Machining method of glass preform

Abstract

The invention provides a machining method of a glass preform. The machining method of the glass preform comprises the following steps of heating a glass clinker till the glass clinker is changed intoviscous flow state molten glass; injecting the viscous flow state molten glass into a forming mould; using the forming mould to press the viscous flow state molten glass and cooling the pressed viscous flow state molten glass to a temperature below a softening point temperature so as to form a preform; taking out the preform from the forming mould; and annealing the preform. The machining method of the glass preform, provided by the invention, has the advantages that the glass clinker is heated to form the viscous flow state molten glass and then injected into the forming mould to be pressurized to form the preform; as the temperature of the glass clinker while the glass clinker is injected into the forming mold is higher than the softening point temperature, the glass clinker still possesses very good deformation performance while being injected into the forming mould; in the forming mould pressurizing process, the viscous flow state molten glass is changed into the shape of the preform with the mould pressure without a cracking problem caused when the internal temperature of the viscous flow state molten glass does not reach the softening point; and under a situation that the viscous flow state molten glass is enough, a problem of incomplete mould filling cannot be caused.

Description

technical field [0001] This application relates to the technical field of optical devices, in particular to a processing method for glass preforms Background technique [0002] Optical glass components used in various optical devices are mostly high-precision parts, which need to be obtained by finishing methods. In order to reduce the processing cost, preforms are manufactured first during the production of optical glass components, and then the preforms are finished. [0003] Existing processing methods for glass preforms include mechanical processing methods and secondary hot-press forming methods; traditional mechanical processing methods are gradually eliminated due to complex processing procedures and low efficiency, and secondary hot-press forming methods are mainly used in the industry. The secondary hot pressing method is to heat up the glass blank according to the size and shape requirements of the preform, heat the glass blank to the softening point temperature a...

AI Technical Summary

Problems solved by technology

[0003] Existing processing methods for glass preforms include mechanical processing and secondary hot-press forming methods; traditional mechanical processing methods are gradually being eliminated due to complex processing procedures and low efficiency, and secondary hot-press forming methods are mainly used in the industry

The secondary hot pressing method is to heat up the glass blank according to the size and shape requirements of the preform, heat the glass blank to the softening point temperature and then perform hot pressing treatment; however, in actual production, because the outer area of ​​the glass blank is heated After reaching the softening point, the internal temperature may not reach the softening point, so the hot-pressing treatment of the glass blank may cause the glass to burst, or the problem of incomplete punching with the glass blank, which in turn leads to a low yield of optical preforms

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