Method and equipment for mould-pressed glass product

A technology of glass products and molding, which is applied in the field of direct pressing system and can solve undisclosed problems

Inactive Publication Date: 2002-03-20
HOYA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these documents do not disclose a method that can effectively reduce the temperature difference betwe

Method used

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  • Method and equipment for mould-pressed glass product
  • Method and equipment for mould-pressed glass product
  • Method and equipment for mould-pressed glass product

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Embodiment Construction

[0026] An embodiment of the present invention will be described below with reference to the accompanying drawings. Among them, a method of molding an optical lens blank as a glass product by using a turntable as a conveying device and sixteen lower molds arranged on the circumference of the turntable will be aimed at. According to the temperature of the glass gob, the area in contact with the molding surface of the lower mold and its surroundings are called the lower part of the glass, and the other area exposed to the ambient atmosphere that is not in contact with the molding surface of the lower mold and its surroundings are called glass. the upper part. In addition, a part of the upper part of the glass surface-molded by the upper die is called an upper surface.

[0027] Such as figure 1 As shown, a plurality of stations A to P for the various steps of the method of the invention are arranged on the turntable 10 . As shown in the figure, a plurality of lower dies 11 , si...

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Abstract

On molding a glass product by pressing a glass gob by the use of a mold composed of upper and lower dies each of which has a molding surface, a molten glass is supplied as the glass gob onto the molding surface of the lower die. Cooling is carried out for an upper surface of the glass gob supplied onto the molding surface of the lower die. After the cooling, heat radiation suppression is carried out to suppress heat radiation from the glass gob so that an inner part and an upper part of the glass gob are close in temperature to each other. Thereafter; the glass gob is pressed by the molding surfaces of the upper and the lower dies when the glass gob has a viscosity within a range between 103.5 and 106.5 poises (dPa.s). Preferably, the heat radiation suppression is carried out by making a heat shielding member lower in temperature than the inner part of the glass gob approach the upper part of the glass gob in a non-contact state.

Description

technical field [0001] The present invention relates to a method and apparatus for molding glass articles such as optical lens blanks, and more particularly to a method and apparatus for a so-called direct molding system in which molten glass is fed into a mold in which it is pressed. type. Background technique [0002] As a method of molding glass semi-finished products (hereinafter referred to as lens blanks), a direct pressing system of a method of grinding and polishing a lens blank into a glass product such as an optical lens or a state before a final glass product, due to its high productivity high, and thus widely used. In a direct pressing system, glass material is melted in a furnace into molten glass. A suitable measure of molten glass is sheared using a knife such as scissors and fed into a die (die). The molten glass added to the lower mold forms glass gobs with a generally marble shape under the action of its surface tension. The lower mold with the glass go...

Claims

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Application Information

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IPC IPC(8): C03B11/00C03B11/12
CPCC03B11/125Y02P40/57
Inventor 前田伸广斋藤淳
Owner HOYA CORP
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