Fig. 1. Sixth-order generalized Maxwell model

Fig. 2. Schematic diagram of the simple thermo-rheological properties of glass

Fig. 3. Schematic diagram of the compound eye and boundary conditions of the finite element model.(a) Schematic diagram of the lower mold compound eye structure；(b) model boundary conditions

Fig. 4. Molding simulation results. (a) Diagram; (b) stress distribution for lens sections

Fig. 5. Stress-temperature curves for different molding conditions. (a) Stress in each sub-eye for different temperatures at constant molding velocity; (b) stress in each sub-eye for different temperatures at constant molding pressure

Fig. 6. Molding process parameters-temperature curves for different molding conditions. (a) External forces-time curves for different temperatures at 10 μm/s molding velocity; (b) displacement-time curves for different temperatures at 1.5 MPa molding pressure

Fig. 7. Comparative curves of the stress change process under two molding conditions. (a) Stress-time curves for two molding conditions; (b) stress-displacement curves for two molding conditions

Fig. 8. Stress in each sub-eye at different molding velocities

Fig. 9. External force-time curves for different molding velocities. (a) External force-time curves; (b) external force-displacement curves

Fig. 10. Effects of different mold pressures on the stress of each sub-eye. (a) Stress in each sub-eye; (b) displacement-time curves

Fig. 11. Results curves of holding phase. (a) Position of the upper mold-time curves; (b) maximum stress-time curves