Advantages and disadvantages of liquid medium toughening

Advantages and disadvantages of liquid medium toughening
The liquid medium is cooled by tempering method. The cooling method is the sight glass is heated to the softening point, the quench tank is filled into the liquid in sight glass. 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. The British Triplex company used the liquid medium method to toughen the sight glass with a thickness of 0.75 to 1.5 mm as early as in the 80s of last century. It ended the history of physical toughening and could not toughen thin sight glass mirrors. 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 applicable to thin sight glass view mirrors of small size, such as sight glass sight glasses. Liquid crystal display sight glass view mirror, optical instrument and instrument with sight glass and so on.

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