Ultrasonic vibration anti-adhesion method for molding glass optical components

Abstract

The invention discloses an ultrasonic vibration anti-adhesive method for molding glass optical elements. When working, the heating furnace softens the glass preform to a viscoelastic state; at the same time, the ultrasonic vibration system drives the bracket to vibrate at high frequency, and applies ultrasonic pulse force or sinusoidal force to the contact surface of the glass preform to make the viscoelastic state The glass exhibits the properties of an ideal elastic solid at high frequencies, and reduces the effective contact time between the glass and the support, thereby improving the high-temperature contact characteristics between the glass and the support, and preventing the optical glass preform from occurring with the support during heating and softening. bonding.

Description

technical field [0001] The invention belongs to the field of glass processing, and in particular relates to an ultrasonic vibration anti-sticking method for molding glass optical elements. Background technique [0002] The traditional precision molding process of optical glass lens is heating and softening, molding, annealing and cooling. Optical glass blocks are used as raw materials. The entire heating and softening, molding, annealing and cooling processes are all carried out in the mold. Contact, the two materials of glass and mold are prone to element diffusion and chemical bond formation at the contact interface at high temperature, 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 ser...

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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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