Lower die, production method of lower die, method for producing glass gob, and method for producing glass molded body

A manufacturing method, glass molding technology, applied in glass molding, glass pressing, manufacturing tools, etc., can solve problems such as air cannot be discharged, achieve the effect of preventing air accumulation, preventing substrate degradation, and excellent durability

Active Publication Date: 2011-02-23
KONICA MINOLTA OPTO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The air that enters the concave part cannot be discharged, and the molten glass droplet is kept in a sealed state until it cools and solidifies, so there is a problem that concave parts (air pooling) appear on the lower surface of the produced glass gob and glass molded body.

Method used

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  • Lower die, production method of lower die, method for producing glass gob, and method for producing glass molded body
  • Lower die, production method of lower die, method for producing glass gob, and method for producing glass molded body
  • Lower die, production method of lower die, method for producing glass gob, and method for producing glass molded body

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Experimental program
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Effect test

Embodiment 1～4

[0124] according to Figure 7 In the flow shown, a glass molded body was produced. The manufactured glass molding had an outer diameter of 7 mm and a center thickness of 3.5 mm.

[0125] First, as shown in Table 1, four types of lower molds 10 (Examples 1 to 4) were prepared. The base material 13 adopts a superhard material mainly composed of tungsten carbide. The materials described in Table 1 were formed as the intermediate layer 12, and then a chromium metal film was formed as the cover layer 14. The thickness of the intermediate layer 12 is 0.3 μm, and the thickness of the covering layer is 0.5 μm, both of which are formed by the sputtering method.

[0126] After the coating layer 14 is formed, the surface 15 of the coating layer 14 is immersed in an etching solution for roughening treatment. As the etching solution, a commercially available chromium etching solution (ECR-2 manufactured by Nacalai Tesque Co., Ltd.) containing cerium ammonium nitrate was used.

[0127]...

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Abstract

Disclosed is a lower die for receiving molten glass drops which were dripped. A coating layer is formed on a base material through an intermediate layer, and surface roughening is performed on the surface of the coating layer in order to increase arithmetic average roughness (Ra). The surface of the coating layer subjected to the surface roughening has an arithmetic average roughness (Ra) of 0.01 [mu]m or more, and an average length (RSm) of a roughness curve element of 0.5[mu]m or less.

Description

technical field [0001] The present invention relates to a lower mold for receiving drops of molten glass and a method for manufacturing the same, a method for manufacturing a glass gob using the lower mold, and a method for manufacturing a glass molded body using the lower mold. Background technique [0002] In recent years, glass optical elements have been widely used as lenses for digital cameras, optical pickup lenses for DVDs, etc., lenses for mobile phone cameras, coupling lenses for optical communication, and the like. As such a glass optical element, a glass molded body formed by press-molding a glass material with a molding die is currently widely used. [0003] As a method for producing a glass molded article by press molding, two methods, namely, a reheat press method and a droplet forming method, are known. The reheat molding method is a method of heating a pre-made glass preform (preliminary molding) with a predetermined quality and shape together with a molding...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B11/00C03B11/08
CPCC03B2215/32C03B19/101C03B2215/34C03B2215/11C03B2215/12C03B2215/16C03B11/086C03B2215/20C03B2215/22C03B2215/03
Inventor 速水俊一福本直之长谷川研人
Owner KONICA MINOLTA OPTO
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