method and apparatus for controlling an injection unit to transfer a material to a mold cavity includes a first actuator and a second actuator, and a controller that is operatively connected to the first actuator and the second actuator. The first and second actuators are coupled to a ram of the injection unit. The first actuator rotates the ram within the barrel, and the second actuator translates the ram within the barrel. During a material fill stage of an injection cycle, the controller controls the first actuator to rotate the ram within the barrel. The controller also controls the second actuator to translate the ram within the barrel, and controls the second actuator to retract the ram away from a nozzle of the injection unit while exerting a compression force on the ram towards the nozzle.

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.

A molding machine includes: a mold that forms a molded product; an extrusion pin that transmits to the molded product an extrusion force for demolding the molded product from the mold, wherein the extrusion pin is inserted in the mold; and a control device configured to control the extrusion force of the extrusion pin. The control device controls the extrusion force at a first timing elapsed a first elapsed period so as to be greater than the extrusion force at second timing elapsed a second elapsed period. The first elapsed period is an elapsed period from a predetermined start point. The second period is an elapsed period from the start point and a shorter than the first elapsed period.