The C616 renovation work lasted a total of eight days before it was finally completed.

Just when Mr. Tang and the others were gearing up to test the performance of the transformed machine tool, Guan Fei put down his work and went to do something else.

He picked a very white piece of paper, then controlled the muscles of his hands, dipped the tip of a needle in ink, and pointed out ink dots in different positions on the paper. These ink spots are very small, and the tip of the needle is quickly lifted as soon as it touches the surface of the paper, leaving only very faint ink stains, which require a lot of effort to see even with the naked eye.

The distance between the ink dots and the ink dots is also very separate and scattered, and there are only more than ten imprints on the entire 32-carat white paper.

Then he took the piece of paper and showed them one by one among the brigade and educated youth, and asked them what they saw.

Of course, 97 percent of the people didn't see anything, and those who saw it didn't look at a few ink spots, or they couldn't recognize the patterns between the ink spots.

"It's a rabbit!"

When Xie Guoping was called out by the bank leader, Guan Fei put the white paper in front of him, and by the bright sun's rays, he recognized the pattern composed of ink dots at a glance. The pattern was rough, and a dozen dots could form a fine outline, but he still recognized it.

"Good! If you touch it again, what's on it? ”

Guan Fei shouted happily and immediately took out a steel piece from his pocket. The steel block is not big, the front is ten centimeters long and wide, and three centimeters thick, and the surface is very smooth.

The first time Xie Guoping saw the steel sheet, he felt that there seemed to be some very subtle shadows on the smooth surface, but it was not easy to take it and look at it carefully, so he reached out and touched it on the steel sheet.

His fingertips touched the surface, and when he slid it slightly, he felt that there were indeed some protrusions on the surface of the steel sheet. This protrusion is not obvious, even he, he has to touch it back and forth for a while, and then he is not very sure to say: "It seems to be three lines?" The one on the right side is parallel to the edge, and the middle one is flat at first touch, but if you look closely, it should be slightly biased to the left, and I can't feel how much of the specific deviation. The left one is more crooked, and it obviously feels like it's slanted at least one degree. ”

"Very good, go to the technical school tomorrow to report, and your future position will be adjusted!" Guan Fei patted him on the shoulder with satisfaction and ordered.

"Huh?"

Xie Guoping opened his mouth wide and was very resistant to this order. He now works in a bank, he doesn't need to train, his clothes are clean all day, and he doesn't need to be exposed to the wind and sun, not to mention how comfortable. He was reluctant to let him leave his job in the bank and go to work in the factory.

I knew that I didn't care so much, I did it according to the order, and I thought I could show it in front of the brigade commander, who knew that it was for him to go down to the factory!

"It's not for you to go to the car, but to prepare to train you and a few other comrades to become fine tuners! Don't worry, it's not tired at all, it's just a little more demanding. In addition, after you go, I will give you a three-level salary increase! If you finally pass and become a trainee debugger, your salary will rise to 120 yuan! Guan Fei smiled and seduced.

After he personally did the debugging work, he felt that the requirements of this work were so high that the high-precision debugging engineer was indispensable to the precision manufacturing industry, so he immediately put down the work at hand and selected the right person from all the people for special training.

The direction of the training is to continuously strengthen their tactile sensitivity and fine visual observation ability. In addition, in order to protect their most important eyes and hands, they should also be given special skin protection, vision maintenance, and diet will be adjusted accordingly, so that they have the most delicate and sensitive fingers, as well as the most acute vision.

The usual training will also allow them to constantly observe and touch the most subtle changes, and gradually increase the difficulty to enhance their ability to recognize in this area.

In order not to overexert them and have a decrease in their sense of dullness, let them rest often.

It can be said that the cost of training a qualified and high-quality fine tuning engineer is at least dozens of times the cost of ordinary workers!

Everyone is cultivating such talents, but Guan Fei has more scientific training methods and systems, and I believe that he can quickly train his own high-level fine tuning engineers.

Under the orders of the head of the unit and the temptation of high salaries, Xie Guoping accepted the new post without much resistance.

When he arrived at the technical school, he found that there were twenty people who had been singled out with him. But there are only three people like him who are equally good at observation and touch, and the others are either super eyesight or have a keen sense of touch, all of which have only one-sided advantages.

Here, they are trained intensively according to different requirements. Every afternoon, I will also visit the technical knowledge training of other trainees to understand the structure, operation, and operation procedures of machine tools.

In addition, the technical school opened fire for their group separately from the others, and enjoyed the unprecedented treatment of the 291st brigade.

After ten days of short intensive training, they began to assemble the second CNC lathe under the guidance of Guan Fei.

It was a novel and painful experience for them.

