From Almighty Scholar to Chief Scientist

Chapter 224 Breaking the monopoly!

"It is the encoder that determines the accuracy of the servo motor."

"There are three main types of encoders, optical encoders, magnetic encoders, and capacitive encoders. Among them, optical encoders are the most widely used, and they are more trustworthy in terms of accuracy."

After collecting all the knowledge about encoders, Lin Xiao chose his purpose.

The encoder can give feedback to the movement of the servo motor, and then use these feedbacks to further control the accuracy of the servo motor, so if you want to break through the servo motor, you need to optimize the encoder.

What determines whether the encoder is good or bad is firstly related to the internal elastic material of the encoder, but Huaguo obviously still has certain weaknesses in the material, and the second is the internal structure of the encoder and the control of the computer algorithm.

Excellent structure, even if the material is not good, can be completely optimized.

Of course, for Lin Xiao, the material of the encoder is not a problem, because all the structures of the lithography machine in his mind and the servo motor inside are clear to him.

So it’s no problem to copy it directly, but it’s still the same sentence, copying is not his character, he not only wants to build a lithography machine, but also a better lithography machine than foreign countries, and better servo motors, It is better precision, which will be very beneficial to the future production speed of lithography machines.

At that time, their lithography machines will be better than Asmer's, and they will not sell them abroad. Huaguo will set up their own chip foundry, just like TSMC.

Of course, the ideal is very lofty, and you need to start doing it yourself.

"Then get Asmail's encoder up first."

Thinking of this, Lin Xiao directly opened the mechanical design software and started his own modeling.

Because he had references in his mind, his modeling speed was also very fast. It didn't take long for an encoder to appear in front of his screen.

"This is an incremental encoder. It achieves 1 pulses per millimeter. It is worthy of foreign devils. It is indeed amazing."

Seeing this, Lin Xiao felt a little emotional in his heart. Twenty-five thousand pulses per millimeter means that the distance change brought by the encoder with one pulse is one twenty-five-thousandth of a millimeter, which is about 40 nanometers. The resolution is equivalent to a quarter of it, that is, 10 nanometers, and then combining multiple encoders can make this resolution drop again to a lower level.

This has to make people sigh with emotion, even for Lin Xiao.

Of course, he was emotional, and he didn't forget his purpose.

"Well... with this structure... there is still a lot of room for optimization."

Lin Xiao thought about it seriously.

For mechanical optimization, the most important test is the ability in physics, followed by the ability in materials science, and it just so happens that his level in these two subjects is relatively high.

So after a short glance, he had roughly several directions in his mind.

Then he began to modify the model on the [-]D software in front of him.

For example, dichotomy.

The dichotomy in mathematics can continuously obtain an approximate value, and there is also a dichotomy in physics, and there is also such a method in the application of structure.

By changing the internal structure of the encoder, if its own resolution is 10 nanometers, but if its internal structure is changed so that the distance change brought by it each time is divided into half, then its resolution It can come to 5 nanometers.

And this is just Lin Xiao's temporary idea. How to optimize its structure still needs some research.

This is also what he has to study, because Huaguo can't make this kind of sensor that can achieve [-] pulses per millimeter. Even if he has the structure and materials of those foreign precision sensors in his mind, but if he wants to make it, he needs another sensor. A field of technology too.

Huaguo's backwardness in sensors also restricts Huaguo's development in many industries. Obviously, it is impossible for Lin Xiao to go from lithography machines, to servo motors, to encoders, and finally to sensors.

So Lin Xiao could only find another way.

It's like a story: in order to detect whether there is soap in the soap box produced in the assembly line, foreign soap factories invited automation experts to design, all the machinery, microelectronics, and X-ray detection technologies. After using it, the problem was successfully solved in the end, and the total cost was tens of millions of dollars.

