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The injection volume rate is an important setting parameter of the injection moulding process as it determines local process parameters as melt front velocity, respectively, shear rate, pressure and temperature in the mould cavity. In order to avoid too low or too high melt front velocities, profiling of the injection volume rate during the injection is necessary dependent on the part geometry. However, the set-up of a volume rate profile at the machine is an iterative and subjective process so far. Therefore, a method is developed that determines a suitable volume rate profile based on the process simulation gaining a constant melt front velocity or melt front shear rate. A developed process model enables the transmission from simulation to the machine based on a volume rate balance in the screw antechamber. The simulative and experimental results show a good agreement of the cavity filling.

Development of a methodical approach to set-up the injection velocity profile dependent on the part geometry