Ultrasonic vibration anti-sticking method for compression molding of glass optical element

Abstract

The invention discloses an ultrasonic vibration anti-sticking method for compression molding of a glass optical element. During working, a heating furnace softens a glass preform to a viscoelastic state; meanwhile, an ultrasonic vibration system drives the bracket to perform high-frequency vibration, and ultrasonic frequency pulse force or sine force is applied to the contact surface of the glass preform, so that the viscoelastic glass shows the attribute tending to an ideal elastic solid under high frequency, the effective contact time of the glass and the bracket is shortened, and therefore, the high-temperature contact characteristic between the glass and the bracket is improved, and the optical glass preform is prevented from being bonded with the bracket in the heating and softening process.

Description

technical field [0001] The invention belongs to the field of glass processing, and in particular relates to an ultrasonic vibration anti-adhesion method for molding glass optical elements. Background technique [0002] The traditional optical glass lens precision molding process is heat softening, molding, annealing, and cooling. Optical glass blocks are used as raw materials. The entire heating, softening, molding, annealing, and cooling processes are all carried out in the mold. Contact, the two materials of glass and mold at high temperature are prone to element diffusion and chemical bond formation at the contact interface, resulting in the pressed glass lens often sticking to the mold, affecting the molding quality and molding efficiency, for example, in a single station In the isothermal precision molding machine, the molding process of each optical lens takes more than 15 to 30 minutes, and the mold needs to be heated and cooled repeatedly, resulting in serious energy...

AI Technical Summary

Problems solved by technology

However, there are still many problems in the heating and softening process of optical glass raw materials. The key problem is that the glass is easy to bond with the tray during the softening process. If a large amount of water or air is introduced into the space where the bracket is located, the bracket can be made Keeping a lower temperature, such as 80°C, can prevent the glass from bonding to the support during the softening process, but the temperature of the contact between the glass and the support is too low, resulting in incomplete softening of the glass preform and incompletely softened glass Molding will directly damage the mold, and a large amount of water flow or air flow into the bracket will also take away a considerable part of the heat in the furnace body, which cannot achieve the effect of energy saving

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