In the injection molding industry, the increase in automation equipment is a very important process control items. "Mold opening stroke" is an important item for appearance and functional quality when molding plastic products. In this study, the shrinkage speed (v) of the hydraulic closed-loop control method was increased to 20, 50, 80, and 100% to confirm the relationship between them. The following results were obtained through the experiment. It was found that the accuracy and reproducibility were excellent based on the control item of 110 mm, and it was confirmed through the experiment that when the shrinkage speed was set to 50 and 80%, the measuring distance was 110.0 mm, showing the highest accuracy and reproducibility.

• 정현석(Professor, Dept Semiconductor Measurement of Semiconductor Campus KOREA Polytechnics.) | JungHyunSuk Corresponding author
• 이선종 | LeeSunJong