Glass remoulding process

Abstract

The invention discloses a technique for glass post forming. The following steps are included: first, a glass motherboard is cut into glass stock which is consistent to the design weight requirement; second, the glass stock is put on a porcelain case which is made from infusorial earth; third, the porcelain case filled with the glass stock is transported to the heating area in a softening furnace through a transport unit, and an area stepped heating way is adopted to soften the glass stock; fourth, the softened glass stock is pressed and molded in a mould to obtain a performing body. In the invention, the glass stock is put on the porcelain case, and is transported to the softening furnace for heating treatment, thereby obviously reducing the blight brought to the diaphaneity of the glass when the glass stock directly slides on a refractory plate or a carrying roller to enter into the softening furnace; the adaptation of the area stepped heating way ensures that the softening degree of the glass stock is better controlled, the glass stock is convenient to be pressed and molded, raw materials are saved, and the nondefective rate of products is increased.

Description

technical field [0001] The invention relates to the technical field of glass processing, in particular to a glass reshaping processing method. Background technique [0002] Before glass is prepared for further processing of optical devices, it is often necessary to process bulk glass raw materials (hereinafter referred to as mother glass) into preforms of various specifications according to products of different specifications. The method of processing the mother glass plate into a preform is the glass reshaping process, which generally includes the following process. First, the mother glass plate is cut into a glass blank that meets a certain weight requirement, and the glass blank is used after preliminary grinding. As the temperature rises, the viscosity decreases. It is softened by raising the temperature in the softening furnace to near the softening point, and the softened glass blank is pressed into the molding mold by a glass forming machine, that is, it can be made ...

AI Technical Summary

Problems solved by technology

In the existing glass reshaping process, the glass blank is directly pushed on the refractory plate to be transported into the softening furnace for heat treatment or conveyed into the softening furnace for heat treatment by conveying rollers. In both cases, the glass blank will be Relative sliding, which inevitably affects the transparency of the glass preform and thus the performance of the optical device

Moreover, in the existing remolding process, the softening furnace usually uses one heating zone for heating, and it is not easy to control the softening degree of the glass blank. If the temperature in the furnace body is too low, the surface of the glass blank can be softened but the inner layer cannot be softened. The brittleness of glass, this kind of glass blank is prone to cracks when it is pressed into a preform, and then affects the quality of optical device products; to soften the inside of the glass blank, it is necessary to increase the temperature in the softening furnace. The glass tends to melt beyond the softening point, and the melted glass tends to have irregular shapes during the molding process, and even the glass liquid flows out, causing the preform to fail to meet the weight requirement, resulting in low product yield and waste of materials