No wonder Mr. Tang is so unconfident, it is really Guan Fei who presided over the transformation of the lathe that has taken too big a step, which makes them a little worried.

Technology is always improving, and domestic enterprises also have to carry out some technological transformation from time to time, but most of the investment is only a thousand yuan. Like Guan Fei, he invested 6,000 yuan in a single machine tool at a time, which is about equivalent to a desperate gamble, and if the technical transformation is not successful, the host will have to bear important responsibilities.

Of course, Guan Fei himself is the top person in charge of the 291 Brigade, and even if the technical transformation fails, no one can hold him accountable.

But from the standpoint of Mr. Tang, this is a great achievement. The theory is very good, but in fact, no one dares to be too optimistic about whether it can be done or not.

One thing they admit is that Guan Fei's courage is indeed great.

This time, C616 changed to CNC lathe, involving several key components of the power system, conduction system, advance and retract knife system, and tool change system, which can be said to have the original C616 to be disemboweled, fully disassembled, and reassembled a new lathe after replacing new components.

The assembly of Guan Fei's first automatic return knife system opened the eyes of these theorists.

"Here's the setup of the tool change system, which is quite a delicate job that requires full attention. I have to concentrate on my work, and I can't answer everyone's questions for the time being, so please be quiet so that I can concentrate all my attention. Guan Fei said hello to everyone before starting.

Then, he ordered all the parts one by one, placed them in front of him, and then closed his eyes, as if adjusting his breathing.

Guan Fei's style also made Teacher Tang, who was watching and studying, look solemn, and involuntarily lowered his breath so as not to interfere with him.

They noticed that as Guan Fei adjusted, his breathing became more steady, and the interval between the front and back became more consistent.

After two or three minutes, Guan Fei slowly opened his eyes, and then began to assemble the pieces into a whole.

In the eyes of Mr. Tang, this process felt very slow, and each step took several minutes. And Guan Fei's body movements seem to have become quite stiff, and the speed and amplitude of his movements are like a machine, smooth and consistent!

"What a steady hand! Even machines are no different! ”

Although they did not dare to make a sound, their hearts welled up with such admiration. Affected by this, they suppressed their breathing even more, and some even covered their nostrils with their hands, as if they were afraid that a slightly larger airflow would interfere with Guan Fei's movements.

But that's a little too slow.

They think that assembly is nothing more than putting together a bunch of loose parts, and then using vernier calipers and other measuring tools to compare the assembly error and adjust it moderately.

But this is not the case with Guan Fei.

He is slow with each component he assembles, and his movements are very small. Extremely subtle adjustments have been made until the parts are put together, and once they are put together, they are left as they are as they are.

When fixing, his action of tightening the screw is also very special, not tightening one and then screwing the second, but this screw is twisted twice, and then changed to the next one and also screwed twice, several corners are evenly applied, and gradually fixed.

In the last few turns, his movements became slower and slower, sometimes one twist here, and another half turn diagonally. Or if it feels tight here, he'll relax a little bit. It was a simple fixed job, and he kept adjusting it back and forth, and it took almost ten minutes to complete.

In this process, he is always detached, and his attention is fully focused on the subtle changes in the parts in his hands, without the slightest influence from the outside world.

There are only a dozen parts, and Mr. Tang consciously makes them by himself, which is about a minute or two, and it is only five or six minutes at most.

It took half an hour to shut down the flight!

"That's it!"

Guan Fei finished the last step and carefully put the assembled knife holder aside, and the person suddenly relaxed, and the internal organs that had been stably controlled by the skin also operated autonomously in an instant, and sweat brushed the ground from the sweat glands of the head and face, like washing, and instantly flowed all over the face.

Teacher Tang and the others were stunned by his last blow, and hurriedly handed over the towel.

"Brigadier Guan, does the assembly really need such a delicate operation? Can't you just roughly install it and then make minor adjustments? A teacher asked, confused.

"Hehe, it's normal for you to think like that......"

Guan Fei took the towel, wiped the sweat on his face, and after his body relaxed, a strong feeling of fatigue surged from his heart, and he simply sat down on the ground with his feet spread apart to make his body more comfortable.

"All the teachers are engaged in mechanical teaching, and they have a lot of research on precision manufacturing. However, in actual work, the precision of the equipment is not only to see whether the parts are precise enough, but also the final assembly is the key to the actual working accuracy of the equipment. For example, the screw is crooked, which seems to be a big problem, but this line of error, after being amplified by conduction, the final action may produce an error of more than ten microns, or even tens of microns.

Screwing may seem like a small and inconspicuous action, but whether the screw is tight or loose will have a subtle effect on the fixed parts. This angular pressure is a little larger, that angular pressure is a little smaller, and it is not visible at the beginning, but after a long period of operation, the parts may be inclined to that angle under the action of pressure, thus causing the error change of the entire operating system.

Foreign countries give high salaries to high-level assembly and commissioning engineers, because assembly and commissioning are too important. The more sophisticated the equipment, the more highly qualified commissioners are needed, who are extremely important to ensure the quality of the product! ”

There is one thing he didn't say, and that is that the country is doing poorly in this area.

