Glass tempering process has three basic requirements, only to meet these basic requirements in order to produce a qualified laser glass products:

First, the glass must be heated to the required temperature, the temperature of each part of the glass surface to be uniform, the difference is not too large, the glass surface and the middle can not be too large. To control the three main aspects of the master:

First, according to the load of the electric furnace, select the reasonable heating temperature and control the temperature in the furnace effectively. In the heating furnace of glass are: conduction, radiation and convection, electric load is not mentioned here refers to the glass cover area of electric furnace, it refers to the relationship between the glass thickness, heating temperature and heating time, heating and tempering electric furnace used in the present most manufacturers generally can be divided into many heating zones very small, each district can be individually controlled by the host computer, under normal circumstances, the electric heating central heating element within the region, the total glass in the heat, in this area has been in the furnace, glass, this is the area of the heating effect is regional, if a district electric furnace heat consumption over heating effect, the temperature in this area began to decline, which is over loading, glass tempering success mainly depends on the minimum temperature of the glass plate Party, once the electric furnace has an overload phenomenon, furnace temperature will decline, resulting in glass during cooling cooling paragraph resulting in broken. Heating temperature setting, according to the thickness of tempered glass, tempered glass is thin, the temperature will be higher and higher to toughened glass is thicker, the temperature will be lower, for control of the heating temperature, the operating personnel to understand the relationship between furnace temperature and heating time and the temperature of the electric thickness of different glass change value, so I do not explicitly pointed out what kind of temperature setting is best, because the temperature but also to a large extent decided to the quality of the original piece of glass. In addition, heating system for measuring the temperature of the bottom and the temperature of the roller is not, but tempering furnace bottom heating elements compensated roller glass absorbs heat after the average temperature. For this reason, the measured temperature is generally higher, than the measured temperature of the upper part to higher, so the temperature of tempering furnace upper generally set to be higher than the lower temperature. Below, the author give a temperature control example, if we in the production, so that the glass from the heating furnace to quench chamber temperature increased by 10 DEG C.

Second, select the reasonable heating time when the laser lens material is produced. Tempering furnace heating power is certain, usually set the heating time (the electric furnace heating time) about per mm glass thickness of 35-40 seconds. For example: 6mm thickness glass heating time is about =228 6 x 38 seconds seconds. This method adapt to the thickness is less than 12mm thick glass ordinary flat glass. When the thickness of the glass in the 12mm-19mm and calculation method of the heating time is 1mm thickness of glass is about 40 to 45 seconds. The production of curved tempered glass, heating time per mm of thickness of glass increased by 2.5-5 seconds. With slotted holes or glass, heating time to this calculation method on the 5%. With sharp (less than 30 DEG) glass and gray glass heating time in this method to 2.5%. Below the author cite examples of a furnace temperature control, to the interpretation of the heating temperature and heating time, if we in the production of 6mm tempered glass, heating temperature for 705 DEG C, heating time of 215 seconds, to make the glass from heating furnace to quench chamber temperature is increased to 10 DEG C, two kinds of method to realize: the first method is to raise the furnace temperature 10 degrees Celsius; the second method is increasing the heating time and the temperature of the furnace. Remain unchanged. Note: nearly glass temperature tempering temperature before the slower heating rate, we need to understand such a basic principle: if the furnace temperature changes of a few degrees set, we also want to the glass temperature also changes in the same temperature, it is necessary to change the heating time + T seconds to make glass out of the furnace temperature in + T seconds of time remains unchanged.

Third, to achieve the uniform heating, glass in the layout is also very important. The reasonable arrangement of the discharge piece is mainly to ensure the uniformity of the longitudinal and the transverse load in the electric furnace, that is to say, the arrangement of the piece of glass and the interval time of each furnace should be uniform. We want to understand from the heating furnace to quench chamber process temperature rules, we must make clear glass plate is arranged depending factors: when the glass moves back and forth along the furnace, areas adjacent to the edge of the glass roller are prone to overheating, this kind of phenomenon between the two pieces of glass roller surface is easy to happen. In the actual production, if the glass plate in tempering furnace has been in the same place slices are arranged forward movement, each roller temperature difference is relatively obvious, the position change, the glass will in quench chamber in heating furnace is coved or broken. In order to get the best tempering effect. We want to remember to put films of note: in order to avoid the gap between vertical glass plate lead to quit the furnace temperature is too high, put a piece of glass plate is put on the stage is more reasonable, easier to maintain consistency of roller temperature, that put films longitudinal gaps appear, under a put films to fill this void. In addition, in the long longitudinal gap (more than equal to one-half) laid down in a furnace of glass and its adverse effect to than in the longitudinal length of glass is more obvious. This is because the gap of the high temperature in the heating start is affected, to have sufficient time to make the temperature balance down.

Fourth, as far as possible to the glass cooling to cool the fastest, the cooling rate depends on other properties in the thickness of the glass and glass, two surface cooling glass to be balanced; the ideal cooling medium stage tempering process is dry cold air, the unit area about the cooling capacity is certain, so the cooling capacity 5mm glass needed is equal to two times of 6mm glass, 12mm glass cooling capacity also need is only half of 10mm glass, for this reason, considering the influence of the thickness of the glass to the cooling speed, so you can say: 5mm glass cooling rate is four times of 6mm glass, 12mm glass cooling rate only 6mm 1/4.

Fifth, laser lens material in the process of tempering glass or stop the movement, the glass surface can not be scratched and deformation of the traces left behind. The campaign includes glass enclosed in the heating furnace of hot rocking motion, heat pendulum motion is in order to make the glass surface of each part of the heating uniform; also includes glass in air cooling cold pendulum motion, cold pendulum motion is for even tempered glass, ensure that the glass broken blocks are uniformly. For the quality of the original plate glass requirements, the original plate glass can not be a layer of miscellaneous, blasting edges, scratches, bubbles, etc., these conditions can cause the glass in the air.