Control device for injection molding machine

A control device for controlling an injection molding machine, the control device comprising:

• a mold device having a fixed mold and a movable mold;
• a mold clamping device configured to open and close the fixed mold and the movable mold;
• an injection device configured to inject a molding material into the mold device;
• and
• circuitry configured to
• acquire an allowable amount as a size of a gap allowable between the fixed mold and the movable mold for preventing discharge of the molding material from the mold device when the molding material is injected into the mold device, and acquire a gap size indicating a size of a gap provided for discharging a gas between the fixed mold and the movable mold, and
• adjust a mold clamping force of the mold clamping device such that a value obtained based on an opening size and the gap size satisfies a condition according to the allowable amount when the molding material is injected into the mold device closed by the mold clamping device, the opening size indicating a size of a gap between the fixed mold and the movable mold generated by injection of the molding material.