As one of the leading aero engine experts in China, after this engine has solved the key material problem, Lin Yunwen has been worried about another problem, that is, the bearing problem. Pen × fun × Pavilion www. ｂｉｑｕｇｅ。 ｉｎｆｏ

For the time being, domestic bearings are used, and imported bearings are still being purchased, and the progress has been relatively slow. Lin Yun's expectation is that these domestic bearings should be able to survive a series of verification tests, including 300 hours of long-lasting tests.

Without thinking about it, Lin Yunwen was a little too optimistic, this aero engine that has undergone 300 hours of sustained testing, one of the main bearings has a big problem.

Under the magnifying glass, a very fine "pitting" appeared on the surface of one of the balls of the bearing, which was very, very small, and could only be seen clearly under the illumination of the light with the help of a magnifying glass.

That's the big thing!

Aviation bearings are absolutely different from general bearings, if it is a bearing of general mechanical equipment, there is such a small defect, there is no problem at all, you can continue to use, but aviation bearings are not!

For general structural components, even mild cracks can ensure safe use - this is professionally called damage tolerance, and there is no damage tolerance for key transmission components such as the main bearing of aero engines, and any form of damage is never allowed during use.

Seeing Wang Xudong asked with concern, Lin Yunwen said in a solemn tone: "Mr. Wang, we have encountered big trouble, the shortcomings in the barrel principle have appeared, these domestic bearings basically represent the highest level of domestic bearing manufacturing, but the service life of these bearings is only more than 300 hours. ”

The working environment of bearings in aero engines can be described as "purgatory", which not only has to run at a high speed of tens of thousands of revolutions per minute for a long time, but also bears various forms of stress extrusion, friction and ultra-high temperature.

Running under the conditions of high speed, high temperature and complex stress, the quality and performance of the main bearing directly affect the performance, life and reliability of the engine. One of the key indicators of aero engines is high reliability.

In order to ensure reliability, one of the prerequisites is to ensure that the bearings in the engine have a long life -- the life of the main bearing, the requirements of military aircraft aero engines are more than 3,000 hours, and the requirements of civil aircraft aero engines are even higher, reaching tens of thousands of hours.

Obviously, the life of these bearings is not enough, only 300 hours of service life, which will seriously limit the overall life of this engine.

If there is no good aero engine, it means that even if the engine is mass-produced, it will have to be overhauled every 300 hours with the aim of replacing the main bearing.

There was a big problem with the bearings, and the good news was that the turbine blades of the engine were intact, and it seemed that they would work for thousands of hours without any problems.

For aero engines, turbine blades are also one of the life parts, and if the life of the blades is not enough, it will also be a big problem.

This big problem did not appear, after 300 hours of long-term testing, after the test of high temperature, these turbine blades are intact, which is something that makes Lin Yunwen feel gratified, and the frowning brows finally stretched out a little.

Lin Yunwen said with emotion: "Everyone come to take a look, it is worthy of the super superalloy of Sanlian Special Steel Group, such a material is definitely the world's top." ”

For this engine, many high-temperature parts use super superalloys of Sanlian Special Steel Group, such as turbine discs, turbine blades, etc., and from the current point of view, this material performs very well.

A large number of super stainless steel of Sanlian Special Steel is used in the cold parts of the engine, such as compressor blades, casings, etc., through inspection, the performance of super stainless steel is also very good, even the color has not changed a little, brand new!

Overall, this engine performed very well, and the only deficiency was that its domestic bearings did not perform well.

Is there an imported bearing on this engine?

Wang Xudong picked up one of the imported bearings in his hand, which is a small bearing, not the main engine bearing.

It is estimated that the manufacturer of the bearing in China also knows that this is not the main bearing of the engine, so it is sold to Huaxia, an aero engine manufacturer.

As for the main bearing of the engine, it is generally not for sale. Even if you want to sell it, it must be limited and the price must be high. You don't have a top-level aviation bearing, and others sell it at a high price, so you can only pinch your nose and admit it.

Because of this, Lin Yunwen reluctantly used the domestic bearing, who knows, the domestic bearing is not powerful, can only carry 300 hours.

Imported aviation bearings, with toes can come up with, the use of must be the top bearing steel materials, Wang Xudong quietly started the "god-level big mine" system, with this imported bearing as a sample, began to "analyze" the bearing steel material of this bearing.

Soon, the "analysis" was completed, and Wang Xudong used the system to immediately generate detailed smelting technical materials for this bearing steel.

That is to say, as long as this smelting technical information is given to Chen Sanlian, Sanlian Special Steel can smelt this kind of bearing steel.

This is something produced by the system, and the samples used for analysis are imported aviation bearings, and the new type of bearing steel generated, without thinking, must be the world's top bearing steel, which is beyond doubt!

