Physical tempering method for tempered sight glass
The principle of tempering is the sight r glass is heated to a suitable temperature after rapid cooling, the glass mirror surface of a sharp contraction, produce compressive stress, and the glass mirror middle cools slowly, b efore the formation of shrinkage, tensile stress, to obtain high strength glass mirrors. In general, the higher the cooling strength, the greater the glass view mirror strength. There are many methods of physical tempering, which can be divided according to the cooling medium, which can be divided into gas medium steel method, liquid medium steel method, particle steel method, fogging method and so on.
2.1 gas medium steel method
Gas medium steel method, that is, wind cooling steel method.  The methods include horizontal air cushion toughening, horizontal roller mill, vertical steel and so on. The so-called wind cooled toughening method is the softening temperature (650~700) of the glass view mirror heated to the glass view mirror.  C), and then the two sides of it are blown with air at the same time to cool it quickly to increase the mechanical strength and thermal stability of the glass view mirror. Glass mirror heating quenching is an important link in physical tempering process to produce tempered glass mirror, basic requirements for quenching glass mirror is rapid and uniform cooling, so as to obtain uniform stress distribution, in order to obtain a uniform cooling glass mirror, there must be a cooling device to remove hot air, effective evacuation accidental broken glass mirror and should try to reduce the noise.
Advantages and disadvantages:
The advantages of air cooled tempering are low cost, large output, high mechanical strength and heat resistance (high safety working temperature of up to 287.78. C) and higher heat-resistant gradient (able to withstand)
204.44. C), and the air-cooled toughened sight glass can enhance the mechanical strength and form small fragments in the case of breakage, which can reduce the damage to the human body. But the sight glass thickness and shape have certain requirements (tempered by domestic equipment of ultra small glass mirror thickness is about 3 mm), and the slow cooling rate, high energy consumption, the thin glass mirror, glass mirror deformation problems still exist in the process of tempering, not in the higher quality requirements in the field of optics application.
Scope of application: at present, air tempering technology is widely used, and air tempered sight glass mostly used in automobiles, ships and buildings.

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