Patent ID: 11945148
Assignee: FANUC CORPORATION
Field: Other special machines (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. An injection molding machine comprising:
a stationary platen configured to hold a fixed mold;
a rear platen;
a tie bar configured to connect the stationary platen and the rear platen to each other;
a movable platen that is disposed between the stationary platen and the rear platen and is configured to hold a movable mold in a manner that the movable mold faces the fixed mold and further configured to be movable along the tie bar;
a mold clamping mechanism configured to generate a mold clamping force between the fixed mold and the movable mold by moving the movable platen toward the stationary platen and bringing the fixed mold and the movable mold into contact with each other;
a drive source configured to drive the mold clamping mechanism;
a mold clamping force detection unit configured to detect the mold clamping force;
an elongation value detection unit configured to detect an elongation value indicating an elongation amount of the tie bar that is elongated as a result of generation of the mold clamping force; and
an abnormality determination unit configured to determine whether there is an abnormality in the injection molding machine, based on a ratio between the mold clamping force detected by the mold clamping force detection unit and the elongation value detected by the elongation value detection unit after the fixed mold and the movable mold are brought into contact with each other.