Guan Fei's requirements are too strict, and if something goes wrong, they have to do it again. Xie Guoping has never done similar work, and all kinds of machine tool knowledge are improvised cramming, and it is frequently wrong to do it. They don't have the help of biological vicebrains, they rely on their natural eyesight and tactile sense to make judgments, which are much worse than Guan Fei, and they often feel that they are absolutely fine, but they will still be found out to be wrong and asked them to rework.

But fortunately, Guan Fei's requirements are strict, but the knowledge taught is unreserved, starting from the very basics, and letting them learn and progress little by little. And his observation is far superior to that of others, and when he feels that someone has reached the limit, he immediately lets him rest to avoid overwork, but instead degrades his own character.

So Xie Guoping: They are not physically tired, and they feel more relaxed than working in a bank.

Guan Fei taught Xie Guoping and these people, and once again ignored Mr. Tang's ardent expectations, and began to transform the heavy lathe. At the same time, he always pays attention to Xie Guoping's growth, and often gives them suggestions and make-up lessons to improve their theoretical and practical level.

"Lao Guan, you have been cold to us for almost a month, when are you going to drag this C616 to the trial processing after the transformation?"

Guan Fei was very happy to teach here, and Mr. Tang couldn't wait any longer, so they collectively found Guan Fei and strongly requested trial processing to confirm the transformation effect of C616.

Everyone had more contact, and Mr. Tang and the others also began to learn from Zhang Shengguo and others, calling Guan Fei "Lao Guan", although their youngest was seven or eight years older than Guan Fei.

"Okay, okay, let's try to improve the performance of the lathe, how about it?" Guan Fei was so entangled by them that he had no choice but to agree to go to test the car now.

"Great, I've been waiting until my hair is almost gray, and it's finally here!"

A group of people enthusiastically hugged Guan Fei and came to the first renovated C616 machine tool. Not far from it is the second lathe that Xie Guoping and they assembled, but the second is the second, which is more touching than the first one they personally participated in.

CNC lathes are classified as a branch of automatic lathes.

However, the biggest difference between it and the traditional automatic lathe is that the traditional automatic lathe relies on the time distribution shaft, shaping tool, cam, die, etc., and realizes automatic processing by mechanized means. The biggest problem with this model is that it is dedicated to the special bed, and it is difficult to change the type of processing after the lathe is set in advance for what workpiece production this lathe is used for.

CNC lathes are much more flexible than automatic lathes, and they only need to input different stroke parameters to control the lathes to carry out different processing and cut out various required workpieces.

However, it also has its own drawbacks, which is that it is quite cumbersome to model beforehand.

Mathematical control, of course, before processing, it is necessary to establish a workpiece model by mathematical means in order to accurately and quantitatively control the processing process.

Computers in this era are expensive things, not to mention the processing power is not high, and the price is extremely expensive. The data processing power required to build a model is not at all something that ordinary small and medium-sized computers can handle, and can only be computed by large-scale computers.

Therefore, unless some large manufacturing plants will have this kind of special computer, matched with high-precision automatic machining centers for production, ordinary factories do not have the economic capacity to bear such a high cost.

Computer modeling aside, it can only be done manually.

It's a tiring job, where every change in every component is represented by a mathematical model, then the machining parameters are derived, and finally programmed. Such a process, no matter how you look at it, is not easy to achieve in ordinary factories.

It's a pity that these consensuses are not applicable in front of Guan Fei.

The first work he wants to complete is to determine the coordinate system of the lathe, the CNC lathe is not an intelligent lathe, all parameters are program input, and even the coordinates of the lathe are not clear, isn't that equivalent to fooling around?

This work was carried out very quickly, and the manufacturer gave fixed coordinates before the lathe was bought. He only needs to reposition the changed coordinate system after the transformation to complete this step.

Then it's time to set the coordinates of the workpiece.

Guan Fei fixed a co-processing rod on the fixture, and then started the original manual control system of the lathe, and tried to cut the workpiece to obtain its coordinate parameters.

In the same way, the four knives were reincarnated successively, and their respective coordinates were determined.

The above is the knife setting, which is no different from manual operation.

However, after determining the various relevant parameters, the programming is nothing more than the stroke control of the rotation speed, the cutting speed, the entry and the retraction.

Guan Fei thought for a while, began to squat in front of the control panel to input the relevant parameters, and completed the input of the entire program in less than two minutes.

"That's it?"

Professor Tang crouched beside him, his eyes unblinking, looking at his entire input process, amazed at how easily he had completed the control input.

"CNC lathe control itself is actually very simple. It is speed one, speed two; Stroke parameters such as the first and second feeds only need to be expressed through mathematical formulas, and they are easy to implement......" Guan Fei said with a smile.

But the workpiece modeling is cumbersome, and that's the second half of what he didn't say.

"And what's next?" Mr. Tang and others are very studious, with a high curiosity, asking about the actual operation steps of CNC lathes that are unfamiliar to them.

