Aircraft skin, generally speaking, is a layer of metal skin on the outer surface of the aircraft, and aluminum alloy skin is the most common.

The function of the aircraft skin is to maintain the shape of the aircraft so that it has good aerodynamic characteristics. After the skin bears the aerodynamic action, the force is transmitted to the connected fuselage wing skeleton, and the force is complex, and the skin is in direct contact with the outside world, so it not only requires the skin material to have high strength and good plasticity, but also requires a smooth surface and high corrosion resistance.

Aircraft skin, aluminum alloy is widely used, aluminum alloy sheet is used, and it has undergone various processes, such as rolled plate → annealing→ cleaning→ solution treatment→ stretch forming→ aging→ machining → surface treatment, etc.

The aluminum alloy sheet is made into various shapes of skin, and then the skin is riveted to the aircraft with rivets, and then painted on the skin, which constitutes a variety of beautiful shapes and all kinds of beautiful aircraft.

Obviously, the skin of the Y-30 transport aircraft subverts the traditional process and takes a big step, not only with lower manufacturing costs, but also with better performance and quality.

The skin of the Y-30 transport aircraft is made of "Hercules" material, and then it is not riveted with rivets, but with screws and nuts with international patents from Tianfeng Technology Company, the kind of self-locking screws and nuts that never loosen.

"Hercules" material has been widely used, and its material grades have been several, different uses and requirements, using different grades of "Hercules" materials.

For example, the "Hercules" material used to make the skin material of the Y-30 transport aircraft has excellent plasticity and corrosion resistance while having excellent strength, and it is not a problem to use it for decades.

In addition, because the skin is fastened with screws and nuts, it is not only more beautiful, but also easy to disassemble and maintain.

Traditional aircraft skinning. The riveting process is used to fix the skin in one go, and if the skin is damaged, its repair is a big problem.

On the Y-30 transport fuselage, this is no longer a big problem, it can be disassembled and replaced directly. Self-locking screws and nuts use special tools and are very face-to-face and easy to remove.

Seeing that Li Tianfeng wanted to see the design of the "Hercules" material skin, Lei Yong opened another folder and said: "At present, the Yun 30 skins that have been designed are all here. ”

Using dedicated drawing software, these skins are all three-dimensional design drawings, which can be viewed in all directions and 360 degrees with the help of design drawing software. Very convenient.

After looking at several design drawings in a row, Li Tianfeng said with satisfaction: "Mr. Lei, the design is good, the use of 'Hercules' material aircraft skin, the production and manufacturing cost of the Y-30 transport aircraft will drop a lot, and it is more suitable for mass production." ”

This is a technological change, a change from tradition, in Li Tianfeng's plan. Not only is the exterior skin of the Y-30 transport aircraft made of such processes and materials, but the Y-25 transport aircraft is naturally the same.

Other than that. In the future upgrade of J-30 and J-18 fighters, it is also possible to change the skin of its aluminum alloy.

It is believed that after the J-30 and J-18 fighters adopt this new skin, the radar reflection area will be further reduced, and the mass of the whole aircraft is estimated to be reduced by more than 5%.

Here in Lei Yong, Li Tianfeng not only looked at the structural design of the Y-30 fighter. I also looked at the skin design and was satisfied with the overall design progress.

Li Tianfeng's recent focus is naturally on the design and development of the Y-30 transport aircraft and the Y-25 transport aircraft, and as for the J-30 and J-18 fighters, they have gradually entered the fast lane of production and manufacturing. Some small improvements and small improvements in the design naturally do not need to be cared about by Li Tianfeng.

With the delivery of J-18 fighters to Pakistan, the long-standing military balance between India and Pakistan has been broken, and the Indian side has also begun to take measures.

After Li Tianfeng came back from the Chengnan base, he received a call from Zhang Haiping from the capital in his office.

Zhang Haiping said on the phone: "Mr. Li, we have delivered several J-18 fighters to Pakistan." ”

Li Tianfeng said: "Seven have been delivered, and in a few days, the eighth J-18 fighter will also be delivered to the Pakistani side." ”

The J-18 fighter production line produces and manufactures two types of J-18 fighters at the same time, the military-specific type and the export type, and the export type is currently mainly delivered to Pakistan.

It is estimated that in another one or two months, the export-oriented J-18 fighter will begin to be delivered to the second international user, and several other countries, such as Brazil, Argentina, the United Arab Emirates and other countries, are urging the delivery of the J-18 fighter.

Zhang Haiping said: "It's really fast, 7 aircraft have been delivered." ”

Li Tianfeng said: "When the J-18 fighter enters the stage of mass production and manufacturing, the delivery of the export-oriented J-18 fighter will be greatly accelerated, and it is not impossible to deliver it to two or three users at the same time every month." ”

"Hmm." Zhang Haiping nodded and said: "I believe in your mass production speed, but with the start of batch delivery of J-18 fighters to Pakistan, the military balance between India and Pakistan for many years will also be completely broken." ”

The J-18 fighters are so good, and Pakistan, which is equipped with a large number of J-18 fighters, will definitely have a great upper hand in military strength, especially air force.

