Physical toughening of sight glass Ⅱ
The principle of physical toughening is to cool the sight glass quickly after heating to a suitable temperature, so that the surface of the sight glass mirror shrinks rapidly, resulting in compressive stress. However, the cooling of the sight glass layer is slower, and it is too late to contract, so it forms tensile stress and makes the sight glass get higher strength. In general, the higher the cooling strength, the greater the strength of the sight glass. 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.
The liquid medium tempering process liquid medium tempering method, namely liquid cooling method. The cooling method is the sight glass is heated to the softening point, the quench tank placed filled with liquid in tempering. At this time, as a cooling medium, salt water can be used, such as potassium nitrate, potassium nitrite, sodium nitrate, sodium nitrite and other mixed brine. In addition, mineral oil can also be used as a cooling medium, and the addition of toluene or carbon tetrachloride can also be added to the mineral oil. Some special quenching oil and silicone oil can also be used. In liquid tempering, the edge of the sight glass into advanced quench tank, so there will be uneven stress caused by explosion. In order to solve this problem, it can be pre cooled by air cooling or spray, and then put into the organic liquid. You can also add water and organic solution in the quench tank, the organic solution floating in the water above, when the heated sight glass mirror into the slot, play a role in organic solution cooling, absorbing part of the heat, and then enter the water cooling in addition to the immersion cooling liquid, you can also use the liquid spray method. But more generally with the immersion method. Triplex, a British company, had been toughened by liquid medium as early as the 80s of last century.
The sight glass of 0.75 to 1.5 mm ends the history of the physical tempering that can not be toughened to the thin sight glass view mirror. The difficulty is to establish the method of toughened liquid cooling system process is reasonable, two problems should be paid attention to in the liquid tempering: one is the high pressure stress produced by layer two is to avoid explosion of sight glass mirror.
Advantages and disadvantages:
Using liquid medium tempering method, because the heat of the water is bigger and the gasification heat is high, the consumption is greatly reduced, so that the energy consumption is reduced, the cost is reduced, and the cooling speed is fast, the safety performance is high, and the deformation is small. As the sight glass is heated to be inserted into the liquid medium after the sight glass is heated, it is easy to affect the quality and yield of the larger sight glass.
Scope of application: it is mainly suitable for thin sight glass with small size, such as sight glasses. Liquid crystal display sight glass, optical instrument and instrument with sight glass and so on.

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