Uniform heating is a problem that must be considered when tempering glass in the tempering furnace, and in order to ensure the uniformity and yield of the tempered glass, it is necessary to set the heating parameters of the tempering furnace. 
The heating parameters of the tempering furnace include several aspects, mainly including upper and lower temperature, heating time, heating power and forced convection device.
This time, let's focus on the heating temperature and heating time of the upper and lower parts of the tempering furnace.
Generally speaking, the thinner the glass, the higher the heating temperature, and the thicker the glass, the lower the temperature.
For example, 3For 2-4mm glass, the upper temperature is generally 720-730, and the lower temperature is 715-725; For 15-19mm thick glass, the upper part should be set at 660-665 and the lower part should be set at 655-660.
Now that we've talked about the heating temperature setting, let's take a look at the heating time.
For radiant tempering furnaces, the heating time is usually 40-50 seconds per millimeter of glass thickness, i.e. if the glass thickness is 5mm, then the heating time is 5x40 seconds = 200 seconds.
However, this is not certain, and it is necessary to adjust it in a timely manner based on factors such as the size of the single glass area and the number of sheets.
For example, when tempering glass with holes and slots, the heating time should be increased by 25%-5%；When tempering sharp glass with an angle of less than 30°, the heating time is reduced by 2 compared with ordinary glass5%-5%；The heating time of heat-absorbing glass is generally reduced by 5% compared with ordinary glass;
Coated glass and heat-reflective glass should be increased by 25%～10%；The heating time of the embossed glass is determined according to the thickest part of the glass.
Glass with different properties, materials and thicknesses have different requirements for heating temperature and time, and in the actual tempering, it is necessary to set it according to specific needs.
The heating power and forced convection settings are to better control the heating time and heating temperature through the power setting and strong air flow, so as to ensure the uniform and efficient production of tempered glass.
In view of the strict requirements of the above aspects, when carrying out the operation of tempered glass, the operators are required to undergo strict professional training, be familiar with the processes and steps of tempered glass, and be able to flexibly respond to sudden situations, and have the ability to find and deal with faults in time.
Of course, there are other factors that affect the quality and uniformity of tempered glass, such as the quality of the original glass, the operation of the pretreatment stage, and the cooling time and temperature, etc., which will affect the quality of tempered glass.
Only by strictly setting the heating parameters of the tempering furnace can we better ensure the quality of tempered glass, improve the yield rate, continuously improve the revenue of the enterprise, and expand the market share.
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