How many levels does it take to produce a piece of

How many passes does it take to produce a piece of car glass

glass is an important functional and safety part of the car. It protects us from the wind and rain, and allows us to observe the road conditions through the glass when driving. Therefore, what are the inspection points and maintenance of a qualified and high-quality automotive glass plastic tensile testing machine before use? It is particularly important. Next, let's take a look at how automotive glass "passed five passes and killed six generals" before leaving the factory

the first level: raw material quality

a piece of high-quality automotive glass cannot be separated from high-quality raw materials - float glass. Fuyao Group currently has 11 float glass production lines, each of which is equipped with testing equipment. The common quality defects of float glass, such as bubbles, stones, nodules and so on, have nothing to hide in front of this equipment, and the glass quality is monitored before it goes offline. If not, its life will end in the first level

the second level: production process control level

a piece of high-quality automotive glass must pass many tests and personnel checks in the production process, according to the government of the State Forestry Administration. For example, the "first, middle and final inspection" refers to the inspection of glass before, during and after production, including appearance, size, etc. for key projects, the factory also needs to conduct sampling inspection

eyes: pockmarks, scratches, bubbles, etc., are all OK

props: unqualified size - unable to load, unqualified surface - look at the deformation of the scenery

inspection performance: product stress affects the compressive strength of the glass, resistance performance affects the defrosting effect of the rear windshield, and good optical performance is an important index to ensure driver safety. 4. Before loading the test piece

third level: performance test level

for glass products, they can only be delivered after strict laboratory tests

mechanical test:

can the windshield become the first line of defense for safety if foreign objects fly in the face on the highway? At the moment of the accident, once the passengers come into contact with the broken glass, will it cause secondary injury to people? Mechanical test is to test the performance of the glass when it is impacted. For example, the following experiment is to simulate the state of people after contacting the front windshield when the vehicle is severely impacted

glass meeting safety standards:

when laminated glass is impacted, the glass and the intermediate film must be bonded to prevent personal injury caused by debris splashing; When people hit, the glass must be broken, otherwise people will be like hitting an iron plate, causing the head to absorb all the impact energy; At the same time, the glass cannot be penetrated to prevent secondary injury. When the toughened glass is broken, the number of fragments in any 50mm*50mm square is not less than 40 and not more than 400. Too large or too small glass fragments will cause harm to people

salt spray test:

in coastal areas, high temperature and humidity, especially test the service life of metal materials such as nail posts and bases on automotive glass. Under the temperature of 35 ℃, salt spray test simulates the extreme environment of high temperature and high humidity with high concentration salt water (5% sodium chloride salt water) solution, so as to determine the corrosion state of metal parts on automotive glass

environmental testing:

in reality, there are other extreme vehicle environments: tropical coastal areas with high temperature and humidity, extremely hot and dry deserts, severe north and south poles, etc. We simulate extreme climate changes in the laboratory, constantly changing extreme temperature/humidity (for example, at -40~90 ℃ ~120~-20 ℃, constantly cycling), to determine some changes in the metal parts, components and products themselves

defrosting experiment:

in winter, there are many rainy and snowy weather. What if the car glass in high latitude areas is frosted and frozen? The defrosting experiment mainly tests the defrosting function of automotive glass in winter. Through the power on test, the defrosting effect achieved within the specified time can be observed visually

optical inspection:

automotive glass requires good optical performance to ensure good visibility of the driver. Optical inspection is to determine whether the optical performance of the spring tension testing machine is qualified by simulating the deformation of objects outside the window through the window during the driving process of the car. Deformation will cause the circle you see to become an ellipse and the straight line to become a wavy line

tip: the deformation of the car will also be affected after the film is applied

in fact, the inspection items of automotive glass are far more than this, and the inspection methods adopted are also diverse. Of course, the ultimate goal of all inspections is to ensure quality