Does China pay attention to the final assembly and commissioning, obviously not, but the degree of attention is not enough, far from reaching the height of refinement abroad.

The same manufacturer, the same equipment, but the effect of the final assembly may be very different. A piece of equipment can reach the same type of equipment level that is no less than the best abroad, and the operation stability and reliability are not bad at all. But the other one may have problems at both ends in three days, and repeated adjustments and repairs cannot solve it.

This is that the initial assembly and debugging work is not done.

In the next part of the transformation process for C616, Mr. Tang had a more intuitive understanding of Guan Fei's fine operation level and almost demanding standard requirements.

Swish!

Guan Fei squatted next to the guide rail of the lathe, observed it back and forth for several minutes, and then tore off the pasted guide rail film.

This is also a new process that Mr. Tang only understands.

Traditionally, two rails are in direct contact, but Guan Fei asked Sun Yaohua to bring back a batch of PTFE flexible film from Hong Kong, cut it to a size slightly wider than the rail, and attach it to the rail as a buffer.

Mr. Tang's knowledge of what they taught was slightly behind the reality, and then they stayed in the countryside for a long time, and they didn't know what the meaning of this soft belt was, but they only roughly estimated this kind of wear-resistant material to ensure that the guide rail could run for a longer time without deformation.

"It's true that this soft belt is a wear-resistant material, but it's not just the reason to use it on rails. Its coefficient of friction is also much lower than that of the guide rail, only one-third of that of the cast iron guide rail, and the kinetic energy loss is small. Due to the small dynamic and static friction coefficient, it can effectively reduce the crawling during low-speed action and maintain the stability of operation. There is a soft belt buffer, and can reduce the accuracy error caused by vibration, which is equivalent to improving the machining accuracy of machine tools in disguise, so this is a good thing, foreign countries have only discovered its benefits in recent years, and began to use a large number of machine tools, precision components, and aerospace parts. If there's technology out there, why don't we use it? ”

Guan Fei explained to them the role of the rail film.

"I see, but why did you tear off the soft belt that you had pasted again? We looked very closely, and we didn't see anything wrong. Teacher Tang and the others suddenly realized, they felt that they had learned some new knowledge, and they were very excited, but they still expressed their puzzlement at Guan Fei's tearing off the soft belt.

"Hehe, because there's a bubble here! I tried it, but I couldn't get rid of it, so I had to tear it off and repaste it! Guan Fei smiled and clicked on the guide rail.

Teacher Tang and the others were relatively speechless.

When the back rails were reassembled, they couldn't read them even more. Guan Fei's requirements for every detail, in their opinion, have reached the point of harshness, in many places they widen their eyes, and they can't detect anything wrong, but Guan Fei is still tuning and tuning, and it takes a long time.

They can only comfort themselves with interlacing like a mountain, but they themselves know that this comfort is wrong. They are teachers, they have no practical experience, and Guan Fei is still a soldier, shouldn't they be even less experienced?

Perhaps, people are indeed different......

Guan Fei didn't pay much attention to their change from surprise to indifference, and his energy was all focused on the machine.

In order to see every subtle change more clearly, he had people surround the lathe with incandescent lamps to reflect every part of the lathe.

He walks slowly around the bed, his eyes glued to the rails, and the visual signals are transmitted to the brain, which is amplified by the biological subbrain to make the most refined judgments.

He felt that it was not perfectly aligned, and there should still be a little error, but he couldn't find the error when he looked at it.

What is the smallest object that can be observed by the human eye?

The public answer to this question is usually a hundred microns. But in real life, people can see every strand of hair, and the diameter of the hair is less than 100 microns. There is also silk, which is usually between 20 and 30 microns in diameter, but can also be picked out by the naked eye, which is very different from the accepted answer.

The correct answer is that the minimum observation angle of the human eye is one, then the minimum observation object is tens of microns. However, in the case of sufficient light, people only need to tilt the observation angle slightly and change the observation position, and it is possible to find things that have not been found before.

At its limit, humans can see something with a diameter of only a dozen microns, especially if it's a relatively long thing, not a dot.

This kind of observation is extremely subtle and requires very keen observation and insight, which can only be achieved after a long period of training.

Guan Fei has the help of the biological auxiliary brain, he does not need special training, as long as he improves his attention and makes correct judgments in time according to the information fed back by the biological auxiliary brain.

Since the biological subbrain said that there should be an error here, it must be that the visual light has been misaligned here when it has just passed. It's just that he didn't notice it at the time, and it passed in a flash, but now he has made up his mind, and when he looks closely, because the dislocation is too subtle, it can't be judged by the naked eye.

Unfrustrated, he repositioned the light, then walked to the end of the bed, put the rail in the center of his line of sight, and slowly moved his head.

The control of the biological auxiliary brain over the body has reached the cellular level, and it is impossible for a normal person to accurately judge the displacement data when he moves, but he can accurately determine the displacement information to one micron with the assistance of the biological auxiliary brain!

See!

As his observation position slowly changed, the line formed by the guide rail in front of him suddenly jumped from its original position to another place - there was a two-bar error in the middle!