System and method for monitoring injection molding process

A method for monitoring an injection molding process, the method comprising:

• fastening a sensor module on one side of a mold by bolts, and measuring a vibration signal generated by the mold during the injection molding process, wherein the sensor module is coupled to the mold via a transfer medium made of a same material as the mold to minimize distortion and attenuation of the vibration signal;
• receiving, at a controller, the vibration signal of the mold measured by the sensor module and controlling the sensor module;
• and
• obtaining, by the controller, a signal of which the amplitude is greater than or equal to a set value from the vibration signal of the mold measured by the sensor module, and calculating a time between the obtained signals,
• wherein the vibration signal is divided into an injection start cycle time, a V/P switchover cycle time, and a packing end cycle time,
• wherein, in order to monitor the injection molding process, the controller defines for each of the cycle times a representative value based on a median value of the amplitude of the vibration signal within the cycle time, determines an injection time as a difference between an injection start time and a V/P switchover time, and determines a packing time as a difference between a packing end time and the V/P switchover time, compares the injection time and the packing time with actual cycle times recorded during the molding process, evaluates whether deviations between the calculated times and the machine-recorded times satisfy preset monitoring conditions, and outputs a monitoring result indicating a state of quality and reliability of the molding process,
• wherein the vibration signal detected in each of the cycle times is transmitted to the controller, and
• wherein the controller further analyzes the obtained signals according to a predetermined rule to determine the injection time, the packing time, and the cycle times of the injection molding process.