Prediction of Profile Deviation during Glass Molding of Double-Aspheric Lens
Journal of Engineering Science and Technology Review
Glass molding technology has attracted considerable attention because of its low cost and high-volume production. However, the profile deviation mechanism of double-aspheric lens is currently unclear. A method of profile deviation prediction was developed in this study to reveal the influence law of molding parameters on the profile deviation of upper and lower aspheric surfaces. Based on the thermoviscoelastic constitutive model and finite element theory, a method of profile deviation
... n for the glass molding of double-aspheric lens was established. Single-factor analysis method was used to analyse the influence law of glass molding parameters, such as molding temperature, molding velocity, annealing rate, and holding pressure on profile deviation. Different influence laws of each molding parameter on the profile deviation of the upper and lower aspheric surfaces were discussed. Results demonstrate that the profile deviation decreases with the increase when the molding temperature lower than 570 °C. When the molding temperature is above 570 °C, the profile deviation slowly increases with the increase of molding temperature, and the profile deviation of the double-aspheric lens increases with the increase in the pressing velocity. The profile deviation of the upper and lower aspheric surface decreases as the annealing rate and the holding pressure increase, and the profile deviation of the upper surface is greater than the lower. The difference can be reduced by increasing the holding pressure. This study provides a reference for improving the molding accuracy of double-aspheric lens.