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[China Glass Network] As a modern mode of transportation, high-speed rail has become a necessity for the public life. Then, when we were riding the high-speed rail, did we find out that no matter how fast the train traveled, we didn’t feel dizzy when we looked at the distant view from the window; did we think that if there were pebbles flying over, the window would not Will it be smashed? When the two cars meet, the pressure is so big, why is the window not broken? Is the high-speed rail glass used for foreign products or domestic independent brands? These mysteries behind the high-speed rail glass, let us crack together.
Secret one: Why don't you look at the window and don't stun the scene?
The same refractive index of the glass
The front window of the high-speed rail car belongs to the structure of hyperboloid. The glass itself has many layers, and the layer and the layer maintain a high degree of anastomosis, so that the optical effect of the glass is not affected, and the object is not deformed. The high-speed side window glass has excellent visual effect, which improves the error of the thickness and flatness of the glass, and achieves the homogeneity of the glass material composition, ensuring the same refractive index everywhere, and the viewing object will not be deformed, and the glass is not the same as the glass. The visual effect looks comfortable and does not dazzle.
However, due to the existence of certain optical distortion, the ordinary glass will be deformed through the glass, and at the same time, the superimposed motion will produce a superposition of speed, causing glare and causing dizziness. The high-speed trains of the EMU trains have good shock absorption performance, irregular bumps are reduced, the scenery is shaken, the operation is very smooth and quiet, and the passengers feel slow. The passengers will not feel dizzy when they sit for a long time.
Secret 2: Will the pebbles be broken when the high-speed rail runs?
The car window can not be resisted to withstand the impact of 355 kilometers of aluminum bullets!
At present, the high-speed train has a higher running speed of 380 km/h. High speed means high risk. The high-speed train will compress the surrounding air and greatly improve the air resistance. This makes the train pass through as a whole. The brick wall, the resistance can be imagined. Therefore, in order to ensure the safety of the train, the more fragile windshield in the train must be unstoppable.
High-speed rail glass impact test
The above video is the impact test of high-speed rail glass. The 1kg heavy aluminum bullet rushes to the glass on the high-speed train at a speed of 355 kilometers per hour. Although the ground is full of broken glass, the window is covered with a large hole, but the glass is broken. And there is no penetration and unboxing, there is no glass slag splash behind the window, and the impact area is still very strong by hand.
High-speed rail pays special attention to the high-speed impact performance of glass materials, which is also a threshold for the production technology of glass processing enterprises. For example, the CRH380A EMU that is put into operation requires that the windshield can withstand 1kg of aluminum bomb and can not be penetrated at a speed of 540km/h. Side window glass requires good visual performance, safety performance, energy saving performance and environmental performance.
Revealing three: Why is the window intact when the two cars meet?
Side window has high mechanical strength and impact strength
The China Standard EMU, which will be put into operation on July 1 this year, is referred to as China “Standardâ€. It is a high-speed EMU designed and manufactured with Chinese standards as its leading design. It has comprehensive independent intellectual property rights and represents the higher standards of the world EMU technology. It is the main model for China's high-speed rail to go out. In the test of the car on the Zhengxu Passenger Dedicated Line, at hourly
The 420-kilometer rendezvous speed has refreshed the train's high-speed test record, which is also the world's first high-speed train meeting test on the actual running track.
China Standard EMU
Such a high speed of intersection is a huge test for the quality of high-speed rail glass, highlighting the overall technical level of China's standard EMU. Why do you say this, because when two trains will enter the tunnel, the train will create a very high wind pressure between the trains and between the train and the tunnel, which will cause a great impact on the side windows of the rendezvous vehicles. There may be a window breaking accident. Before the speed increase in 2007, the long-distance running on the rails was a 160-kilometer-speed car. When the two cars met, there was a window with a speed of 200 km/h and the speed of the car with a speed of 160 km per hour. The accident that came down. Therefore, the side windows must also have high mechanical strength and impact strength. In addition, when the window is broken when it is damaged by external force, it is also required that the fragments generated by the glass must form honeycomb-shaped small obtuse-angle particles, the outer glass is peeled off without debris, and the inner glass is intact.
Secret 4: Is the high-speed rail glass imported or domestically produced?
The core technology and products are completely localized. Domestic enterprises occupy 90% market share.
Said so many places of high-speed rail glass magic, then in the end is the foreign products or domestically produced, how many Chinese companies have mastered the core technology of high-speed rail glass? These are topics that netizens are very concerned about.
The high-strength windshield used for high-speed trains with speeds above 300Km/h before 2007 can only be imported from Saint-Gobain of France and ISOCLIMA of Italy. The delivery period is long and the cost is extremely high.
In 2007, in order to break the monopoly of international glass giants, the technical backbone of the organization carried out the technical research on rail safety glass. In order to apply to high-speed trains with a speed of more than 300 kilometers per hour, the three high-speed rail windshields must solve the problem: First, the glass structure needs to be more optimized. Through the computer-aided control precision molding technology, it can meet the needs of the urban arcade super-radial panoramic streamline design, thereby improving the optical performance of the glass. Second, the chemical tempering process must have a qualitative breakthrough, which is the key to determine the mechanical strength of the front window glass. The third is to design a computer-controlled heating wire wiring technology, heating uniformity after power-on to meet the relevant standards.
The road to scientific research is bound to be a tortuous one. Only by continuous technological innovation can enterprises go further, and China's high-speed rail can sail to more countries, and China's intellectual creation can be realized soon.
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