Li Tianfeng said: "We also know that the military balance between India and Pakistan will be broken, and when we signed an export contract with Pakistan for J-18 fighters, the Indian side also raised a strong protest." ”

Zhang Haiping said: "The balance has been broken, however, India has not sat still, the latest news, not long ago, India and the United States signed an arms sales contract for 180 F16 fighters, in order to strengthen their air force, narrow the gap with Pakistan." ”

In the face of Pakistan, which is about to install a large number of J-18 fighters, what India can do is to purchase a large number of American F16 fighters, and there are still a lot of them, and they have purchased as many as 180 aircraft.

Li Tianfeng said a little worriedly: "Minister Zhang, the Indian side has purchased so many F16 fighters, India and Pakistan are completely in a military competition, will there be a war in the future." ”

Li Tianfeng was really unfortunate to say that not long after, a war broke out between India and Pakistan, but it was only a local war, and no third country participated.

Zhang Haiping said: "The matter between them is not something we should consider, if it really goes wrong, it is also a matter between them, under the current environment, a large-scale war cannot be fought." ”

Zhang Haiping, a military personage, said that a large-scale war could not be fought, but Li Tianfeng was convinced, and Li Tianfeng said in his heart, if you want to fight, you can fight, and then you can see what kind of battle result the J-18 fighter will have in the face of the F16 fighter.

……….

Tianxin City, Hexi base.

Tianfeng Technology Company's Hexi base, in the whole Tianxin City can be described as famous, not only the factory area is huge, the number of employees reached nearly 20,000, and the output value is not small, last year the entire output value of 7, 80 billion.

Here, in addition to the turbofan 16, turbofan 17, and turbofan 18 engines, there are also the famous turbofan 21 engines.

The turbofan 21 engine, the world's most advanced, the most performing, and the most economical turbofan engine with a large bypass ratio, is widely used in various regional airliners or business jets, private jets and so on.

Needless to say, the turbofan 21 engine has been steadily occupying more than 80% of the engine share in Bombardier and Embraer.

In the entire international regional airliner and business jet engine market, the turbofan 21 engine has also reached more than 60%, that is, two-thirds of the share.

Li Tianfeng has full strength, and the re-development is as good as the turbofan 21 engine, and the thrust is greater for the civil airliner engine, but Li Tianfeng has not done so for the time being.

There are turbofan 16 and turbofan 17 are still enough to compete with Rolls-Royce, GE, Pratt & Whitney and other companies, and in the international passenger aircraft engine market, it has basically maintained a situation of four points in the world.

The turbofan 17 engine can be used in the 100-seat class or 150-seat class, and the turbofan 16 has more thrust and can be used in the 150-seat class or 200-250 seat class passenger aircraft.

For large trunk airliners with 300 seats or more, Tianfeng Technology has not yet launched its engine, and it is still the world of Rolls-Royce, GE, Pratt & Whitney and other companies for the time being.

However, Tianfeng Technology has now launched the world-renowned turbofan 30 engine.

The turbofan 30 engine, one of the world's largest thrust engines with large bypass ratio, is also the most fuel-efficient engine per unit power, and the most economical engine.

If a giant like the Airbus A380 were powered by a turbofan 30 engine, it would be much less fuel-efficient than today's engines, and the average fuel consumption per passenger per kilometer flown would be lower than that of driving a family car.

Such an engine with excellent performance and such economy is currently being manufactured at the Hexi base in Tianxin City, and has entered the stage of comprehensive trial production of parts.

In September last year, Tianfeng Technology Co., Ltd. held a global press conference for the turbofan 30 transport aircraft in Beijing, and then, this engine entered the design and development stage, and now, it has entered the comprehensive trial production of parts.

Large casing machining center.

Yang Xianfeng and several high-level executives from the Hexi manufacturing base, as well as Sun Xiaoping and Qiu Wen'an from Songzhou City, everyone is talking and laughing, and they are entering this large casing processing workshop.

In the processing workshop of nearly 20,000 square meters, it is in full swing, and all kinds of large casings are produced here.

Turbofan 16, turbofan 17 and other engines, and even the fan casing of the turbofan 21 engine, as a large bypass ratio turbofan engine, there is no doubt that its fan casing is very large.

The fan casing of the turbofan 30 engine is a big guy, very conspicuous, and it looks super huge on the large inspection platform in the inspection area.

Soon after entering the workshop, Sun Xiaoping saw this big guy from a distance, Sun Xiaoping and Qiu Wenan glanced at each other, and couldn't help but speed up their pace.

………

Today's second update is sent, good night everyone. (To be continued.) )