DIE PRESSURE LOSSES DURING INJECTIONMOLDING OF RUBBER MIXES

摘要

In order to fill the mold in a rubber injection molding process, it is necessary to inject the material into the closedmold. Rubber is usually injected under ram speed control, but it can be also injected under pressure control. In the pres-ent study, we have recorded the signals of pressure at three points during the filling of a spiral shape part. The behaviorsof two rubber compounds have been studied using a variety of combinations of process conditions (including mold tem-perature, mass temperature, ram speed and injection molding with and without pressure holding stage). In all conditions,the transducer located in proximity to the gate exhibits pressure decay at the last stage of mold filling. Initial CAE sim-ulations have been carried out using Moldflow software to check the capability of this sort of software to calculate pres-sure decay during the filling stage.