Method for toughening 12mm toughened glass

Abstract

The invention discloses a method for toughening a piece of 12mm toughened glass. The method comprises the following steps of horizontally placing the glass to be processed onto a roller bed, delivering the glass to be processed into a passage type toughening furnace through the roller bed, sequentially conducting heat treatment at intervals, and cooling two surfaces of the glass through high-pressure air until the surface temperature of the glass reaches 330 to 350 DEG C; placing the glass into 10 to 15 percent potassium nitrate glycerol solution at the temperature of 150 to 160 DEG C to be cooled for 3 to 4 minutes; then placing the glass into the potassium nitrate fused salt at the temperature of 350 to 360 DEG C to be heated for 5 to 6 minutes; and taking out the glass to be naturally cooled in the air. Through the interval heating and cold treatment, the stress distribution on the surface of the glass is adjusted, and the flatness of the toughened glass is guaranteed; and through the treatment in the potassium nitrate glycerol solution and the potassium nitrate fused salt, the toughened degree of the glass surface is increased, the self cracking possibility of the glass in the cooling process can be reduced, the yield of finished products of the toughened glass can be increased, and the performance index requirement of the toughened glass can be met.

Description

technical field [0001] The invention belongs to the field of glass preparation, and in particular relates to a preparation process of tempered glass. technical background [0002] Tempered glass has been widely used due to its advantages such as high mechanical strength, excellent thermal shock resistance, and good safety. Most of the existing tempered glass production processes adopt the tempering process using air as the cooling medium, so that the heated glass is subjected to chilling treatment in a short period of time through a large amount of air, thereby completing the tempering process. In order to ensure the performance of tempered glass, it is usually necessary to provide a large flow of air in a short period of time, especially when tempering thin glass. Usually, a high-power fan with high wind pressure and large flow is used to blow air at the same time. [0003] At present, there are also chemical tempering methods for glass tempering. The strength of chemical ...

AI Technical Summary

Problems solved by technology

[0003] At present, there are also chemical tempering methods for glass tempering. The strength of chemical tempered glass is close to that of physical tempered glass, but the time is too long, the efficiency is low and the production cost is high.