Intelligent Industrial Empire

Ordinary lathe guide rails, the accuracy grade is only five, and the surface roughness is 0.8.Flatness and straightness are relatively large compared to precision machine tools.

Take an ordinary machine tool as an example, the general accuracy range is: For an ordinary lathe with a machining length of one meter and a rotating diameter of 400 mm, the roughness on the guide rail surface must be above 0.8, the straightness should not exceed 0.015mm, and the flatness should not Over 0.012mm.

The longer the rail, the greater these tolerances.

Of course, for the same type of machine tool, the smaller these values ​​are, the higher the accuracy level it represents, and the more difficult it is to achieve accuracy.

On the earth, the country that produces ordinary machine tools with the highest accuracy level is not Germany with the best technology, nor the United States with the strongest strength, but Switzerland, a small European country!Of course, the ordinary machine tool with the highest production accuracy level mentioned here does not refer to the highest technical level that the entire country can achieve, but the overall manufacturing level.

Yun Fei doesn't know whether the specific facts are like this, anyway, he once realized the actual situation is like this.

Switzerland is just a small country in Europe, and its domestic industrial base is not perfect.However, their domestically produced ordinary machine tools are almost in short supply in China, where the production capacity far exceeds his.The price of a Swiss-made ordinary lathe is three times that of the highest-precision lathe made in China!

Not to mention CNC machine tools.

Excluding those most sophisticated high-end CNC machine tools that European and American countries are unwilling to, but Japan wants but dare not sell to China, in China's high-end CNC machine tool market, the first choice of domestic users is also Swiss-made CNC machine tools.Swiss CNC machine tools even surpass Germany in terms of machining accuracy and stability!However, he does not have the production capacity of Germany, so there is no way to compare with Germany in terms of quantity.

Yunfei once saw a precision ordinary lathe imported from Switzerland in the 1980s. After nearly 20 years of use, it could even produce parts with a precision of two to three μ!

Domestic ordinary lathes, small ordinary lathes, conventional lathes with a turning diameter of 250mm and 320mm360mm, the maximum speed is only two thousand revolutions, but the Swiss production can reach more than three thousand revolutions!

Anyone who does machining knows that the smaller the diameter of the processed part, the higher the linear speed required.Because the smaller the diameter of the rotating body, the smaller the linear velocity when rotating.Even if it reaches 10,000 revolutions, the linear velocity of the rotation center of the workpiece is zero.However, the farther your center point is, the higher the rotation speed and the higher the linear velocity under the same diameter.

Although the highest speed that can be reached on a domestically made ordinary lathe is two thousand revolutions or one thousand eight hundred revolutions, it cannot be used at all.Because that speed is only the design speed of the machine tool, if you really use this speed to process parts for a long time, it will not take long before the gears in the entire headstock box will be scrapped.However, this problem does not occur with Swiss products.

The reason why Yunfei wants to establish a standard that is one or half-level higher than the domestic counterparts on the machine tools produced by himself is because the Swiss cutting machine tools impressed him too much.

The smoother the machine tool guide, the smoother the cutting process during processing. In this way, the quality of the products produced will naturally be higher.

How can the accuracy level of a machine tool be reflected?It depends on the quality and precision of the parts processed by this machine!Machine tool users do not have the professional testing equipment of machine tool manufacturers.Therefore, it is very simple for them to test the accuracy of the machine tool, which is to directly install a part and perform a processing on the machine tool.

"Director Yun, you still don't stare here, or you go back to your office to drink tea, or read the newspaper, and wait for me to call you?" Yang Bingbiao tried with the special file in his hand After several times, I couldn't find the feel at all. I turned my head and saw Guderian the same. It was not in the state when he first arrived in China and repaired the guide rails of those big equipment with himself in the mountains.

"It's okay, you guys did your job, I'll watch it by the side, and it won't affect you." Yun Fei has always been curious about how the nine-level fitter can grind the guide rails by hand, especially the detection methods of the nine-level fitter.

It turned out that Yang Bingbiao and the others were repairing these equipment in the cave inside the mountain. When the machine was overhauled, he had no time to look at it.In the original world, overhauling machine tools and grinding rails were all done with rail grinders.He can't see it at all.

The equipment in their factory, if the accuracy of the machine tool drops severely, will not be overhauled at all. Instead, they will be sold directly as scrap iron to second-hand equipment and instead buy new equipment.State-owned enterprises lack everything, that is, there is no shortage of money. Many of the state's annual financial allocations are spent without a legitimate reason.The purchase of equipment is definitely an unjustified reason.

