The Military-industrial Scientific Research System of the Academic Master Chapter 905

Chapter 905 Special-shaped air film hole, punched successfully!

Preparatory work before the start of trial production lasted for nearly a week.

In fact, although the entire testing workload is heavy, it is basically repetitive work, so the process itself is not complicated.

It was all arranged the next day.

But anyone who has ever entered a factory (regular factory) knows that safety training takes up the longest time before starting work.

Ordinarily, those chosen to come to the capital are all master craftsmen, but the situation of laser processing is different from mechanical processing after all, and the equipment itself is not very stable.

So Chang Haonan and Academician Hou even spent two days demonstrating some precautions in the operation of this equipment.

Finally, everyone was given two days off.

After recuperating, trial production officially begins!

According to usual practice, this first process test naturally requires a very high specification configuration...

As the head of the production process group of the Turbofan 10 team, Zhong Shihong fixed the first turbine blade that had been coated on a special fixture.

Immediately afterwards, Chang Haonan, who was sitting in front of the computer, copied the process parameter setting code that he had written before into the command line interface—

Because time was so tight, there was no time to design the UI interface of the control system. It could only be set by connecting an external laptop and inputting operation commands on site.

Han Zhigao, who leads the light source control team, fuses the power of the laser and opens the valve of the solution circulation module.

Huo Penghua, the leader of the signal transmission team, conducted routine safety inspections before processing.

The testing workshop in the laboratory is naturally not large.

The entire team consists of nearly 30 people, and several of them have to run forward and backward, so it is indeed a bit crowded.

However, under the command of Chang Haonan, the entire boot process was carried out in an orderly manner to the end.

Academician Hou Xun, the general person in charge of hardware research and development, personally pressed the yellow button to start processing...

With a slightly harsh buzzing sound, the micro vacuum pump started working, pumping the special neutral salt solution stored in a tank not far away into the workbench.

The surface of the workpiece is slowly immersed in the liquid.

At the same time, several consecutive sets of booster coils increase the current in the high-power system to the operating level of the laser.

In order to prevent some relatively fragile electronic components from thermal breakdown, a cooling system that has nothing to do with the processing itself but is bulky and essential has also been started.

“If there are superconducting materials with relatively high availability, the working efficiency of the entire laser can continue to improve.”

Academician Hou leaned on a table, looked at the equipment that was still under the yellow light (waiting for processing), and slowly said to Chang Haonan next to him:

"Although some optoelectronic technologies are used at the control signal level, the energy system still uses electricity. Now the thermal effect is more obvious. In addition to the time-consuming preparation phase before processing, the allowable continuous working time of the entire laser also has to be used. The lifespan is not very satisfactory either.”

Hou Xun is already quite old and may be forced to withdraw from the front line of scientific research at any time due to physical reasons.

Therefore, he is even more eager to seize this last opportunity and personally implement the technology he has studied for many years.

Moreover, to achieve perfection

“I have considered this before.”

Chang Haonan replied somewhat helplessly:

“However, current research generally believes that the road to copper-oxide superconductors has been exhausted. The upper limit is basically around 130K, and it can only be realized at an extremely high pressure. There is almost no possibility of being put into application..."

Since we have decided to go in the direction of computational materials science, high-temperature superconductivity and even room-temperature superconductivity will definitely be a technical difficulty that must be overcome sooner or later.

However, before his rebirth, Chang Haonan did not know much about the field of superconductivity, so he was unable to gain the foresight that he had in the aviation field.

The situation can only be understood by relying on some papers of this era.

He may have heard of some concepts of iron-based or nickel-based superconductivity, but after checking a series of information, he found that in 2001, the academic community still seemed to believe that iron was not conducive to the formation of superconductivity.

Obviously, there should have been an evolution at a theoretical level.

So the workload involved probably won't be too small.

Chang Haonan currently does not have much time to systematically engage in research in this area.

If you just make a few scattered superconducting materials based on the fragments of words you heard in the previous life...

It may not be difficult to write about Nature or Science.

However, this is not what Chang Haonan really wants.

He is not short of those papers.

On the contrary, it is possible for competitors to notice this direction in advance.

Hence, superconductivity is an “important but not urgent” issue in Chang Haonan's timetable, and is ranked relatively low.

Looking at Academician Hou who looked melancholy, he wanted to say a few words of comfort, but for a moment he didn't know how to speak.

You can't tell people that if you insist on living a few more years, you might be able to see that day...

Fortunately at this time, the long spell casting movement is finally over.

A weak, but clear and crisp sound of "pap-pap-pap-pap-pap" interrupted the somewhat depressing silence.

