Chapter 905: Special-shaped air film hole, drilling successful!

The preparations before trial production began lasted nearly a week.

In fact, although the entire test is very labor-intensive, it is basically repetitive work, so the process itself is not complicated.

The arrangements were completed for the next day.

But anyone who has worked in a factory (a formal factory) knows that safety training takes up the longest time before starting work.

In theory, those who were selected to come to Beijing are all experienced workers, but laser processing is different from mechanical processing after all, and the equipment itself is not very stable.

Therefore, 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 resting up, trial production officially begins!

According to convention, this first process test naturally has to adopt a very high specification configuration...

As the head of the production process group of the WS-10 team, Zhong Shihong fixed the first coated turbine blade on a special fixture.

Then, sitting in front of the computer, Chang Haonan copied the process parameter setting code that he had written earlier into the command line interface.

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

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

Huo Penghua, head of the signal transmission team, conducted a routine safety check before processing.

……

The testing workshop in the laboratory is naturally not very large.

The whole team has nearly thirty people, and several of them have to run around, so it is indeed a bit crowded.

However, under Chang Haonan's command, the entire startup process was carried out in an orderly manner until the end.

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

"Om-"

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 workpiece surface is slowly immersed in the liquid.

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

In order to prevent some fragile electronic components from being broken down by heat, a cooling system that is unrelated to the processing itself but is large and indispensable has already been activated.

"If there is a relatively strong availability of superconducting materials, the efficiency of the entire laser can be further improved."

Academician Hou leaned on a table, looking at the equipment that was still in the yellow light (waiting for processing) state, and slowly spoke to Chang Haonan beside him:

“Although some optoelectronic technologies are used at the control signal level, the energy system still needs electricity after all. The thermal effect is now quite obvious. As a result, in addition to the time-consuming preparation stage before processing, the allowable continuous working time and service life of the entire laser are not very satisfactory.”

Hou Xun is already quite old and may be forced to withdraw from scientific research at any time due to health reasons.

Therefore, he was even more eager to seize this last opportunity to personally implement the technology he had researched for many years.

Moreover, to achieve perfection

“I’ve thought about this before.”

Chang Haonan replied helplessly:

"However, current research generally believes that the road to copper oxide superconductors has been reached, and the upper limit is basically around 130K, and it can only be achieved under extremely high pressure, making it almost impossible to put it into practical use..."

Since we have decided to pursue the direction of computational materials science, high-temperature superconductivity and even room-temperature superconductivity will surely be technical challenges that we will have to overcome sooner or later.

However, before his rebirth, Chang Haonan knew very little about the field of superconductivity, so he could not gain the same foresight as in the field of aviation.

We can only understand the situation by relying on some papers of this era.

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

Obviously, there must have been an evolution at the theoretical level.

So the workload involved is probably not too small.

However, Chang Haonan currently cannot spare much time to engage in systematic research in this area.

If I just follow the few words I heard in my previous life and create a few scattered superconducting materials...

Publishing in Nature or Science may not be difficult.

However, this is not what Chang Haonan really wants.

He doesn't lack those papers.

On the contrary, it may allow competitors to notice this direction in advance.

Therefore, superconductivity is classified as "important but not urgent" on Chang Haonan's schedule and is ranked relatively low.

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

You can't tell people that if you just live a few more years, you might see that day...

Fortunately, at this time, the long pre-casting period finally ended.

A faint but crisp "pa pa pa" sound interrupted the somewhat depressing silence at the scene.

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

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

In a place that no one can see, the laser beam passes through a series of components such as the pump cavity, aperture, output mirror and beam expander, and is continuously strengthened and narrowed. It is finally emitted from the partial reflection mirror and hits the surface of the turbine blade to be processed.

After 10 femtoseconds, due to violent inverse bremsstrahlung radiation, the electrons around the metal atoms begin to absorb laser energy and the average kinetic energy increases rapidly.

In the following 90 femtoseconds, 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 binding energy began to become active.

Finally, within a time scale of less than 1 picosecond, the energy of the particles broke through the binding energy that bound them together, and like a wall hit by a catapult, they fell off the surface of the material in a series of microscopic "explosions"...

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

And, according to the settings of this experiment, this will happen 50 times per second.

……

Time passed by minute by minute.

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

All we can do is wait.

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

This means the machining process is complete.

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

It was still Zhong Shihong who pulled open the cover covered with dark glass and carefully took the leaf out with both hands.

It is no exaggeration to say that he did not use such gentle movements when he held his own child for the first time.

"Mr. Chang, look."

There was a tremor in Zhong Shihong's voice.

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

This rather complex hole shape is one of the key factors that enables the WS-10 to achieve "third and a half generation" performance using relatively backward materials.

But at the same time, it is also the "culprit" that has caused its production capacity to be slow to ramp up.

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

Therefore, after admiring his masterpiece for a while, Chang Haonan calmed down and gave the order:

"Quick, pack the samples into bags and seal them, and send them to the next door for inspection!"

"Yes!"

Zhong Shihong stood at attention, then found a sealing bag as quickly as possible, and then quickly left the test workshop with another technician.

Four years ago, when Chang Haonan was improving the drilling process for the WP-14, this type of inspection even required a special flight to Lianhai.

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

It can be said that it is a complete upgrade.

The results of spending huge amounts of money were also shown at this critical moment.

Before it was even time for lunch, the two of them came running back excitedly.

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

"Report to President Chang!"

Zhong Shihong came to Chang Haonan. Perhaps due to running, he was out of breath. He took several deep breaths before opening the report in his hand:

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

"..."

"call--"

After hearing this report, Chang Haonan finally put his mind at ease:

"Comrades."

His tone was obviously filled with suppressed excitement:

"I declare that the first round of production testing of the ultrashort pulse laser processor was a complete success!"

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

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

If it weren't for the string of safety regulations, I'm afraid some people would jump three feet high -

It is normal to not get a product that fully meets the requirements during the first trial production.

On the one hand, there must be an optimization range for processing speed, including processing results. Otherwise, there would be no need to bother with trial production and commercialization could be pursued directly.

On the other hand, as long as the parameters that are not easy to modify, such as positioning accuracy and aperture, are correct, the remaining parts, even if they are somewhat beyond the allowable range, can still be recovered through subsequent finishing processes.

Being able to achieve this result has already exceeded the psychological expectations of everyone present.

Next, as long as the tests proceed step by step, it is only a matter of time to obtain a relatively optimal set of process parameters.

in other words.

The mass production of WS-10 is coming soon!