After hanging up the phone, Chen Nian looked at the engine data sheet that had taken shape in front of him, feeling secretly proud.
The so-called data problem that Lei Gang mentioned is actually a problem of matching and connecting the various parts of the engine. In the final analysis, it is a problem of tolerance.
Why is it difficult to reverse engineer an aircraft engine?
Why do you say that even if you were given a flight deck to disassemble in front of your eyes, you still wouldn't be able to build it?
In fact, to put it bluntly, in addition to hard indicators such as materials, the word "tolerance" can fully explain it.
A very simple example, suppose the size of a part is 10 nanometers, but you don’t know its tolerance, then when manufacturing it, should you make it according to 10 nanometers or 9 nanometers?
If it is 10 nanometers, it is best to be able to restore it 100%, but the problem is that there will be tolerances when you manufacture it, causing the part to become 11 nanometers, breaking the tolerance range, and then the part will be useless.
As for some people who say, then I can just do it at 10 nanometers and strictly copy it, right?
Nonsense.
If your machines and processes can guarantee that you will make 10 nanometers if you say you want to make 10 nanometers, then you still have to engage in reverse engineering.
Regarding this technology alone, not to mention what you can build, just by getting some technology patents, you can get back the aviation engine design drawings.
Therefore, standard dimensions and tolerances are indispensable. This is exactly what Lei Gang said.
Standard dimensions and tolerances are a golden finger that can bring both data to a relatively reasonable range at one time, which can save the project team a lot of trial and error costs.
Perhaps steps that previously required hundreds or thousands of experiments will only require dozens, or even less than ten, by then.
In this way, the efficiency improvement is self-evident.
And now, Chen Nian has mastered such a "golden finger".
He thought for a moment, added a few more data on the paper, and then put down the pen.
At this time, on this piece of paper, all the data on the core components of the engine are complete, including the combustion chamber, flame tube, press and other key parts. The processes required for processing are even marked.
Of course, since there is no specific analysis, these processes are just names and have no guiding significance.
But even if it's just that, this drawing can be said to be priceless.
If any country in the world, including the United States, which built the F119 engine, knew that this blueprint existed, they would do anything to snatch it.
Because they will not allow their key technology to wander outside, let alone allow people who have mastered this technology to live in this world.
After thinking for a moment, Chen Nian burned the drawings, then split the components into parts and began to copy the data one by one.
He planned to hand over each data to Lei Gang in batches after the copying was completed.
In this way, even if a leak occurs during the process, the data of a single part will not be enough to attract the attention of the opponent.
Although the workload will inevitably increase, it is absolutely necessary...
.......
After a whole night, Chen Nian finally completed transcribing all the key data. He put the thick notebook in his bag and carried it with him. Then he went to the "classroom" next to his residence according to the course schedule, preparing to start today's small class. class.
The teacher in class is named Hu Xu, who is an expert in aerospace materials science at a certain research institute. He mainly teaches Chen Nian about materials science.
Since Chen Nian had a certain foundation before, he did not start from the most basic content. Instead, he tried his best to ensure that the course was consistent with the general direction of Chen Nian's aircraft design. Most of the time was spent on titanium alloy casting. The core of the content is internal crystal defect processing.
"...There are a large number of pores between loose powder particles. At the same time, due to the irregular shape and uneven surface of the powder particles, they mostly contact each other in point-like manner, so the number of other particles in direct contact with one particle is very small. .
When an external force is applied to the powder, under the action of compressive stress, the following situations may occur in the powder body: randomly stacked powders will translate or rotate closer to each other; some powders will be squeezed into adjacent gaps... ."
"This stage is called example proximity and rearrangement. After that, it will enter the plastic deformation and diffusion creep stages."
"Of course, these three stages are not completely separate, but work simultaneously to promote the densification of the powder."
"So Xiaonian, can you now understand why hot isostatic pressing can solve the casting problems of most titanium alloy materials?"
At this point, Hu Xu paused for a moment. He looked at Chen Nian sitting opposite, waiting for Chen Nian's answer.
In fact, he was extremely reluctant when he was asked to teach a freshman.
After all, where is my academic status? Those who usually take classes from me must be at least a doctoral student or above.
For such students, no matter what content is taught, they can understand everything and learn it immediately. All they have to do is to constantly provide them with new directions and provide some inspiration at critical moments.
And what about Chen Nian?
An amateur player with a weak foundation, it took him two full days to understand what he considered to be the simplest crystal growth model.
What’s the point of teaching such students?
He really wanted to give up, but he couldn't refuse due to the instructions from his superiors.
So his first two classes were actually very perfunctory.
----Until one day, his superiors suddenly found him and informed him that he had entered the confidentiality sequence of Project 22, and revealed Chen Nian's identity and contribution during this period to him.
Completed the key design of an important aircraft, proposed two industrial manufacturing processes for new materials, and through verification, pointed out major technical flaws in a key project, saved a huge amount of national property, promoted the establishment of a project, and took the initiative to undertake key tasks ...
Is this something that a student can do?
I have been doing research for decades, but what I am pursuing is just one of them!
And it only took him a few months to complete the Grand Slam...
Then, everything changed.
In his eyes, Chen Nian is no longer Chen Nian, but Xiao Nian.
A freshman is no longer a freshman, but a rising star…
"Because of the synchronous and uniform heating, the internal molecular structure movement is affected by static pressure and can be transmitted evenly in all directions. This reduces the compressive stress on the particle contact surface and reduces the shear stress. Even brittle materials can be processed plastically stably. .”
"That's right! You learn quickly!"
Hu Xu nodded happily, affirmed Chen Nian's answer, and then continued:
"Not only that, the hot isostatic pressing method can effectively eliminate the participating voids in the product and reduce the void volume, which greatly improves the performance and life of the product..."
The two of them asked and answered each other. Chen Nian asked a targeted question from time to time, and Hu Xu patiently answered it.
More than three hours later, all the scheduled courses had been completed, and both of them were still a little unfinished.
Looking at Chen Nian who was taking notes seriously, Hu Xu said sincerely:
"Xiao Nian, your talent in materials science is not the highest I have ever seen, but your character is definitely the best."
"Not only his character, but his overall vision is also very good."
"You are not like most beginners who learn whatever they want. When you learn one subject, it will naturally connect to other subjects."
"This kind of vision is rare. If you can stick to it, your achievements will definitely be more than this..."
Chen Nian chuckled and replied:
"I just want to learn more, I will definitely use it in the future."
"By the way, Professor Hu, I still have your class the day after tomorrow. I see that the class schedule is to continue teaching titanium alloys, but I have some new ideas recently and want to learn about ceramics first. Can you make arrangements?"
"Yes, why not! I will adjust the class schedule, and it will definitely not affect our overall thinking."
Hu Xu agreed immediately, and Chen Nian nodded gratefully.
After another lesson of study, the number of source points he accumulated successfully reached 0.26 points.
So, he plans to start "spending money".
The object is the key ceramic-based TBC material in engine technology...
