Injection molding machine and mold thickness control method

An injection molding machine comprising:

• a fixed platen on which a fixed mold is mounted;
• a moveable platen disposed facing the fixed platen and installed moveably forward and backward by a toggle link, the moveable platen on which a moveable mold is mounted facing the fixed mold;
• a base plate supporting the toggle link and installed moveably forward and backward;
• a driving part for mold clamping to operate the toggle link;
• a driving part for mold thickness adjustment to adjust a mold thickness by moving the base plate forward and backward in relation to the fixed platen;
• and
• a control unit to calculate a movement distance gap′before a clamping process by controlling the driving part for mold thickness adjustment to move the base plate backward and then move the base plate forward to a target movement position based on a fold amount of the toggle link determined by a clamp force, and control the driving part for mold thickness adjustment using a value obtained by deducting the movement distance gap from the fold amount of the toggle link when producing a clamp force.