Definition and general context

Tempering machines are industrial equipment designed to subject materials, mainly glass, to a controlled heat treatment that increases their mechanical and thermal resistance. This process, known as quenching or hardening, involves heating the material to a specific temperature and then rapidly cooling it using a cold air blowing system. In this way, internal tensions are generated that improve their physical properties.

Tempering is essential in the manufacture of glass for security, automotive, construction and home appliance applications, among other sectors. Additionally, tempering machines have been adapted to process other materials that require improved strength, expanding their usefulness in modern industry.

Thermal tempering process

The tempering process begins with uniform heating of the material, generally flat glass, at temperatures ranging between 600 and 700 degrees Celsius, close to the softening point of the glass. This heating is carried out in a special oven that guarantees that the entire surface reaches the temperature required for subsequent treatment.

Once the proper temperature is reached, the material is quickly transferred to a cooling chamber where a strong jet of cold air is applied to its surfaces. This rapid cooling generates a hardened outer layer while the core remains in a hotter state, creating an internal stress system that significantly improves mechanical resistance.

This mechanism of internal tensions is what gives tempered glass its characteristic of fragmenting into small, non-cutting grains in the event of breakage, increasing safety in its use. Precise control of temperatures and times is vital to obtain homogeneous and quality tempering.

Main components of the machines

Tempering machines are composed of several fundamental parts: the heating oven, the automatic conveying system, the cooling chamber with air blowers and the automated control system. The oven usually uses electric resistances or gas burners to generate the necessary heat.