How to control the temperature during the production of glass tempering furnace?

The production process of fiberglass tempering furnace is to heat the glass to a specific temperature, then quickly cool it down, thereby improving the mechanical properties and thermal stability of the glass. Therefore, the control of the tempering process is essentially to control the heating and cooling processes. During this process, whether it is heating or cooling, it is closely related to temperature. Therefore, in the glass tempering process, precise temperature control is the key to ensuring the quality of tempered glass. So let's explain to you how to control the temperature during the production of glass tempering furnaces.

How to control temperature during the production of glass tempering furnace

1. Set a reasonable heating temperature

The thicker the tempered glass, the lower the heating temperature, while the thinner the tempered glass, the higher the heating temperature. In the production process of tempered glass, the heating temperature cannot be accurately determined, and the selection of temperature mainly depends on the quality of the original glass and the process parameters adjusted by the operator. In addition, the bottom temperature measured by the heating device is not the temperature of the roller, but is compensated by the heating element at the bottom of the tempering furnace to absorb the average temperature of the glass on the roller. Therefore, the measured temperature is usually higher than the upper temperature, so the upper temperature of the tempering furnace is higher than the lower temperature.

2. Uniform heating

Reasonable placement of glass plates is to ensure uniform distribution of longitudinal and transverse loads in the electric furnace, that is, the arrangement of glass plates in each furnace and the interval time between each furnace must be consistent. In order to understand the temperature variation pattern from the heating furnace to the quenching chamber, it is necessary to understand the various factors of glass plate arrangement: due to the movement of glass along the front and back of the electric furnace, the part near the edge of the glass roller is prone to overheating, and it will appear on the surface of the roller between the two glasses. In actual production, if the glass plates are always arranged in the same way in the tempering furnace, the temperature of each roller varies significantly. Therefore, when the position changes, the glass will bend or break in the rapid cooling chamber.

To prevent the gap between glass plates from causing an increase in temperature inside the heating furnace, the glass plates on the feeding table are arranged reasonably, making it easier to maintain the temperature uniformity of the rollers. That is, there is a longitudinal gap during the feeding process, and this gap should be filled in the next feeding. In addition, placing a furnace of glass in a relatively long longitudinal gap (greater than or equal to half) has a much more significant adverse effect than placing glass throughout the entire longitudinal length. This is because this high temperature gap is affected at the beginning of heating and requires sufficient time for the temperature to equilibrate.

3. Reasonable heating time

The heating power of the tempering furnace is fixed, and the generally set heating time (electric furnace heating time) is 35-40 seconds per millimeter of thick glass. If the temperature setting of the electric furnace changes, then we will change the temperature of the heated glass to the same temperature. To keep the glass constant within ± t seconds, we must adjust the heating time within ± t seconds.

In summary, how to control the temperature during the production of glass tempering furnaces? I have finished answering questions for everyone. I hope it will be helpful to you