Papers by Keyword: Mold Temperature Control

Abstract: In this paper, an induction heating system was applied to the heating stage in the injection molding process. Through simulation and experiment, the heating process was estimated by the temperature distribution and the heating rate. In the simulation, the mold temperature was increased from 30°C to 180°C in 9 s. Therefore, the heating rate was higher than 16°C/s, which represents a positive result in the field of mold heating. Additionally, the temperature distribution revealed that the higher temperature is concentrated on the gate area, while the outside of the mold cavity is at a lower temperature. The same parameters were applied to both the experiment and the simulation, and the results were in good agreement.

Abstract: Gas-assisted mold temperature control (GMTC) is a new technique in the field of mold temperature control. It enables rapid heating and cooling of the cavity surface during the injection molding process. In general, the goals of mold temperature control are to increase the mold surface to the target temperature before filling of the melt and to cool the melt to the ejection temperature. In this paper, dynamic mold temperature control is used for a thin-walled molding part as the temperature distribution and the heating rate are observed. The heating step of DMTC is achieved via hot-air flow directly to the thin-walled area. The results show that the heating rate reached 7.0 °C/s and that the temperature of the mold surface increased from 25 °C to greater than 165 °C within 20 s. A comparison showed that the difference between the simulation and experiment temperatures was less than 5.0 °C. Thus, this method can be used to accurately predict the outcome of a heating step before the actual process is carried out.