AN EXPERIMENTAL STUDY OF THE VARIABLE-RUNNER SYSTEM

摘要

Although the family-mold has an advantage to reduce the cost, molding defects frequently occur by an excessive packing the smaller-volume cavity, especially when the two cavities have a large volumetric difference. In this study, we developed a variable-runner system for the filling balance of the cavities by changing the cross-sectional area of a runner. We applied the variable-runner system to the cavities having filling imbalance, and achieved a fair filling balance. The filling balance was checked with the temperature and pressure sensors in the cavity. We also examined the influence of the injection speed to the balancing capability of the variable-runner system.