"Then press the switch and it will run automatically, Donald, why don't you try it?" Guan Fei gave up the console and suggested with a smile.

"Good!"

Donald also took the lead, happily went up, took a deep breath, stretched out his thumb, and pressed the red button.

Woo......

A signal is sent from the control center of the single board computer, and the motor is energized and starts to run.

The chuck began to rotate rapidly with the workpiece, and the automatic rotary turret turned a little, stretched out the first knife, and slowly leaned up.

Snort!

The cutter swept over the surface of the workpiece, flying out a little spark, and the seemingly hard surface of the workpiece was easily cut down, quickly rewinded, and turned into a long twist, constantly swaying with the movement of the workpiece.

Sou!

The iron filings finally detach from the surface of the workpiece, splash out, and land on the machine tool. Due to the extremely high heat, the steam rises in contact with the deposited lubricating fluid.

"This is cross-sectional machining, which is the initial shaping of the workpiece." Guan Fei motioned to the onlookers to step back slightly, so as not to be burned by the iron filings.

As everyone watched eagerly, the blank was stripped of one layer and turned into a shiny steel rod.

The knife holder retreats, the turntable turns, and the second knife takes the place of the previous one, slowly moving forward again.

The iron filings flew again, but there were far fewer of them.

"This time it's finishing, and you can clearly see that the amount of stock removal has decreased. Because the center position of the tool does not necessarily coincide, the contact point where the first tool is located cannot be simply used as the positioning parameter of the subsequent tool, but it needs to be confirmed one by one before the tool setting. Guan Fei explained the focus of this link to Mr. Tang.

Mr. Tang and the others nodded again and again, staring at the workpiece processing very intently.

The two teachers also carefully took out their notebooks and recorded them in detail. The other teachers also whispered to each other.

"This processing speed is much faster, the initial processing is completed, and it immediately enters the finishing process without any pause!"

"Yes, and since there is no need to remove the workpiece and replace the lathe to set the tool again, the machining accuracy seems to be better than that of the traditional manual lathe. Brigade Commander Guan said that the machining accuracy of the transformed lathe can be improved, and I was a little skeptical at first, but now it seems that the contrast is indeed obvious! ”

Guan Fei listened to the whispered conversation of others, did not participate, but kept exchanging opinions with Mr. Tang beside him, explaining to him various problems in the processing process.

The finishing was also done quickly, and the tool holder was changed again, this time with threading of the semi-finished product. If the iron filings on the cutting surface were thick and large at the beginning, the iron filings that appear on the knife edge are much thinner, and a trace of it falls out, showing the clear threads on the steel rod.

This speed is faster, and after changing the tool again, the workpiece is cross-cut, and everything is cut in two, and a silver screw is completed.

The total time is 2 minutes and 42 seconds!

"It's too fast!"

"If other factories adopt this processing method, the work efficiency will be improved by many times, and I think it will definitely be more than seven times!"

All the teachers exclaimed, and Mr. Tang couldn't wait to shut down the machine tool and go up to observe it carefully.

After observing for a while, he picked up the prepared vernier caliper, depth vernier ruler, outer diameter micrometer, etc., and measured every subtlety of the screw from beginning to end.

Everyone else held their breath and watched him test.

During this period, Guan Fei hand-drew a workpiece processing design drawing, marking out his preset dimensional accuracy.

The workpiece was very simple, and the drawing was completed quickly, and after everyone took it and circulated it, it was handed over to Mr. Tang.

"Teacher Tang, how much is the error?" The others saw that Teacher Tang had finished measuring and asked hurriedly.

"Don't worry, I'll take a look at ......"

Mr. Tang took the drawings, carefully compared the data, then raised his head and said with a complicated expression: "The data read from the vernier caliper is compared with the data indicated in the drawing...... No errors! ”

"How is that possible?" The teachers collectively made an uproar.

They all faced Guan Fei, waiting for him to explain their doubts, no processed part can be error-free, only the size of the error.

Mr. Tang said that there was no error, and they would never believe it.

"There are still ...... errors," Guan Fei took the caliper, carefully measured it for a while, and looked up, "The minimum accuracy of the vernier caliper can only be measured to a hundred microns. The actual accuracy of this machined piece is within 100 microns of the drawing data, so it cannot be measured. I just measured it, and judging from my observations and experience, the error should be between 30 and 40 microns, which is better than I originally expected! ”

"Thirty to forty microns!"

The teachers couldn't calm down at all, when Guan Fei said that the accuracy could reach 50 microns, they already thought that they were putting satellites, and they were just listening to jokes. But the actual results were even higher than they had been designed, leaving them unable to react except to stutter.

Thirty to forty microns, isn't this higher than the processing accuracy of many precision manufacturing factories in China?