Chapter 612

If it is said that the "special air vehicle" surprised Wang Huan and others because of its strange shape and the move of the plane loading, then what Qiao Shiming said just now really shocked these people.

No way, it's really because compared with the sensory stimulation of the "special air vehicle", the repair of the low-pressure turbine blade of jt9d turbofan engine really touches the soul of Shanghai Airlines.

You should know that the repair of aero-engine turbine blades is a very high-end category, not to mention at home, even abroad. It can not be done by any enterprise or factory.

After all, turbine blade is one of the most critical heating parts of aero-engine, which needs to bear the high temperature of thousands of degrees Celsius and unimaginable high-speed centrifugal force. Therefore, turbine blade is the top in the industrial category in terms of material, technology and processing.

Especially for high thrust turbofan engines such as jt9d turbofan engine, the production process of turbine blades is quite complicated. Apart from other things, the film cooling holes and internal cavities used for heat dissipation are extremely exquisite works of art. However, it is said that more is superfluous and less performance is not enough, reaching an unprecedented extreme.

It's such a kind of human industrial crystal that can be compared to art works. It's really hard to repair it. It's not an ordinary difficulty to build a dojo in a screw case.

Because of this, only the United States and several European enterprises controlled by the United States can do this kind of turbine blade repair in the world. Independent countries like France can do it, but the overall quality is not as good as that of the United States. Countries like Japan have no corresponding ability, so they dare not touch it and can only hand it over to the United States.

As a result, Qiao Shiming said that the low pressure turbine blades of jt9d turbofan engine delivered three days ago had been repaired?

Although the main cause of jt9d turbofan engine failure this time is not the big problem of turbine blade damage or fracture, it is just that the clearance between the shroud of the front section of the low pressure turbine blade and the sealing ring of the outer honeycomb assembly increases due to long-term use, which triggers the aeroengine alarm.

Strictly speaking, the maintenance of LP turbine blade is not as difficult as that of LP turbine blade itself, but compared with the complexity of LP turbine blade itself, the overall difficulty is still higher than that of other parts.

The first is the material, because it needs to bear certain high temperature and high pressure, so the shroud of low pressure turbine blade is made of high temperature resistant nickel base alloy.

The second is heat treatment. Because of the unique properties of high temperature resistant nickel base alloy, the heat treatment needs to be very meticulous. There are extremely strict requirements for quenching, tempering and cooling medium. The temperature is controlled within 1 ℃, otherwise the whole part may be scrapped due to internal metallographic structure change.

The third is machining. Needless to say, aviation machining only has precision, precision and more precision. Either it has high precision machine tools, or it has to have highly skilled level 8 workers, otherwise it is difficult to achieve the ultimate precision.

Finally, it is combined with the blade, so the precision welding process can not escape. Although there are many subdivision methods, no matter what method it is, each one is at the forefront of the welding field.

To sum up, it's just a general direction. There are many details in it. Each one is high-end in high-end. Otherwise, aero engine would not be called the Pearl in the industrial crown and go to the extreme.

However, is this kind of acme, has Tengfei aviation maintenance factory become?

In three days, it's only three days and 72 hours since the jt9d turbofan engine arrived at the factory, and the low pressure turbine blade's strain crown has been repaired?

Let alone Wang Huan, who is an expert, is Qi Hong. They all think that their ears are wrong. We should know that the Boeing 767 failure of their airline is sudden. It is impossible for Tengfei aviation repair factory to know in advance, let alone prepare materials and plans in advance. It is totally temporary. How can Tengfei aviation repair factory be so quick without preparation Can it be fixed?

If nothing else, how can we solve the problem?

Generally speaking, it takes more than three days from synthetic materials to integral casting, let alone the subsequent heat treatment and machining.

You should know that in the past, when outsourcing maintenance companies in the United States or Europe helped Shanghai Airlines to do similar low-pressure turbine blade strain crown maintenance, the minimum cycle was about one and a half months. As a result, Tengfei aviation maintenance plant only took three days. How could it be possible!

Seeing that Wang Huan and others didn't believe it, Qiao Shiming didn't explain it too much. Instead, he pointed to the small factory on the other side: "go there first."

Then he lifted his legs and left.

Wang Huan and others were stunned. They said that if you could answer the question first, it would make people crazy.

Fortunately, Zheng Yongning began to explain at this time: "Wang Gong, manager Qi, you'd better go and have a look. It's a new technology just applied in our factory. It's the new technology that can repair the strain crown of the low pressure turbine blade of jt9d turbofan engine in three days."

In this way, Wang Huan and others understand what's going on. Even if they are interested, what kind of technology can they do well in high-end repair work in three days?With three points of suspicion, three points of curiosity, three points of expectation and one point of caution, Wang Huan and others followed Qiao Shiming, and soon came to the very humble small factory building. As soon as they entered, they felt strange, because the whole interior was not so much a factory building as a laboratory, all kinds of instruments, all kinds of display devices, as well as brilliant calculation and processing Together with the staff in white coats who shuttled back and forth, Wang Huan and others thought they were in the wrong place.

As soon as he was ready to ask Zheng Yongning, who was next to him, if it was a production workshop, Qiao Shiming suddenly said, "well, it's just the right time for them to start processing the new low pressure turbine blade crown."

As soon as they pointed to the center of the factory building, they immediately took advantage of the situation and saw that in the center of the factory building separated by the rear glass stood large equipment more than two meters high and three meters wide.

However, although the equipment is large, most of them are supporting mechanisms or auxiliary structures. The real core is the translucent workbench in the middle, which is no more than the size of an 18 inch TV set.

Inside, something similar to the processing probe is moving back and forth flexibly.

"This is Multi axis machining center

Because of the distance, the small worktable on the equipment, and the poor eyesight, Wang huangen could not see what was going on inside, but from the overall structure, it was in line with Wang Huan's setting of multi axis machining center.

Zheng Yongning laughed: "this is more magical than multi axis machining center. Wang Gong, look here. There is real-time monitoring on the screen."

Being reminded, Wang Huan noticed that the screen on the console next to him was just the picture in the equipment workbench. He quickly held his glasses and looked at it.

On the black-and-white screen, the flexible probe rotates along a strange track for a circle, then a device blocks it, and then the probe continues to draw a strange circle.

After only two eyes, Wang huanbian frowned. What is it? It's not a multi axis machining center. What is it? Boring circle machine? Should Tengfei aviation maintenance factory be so boring.

Just as Wang Huan was about to say a few words, Qi Hong suddenly touched him with his hand. Then he pointed to the screen and said, "Wang Gong, look, the metal parts are growing up one layer at a time."

Wang Huan smell speech again look carefully, the face is also like Qihong as hell, the metal parts in the workbench really in their own growth.