Yunfei has always wanted to see the nine-level fitter grinding the guide rails of this era. He knows that in a few years, China will hardly see the scene of manual grinding of the guide rails.The reason is that the most elite mechanical workers in China have retired, and the newly grown skilled workers have no chance to touch the most ultimate career of fitter. In addition, manual grinding of the guide rails is too inefficient.If one person grinds the rails, one rail, at least ten and a half months!

"You are here, we don't know how to work..." Yang Bingbiao directly told the truth regardless of whether he was the boss in front of him.

When Yang Bingbiao said this, Guderian also nodded.

When the boss of Yun Fei started to guard the previous procedures, the long roar of every machining procedure was heard by the entire factory.

When grinding the guide rails, you can concentrate your energy, otherwise a guide rail repaired with a file will be uneven.In the world of martial arts, the masters pay attention to the combination of a human sword, and the nine-level fitter grinds the guide rails. Just like those super masters in the world of martial arts, they also have to be one with the sword when fighting against people. Otherwise, they will not be able to Reach your highest level and overthrow the enemy.

The existence of Yun Fei made Yang Bingbiao and Guderian unable to be quiet, because Yun Fei kept asking all kinds of questions.

"Uh..." To Yang Bingbiao's words, Yun Fei was speechless.

He understood the meaning of Yang Bingbiao's words.

Here he asks questions such as whether it can achieve the second-level precision of the guide rail, how can more people reach their level, etc., and give the entire factory the highest level that can be represented by the skilled workers in China and the Soviet Union. The level of master pressure.

It is too difficult to achieve an accuracy level of more than four.

The reason why Yunfei is like this is that he wants to learn Switzerland.Because the guide rails of Swiss precision machine tools are all repaired little by little with files and oilstones!In the machine tool produced in that way, the residual internal stress in the machine bed structure is very small, and it will not affect the most important track of the machine bed with a reasonable design.Some people even use mathematical models to analyze Swiss-made machine tools when they are bored. If they are not oxidized by oxygen in the air, the machine tool guide rails will not deform more than 0.02mm even after 100 years.

"Brother Yunfei, what's wrong with you?" Ni Lishuang is now a clerk in Yunfei's office, and Yunfei's assistant is still the fourth girl of the Mao family.

Ni Lishuang's main position is in finance, but she only graduated from a technical school, and she has no practical experience in finance at all, so she worked as a clerk in Yunfei's office while studying with the finance department.

She is Yun Fei's housekeeper, and she must help Yun Fei manage the money so that her and Yun Fei's children will not go hungry in the future!

"What can he have? I want to go to the production workshop to see Master Yang and they grind the guide rails..." Mao Yadong felt very unhappy about this. The sister who grew up together pours out the reason why Yunfei is fidgeting.

"What's so good about grinding rails? It's just a few masters who are holding files and shaving them..." Ni Lishuang was really puzzled about this.

Although she doesn't understand mechanical processing, she has watched her brother Yunfei learn those things since she was a child. She doesn't think that there is much technical content in living without equipment.

And classification won't tell them, maybe it won't be long before they will never see such a scene again.

I have experienced two lifetimes, and I have never seen that this can reach the level of machining far beyond that of the most sophisticated high-end machine tools only with people and some simple tools.

Yun Fei had been fidgeting for three days. On the fourth day of work less than half an hour, he felt unable to wait any longer. He wanted to see the scene, but was worried that it would affect the work of the two of them. The two women in the office went to the ball screw factory guarded by Wang Qingfeng to see the machining center they had just shipped, and they were told that the guide rails had been ground.

Although he did not see how the nine-level fitter inspected and processed, Yun Fei was also very happy to see the results of the processing.

"You all night last night?" Yun Fei walked to the scene and discovered that not only Yang Bingbiao and Guderian, but also the other 9th-level fitters in the entire factory were all here, all with red eyes. , A look of exhaustion.

"I know that you are anxious to see the finished product. After finishing the scraping, I left the other brothers at 6 o'clock yesterday afternoon. I started to grind the surface of the machine with oilstone and sandpaper in turn. At last it barely reached the third level of accuracy..." Yang Bingbiao answered Yun Fei's words with a tired face.

"I'm going..." Yun Fei secretly let out a long breath!