hot bending in glass tube factory
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-Time:2020-04-25 09:01
In the hot bending operation process of glass tube factory, it can be simply summarized as putting the matched large and small pieces of glass evenly sprinkled with silica powder between the two pieces of glass on the die, and then heating them to make the glass reach the softening point temperature, when the glass reaches the same curvature with the die under the effect of its own gravity or external pressure, stop heating, slowly annealing until the room temperature, until this completes the hot bending process.
The main control in the process of glass hot bending is: when the glass is preheated, the continuous heating or slow heating shall be adopted to make the temperature in the furnace consistent everywhere; the curvature radius of two overlapping glass bends shall be consistent, otherwise the optical distortion of the glass tube will occur; the glass tube must reach the temperature required by the hot bending; when the mold is placed on the carrying trolley The mold must be placed horizontally; the temperature in the furnace reaches 640-710 ℃, when the glass is formed, the glass will begin to deform under the action of its own gravity. In order to prevent the glass from settling suddenly when it is close to the softening temperature, and to prevent the glass surface from generating thermal bending ripples, the operator must always observe the formation of the glass in the furnace, and control it through observation The number, area and time of the switch of the heating lamp tube; the annealing of the glass should adopt the slow cooling method, and the glass should be taken out when the furnace temperature drops below 100 ℃. When the glass is hot bent, the original stress has been eliminated. In order to prevent the new stress due to the temperature gradient during the cooling process, the cooling speed within the annealing temperature range should be strictly controlled, especially at the higher temperature level. The glass shall be cooled slowly until the glass structure is completely fixed, so as to prevent the generation of permanent stress. The annealing curve shall be evenly changed, and the glass tube out of the furnace and falling frame shall not be placed at the air outlet of the workshop or the direct blowing place of the fan.
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