But this problem was also faced in a soap factory in Huaguo, but obviously the owner of the factory didn’t have that much money and went to hire experts and do X-rays or something, so the engineers here thought about it, and finally came up with I found a way to put a large electric fan next to the production line, and the empty soap box will be blown away by it. If it is not empty, it will not be blown away, so the problem has been solved, and the total cost is tens of yuan. .

This story is also Lin Xiao's way of thinking about solving problems.

Use the existing things in Huaguo to achieve the extent that you don't have.

This is also a direction that many Chinese scientists are committed to research. Sometimes, if you are not careful, you can reach a level that even foreign countries envy, such as the overall structure of an aircraft. Foreign materials are good, so the material strength can directly improve the fuselage structure. The strength of Huaguo's materials is not good enough, scientists have come up with a 3D printing aircraft structure technology, although our materials are not good, but because the 3D printed structure is completely integrated, there is no need to use welding or rivets, so The strength of the overall structure should be better.

Another example is that the noise of Huaguo nuclear submarines has been ridiculed by foreign countries in the past. As a result, Huaguo scientists came up with a shaftless pump technology, which made Huaguo nuclear submarines truly "quiet" from then on.

Therefore, what Lin Xiao is walking now is exactly the same path that these Huaguo seniors have walked.

And he also knew in his heart that once his idea was successful, the pattern of coders in the world would change.

Because of the dichotomy method, it is obviously not only divided once, it can also be divided into four, eight, or even sixteen.

At that time, even if the Huaguo encoder can only achieve 1000 pulses per millimeter, it is equivalent to a resolution of only 250 nanometers, but after its structural optimization, it can also be reduced to about 10 nanometers, and then by The combination of multiple encoders can also be accurate to a lower degree.

In this way, after analyzing the structure in front of him, Lin Xiao also took a draft paper in his hand, and drew a blueprint on it.

From time to time, he stopped writing to think, and just like that, more ideas emerged in his mind.

"It seems... that's okay?"

A flash of light suddenly flashed in Lin Xiao's mind, and Lin Xiao's eyes lit up, and the lines on the draft paper became more and more complicated.

……

Time passes quickly.

About a month passed.

This month, this month, Lin Xiao has been researching the encoder.

Of course, the harvest is still great. At least, he has established a new encoder on the software, and achieved eight times its displacement distance, which means that its accuracy has increased by eight times.

However, after the structure is completed, this thing still needs to be built.

If it cannot be produced, its actual effect is uncertain.

Of course, if you want to make things out, you also need various materials, especially those that require more rigid materials.

The displacement distance has been divided into eight points. If the material is not rigid enough, elastic deformation will occur, so a material with stronger rigidity is required.

And this kind of material, he already has, it is the material from the coder in his mind.

This material is very rigid, very suitable for use in encoders, and is very helpful for error correction.

Of course, this material also needs to be prepared first.

"Then go and see them first."

Thinking of the group of post-doctoral fellows who are still researching ceramic grinding disc materials, those post-doctoral fellows have been conducting research based on Lin Xiao's thinking, but they are getting closer to his goal, but I don't know if they have figured it out.

Then, he left the computer room and went to the material laboratory.

Seeing Lin Xiao approaching, the postdoctoral fellows shouted, "Professor Lin!"

"Ah."

Lin Xiao nodded and said, "How is the situation?"

"This furnace has the potential to succeed!"

one of them replied.

"Well! We have adjusted the centrifuge speed and the speed of adding the tantalum melt many times, and it should be successful now."

Another person also responded.

"That's fine, I'll just look forward to it."

Since they all said so, Lin Xiao decided to wait and see if they could figure it out.

In addition to this grinding disc material, there is another silicon powder and sodium hydroxide colloidal polishing fluid. Regarding the polishing fluid, Lin Xiao decided to prepare it later. There is no need to worry now, because this chemical is easier to build a production line than the material , so he planned to wait until later.

In this way, time passed quickly, and it was almost ready, and several doctoral students went immediately, closed the electric arc furnace, and took out the ceramic pieces fired inside.