This is the sound made by the ultrshort laser when it is working.

At this time, the laser processing light source has also been immersed in the salt solution together with the workpiece.

Invisible to everyone, the laser beam passes through a series of components such as the pump cavity, aperture, output mirror and beam expander, continuously intensifies and narrows, and finally emerges from the partial reflector and hits the turbine blade to be processed. On the surface. After 10 femtoseconds, due to the intense inverse bremsstrahlung radiation, the electrons around the metal atoms began to absorb the laser energy, and the average kinetic energy increased rapidly.

In the following 90 femtoseconds, the increasingly violent collisions between electrons began to affect the vibration energy of the metal atoms themselves, and the molecular groups that were originally firmly "bound" together by the binding energy began to become active.

Finally, within a time scale of less than 1 picosecond, the energy possessed by the particles breaks through the binding energy that binds them together. Like a city wall hit by a trebuchet, in microscopic "explosions" one after another, Falling off the surface of the material…

Human beings cannot accurately observe this process through any sophisticated equipment, but it does exist.

And, according to the settings of this experiment, it will happen 500,000 times every second.

Time passes by minute by minute.

For the people sitting (standing) around the equipment, they can only see the dazzling green light still shining through the dark glass, and the monotonous but rhythmic snapping sound to judge that the equipment is still in working condition.

All we can do is wait.

Finally, after two hours that lasted as long as two centuries, the instrument's working status indicator light changed from red to yellow again.

This means that the machining process has been completed.

As long as the working fluid is discharged and the equipment is cooled, this round of processing will be officially completed.

It was still Zhong Shihong, who opened the cover covered with dark glass and carefully took the blade out from inside with both hands.

It is no exaggeration to say that the first time he held his own child, he had never used such gentle movements.

“Mr. Chang, look.”

Zhong Shihong's voice was trembling.

From the appearance, you can already see rows of neatly distributed basket-shaped air film holes on the surface of the blade.

This rather complex hole shape is one of the key factors that enable the turbofan 10 to achieve "three and a half generations" performance using relatively backward materials.

But at the same time, it is also the “culprit” that has caused the delay in completing the ramp-up of its production capacity.

Of course, the processing effect is impossible to see with the naked eye.

So after appreciating his masterpiece for a while, Chang Haonan calmed down and then ordered:

“Hurry, put the samples in bags and seal them, and send them to the next door for inspection!”

"yes!"

Zhong Shihong stood upright, found a sealed bag as quickly as possible, and quickly left the test workshop with another technician.

Four years ago, when Chang Haonan improved the drilling process for the Turbojet 14, this type of inspection even required a special flight to Lianhai to do it.

Now, there is a fully functional testing center in the main building of the Torch Laboratory less than 100 meters away.

It can be said to be a shotgun exchange for a cannon.

The results of spending a lot of money are also shown at this critical moment.

Even before it was time for lunch, the two people ran back happily.

In addition to the samples I brought back, I also have a test report.

“Report to Mr. Chang!”

Zhong Shihong came to Chang Haonan. Perhaps he was breathing unevenly due to running. After taking several deep breaths, he opened the report in his hand:

“According to the inspection of a total of 45 air film holes on the surface of the workpiece, the hole diameter, positioning accuracy, and hot-melt layer thickness of all air film holes meet the production requirements. The roughness and curvature of the inner surface of the holes slightly exceed the requirements. , but still better than the optimal result after EDM..."

After listening to this report, Chang Haonan finally felt relieved:

“Comrades.”

His tone was obviously filled with suppressed excitement:

“I declare that the first round and first production test of the ultrshort pulse laser processor was a complete success!”

The moment Chang Haonan finished speaking, cheers resounded throughout the workshop.

Especially on Academician Hou's team, many people even had tears in their eyes.

If it weren't for the tight string of safety regulations, I'm afraid someone would jump three feet high—

It is normal for the first trial production to not be able to obtain a product that fully meets the requirements.

On the one hand, the processing speed, including the processing effect, must still have an optimization range. Otherwise, there would be no need to bother with trial production and it would just be commercialized directly.

On the other hand, as long as there are no problems with parameters such as positioning accuracy and hole diameter that are not easy to modify, the remaining parts, even if some are beyond the allowable range, can still be recovered through the subsequent finishing process.

Achieving this result has exceeded the psychological expectations of everyone present.

Next, as long as the test proceeds step by step, it is only a matter of time before a relatively optimal set of process parameters is obtained.

in other words.

The mass production of Turbofan 10 is coming soon!

(End of this chapter)

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