Study on production performance and inspection points of tempered glass
[China Glass Network] Introduction
Tempered glass is currently used in a wide range of safety glass forms and is widely used in construction, automotive, home improvement and home appliances. With the continuous development of tempered glass technology, the application field of tempered glass continues to expand, people's requirements for the quality of tempered glass products continue to increase. Therefore, attention should be paid to the production performance and quality inspection of tempered glass to ensure the quality of tempered glass.
1 production performance requirements of tempered glass
When producing tempered glass, it should be ensured that the heating is carried out to the required temperature. In the process of producing tempered glass, on the one hand, it should be ensured that the tempered glass is heated to the required temperature to ensure that the temperature of each part of the glass surface is uniform, and that there is no large temperature difference between the surface of the tempered glass and the middle. When heating the tempered glass, the temperature inside the electric furnace should be controlled according to the load condition of the electric furnace to ensure the heating temperature of the tempered glass. When setting the heating temperature of the electric furnace, the thickness of the tempered glass should be fully considered. In order to make the tempered glass thinner, the heating temperature of the electric furnace should be higher. In order to make the tempered glass thicker, the electric heating temperature of the electric furnace should be lower. When controlling the heating temperature of the electric furnace, the operator should understand the relationship between the temperature of the electric furnace and the heating time and the change of the temperature of the electric furnace to the thickness of the glass to ensure the glass tempering performance. When heating the glass, the heating time of the tempered glass should be reasonably controlled, and at the same time, the placement of the glass of each furnace and the gap time of each furnace should be ensured to ensure uniform heating of the tempered glass. On the other hand, the tempered glass should be cooled at a faster cooling rate. When cooling the tempered glass, dry air should be used as the cooling medium. According to the actual thickness of the glass and other properties of the glass, the cooling time should be properly controlled and ensured. Cooling balance of both sides of tempered glass. In addition, during the tempering process, it should be ensured that the glass keeps moving. In the process of tempering, attention should be paid to the thermal oscillating motion to ensure that the glass is heated evenly. At the same time, it should pay attention to the cold pendulum movement to ensure uniform glass tempering, and at the same time ensure that the glass surface does not appear scratched and deformed during the tempering process. trace. In the production process of tempered glass, there is a certain requirement for the quality of the original plate glass. The original plate glass used for the production of tempered glass is strictly prohibited from having quality problems such as layer impurities, blasting, scratching and bubbles, and the tempered glass is windy during the production process. Cold crushing ensures the quality of tempered glass.
2 tempered glass inspection points
(1) Key points for dimensional inspection and deviation testing. When the thickness of the rectangular flat tempered glass is 3, 4, 5, 6 mm, when the length of the rectangular tempered glass is less than 1000 mm, the side length deviation should be controlled within ±1-2 mm; the length of the rectangular tempered glass is within 1000-2000 mm. When the length of the rectangular tempered glass is within 2000-3000mm, the side length deviation should be controlled within ±4mm; when the length of the rectangular tempered glass exceeds 3000mm, the side length deviation should be controlled. Between ±5mm. When the thickness of the rectangular flat tempered glass is 8, 10, 12 mm, when the length of the rectangular tempered glass is less than 1000 mm, the side length deviation should be controlled within ±2~3mm; when the length of the rectangular tempered glass is within 1000-2000mm, The side length deviation should be controlled within ±3mm; when the length of the rectangular tempered glass is within 2000-3000mm, the side length deviation should be controlled within ±4mm; when the length of the rectangular tempered glass exceeds 3000mm, the side length deviation should be controlled at ± Between 5mm. When the thickness of the rectangular flat tempered glass is 15mm and the length is less than 3000mm, the side length deviation should be controlled within ±4mm; when the length exceeds 3000mm, the side length deviation should be controlled within ±5mm. When the thickness of the rectangular flat tempered glass is 19mm and the length is less than 2000mm, the side length deviation should be controlled within ±5mm; when the length is within 2000~3000mm, the side length deviation should be controlled within ±6mm; rectangular tempered glass When the length exceeds 3000 mm, the side length deviation should be controlled within ±7 mm. For the length of tempered glass with a thickness exceeding 19mm, the error between the supplier and the buyer shall be agreed upon. The size and tolerance of other shapes of tempered glass shall be agreed upon by both the supplier and the buyer.
