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Simple analysis of glass quality problems during the production of glass tempering furnace (2)

Time: 2019/12/12 18:55:07 Source: admin

生产过程中 出现玻璃质量问题的简单分析(一),接下来小编为大家分享二 Above, Xiaobian shared a simple analysis of glass quality problems in the production process of glass tempering furnace (1), and then Xiaobian shared 2

2.2 Optical Problems of Tempered Glass

1)中央部分呈灰色有些玻璃被钢化后,接触辊道的表面会出现灰蒙蒙的现象。 ( 1) The central part is gray. After some glass is tempered, the surface contacting the roller table will appear gray. This situation makes the glass's see-through performance worse, and it often occurs in the middle of the glass. There are two main reasons for this to happen: ① The roller temperature in the heating furnace is too high. This situation often occurs in the first two furnace glasses of the tempering furnace. In this case, you can appropriately increase the pressure of the heat balance blower or reduce the empty furnace time to ensure continuous glass production; ② The amount of SO gas used is too large. If SO is used as a protective gas for glass, if it is used too much, or it is used too frequently, it will cause a gray phenomenon on the glass surface.

2)应力斑过重问题通过物理钢化方法生产的钢化玻璃都会出现应力斑现象,这是由物理钢化的生产原理决定的,同时也是无法避免的。 ( 2) The problem of excessive stress spots The phenomenon of stress spots occurs in tempered glass produced by the physical tempering method, which is determined by the production principle of physical tempering and is also unavoidable. Sometimes this phenomenon is also used to identify whether the glass is tempered glass, but when the stress spot is too heavy, especially when observed under specific light conditions, this phenomenon becomes a problem of appearance quality defects. The problem of excessive stress spots is usually caused by the following three reasons: ① excessive wind pressure during the rapid cooling process. This high-pressure, high-speed airflow blows to the softened hot glass, which will increase the stress spots of the tempered glass. This situation can be avoided by adjusting the parameters of the wind pressure; ② When the glass has just entered the cooling room from the heating chamber and has started to blow and quench, the swing of the wind grid or the rotation of the roller table is stopped, resulting in the wind of the wind grid. Mouth blows only one part of the glass. When this happens, the wind grid swing or the rotation of the roller table should be synchronized with the blowing; ③ When the air cooling is started in the cooling room, the wind nozzle of the wind grid is too close to the glass. When this happens, the height of the wind grille can be appropriately increased by adjusting the parameters without affecting the particle size and other quality requirements of the glass.

3)钢化玻璃的虹彩现象钢化玻璃的虹彩现象是一种光学现象。 ( 3) Iridescent phenomenon of tempered glass The iridescent phenomenon of tempered glass is an optical phenomenon. During the forming process of the float glass, harmful substances such as oxygen and water enter into the tin bath. Oxidation reaction with tin at high temperature produces SnO and SnO, among which Sn and Sn penetrate into the lower surface of the float glass through the tin solution, and An extremely thin Sn- and Sn-containing layer is formed. When this float glass with high tin penetration is tempered, after the glass is heated in the tempering furnace, the SnO on its surface is oxidized to SnO, and its volume increases, causing tiny wrinkles on the glass surface. Under the irradiation of light, the interference phenomenon of light occurs. Therefore, the iridescence of tempered glass has a relationship with both the quality of the float glass as the original glass and the tempering process. In the tempering production of glass, in addition to selecting high-quality float glass as the original sheet, the heating temperature and heating time parameters of the tempering furnace must be adjusted to adapt to the actual conditions of different original sheet glass.

2.3 Tempered glass appears white

The white appearance of tempered glass is caused by the wear of the glass surface. For the upper and lower surfaces of the glass, the way they are heated in the heating furnace is different. The upper surface is mainly heated by radiation, while the lower surface is heated by both conduction and radiation. When the glass enters the initial stage of the heating furnace, the lower surface of the glass is subjected to the combined effect of the two heating methods, and the temperature obtained in the same time is higher than the upper surface. In severe cases, the glass will bend upward. At the same time, due to the friction between the lower surface of the glass and the roller, a white track phenomenon will occur.

4种方式来解决:①通过调整加热参数,适当降低加热炉的下部温度。 In order to solve this problem, we can solve it in the following 4 ways: ① Lower the temperature of the heating furnace appropriately by adjusting the heating parameters. If necessary, lower the power of the lower part; ② Increase the upper temperature of the heating furnace accordingly; ③ When the white track appears in the middle of the glass, increase the heating balance value; Change the heating curve; ④ In the production process, continuous production must be done to prevent the furnace from running without load.

2.4 Scratches on the surface of tempered glass

Although the scratch on the surface of tempered glass is a defect of appearance quality, it will destroy the uniform distribution of stress on the glass surface, resulting in a reduction in the mechanical strength of the glass. 3种:①辊子上粘有坚硬的异物。 There are usually three reasons for this phenomenon : ① Hard foreign matter sticks to the roller. When this happens, the temperature of the furnace must be lowered, and the foreign matter on the rollers should be cleaned. ② The ceramic roller or the cooling roller slips. If this happens, check the transmission of the rollers one by one, fasten the transmissions or repair the damaged rollers. ③ Broken glass may be stuck at the upper and lower wind grills. If this happens, check the wind grille and completely remove the broken glass stuck at the wind grille.

2.5 pitting phenomenon of tempered glass

The pitting phenomenon is also one of the defects in the appearance quality of tempered glass, which can usually be divided into two types: one is intensive. The pits are usually concentrated in orange peel, which is caused by too long heating time or too high heating temperature. This situation can be solved by adjusting the heating time parameter or temperature parameter; the other is a dispersion type. Individual pits are distributed in the form of stars, which is caused by the surface of the loading table or roller table is not clean, or the roller table under the wind grid is not clean. In order to reduce the occurrence of pits, companies can establish a roller cleaning system and regularly clean the roller table.

The above is the entire analysis of the quality problems in the production process of the glass tempering furnace shared by Xiaobian. I hope it will be helpful to everyone in the operation process.



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