Brake control device for injection molding machine and brake control method for injection molding machine

A brake control method for an injection molding machine that includes a mold opening/closing mechanism configured to open and close a mold and generate mold clamping force, an actuator configured to drive the mold opening/closing mechanism, a power supply unit configured to supply power to the actuator, and a brake mechanism configured to apply braking force to the mold opening/closing mechanism, the method comprising:

• a mold clamping force obtaining step of obtaining mold clamping force information indicating the mold clamping force of the mold opening/closing mechanism;
• a mold clamping force deciding step of determining whether or not the mold clamping force of the mold opening/closing mechanism exceeds a predetermined value, based on the mold clamping force information;
• and
• a brake controlling step of actuating the brake mechanism when the mold clamping force deciding step determines that the mold clamping force of the mold opening/closing mechanism does not exceed the predetermined value and when the power supply unit cuts off the supply of power to the actuator, and not actuating the brake mechanism when the mold clamping force deciding step determines that the mold clamping force of the mold opening/closing mechanism exceeds the predetermined value.