Patent ID: 7128854

Claim:
A method for controlling an injection molding machine that performs a molding cycle, the molding cycle including a filling process for controlling an advancing motion of a screw of the injection molding machine, and a hold press process for controlling a pressure of a molten resin after the filling process, the method comprising a step for limiting a retracting speed of the screw to a predetermined retracting speed limit value after a pressure control in the hold press process begins, wherein the retracting speed of the screw is detected, so that a first operation amount based on a first difference that is the difference between the retracting speed that is detected and the retracting speed limit value is calculated, wherein a hold press pressure that is a resin pressure in the hold press process is detected, so that a second operation amount based on a second difference that is the difference between the hold press pressure that is detected and a hold press pressure preset value is calculated, wherein the retracting speed of the screw is controlled based on the first operation amount when the first operation amount is greater than the second operation amount, and wherein the pressure control is performed based on the second operation amount when the first operation amount is equal to or less than the second operation amount.