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What are the main factors affecting the yield of bent steel glass?
Release time:
2022-01-13 12:04
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Bent steel glass has the characteristics of high plasticity, high strength and safety, and has been more and more used in automobile, ship, decoration and other industries.bent steel glassCracking during forming and tempering is one of the main factors affecting the yield of bent steel glass, which greatly increases the production cost of bent steel glass.
In order to reducebent steel glassSome of the main factors affecting the yield of bent steel glass will be discussed below. The bending and tempering process parameters mainly include: glass heating furnace temperature, forming speed, bending time, cooling speed, etc., which are closely related.
1. Effect of heating
When the glass is tempered, it must be heated evenly, otherwise it will cause uneven heating and temperature difference of each part of the glass, resulting in uneven stress distribution in each part, and the possibility of glass cracking is greater.
The heating temperature should not be too high, otherwise the glass will soften seriously, viscous flow and deformation will occur, which will directly affect the surface quality of the glass. In general, the furnace temperature can be set to 680-700 ℃. The heating temperature and time are set according to the glass thickness and layout size.
2. Influence of bending time, arc changing speed and arc changing radius
Glass loses heat when it comes out of the furnace. When the glass surface temperature is about 630 ℃ and the room temperature is about 15 ℃, the glass temperature decreases at a rate of about 30 ℃/s. Therefore, the glass discharge speed should be appropriately increased, and the arc exchange speed should be appropriately adjusted according to the glass thickness. The speed (3-6mm) should be greater than (8-12mm), otherwise the glass will break due to heat loss before arc exchange is in place. bent steel glass
In the forming process, the arc change speed of thick glass should be appropriately slow, and the arc change speed of thin glass should be as fast as possible; the smaller the radian radius R, the faster the forming speed. The larger the radius R, the slower the forming speed.
If the bending time is too long and the heat loss is too large, the glass surface will harden. During the bending process, the convex surface of the glass will be stretched and destroyed.
In addition, when the discharge glass is bent, the concave surface of the glass is close to the male mold. The male mold is a solid structure covered with asbestos paper. The heat exchange between it and the glass is mainly heat conduction. Asbestos is a good thermal insulation material, so the concave surface of the glass loses less heat through heat exchange.
The other side of the glass, the convex surface, is in contact with the frame of the female mold. Most of the surface is exposed to the air, and the air is convective heat exchange, so the heat loss of the glass convex surface is greater. bent steel glass
3. Cooling effect
In actual production, the wind pressure when blowing into the cooling air grid is generally adjusted to be the same. Due to the different temperatures on both sides of the curved glass, as mentioned above, the heat loss of the convex surface of the glass is greater than the heat loss of the concave surface. In this way, asymmetric cooling will inevitably lead to uneven glass tempering, serious asymmetric stress distribution, tensile stress layer will move to the surface, thereby reducing the internal quality of tempered glass, cracks may increase. bent steel glass
Under the premise of ensuring the quality of the arc, try to shorten the blowing lag time to ensure the degree of tempering of the glass.
In addition, the movement of the cooling air grille is not synchronized, some air nozzles of the air grille are blocked, the glass exceeds the effective blowing area of the air grille, the glass is not located in the middle of the air grille, and is biased to one side or one side. It will also cause uneven glass tempering and increase the risk of cracking of bent steel glass.
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