A motor core manufacturing device of the present disclosure includes a mold that holds a motor core including a resin fill section, a chamber that is formed to the mold and that includes a one-end portion thereof communicating with a resin composition fill path in communication with the resin fill section, a plunger that conveys a resin composition with thermoset properties that has been conveyed to the chamber toward the resin composition fill path, a heating apparatus that is arranged inside the mold, or that is arranged inside the mold and at a periphery of the chamber, and an extrusion machine that conveys the resin composition to the chamber while kneading so as to introduce the resin composition into the chamber. The extrusion machine includes an extrusion conveyance path in an interior for conveying the resin composition, a screw that is arranged inside the extrusion conveyance path, and that conveys the resin composition while kneading, and a first thermoregulation mechanism that is arranged at least in part of the interior of the screw.

An injection device of an injection molding machine includes an injection cylinder, a plunger, and a seal cylinder. The seal cylinder has a seal surface facing the plunger, a front surface forming a front surface flow path, and an outer side surface forming a side surface flow path. Between the injection cylinder and a side surface of the plunger, a first clearance is provided which is a gap that allows a molding material to flow through. Between the seal surface and the side surface of the plunger, a second clearance is provided which is a gap smaller than the first clearance and is reducible by a pressure of the molding material generated during dwelling.

An injection device of an injection molding machine includes an injection cylinder, a plunger, and a seal cylinder. The seal cylinder has a seal surface facing the plunger, a front surface forming a front surface flow path, and an outer side surface forming a side surface flow path. Between the injection cylinder and a side surface of the plunger, a first clearance is provided which is a gap that allows a molding material to flow through. Between the seal surface and the side surface of the plunger, a second clearance is provided which is a gap smaller than the first clearance and is reducible by a pressure of the molding material generated during dwelling.

A thermosetting composition for injection molding comprising: (A) a compound represented by the following formula (A2) or (A3), and (B) a thermal polymerization initiator; wherein the composition further comprises no (G) titanium oxide or comprises (G) titanium oxide, when the composition comprises the component (G), the content of the component (G) is 5 parts by mass or less, based on a total of 100 parts by mass of components other than the component (B) and the component (C); and the composition comprises no polybutadiene di(meth)acrylate: ##STR00001##

A plasticizing device includes a flat screw including a groove forming surface in which a groove is formed, a barrel having a facing surface and a communication hole formed in the facing surface, the communication hole allowing a plasticized material to flow out, a heating unit, a flow path through which the plasticized material flows, a nozzle communicating with the flow path, a plurality of measurement units configured to measure pressures or temperatures in the flow path, an aspiration delivery unit, including a cylinder, having a branch flow path and a plunger configured to move in the cylinder so as to aspirate the plasticized material into the branch flow path or deliver the aspirated plasticized material to the nozzle, and a control unit configured to identify a state of the plasticized material in the flow path based on measurement values of the measurement units.

A plasticizing device includes a flat screw including a groove forming surface in which a groove is formed, a barrel having a facing surface and a communication hole formed in the facing surface, the communication hole allowing a plasticized material to flow out, a heating unit, a flow path through which the plasticized material flows, a nozzle communicating with the flow path, a plurality of measurement units configured to measure pressures or temperatures in the flow path, an aspiration delivery unit, including a cylinder, having a branch flow path and a plunger configured to move in the cylinder so as to aspirate the plasticized material into the branch flow path or deliver the aspirated plasticized material to the nozzle, and a control unit configured to identify a state of the plasticized material in the flow path based on measurement values of the measurement units.

An injection molding machine heats an injection nozzle using, as a target temperature, a detected temperature of a synchronization zone, when a detected temperature of the injection nozzle is lower than a nozzle reference temperature. The injection molding machine heats the injection nozzle using a nozzle set temperature as a target temperature, when a detected temperature of the injection nozzle is higher than the nozzle reference temperature.

An injection molding machine heats an injection nozzle using, as a target temperature, a detected temperature of a synchronization zone, when a detected temperature of the injection nozzle is lower than a nozzle reference temperature. The injection molding machine heats the injection nozzle using a nozzle set temperature as a target temperature, when a detected temperature of the injection nozzle is higher than the nozzle reference temperature.