Injection molding machine

An injection molding machine comprising:

• a cylinder that heats a molding material;
• a screw that is rotatably and reciprocatably provided in the cylinder;
• a rotary driving unit that rotates the screw;
• a reciprocation driving unit that reciprocates the screw;
• a pressure detector that detects a pressure of the molding material reserved in front of the screw;
• and
• a control unit that controls the rotary driving unit and the reciprocation driving unit,
• the control unit including a memory that contains a program and a processor that is configured to execute the program so as to perform a method, said method including the steps of:
• performing a first type of plasticizing process by moving the screw in a backward direction to a predetermined position and rotating the screw at the predetermined position to transfer the molding material forward to reserve the molding material in front of the screw while the screw is fixed at the predetermined position,
• performing a first type of filling process by moving the screw forward to inject the molding material reserved in front of the screw to be filled in a mold unit,
• monitoring the pressure in the first type of filling process by the pressure detector, and
• correcting a subsequent setting of the first type of plasticizing process,
• wherein the method further includes, before the first type of plasticizing process and the first type of filling process,
• performing a second type of plasticizing process including the step of moving the screw in a longitudinal direction of the cylinder by rotating the screw to transfer the molding material forward to reserve the molding material in front of the screw while the screw is being moved backward to a predetermined position by the pressure caused by the molding material reserved in front of the screw,
• performing a second type of filling process by moving the screw forward to inject the molding material reserved in front of the screw in the second type of plasticizing process from the cylinder to be filled in the mold unit, and
• monitoring the pressure in the second type of filling process by the pressure detector, and
• wherein the control unit executes the program so as to perform the correcting step of the subsequent setting of the first type of plasticizing process based on a difference between the pressure monitored in the first type of filling process and the pressure monitored in the second type of filling process.