One-time half-molding device for glass drop

Abstract

The name of the present invention is a one-time half-molding device for glass drop. It belongs to the technical field of glass molding. It mainly solves the problems of concave and surface shrinkage of the existing optical glass in large-size drop molding. Its main features are: it consists of a turntable, a pre-pressing mold, a cooling tunnel, a forming mold, a heating tunnel, an infrared temperature monitor, and a manipulator. On the bottom mold on the turntable, 8 bottom molds are set on the inner circumference at equal distances, and 8 bottom molds are set on the outer circumference at equal distances. By rotating by the manipulator, the travel of the glass drop on the turntable is extended, which is a large-scale glass drop. Cooling and heating add space. There are cooling and heating tunnel bins on both sides of the bottom mold, so that the large-size droplets pass through the tunnel bins to cool first and then heat rapidly. Before molding, the temperature inside and outside the glass is close to that of the viscosity uniformity. Consistent shrinkage, reduced dents and surface wrinkles, and improved dimensional accuracy. Simultaneous monitoring of the process reduces molding commissioning time.

Description

technical field [0001] The invention belongs to the technical field of glass molding, and particularly relates to a glass drop molding device. Background technique [0002] Glass forming is the process of naturally cooling or pressing molten glass into products with geometric shapes. This process is called one-time glass forming or hot-end forming. The hot-end forming produced by pressing is called one-time hot pressing. After the glass formed by the hot end is cooled, it is cut, spheronized, and then heated to a softened state for re-molding. The process is called secondary molding. Compared with the secondary material, the advantages of the primary drop material are simple process, low energy consumption, low cost, high utilization rate of raw materials, and good consistency due to the use of high temperature glass liquid for direct shear pressing. But there are two disadvantages. One is that the surface shrinkage and deformation are serious, resulting in a large machinin...

AI Technical Summary

Problems solved by technology

But there are two disadvantages. One is that the surface shrinkage is serious and the processing allowance is large. The reason is that the glass needs high temperature flow and shearing. The temperature difference between the inside and outside of the drop material is large, and the surface is sunken and shrinkage is serious.

[0005] Literature patent CN 102849927 B is mainly to solve the problems of low molding viscosity, short material property, high waste of optical glass frit that is easy to crystallize, long production cycle and high cost of optical components in existing production, and it is to solve the problem of high waste of glass frit for small viscosity grades. , The problem of long production cycle and high cost of optical components is not a solution to the defects of one-time hot pressing

[0006] Literature patent 99125485. 6 provides a solution to the shrinkage problem after cooling caused by the large temperature difference between the inside and outside of the primary drop, which can be used to solve the problem of a large processing allowance in one-time hot pressing, but this solution is only theoretically feasible. However, there are problems encountered in the actual operation process: First, when the viscosity of the glass is around 103.5 to 106.5 poise, some brand drops with a large expansion coefficient, or large-scale drops cannot be cooled rapidly, and surface frying and steps will occur due to rapid cooling. Second, the shape and quality of drop material are limited, especially for drop material with a small surface area to volume ratio, and as the volume increases, the setting time will increase significantly, and the cooling time will not be sufficient. Reducing the temperature at the center of the material does not achieve the purpose of making the temperature of the inner and outer peripheral parts of the glass close to each other, and it is difficult to achieve the purpose of suppressing the occurrence of dents on the glass surface by reducing the difference in thermal shrinkage of the glass after extrusion, so the The method is only suitable for products with relatively large surface area and volume, or light weight products; third, the mold needs to be able to be cooled and heated rapidly, and its auxiliary cooling and heating only involve a few mold positions, and its working effect and controllability are poor. Repeated debugging can achieve the above effect and the state will not be particularly stable, and the practicability and popularization are not strong, so this patent has not been promoted

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