How to improve the quality and yield of tempered glass?

Glass tempering furnace is used to produce various tempered glass, flat tempered glass, curved tempered furnace glass, etc. Tempered glass can be seen everywhere in daily life and is used more and more widely. There are more and more glass processing companies producing tempered glass. How to effectively improve the yield of tempered glass is a question that all glass deep processing companies have always been concerned about.

To improve the yield of tempered glass, the following points must be achieved:

1. Glass must be edged before tempering. The quality of glass edge grinding plays a decisive role in the tempering yield. When the glass is cut, it will leave very small and fine cracks on the edges, which are almost invisible to the naked eye. There are two functions of edge grinding. One is to be beautiful, and the other is to prevent it from being easily broken during tempering and improve the yield of tempered glass.

2.  Adjust the tempering process parameters. The process parameters of tempering are mainly heating temperature, heating time, wind pressure time of tempering cooling and tempering cooling time. Tempering temperature and heating time are inversely proportional. The higher the temperature, the shorter the heating time is. However, when we are tempering glass thicker than 12mm, if the temperature of the furnace is too high, it is easy to explode in the furnace. Of course, there are many reasons for furnace explosion, and setting the furnace temperature too high is the main reason. It is recommended that when tempering glass over 12mm, the furnace temperature should be set to about 665 degrees and the heating time should be appropriately extended. After determining the temperature, you need to choose a reasonable heating time. Generally, the heating time per millimeter is about 40 seconds. However, when tempering large-format glass, it is necessary to increase the heating time by 10%, and when tempering glass with holes or corners, it is also necessary to increase the heating time by 10%. It is very important to dialectically grasp the heating time and heating temperature, and it is also the key to improving the yield of tempered glass.

3. The importance of uniform heating of glass. Glass is actually a cube with 4 sides and 6 faces. The upper and lower surfaces of the glass heat relatively slowly. When tempering large-format glass, the middle of the glass often heats the slowest. Sometimes the tempered glass will form a pot shape (especially large-format glass that is close to a square). This is It is caused by the edges heating too fast and the middle heating too slowly. That is, after the heating is completed, the temperature of the edges of the glass is much higher than the temperature of the middle of the glass. In order for large-format glass to be heated evenly, it is best to set the temperature of the furnace to a heating curve (horizontally) with the temperature in the middle being 10 degrees higher than the set temperature and the temperature at the edges being 10 degrees lower than the set temperature. The tempered glass in this way has both uniform granularity and uniformity. 

4. Glass with holes and corners.

Generally speaking, if you need to drill holes in tempered glass, you need to pay attention to the following points:

4.1. The aperture should be greater than or equal to the thickness of the glass;

4.2. The distance between the hole edge and the glass edge is greater than or equal to twice the thickness of the glass;

4.3. The distance between the two holes and the distance between the edge of the hole and the edge of the hole shall be greater than or equal to twice the thickness of the glass. If this requirement cannot be met and holes must be drilled, slotting can be used to solve the problem. Without affecting the use and appearance, use a cutting machine to cut a small opening between the glass edge and the hole on the edge of the glass. This is the best solution to solve the problem of parts that do not meet the drilling requirements but must be drilled.