(2) Inspection points of thickness and deviation of tempered glass. When the nominal thickness of tempered glass is 3, 4, 5, 6mm, the deviation of the allowable deviation shall be controlled within ±0.2mm; when the nominal thickness of tempered glass is 8,10mm, the deviation of the allowable deviation shall be controlled. Between ±0.3mm; when the nominal thickness of tempered glass is 12mm, the deviation of the allowable deviation should be controlled within ±0.4mm; when the nominal thickness of tempered glass is 15mm, the deviation of the allowable deviation should be controlled at ±0.6 Between mm; when the nominal thickness of tempered glass is 19mm, the deviation of the allowable deviation should be controlled within ±1.0mm; when the nominal thickness of tempered glass exceeds 19mm, the deviation of the allowable deviation should be agreed upon by both the supplier and the buyer.
(3) Inspection points for bending and impact resistance of tempered glass. When testing the toughness of tempered glass, the curvature of the plane tempered glass should be controlled within 0.3% of the bow shape, and the waveform should be controlled within 0.2%. When testing the impact resistance of tempered glass, six tempered glass shall be taken for testing. The number of damaged samples shall not exceed one, and more than or equal to three shall be unqualified. When the number of damages is 2, another 6 pieces are taken for testing, and all the samples must not be damaged to pass.
(4) Key points for quality inspection of tempered glass. When testing the appearance quality of tempered glass, attention should be paid to the inspection of cracks and missing corners of tempered glass. Once the tempered glass is cracked and notched, it is unqualified. In the tempered glass edge detection, each piece of glass is allowed to have a length of less than 10 mm per meter length, and the depth from the edge of the glass to the surface of the glass plate is less than 2 mm, and the depth from the surface of the glass to the thickness of the glass does not exceed the thickness. The number of bursts of 3 is only allowed to have 1 defect number. In the case of tempered glass scratch detection, scratches with a scratch width of less than 0.1 mm are allowed, and four scratches with a length of less than 100 nm are allowed per square meter; scratches with a scratch width of more than 0.1 mm, per square Four scratches having a width between 0.1 and 1 nm and a length within 100 nm are allowed to exist within the meter area.
(5) Key points for the inspection of tempered glass fragments. When testing the state of tempered glass fragments, four tempered glass should be taken for testing. For flat tempered glass, when the state of the debris is detected, the tempered glass with a nominal thickness of 3 mm or a nominal thickness of 15 mm or more, the number of smaller pieces of each tempered glass sample in any 50 mm × 50 mm area should be controlled within 30 pieces. For tempered glass with a nominal thickness of 4-12 mm, the number of smaller pieces per tempered glass sample in any 50 mm × 50 mm area should be controlled within 40 pieces. For curved tempered glass, when the state of the debris is detected, the tempered glass with a nominal thickness of 4 mm or more, the number of smaller pieces of each tempered glass sample in any 50 mm × 50 mm area should be controlled within 30 pieces. At the same time, when performing the horizontal state detection of the tempered glass, a small amount of the elongated fragments having a length of 75 mm or less is allowed to exist.
3 Conclusion
In the process of producing tempered glass, in order to ensure the performance of tempered glass, it is necessary to ensure that the tempered glass is heated to the temperature requirement, and at the same time, the tempered glass is cooled at a relatively fast cooling rate, and the movement during the tempering process is ensured. When conducting tempered glass inspection, attention should be paid to dimensional inspection and deviation inspection, thickness and deviation inspection, bending and impact resistance inspection, appearance quality inspection and debris inspection to ensure the quality of tempered glass.
China Cylindrical Lenses,Plano Convex Lenses manufacturer, choose the high quality Fused Quartz Plano Convex Lenses,Diameter Fused Silica Optical Lenses, etc.Founded in 2014, Bena was co-founded by several experienced engineers who have more than 10 years of optical design, process, production and test. We provide customization service for high precision (rms = 1/100λ, λ=632.8nm), large diameter plane mirror (>500mm) and aspherical lens, as well as professional spherical lens (such as Optical Domes with diameter 280mm), involving different materials including K9, Silicon, Sapphire, SiC, glass ceramics, fused silica, and other various optical glasses, and we can also deal with the nickel-phosphorus alloy surface on different substrates.
Cylindrical Lenses,Plano Convex Lenses,Fused Quartz Plano Convex Lenses,Diameter Fused Silica Optical Lenses
Changchun Bena Optical Products Co., Ltd , https://www.benaoptic.com