Patent ID: 8460586

Claim:
An injection molding device, comprising: a mold having a cavity; an injection section, that has an injection screw displaceably configured to fill a molten resin into the cavity by the forward movement, and that performs a plurality of injection operations including at least a filling operation and a pressure keeping operation by displacing the injection screw; a position sensor that detects a screw position which is a position of the injection screw; a temperature sensor that can measure a temperature in the vicinity of the cavity of the mold; a temperature adjustment section that can adjust a mold temperature by heating or cooling the mold; a control section that controls a displacement of the injection screw and the mold temperature, and determines a plurality of switching timings including a beginning of injection and a change in injection speed during injection process in the injection operations on the basis of the screw position; and, a display unit that displays an image on the basis of a command from the control section; wherein the control section creates a waveform diagram of the temperature in the vicinity of the cavity on the basis of input from the temperature sensor so as to correspond to a predetermined variation, and has the display unit display a first correlation diagram showing at least the change in injection speed of the determined plurality of switching timings during the injection process of the injection operations in the waveform diagram of the temperature.