Who has ever suffered from this kind of treatment?

Coldly surrounded by dozens of strong men in black, these mechanics and pilots had inquiring expressions written on their faces similar to those of netizens.

The object of exploration is naturally the backbone of the heart.

Chang Yule was also stunned, he had never encountered such a scene in his life.

"For... Why?" the two professors from the Tianfu City Flight University hesitated to speak, and the aerospace major had exposed them to similar confidentiality agreements in the past. But when that kind of agreement was signed, it was clear that there were not dozens of strong men around.

"Because you're about to visit a production site that could change the future of aviation, and because this is a business partnership, we have to put an end to the possibility of leaking secrets in advance. The metal expert is still expressionless, and the faction is more businesslike than the old captain in the spy war TV series.

Chang Yule didn't say a word, and directly signed his name on the confidentiality agreement.

This treatment not only did not give him the slightest plan, but made his heart full of indescribable surprises.

The backbone of the main body has been put to paper, and the remaining people naturally cannot be indifferent. It's just that they read the confidentiality agreement several times, and in the end, the two professors who have cooperated with Tianfu Aviation Industry Group on topics keep slandering in their hearts that this company has nothing to do.

Changing the future of aviation?

Even Tianfu Aviation Industry Group, which designed the J-20, the first stealth fighter in China, did not dare to say this. At most, they dare to say that they will strive to catch up with the footsteps of developed countries and strive to become a world-class aviation industry group in the next 10 years.

After twenty minutes of tossing, this legendary factory was finally opened to Chang Yule and his party. They rode in two special electric sightseeing vehicles and drilled into the factory like fish into a pond.

All the whispers and suspicions vanished after they entered.

It was as if they had walked into a giant factory, a six-seater sightseeing electric car, and in front of the production line of an elaborate flying machine, they couldn't even touch the edge of the pedestal. Two elaborate alloy aircraft frames are sitting at one end of the production line, and now it's just for visitors.

But this also makes everyone realize that when the production line is finally completed, the huge and strange flying machine above the head can be produced in the same way that the assembly line factory produces cans.

When the sightseeing car walked to hundreds of magic modified five-axis machining centers, the two aerospace professors could no longer show any other emotions except to breathe hard. The slander in their stomachs before entering the door has been completely shattered by everything in front of them.

It turned out to be a fully mechanized assembly solution?

Whether it is the production of small or large aircraft, as long as it involves manning, it is all assembled by hand.

The reason for manual assembly, in addition to the fact that it involves complex mechanical components and cannot be used to ensure the accuracy of automatic manipulators, is mainly related to the large number of lightweight composite materials used in modern aircraft.

Lightweight composite materials have the advantages of high strength and light weight, and whoever can apply more lightweight materials in aircraft with accurate weight reduction to the gram means a victory in economy. However, lightweight composites have many insurmountable problems, such as difficulty in welding.

Different metal materials have different melting points, and if two materials are welded together, its welding will become quite fragile. If it is used in an aircraft, the vibration generated by the flight alone can cause the aircraft to disintegrate in the air.

Even if this is recognized, lightweight composites are either made in one piece or riveted. However, because of the structural rupture of a certain part of the body, the volley disintegration incident that occurred, and when we look at the history of aviation casualties, we can still find a lot of blood and tragedies.

The process of assembling an aircraft has been so demanding that each assembly worker needs to use a special torque wrench with a counting function to collect the number of rotations of the upper screw.

The tightness of all screws is consistent, which allows the aircraft to avoid local structural abnormalities caused by resonance while flying.

The production line in front of me completely breaks this assembly scheme. Whether it's hundreds of five-axis machining centers or fully automated robots all over the production line, it shows that they don't need assemblers, they just have machines.

At the end of the production line, there are two gantry-like welding centers.

The height of the welding center is more than 20 meters, and judging from the diameter of the workbench and the sliding tracks scattered underneath, it is easy for the two professors to guess that these two gantry welding centers are the last process to complete the assembly of the aircraft.

This process is called riveting skin in traditional production.

The shell of the aircraft is connected by rivets, because the skin of the aircraft is a thin aluminum alloy, which cannot be welded at all. In addition, welding will also bring different structural strength, welding residual stress deformation and other defects.

When the aircraft is flying at high speed, the body vibrates very strongly, and with the welding skin, it is likely that a piece of skin with welding defects will be torn, and then like a torn piece of paper, the tear will expand rapidly.

"You're going to use welding to install the skin?" the two professors' eyebrows twitched, "Or is it an automatic welding process?"

"Is there a problem? Any aircraft has to undergo a structural static test, and if we dare to design it this way, we are sure to pass the test. Of course, Ye Qing understood what these two professors were thinking, they must have felt that the giant beast industry was crazy.

However, technology is used to break, and the existence of the rivet process does not prove that it is stronger than the welding process. However, due to the limitations of materials and body design technology, engineers can only use rivets.

There are more than 100,000 skin rivets on the fuselage of a passenger plane, and the rivets belong to the extra load, and the welding technology is adopted, which can naturally save a large amount of dead weight.

The two professors muttered several times, but finally could not find any reason to refute it.

Because they have never seen a delicate flying machine, and these devices in front of them are even more unheard of, they can't think about it, where do they have the courage to point fingers?

Chang Yule is also one of the insiders, and of course understands the importance of rivets to aircraft. It's just that he thinks that a flying machine from the 22nd century, such as a delicate flying machine, should be different. It's like a flying ship in a science fiction movie, if it is connected by dense rivets, doesn't it make people laugh off their big teeth?

As for the mechanics and pilots, they have been completely immersed in these huge industrial machines that make their blood boil.

……

By the time the electric sightseeing car drove out of the production center, the two professors had become intimidated, and they looked back at the production center with awe in their eyes.

At their next stop, they came to a seemingly ordinary factory.

The scale of this factory is not large, and the appearance is no different from that of an ordinary factory. But when the two automatic doors slid open, revealing the aircraft quietly parked inside, the crowd on the electric car couldn't even blink.

"This ...... This... What is this?"

"Difficult... Could it be that it was stuck on the production line before, that ...... The frame of the two aircraft... The two professors stammered for a long time.

"We plan to test its flying ability, do you want to ......" Ye Qing nodded with a smile, with a bad encouragement of "give it a try" in his eyes.

"Ah, we can also participate in flight tests?" said the two professors, who were pleasantly surprised by the great honor.

The compact aircraft has been painted in gold and red, with the glittering Behemoth Industries logo located on the tail doors and sides of the nose. It does not have the wheeled support structure of a traditional aircraft, with four retractable balanced hydraulic struts that replace the wheels.

Just when people were wondering if they should put the guide rails on this aircraft first, and then lift it out of the warehouse.

The dome of this warehouse suddenly made a mechanical movement sound of "click~click~", and the huge dome slowly slipped down to both sides under the drive of the slide rail.

The two professors "beeped~" and stepped on the automatic ladder to get into the aircraft.

Chang Yule had a tangled expression that wanted to go but didn't dare, so that Chang Wanyu's newborn calf was not afraid of tigers, if she hadn't been grabbed by her father, she would definitely be the third to get into the cabin.

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