Injection molding apparatus and method

A method executed by an injection molding apparatus that includes

• a plasticizing portion producing a plasticized material by plasticizing a material,
• a measurement injection portion that is disposed between the plasticizing portion and a molding mold, measures the plasticized material, and injects the measured plasticized material into the molding mold,
• a first drive portion changing a relative position between the plasticizing portion and the measurement injection portion, and
• a pressure detection portion for detecting a pressure inside the measurement injection portion, in which
• the measurement injection portion is configured such that a volume of a space thereof, in which the plasticized material is stored, changes according to a change in the relative position between the measurement injection portion and the plasticizing portion, the method comprising:
• a measurement step of causing the measurement injection portion to measure the plasticized material by controlling the first drive portion to move the plasticizing portion and the measurement injection portion in a direction away from each other;
• and
• an injection step of injecting the measured plasticized material into the molding mold by controlling the first drive portion to move the plasticizing portion and the measurement injection portion in a direction approaching each other, wherein
• at least one of the measurement step and the injection step is executed depending on the pressure;
• wherein a control portion controls a relative movement speed between the plasticizing portion and the measurement injection portion depending on the pressure.