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How to avoid the impact of tempered furnace ceramic roller track on the surface of tempered glass
Release time:
2021-04-16
Ceramic rollers are a crucial component of tempering furnaces, primarily responsible for supporting and conveying the glass undergoing processing. Issues with the ceramic rollers can significantly impact the glass surface. Therefore, during daily tempering furnace production, several aspects should be addressed to eliminate the impact of quartz ceramic rollers on the tempered glass surface.
I. Introduce Gas into the Tempering Furnace Heating Furnace
Introducing gas into the heating furnace helps maintain the surface condition of the glass and rollers. However, the amount of SO2 gas added must be strictly controlled. Adding too much can lead to sodium sulfate caking on the roller surface, resulting in small transparent pits and other quality issues on the glass surface. Too little gas prevents the formation of a protective surface film on the rollers, hindering normal production. Generally, 1-2 hours after the temperature rises, using waste glass to rub and refine the roller surface can reduce glass scratches and meet the production requirements of general glass.
II. Adjust Tempering Furnace Process Parameters
First, appropriately lower the furnace temperature and increase the heating time. Since the tempering process requires the glass to be heated to a certain temperature, this adjustment can only be made while meeting the tempering process requirements and cannot be drastically adjusted.
Second, reduce the line speed of the glass in the furnace. The glass undergoes continuous reciprocating motion during heating, frequently accelerating and decelerating. Reducing the line speed correspondingly reduces the glass's acceleration, minimizing friction and slippage between the glass and rollers due to inertia, thereby reducing surface scratches. However, the line speed cannot be reduced too much to avoid glass deformation affecting its flatness.
III. Other Precautions
1. Since glass surface damage occurs every time the tempering furnace cools down and then heats up again, the roller track needs to be re-rubbed with glass, which wastes manpower and material resources and reduces production efficiency. It is recommended to maintain continuous production as much as possible and reduce furnace shutdown operations.
2. During production, due to the continuous introduction of a large amount of gas, sodium sulfate caking easily forms on the roller surface. When transparent pit marks are found on the glass surface, the furnace should be stopped immediately to clean the roller track.
3. Because the surface of embossed glass is uneven and causes certain damage to the roller surface, it is recommended to avoid tempering embossed glass as much as possible. If tempering is necessary, the roller track must be re-rubbed with glass after tempering.
4. Each time the rollers are cleaned, the bearing surface and bearing seat surface oil stains should also be cleaned to ensure that all rollers are on the same plane and reduce the displacement error between rollers.
Gas drop occurred on the outer glass roller due to a conflict during production.
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