After the temperature dropped, a dark gray ceramic piece appeared in front of them, and then they put it on the small polishing machine next to them to start polishing. After a while, a ceramic piece with a smooth surface, just like those modern ceramic crafts appeared in front of them.

Lin Xiao sized it up and said, "Go and measure its properties."

"it is good!"

The group of postdoctoral fellows couldn't wait to take this grinding disc to measure on various instruments.

Among them, the most important thing is that the coefficient of thermal expansion should meet their needs.

Therefore, they first took it to a thermal expansion coefficient tester for testing.

First, the room temperature is 25 degrees Celsius, and then it is slowly heated with a measuring instrument, and its expansion degree is gradually measured.

Their measuring instrument can be accurate to 10nm, that is to say, only after the expansion reaches 10nm can the display be detected.

For ultra-precision polishing discs, due to long-term friction, the working temperature may be in the hundreds of degrees Celsius, so the expansion coefficient must be very low.

However, the results of their previous experiments were not satisfactory. The thermal expansion coefficient of silicon carbide ceramics was originally 1.2-4.3, but their experimental results were only a little lower than this range.

This is obviously not enough, and it must be lower, at least lower than 0.5, to prove their success.

Ever since, everyone was staring at the indicator on the computer, waiting for its change.

During the continuous heating, the temperature of this tantalum-doped silicon carbide ceramic sheet also gradually increased, from 25 degrees Celsius to 125 degrees Celsius.

However, the indication remains unchanged!

This shows that the degree of expansion has not yet reached 10nm!

Seeing this, they all clenched their fists, looking forward to it even more.

Finally, when the temperature reached over two hundred degrees Celsius, the indicator finally jumped, and it finally expanded by 10nm!

For a moment, they couldn't contain the excitement in their hearts.

This result is much better than their previous few times!

"Li Wei, quickly calculate the coefficient of thermal expansion!"

Someone immediately shouted that based on the initial thickness and initial temperature of the ceramic sheet, they could calculate the final result.

With such a low expansion, the expansion coefficient must be lower than 1!
But the specific amount, they also want to know very much.

But at this moment, Lin Xiao said directly: "Never mind, the coefficient of expansion is 0.16."

These doctoral students were taken aback, 0.16?

Professor Lin calculated it directly in his head?

And that Li Wei said after a few seconds later: "It is indeed 0.16!"

Immediately, they all cast admiring glances at Lin Xiao, good guy, this mental calculation speed is only at the level of the strongest brain, right?

One is nanometers, the other is centimeters, and the difference between them is 1000 million.

Of course, Lin Xiao didn't feel any emotion about his calculation speed, it was just a basic operation. Compared with this result, he was really happy about it.

0.16, basically reached the value given by the system.

With such a low expansion coefficient, he can now officially announce that Huaguo will have its own top-level polishing disc, breaking the foreign monopoly!
In a few days, he called over the domestic academicians who studied polishing technology, and used this new material to translate for them what is called surprise.

Thinking of this, he smiled again, and then looked at the doctoral students in front of him again, only to see that they were all looking at him.

He couldn't help being taken aback, and asked with a smile, "Why are you looking at me? Why don't you celebrate now?"

Hearing what Lin Xiao said, these postdoctoral fellows also reacted.

Silicon carbide ceramic material with a thermal expansion coefficient of 0.16!
This is obviously the most suitable material for silicon wafer grinding discs, which means that their achievements have filled a gap for Huaguo.

This is obviously a great achievement for these doctoral students.

Although all the steps of the research were explained by Lin Xiao, they only followed the method specified by Lin Xiao to study, but since they are participants, of course they can also share certain honors.

At this time, they looked at Lin Xiao full of gratitude, and at the same time secretly rejoiced that they didn't really leave at the beginning, otherwise it would be a big loss.

Then, each of them cheered.

The laboratory is full of cheerful atmosphere.

(End of this chapter)