Tempered glass flatness is not good

Tempered glass flatness problems can be divided into two categories:
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Class 1, curved steel tempered flat problem is not good. Such problems usually consider their compliance index, when the curved steel products meet the degree of fit does not meet the design requirements, there will be the following three kinds of phenomena:
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(1) Finished glass and design requirements are distorted. This indicates that the need to bend the glass on the roller position is not properly placed, the glass bending of the center line and the roller is not parallel, if this happens, the operator needs to re-adjust the glass on the stage position, so that the glass The curved centerline is parallel to the table.
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(2) Finished glass is different from the design bending depth. This shows that the tempered process parameters set the problem: in the heating stage, the glass heating temperature is not enough; in the cooling stage, mainly the wind gate outlet and the outlet outlet is not synchronized, in the hair when a first open the hair, The If the lower air outlet first open the hair, then the shape of the glass after the bending depth will increase, on the contrary, the upper opening to open the first blow, the shape of the glass after the bending depth will be reduced, not according to the design depth of arc. At this point the operator can re-adjust the process parameters, appropriate to adjust the glass bending depth.
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(3) Finished glass surface quality does not meet the design requirements.
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The operator may adjust the bending time and the quenching time of the heating section, or the degree of tension of the bending section transmission chain, and solve the problem by adjusting the steel process parameters or equipment.
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Class 2, flattened tempered glass is not a good problem. Such problems are mainly in the following five cases:
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(1) glass in the heating surface on the surface of the existence of temperature difference caused by glass deformation
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① The tempered glass plate is bent upwards. This phenomenon is due to the glass in the heating furnace is heated, the glass surface temperature is higher than the temperature of the lower surface of the situation, to maintain this temperature state of the glass into the cooling room cooling, in the cooling process, when the glass on the lower surface The cooling temperature and the wind pressure and other conditions are the same, because the glass surface temperature is high, after cooling the upper surface of the shrinkage is greater than the lower surface, there will be glass plate surface bending deformation phenomenon.
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In this case, the temperature of the bottom of the furnace can be increased to minimize the temperature difference between the upper and lower surfaces of the glass.
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② tempered glass plate down bending. This phenomenon occurs because the glass is heated in the heating furnace, the temperature of the lower surface of the glass is higher than the temperature of the upper surface, and the glass in the temperature state is allowed to enter the cooling chamber. During the cooling process, when the glass upper and lower surfaces When the temperature of the lower surface of the glass is high and the amount of shrinkage on the lower surface after cooling is larger than that of the upper surface, the glass plate is bent downward. In this case, the temperature of the bottom of the furnace can be reduced to minimize the temperature difference between the upper and lower surfaces of the glass.
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(2) Glass in the middle of the heating and the edge of the existence of temperature difference caused by glass deformation
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After the glass has been heated in the heating furnace, if the temperature of the intermediate part is higher than the temperature of the edge, the shrinkage of the middle part of the glass with higher temperature will be greater than the contraction of the lower side of the temperature during the cooling process When the glass is cooled to room temperature, the edge size of the glass will be larger than the size of the middle part, and a large compressive stress will be formed at the edge of the glass, resulting in the downward bending deformation of the glass plate.
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Similarly, after the glass has been heated in the heating furnace, if the temperature of the edge portion is higher than the temperature of the intermediate portion, the amount of shrinkage at the middle of the higher temperature of the glass during the cooling process will be greater than the lower temperature When the glass is cooled to room temperature, the size of the middle part of the glass will be larger than the size of the edge, and a large tensile stress will be formed at the edge of the glass, resulting in the upward bending deformation of the glass plate.