Succeed with flying colors!

Coming here to find Lin Yunwen, Wang Xudong is not to see what aero engine, the main purpose is to get an imported aviation bearing, analyze it well, and generate a full set of smelting technical data, and now, it has been successfully completed.

In the database of the system, there is a kind of world-class bearing steel smelting technical data. The new bearing steel material produced is certainly much better than the imported bearing material that is only used for analysis.

Wang Xudong took this small imported bearing and said with a smile: "Expert Lin, this is an imported bearing." ”

Lin Yunwen said: "Yes, it is imported and belongs to excellent aviation bearings, but unfortunately, it is not the main bearing of this engine." ”

Because of the technical blockade, foreign suppliers generally do not sell the main bearing, only sell this kind of small bearing, and the price is still expensive, but also limited.

Wang Xudong said: "Expert Lin, I want to tell you a good news, Sanlian Special Steel Group has developed the world's top bearing steel materials, ready to be smelted, and soon after, it will be able to sell a large number of the world's top bearing steel." ”

What the!

Lin Yunwen first looked at Wang Xudong blankly, and after a few seconds, he finally reacted, walked over, excited, held Wang Xudong's hand tightly, and asked in disbelief: "Mr. Wang, is this true?"

Everyone next to them, including those technicians, was also dumbfounded, feeling like they had been hit by a huge pie.

I am worried about the life of the bearing, and now it is good, Sanlian Special Steel Group has successfully developed the world's top bearing steel!

The world's top, this, everyone has never doubted, because the development of this bearing steel is Sanlian Special Steel Group, the previous development of super stainless steel, super high-strength steel, and the super superalloy used in this engine, which is not the world's top.

It is a triple special steel, and then developed a world-class bearing steel, no one will think that it is impossible, never doubt.

Seeing that everyone was looking at him, Wang Xudong nodded vigorously and said affirmatively: "Yes, it has indeed been successfully researched, the world's top bearing steel!"

With the world's top bearing steel, with China's industrial strength, can we not manufacture the world's top aviation bearings?

Not only the world's top aviation bearings, it is estimated that all kinds of world's top industrial bearings, because of the top bearing steel materials of Sanlian Special Steel, they will be sprung up like mushrooms, all of which are manufactured.

Holding Wang Xudong's hand tightly, Lin Yunwen was so happy that he didn't know what to say, he opened his mouth several times, but the words didn't come out of his mouth, he was too excited.

After a long time, he said, "Mr. Wang, you have done me a great favor again, no, you have done the entire aviation industry in China a great favor!"

A middle-aged man sweated profusely, walked over with an anxious face, and reported: "Mr. Lin, we have encountered a big problem in the procurement of imported bearings, and the overseas supplier who originally promised to sell us bearings suddenly changed his tune. ”

The domestic main bearing is not powerful, and the imported bearings from overseas cannot be bought, if he heard this problem a few minutes ago, Lin Yunwen is estimated to be in a hurry. Now, not really.

Lin Yunwen smiled happily and asked: "Mr. Wang, when will Sanlian Special Steel Group be able to smelt the first batch of bearing steel?" ”

Wang Xudong said affirmatively: "It won't be more than three months." ”

There is a ready-made full set of smelting technical information, coupled with the current strength of Sanlian Special Steel, three months is enough.

Listening to Wang Xudong's answer, Lin Yunwen took a reassuring pill, smiled even happier, and said magnificently: "They don't sell it, we don't want it yet, tell them that we won't buy it!"

What, don't buy it!

So what about this engine, it is the engine of a new fighter that the military urgently needs, and it is waiting for it to be installed in batches, there are no imported bearings, how can it be mass-produced, even if it is mass-produced, it is estimated that the service life of the engine will not go up.

As soon as he heard that the other party was not selling, he immediately came over anxiously, and he didn't know that Sanlian Special Steel had successfully developed the world's top bearing steel materials, and looked at Lin Yunwen with a puzzled face, and saw that everyone next to him had a relaxed face, and some people even looked happy, he was even more puzzled.

What's going on!

Someone reminded him, patted him lightly on the shoulder, and said with a smile: "Old Tan, just do what Mr. Lin said, we won't buy it, because we will have the world's top bearing steel materials, and we can produce the world's top aviation bearings by ourselves." ”

What the!

We have our own world-class bearing steel materials, no?

"Lao Tan is true, Sanlian Special Steel has successfully developed the world's top bearing steel materials, our aviation bearings, no longer need to be imported, they don't want to get stuck in our necks again, they don't sell, we don't buy. ”

I see.

He turned around and walked excitedly, and wanted to tell the overseas supplier that we don't want your bearings!

………

The third is sent!

That's all for today's update, thank you!!