Notices For Using Tempering Glass Furnaces
There are a number of important notices to be aware of when using a glass tempering furnace. These include concerns about conveyors, magnetic clutches, heating time and quench section rollers. Using a glass tempering furnace should follow these guidelines to ensure safe and efficient production. Glass tempering furnace works a bit like cooking – you'll have the newest and greatest equipment in your kitchen, but the food can still end up bad. To be an excellent cook takes far more than having the simplest equipment – it’s about understanding the processes. you've got to understand the ingredients and techniques also because the equipment. Automation makes things a touch easier. this is often what we attempt to do with our glass tempering furnaces – to automate a number of the processes to realize more consistent quality and to minimise operational mistakes. Nowadays, glass tempering furnaces come equipped with sensors, allowing the operator to tug data and measurements.
Pay Attention To The Conveyors
Conveyors for Tempering Glass Fuers are designed to move the glass sheet load in a steady and controlled manner. The furnace's length should be equal to the length of the cooling and quench sections, so that the same stroke length of the glass sheet is achieved during the process of quenching and cooling. During the loading process, the heated sheet glass load is transported along the conveyor to a quench unit. The quench unit is designed to convey the sheet glass load between the upper and lower banks of nozzles. The rollers in the upper bank are engaged with the drive chains during the index cycle, while the rollers in the lower bank are lifted into engagement with the drive chains when the glass is ready for the unloading process.
The conveyor is driven by a drive mechanism and includes elongated rollers 44. These rollers are mounted in an elongated furnace housing. A drive chain is attached to the roller ends, which are supported by immediate portions of the glass. The conveyors remain in frictional engagement with the drive chains after the index cycle is complete. The drive chain of a glass tempering furnace's load and unload stations actuates switches. These switches determine the degree of oscillation of the glass within the furnace, its acceleration and deceleration rates, and when to begin and end an index cycle. Tempering glass furnaces are generally equipped with a continuous-action conveyor that moves glass sheets in an oscillating motion. This oscillation occurs while the glass sheet is being heated, and it prevents the glass sheet from overheating.
Heating Time of Tempering Glass Furnace
Heating time for tempering glass furnaces can be determined by a few factors. The temperature at which the glass will be tempered can affect the amount of energy used per square meter. Using a thermostat will help you determine the right heating time for the glass. If the temperature is too high, the glass may deflect. To prevent this, adjust the temperature of the furnace so that the glass is cooled gradually. Tempering glass furnaces can increase the level of tempering achieved by reducing the thickness of the glass. Increasing the temperature will result in a greater difference in surface temperature between the glass and its liner. When the glass is thin enough, the quenching zone will be much shorter.
In addition, higher temperatures can improve the strength of the glass. Glass of two millimeters thick requires a tempering temperature above 640deg C. In roller-hearth furnaces, this temperature is too high. Higher temperatures result in more compression of the glass surface, which provides greater strength. The roller-hearth furnace is the easiest to adjust, because the heat is transferred directly to the glass. This type of furnace also provides a symmetrical temperature profile. When the temperature profile is symmetrical, the glass retains its straight shape in the furnace. This is because gravity tends to keep the glass flat in contact with the rollers, and the thermal stress forces must be greater than the resistance to gravity.
Problems With Quench Section Rollers
Using rollers in quench section of tempering glass furnaces can cause problems. Often, rollers cool the glass unevenly, leading to white haze on the surface and uneven quenching pressure. This in turn can affect the appearance of the strain pattern. Rollers can also cause problems with temperature. The wrong temperature can cause premature fracture, particularly at the edge. This can reduce productivity and result in poorer glass quality. To prevent this, you must control quench temperature. Also, rollers must have a proper spring tension to prevent the glass from deforming.
Moreover, a poorly designed quench fixture or jig can also cause distortion during hardening. Low-alloy steels, for example, have a low yield strength at hardening temperatures and are prone to distortion under their own weight. Hence, it is recommended that long parts are heated in a vertical furnace and quenched with vertical agitation of the fixtures. A roller hearth tempering furnace includes quench section and conveyor drive belts. It also includes a continuously oscillating blast head and a rotary conveyor with individual doors. The blast head is fitted with air jets that are perpendicular to the curved surface of the glass. These air jets may be arranged in staggered rows of parallelograms.
Quench section rollers are an important piece of equipment in tempering glass furnaces. A roller can significantly increase or decrease the heat-treated part's load-carrying capacity. A roller can also increase or decrease the optical quality of the glass. In addition to improving load-carrying capacity, rollers can prevent quench cracking and other problems. These problems are usually caused by a faulty heat-treatment practice, which can lead to part defects and quench cracking.
Keeping Temperature Constant
There are two common ways to heat glass in tempered glass furnaces. One type of furnace uses a continuous tempering line, which moves the glass load in one direction. The speed of the motion is consistent throughout the length of the furnace. The other type uses an oscillating line, which moves the glass load back and forth. The latter method is used when convection blasting is being used. One common problem is the formation of white haze on the surface of tempered glass. This is caused by a high temperature in the lower heating zone. In order to prevent this, the lower temperature must remain constant while the upper temperature is raised. Otherwise, the glass may develop a scratch on its surface.
Keeping temperature constant when using tempered glass heating furnaces is important for a number of reasons. If the bottom temperature of the furnace is too high, the glass will take too long to heat. Another problem is that the swing speed of the ceramic roller is too fast. This can cause the edge of the glass to bend upward. Electric melting is the most energy-efficient method. It also eliminates the need for batch materials that are carried away in flue gases. Additionally, electric melting can produce products with a 70 to 80 percent thermal efficiency compared to fossil-fuel firing, which requires at least 40% efficiency. Electric melting furnaces are available as cold-top or specialty furnaces. Keeping temperature constant when using tempered glass heaters can help avoid the appearance of wave patterns. This phenomenon occurs when tempered glass is less than 3 mm in thickness. If the temperature increases past 640deg C, the glass will develop a noticeable wave pattern. This pattern is not a desirable quality for an object that requires high strength. The problem increases with the thickness of the glass.
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