Forming method of chalcogenide glass aspherical lens

Abstract

A forming method of a chalcogenide glass aspherical lens is disclosed. The method includes: a) subjecting a chalcogenide glass prefabricated part to three times of heating in a preheating device to raise the temperature of the prefabricated part from room temperature to a temperature T1, with the temperature T1 being near the yield temperature At of the material; b) maintaining the temperature of a cavity and a core at T2 under the actions of heating elements, with the temperature T2 being 5-10 DEG C lower than the conversion temperature Tg of the material, transferring the prefabricated part having the temperature T1 into a mould pressing cavity formed by the cavity and the core; maintaining the temperature of the prefabricated part to be around the yield temperature At of the material, and applying a pressing force P1 on to the cavity and the core simultaneously for a time period of t1 to allow the prefabricated part to be turned into the chalcogenide glass aspherical lens by mould pressing; c) maintaining the pressing force P1 for a time period of t2, and cooling the temperature of the forming mould and the chalcogenide glass aspherical lens to a temperature T3; d) transferring the chalcogenide glass aspherical lens to a cooling bath, performing three times of cooling to cool the chalcogenide glass aspherical lens from the temperature T3 to room temperature, and taking the chalcogenide glass aspherical lens out; and e) putting the chalcogenide glass aspherical lens into a tempering device and tempering for 12-36 h.

Description

technical field [0001] The invention belongs to the technical field of lens manufacturing, and relates to a forming and manufacturing method for a chalcogenide glass aspheric infrared optical lens, in particular to a chalcogenide glass aspheric infrared optical lens. The steps of preheating, molding, annealing, and tertiary cooling are carried out in parallel, and the preheating temperature, molding temperature, molding pressure, and cooling temperature of the preform are controlled respectively. The cemented carbide forming die has a small temperature change during the forming process, and is used to manufacture high-precision, high-quality glass spherical and aspherical surfaces. By adopting the forming manufacturing method of the invention, the mass production efficiency and forming consistency of the aspheric lens can be improved, thereby increasing the economic benefit of the product. Background technique [0002] The existing manufacturing methods of aspheric lenses a...

AI Technical Summary

Problems solved by technology

However, this method makes the temperature of the mold change greatly during the molding cycle, and the service life and precision of the mold are affected

Images