Views: 0 Author: Site Editor Publish Time: 2024-04-12 Origin: Site
The production of tempered glass requires a process of heating, cooling, and forming, and the parameter settings in each stage are related to the yield and quality of tempered glass. These parameters are not fixed when set, but need to be set according to the different parameters of the glass tempering process. Below, we will introduce the specific method of setting the processing parameters for glass tempering furnaces.
1. Process parameter setting for heating section
Uniform heating is a crucial factor in tempered glass, and the parameters that need to be adjusted in the heating section mainly include: upper temperature, lower temperature, heating power, heating time, temperature adjustment, balance device, and forced convection (thermal circulation air) device.
1.1. Heating temperature setting: In general, the temperature setting of the heating section follows the principle that the thicker the glass, the lower the heating temperature, and the thinner the glass, the higher the heating temperature. The specific adjustment method can refer to the heating temperature of the glass tempering furnace discussed in the previous article.
1.2. Heating time setting: Generally, the heating time is determined based on the thickness of the glass. For glass with a thickness of 3.2-4 millimeters, the heating time is about 35-40 seconds per millimeter. Glass with a thickness of 5-6 millimeters is about 40-45 seconds per millimeter. Glass with a thickness of 8-10 millimeters is about 45-50 seconds per millimeter. A 12mm glass with a thickness of approximately 50-55 seconds per millimeter. Glass with a thickness of 15-19 millimeters is about 55-65 seconds per milliliter. The specific heating time needs to be adjusted according to the actual processing situation, depending on the different softening points, color, thickness errors, and other factors of the glass raw material.
2. Process parameter setting for air-cooled section
2.1. Glass tapping speed setting
The speed of glass discharge has a significant impact on the temperature of the glass itself during air-cooled quenching. The slower the discharge speed, the more heat is lost during the glass transfer to the cooling section. The thinner the glass, the stricter the temperature requirements during air cooling quenching, and the faster the furnace discharge speed. Improper setting of the discharge speed can easily cause uneven heating and cooling of the glass before and after, leading to cracks and explosions in the cooling section.
2.2. Cold swing speed setting
The cold swing speed of glass affects the uniform cooling of glass. Unreasonable cold swing speed can cause irregular fragments to appear after glass tempering. The thinner the glass thickness, the higher the wind pressure requirement. The thicker the glass thickness, the lower the cold swing speed. Distance indicates that if the cold swing speed set for producing tempered glass with a thickness of 5mm is 250mm/s, the cold swing speed can be reduced to 200mm/s for producing tempered glass with a thickness of 6mm
2.3. Tempering and cooling time setting
The cooling process is divided into two stages: the rapid cooling stage and the cooling stage. The tempering time refers to the rapid cooling blowing time after the glass enters the air-cooled stage from the heating furnace. Unlike the tempering time, the tempering time has a certain impact on the degree of rigidity, and the rapid cooling time is the process of stress formation on the glass surface. The similarity between tempering and cooling time adjustment is that they both need to be set according to the thickness of the glass.
The above is an introduction to the method of setting process parameters for glass tempering furnaces, which provides a detailed explanation of the different parameter setting rules for the heating section and air-cooled section of the tempering furnace. We hope this can be helpful to everyone. In addition, our company produces various specifications of tempered glass processing equipment. If you need anything, please feel free to call us for consultation.
