An injection molding machine includes a cylinder that accommodates a molten resin, a discharging nozzle, a piston that discharges the molten resin from the discharging nozzle, and one or more processors configured to execute the following functions. The functions include calculating a target pressure at which a flow rate of the molten resin discharged from the discharging nozzle becomes an indicated flow rate, controlling a pressure of the molten resin in the cylinder such that the pressure becomes the target pressure, acquiring a temperature of the molten resin in the cylinder, and acquiring a pseudo-plastic viscosity corresponding to the temperature of the molten resin. The target pressure is calculated based on the indicated flow rate, the temperature of the molten resin, the pseudo-plastic viscosity, and the size of the discharging nozzle.

An injection molding machine includes a cylinder that accommodates a molten resin, a discharging nozzle, a piston that discharges the molten resin from the discharging nozzle, and one or more processors configured to execute the following functions. The functions include calculating a target pressure at which a flow rate of the molten resin discharged from the discharging nozzle becomes an indicated flow rate, controlling a pressure of the molten resin in the cylinder such that the pressure becomes the target pressure, acquiring a temperature of the molten resin in the cylinder, and acquiring a pseudo-plastic viscosity corresponding to the temperature of the molten resin. The target pressure is calculated based on the indicated flow rate, the temperature of the molten resin, the pseudo-plastic viscosity, and the size of the discharging nozzle.

An injection molding machine includes a first cylinder to which a molding material is supplied; a first injection member provided in the first cylinder, the first injection member being configured to advance and retract; a second cylinder to which the molding material extruded from the first cylinder is supplied; a second injection member provided in the second cylinder, the second injection member being configured to advance and retract; and circuitry configured to control operations of the first injection member and the second injection member, wherein the circuitry controls a measuring step for supplying the molding material to the second cylinder by advancing the first injection member, and wherein the circuitry retracts the second injection member in accordance with the advancing of the first injection member in the measuring step.

Provided are a dual injection system and a synchronization control method thereof. The system includes a primary injection system and a secondary injection system, where the primary injection system and the secondary injection system each include a speed injection oil circuit and a booster oil circuit; the speed injection oil circuit of the primary injection system and the speed injection oil circuit of the secondary injection system are arranged independently of each other; and the booster oil circuit of the primary injection system and the booster oil circuit of the secondary injection system each include an A-bridge valve group and are arranged in coordination with each other. The method is configured to perform a synchronization control on the primary injection system and the secondary injection system of the system.

Provided are a dual injection system and a synchronization control method thereof. The system includes a primary injection system and a secondary injection system, where the primary injection system and the secondary injection system each include a speed injection oil circuit and a booster oil circuit; the speed injection oil circuit of the primary injection system and the speed injection oil circuit of the secondary injection system are arranged independently of each other; and the booster oil circuit of the primary injection system and the booster oil circuit of the secondary injection system each include an A-bridge valve group and are arranged in coordination with each other. The method is configured to perform a synchronization control on the primary injection system and the secondary injection system of the system.