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Optimization on the general molds design method for precision glass molding

Precision glass molding (PGM) technology provides a possibility of rapidly manufacturing optical lenses with large volume, high precision, and complex shapes. It is difficult to fabricate micrometer-level structures in common PGM mold materials like tungsten carbide (WC) using a grinding/polishing approach. But no literature has pointed out how to design the dimensional tolerance of molds to ensure the molding accuracy in the case of the molds working in a temperature range of several hundreds of degrees Celsius. In this paper, a theoretical model is established based on the general molds designed sizes. The finite element method (FEM) and the PGM experiments were carried out. The measuring results of the decenter and tilt of the molded lens indicated that the optimization was effective and could be applied to other PGM experiments.