Construction of a Demolding Force Measurement System in Injection Molding and Its Verification Experiment

Abstract

In this research, a measurement system was established to simultaneously measure the demolding force, the mold temperature and the mold pressure when releasing a molded product from the core of an injection mold. By using this system, experiments were carried out to find the relationship among the demolding force, the mold temperature and the internal pressure of the mold. Further, detailed analysis of the demolding force waveforms was performed to examine the phenomenological meaning of the time historical transition in waveforms. As the result, the demolding force was derived from the measured force waveform, based on the relationship between the mold motion and the measured force signal during releasing. By examining the demolding force, mold temperature and pressure, it was found that the demolding force is greatly influenced by the mold temperature, and the relationship with the mold internal pressure was also clarified.