X. Wang, P. Xie, P. Zhang, Y. Ding, W. Yang
August 22, 2013
A differential molding system for micro injection molding of thermoplastics was designed and fabricated. As the core part, a planetary gear pump was integrated into the molding module and used for metering, delivering and supercharging. The molding system was installed in the stationary platen beside which a servo motor was connected to the transmission shaft of the pump through a coupling. A traditional injection molding machine which was equipped with this module could be upgraded to a precise micro injection molding machine and realized the function of multiple micro injection molding machines. A process study was first performed to verify the machine performance and to determine the influence of the main process parameters. It has been proved by experiments that the differential molding system could realize the manufacture of fine and precision parts with micro structures in one step with high efficiency at low cost.