Large-diameter high-precision optical glass forming device and its process

Abstract

The invention provides a molding device and technology for large-caliber high-precision optical glass. The molding device for large-diameter high-precision optical glass includes a molding furnace, a molding elevator, and a molding mold, and also includes a heat preservation cover. The heat preservation cover and the molding furnace are arranged in the upper and lower halves of the molding mold to form a closed cavity. The present invention adds a heat preservation cover to the lower half of the formed glass, and changes the upper half of the formed glass from heating and heat preservation to fully enclosed heating and heat preservation in the past, thereby solving the problem of large heat loss, poor effect, and long forming time during the heating and heat preservation of the forming furnace in the past. 1. The problem that the formed glass is easy to burst; the present invention adopts the large drop material forming, which solves the problem of small size and poor uniformity due to the drawing of the strip material, and the glass will no longer produce a large number of forming bubbles due to the temperature change of the forming furnace, thereby Problems leading to the scrapping of formed glass.

Description

technical field [0001] The invention relates to a molding device and technology for large-caliber high-precision optical glass. Background technique [0002] At present, the molding devices used in molding optical glass are as follows: figure 1 As shown, the forming furnace 1 is heated by carbon rods 2 to insulate and heat the formed glass 4 flowing out of the discharge pipe 3. The forming furnace 1 is arranged above the formed glass 4, but since the bottom of the formed glass 4 has no heat preservation measures, Therefore, when forming large-caliber high-precision optical glass with a refractive index of 1.50-1.53 ​​and an Abbe number of 58-66, especially when the glass size is more than 700mm×700mm×200mm, due to the large steamed bread surface of the formed glass (large steamed bread surface refers to the shape The shape of the glass is not good, the appearance is like the shape of steamed buns), and the molding time exceeds 5 hours, so the molded glass is easy to burst. ...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a molding device and process for large-caliber high-precision optical glass

[0006] The beneficial effects of the present invention are: adding a heat preservation cover to the lower part of the forming glass, changing the heating and heat preservation of the upper part of the forming glass to a fully enclosed heating and heat preservation in the past, thus solving the problem of large heat loss and heat preservation in the past forming furnace heating and heat preservation poor quality, long molding time, and easy cracking of the shaped glass; the present invention adopts large droplet molding, which solves the problem of small size and poor uniformity due to the drawing of strips, and does not cause a large amount of glass to be produced due to the temperature change of the molding furnace. Forming bubbles, which lead to the scrapping of formed glass, the forming specification of optical glass has also been raised from below 700mm*700mm*200mm to large-diameter optical glass capable of forming 1200mm*1200mm*200mm, especially capable of forming a refractive index of 1.50-1.53, Large-aperture high-precision optical glass with Abbe number 58-66

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